:root {
  --primary: #1e3a8a;
  --primary-light: #2563eb;
  --primary-dark: #172554;
  --accent: #0284c7;
  --accent-light: #38bdf8;
  --accent-glow: rgba(2, 132, 199, 0.15);
  --bg: #f8fafc;
  --card: #ffffff;
  --card-hover: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --kw-bg: #fee2e2;
  --kw-text: #991b1b;
  --kw-border: #fecaca;
  --success-bg: #f0fdf4;
  --success-text: #166534;
  --success-border: #bbf7d0;
  --warning-bg: #fffbeb;
  --warning-text: #92400e;
  --warning-border: #fde68a;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* NAVBAR - 100% UNIFIED */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--primary);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(30, 58, 138, 0.25);
}

.brand-tag {
  font-size: 0.7rem;
  background: #e0e7ff;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 700;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: #eff6ff;
}

.badge-live {
  font-size: 0.65rem;
  background: #10b981;
  color: white;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-soon {
  font-size: 0.65rem;
  background: #e2e8f0;
  color: #64748b;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: 700;
  text-transform: uppercase;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-nav-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: white;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-nav-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

.btn-nav-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-nav-outline:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

/* MAIN CONTAINER */
.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* HERO SECTION */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0369a1 100%);
  color: white;
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  margin-bottom: 30px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero-pattern {
  position: absolute;
  top: -50px;
  right: -50px;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.2) 0%, rgba(255, 255, 255, 0) 70%);
  pointer-events: none;
}

.hero-badge-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 1.05rem;
  color: #e2e8f0;
  max-width: 720px;
  margin-bottom: 18px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: #cbd5e1;
}

.stat-icon {
  color: #38bdf8;
  font-size: 1rem;
}

/* FEATURED MODULE SPOTLIGHT CARD (ON HUB HOME) */
.featured-spotlight {
  background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
  border: 2px solid #86efac;
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.spotlight-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #22c55e;
  color: white;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.spotlight-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.spotlight-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.spotlight-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  max-width: 650px;
  line-height: 1.55;
}

.spotlight-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.spotlight-tag-item {
  background: white;
  border: 1px solid #bbf7d0;
  color: #166534;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.btn-launch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: white;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(30, 58, 138, 0.25);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-launch:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(30, 58, 138, 0.35);
}

/* SUBJECT PLACEHOLDER DIRECTORY GRIDS */
.subject-section {
  margin-bottom: 36px;
}

.subject-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

.subject-icon {
  font-size: 1.4rem;
}

.subject-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
}

.subject-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-left: auto;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.hub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
  position: relative;
}

.hub-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.hub-card.placeholder {
  background: #f8fafc;
  border-style: dashed;
}

.hub-card.placeholder:hover {
  border-color: var(--border);
  transform: none;
  box-shadow: none;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 6px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 14px;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
  font-size: 0.82rem;
  font-weight: 600;
}

.card-link-active {
  color: var(--primary-light);
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-link-placeholder {
  color: var(--text-sub);
}

/* SECTION CARDS (ON PRACTICAL PAGE) */
.section-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 28px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.section-card:hover {
  box-shadow: var(--shadow-md);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 14px;
  margin-bottom: 22px;
}

.section-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.3px;
}

.section-subtitle {
  font-size: 0.88rem;
  color: var(--text-sub);
  font-weight: 500;
}

.filter-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-btn {
  background: #f1f5f9;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--primary-light);
  color: white;
  border-color: var(--primary-light);
}

/* STEP FLOW VISUAL CARDS */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  background: #fafcff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  align-items: stretch;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.step-row:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.step-diagram {
  background: linear-gradient(180deg, #f1f5f9 0%, #e2e8f0 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  min-height: 190px;
  position: relative;
  border-right: 1px solid var(--border);
}

.step-diagram svg {
  width: 100%;
  max-width: 190px;
  height: 145px;
  transition: transform 0.2s ease;
}

.step-row:hover .step-diagram svg {
  transform: scale(1.03);
}

.step-content {
  padding: 20px 24px 20px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

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

.step-tag {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  background: #dbeafe;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
}

.step-apparatus {
  font-size: 0.78rem;
  color: var(--text-sub);
}

.step-heading {
  font-size: 1.18rem;
  font-weight: 750;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.step-instructions {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.55;
}

.keyword-pill {
  background: var(--kw-bg);
  color: var(--kw-text);
  border: 1px solid var(--kw-border);
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.86rem;
  display: inline-block;
}

.why-box {
  font-size: 0.88rem;
  background: var(--success-bg);
  border-left: 3.5px solid #22c55e;
  border-top: 1px solid var(--success-border);
  border-right: 1px solid var(--success-border);
  border-bottom: 1px solid var(--success-border);
  padding: 8px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--success-text);
  line-height: 1.45;
}

.why-box strong {
  color: #14532d;
}

/* CAUTION / TRAP BOX */
.trap-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-left: 4px solid #f59e0b;
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 24px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.trap-icon {
  font-size: 1.3rem;
  color: #b45309;
}

.trap-title {
  font-weight: 700;
  color: #78350f;
  margin-bottom: 2px;
  font-size: 0.95rem;
}

.trap-desc {
  font-size: 0.88rem;
  color: #92400e;
}

/* COMPARISON TABLE */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: white;
}

th, td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: #f1f5f9;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

tr:hover td {
  background: #f8fafc;
}

.method-tag {
  display: inline-block;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  margin-bottom: 4px;
}

.tag-evap {
  background: #fef3c7;
  color: #92400e;
}

.tag-cryst {
  background: #dbeafe;
  color: #1e40af;
}

/* QA INTERACTIVE ACCORDIONS / GRID */
.qa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}

.qa-card {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: all 0.2s ease;
  cursor: pointer;
  position: relative;
}

.qa-card:hover {
  background: white;
  border-color: #93c5fd;
  box-shadow: var(--shadow-sm);
}

.qa-card.open {
  background: white;
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
}

.qa-card .q {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.qa-card .toggle-icon {
  font-size: 0.8rem;
  color: var(--text-sub);
  transition: transform 0.2s ease;
}

.qa-card.open .toggle-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.qa-card .a {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
  font-size: 0.9rem;
  color: #334155;
  line-height: 1.5;
  display: none;
}

.qa-card.open .a {
  display: block;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   FULL-ON INTERACTIVE QUIZ SECTION (CRYSTALLISATION MASTERY)
   ========================================================= */
.quiz-section {
  background: #ffffff;
  border: 2px solid #bae6fd;
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-top: 36px;
  box-shadow: var(--shadow-md);
}

.quiz-main-header {
  border-bottom: 2px solid #e0f2fe;
  padding-bottom: 16px;
  margin-bottom: 22px;
}

.quiz-badge {
  display: inline-block;
  background: #e0f2fe;
  color: #0369a1;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.quiz-main-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.quiz-progress-track {
  flex-grow: 1;
  min-width: 180px;
  height: 8px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #2563eb);
  transition: width 0.3s ease;
}

.quiz-score-badge {
  font-size: 0.9rem;
  font-weight: 750;
  color: var(--primary);
  background: #eff6ff;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid #bfdbfe;
}

.quiz-question-card {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  margin-bottom: 18px;
  transition: all 0.2s ease;
}

.quiz-question-card.active {
  background: #ffffff;
  border-color: #93c5fd;
  box-shadow: var(--shadow-sm);
}

.q-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.q-number {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.q-topic {
  font-size: 0.75rem;
  color: var(--text-sub);
  background: #f1f5f9;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.q-prompt {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.5;
}

.q-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.q-opt-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: #ffffff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.92rem;
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1.45;
}

.q-opt-btn:hover:not(:disabled) {
  background: #f0f9ff;
  border-color: #38bdf8;
  transform: translateX(2px);
}

.q-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #f1f5f9;
  color: var(--text-muted);
  font-weight: 800;
  font-size: 0.78rem;
  flex-shrink: 0;
}

.q-opt-btn.correct {
  background: #f0fdf4 !important;
  border-color: #22c55e !important;
  color: #15803d !important;
}

.q-opt-btn.correct .q-opt-letter {
  background: #22c55e;
  color: white;
}

.q-opt-btn.incorrect {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
  color: #991b1b !important;
}

.q-opt-btn.incorrect .q-opt-letter {
  background: #ef4444;
  color: white;
}

.q-opt-btn:disabled {
  cursor: default;
}

.q-feedback-box {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
  display: none;
  animation: fadeIn 0.25s ease;
}

.q-feedback-box.correct {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-left: 4px solid #22c55e;
  color: #166534;
}

.q-feedback-box.incorrect {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-left: 4px solid #ef4444;
  color: #991b1b;
}

/* RESULTS SUMMARY CARD */
.quiz-results-card {
  display: none;
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: white;
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  margin-top: 24px;
  animation: fadeIn 0.3s ease;
}

.results-score-circle {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 4px solid #38bdf8;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  background: rgba(255, 255, 255, 0.1);
}

.results-pct {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
}

.results-fraction {
  font-size: 0.78rem;
  color: #cbd5e1;
}

.results-heading {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.results-feedback-msg {
  font-size: 0.95rem;
  color: #e2e8f0;
  max-width: 500px;
  margin: 0 auto 20px;
}

.btn-retake {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #38bdf8;
  color: #0f172a;
  font-weight: 750;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.btn-retake:hover {
  background: #7dd3fc;
  transform: translateY(-2px);
}

/* FOOTER */
footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 36px 20px;
  text-align: center;
  font-size: 0.88rem;
  border-top: 1px solid #1e293b;
  margin-top: 40px;
}

footer a {
  color: #38bdf8;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

/* RESPONSIVE DESIGN */
@media (max-width: 860px) {
  .nav-links {
    display: none;
  }

  .spotlight-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .step-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .step-diagram {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 20px 16px;
  }

  .step-content {
    padding: 18px;
  }

  .hero {
    padding: 26px 20px;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .section-card {
    padding: 20px 16px;
  }

  .quiz-section {
    padding: 20px 16px;
  }
}

/* PRINT STYLES */
@media print {
  .navbar, .btn-nav-primary, .btn-nav-outline, .btn-launch, .filter-group, .quiz-section, footer {
    display: none !important;
  }

  body {
    background: white;
    color: black;
    padding: 0;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  .hero {
    background: #1e3a8a !important;
    color: white !important;
    padding: 16px;
    margin-bottom: 16px;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .section-card {
    border: 1px solid #ccc;
    box-shadow: none;
    padding: 14px;
    margin-bottom: 16px;
    page-break-inside: avoid;
  }

  .step-row {
    background: #fff;
    border: 1px solid #ddd;
    page-break-inside: avoid;
    margin-bottom: 10px;
  }

  .step-diagram {
    background: #f5f5f5 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .qa-card .a {
    display: block !important;
  }
}