/* ── Module Cards (homepage) ─────────────────────────── */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.35rem;
  margin: 1.75rem 0;
}
.module-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex; flex-direction: column; gap: 0.6rem;
  cursor: pointer;
}
.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
  color: var(--text-primary);
}
.module-card-icon {
  width: 44px; height: 44px;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.module-card-num {
  font-size: 0.7rem; font-weight: 700;
  color: var(--accent); text-transform: uppercase; letter-spacing: 0.07em;
}
.module-card h3 {
  font-size: 1rem; font-weight: 600; margin: 0; line-height: 1.3;
}
.module-card p {
  font-size: 0.845rem; color: var(--text-muted);
  margin: 0; line-height: 1.5;
}
.module-card-footer {
  margin-top: auto; padding-top: 0.6rem;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.mc-progress-bar {
  flex: 1; height: 4px; background: var(--bg-tertiary);
  border-radius: 2px; overflow: hidden; margin-right: 0.6rem;
}
.mc-progress-fill {
  height: 100%; background: var(--accent); border-radius: 2px;
  transition: width 0.6s ease; width: 0%;
}
.mc-pct { font-size: 0.72rem; color: var(--text-muted); white-space: nowrap; }

/* ── Hero section ────────────────────────────────────── */
.hero {
  padding: 4rem clamp(1.5rem, 2vw, 2.5rem) 3rem;
  width: min(100%, var(--home-max));
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--accent-dim); color: var(--accent);
  font-size: 0.78rem; font-weight: 600;
  padding: 0.25rem 0.8rem;
  border-radius: 20px; border: 1px solid var(--accent);
  margin-bottom: 1.25rem; letter-spacing: 0.04em;
}
.hero h1 {
  font-size: clamp(3.4rem, 5vw, 5.4rem); line-height: 1.02;
  margin-bottom: 1.1rem;
  font-family: var(--font-heading);
  max-width: 12ch;
  letter-spacing: -0.03em;
}
.hero h1 span { color: var(--accent); }
.hero-subtitle {
  font-size: clamp(1.12rem, 1.35vw, 1.35rem);
  color: var(--text-muted);
  max-width: 68ch;
  line-height: 1.65;
  margin-bottom: 2rem;
}
.hero-cta {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--accent); color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem; font-weight: 600;
  font-family: var(--font-body);
  border: none; cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
  text-decoration: none;
}
.hero-cta:hover {
  background: var(--accent-hover); color: #fff;
  transform: translateY(-2px);
}

/* ── Stats bar ───────────────────────────────────────── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.5rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 1rem 1.1rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.stat-num {
  font-size: 1.6rem; font-weight: 700;
  color: var(--text-primary); font-family: var(--font-heading);
}
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* ── Homepage sections ───────────────────────────────── */
.home-section {
  width: min(100%, var(--home-max));
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 2vw, 2.5rem) 3rem;
}
.home-section h2 {
  font-size: clamp(1.75rem, 2vw, 2.35rem);
  margin-bottom: 1.25rem;
}

.home-section > p {
  max-width: 78ch;
}

/* Study path */
.study-path {
  display: flex; flex-direction: column; gap: 0;
  margin: 1.25rem 0;
  position: relative;
}
.study-path::before {
  content: '';
  position: absolute; left: 18px; top: 0; bottom: 0;
  width: 2px; background: var(--border);
  z-index: 0;
}
.study-step {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 0.9rem 0;
  position: relative; z-index: 1;
}
.step-num {
  width: 36px; height: 36px; flex-shrink: 0;
  background: var(--bg-secondary);
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 700; color: var(--accent);
}
.step-content h4 { font-size: 0.95rem; margin: 0 0 0.2rem; font-family: var(--font-body); }
.step-content p { font-size: 0.845rem; color: var(--text-muted); margin: 0; }

/* "If I were a beginner" */
.honest-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin: 1.25rem 0;
  columns: 2 320px;
  column-gap: 2rem;
}
.honest-box p { font-size: 0.97rem; margin-bottom: 0.85rem; }
.honest-box p:last-child { margin-bottom: 0; }

/* Global progress */
.global-progress {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.25rem 0;
}
.gp-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.gp-pct { font-size: 2rem; font-weight: 700; color: var(--accent); font-family: var(--font-heading); }
.gp-label { font-size: 0.85rem; color: var(--text-muted); }
.gp-bar { height: 10px; background: var(--bg-tertiary); border-radius: 5px; overflow: hidden; margin-bottom: 0.75rem; }
.gp-fill { height: 100%; background: var(--accent); border-radius: 5px; transition: width 0.8s ease; width: 0%; }
.gp-modules { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.75rem; }
.gp-module-dot {
  font-size: 0.72rem; padding: 0.2rem 0.55rem;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all var(--transition);
}
.gp-module-dot.done { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.gp-actions { display: flex; gap: 0.5rem; align-items: center; margin-top: 0.75rem; flex-wrap: wrap; }
.gp-reset, .gp-export {
  background: none; border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 0.35rem 0.8rem;
  color: var(--text-muted); font-size: 0.8rem;
  font-family: var(--font-body);
  cursor: pointer; transition: all var(--transition);
}
.gp-reset:hover { border-color: var(--error-bdr); color: var(--error-txt); }
.gp-export:hover { border-color: var(--accent); color: var(--accent); }

/* References section */
.ref-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1.25rem 0; }
.ref-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 1rem;
  transition: border-color var(--transition), transform var(--transition);
  text-decoration: none;
}
.ref-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.ref-card-name { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.25rem; }
.ref-card-desc { font-size: 0.8rem; color: var(--text-muted); }

.study-goals-grid,
.learning-dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 0;
}

.study-goal-card,
.dashboard-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
}

.study-goal-kicker,
.dashboard-kicker {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.45rem;
  font-weight: 700;
}

.study-goal-card h3,
.dashboard-card h3 {
  font-size: 1rem;
  margin: 0 0 0.55rem;
}

.study-goal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.study-goal-tags span {
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  font-size: 0.74rem;
  color: var(--text-secondary);
}

.study-goal-next {
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--border);
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.dashboard-list {
  list-style: none;
  padding: 0;
  margin: 0.85rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.dashboard-list li {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}

.dashboard-list span {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.dashboard-link {
  display: inline-flex;
  margin-top: 0.7rem;
  font-weight: 600;
}

.goal-progress-meta {
  margin-top: 0.85rem;
}

.goal-progress-top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.goal-progress-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 0.45rem;
}

.goal-progress-fill {
  height: 100%;
  background: var(--accent);
}

.goal-progress-copy {
  margin-top: 0.45rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.review-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.review-card.ok { border-color: rgba(34,197,94,0.35); }
.review-card.warn { border-color: rgba(245,158,11,0.35); }
.review-card.wide { grid-column: 1 / -1; }

.review-empty,
.sim-history-empty {
  color: var(--text-muted);
}

.review-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.dashboard-list.compact { gap: 0.4rem; }

.ops-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
  margin-top: 1rem;
}

.ops-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}

.ops-kicker {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.45rem;
  font-weight: 700;
}

.ops-card ul {
  margin: 0;
  padding-left: 1rem;
}

@media (min-width: 1100px) {
  .hero {
    padding-top: 4.8rem;
    padding-bottom: 3.4rem;
    padding-right: clamp(2rem, 2.4vw, 3rem);
  }

  .module-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  #ferramentas .module-grid {
    grid-template-columns: repeat(3, minmax(260px, 1fr));
  }

  .global-progress,
  .honest-box {
    max-width: none;
  }
}

@media (min-width: 1400px) {
  .hero,
  .home-section {
    padding-left: clamp(2rem, 2.4vw, 3rem);
    padding-right: clamp(2.4rem, 2.8vw, 3.4rem);
  }

  .module-grid {
    grid-template-columns: repeat(4, minmax(300px, 1fr));
    gap: 1.5rem;
  }

  .module-card {
    min-height: 238px;
  }
}

/* ── Flashcards ──────────────────────────────────────── */
.flashcard-section {
  margin: 2rem 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.fc-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem;
}
.fc-header h3 { font-size: 1rem; margin: 0; }
.fc-counter { font-size: 0.82rem; color: var(--text-muted); }

.fc-viewport {
  perspective: 1000px;
  margin-bottom: 1.25rem;
}
.fc-card {
  width: 100%; min-height: 160px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.55s ease;
  cursor: pointer;
}
.fc-card.flipped { transform: rotateY(180deg); }

.fc-front, .fc-back {
  position: absolute; width: 100%; min-height: 160px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-sm);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 1.5rem;
  text-align: center;
  border: 2px solid var(--border);
}
.fc-front {
  background: var(--bg-tertiary);
  border-color: var(--accent);
}
.fc-back {
  background: var(--analogy-bg);
  border-color: var(--analogy-bdr);
  transform: rotateY(180deg);
}
.fc-hint {
  font-size: 0.72rem; color: var(--text-muted);
  margin-bottom: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.fc-question { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); line-height: 1.4; }
.fc-answer { font-size: 0.95rem; color: var(--analogy-txt); line-height: 1.5; }

.fc-controls {
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
}
.fc-btn {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.45rem 1rem; cursor: pointer;
  color: var(--text-secondary); font-size: 0.875rem;
  font-family: var(--font-body);
  transition: all var(--transition);
}
.fc-btn:hover { border-color: var(--accent); color: var(--accent); }
.fc-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.fc-shuffle {
  background: var(--accent-dim); border-color: var(--accent); color: var(--accent);
}

/* ── Quiz ────────────────────────────────────────────── */
.quiz-section {
  margin: 2rem 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.quiz-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
.quiz-header h3 { font-size: 1rem; margin: 0; }
.quiz-score-badge {
  font-size: 0.78rem; padding: 0.2rem 0.6rem;
  background: var(--accent-dim); color: var(--accent);
  border-radius: var(--radius-xs); font-weight: 600;
  display: none;
}

.quiz-question { display: none; }
.quiz-question.active { display: block; animation: fadeIn 0.3s ease; }

.quiz-q-num { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.5rem; text-transform: uppercase; letter-spacing: 0.05em; }
.quiz-q-text { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 1.1rem; line-height: 1.45; }

.quiz-options { display: flex; flex-direction: column; gap: 0.55rem; }
.quiz-opt {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  cursor: pointer;
  font-size: 0.9rem; color: var(--text-secondary);
  font-family: var(--font-body);
  text-align: left;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 0.65rem;
}
.quiz-opt:hover { border-color: var(--accent); color: var(--text-primary); background: var(--accent-dim); }
.quiz-opt.correct { border-color: var(--example-bdr); background: var(--example-bg); color: var(--example-txt); }
.quiz-opt.wrong   { border-color: var(--error-bdr);   background: var(--error-bg);   color: var(--error-txt);   }
.quiz-opt.disabled { cursor: default; pointer-events: none; }
.quiz-opt-letter {
  width: 24px; height: 24px; flex-shrink: 0;
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700;
  transition: all var(--transition);
}
.quiz-opt.correct .quiz-opt-letter { background: var(--example-bdr); border-color: var(--example-bdr); color: #fff; }
.quiz-opt.wrong   .quiz-opt-letter { background: var(--error-bdr);   border-color: var(--error-bdr);   color: #fff; }

.quiz-feedback {
  margin-top: 1rem; padding: 0.85rem 1.1rem;
  border-radius: var(--radius-sm); font-size: 0.875rem;
  display: none;
}
.quiz-feedback.show { display: block; animation: fadeIn 0.3s ease; }
.quiz-feedback.correct-fb { background: var(--example-bg); border: 1px solid var(--example-bdr); color: var(--example-txt); }
.quiz-feedback.wrong-fb   { background: var(--error-bg);   border: 1px solid var(--error-bdr);   color: var(--error-txt);   }

.quiz-nav { margin-top: 1.1rem; display: flex; justify-content: space-between; align-items: center; }
.quiz-next-btn {
  background: var(--accent); color: #fff; border: none;
  border-radius: var(--radius-sm); padding: 0.5rem 1.2rem;
  cursor: pointer; font-size: 0.875rem; font-family: var(--font-body);
  font-weight: 500; transition: background-color var(--transition);
  display: none;
}
.quiz-next-btn.show { display: block; }
.quiz-next-btn:hover { background: var(--accent-hover); }

.quiz-result { display: none; text-align: center; padding: 1.5rem 1rem; animation: fadeIn 0.4s ease; }
.quiz-result.show { display: block; }
.quiz-result-score {
  font-size: 3rem; font-weight: 700; color: var(--accent);
  font-family: var(--font-heading); margin-bottom: 0.5rem;
}
.quiz-result-msg { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 1.25rem; }
.quiz-retry {
  background: var(--accent-dim); color: var(--accent); border: 1px solid var(--accent);
  border-radius: var(--radius-sm); padding: 0.5rem 1.25rem;
  cursor: pointer; font-size: 0.875rem; font-family: var(--font-body); font-weight: 500;
  transition: all var(--transition);
}
.quiz-retry:hover { background: var(--accent); color: #fff; }

/* ── Visual Diagrams ─────────────────────────────────── */

/* NAT Diagram */
.diagram-nat {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; margin: 1.25rem 0;
  overflow-x: auto;
}
.diagram-nat h4 { text-align: center; margin-bottom: 1.25rem; font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0; }
.nat-row { display: flex; align-items: center; justify-content: center; gap: 0; flex-wrap: nowrap; min-width: 480px; }
.nat-box {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.75rem 1rem;
  text-align: center; flex-shrink: 0;
}
.nat-box-title { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.3rem; }
.nat-box-ip { font-size: 0.8rem; font-weight: 600; color: var(--accent); font-family: monospace; }
.nat-host { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.2rem; }
.nat-hosts-col { display: flex; flex-direction: column; gap: 0.4rem; }
.nat-arrow {
  padding: 0 0.75rem; color: var(--accent);
  font-size: 1.1rem; flex-shrink: 0; white-space: nowrap;
}
.nat-router {
  background: var(--accent-dim); border-color: var(--accent);
}
.nat-router .nat-box-ip { color: var(--text-primary); font-size: 0.72rem; }
.nat-internet {
  background: var(--summary-bg); border-color: var(--summary-bdr);
}
.nat-internet .nat-box-ip { color: var(--summary-txt); }

/* Three-way handshake */
.diagram-handshake {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; margin: 1.25rem 0;
}
.diagram-handshake h4 { text-align: center; margin-bottom: 1.5rem; font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0; }
.hs-actors { display: flex; justify-content: space-between; margin-bottom: 1rem; }
.hs-actor { text-align: center; font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }
.hs-steps { display: flex; flex-direction: column; gap: 0.75rem; position: relative; }
.hs-step {
  display: flex; align-items: center;
  padding: 0.6rem 1rem;
  background: var(--bg-tertiary); border-radius: var(--radius-sm);
  border: 1px solid var(--border); gap: 0.75rem;
}
.hs-step-num {
  width: 26px; height: 26px; flex-shrink: 0;
  background: var(--accent); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; color: #fff;
}
.hs-msg { flex: 1; }
.hs-label { font-size: 0.875rem; font-weight: 600; color: var(--accent); }
.hs-desc { font-size: 0.8rem; color: var(--text-muted); }
.hs-dir { font-size: 1.1rem; color: var(--text-muted); flex-shrink: 0; }

/* Access timeline */
.timeline-access {
  margin: 1.5rem 0;
}
.ta-step {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 0.9rem 0; position: relative;
}
.ta-step:not(:last-child)::after {
  content: ''; position: absolute;
  left: 18px; top: 38px; bottom: -12px;
  width: 2px; background: var(--border);
}
.ta-num {
  width: 36px; height: 36px; flex-shrink: 0;
  background: var(--bg-secondary); border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; color: var(--accent);
  z-index: 1;
}
.ta-content { flex: 1; padding-top: 0.15rem; }
.ta-title { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.25rem; }
.ta-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }
.ta-detail {
  font-size: 0.8rem; color: var(--accent);
  background: var(--accent-dim); border-radius: var(--radius-xs);
  padding: 0.25rem 0.6rem; display: inline-block; margin-top: 0.3rem;
  font-family: monospace;
}

/* OSI Table */
.osi-table {
  margin: 1.25rem 0; overflow-x: auto;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.osi-table table { width: 100%; border-collapse: collapse; min-width: 500px; }
.osi-table th { background: var(--bg-tertiary); color: var(--text-primary); font-weight: 600; padding: 0.65rem 0.9rem; border-bottom: 1px solid var(--border); font-size: 0.85rem; }
.osi-table td { padding: 0.55rem 0.9rem; border-bottom: 1px solid var(--border-subtle); font-size: 0.85rem; vertical-align: top; }
.osi-table tr:last-child td { border-bottom: none; }
.layer-app    { background: rgba(79,142,247,0.08); }
.layer-pres   { background: rgba(139,92,246,0.08); }
.layer-sess   { background: rgba(236,72,153,0.08); }
.layer-trans  { background: rgba(16,185,129,0.08); }
.layer-net    { background: rgba(245,158,11,0.08); }
.layer-data   { background: rgba(239,68,68,0.08); }
.layer-phys   { background: rgba(107,114,128,0.08); }
.layer-badge {
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  padding: 0.1rem 0.45rem; border-radius: 3px;
}

/* Troubleshooting Flowchart */
.flowchart {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; margin: 1.25rem 0;
  overflow-x: auto;
}
.flowchart h4 { text-align: center; margin-bottom: 1.25rem; font-size: 0.85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0; }
.fc-node {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.6rem 1rem;
  text-align: center; font-size: 0.875rem; color: var(--text-primary);
  display: inline-block;
}
.fc-decision {
  background: var(--memorize-bg); border-color: var(--memorize-bdr);
  color: var(--memorize-txt);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  padding: 1.1rem 2rem;
  min-width: 160px;
}
.fc-ok    { background: var(--example-bg);  border-color: var(--example-bdr);  color: var(--example-txt);  }
.fc-fail  { background: var(--error-bg);    border-color: var(--error-bdr);    color: var(--error-txt);    }
.fc-arrow { text-align: center; color: var(--text-muted); font-size: 1.2rem; line-height: 1.5; }
.fc-row   { display: flex; align-items: center; justify-content: center; gap: 0.75rem; margin: 0.35rem 0; }
.fc-label { font-size: 0.72rem; color: var(--text-muted); margin: 0 0.25rem; }
.fc-col   { display: flex; flex-direction: column; align-items: center; }

/* Port table */
.port-table td:first-child { font-weight: 700; color: var(--accent); font-family: monospace; }
.port-table td:nth-child(2) { color: var(--text-primary); font-weight: 500; }
.port-critical { border-left: 3px solid var(--error-bdr); }
.port-secure   { border-left: 3px solid var(--example-bdr); }
.port-common   { border-left: 3px solid var(--accent); }

/* ── Favorites page ──────────────────────────────────── */
.fav-empty {
  text-align: center; padding: 3rem 1rem;
  color: var(--text-muted);
}
.fav-empty-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.fav-list { display: flex; flex-direction: column; gap: 0.65rem; margin: 1.25rem 0; }
.fav-item {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.85rem 1.1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.fav-item-info { flex: 1; }
.fav-item-title { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
.fav-item-path { font-size: 0.78rem; color: var(--text-muted); }
.fav-item-remove {
  background: none; border: 1px solid var(--border);
  border-radius: var(--radius-xs); padding: 0.25rem 0.5rem;
  cursor: pointer; color: var(--text-muted); font-size: 0.8rem;
  font-family: var(--font-body); transition: all var(--transition);
}
.fav-item-remove:hover { border-color: var(--error-bdr); color: var(--error-txt); }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {
  .hero { padding: 2.5rem 1.25rem 2rem; }
  .hero h1 { font-size: 2.1rem; }
  .home-section { padding: 0 1.25rem 2.5rem; }
  .module-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .nat-row { min-width: 360px; }
  .fc-decision { padding: 0.75rem 1.25rem; min-width: 120px; }
  .stats-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
  .honest-box { columns: 1; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.75rem; }
  .module-grid { grid-template-columns: 1fr 1fr; }
  .ref-grid { grid-template-columns: 1fr 1fr; }
  .stats-bar { grid-template-columns: 1fr; }
}

/* ── Subnet Calculator ───────────────────────────────── */
.subnet-calc {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.subnet-calc h3 { margin: 0 0 1rem; font-size: 1rem; }
.sc-form { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1rem; }
.sc-input {
  flex: 1; min-width: 200px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.9rem;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
}
.sc-input:focus { border-color: var(--accent); }
.sc-input::placeholder { color: var(--text-muted); font-size: 0.875rem; }
.sc-btn {
  background: var(--accent); color: #fff;
  border: none; border-radius: var(--radius-sm);
  padding: 0.6rem 1.25rem;
  cursor: pointer; font-family: var(--font-body);
  font-size: 0.9rem; font-weight: 500;
  transition: background-color var(--transition);
}
.sc-btn:hover { background: var(--accent-hover); }

.subnet-output, #subnetOutput { display: none; }
.subnet-output.visible, #subnetOutput.visible { display: block; animation: fadeIn 0.3s ease; }
.sc-result-grid { display: flex; flex-direction: column; gap: 0; }
.sc-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  gap: 1rem;
}
.sc-row:last-child { border-bottom: none; }
.sc-row.sc-highlight { background: var(--accent-dim); border-radius: var(--radius-xs); }
.sc-label { font-size: 0.82rem; color: var(--text-muted); white-space: nowrap; }
.sc-val { font-size: 0.9rem; color: var(--text-primary); text-align: right; }
.sc-val.mono { font-family: 'Courier New', monospace; letter-spacing: 0.03em; }
.sc-val.small { font-size: 0.78rem; }
.sc-error {
  padding: 0.75rem 1rem;
  background: var(--error-bg); border: 1px solid var(--error-bdr);
  color: var(--error-txt); border-radius: var(--radius-sm);
  font-size: 0.875rem;
}
.bin-net  { color: var(--accent); font-weight: 700; }
.bin-host { color: var(--text-muted); }
.sc-legend { margin-top: 0.65rem; font-size: 0.75rem; color: var(--text-muted); }

/* ── Interactive OSI Diagram ─────────────────────────── */
.osi-interactive {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}
@media (max-width: 640px) { .osi-interactive { grid-template-columns: 1fr; } }

.osi-layers-list { display: flex; flex-direction: column; gap: 3px; }

.osi-layer-btn {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  background: var(--bg-secondary);
  text-align: left;
  width: 100%;
  font-family: var(--font-body);
}
.osi-layer-btn:hover { border-color: var(--border); background: var(--bg-tertiary); }
.osi-layer-btn.active { border-color: var(--layer-color, var(--accent)); background: var(--bg-tertiary); }
.osi-layer-btn.active .olb-num { background: var(--layer-color, var(--accent)); color: #fff; }

.olb-num {
  width: 28px; height: 28px; flex-shrink: 0;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--layer-color, var(--text-muted));
  border: 1px solid var(--layer-color, var(--border));
  transition: all var(--transition);
}
.olb-name { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }
.olb-proto { font-size: 0.72rem; color: var(--text-muted); margin-left: auto; flex-shrink: 0; }

.osi-detail-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  min-height: 240px;
  display: flex; flex-direction: column; justify-content: center;
  transition: border-color var(--transition);
}
.osi-detail-panel.has-content { justify-content: flex-start; }
.osi-placeholder {
  text-align: center; color: var(--text-muted);
  font-size: 0.9rem; padding: 1rem;
}
.osi-detail-num {
  font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}
.osi-detail-name { font-size: 1.25rem; font-weight: 700; font-family: var(--font-heading); margin-bottom: 0.75rem; }
.osi-detail-desc { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.75rem; line-height: 1.6; }
.osi-detail-row { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.6rem; }
.osi-detail-badge {
  font-size: 0.72rem; padding: 0.18rem 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
}
.osi-detail-analogy {
  font-size: 0.82rem; color: var(--analogy-txt);
  background: var(--analogy-bg); border-radius: var(--radius-xs);
  padding: 0.5rem 0.75rem; margin-top: 0.5rem;
  border-left: 3px solid var(--analogy-bdr);
}

/* ── Simulado ────────────────────────────────────────── */
.simulado-header {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.sim-info { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.sim-stat { text-align: center; }
.sim-stat-num { font-size: 1.4rem; font-weight: 700; color: var(--accent); font-family: var(--font-heading); }
.sim-stat-label { font-size: 0.72rem; color: var(--text-muted); }

.timer-display {
  font-size: 1.5rem; font-weight: 700; font-family: monospace;
  color: var(--accent); min-width: 60px; text-align: center;
}
.timer-display.warning { color: var(--error-txt); animation: pulse 1s ease infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }

.sim-progress-bar { height: 6px; background: var(--bg-tertiary); border-radius: 3px; overflow: hidden; margin-top: 1rem; }
.sim-progress-fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width 0.3s ease; width: 0%; }

.sim-question-wrap { animation: fadeInUp 0.3s ease; }
.sim-q-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.75rem;
}
.sim-q-tema {
  font-size: 0.72rem; font-weight: 600;
  background: var(--accent-dim); color: var(--accent);
  padding: 0.18rem 0.55rem; border-radius: var(--radius-xs);
  text-transform: uppercase; letter-spacing: 0.05em;
}
.sim-q-num { font-size: 0.75rem; color: var(--text-muted); }

.sim-mode-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  align-items: end;
}

.sim-mode-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 180px;
}

.sim-mode-field span {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.sim-mode-field select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-body);
}

.sim-result {
  display: none; text-align: center; padding: 2rem 1rem;
  animation: fadeIn 0.4s ease;
}
.sim-result.show { display: block; }
.sim-result-score {
  font-size: 3.5rem; font-weight: 700;
  font-family: var(--font-heading); color: var(--accent);
  margin-bottom: 0.5rem;
}
.sim-breakdown {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem; margin: 1.5rem 0; text-align: left;
}
.sim-bd-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
}
.sim-bd-tema { font-size: 0.72rem; color: var(--text-muted); margin-bottom: 0.3rem; }
.sim-bd-score { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }

.sim-recommendations {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  margin: 1rem 0 0;
  text-align: left;
}

.sim-rec-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.95rem;
}

.sim-bd-link {
  display: inline-flex;
  margin-top: 0.45rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.sim-history-panel {
  margin: 1rem 0 1.2rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
}

.sim-history-chart {
  display: flex;
  align-items: end;
  gap: 0.6rem;
  min-height: 120px;
}

.sim-history-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  min-width: 36px;
}

.sim-history-bar {
  width: 24px;
  border-radius: 10px 10px 0 0;
  background: linear-gradient(180deg, var(--accent), rgba(79,142,247,0.45));
}

.sim-history-item span,
.sim-history-copy {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ── Exercícios práticos ─────────────────────────────── */
.exercise-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  overflow: hidden;
}
.ex-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.9rem 1.25rem;
  cursor: pointer;
  transition: background-color var(--transition);
}
.ex-header:hover { background: var(--bg-tertiary); }
.ex-title { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
.ex-tags { display: flex; gap: 0.35rem; }
.ex-tag {
  font-size: 0.7rem; padding: 0.15rem 0.45rem;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary); border: 1px solid var(--border);
  color: var(--text-muted);
}
.ex-tag.win { border-color: #3b82f6; color: #3b82f6; background: rgba(59,130,246,0.1); }
.ex-tag.linux { border-color: #f59e0b; color: #f59e0b; background: rgba(245,158,11,0.1); }
.ex-body { display: none; padding: 0 1.25rem 1.25rem; }
.ex-body.open { display: block; animation: fadeInUp 0.2s ease; }
.ex-objective { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 1rem; }
.ex-cmd { margin-bottom: 0.75rem; }
.ex-cmd-label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.3rem; }
.exercise-reasoning {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  margin: 0.9rem 0 1rem;
}

.exercise-reasoning-block {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.85rem;
}

.exercise-reasoning-block strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.78rem;
}

.exercise-response-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
  grid-column: 1 / -1;
}

.exercise-response-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.exercise-response-field span {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.exercise-response-field textarea {
  width: 100%;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
  font-family: var(--font-body);
  resize: vertical;
}

.exercise-actions-row {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
}

.exercise-save-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.8rem;
  font-family: var(--font-body);
  cursor: pointer;
}

.exercise-save-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.exercise-status-btn {
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.8rem;
  font-family: var(--font-body);
  cursor: pointer;
}

.exercise-status-btn.done {
  background: rgba(34,197,94,0.12);
  border-color: #22c55e;
  color: #22c55e;
}
.ex-solution {
  display: none; margin-top: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--example-bg); border: 1px solid var(--example-bdr);
  border-radius: var(--radius-sm);
  font-size: 0.875rem; color: var(--example-txt);
}
.ex-solution.show { display: block; animation: fadeIn 0.2s ease; }
.ex-show-btn {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.35rem 0.85rem;
  cursor: pointer; font-size: 0.8rem; color: var(--text-muted);
  font-family: var(--font-body); transition: all var(--transition);
  margin-top: 0.5rem;
}
.ex-show-btn:hover { border-color: var(--example-bdr); color: var(--example-txt); }
.ex-module-link {
  display: inline-block; margin-top: 0.75rem; font-size: 0.8rem;
  color: var(--accent); text-decoration: none; transition: opacity var(--transition);
}
.ex-module-link:hover { opacity: 0.75; text-decoration: underline; }

/* ════════════════════════════════════════════════════════
   DNS REAL PANEL
════════════════════════════════════════════════════════ */
.dns-real-panel { margin-top: 1rem; border: 1px solid var(--border); border-radius: var(--radius); overflow: visible; }
.dns-real-header { display: flex; align-items: center; justify-content: space-between; padding: 0.55rem 1rem; background: var(--bg-secondary); border-bottom: 1px solid var(--border); border-radius: var(--radius) var(--radius) 0 0; }
.dns-real-title { font-size: 0.82rem; font-weight: 700; color: var(--text-primary); }
.dns-real-timing { font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent); }
.dns-rr-block { border-bottom: 1px solid var(--border); }
.dns-rr-block:last-child { border-bottom: none; }
.dns-rr-summary { display: flex; align-items: center; justify-content: space-between; padding: 0.45rem 1rem; cursor: pointer; font-size: 0.8rem; font-weight: 600; color: var(--text-primary); list-style: none; background: var(--bg-secondary); user-select: none; }
.dns-rr-summary::-webkit-details-marker { display: none; }
.dns-rr-summary:hover { background: var(--bg-tertiary); }
.dns-rr-tip { cursor: help; font-size: 0.7rem; opacity: 0.55; flex-shrink: 0; }
.dns-rr-body { padding: 0.4rem 1rem 0.5rem; }
.dns-rr-row { display: flex; align-items: baseline; justify-content: space-between; gap: 0.75rem; padding: 0.2rem 0; font-size: 0.79rem; border-bottom: 1px solid rgba(255,255,255,0.03); }
.dns-rr-row:last-child { border-bottom: none; }
.dns-rr-row code { font-family: var(--font-mono); color: var(--accent); word-break: break-all; }
.dns-rr-ttl { font-size: 0.7rem; color: var(--text-muted); white-space: nowrap; flex-shrink: 0; }
.dns-rr-empty { font-size: 0.79rem; color: var(--text-muted); padding: 0.15rem 0; }
.dns-rr-loading { padding: 0.65rem 1rem; font-size: 0.8rem; color: var(--text-muted); }

/* ════════════════════════════════════════════════════════
   HTTP INSPECTOR
════════════════════════════════════════════════════════ */
.http-inspector { margin-top: 1.5rem; border-top: 2px solid var(--border); padding-top: 1.25rem; }
.http-insp-header { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.3rem; }
.http-insp-desc { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.75rem; }
.http-insp-row { display: flex; gap: 0.5rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
.http-insp-row .lab-input { flex: 1; min-width: 200px; }
.http-insp-loading { font-size: 0.8rem; color: var(--text-muted); padding: 0.4rem 0; }
.http-insp-error { font-size: 0.82rem; color: var(--error-txt, #f87171); padding: 0.4rem 0; }
.http-insp-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.65rem; flex-wrap: wrap; }
.http-insp-status { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 700; }
.http-insp-time { font-size: 0.77rem; color: var(--text-muted); font-family: var(--font-mono); }
.http-insp-cors-badge { font-size: 0.7rem; background: rgba(251,191,36,0.1); border: 1px solid rgba(251,191,36,0.3); color: #fbbf24; border-radius: 999px; padding: 0.1rem 0.5rem; cursor: help; }
.http-insp-cors-note { font-size: 0.79rem; color: var(--text-secondary); background: var(--bg-secondary); border: 1px solid var(--border); border-left: 3px solid #fbbf24; border-radius: var(--radius-xs); padding: 0.55rem 0.8rem; margin-bottom: 0.75rem; line-height: 1.5; }
.http-insp-no-hdr { font-size: 0.8rem; color: var(--text-muted); }
.http-cat-block { margin-bottom: 1rem; }
.http-cat-title { font-size: 0.72rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.35rem; }
.http-hdr-row { display: flex; align-items: flex-start; gap: 0.4rem; padding: 0.18rem 0; font-size: 0.79rem; border-bottom: 1px solid rgba(255,255,255,0.03); }
.http-hdr-row:last-child { border-bottom: none; }
.http-hdr-key { font-family: var(--font-mono); color: var(--accent); white-space: nowrap; min-width: 160px; max-width: 200px; flex-shrink: 0; word-break: break-all; }
.http-hdr-val { color: var(--text-secondary); word-break: break-all; flex: 1; }
.http-hdr-hint { cursor: help; font-size: 0.7rem; opacity: 0.55; flex-shrink: 0; margin-top: 0.05rem; }

/* ════════════════════════════════════════════════════════
   CHEAT SHEET — BUSCA, COPIAR, GLOSSÁRIO
════════════════════════════════════════════════════════ */
.cs-search-wrap { margin-bottom: 1.5rem; }
.cs-search { width: 100%; padding: 0.6rem 1rem; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); color: var(--text-primary); font-size: 0.9rem; font-family: var(--font-body); box-sizing: border-box; transition: border-color var(--transition); }
.cs-search:focus { outline: none; border-color: var(--accent); }
.cs-hidden { display: none !important; }
.cs-no-results { text-align: center; color: var(--text-muted); padding: 2rem 0; font-size: 0.9rem; }
.cs-copy-btn { float: right; margin-left: 0.5rem; appearance: none; background: none; border: 1px solid var(--border); border-radius: var(--radius-xs); color: var(--text-muted); font-size: 0.7rem; padding: 0.15rem 0.45rem; cursor: pointer; transition: all var(--transition); font-family: var(--font-body); }
.cs-copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.cs-status-2xx td:first-child { color: #4ade80; font-weight: 600; }
.cs-status-3xx td:first-child { color: #fbbf24; font-weight: 600; }
.cs-status-4xx td:first-child { color: #f87171; font-weight: 600; }
.cs-status-5xx td:first-child { color: #fb7185; font-weight: 600; }
.cs-glossary-nav { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 1rem; }
.cs-glossary-nav a { display: inline-block; padding: 0.15rem 0.45rem; border-radius: var(--radius-xs); background: var(--bg-secondary); border: 1px solid var(--border); font-size: 0.75rem; color: var(--text-secondary); text-decoration: none; transition: all var(--transition); }
.cs-glossary-nav a:hover { border-color: var(--accent); color: var(--accent); }
.cs-glossary-letter { font-size: 1.05rem; font-weight: 700; color: var(--accent); margin: 1.5rem 0 0.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.2rem; }
.cs-glossary-letter:first-child { margin-top: 0; }
.cs-glossary-term { margin-bottom: 0.6rem; padding: 0.6rem 0.85rem; background: var(--bg-secondary); border-radius: var(--radius-xs); border: 1px solid var(--border); }
.cs-glossary-term-title { font-size: 0.84rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.2rem; }
.cs-glossary-term-def { font-size: 0.79rem; color: var(--text-secondary); line-height: 1.55; }

/* ════════════════════════════════════════════════════════
   LABORATÓRIO INTERATIVO
════════════════════════════════════════════════════════ */

/* ── Page layout ─────────────────────────────────────── */
.lab-main { padding: 1.5rem 2rem 4rem; width: 100%; }
.lab-page-header { margin-bottom: 1.5rem; }
.lab-page-title { font-size: 1.8rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.4rem; }
.lab-page-desc { color: var(--text-muted); font-size: 0.9rem; }

/* ── Tabs ─────────────────────────────────────────────── */
.lab-tabs-shell {
  position: relative; display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.lab-tabs {
  display: flex; gap: 0.4rem; overflow-x: auto; overflow-y: hidden;
  padding-bottom: 0.25rem; scroll-behavior: smooth; scrollbar-width: none;
  flex: 1; min-width: 0;
}
.lab-tabs::-webkit-scrollbar { display: none; }
.lab-tabs-nav {
  flex: 0 0 auto; width: 34px; height: 34px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-secondary); color: var(--text-secondary);
  cursor: pointer; transition: all var(--transition);
}
.lab-tabs-nav:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.lab-tabs-nav[hidden] { display: none; }
.lab-tab {
  flex-shrink: 0;
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.45rem 0.9rem;
  font-size: 0.8rem; font-family: var(--font-body); color: var(--text-secondary);
  cursor: pointer; white-space: nowrap; transition: all var(--transition);
}
.lab-tab:hover { border-color: var(--accent); color: var(--accent); }
.lab-tab.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); font-weight: 600; }
@media (max-width: 700px) {
  .lab-tabs-shell { gap: 0.35rem; }
  .lab-tabs-nav { width: 30px; height: 30px; }
}

/* ── Panels ───────────────────────────────────────────── */
.lab-panels { position: relative; }
.lab-panel { display: none; }
.lab-panel.active { display: block; }
.lab-panel-intro { margin-bottom: 1.25rem; }
.lab-panel-intro h2 { font-size: 1.25rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.3rem; }
.lab-panel-intro p { color: var(--text-muted); font-size: 0.88rem; }

/* ── Shared lab controls ──────────────────────────────── */
.btn-lab {
  background: var(--accent); border: none; border-radius: var(--radius-xs);
  color: #fff; padding: 0.45rem 1rem; font-size: 0.82rem; font-family: var(--font-body);
  cursor: pointer; transition: background var(--transition);
}
.btn-lab:hover { background: var(--accent-hover); }
.btn-lab:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-lab--ghost { background: var(--bg-secondary); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-lab--ghost:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-lab--sm { font-size: 0.75rem; padding: 0.3rem 0.7rem; }
.btn-lab--icon { background: var(--bg-tertiary); border: 1px solid var(--border); color: var(--text-muted); border-radius: var(--radius-xs); padding: 0.2rem 0.5rem; cursor: pointer; font-size: 0.75rem; }
.lab-input {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-primary); padding: 0.35rem 0.6rem; font-family: var(--font-mono); font-size: 0.82rem;
  transition: border-color var(--transition); min-width: 0;
}
.lab-input:focus { outline: none; border-color: var(--accent); }
.lab-input--error { border-color: var(--error-bdr) !important; }
.lab-select {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-primary); padding: 0.35rem 0.5rem; font-family: var(--font-body); font-size: 0.82rem;
}
.lab-textarea {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-primary); padding: 0.4rem 0.6rem; font-family: var(--font-mono); font-size: 0.8rem;
  resize: vertical; width: 100%;
}
.lab-textarea:focus { outline: none; border-color: var(--accent); }

/* ════════════════════════════════════════════════════════
   1. PACKET JOURNEY
════════════════════════════════════════════════════════ */
.pkt-stage {
  position: relative; background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem 1rem 1rem; margin-bottom: 1rem;
  min-height: 110px;
}
.pkt-nodes { display: flex; justify-content: space-between; align-items: flex-end; gap: 0; }
.pkt-node {
  display: flex; flex-direction: column; align-items: center; gap: 0.3rem;
  flex: 1; opacity: 0.4; transition: opacity var(--transition), transform var(--transition);
  cursor: default;
}
.pkt-node.active { opacity: 1; transform: scale(1.1); }
.pkt-node.visited { opacity: 0.7; }
.pkt-node-icon { font-size: 1.8rem; }
.pkt-node-label { font-size: 0.7rem; color: var(--text-muted); text-align: center; }
.pkt-packet {
  position: absolute; top: 0.5rem; font-size: 1.1rem;
  transition: left 0.6s cubic-bezier(.4,0,.2,1);
  display: none; pointer-events: none;
}
.pkt-controls { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.pkt-info {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.25rem;
}
.pkt-info-head { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.75rem; }
.pkt-info-table { border-collapse: collapse; width: 100%; font-size: 0.82rem; }
.pkt-field-key { color: var(--text-muted); padding: 0.2rem 0.8rem 0.2rem 0; white-space: nowrap; }
.pkt-field-val { font-family: var(--font-mono); color: var(--text-primary); }
.pkt-info-note { margin-top: 0.75rem; font-size: 0.82rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 0.5rem; }

/* ════════════════════════════════════════════════════════
   2. DNS SIMULATOR
════════════════════════════════════════════════════════ */
.dns-input-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.dns-stage {
  position: relative; background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); height: 240px; margin-bottom: 0.75rem; overflow: visible;
}
.dns-node {
  position: absolute; display: flex; flex-direction: column; align-items: center; gap: 0.2rem;
  transform: translate(-50%, -50%); transition: all var(--transition);
}
.dns-node-icon { font-size: 1.6rem; }
.dns-node-label { font-size: 0.65rem; color: var(--text-muted); text-align: center; white-space: nowrap; }
.dns-active .dns-node-icon { filter: drop-shadow(0 0 4px var(--accent)); }
.dns-active .dns-node-label { color: var(--accent); }
.dns-desc { min-height: 80px; background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.75rem 1rem; margin-bottom: 0.75rem; font-size: 0.85rem; }
.dns-step-info { display: flex; flex-direction: column; gap: 0.3rem; }
.dns-arrow-label { font-family: var(--font-mono); color: var(--accent); font-size: 0.82rem; }
.dns-resp { font-size: 0.8rem; color: var(--text-secondary); }
.dns-step-desc { color: var(--text-muted); font-size: 0.82rem; margin: 0; }
.dns-progress { display: flex; align-items: center; gap: 0.75rem; }
.dns-step-lbl { font-size: 0.78rem; color: var(--text-muted); flex: 1; text-align: center; }

/* ════════════════════════════════════════════════════════
   3. MITM SIMULATOR
════════════════════════════════════════════════════════ */
.mitm-toggle-row { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.mitm-mode-btn {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-secondary); padding: 0.4rem 1rem; font-size: 0.82rem; cursor: pointer;
  font-family: var(--font-body); transition: all var(--transition);
}
.mitm-mode-btn.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.mitm-stage {
  display: flex; align-items: center; justify-content: space-between; gap: 0.25rem;
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 4.5rem 1rem 1.5rem; margin-bottom: 0.75rem; flex-wrap: nowrap; overflow-x: auto;
}
.mitm-actor { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; min-width: 70px; }
.mitm-actor-icon { font-size: 1.8rem; }
.mitm-actor-name { font-size: 0.72rem; color: var(--text-muted); }
.mitm-attacker { position: relative; }
.mitm-attacker-sees {
  position: absolute; top: -60px; left: 50%; transform: translateX(-50%);
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  padding: 0.3rem 0.5rem; font-size: 0.65rem; font-family: var(--font-mono); white-space: pre;
  text-align: center; color: var(--text-muted); min-width: 120px;
}
.mitm-caught .mitm-attacker-sees { border-color: var(--error-bdr); color: var(--error-txt); background: #2d1515; }
.mitm-channel { display: flex; flex-direction: column; align-items: center; flex: 1; min-width: 60px; }
.mitm-data-flow {
  font-size: 0.65rem; font-family: var(--font-mono); color: var(--text-muted);
  margin-bottom: 0.2rem; text-align: center; white-space: nowrap; overflow: hidden;
  max-width: 100px; text-overflow: ellipsis; transition: color 0.3s, opacity 0.3s;
}
.mitm-flow-active { color: var(--accent); }
.mitm-arrow { width: 60px; height: 20px; color: var(--border); }
.mitm-explain { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 1rem; padding: 0.75rem 1rem; background: var(--bg-secondary); border-radius: var(--radius-xs); border-left: 3px solid var(--accent); }

/* ════════════════════════════════════════════════════════
   4. OSI ENCAPSULATION
════════════════════════════════════════════════════════ */
.osi-encap-stage {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; margin-bottom: 1rem;
}
.osi-data-block { display: flex; flex-direction: column; gap: 3px; }
.osi-segment {
  border-radius: var(--radius-xs); padding: 0.35rem 0.8rem; font-size: 0.78rem;
  font-family: var(--font-mono); cursor: pointer; display: flex; align-items: center;
  justify-content: space-between; transition: opacity var(--transition);
  animation: osiSlideIn 0.3s ease;
}
.osi-data { background: var(--accent-dim); border: 1px solid var(--accent); color: var(--accent); font-weight: 600; }
.osi-hdr {
  background: color-mix(in srgb, var(--layer-color, var(--accent)) 15%, var(--bg-secondary));
  border: 1px solid var(--layer-color, var(--accent));
  color: var(--layer-color, var(--accent));
}
.osi-hdr:hover { opacity: 0.85; }
.osi-hdr-tag { font-size: 0.72rem; opacity: 0.8; }
.osi-hdr-label { font-size: 0.72rem; opacity: 0.9; }
.osi-controls { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.osi-details { min-height: 60px; }
.osi-detail-card {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.75rem 1rem; font-size: 0.82rem; animation: fadeIn 0.2s ease;
}
.osi-detail-card strong { display: block; margin-bottom: 0.4rem; }
.osi-detail-pre { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-secondary); white-space: pre-wrap; margin: 0; }
@keyframes osiSlideIn { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: translateX(0); } }

/* ════════════════════════════════════════════════════════
   5. HTTP BUILDER
════════════════════════════════════════════════════════ */
.http-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 700px) { .http-wrap { grid-template-columns: 1fr; } }
.http-form { display: flex; flex-direction: column; gap: 0.6rem; }
.http-label { font-size: 0.78rem; color: var(--text-muted); display: block; }
.http-headers-list { display: flex; flex-direction: column; gap: 0.4rem; }
.http-header-row { display: flex; align-items: center; gap: 0.3rem; }
.http-header-row span { color: var(--text-muted); font-size: 0.8rem; }
.http-hkey { width: 120px; flex-shrink: 0; }
.http-hval { flex: 1; }
.http-body { min-height: 80px; }
.http-preview { display: flex; flex-direction: column; gap: 0.5rem; }
.http-preview-label { font-size: 0.78rem; color: var(--text-muted); }
.http-raw {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  padding: 0.75rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-secondary);
  white-space: pre-wrap; word-break: break-all; min-height: 160px; flex: 1; margin: 0;
}

/* ════════════════════════════════════════════════════════
   6. TCP/IP HEADER BUILDER
════════════════════════════════════════════════════════ */
.tcp-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 700px) { .tcp-wrap { grid-template-columns: 1fr; } }
.tcp-fieldset {
  border: 1px solid var(--border); border-radius: var(--radius-xs); padding: 0.75rem;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.tcp-fieldset legend { font-size: 0.78rem; color: var(--accent); padding: 0 0.3rem; }
.tcp-fieldset label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.78rem; color: var(--text-muted); }
.tcp-num { width: 100px; }
.tcp-flags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.tcp-flag { display: flex; align-items: center; gap: 0.2rem; font-size: 0.78rem; color: var(--text-secondary); cursor: pointer; }
.tcp-diagram-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.tcp-diagram { display: flex; flex-direction: column; gap: 4px; font-size: 0.72rem; font-family: var(--font-mono); }
.tcp-layer { border-radius: var(--radius-xs); overflow: hidden; }
.tcp-layer--ip  { border: 1px solid #4f8ef7; }
.tcp-layer--tcp { border: 1px solid #8b5cf6; }
.tcp-layer--data{ border: 1px solid var(--border); }
.tcp-field-row { display: flex; border-bottom: 1px solid rgba(255,255,255,0.06); }
.tcp-field-row:last-child { border-bottom: none; }
.tcp-field {
  padding: 0.2rem 0.4rem; border-right: 1px solid rgba(255,255,255,0.06);
  color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  min-width: 0;
}
.tcp-field:last-child { border-right: none; }
.tcp-field--error { color: var(--error-txt) !important; background: rgba(239,68,68,0.08); }
.tcp-field--active { color: var(--accent); background: var(--accent-dim); }
.tcp-layer-label { font-size: 0.65rem; color: var(--text-muted); padding: 0.15rem 0.4rem; text-align: right; background: rgba(0,0,0,0.15); }
.tcp-layer--ip  .tcp-layer-label { color: #4f8ef7; }
.tcp-layer--tcp .tcp-layer-label { color: #8b5cf6; }

/* ════════════════════════════════════════════════════════
   7. TOPOLOGY BUILDER
════════════════════════════════════════════════════════ */
.topo-workspace {
  display: flex; flex-direction: column; gap: 1rem;
}
.topo-toolbar {
  display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 0.75rem;
  background: #1a1d27; border: 1px solid var(--border); border-radius: var(--radius);
}
.topo-tools-group,
.topo-actions-group {
  display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center;
}
.topo-tools-group { flex: 1 1 420px; }
.topo-actions-group { flex: 2 1 460px; justify-content: flex-end; }
.topo-tool,
.topo-action-btn,
.topo-template {
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-secondary); font-family: var(--font-body); transition: all var(--transition);
}
.topo-tool,
.topo-action-btn {
  padding: 0.45rem 0.7rem; font-size: 0.75rem; cursor: pointer;
}
.topo-tool {
  display: inline-flex; align-items: center; gap: 0.35rem; min-width: 92px; justify-content: center;
}
.topo-tool span { font-size: 0.72rem; }
.topo-tool:hover,
.topo-action-btn:hover,
.topo-template:hover { border-color: var(--accent); color: var(--accent); }
.topo-tool.active,
.topo-action-btn.active {
  background: var(--accent-dim); border-color: var(--accent); color: var(--accent);
}
.topo-template {
  padding: 0.44rem 0.65rem; font-size: 0.75rem; min-width: 180px;
}
.topo-main {
  display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 1rem;
}
.topo-stage {
  display: flex; flex-direction: column; gap: 0.75rem;
}
.topo-stage-topbar {
  display: flex; justify-content: space-between; gap: 0.75rem; align-items: center;
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
}
.topo-stage-copy { font-size: 0.8rem; color: var(--text-muted); }
.topo-port-select {
  display: flex; align-items: center; gap: 0.5rem; font-size: 0.78rem; color: var(--text-muted);
}
.topo-port-select select {
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-primary); padding: 0.35rem 0.45rem;
}
.topo-canvas-scroll {
  max-height: 600px; overflow: auto; background: #0f1117; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.75rem;
}
.topo-canvas-wrap {
  position: relative; width: 1200px; height: 700px; overflow: hidden; user-select: none;
  border-radius: calc(var(--radius) - 2px);
  background:
    linear-gradient(rgba(79, 142, 247, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 142, 247, 0.08) 1px, transparent 1px),
    #10141d;
  background-size: 80px 80px, 80px 80px, auto;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
}
.topo-grid-highlight,
.topo-drop-feedback {
  position: absolute; width: 80px; height: 80px; border-radius: 14px; pointer-events: none;
}
.topo-grid-highlight {
  border: 1px dashed rgba(79, 142, 247, 0.55); background: rgba(79, 142, 247, 0.08);
  opacity: 0; transition: opacity 0.15s ease;
}
.topo-grid-highlight.visible { opacity: 1; }
.topo-drop-feedback {
  border: 2px solid rgba(239,68,68,0.8); background: rgba(239,68,68,0.12); opacity: 0;
}
.topo-drop-feedback.active {
  opacity: 1; animation: topoShake 0.5s ease;
}
.topo-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.topo-svg defs { pointer-events: none; }
.topo-edge-group { pointer-events: auto; }
.topo-edge {
  fill: none; stroke: #475063; stroke-width: 3; transition: stroke 0.25s ease, filter 0.25s ease;
}
.topo-edge--warn { stroke: #f59e0b; stroke-dasharray: 6 5; }
.topo-edge--active {
  stroke: var(--accent); filter: drop-shadow(0 0 4px rgba(79, 142, 247, 0.65));
}
.topo-edge-label {
  font-size: 12px; fill: var(--text-primary); cursor: text; user-select: none;
}
.topo-edge-label-bg { fill: rgba(15,17,23,0.88); stroke: rgba(255,255,255,0.08); rx: 10; ry: 10; }
.topo-nodes,
.topo-traffic-layer,
.topo-overlay-layer { position: absolute; inset: 0; }
.topo-node {
  position: absolute; width: 80px; height: 80px; padding: 0.35rem; border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08); background: rgba(26,29,39,0.95);
  display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 0.2rem;
  cursor: grab; transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  touch-action: none;
}
.topo-node:hover { border-color: rgba(79, 142, 247, 0.6); }
.topo-node:active { cursor: grabbing; }
.topo-node--selected {
  border-color: var(--accent); box-shadow: 0 0 0 1px rgba(79, 142, 247, 0.3), 0 12px 24px rgba(0,0,0,0.25);
}
.topo-node--connect {
  border-color: #f59e0b; box-shadow: 0 0 0 1px rgba(245,158,11,0.3), 0 0 20px rgba(245,158,11,0.16);
}
.topo-node--pulse { animation: topoPulse 0.9s ease; }
.topo-node--invalid { animation: topoShake 0.5s ease; border-color: rgba(239,68,68,0.9); }
.topo-node-icon { font-size: 1.8rem; line-height: 1; }
.topo-node-label {
  max-width: 68px; font-size: 0.68rem; color: var(--text-primary); text-align: center;
  line-height: 1.15; word-break: break-word;
}
.topo-node-ip {
  max-width: 68px; font-size: 0.58rem; color: var(--text-muted); text-align: center; line-height: 1.2;
}
.topo-packet,
.topo-status-badge {
  position: absolute; pointer-events: none; transform: translate(-50%, -50%);
}
.topo-packet {
  width: 18px; height: 18px; border-radius: 999px; background: linear-gradient(135deg, #4f8ef7, #9bc1ff);
  box-shadow: 0 0 14px rgba(79,142,247,0.6);
}
.topo-packet--danger { background: linear-gradient(135deg, #ef4444, #fca5a5); box-shadow: 0 0 14px rgba(239,68,68,0.48); }
.topo-status-badge {
  font-size: 1rem; width: 24px; height: 24px; display: grid; place-items: center;
}
.topo-callout {
  position: absolute; min-width: 210px; max-width: 280px; padding: 0.65rem 0.75rem;
  background: rgba(26,29,39,0.98); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 14px; color: var(--text-secondary); font-size: 0.76rem; line-height: 1.45;
  box-shadow: 0 20px 45px rgba(0,0,0,0.28); z-index: 5;
}
.topo-callout strong { color: var(--text-primary); }
.topo-callout--danger { border-left-color: #ef4444; }
.topo-callout--warn { border-left-color: #f59e0b; }
.topo-hint {
  position: absolute; left: 50%; bottom: 1rem; transform: translateX(-50%);
  background: rgba(15,17,23,0.92); border: 1px solid var(--border); border-radius: 999px;
  padding: 0.45rem 0.75rem; font-size: 0.72rem; color: var(--text-muted); white-space: nowrap;
}
.topo-sidepanel {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; min-height: 420px; transform: translateX(14px); opacity: 0.88; transition: transform 0.25s ease, opacity 0.25s ease;
}
.topo-sidepanel.open { transform: translateX(0); opacity: 1; }
.topo-sidepanel-head {
  padding: 0.9rem 1rem; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.topo-sidepanel-title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); }
.topo-sidepanel-body { padding: 1rem; display: flex; flex-direction: column; gap: 0.9rem; }
.topo-inspector-empty { color: var(--text-muted); font-size: 0.82rem; line-height: 1.5; }
.topo-inspector-field { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.76rem; color: var(--text-muted); }
.topo-inspector-input,
.topo-inspector-textarea {
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  color: var(--text-primary); padding: 0.5rem 0.6rem; font-size: 0.8rem;
}
.topo-inspector-textarea { min-height: 88px; resize: vertical; }
.topo-conn-list { display: flex; flex-direction: column; gap: 0.45rem; }
.topo-conn-chip {
  background: rgba(255,255,255,0.02); border: 1px solid var(--border); border-radius: 12px;
  padding: 0.45rem 0.55rem; font-size: 0.76rem; color: var(--text-secondary);
}
.topo-sidepanel-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.topo-info-link {
  display: inline-flex; align-items: center; gap: 0.35rem; text-decoration: none;
  background: var(--accent-dim); border: 1px solid rgba(79,142,247,0.35); color: var(--accent);
  padding: 0.5rem 0.7rem; border-radius: var(--radius-xs); font-size: 0.76rem;
}
.topo-sim-panel {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 0.9rem 1rem; display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 1rem;
}
.topo-sim-title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.35rem; }
.topo-sim-subtitle { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.topo-sim-log,
.topo-sim-steps {
  display: flex; flex-direction: column; gap: 0.6rem;
}
.topo-sim-step {
  border: 1px solid var(--border); border-radius: 14px; padding: 0.65rem 0.75rem; background: rgba(255,255,255,0.02);
}
.topo-sim-step strong { color: var(--text-primary); display: block; margin-bottom: 0.2rem; }
.topo-sim-step span { color: var(--text-secondary); font-size: 0.78rem; line-height: 1.5; }
.topo-toast {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translate(-50%, 18px);
  background: rgba(26,29,39,0.96); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  color: var(--text-secondary); padding: 0.7rem 0.9rem; border-radius: 14px; z-index: 1400;
  opacity: 0; transition: opacity 0.25s ease, transform 0.25s ease;
  box-shadow: 0 16px 34px rgba(0,0,0,0.28);
}
.topo-toast.show { opacity: 1; transform: translate(-50%, 0); }
.topo-toast--warn { border-left-color: #f59e0b; }
.topo-toast--danger { border-left-color: #ef4444; }
@keyframes topoShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}
@keyframes topoPulse {
  0% { box-shadow: 0 0 0 0 rgba(79,142,247,0.45); }
  100% { box-shadow: 0 0 0 18px rgba(79,142,247,0); }
}
@media (max-width: 1100px) {
  .topo-main { grid-template-columns: 1fr; }
  .topo-sidepanel { min-height: 0; }
}
@media (max-width: 760px) {
  .topo-stage-topbar,
  .topo-sim-panel { grid-template-columns: 1fr; display: grid; }
  .topo-actions-group { justify-content: flex-start; }
  .topo-template { min-width: 0; width: 100%; }
}

/* ── Topologia v3: overrides de interação ─────────────── */
.topo-workspace--v3 .topo-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}
.topo-workspace--v3 .topo-toolbar-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.topo-workspace--v3 .topo-toolbar-group--devices { flex: 1 1 360px; }
.topo-workspace--v3 .topo-toolbar-group--actions { flex: 1 1 320px; }
.topo-workspace--v3 .topo-toolbar-group--storage { flex: 1 1 240px; justify-content: flex-end; }
.topo-workspace--v3 .topo-toolbar-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}
.topo-workspace--v3 .topo-tool,
.topo-workspace--v3 .topo-action-btn,
.topo-workspace--v3 .topo-template {
  min-height: 38px;
  background: #161924;
}
.topo-workspace--v3 .topo-tool {
  min-width: 92px;
  position: relative;
  justify-content: center;
}
.topo-workspace--v3 .topo-tool.active {
  animation: topoPulseSelect 1.1s ease-in-out infinite;
}
.topo-workspace--v3 .topo-tool-icon { font-size: 1rem; }
.topo-workspace--v3 .topo-main {
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}
.topo-workspace--v3 .topo-stage { min-width: 0; }
.topo-workspace--v3 .topo-canvas-shell { position: relative; }
.topo-workspace--v3 .topo-canvas-scroll {
  max-height: 550px;
  padding: 0.75rem;
  overflow: auto;
}
.topo-workspace--v3 .topo-canvas-viewport {
  position: relative;
  width: 1400px;
  height: 800px;
}
.topo-workspace--v3 .topo-canvas-wrap {
  width: 1400px;
  height: 800px;
  transform-origin: top left;
  background:
    radial-gradient(circle, #2a2d3a 1px, transparent 1px) 0 0 / 45px 45px,
    #0f1117;
  overflow: hidden;
}
.topo-workspace--v3 .topo-canvas--placing { cursor: crosshair; }
.topo-workspace--v3 .topo-edge-html,
.topo-workspace--v3 .topo-nodes,
.topo-workspace--v3 .topo-traffic-layer,
.topo-workspace--v3 .topo-overlay-layer {
  position: absolute;
  inset: 0;
}
.topo-workspace--v3 .topo-edge-html,
.topo-workspace--v3 .topo-overlay-layer { pointer-events: none; }
.topo-workspace--v3 .topo-grid-highlight,
.topo-workspace--v3 .topo-drop-feedback {
  width: 90px;
  height: 90px;
}
.topo-workspace--v3 .topo-grid-highlight {
  border: 1px dashed rgba(79,142,247,0.65);
  background: rgba(79,142,247,0.10);
}
.topo-workspace--v3 .topo-drop-feedback {
  border-color: rgba(239,68,68,0.9);
  background: rgba(239,68,68,0.12);
}
.topo-workspace--v3 .topo-empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}
.topo-workspace--v3 .topo-empty-state.hidden { display: none; }
.topo-workspace--v3 .topo-empty-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: center;
  background: rgba(26,29,39,0.96);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1rem 1.2rem;
  color: var(--text-secondary);
  box-shadow: 0 18px 36px rgba(0,0,0,0.22);
}
.topo-workspace--v3 .topo-empty-card strong { color: var(--text-primary); }
.topo-workspace--v3 .topo-node {
  width: 90px;
  height: 90px;
  padding: 0.45rem 0.35rem 0.4rem;
  background: rgba(26,29,39,0.98);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  cursor: grab;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, opacity 0.18s ease;
}
.topo-workspace--v3 .topo-node:hover {
  transform: scale(1.05);
  box-shadow: 0 0 0 1px rgba(79,142,247,0.25), 0 12px 22px rgba(0,0,0,0.25);
}
.topo-workspace--v3 .topo-node:active { cursor: grabbing; }
.topo-workspace--v3 .topo-node--selected,
.topo-workspace--v3 .topo-node--origin {
  border-color: #4f8ef7;
  box-shadow: 0 0 0 1px rgba(79,142,247,0.28), 0 14px 28px rgba(0,0,0,0.28);
}
.topo-workspace--v3 .topo-node--origin {
  animation: topoPulseSelect 1s ease-in-out infinite;
}
.topo-workspace--v3 .topo-node--dragging {
  opacity: 0.3;
  cursor: grabbing;
}
.topo-workspace--v3 .topo-node--enter { animation: topoNodeEnter 0.2s ease; }
.topo-workspace--v3 .topo-node-badge {
  position: absolute;
  top: -10px;
  right: 8px;
  display: none;
  background: #4f8ef7;
  color: #fff;
  font-size: 0.62rem;
  padding: 0.12rem 0.35rem;
  border-radius: 999px;
}
.topo-workspace--v3 .topo-node--origin .topo-node-badge { display: inline-flex; }
.topo-workspace--v3 .topo-node-label { max-width: 76px; }
.topo-workspace--v3 .topo-node-ip { max-width: 76px; }
.topo-workspace--v3 .topo-connector {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: none;
  background: #4f8ef7;
  box-shadow: 0 0 0 3px rgba(79,142,247,0.22);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.topo-workspace--v3 .topo-node--handles .topo-connector {
  opacity: 1;
  pointer-events: auto;
}
.topo-workspace--v3 .topo-connector:hover { transform: scale(1.15); }
.topo-workspace--v3 .topo-connector--n { top: -5px; left: 50%; transform: translateX(-50%); }
.topo-workspace--v3 .topo-connector--s { bottom: -5px; left: 50%; transform: translateX(-50%); }
.topo-workspace--v3 .topo-connector--e { right: -5px; top: 50%; transform: translateY(-50%); }
.topo-workspace--v3 .topo-connector--w { left: -5px; top: 50%; transform: translateY(-50%); }
.topo-workspace--v3 .topo-edge-hit {
  stroke: transparent;
  stroke-width: 18;
}
.topo-workspace--v3 .topo-edge {
  stroke: #4f8ef7;
  stroke-width: 2;
}
.topo-workspace--v3 .topo-edge--hovered { stroke-width: 4; }
.topo-workspace--v3 .topo-edge--warn { stroke-dasharray: 7 6; }
.topo-workspace--v3 .topo-edge--draft { stroke-dasharray: 6 4; opacity: 0.9; }
.topo-workspace--v3 .topo-edge-label,
.topo-workspace--v3 .topo-edge-delete {
  position: absolute;
  transform: translate(-50%, -50%);
  pointer-events: auto;
}
.topo-workspace--v3 .topo-edge-label {
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  background: rgba(15,17,23,0.92);
  color: var(--text-primary);
  padding: 0.2rem 0.55rem;
  font-size: 0.7rem;
  cursor: text;
}
.topo-workspace--v3 .topo-edge-delete {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 1px solid rgba(239,68,68,0.38);
  background: rgba(26,29,39,0.96);
  color: #ef4444;
  cursor: pointer;
}
.topo-workspace--v3 .topo-edge-token {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: #4f8ef7;
  box-shadow: 0 0 10px rgba(79,142,247,0.8);
  transform: translate(-50%, -50%);
  animation: topoEdgeTravel 2s linear infinite;
}
.topo-workspace--v3 .topo-edge-editor {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 120px;
  padding: 0.28rem 0.45rem;
  border-radius: 10px;
  border: 1px solid #4f8ef7;
  background: #11141c;
  color: var(--text-primary);
  pointer-events: auto;
}
.topo-workspace--v3 .topo-node-editor {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 132px;
  padding: 0.3rem 0.45rem;
  border-radius: 10px;
  border: 1px solid #4f8ef7;
  background: #11141c;
  color: var(--text-primary);
  pointer-events: auto;
  z-index: 8;
}
.topo-workspace--v3 .topo-drag-ghost,
.topo-workspace--v3 .topo-drag-proxy {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.55rem;
  border-radius: 14px;
  background: rgba(26,29,39,0.9);
  border: 1px solid rgba(79,142,247,0.45);
  color: var(--text-primary);
  box-shadow: 0 10px 24px rgba(0,0,0,0.22);
}
.topo-workspace--v3 .topo-drag-ghost {
  pointer-events: none;
  opacity: 0.88;
  z-index: 5;
}
.topo-workspace--v3 .topo-drag-proxy {
  position: fixed;
  top: -9999px;
  left: -9999px;
}
.topo-workspace--v3 .topo-zoom-controls {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(15,17,23,0.94);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.45rem;
}
.topo-workspace--v3 .topo-zoom-btn {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #161924;
  color: var(--text-primary);
  cursor: pointer;
}
.topo-workspace--v3 .topo-zoom-value {
  min-width: 42px;
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-muted);
}
.topo-workspace--v3 .topo-undo-float {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(15,17,23,0.96);
  color: var(--text-primary);
  padding: 0.45rem 0.75rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}
.topo-workspace--v3 .topo-undo-float.show {
  opacity: 1;
  pointer-events: auto;
}
.topo-workspace--v3 .topo-inspector-copy {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem 0.75rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}
.topo-workspace--v3 .topo-conn-list {
  margin: 0;
  padding-left: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  color: var(--text-secondary);
}
.topo-workspace--v3 .topo-tooltip {
  position: absolute;
  transform: translate(-50%, -100%);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: rgba(15,17,23,0.96);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.45rem 0.55rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
}
.topo-workspace--v3 .topo-tooltip strong { color: var(--text-primary); }
.topo-workspace--v3 .topo-sidepanel {
  transform: translateX(24px);
  opacity: 0;
  position: sticky;
  top: 0;
}
.topo-workspace--v3 .topo-sidepanel.open {
  transform: translateX(0);
  opacity: 1;
}
.topo-workspace--v3 .topo-toast {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.topo-workspace--v3 .topo-toast-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.topo-workspace--v3 .topo-toast-btn {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #161924;
  color: var(--text-primary);
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

@keyframes topoPulseSelect {
  0% { box-shadow: 0 0 0 0 rgba(79,142,247,0.4); }
  100% { box-shadow: 0 0 0 14px rgba(79,142,247,0); }
}
@keyframes topoNodeEnter {
  from { transform: scale(0.5); }
  to { transform: scale(1); }
}
@keyframes topoEdgeTravel {
  from { transform: translate(-50%, -50%) translate(0, 0); }
  to { transform: translate(-50%, -50%) translate(var(--dx), var(--dy)); }
}

@media (max-width: 1100px) {
  .topo-workspace--v3 .topo-main { grid-template-columns: 1fr; }
  .topo-workspace--v3 .topo-toolbar-group--storage { justify-content: flex-start; }
  .topo-workspace--v3 .topo-sidepanel { position: relative; }
}
@media (max-width: 760px) {
  .topo-workspace--v3 .topo-toolbar-divider { display: none; }
  .topo-workspace--v3 .topo-toolbar-group { width: 100%; }
  .topo-workspace--v3 .topo-toolbar-group--storage { justify-content: flex-start; }
}

/* ════════════════════════════════════════════════════════
   STUDY HEATMAP
════════════════════════════════════════════════════════ */
.hm-summary { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.hm-badge {
  font-size: 0.82rem; color: var(--text-secondary);
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius-xs); padding: 0.25rem 0.7rem;
}
.hm-streak strong { color: #f59e0b; }
.hm-outer { overflow-x: auto; }
.hm-month-row { display: flex; padding-left: 24px; margin-bottom: 2px; }
.hm-month-cell { width: 13px; font-size: 0.6rem; color: var(--text-muted); flex-shrink: 0; }
.hm-body { display: flex; gap: 3px; }
.hm-day-col { display: flex; flex-direction: column; gap: 2px; width: 20px; flex-shrink: 0; }
.hm-day-lbl { height: 11px; font-size: 0.6rem; color: var(--text-muted); line-height: 11px; text-align: right; padding-right: 3px; }
.hm-weeks { display: flex; gap: 2px; }
.hm-week { display: flex; flex-direction: column; gap: 2px; }
.hm-cell { width: 11px; height: 11px; border-radius: 2px; flex-shrink: 0; }
.hm-cell--empty { background: transparent; }
.hm-lv0 { background: var(--bg-tertiary); }
.hm-lv1 { background: #0e4429; }
.hm-lv2 { background: #006d32; }
.hm-lv3 { background: #26a641; }
.hm-lv4 { background: #39d353; }
[data-theme="light"] .hm-lv1 { background: #9be9a8; }
[data-theme="light"] .hm-lv2 { background: #40c463; }
[data-theme="light"] .hm-lv3 { background: #30a14e; }
[data-theme="light"] .hm-lv4 { background: #216e39; }
.hm-legend { display: flex; align-items: center; gap: 3px; margin-top: 0.5rem; font-size: 0.65rem; color: var(--text-muted); }

/* ════════════════════════════════════════════════════════
   WEEKLY REPORT TOAST
════════════════════════════════════════════════════════ */
.rw-weekly-report {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 1200;
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1.25rem; min-width: 240px; max-width: 320px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
  transform: translateY(20px); opacity: 0; transition: transform 0.35s ease, opacity 0.35s ease;
}
.rw-weekly-report.wr-show { transform: translateY(0); opacity: 1; }
.wr-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; font-size: 0.88rem; }
.wr-close { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 1rem; line-height: 1; }
.wr-stats { display: flex; gap: 1rem; }
.wr-stat { display: flex; flex-direction: column; align-items: center; }
.wr-num { font-size: 1.3rem; font-weight: 700; color: var(--accent); line-height: 1; }
.wr-lbl { font-size: 0.68rem; color: var(--text-muted); text-align: center; margin-top: 0.2rem; }

/* ════════════════════════════════════════════════════════
   CHEAT SHEETS (resumos.html)
════════════════════════════════════════════════════════ */
.resumos-wrapper { max-width: 1000px; }
.cs-section { margin-bottom: 2.5rem; page-break-inside: avoid; }
.cs-title { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--accent); display: inline-block; }
.cs-subtitle { font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.5rem; }
.cs-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; margin-bottom: 0.5rem; }
.cs-table th { background: var(--bg-secondary); color: var(--text-muted); padding: 0.35rem 0.6rem; text-align: left; border: 1px solid var(--border); font-weight: 600; font-size: 0.75rem; }
.cs-table td { padding: 0.3rem 0.6rem; border: 1px solid var(--border); color: var(--text-secondary); vertical-align: top; }
.cs-table td code { font-family: var(--font-mono); font-size: 0.78rem; background: var(--bg-tertiary); padding: 0.1rem 0.3rem; border-radius: 3px; }
.cs-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
[data-theme="light"] .cs-table tr:nth-child(even) td { background: rgba(0,0,0,0.02); }
.cs-two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 600px) { .cs-two-col { grid-template-columns: 1fr; } }
.cs-formula-box {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: var(--radius-xs);
  padding: 0.6rem 0.9rem; font-size: 0.82rem; color: var(--text-secondary); margin-top: 0.5rem;
}

@media print {
  .print-btn,
  .rw-weekly-report,
  #heatmap-section {
    display: none !important;
  }

  .resumos-wrapper {
    max-width: none;
    padding: 0 !important;
  }

  .resumos-wrapper .page-header {
    margin-bottom: 0.6cm;
  }

  .cs-section {
    margin-bottom: 0.8cm;
    break-inside: avoid;
  }

  .cs-title,
  .cs-subtitle,
  .cs-table th,
  .cs-table td,
  .cs-formula-box {
    color: #111 !important;
  }

  .cs-title {
    border-bottom-color: #111 !important;
  }

  .cs-table {
    font-size: 9.5pt;
  }

  .cs-table th {
    background: #eee !important;
  }

  .cs-table td code {
    background: #f0f0f0 !important;
    color: #111 !important;
  }

  .resumos-wrapper a[href]::after {
    content: none !important;
  }
}

/* ══════════════════════════════════════════════════════
   SHARED: danger button variant
══════════════════════════════════════════════════════ */
.btn-lab--danger {
  background: var(--error-bdr); color: #fff; border: none;
}
.btn-lab--danger:hover { background: #dc2626; }

/* ══════════════════════════════════════════════════════
   8. SUBNET CALCULATOR
══════════════════════════════════════════════════════ */
.subnet-modes {
  display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1rem;
}
.subnet-n-input { flex: 0 0 120px !important; }
.subnet-result { margin-top: .75rem; }
.subnet-error { color: var(--error-txt, #e44); font-weight: 600; font-size: .85rem; }
.subnet-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.subnet-table th, .subnet-table td {
  padding: .4rem .75rem; border-bottom: 1px solid var(--border); text-align: left;
}
.subnet-table th {
  background: var(--bg-tertiary); color: var(--text-muted);
  font-weight: 600; width: 50%; font-size: .8rem;
}
.subnet-table code { font-family: var(--font-mono); font-size: .82rem; color: var(--accent); }
.subnet-highlight td {
  background: var(--accent-dim); font-weight: 600; color: var(--text-primary);
}
.subnet-div-summary { margin-bottom: .75rem; font-size: .85rem; color: var(--text-secondary); }
.subnet-div-scroll { overflow-x: auto; }

/* ══════════════════════════════════════════════════════
   9. TCP HANDSHAKE
══════════════════════════════════════════════════════ */
.hs-stage {
  display: flex; align-items: flex-start; gap: 0; min-height: 240px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-secondary); padding: 1.25rem; overflow: hidden; margin-bottom: 1rem;
}
.hs-actor {
  display: flex; flex-direction: column; align-items: center;
  gap: .35rem; flex: 0 0 90px; text-align: center;
}
.hs-actor-icon { font-size: 2rem; }
.hs-actor-name { font-size: .78rem; font-weight: 600; color: var(--text-muted); }
.hs-state {
  font-size: .68rem; padding: .2rem .45rem; border-radius: var(--radius-xs);
  background: var(--bg-tertiary); color: var(--text-muted);
  white-space: nowrap; font-family: var(--font-mono);
}
.hs-state-ok { background: #1a6b3a; color: #7fff9a; }

.hs-middle {
  flex: 1; display: flex; flex-direction: column; align-items: stretch;
  position: relative; padding: .5rem 0; gap: .75rem;
}
.hs-vline {
  position: absolute; top: 0; bottom: 0; left: 50%;
  width: 1px; background: var(--border); transform: translateX(-50%);
}
.hs-arrow { position: relative; z-index: 1; }
.hs-arrow-label {
  display: flex; flex-direction: column; align-items: center; gap: .1rem;
  margin-bottom: .2rem; font-size: .78rem;
}
.hs-arrow-name { font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.hs-arrow-seq { color: var(--text-muted); font-size: .7rem; font-family: var(--font-mono); }
.hs-arrow-flags em {
  font-style: normal; background: var(--accent); color: #fff;
  border-radius: 3px; padding: 0 .3rem; font-size: .68rem; margin: 0 .1rem;
}
.hs-arrow-line {
  position: relative; height: 5px; background: var(--accent);
  border-radius: 3px; margin: 0 .5rem;
}
.hs-arrow-head {
  position: absolute; top: 50%; width: 0; height: 0; transform: translateY(-50%);
}
.hs-head-right {
  right: -6px;
  border-top: 6px solid transparent; border-bottom: 6px solid transparent;
  border-left: 9px solid var(--accent);
}
.hs-head-left {
  left: -6px;
  border-top: 6px solid transparent; border-bottom: 6px solid transparent;
  border-right: 9px solid var(--accent);
}
.hs-arrow-left .hs-arrow-line,
.hs-arrow-left .hs-arrow-name { background: none; }
.hs-arrow-left .hs-arrow-line { background: #e67e22; }
.hs-arrow-left .hs-head-left { border-right-color: #e67e22; }
.hs-arrow-left .hs-arrow-name { color: #e67e22; }

.hs-info {
  padding: .7rem 1rem; background: var(--bg-secondary); border-radius: var(--radius-xs);
  border-left: 3px solid var(--accent); font-size: .85rem; color: var(--text-secondary);
}
.hs-done { color: #2ecc71; font-weight: 600; }

/* ══════════════════════════════════════════════════════
   10. ARP SIMULATOR
══════════════════════════════════════════════════════ */
.arp-controls {
  display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; margin-bottom: .75rem;
}
.arp-label { display: flex; align-items: center; gap: .35rem; font-size: .83rem; color: var(--text-muted); }

.arp-stage {
  display: flex; flex-wrap: wrap; gap: .75rem; align-items: flex-start;
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; position: relative; min-height: 130px;
  margin-bottom: .75rem;
}
.arp-host {
  display: flex; flex-direction: column; align-items: center; gap: .2rem;
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-xs); padding: .6rem .9rem; font-size: .78rem;
  min-width: 105px; transition: border-color var(--transition), background var(--transition);
}
.arp-host-icon { font-size: 1.5rem; }
.arp-host-name { font-weight: 700; color: var(--text-primary); }
.arp-host-ip { color: var(--accent); font-size: .73rem; font-family: var(--font-mono); }
.arp-host-mac { color: var(--text-muted); font-size: .67rem; word-break: break-all; text-align: center; font-family: var(--font-mono); }
.arp-recv { border-color: var(--accent) !important; background: var(--accent-dim) !important; }
.arp-reply-hi { border-color: #2ecc71 !important; background: rgba(46,204,113,.1) !important; }

.arp-sw {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--text-muted); text-align: center; padding: .5rem;
}
.arp-msg {
  position: absolute; bottom: .6rem; left: 50%; transform: translateX(-50%);
  padding: .3rem .8rem; border-radius: var(--radius-xs); font-size: .8rem; font-weight: 600;
  white-space: nowrap; background: var(--accent); color: #fff; font-family: var(--font-mono);
}
.arp-msg-bcast { background: #8e44ad; }
.arp-msg-reply { background: #2ecc71; color: #000; }

.arp-log {
  padding: .6rem .75rem; background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius-xs); font-size: .8rem; max-height: 160px; overflow-y: auto;
  display: flex; flex-direction: column; gap: .2rem; margin-bottom: .75rem;
}
.arp-log-entry { padding: .15rem 0; border-bottom: 1px solid var(--border-subtle); color: var(--text-secondary); }
.arp-broadcast { color: #9b59b6; }
.arp-reply { color: #2ecc71; }
.arp-ok { color: #27ae60; }
.arp-error { color: var(--error-txt); }

.arp-cache-title { font-size: .88rem; font-weight: 600; margin-bottom: .4rem; color: var(--text-primary); }
.arp-cache-table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.arp-cache-table th, .arp-cache-table td {
  padding: .35rem .65rem; border-bottom: 1px solid var(--border); text-align: left;
}
.arp-cache-table th { background: var(--bg-tertiary); color: var(--text-muted); font-weight: 600; }
.arp-cache-table code { font-family: var(--font-mono); color: var(--accent); }
.arp-empty { color: var(--text-muted); font-style: italic; text-align: center; padding: .5rem; }
.arp-row-poisoned td { color: var(--error-txt); }

/* ══════════════════════════════════════════════════════
   11. TLS CERT INSPECTOR
══════════════════════════════════════════════════════ */
.tls-loading, .tls-empty { color: var(--text-muted); font-style: italic; padding: .5rem 0; font-size: .85rem; }
.tls-error { color: var(--error-txt); font-weight: 600; font-size: .85rem; }

.tls-result { margin-top: .75rem; }
.tls-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem;
}
.tls-card-head {
  display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; margin-bottom: .75rem;
}
.tls-badge {
  padding: .2rem .7rem; border-radius: var(--radius-xs); font-size: .78rem; font-weight: 700;
}
.tls-valid { background: #1a6b3a; color: #7fff9a; }
.tls-expiring { background: #7a4f00; color: #ffd27a; }
.tls-expired { background: #5a1212; color: var(--error-txt); }
.tls-cn { font-size: 1rem; font-weight: 700; color: var(--text-primary); }

.tls-table { width: 100%; border-collapse: collapse; font-size: .82rem; }
.tls-table th, .tls-table td {
  padding: .35rem .65rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top;
}
.tls-table th {
  background: var(--bg-tertiary); color: var(--text-muted); font-weight: 600; width: 150px;
}
.tls-table code { font-family: var(--font-mono); color: var(--accent); font-size: .78rem; }
.tls-sans { display: flex; flex-wrap: wrap; gap: .25rem; }

.tls-hist-title { margin: 1rem 0 .4rem; font-size: .88rem; font-weight: 600; color: var(--text-primary); }
.tls-hist-scroll { overflow-x: auto; }
.tls-row-expired td { color: var(--text-muted); text-decoration: line-through; }

/* ══════════════════════════════════════════════════════
   12. IP / ASN LOOKUP
══════════════════════════════════════════════════════ */
.ipasn-loading { color: var(--text-muted); font-style: italic; font-size: .85rem; }
.ipasn-error { color: var(--error-txt); font-weight: 600; font-size: .85rem; }

.ipasn-result { margin-top: .75rem; }
.ipasn-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem;
}
.ipasn-table { width: 100%; border-collapse: collapse; font-size: .84rem; margin-bottom: .5rem; }
.ipasn-table th, .ipasn-table td {
  padding: .35rem .65rem; border-bottom: 1px solid var(--border); text-align: left;
}
.ipasn-table th {
  background: var(--bg-tertiary); color: var(--text-muted); font-weight: 600; width: 42%;
}
.ipasn-table code { font-family: var(--font-mono); color: var(--accent); }
.ipasn-cc { color: var(--text-muted); font-size: .82rem; }
.ipasn-rdap-title { margin: .85rem 0 .4rem; font-size: .88rem; font-weight: 600; color: var(--text-primary); }

/* ══════════════════════════════════════════════════════
   CERTIFICATIONS PAGE (moved from cert.css)
══════════════════════════════════════════════════════ */
.cert-cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.25rem; margin-top: 1rem;
}
.cert-card {
  border: 2px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; display: flex; flex-direction: column; gap: .6rem;
}
.cert-card--netplus { border-color: #c00; }
.cert-card--ccna    { border-color: #049fd4; }
.cert-card-logo { font-size: 2rem; font-weight: 900; letter-spacing: -.05em; }
.cert-card--netplus .cert-card-logo { color: #c00; }
.cert-card--ccna    .cert-card-logo { color: #049fd4; }
.cert-card h3 { font-size: 1.1rem; margin: 0; color: var(--text-primary); }
.cert-card-code {
  font-size: .78rem; font-family: var(--font-mono); background: var(--bg-tertiary);
  display: inline-block; padding: .15rem .55rem; border-radius: var(--radius-xs); color: var(--text-muted);
}
.cert-card-facts { list-style: none; padding: 0; margin: .25rem 0; font-size: .88rem; display: flex; flex-direction: column; gap: .3rem; }
.cert-card-link { margin-top: auto; font-size: .82rem; color: var(--accent); text-decoration: none; }
.cert-card-link:hover { text-decoration: underline; }

.cert-domain-list { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.cert-domain {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 1rem 1.25rem; background: var(--bg-secondary);
}
.cert-domain-head {
  display: flex; align-items: center; gap: .75rem; margin-bottom: .5rem; flex-wrap: wrap;
}
.cert-domain-num {
  width: 26px; height: 26px; border-radius: 50%; background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: .78rem; font-weight: 700; flex-shrink: 0;
}
.cert-domain-title { font-weight: 700; font-size: .95rem; flex: 1; color: var(--text-primary); }
.cert-domain-pct { font-size: .78rem; font-weight: 700; padding: .18rem .5rem; border-radius: var(--radius-xs); }
.cert-pct-high { background: #1a4d1a; color: #7fd87f; }
.cert-pct-mid  { background: #4d3d00; color: #ffd27a; }
.cert-pct-low  { background: #3d1a1a; color: var(--error-txt); }
.cert-domain p { font-size: .85rem; margin: .25rem 0 .5rem; color: var(--text-muted); }
.cert-domain-links {
  display: flex; flex-wrap: wrap; gap: .35rem; align-items: center;
  font-size: .8rem; margin-bottom: .6rem;
}
.cert-domain-links span { color: var(--text-muted); }
.cert-domain-links a {
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: var(--radius-xs); padding: .12rem .5rem;
  color: var(--accent); text-decoration: none; font-size: .78rem;
}
.cert-domain-links a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.cert-coverage-bar {
  height: 7px; background: var(--border); border-radius: 4px; overflow: hidden;
}
.cert-coverage-fill {
  height: 100%; background: var(--accent); border-radius: 4px; font-size: 0;
}
.cert-cov-partial { background: #e67e22; }
.cert-cov-none    { background: var(--error-bdr); }

.cert-schedule { display: flex; flex-direction: column; gap: .45rem; margin: .75rem 0 1.25rem; }
.cert-week {
  display: flex; align-items: flex-start; gap: .75rem; padding: .5rem .85rem;
  background: var(--bg-secondary); border-radius: var(--radius-xs);
  border-left: 3px solid var(--accent); font-size: .88rem;
}
.cert-week-num {
  background: var(--accent); color: #fff; font-size: .73rem; font-weight: 700;
  padding: .12rem .4rem; border-radius: var(--radius-xs); white-space: nowrap; flex-shrink: 0;
}

.cert-gap-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem; margin-bottom: 1.25rem;
}
.cert-gap-box { border-radius: var(--radius-sm); padding: 1rem 1.25rem; border: 1px solid var(--border); }
.cert-gap-covered { border-color: #2ecc71; background: rgba(46,204,113,.07); }
.cert-gap-missing { border-color: #e67e22; background: rgba(230,126,34,.07); }
.cert-gap-box h4 { margin: 0 0 .5rem; font-size: .92rem; color: var(--text-primary); }
.cert-gap-box ul { padding-left: 1.2rem; margin: 0; font-size: .85rem; color: var(--text-secondary); }
.cert-gap-box li { margin-bottom: .22rem; }