/* ═══════════════════════════════════════════════════
   Mitra AI Projects — Main Stylesheet
   Design: Plum Emerald Academic — white, plum/purple, emerald green
   ═══════════════════════════════════════════════════ */

/* ── Variables ── */
:root {
  --primary:    #6b21a8;
  --primary-dim:#7c3aed;
  --bg-dark:    #ffffff;
  --surface:    #faf5ff;
  --surface-2:  #f3e8ff;
  --accent:     #059669;
  --text:       #1a0533;
  --muted:      #6b4f88;
  --border:     rgba(107,33,168,0.14);
  --border-dim: rgba(0,0,0,0.08);
  --purple:     #7c3aed;
  --danger:     #dc2626;
  --success:    #059669;
  --nav-h:      64px;
  --radius:     8px;
  --radius-lg:  14px;
  --shadow:     0 4px 24px rgba(0,0,0,0.10);
  --shadow-lg:  0 8px 48px rgba(0,0,0,0.15);
  --transition: 0.18s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Nunito', system-ui, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dim); }
ul, ol { list-style: none; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Baloo 2', system-ui, sans-serif;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }
p { color: var(--muted); }
code, .mono {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
}
.text-muted { color: var(--muted); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-center { text-align: center; }

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.container-wide {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.section { padding: 4.5rem 0; }
.section-sm { padding: 2.5rem 0; }
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dim);
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-family: 'Baloo 2', sans-serif;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav-logo {
  width: 34px;
  height: 34px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 800;
}
.nav-brand:hover { color: var(--text); }
.teal { color: var(--primary); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}
.nav-links li a {
  color: var(--muted);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.nav-links li a:hover,
.nav-links li a.active {
  color: var(--text);
  background: var(--border-dim);
}
.nav-auth { display: flex; align-items: center; gap: 0.5rem; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
  margin-left: auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.925rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.btn-primary {
  background: var(--primary);
  color: #ffffff;
}
.btn-primary:hover {
  background: var(--primary-dim);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(107,33,168,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover {
  background: rgba(107,33,168,0.08);
  color: var(--primary);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1.5px solid var(--border-dim);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface);
}
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
.btn-xl { padding: 1rem 2.5rem; font-size: 1.05rem; }

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.badge-primary { background: rgba(107,33,168,0.1); color: var(--primary); border: 1px solid rgba(107,33,168,0.2); }
.badge-accent  { background: rgba(5,150,105,0.1);  color: var(--accent);  border: 1px solid rgba(5,150,105,0.2); }
.badge-purple  { background: rgba(124,58,237,0.1); color: var(--purple);  border: 1px solid rgba(124,58,237,0.2); }
.badge-muted   { background: rgba(0,0,0,0.04);     color: var(--muted);   border: 1px solid var(--border-dim); }
.badge-success { background: rgba(5,150,105,0.1);  color: var(--success); border: 1px solid rgba(5,150,105,0.2); }
.badge-danger  { background: rgba(220,38,38,0.1);  color: var(--danger);  border: 1px solid rgba(220,38,38,0.2); }
.badge-dot::before { content: '●'; font-size: 0.5rem; vertical-align: middle; }

/* ── Hero ── */
.hero {
  background: linear-gradient(160deg, #faf5ff 0%, #f3e8ff 40%, #ffffff 80%);
  padding: 5.5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 20% 60%, rgba(107,33,168,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 80% 30%, rgba(5,150,105,0.04) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hero-title { margin-bottom: 0.75rem; }
.hero-title em {
  font-style: normal;
  color: var(--primary);
}
.hero-tagline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.15em;
  margin-bottom: 1.25rem;
  opacity: 0.85;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 620px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero-cta-block { display: flex; flex-direction: column; gap: 1.25rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-sneak {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.sneak-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  background: rgba(107,33,168,0.07);
  border: 1px solid rgba(107,33,168,0.18);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text);
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.sneak-chip:hover {
  background: rgba(107,33,168,0.13);
  border-color: rgba(107,33,168,0.35);
  color: var(--primary);
}
/* Lane filter cards */
.lane-card {
  text-decoration: none;
  cursor: pointer;
  text-align: left;
  padding: 1.75rem 1.5rem;
}
.lane-card:hover { transform: translateY(-3px); }
.lane-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.lane-card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; color: var(--text); }
.lane-card p { font-size: 0.82rem; color: var(--muted); line-height: 1.55; margin-bottom: 0.9rem; }
.lane-card .lane-cta { font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; color: var(--primary); }

/* ── Trust strip ── */
.trust-strip {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  padding: 1.25rem 0;
  border-top: 1px solid var(--border-dim);
  margin-top: 3rem;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}
.trust-item .icon { color: var(--primary); font-size: 1rem; }

/* ── Cards ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: var(--border);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(107,33,168,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}
.card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.35rem; }
.card-desc { font-size: 0.88rem; color: var(--muted); line-height: 1.55; }
.card-footer {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.card-meta { font-size: 0.78rem; color: var(--muted); font-family: 'JetBrains Mono', monospace; }

/* Course track card accent line */
.card-track::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary);
  opacity: 0;
  transition: opacity var(--transition);
}
.card-track:hover::before { opacity: 1; }

/* ── Section headers ── */
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header h2 { margin-bottom: 0.75rem; }
.section-header p { color: var(--muted); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }
.section-tag {
  font-family: 'JetBrains Mono', monospace;
  color: var(--primary);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

/* ── Tab layout (standard) ── */
.tab-layout { display: flex; gap: 0; flex-direction: column; }
.tab-nav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding-bottom: 0;
  border-bottom: 2px solid var(--border-dim);
  scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-btn {
  flex-shrink: 0;
  padding: 0.6rem 1.1rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition);
  font-family: 'JetBrains Mono', monospace;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
.tab-panel { display: none; padding: 2rem 0; }
.tab-panel.active { display: block; }

/* ── OneNote layout (ml.html) ── */
.onenote-wrap {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: calc(100vh - var(--nav-h));
  overflow: hidden;
}
.onenote-sidebar {
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border-dim);
  padding: 1rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.onenote-sidebar::-webkit-scrollbar { width: 4px; }
.onenote-sidebar::-webkit-scrollbar-track { background: transparent; }
.onenote-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.onenote-sidebar-header {
  padding: 0.75rem 1.25rem 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-dim);
  margin-bottom: 0.5rem;
}
.onenote-tab {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 600;
}
.onenote-tab:hover { color: var(--text); background: rgba(107,33,168,0.04); }
.onenote-tab.active {
  color: var(--primary);
  background: rgba(107,33,168,0.08);
  border-left-color: var(--primary);
}
.onenote-tab-icon { font-size: 1rem; width: 20px; flex-shrink: 0; }
.onenote-tab-badge {
  margin-left: auto;
  font-size: 0.65rem;
  background: rgba(107,33,168,0.1);
  color: var(--primary);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
}
.onenote-content {
  overflow-y: auto;
  padding: 2.25rem 2.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.onenote-content::-webkit-scrollbar { width: 6px; }
.onenote-content::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.onenote-panel { display: none; }
.onenote-panel.active { display: block; }
.onenote-mobile-select { display: none; width: 100%; }

/* ── Topic content styles ── */
.topic-hero { margin-bottom: 2.5rem; }
.topic-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.topic-hero h2 { margin-bottom: 0.75rem; }
.topic-section { margin-bottom: 2rem; }
.topic-section h3 {
  color: var(--primary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.85rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-dim);
  font-family: 'JetBrains Mono', monospace;
}
.topic-section p, .topic-section li { font-size: 0.95rem; color: var(--text); opacity: 0.9; }
.topic-section ul { padding-left: 1.25rem; }
.topic-section ul li { list-style: disc; margin-bottom: 0.35rem; }

/* ── Metric table ── */
.metric-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.metric-table th {
  background: var(--surface-2);
  color: var(--primary);
  text-align: left;
  padding: 0.6rem 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-dim);
}
.metric-table td {
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--border-dim);
  color: var(--text);
  opacity: 0.9;
  vertical-align: top;
}
.metric-table tr:last-child td { border-bottom: none; }
.metric-table tr:hover td { background: rgba(107,33,168,0.03); }

/* ── Code panel ── */
.code-panel {
  background: #0d1117;
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1rem 0;
}
.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border-dim);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--muted);
}
.code-dots { display: flex; gap: 0.35rem; }
.code-dots span {
  width: 10px; height: 10px; border-radius: 50%;
}
.code-dot-red   { background: #f85149; }
.code-dot-amber { background: var(--accent); }
.code-dot-green { background: var(--success); }
.code-panel pre {
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.7;
  color: #e6edf3;
}
.code-panel code { font-family: 'JetBrains Mono', monospace; }
/* Syntax hints */
.kw { color: #ff7b72; }   /* keywords */
.fn { color: #d2a8ff; }   /* functions */
.st { color: #a5d6ff; }   /* strings */
.cm { color: #8b949e; }   /* comments */
.num{ color: #79c0ff; }   /* numbers */
.cl { color: #ffa657; }   /* classes */

/* ── Quiz ── */
.quiz-block {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 2rem 0;
}
.quiz-block h3 {
  margin-bottom: 1.25rem;
  color: var(--text);
  font-size: 1rem;
  font-family: 'JetBrains Mono', monospace;
}
.quiz-q { margin-bottom: 1.5rem; }
.quiz-q p { font-weight: 600; margin-bottom: 0.65rem; color: var(--text); font-size: 0.9rem; }
.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  margin-bottom: 0.35rem;
  cursor: pointer;
  transition: background var(--transition);
  font-size: 0.875rem;
}
.quiz-option:hover { background: rgba(107,33,168,0.06); }
.quiz-option input[type="radio"] { margin-top: 0.15rem; accent-color: var(--primary); }
.quiz-option.correct { background: rgba(63,185,80,0.1); color: var(--success); }
.quiz-option.wrong { background: rgba(248,81,73,0.1); color: var(--danger); }
.quiz-actions { margin-top: 1.25rem; display: flex; gap: 1rem; align-items: center; }
.quiz-result { font-size: 0.9rem; color: var(--muted); }
.quiz-result.pass { color: var(--success); }

/* ── Cheatsheet cards ── */
.cheatsheet-card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all var(--transition);
}
.cheatsheet-card:hover {
  border-color: var(--border);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.cheatsheet-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(107,33,168,0.12), rgba(107,33,168,0.05));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.cheatsheet-title { font-weight: 700; color: var(--text); }
.cheatsheet-desc { font-size: 0.85rem; color: var(--muted); }
.cheatsheet-actions { margin-top: auto; display: flex; gap: 0.5rem; }

/* ── Project hero ── */
.project-hero {
  background: linear-gradient(160deg, #faf5ff 0%, #f3e8ff 40%, #ffffff 80%);
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-dim);
}
.project-hero h1 { color: var(--text); }
.project-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.project-hero h1 { margin-bottom: 1rem; }
.project-hero p { color: var(--muted); max-width: 640px; margin-bottom: 1.5rem; }
.project-deliverables {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}
.deliverable-pill {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
}
.deliverable-pill::before { content: '✓ '; color: var(--success); }

/* ── Milestone card ── */
.milestone-card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  transition: all var(--transition);
}
.milestone-card:hover { border-color: var(--border); }
.milestone-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(107,33,168,0.1);
  border: 2px solid var(--primary);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.milestone-body h4 { margin-bottom: 0.35rem; }
.milestone-body p { font-size: 0.875rem; color: var(--muted); }
.milestone-body ul { padding-left: 1.25rem; margin-top: 0.5rem; }
.milestone-body ul li { list-style: disc; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.2rem; }
.milestone-tag {
  font-size: 0.72rem;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 0.35rem;
}

/* ── Viva questions ── */
.viva-block {
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 0.75rem;
}
.viva-q { font-weight: 700; color: var(--text); margin-bottom: 0.5rem; font-size: 0.9rem; }
.viva-a { font-size: 0.875rem; color: var(--muted); }

/* ── Architecture diagram placeholder ── */
.arch-diagram {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
}
.arch-boxes {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}
.arch-box {
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 1.1rem;
  font-size: 0.8rem;
  color: var(--primary);
}
.arch-arrow { color: var(--muted); font-size: 1.2rem; }

/* ── Contact form ── */
.contact-form {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
}
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
.form-control {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 0.65rem 0.9rem;
  color: var(--text);
  transition: border-color var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(107,33,168,0.1);
}
.form-control::placeholder { color: var(--muted); }
textarea.form-control { min-height: 120px; resize: vertical; }
.form-select {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 0.65rem 0.9rem;
  color: var(--text);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237d8590' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
}
.form-select:focus { outline: none; border-color: var(--primary); }

/* ── FAQ accordion ── */
.faq-item {
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 0.75rem;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--border); }
.faq-q {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.925rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-q:hover { background: var(--surface-2); }
.faq-chevron { color: var(--primary); transition: transform var(--transition); font-size: 1rem; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--surface-2);
}
.faq-item.open .faq-a { max-height: 500px; }
.faq-a-inner { padding: 0.85rem 1.25rem 1.1rem; font-size: 0.9rem; color: var(--muted); line-height: 1.65; }

/* ── CTA section ── */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  border-top: none;
  border-bottom: none;
  padding: 4rem 0;
  text-align: center;
  color: #fff;
}
.cta-section h2, .cta-section p { color: #fff; }
.cta-section p { opacity: 0.82; }
.cta-section h2 { margin-bottom: 0.75rem; }
.cta-section p { color: var(--muted); margin-bottom: 2rem; }

/* ── Chatbot widget ── */
.chat-widget {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
}
.chat-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--bg-dark);
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(107,33,168,0.4);
  transition: all var(--transition);
}
.chat-btn:hover { transform: scale(1.08); box-shadow: 0 6px 28px rgba(107,33,168,0.5); }

/* ── Completion banner ── */
.completion-banner {
  background: linear-gradient(135deg, rgba(107,33,168,0.1), rgba(124,58,237,0.08));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}
.completion-icon { font-size: 2.5rem; }
.completion-body h3 { color: var(--primary); margin-bottom: 0.25rem; }
.completion-body p { font-size: 0.875rem; color: var(--muted); }

/* ── Footer ── */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border-dim);
  padding: 3.5rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-brand { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.75rem; }
.footer-brand-name { font-family: 'Baloo 2', sans-serif; font-weight: 800; font-size: 1.05rem; }
.footer-tagline { font-size: 0.875rem; color: var(--muted); line-height: 1.55; }
.footer-col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.4rem; }
.footer-col ul a { font-size: 0.875rem; color: var(--muted); transition: color var(--transition); }
.footer-col ul a:hover { color: var(--text); }
.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.footer-legal { display: flex; gap: 1.25rem; }
.footer-legal a { color: var(--muted); }
.footer-legal a:hover { color: var(--text); }

/* ── Notification banner ── */
.page-banner {
  background: rgba(107,33,168,0.07);
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}
.page-banner a { color: var(--primary); font-weight: 600; }

/* ── Breadcrumb ── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { color: var(--border-dim); font-size: 0.7rem; }

/* ── How it works steps ── */
.step-card {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  text-align: center;
  transition: all var(--transition);
}
.step-card:hover { border-color: var(--border); transform: translateY(-2px); }
.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(107,33,168,0.1);
  border: 2px solid var(--primary);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1rem;
  margin: 0 auto 1rem;
}
.step-icon { font-size: 2rem; margin-bottom: 0.75rem; }

/* ── AI Prompt box ── */
.ai-prompts {
  background: var(--surface-2);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem;
  margin: 1rem 0;
}
.ai-prompts h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.ai-prompts ol { padding-left: 1.25rem; }
.ai-prompts ol li {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
  list-style: decimal;
}
.ai-prompts ol li::marker { color: var(--primary); }

/* ── Watch-outs box ── */
.watchout-box {
  background: rgba(248,81,73,0.05);
  border: 1px solid rgba(248,81,73,0.15);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}
.watchout-box h4 {
  color: var(--danger);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
}
.watchout-box ul { padding-left: 1.25rem; }
.watchout-box ul li { font-size: 0.85rem; color: var(--muted); list-style: disc; margin-bottom: 0.3rem; }

/* ── Project idea callout ── */
.project-callout {
  background: rgba(107,33,168,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}
.project-callout h4 {
  color: var(--primary);
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
  font-family: 'JetBrains Mono', monospace;
}
.project-callout p { font-size: 0.875rem; color: var(--muted); }
.project-callout .btn { margin-top: 0.75rem; font-size: 0.78rem; }

/* ── Notebook embed area ── */
.notebook-area {
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1rem 0;
  text-align: center;
}
.notebook-area p { font-size: 0.875rem; color: var(--muted); margin-bottom: 0.75rem; }
.notebook-links { display: flex; gap: 0.5rem; justify-content: center; flex-wrap: wrap; }

/* ── Page-level hero variants ── */
.hero-sm {
  padding: 3rem 0 2.5rem;
  background: linear-gradient(160deg, #faf5ff 0%, #f3e8ff 35%, #ffffff 75%);
  border-bottom: 1px solid var(--border-dim);
}
.hero-sm .hero-title { font-size: clamp(1.4rem, 3vw, 2rem); }

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--border-dim);
  margin: 2rem 0;
}

/* ── Highlight box ── */
.highlight-box {
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1rem 0;
}

/* ── Stat items ── */
.stats-row {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-family: 'Baloo 2', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.stat-label { font-size: 0.8rem; color: var(--muted); margin-top: 0.25rem; }

/* ── Tags list ── */
.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.75rem 0; }
.tag {
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: 4px;
  padding: 0.15rem 0.55rem;
  font-size: 0.75rem;
  color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .onenote-wrap { grid-template-columns: 220px 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: rgba(255,255,255,0.98); padding: 1rem; gap: 0.25rem; border-bottom: 1px solid var(--border-dim); box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
  .nav-links.open { display: flex; }
  .nav-links li a { padding: 0.65rem 1rem; border-radius: var(--radius); display: block; }
  .nav-auth { display: none; }
  .nav-toggle { display: flex; }
  .nav { position: sticky; }

  .hero { padding: 3.5rem 0 2.5rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .trust-strip { gap: 1.25rem; }

  /* OneNote mobile */
  .onenote-wrap { grid-template-columns: 1fr; height: auto; overflow: visible; }
  .onenote-sidebar { display: none; }
  .onenote-mobile-select { display: block; }
  .onenote-content { padding: 1.5rem 1rem; }

  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .stats-row { gap: 1.5rem; }
  .milestone-card { flex-direction: column; }
  .completion-banner { flex-direction: column; text-align: center; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .arch-boxes { flex-direction: column; align-items: center; }
  .tab-btn { padding: 0.5rem 0.75rem; font-size: 0.8rem; }
  .section { padding: 3rem 0; }
  .onenote-content { padding: 1.25rem 1rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.35rem; }
  .container { padding: 0 1rem; }
  .card { padding: 1.25rem; }
  .contact-form { padding: 1.5rem; }
  .quiz-block { padding: 1.25rem; }
}

/* ── Notebook card (open in new tab) ── */
.notebook-card {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin: 0.5rem 0 1rem;
  flex-wrap: wrap;
}
.notebook-card-icon {
  font-size: 2rem;
  flex-shrink: 0;
}
.notebook-card-body {
  flex: 1;
  min-width: 200px;
}
.notebook-card-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.notebook-card-desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
  line-height: 1.5;
}
.notebook-card-note {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--primary);
  opacity: 0.75;
}
.notebook-open-btn {
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Sign-in modal ── */
.auth-modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center;
  padding: 1rem;
}
.auth-modal-overlay.open { display: flex; }
.auth-modal-card {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  width: 100%; max-width: 420px;
  position: relative;
  box-shadow: var(--shadow-lg);
}
.auth-modal-close {
  position: absolute; top: 1rem; right: 1rem;
  background: none; border: none; cursor: pointer;
  font-size: 1rem; color: var(--muted); line-height: 1;
  padding: 0.25rem;
}
.auth-modal-close:hover { color: var(--text); }
.auth-modal-brand { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1.25rem; }
.auth-modal-title { font-size: 1.25rem; margin-bottom: 0.35rem; }
.auth-modal-sub { color: var(--muted); font-size: 0.875rem; margin-bottom: 1.5rem; line-height: 1.6; }
.auth-google-btn { width: 100%; justify-content: center; gap: 0.6rem; padding: 0.8rem; font-size: 0.95rem; }
.auth-divider {
  display: flex; align-items: center; gap: 0.75rem;
  margin: 1.25rem 0; color: var(--muted); font-size: 0.8rem;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border-dim);
}
.auth-email-form { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.auth-email-input {
  flex: 1; min-width: 0;
  background: var(--surface); border: 1px solid var(--border-dim);
  border-radius: var(--radius); padding: 0.65rem 0.9rem;
  color: var(--text); font-size: 0.9rem;
  transition: border-color var(--transition);
}
.auth-email-input:focus { outline: none; border-color: var(--primary); }
.auth-email-btn { white-space: nowrap; }
.auth-modal-notice { font-size: 0.8rem; margin-top: 0.75rem; min-height: 1rem; }

/* ── Print ── */
@media print { .nav, .footer, .chat-widget { display: none; } }