/* ============================================================
   chem-y12-m8-theme.css — Chemistry Year 12 Module 8
   Palette: Sky blue / indigo / cyan (Phase F)
   ============================================================ */
:root {
  --primary:       #38bdf8;
  --primary-mid:   #0ea5e9;
  --primary-light: rgba(56, 189, 248, 0.12);
  --accent:        #818cf8;
  --accent-dark:   #6366f1;
  --accent-light:  rgba(129, 140, 248, 0.12);
  --accent-bg:     rgba(255, 255, 255, 0.88);
  --surface:       rgba(255, 255, 255, 0.96);
  --surface-solid: #ffffff;
  --mesh-1: #e0f2fe;
  --mesh-2: #e0e7ff;
  --mesh-3: #f0f9ff;
  --mesh-gradient: radial-gradient(ellipse at 20% 20%, var(--mesh-1) 0%, transparent 55%),
                   radial-gradient(ellipse at 80% 80%, var(--mesh-2) 0%, transparent 55%),
                   radial-gradient(ellipse at 50% 50%, var(--mesh-3) 0%, transparent 70%),
                   #f8fafc;
  --h2-color:      var(--heading-color);
  --shadow-accent: 0 4px 20px var(--accent-light);
  /* M8-specific extras */
  --secondary:        #6366f1;
  --secondary-light:  rgba(99, 102, 241, 0.09);
  --hero-gradient:    linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
}

body {
  background: radial-gradient(ellipse at 10% 20%, rgba(186,230,255,0.9) 0%, transparent 55%),
              radial-gradient(ellipse at 85% 10%, rgba(186,210,255,0.85) 0%, transparent 50%),
              radial-gradient(ellipse at 60% 80%, rgba(186,230,255,0.8) 0%, transparent 50%),
              linear-gradient(155deg, #e0f2fe 0%, #dbeafe 40%, #e0e7ff 75%, #f0f9ff 100%);
  min-height: 100vh;
}

body {
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  background: var(--bg);
  color: var(--text);
}

h1,
h2,
h3,
h4 {
  font-family: "Roboto Slab", Georgia, serif;
}

code,
.mono,
.formula-eq,
.formula-row,
.step-body .equation-line,
.table-wrap table {
  font-family: "DM Mono", monospace;
}

.page {
  max-width: 980px;
  width: calc(100% - 36px);
}

.cp-container {
  max-width: 980px;
  width: calc(100% - 36px);
  margin: 0 auto 80px;
}

.hero {
  background: var(--hero-gradient);
  border: none;
  box-shadow: var(--shadow);
}

.hero--assessment {
  color: #ffffff;
  padding: 44px 40px;
}

.hero::after {
  display: none;
}

.hero h1,
.hero-desc {
  color: #ffffff;
}

.hero-emoji {
  font-size: 72px;
  opacity: 0.85;
}

.hero-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.hbadge {
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hbadge-solid {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

.hbadge-outline {
  border: 1.5px solid rgba(255, 255, 255, 0.42);
  color: rgba(255, 255, 255, 0.96);
  background: transparent;
}

.think-first {
  background: linear-gradient(135deg, #14213d 0%, #3730a3 100%);
  border-radius: var(--radius);
  padding: 30px 32px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.tf-label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.think-first h2,
.think-first p,
.think-first li {
  color: rgba(255, 255, 255, 0.92);
}

.think-first h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.think-first ul {
  padding-left: 20px;
  margin: 10px 0 16px;
}

.think-first .answer-textarea {
  background: rgba(255, 255, 255, 0.1);
  border: 1.5px solid rgba(255, 255, 255, 0.28);
  color: #ffffff;
}

.think-first .answer-textarea::placeholder,
.think-first .autosave-indicator {
  color: rgba(255, 255, 255, 0.62);
}

.intentions-grid {
  gap: 14px;
}

.intention-card {
  border-top-width: 4px;
}

.intention-card h3 {
  font-size: 14px;
}

.intention-card li {
  font-size: 14px;
}

.card {
  box-shadow: var(--shadow-sm);
}

.coverage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.coverage-tile {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-top: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.ct-num {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 6px;
}

.ct-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.ct-points {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ct-points li {
  position: relative;
  padding: 4px 0 4px 14px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.ct-points li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

.q-num {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 8px;
}

.card h2 {
  color: var(--text);
}

.card p,
.card li {
  font-size: 15px;
}

.card ul,
.card ol {
  padding-left: 22px;
  margin: 8px 0 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

.conceptual-first {
  font-size: 16px;
  color: var(--primary);
  font-style: italic;
  line-height: 1.7;
  margin-bottom: 18px;
  padding-left: 16px;
  border-left: 3px solid var(--primary);
}

.table-wrap,
.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin: 16px 0;
}

.table-wrap table,
.data-table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table-wrap th,
.data-table-wrap th {
  background: var(--surface-2);
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.table-wrap td,
.data-table-wrap td {
  font-size: 14px;
}

.formula-panel {
  background: #10243e;
  color: #ffffff;
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 24px 0;
}

.diagram-wrap {
  margin: 20px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(180deg, #f9fffd 0%, #effcf8 100%);
  box-shadow: var(--shadow-sm);
}

.diagram-wrap svg {
  display: block;
  width: 100%;
  height: auto;
}

.diagram-caption {
  margin: 0;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.82);
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.formula-panel h3 {
  color: #ffffff;
  margin-top: 0;
  margin-bottom: 14px;
}

.formula-row {
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 10px 0;
  font-size: 14px;
  line-height: 1.8;
}

.formula-eq {
  display: block;
  color: #fcd34d;
  font-size: 15px;
  margin-bottom: 6px;
}

.worked-example {
  background: #ffffff;
  border: 2px solid var(--secondary);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}

.we-label {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--secondary);
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.worked-example h3 {
  font-size: 19px;
  margin: 0 0 14px;
}

.worked-step {
  display: flex;
  gap: 14px;
  margin: 14px 0;
}

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--secondary);
  color: #ffffff;
  font-size: 13px;
  font-weight: 800;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-body {
  flex: 1;
}

.step-body p {
  margin-bottom: 6px;
}

.equation-line {
  display: block;
  margin: 6px 0;
  color: var(--secondary);
  font-size: 14px;
}

.we-answer {
  margin-top: 14px;
  padding: 14px 18px;
  border-left: 3px solid var(--secondary);
  background: var(--secondary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.callout-anchor {
  background: var(--accent-2-light);
  border-left-color: var(--accent-2);
}

.callout-anchor .callout-tag {
  background: var(--accent-2);
  color: #ffffff;
}

.question-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.bloom-badge,
.band-badge,
.marks {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.bloom-understand {
  background: #dbeafe;
  color: #1d4ed8;
}

.bloom-apply {
  background: #dcfce7;
  color: #166534;
}

.bloom-analyse {
  background: #ede9fe;
  color: #5b21b6;
}

.bloom-evaluate {
  background: #fef3c7;
  color: #92400e;
}

.band-3 {
  background: #e0f2fe;
  color: #0369a1;
}

.band-4 {
  background: #dcfce7;
  color: #166534;
}

.band-5 {
  background: #ede9fe;
  color: #5b21b6;
}

.band-6 {
  background: #fef3c7;
  color: #92400e;
}

.marks {
  background: var(--primary-light);
  color: var(--primary);
}

.drill-item {
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.drill-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.drill-num {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  margin-right: 6px;
  background: var(--primary);
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
}

.revisit-box {
  background: linear-gradient(135deg, #0f172a 0%, #0f766e 100%);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin: 24px 0;
}

.revisit-box h3,
.revisit-box p,
.revisit-box li {
  color: rgba(255, 255, 255, 0.92);
}

.revisit-box ul {
  padding-left: 20px;
  margin: 12px 0;
}

.revisit-box .answer-textarea {
  background: rgba(255, 255, 255, 0.1);
  border: 1.5px solid rgba(255, 255, 255, 0.28);
  color: #ffffff;
}

.revisit-box .answer-textarea::placeholder,
.revisit-box .autosave-indicator {
  color: rgba(255, 255, 255, 0.62);
}

.lesson-nav a.next {
  background: var(--primary);
  border-color: var(--primary);
}

.lesson-nav a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.lesson-nav a.next:hover {
  color: #ffffff;
  background: #0f766e;
}

.textarea-h-90 {
  min-height: 90px;
}

.textarea-h-100 {
  min-height: 100px;
}

.textarea-h-120 {
  min-height: 120px;
}

.textarea-h-150 {
  min-height: 150px;
}

@media (max-width: 720px) {
  .page {
    width: calc(100% - 24px);
  }

  .hero {
    padding: 28px 22px;
  }

  .hero-top {
    flex-direction: column;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-emoji {
    display: none;
  }

  .think-first,
  .card,
  .activity,
  .worked-example,
  .revisit-box {
    padding-left: 20px;
    padding-right: 20px;
  }

  .copy-grid,
  .intentions-grid {
    grid-template-columns: 1fr;
  }
}