/* ================================================
   Sales Training Simulator - Styles
   Industrial Integrity Agents.AI
   Dark professional theme: #0a0a0a bg, #1a1a2e cards, cyan/teal accents
   ================================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --bg-sidebar: #0d0d1a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #1e1e35;
  --bg-elevated: #232340;
  --cyan: #00d4d4;
  --cyan-dim: rgba(0, 212, 212, 0.12);
  --cyan-glow: rgba(0, 212, 212, 0.25);
  --teal: #2dd4bf;
  --teal-dim: rgba(45, 212, 191, 0.12);
  --amber: #f59e0b;
  --amber-dim: rgba(245, 158, 11, 0.12);
  --blue: #3b82f6;
  --blue-dim: rgba(59, 130, 246, 0.12);
  --green: #10b981;
  --green-dim: rgba(16, 185, 129, 0.12);
  --red: #ef4444;
  --red-dim: rgba(239, 68, 68, 0.12);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border: rgba(255,255,255,0.08);
  --border-active: rgba(0, 212, 212, 0.4);
  --radius: 8px;
  --radius-lg: 12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ── TOP BAR ── */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: rgba(10,10,10,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  z-index: 100;
  gap: 1rem;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--cyan);
  white-space: nowrap;
  text-decoration: none;
}

.topbar-brand .logo-icon {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--cyan), var(--teal));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #000;
  font-weight: 900;
  flex-shrink: 0;
}

.topbar-title {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.topbar-back {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
  white-space: nowrap;
}
.topbar-back:hover {
  border-color: var(--border-active);
  color: var(--cyan);
}

/* ── PROGRESS BAR ── */
.progress-bar-wrap {
  position: fixed;
  top: 56px; left: 0; right: 0;
  height: 3px;
  background: rgba(255,255,255,0.05);
  z-index: 99;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--teal));
  transition: width 0.5s ease;
  box-shadow: 0 0 8px var(--cyan-glow);
}

/* ── LAYOUT ── */
.app-container {
  display: flex;
  padding-top: 59px; /* topbar + progress bar */
  min-height: 100vh;
}

/* ── SIDEBAR ── */
.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 59px; bottom: 0; left: 0;
  overflow-y: auto;
  padding: 1rem 0;
}

.sidebar-section-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  padding: 0.5rem 1.2rem 0.3rem;
}

.sidebar-module {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.2rem;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.2s;
  position: relative;
}

.sidebar-module:hover {
  background: rgba(0,212,212,0.05);
  color: var(--text);
}

.sidebar-module.active {
  background: rgba(0,212,212,0.08);
  border-left-color: var(--cyan);
  color: var(--cyan);
}

.sidebar-module.completed .module-num {
  background: var(--green);
  color: #000;
}

.module-num {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
}

.sidebar-module.active .module-num {
  background: var(--cyan);
  color: #000;
  border-color: var(--cyan);
}

.module-label {
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.3;
  color: inherit;
}

.module-badge {
  margin-left: auto;
  font-size: 0.6rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-weight: 700;
  flex-shrink: 0;
}

.badge-live { background: var(--green-dim); color: var(--green); border: 1px solid rgba(16,185,129,0.3); }
.badge-soon { background: rgba(255,255,255,0.05); color: var(--text-dim); border: 1px solid var(--border); }

/* ── MAIN CONTENT ── */
.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 2rem;
  max-width: 900px;
}

/* Module panels */
.module-panel {
  display: none;
}
.module-panel.active {
  display: block;
}

/* ── MODULE HEADER ── */
.module-header {
  margin-bottom: 2rem;
}

.module-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin-bottom: 0.75rem;
  padding: 0.3rem 0.75rem;
  background: var(--cyan-dim);
  border-radius: 20px;
  border: 1px solid rgba(0,212,212,0.2);
}

.module-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.module-header .subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 600px;
}

.module-divider {
  height: 1px;
  background: var(--border);
  margin: 1.5rem 0;
}

/* ── SECTION HEADING ── */
.section-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-heading::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 1.1em;
  background: var(--cyan);
  border-radius: 2px;
}

/* ── THREE-LAYER CARDS ── */
.layer-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.layer-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}

.layer-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}

.layer-card.assistant::before { background: var(--text-dim); }
.layer-card.copilot::before { background: var(--blue); }
.layer-card.agent::before { background: linear-gradient(90deg, var(--cyan), var(--teal)); }

.layer-card .layer-num {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.layer-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.layer-card.assistant h3 { color: var(--text-muted); }
.layer-card.copilot h3 { color: var(--blue); }
.layer-card.agent h3 { color: var(--cyan); }

.layer-card .layer-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.layer-card .layer-key {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  display: inline-block;
}

.layer-card.assistant .layer-key { background: rgba(255,255,255,0.05); color: var(--text-dim); }
.layer-card.copilot .layer-key { background: var(--blue-dim); color: var(--blue); }
.layer-card.agent .layer-key { background: var(--cyan-dim); color: var(--cyan); }

.layer-card .layer-examples {
  margin-top: 0.75rem;
  font-size: 0.72rem;
  color: var(--text-dim);
}

.layer-card .layer-examples span {
  display: inline-block;
  margin-right: 0.4rem;
  padding: 0.2rem 0.5rem;
  background: rgba(255,255,255,0.04);
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  margin-top: 0.3rem;
}

/* ── CALLOUT BOXES ── */
.callout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.callout {
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid;
}

.callout-stat {
  background: var(--teal-dim);
  border-color: rgba(45, 212, 191, 0.25);
}

.callout-warning {
  background: var(--amber-dim);
  border-color: rgba(245, 158, 11, 0.25);
}

.callout-discovery {
  background: var(--blue-dim);
  border-color: rgba(59, 130, 246, 0.25);
}

.callout-label {
  font-size: 0.62rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.callout-stat .callout-label { color: var(--teal); }
.callout-warning .callout-label { color: var(--amber); }
.callout-discovery .callout-label { color: var(--blue); }

.callout .callout-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.15rem;
}

.callout .callout-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ── EXPANDABLE CARDS ── */
.expandable-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.expandable-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}

.expandable-item:hover {
  border-color: rgba(0,212,212,0.2);
}

.expandable-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.2rem;
  cursor: pointer;
  gap: 1rem;
}

.expandable-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.flag-num {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--red-dim);
  border: 1px solid rgba(239,68,68,0.3);
  color: var(--red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-num {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,212,0.3);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.objection-num {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--amber-dim);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--amber);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.expandable-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.expandable-chevron {
  color: var(--text-dim);
  font-size: 0.75rem;
  transition: transform 0.2s;
  flex-shrink: 0;
}

.expandable-item.open .expandable-chevron {
  transform: rotate(180deg);
  color: var(--cyan);
}

.expandable-body {
  display: none;
  padding: 0 1.2rem 1rem;
  border-top: 1px solid var(--border);
}

.expandable-item.open .expandable-body {
  display: block;
}

.expandable-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 0.75rem;
}

.expandable-body .tell-tale {
  margin-top: 0.75rem;
  padding: 0.6rem 0.9rem;
  background: var(--red-dim);
  border-left: 3px solid var(--red);
  border-radius: 0 6px 6px 0;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.expandable-body .tell-tale strong { color: var(--red); }

.expandable-body .response-script {
  margin-top: 0.75rem;
  padding: 0.75rem 0.9rem;
  background: var(--green-dim);
  border-left: 3px solid var(--green);
  border-radius: 0 6px 6px 0;
  font-size: 0.82rem;
  color: var(--text);
  font-style: italic;
  line-height: 1.6;
}

.expandable-body .why-works {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  padding-left: 0.5rem;
}

/* ── TABLES ── */
.data-table-wrap {
  overflow-x: auto;
  margin-bottom: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.data-table th {
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
  line-height: 1.5;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: rgba(0,212,212,0.03);
}

.data-table .role-name {
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

.data-table .red-flag-cell {
  color: var(--red);
  font-size: 0.75rem;
}

.data-table .concern-cell {
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* ── SCORING GRID ── */
.scoring-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.score-dim {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.score-dim .dim-name {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 0.4rem;
}

.score-dim .dim-range {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.score-dim .dim-lo {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-bottom: 0.15rem;
}
.score-dim .dim-hi {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* ── SCORE BANDS ── */
.score-bands {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.score-band {
  flex: 1;
  min-width: 140px;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid;
}

.score-band.strong { background: var(--green-dim); border-color: rgba(16,185,129,0.3); }
.score-band.moderate { background: var(--amber-dim); border-color: rgba(245,158,11,0.3); }
.score-band.not-ready { background: var(--red-dim); border-color: rgba(239,68,68,0.3); }

.score-band .band-range {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.15rem;
}
.score-band.strong .band-range { color: var(--green); }
.score-band.moderate .band-range { color: var(--amber); }
.score-band.not-ready .band-range { color: var(--red); }

.score-band .band-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text);
}
.score-band .band-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* ── FRAMEWORK BOX ── */
.framework-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.framework-box h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.framework-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.framework-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.framework-item .fi-label {
  width: 90px;
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--amber);
  padding: 0.3rem 0.5rem;
  background: var(--amber-dim);
  border-radius: 5px;
  text-align: center;
  margin-top: 0.1rem;
}

.framework-item .fi-content {
  flex: 1;
}

.framework-item .fi-question {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.framework-item .fi-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── DIFFERENCES GRID ── */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.diff-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.diff-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,212,0.3);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
}

.diff-content h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.diff-content p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── QUESTION BANK ── */
.question-bank {
  margin-bottom: 2rem;
}

.qbank-category {
  margin-bottom: 1rem;
}

.qbank-category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  transition: all 0.2s;
}

.qbank-category-header:hover {
  border-color: rgba(0,212,212,0.2);
}

.qbank-category.open .qbank-category-header {
  border-color: var(--border-active);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  color: var(--cyan);
}

.qbank-questions {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  border-top: none;
  border-bottom-left-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
  padding: 0.5rem 0;
}

.qbank-category.open .qbank-questions {
  display: block;
}

.qbank-question {
  padding: 0.65rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  line-height: 1.5;
}

.qbank-question:last-child {
  border-bottom: none;
}

.qbank-question::before {
  content: '→';
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* ── WHITEBOARD TEST ── */
.whiteboard-test {
  background: var(--bg-card);
  border: 1px solid var(--cyan-glow);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.whiteboard-test h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.whiteboard-test .challenge-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.whiteboard-test .prompt-box {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  font-size: 0.85rem;
  color: var(--teal);
  font-family: 'JetBrains Mono', monospace;
  font-style: italic;
  line-height: 1.6;
}

.whiteboard-test .prompt-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.whiteboard-test .good-answers {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--green-dim);
  border-left: 3px solid var(--green);
  border-radius: 0 6px 6px 0;
}

.whiteboard-test .good-answers strong {
  color: var(--green);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.whiteboard-test .good-answers ul {
  margin-top: 0.4rem;
  padding-left: 1.2rem;
}

.whiteboard-test .good-answers li {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

/* ── PLACEHOLDER MODULE ── */
.placeholder-panel {
  text-align: center;
  padding: 4rem 2rem;
}

.placeholder-panel .ph-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.placeholder-panel h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.placeholder-panel .ph-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.placeholder-panel .ph-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ── COMPLETE BTN ── */
.mark-complete-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  background: linear-gradient(135deg, var(--cyan), var(--teal));
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 2rem;
}

.mark-complete-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--cyan-glow);
}

.mark-complete-btn.done {
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid rgba(16,185,129,0.3);
}

/* ── MOBILE ── */
.sidebar-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
}

@media (max-width: 768px) {
  .sidebar-toggle { display: flex; align-items: center; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s;
    z-index: 50;
    width: 260px;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding: 1.25rem;
  }

  .layer-cards {
    grid-template-columns: 1fr;
  }

  .scoring-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .diff-grid {
    grid-template-columns: 1fr;
  }

  .module-header h1 {
    font-size: 1.4rem;
  }

  .overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 40;
  }

  .overlay.show {
    display: block;
  }
}

@media (max-width: 480px) {
  .scoring-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .callout-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}