/* ============================================
   CAMPUSBASE — "Neon Scholar" Design System
   Vibrant Palette: Electric Indigo + Neon Cyan
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  /* ── Vibrant Palette — Light Mode ── */
  /* Crisp White #FFFFFF | Cool Gray #94A3B8 | Slate #64748B */
  /* Electric Indigo #6366F1 | Neon Cyan #06B6D4 | Deep Space #09090B */
  --white: #ffffff;
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-section: #f8fafc;

  --purple: #6366F1;
  --purple-light: #818CF8;
  --purple-dark: #4F46E5;
  --purple-50: rgba(99,102,241,0.06);
  --purple-100: rgba(99,102,241,0.1);
  --purple-200: rgba(99,102,241,0.18);
  --purple-bg: rgba(99,102,241,0.06);
  --purple-bg-hover: rgba(99,102,241,0.12);
  --purple-border: rgba(99,102,241,0.18);

  --text-dark: #0f172a;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  --border: rgba(148,163,184,0.25);
  --border-hover: #6366F1;
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.06);
  --shadow: 0 4px 16px rgba(15,23,42,0.08);
  --shadow-lg: 0 12px 40px rgba(15,23,42,0.12);
  --shadow-purple: 0 4px 24px rgba(99,102,241,0.25);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --ease: 0.25s ease;
  --ease-smooth: 0.35s cubic-bezier(0.4,0,0.2,1);
  --nav-bg: rgba(248,250,252,0.88);
  --card-bg: #ffffff;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
  /* Deep Space base + Soft Slate surfaces + Electric Indigo + Neon Cyan accents */
  --white: #111827;
  --bg: #09090B;
  --bg-alt: #111827;
  --bg-section: #09090B;
  --text-dark: #f1f5f9;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(148,163,184,0.12);
  --border-hover: #818CF8;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.6);
  --shadow-purple: 0 4px 28px rgba(99,102,241,0.35);
  --purple: #818CF8;
  --purple-light: #A5B4FC;
  --purple-dark: #6366F1;
  --purple-50: rgba(129,140,248,0.08);
  --purple-100: rgba(129,140,248,0.14);
  --purple-200: rgba(129,140,248,0.22);
  --purple-bg: rgba(129,140,248,0.06);
  --purple-border: rgba(129,140,248,0.18);
  --nav-bg: rgba(9,9,11,0.92);
  --card-bg: #111827;
}

/* ── Reset ── */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; overflow-x:hidden; max-width:100%; }
body {
  font-family:'DM Sans',-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  animation:fadeInPage .5s ease;
}
@keyframes fadeInPage { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }
@keyframes floatY { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
a { text-decoration:none; color:inherit; }
img { max-width:100%; display:block; }
img.logo-icon { display:inline-block; width:32px; height:32px; border-radius:var(--radius-sm); }
button { cursor:pointer; font-family:inherit; border:none; }

::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-track { background:var(--bg); }
::-webkit-scrollbar-thumb { background:var(--purple-200); border-radius:10px; }

.container { max-width:1120px; margin:0 auto; padding:0 24px; }

/* ── Navbar ── */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  padding:12px 0; background:var(--nav-bg);
  backdrop-filter:blur(16px); -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  transition:var(--ease);
}
/* Dark navbar with vibrant glow border */
[data-theme="dark"] .navbar {
  border-bottom-color: rgba(99,102,241,0.15);
  box-shadow:0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(99,102,241,0.1);
}
.navbar .container { display:flex; align-items:center; justify-content:space-between; position:relative; }

.nav-logo {
  display:flex; align-items:center; gap:8px;
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.25rem; font-weight:800; color:var(--text-dark);
}
.logo-icon {
  width:32px; height:32px; border-radius:var(--radius-sm);
  background:linear-gradient(135deg,#6366F1,#06B6D4); color:#fff;
  display:flex; align-items:center; justify-content:center; font-size:0.9rem;
}

.nav-links { display:flex; align-items:center; gap:4px; list-style:none; }
.nav-links a {
  padding:8px 16px; border-radius:var(--radius-full);
  font-size:0.88rem; font-weight:500; color:var(--text-secondary);
  transition:var(--ease);
}
.nav-links a:hover { color:var(--purple); }
.nav-links a.active { color:var(--purple); font-weight:600; }

.nav-signup-btn {
  background:var(--purple) !important; color:#fff !important;
  font-weight:600 !important; font-size:0.85rem !important;
  padding:9px 22px !important;
  box-shadow:var(--shadow-purple); border-radius:var(--radius-full) !important;
  transition:var(--ease) !important;
}
.nav-signup-btn:hover { background:var(--purple-dark) !important; transform:translateY(-1px); }

.nav-hamburger { display:none; flex-direction:column; gap:5px; cursor:pointer; padding:4px; z-index:1001; }
.nav-hamburger span { width:22px; height:2px; background:var(--text-dark); border-radius:2px; transition:var(--ease); }
.nav-hamburger.active span:nth-child(1) { transform:rotate(45deg) translate(5px,5px); }
.nav-hamburger.active span:nth-child(2) { opacity:0; }
.nav-hamburger.active span:nth-child(3) { transform:rotate(-45deg) translate(5px,-5px); }

/* Nav actions (dark-toggle + donate side by side) */
.nav-actions { display:flex; align-items:center; gap:8px; }

/* ── Desktop 3-column navbar: logo | centered links | actions ── */
.nav-actions-desktop { display:none; }
@media(min-width:769px){
  .navbar .container { position:relative; }
  .nav-links {
    position:absolute; left:50%; transform:translateX(-50%);
    gap:4px; flex-wrap:nowrap;
  }
  .nav-links li:not(.nav-actions) { flex-shrink:0; }
  /* Hide mobile-drawer actions from desktop centered links */
  .nav-links li.nav-actions { display:none; }
  /* Show the standalone right-aligned desktop actions */
  .nav-actions-desktop {
    display:flex; align-items:center; gap:8px;
    margin-left:auto;
  }
}

/* ── Hero ── */
.hero {
  padding:140px 0 80px; background:var(--white);
  position:relative; overflow:hidden;
}
/* Dark mode hero background */
[data-theme="dark"] .hero {
  background: #09090B;
}
[data-theme="dark"] .hero::before {
  background:
    radial-gradient(ellipse 80% 60% at 20% 30%, rgba(99,102,241,0.12) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 80% 70%, rgba(6,182,212,0.08) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 10%, rgba(99,102,241,0.06) 0%, transparent 40%);
}

.hero-inner {
  display:grid; grid-template-columns:1fr 1fr; gap:48px;
  align-items:center;
}

.hero-text { max-width:500px; }

.hero-badge {
  display:inline-flex; align-items:center; gap:6px;
  padding:6px 14px; background:var(--purple-50);
  border:1px solid var(--purple-border); border-radius:var(--radius-full);
  font-size:0.75rem; font-weight:600; color:var(--purple);
  margin-bottom:20px;
}

.hero-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:clamp(2.2rem,5vw,3.4rem);
  font-weight:800; line-height:1.1; color:var(--text-dark);
  margin-bottom:18px; letter-spacing:-0.5px;
}
.hero-title span { color:var(--purple); }

.hero-desc {
  font-size:1rem; color:var(--text-secondary); line-height:1.7;
  margin-bottom:28px; max-width:420px;
}

.hero-buttons { display:flex; gap:12px; align-items:center; flex-wrap:wrap; }

.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 28px; border-radius:var(--radius-full);
  font-size:0.9rem; font-weight:600; transition:var(--ease);
}
.btn-primary {
  background:var(--purple); color:#fff;
  box-shadow:var(--shadow-purple);
}
.btn-primary:hover { background:var(--purple-dark); transform:translateY(-2px) scale(1.02); box-shadow:0 8px 32px rgba(99,102,241,0.35); }
.btn-outline {
  background:transparent; color:var(--text);
  border:1.5px solid var(--border);
}
.btn-outline:hover { border-color:var(--purple); color:var(--purple); }

.hero-image {
  display:flex; align-items:center; justify-content:center;
  position:relative;
}
.hero-image-placeholder {
  width:100%; max-width:420px; aspect-ratio:1;
  background:var(--purple-50); border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-size:8rem; position:relative;
}
.hero-image-placeholder::after {
  content:'▶'; position:absolute; bottom:20%; right:10%;
  width:52px; height:52px; border-radius:50%;
  background:var(--purple); color:#fff; font-size:1.2rem;
  display:flex; align-items:center; justify-content:center;
  box-shadow:var(--shadow-purple);
}

/* Stats Bar — Flat layout (no glassmorphism) */
.stats-bar {
  margin-top:60px; padding:32px 0;
  border-top:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between;
  flex-wrap:wrap; gap:20px;
}
.stat-item { display:flex; flex-direction:column; }
.stat-value {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.6rem; font-weight:800; color:var(--purple);
}
.stat-label { font-size:0.78rem; color:var(--text-muted); margin-top:2px; }
.stat-trust {
  font-size:0.85rem; color:var(--text-secondary);
  max-width:220px; line-height:1.5;
}
.stat-trust strong { color:var(--text-dark); }

/* ── Section ── */
.section { padding:80px 0; }
.section-white { background:var(--white); }
.section-gray { background:var(--bg); }
.section-purple-bg { background:var(--bg-section); }

.section-header { text-align:center; margin-bottom:48px; }
.section-badge {
  display:inline-flex; align-items:center; gap:6px;
  padding:5px 14px; background:var(--purple-50);
  border:1px solid var(--purple-border); border-radius:var(--radius-full);
  font-size:0.7rem; font-weight:700; color:var(--purple);
  text-transform:uppercase; letter-spacing:1.5px; margin-bottom:14px;
}
.section-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:clamp(1.6rem,3.5vw,2.4rem);
  font-weight:800; color:var(--text-dark); line-height:1.2;
  margin-bottom:10px;
}
.section-title span { color:var(--purple); }
.section-subtitle {
  font-size:0.92rem; color:var(--text-secondary);
  max-width:480px; margin:0 auto; line-height:1.7;
}

/* ── How It Works — 3-column card grid ── */
.hiw-section { background:var(--bg-alt); }
[data-theme="dark"] .hiw-section { background:#09090B; }
.hiw-cards-grid {
  display:grid; grid-template-columns:repeat(3,1fr); gap:24px;
}
.hiw-card {
  padding:32px 28px; text-align:left;
  border:1px solid var(--border); border-radius:var(--radius-lg);
  background:var(--white); transition:var(--ease-smooth);
}
.hiw-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg); }
.hiw-card-label {
  font-size:0.65rem; font-weight:700; letter-spacing:2px;
  color:var(--text-muted); text-transform:uppercase;
  margin-bottom:24px;
}
.hiw-card-icon {
  margin-bottom:24px; display:flex; align-items:center; justify-content:center;
  min-height:120px;
}
.hiw-card-icon svg { opacity:0.6; }
.hiw-card-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.05rem; font-weight:700; color:var(--text-dark);
  margin-bottom:8px;
}
.hiw-card-desc { font-size:0.85rem; color:var(--text-secondary); line-height:1.7; }
@media(max-width:768px){
  .hiw-cards-grid { grid-template-columns:1fr; gap:16px; }
}

/* ── Course Cards ── */
.courses-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.course-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-xl); padding:24px;
  transition:var(--ease-smooth); display:block; position:relative;
}
.course-card:hover {
  border-color:var(--purple-200);
  box-shadow:var(--shadow-lg);
  transform:translateY(-4px);
}

.course-icon-wrap {
  width:48px; height:48px; border-radius:var(--radius-md);
  display:flex; align-items:center; justify-content:center;
  font-size:1.4rem; margin-bottom:16px;
}
.cw-purple { background:var(--purple-50); color:var(--purple); }
.cw-blue { background:rgba(59,130,246,0.1); color:#3b82f6; }
.cw-pink { background:rgba(236,72,153,0.1); color:#ec4899; }
.cw-green { background:rgba(16,185,129,0.1); color:#10b981; }
.cw-orange { background:rgba(245,158,11,0.1); color:#f59e0b; }
.cw-indigo { background:rgba(99,102,241,0.1); color:#6366f1; }

.course-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1rem; font-weight:700; color:var(--text-dark);
  margin-bottom:6px;
}
.course-desc { font-size:0.82rem; color:var(--text-secondary); line-height:1.6; margin-bottom:14px; }
.course-meta { display:flex; gap:14px; font-size:0.72rem; color:var(--text-muted); }
.course-meta span { display:flex; align-items:center; gap:3px; }
.course-arrow {
  position:absolute; top:24px; right:24px;
  font-size:1rem; color:var(--text-muted); transition:var(--ease);
}
.course-card:hover .course-arrow { color:var(--purple); transform:translateX(4px); }

/* ── Course Detail Page ── */
.page-hero {
  padding:120px 0 48px; background:var(--white);
  border-bottom:1px solid var(--border); text-align:center;
}
.page-hero-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:clamp(1.8rem,4vw,2.6rem); font-weight:800;
  color:var(--text-dark); margin-bottom:10px;
}
.page-hero-title span { color:var(--purple); }
.page-hero-desc { font-size:0.95rem; color:var(--text-secondary); max-width:480px; margin:0 auto; }

.course-tabs {
  display:flex; justify-content:center; gap:4px; margin-bottom:36px;
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-full); padding:4px;
  max-width:620px; margin-left:auto; margin-right:auto;
}
.course-tab {
  flex:1; padding:10px 14px; border-radius:var(--radius-full);
  background:transparent; color:var(--text-secondary);
  font-size:0.78rem; font-weight:600; transition:var(--ease);
  text-align:center; white-space:nowrap;
}
.course-tab:hover { color:var(--text-dark); }
.course-tab.active {
  background:var(--purple); color:#fff;
  box-shadow:var(--shadow-purple);
}

.course-panel { display:none; }
.course-panel.active { display:block; animation:fadeIn 0.3s ease-out; }

/* ── Module Tabs (see Immersive Module Tabs section below) ── */

/* Syllabus Card */
.syllabus-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-xl); padding:32px; max-width:640px; margin:0 auto;
}
.syllabus-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.05rem; font-weight:700; color:var(--text-dark);
  margin-bottom:18px;
}
.syllabus-list { padding-left:20px; counter-reset:syl; list-style:none; }
.syllabus-list li {
  font-size:0.88rem; color:var(--text); line-height:1.7;
  padding:8px 0; border-bottom:1px solid var(--border);
  display:flex; align-items:flex-start; gap:12px;
  counter-increment:syl;
}
.syllabus-list li:last-child { border-bottom:none; }
.syllabus-list li::before {
  content:counter(syl); min-width:28px; height:28px; border-radius:50%;
  background:var(--purple-50); color:var(--purple);
  font-size:0.72rem; font-weight:700;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}

/* Module Content Card */
.module-content-card {
  max-width:680px; margin:0 auto;
}
.module-content-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.1rem; font-weight:700; color:var(--text-dark);
  margin-bottom:20px; text-align:center;
}
.module-resources { display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.module-resource-link {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:20px 22px;
  display:flex; gap:14px; align-items:center; transition:var(--ease-smooth);
  text-decoration:none; color:inherit; cursor:pointer;
}
.module-resource-link:hover { border-color:var(--purple-200); box-shadow:var(--shadow); transform:translateY(-2px); }
.resource-icon {
  width:44px; height:44px; border-radius:var(--radius-md);
  background:var(--purple-50);
  display:flex; align-items:center; justify-content:center;
  font-size:1.3rem; flex-shrink:0;
}
.resource-text { flex:1; }
.resource-label {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.9rem; font-weight:700; color:var(--text-dark); margin-bottom:2px;
}
.resource-desc { font-size:0.78rem; color:var(--text-secondary); line-height:1.5; }
.resource-arrow { font-size:1.1rem; color:var(--text-muted); transition:var(--ease); flex-shrink:0; }
.module-resource-link:hover .resource-arrow { color:var(--purple); transform:translateX(4px); }

/* Resource Section Card (topic page) */
.resource-section-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-xl); padding:28px; margin-bottom:20px;
  max-width:800px; margin-left:auto; margin-right:auto;
}
.resource-section-card h3 {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.05rem; font-weight:700; color:var(--text-dark); margin-bottom:16px;
}

/* ── Topic Detail Page ── */
.topic-back-link {
  display:inline-flex; align-items:center; gap:4px;
  font-size:0.82rem; font-weight:600; color:var(--purple);
  margin-bottom:16px; transition:var(--ease);
}
.topic-back-link:hover { opacity:0.7; }

.explanation-section { max-width:800px; margin:0 auto; }
.video-player { margin-bottom:28px; }
.video-embed { position:relative; padding-top:56.25%; background:#f1f5f9; border-radius:var(--radius-lg); overflow:hidden; }
.video-embed iframe { position:absolute; top:0; left:0; width:100%; height:100%; border:none; }
.video-meta { padding:14px 0; }
.video-meta h3 { font-family:'Plus Jakarta Sans',sans-serif; font-size:1rem; font-weight:700; color:var(--text-dark); margin-bottom:2px; }
.video-meta p { font-size:0.82rem; color:var(--text-muted); }
.explanation-text {
  background:var(--white); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:28px; font-size:0.88rem; color:var(--text); line-height:1.8;
}
.explanation-text h3 { font-family:'Plus Jakarta Sans',sans-serif; font-size:1.1rem; font-weight:700; color:var(--text-dark); margin-bottom:12px; }
.explanation-text h4 { font-family:'Plus Jakarta Sans',sans-serif; font-size:0.95rem; font-weight:700; color:var(--purple); margin:16px 0 8px; }
.explanation-text ul { padding-left:20px; margin-bottom:12px; }
.explanation-text li { margin-bottom:4px; }
.explanation-text strong { color:var(--purple); }

/* ── Immersive Content Utilities ── */
.explanation-text .def-box {
  background:var(--purple-50); border-left:4px solid var(--purple);
  padding:14px 18px; border-radius:0 var(--radius-md) var(--radius-md) 0;
  margin:14px 0; font-size:0.88rem; line-height:1.7;
}
.explanation-text .example-box {
  background:var(--bg-alt); border:1px solid var(--border);
  border-radius:var(--radius-md); padding:14px 18px; margin:12px 0;
}
.explanation-text .example-box::before {
  content:'💡 Example'; display:block; font-weight:700; font-size:0.8rem;
  color:var(--purple); margin-bottom:6px; text-transform:uppercase; letter-spacing:0.5px;
}
.explanation-text .key-box {
  background:linear-gradient(135deg,var(--purple-50),transparent);
  border:1px solid var(--purple-border); border-radius:var(--radius-md);
  padding:14px 18px; margin:12px 0;
}
.explanation-text .key-box::before {
  content:'🔑 Key Concept'; display:block; font-weight:700; font-size:0.8rem;
  color:var(--purple); margin-bottom:6px;
}
.explanation-text .tip-box {
  background:rgba(6,182,212,0.06); border-left:4px solid #06B6D4;
  padding:12px 16px; border-radius:0 var(--radius-md) var(--radius-md) 0;
  margin:12px 0; font-size:0.85rem;
}
.explanation-text .tip-box::before {
  content:'✅ Tip'; display:block; font-weight:700; font-size:0.78rem;
  color:#06B6D4; margin-bottom:4px;
}
.explanation-text .warn-box {
  background:rgba(245,158,11,0.06); border-left:4px solid #F59E0B;
  padding:12px 16px; border-radius:0 var(--radius-md) var(--radius-md) 0;
  margin:12px 0; font-size:0.85rem;
}
.explanation-text .warn-box::before {
  content:'⚠️ Important'; display:block; font-weight:700; font-size:0.78rem;
  color:#F59E0B; margin-bottom:4px;
}
.explanation-text table {
  width:100%; border-collapse:collapse; margin:14px 0; font-size:0.84rem;
}
.explanation-text th {
  background:var(--purple); color:#fff; padding:10px 14px;
  text-align:left; font-weight:600; font-size:0.82rem;
}
.explanation-text td {
  padding:9px 14px; border-bottom:1px solid var(--border);
}
.explanation-text tr:nth-child(even) td { background:var(--purple-50); }
.explanation-text pre {
  background:var(--bg-alt); border:1px solid var(--border);
  border-radius:var(--radius-md); padding:14px 18px; overflow-x:auto;
  font-size:0.82rem; line-height:1.6; margin:12px 0;
}
.explanation-text code { font-family:'Fira Code',monospace; font-size:0.84rem; }
.explanation-text .formula {
  background:var(--purple-50); border:1px dashed var(--purple-border);
  border-radius:var(--radius-md); padding:12px 18px; margin:12px 0;
  font-family:'Fira Code',monospace; font-size:0.9rem; text-align:center;
  color:var(--purple-dark); font-weight:600;
}

.detailed-notes-card {
  background:var(--white); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:32px; max-width:800px; margin:0 auto;
  font-size:0.88rem; color:var(--text); line-height:1.8;
}
.detailed-notes-card h3 { font-family:'Plus Jakarta Sans',sans-serif; font-size:1.1rem; font-weight:700; color:var(--text-dark); margin-bottom:12px; }
.detailed-notes-card h4 { font-size:0.95rem; font-weight:700; color:var(--purple); margin:16px 0 8px; }
.detailed-notes-card ul { padding-left:20px; margin-bottom:12px; }
.detailed-notes-card li { margin-bottom:4px; }
.detailed-notes-card strong { color:var(--purple); }

/* ── Note Cards ── */
.notes-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(340px,1fr)); gap:14px; }
.note-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); overflow:hidden; transition:var(--ease-smooth);
}
.note-card:hover { border-color:var(--purple-200); box-shadow:var(--shadow); }

.note-header {
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 20px; cursor:pointer; transition:var(--ease); gap:10px;
}
.note-header:hover { background:var(--purple-50); }
.note-header-left { display:flex; align-items:center; gap:12px; flex:1; min-width:0; }
.note-icon {
  width:38px; height:38px; border-radius:var(--radius-md);
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; flex-shrink:0;
}
.note-title { font-weight:600; font-size:0.88rem; color:var(--text-dark); }
.note-sub { font-size:0.72rem; color:var(--text-muted); margin-top:1px; }
.note-chevron { font-size:0.65rem; color:var(--text-muted); transition:var(--ease); flex-shrink:0; }
.note-card.open .note-chevron { transform:rotate(180deg); color:var(--purple); }

.note-body { max-height:0; overflow:hidden; transition:max-height 0.4s cubic-bezier(0.4,0,0.2,1); }
.note-card.open .note-body { max-height:600px; }
.note-body-inner {
  padding:0 20px 18px; border-top:1px solid var(--border);
  padding-top:14px; color:var(--text-secondary);
  font-size:0.85rem; line-height:1.75;
}
.note-body-inner strong { color:var(--purple); font-weight:600; }
.note-body-inner p { margin-bottom:6px; }
.note-body-inner p:last-child { margin-bottom:0; }

/* ── Revision Cards ── */
.revision-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:14px; }
.revision-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:22px;
  transition:var(--ease-smooth); position:relative; overflow:hidden;
}
.revision-card::before { content:''; position:absolute; top:0; left:0; bottom:0; width:3px; background:var(--purple); }
.revision-card:hover { border-color:var(--purple-200); box-shadow:var(--shadow); }
.revision-card h4 {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.92rem; font-weight:700; color:var(--text-dark);
  margin-bottom:10px; display:flex; align-items:center; gap:8px;
}
.revision-card ul { list-style:none; }
.revision-card li {
  font-size:0.82rem; color:var(--text-secondary); line-height:1.65;
  padding:3px 0; padding-left:16px; position:relative;
}
.revision-card li::before { content:'→'; position:absolute; left:0; color:var(--purple); font-size:0.75rem; }

/* ── Question Bank ── */
.qbank-grid { display:flex; flex-direction:column; gap:12px; max-width:720px; margin:0 auto; }
.qb-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); overflow:hidden; transition:var(--ease-smooth);
}
.qb-card:hover { border-color:var(--purple-200); }
.qb-header {
  display:flex; align-items:center; gap:12px;
  padding:16px 20px; cursor:pointer; transition:var(--ease);
}
.qb-header:hover { background:var(--purple-50); }
.qb-num {
  width:36px; height:36px; border-radius:50%;
  background:var(--purple); color:#fff;
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.7rem; font-weight:800;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.qb-question { flex:1; font-weight:600; font-size:0.88rem; color:var(--text-dark); }
.qb-chevron { font-size:0.65rem; color:var(--text-muted); transition:var(--ease); flex-shrink:0; }
.qb-card.open .qb-chevron { transform:rotate(180deg); color:var(--purple); }
.qb-body { max-height:0; overflow:hidden; transition:max-height 0.4s cubic-bezier(0.4,0,0.2,1); }
.qb-card.open .qb-body { max-height:400px; }
.qb-answer {
  padding:14px 20px; border-top:1px solid var(--border);
  font-size:0.85rem; color:var(--text-secondary); line-height:1.75;
}
.qb-answer strong { color:var(--purple); }

/* ── Practice Set ── */
.practice-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(320px,1fr)); gap:14px; }
.practice-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); padding:20px 22px;
  transition:var(--ease-smooth);
}
.practice-card:hover { border-color:var(--purple-200); box-shadow:var(--shadow); transform:translateY(-2px); }
.practice-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:8px; }
.practice-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.92rem; font-weight:700; color:var(--text-dark);
}
.practice-diff {
  padding:3px 10px; border-radius:var(--radius-full);
  font-size:0.65rem; font-weight:700; text-transform:uppercase; letter-spacing:0.5px;
}
.diff-easy { background:#ecfdf5; color:#059669; }
.diff-medium { background:#fff7ed; color:#d97706; }
.diff-hard { background:#fdf2f8; color:#e11d48; }
.practice-desc { font-size:0.82rem; color:var(--text-secondary); line-height:1.6; }

/* Practice Set — Answer Toggle */
.practice-answer {
  margin-top:10px; padding:12px 16px;
  background:var(--purple-50); border-left:3px solid var(--purple);
  border-radius:0 var(--radius-md) var(--radius-md) 0;
  font-size:0.84rem; color:var(--text); line-height:1.7;
  animation:fadeIn 0.3s ease-out;
}
.practice-reveal-btn {
  margin-top:10px; padding:7px 18px;
  background:rgba(99,102,241,0.08); border:1px solid var(--purple-border);
  border-radius:var(--radius-full); color:var(--purple);
  font-size:0.78rem; font-weight:600; cursor:pointer;
  transition:var(--ease); font-family:inherit;
}
.practice-reveal-btn:hover {
  background:var(--purple-100); border-color:var(--purple);
  transform:translateY(-1px);
}

/* ── Project Cards ── */
.projects-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(340px,1fr)); gap:18px; }
.project-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-xl); overflow:hidden;
  transition:var(--ease-smooth); display:flex; flex-direction:column;
}
.project-card:hover { transform:translateY(-3px); box-shadow:var(--shadow-lg); }
.project-thumb {
  width:100%; height:170px;
  display:flex; align-items:center; justify-content:center;
  font-size:3rem;
}
.project-info { padding:20px 22px; flex:1; display:flex; flex-direction:column; }
.project-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.02rem; font-weight:700; color:var(--text-dark); margin-bottom:6px;
}
.project-desc { font-size:0.82rem; color:var(--text-secondary); line-height:1.6; margin-bottom:14px; flex:1; }
.project-tags { display:flex; flex-wrap:wrap; gap:6px; margin-bottom:16px; }
.project-tag {
  padding:3px 11px; border-radius:var(--radius-full);
  font-size:0.68rem; font-weight:600;
  background:var(--purple-50); color:var(--purple);
  border:1px solid var(--purple-border);
}
.project-links { display:flex; gap:8px; }
.project-link {
  display:inline-flex; align-items:center; gap:5px;
  padding:8px 16px; border-radius:var(--radius-full);
  font-size:0.76rem; font-weight:600; transition:var(--ease);
}
.project-link-gh { background:var(--bg); color:var(--text); border:1px solid var(--border); }
.project-link-gh:hover { border-color:var(--purple-200); color:var(--purple); }
.project-link-demo { background:var(--purple); color:#fff; }
.project-link-demo:hover { background:var(--purple-dark); transform:translateY(-1px); }

/* ── Donate ── */
.donate-wrapper { max-width:520px; margin:0 auto; }
.donate-card {
  background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-xl); padding:44px 36px;
  text-align:center; box-shadow:var(--shadow);
}
.donate-emoji { font-size:2.6rem; margin-bottom:14px; }
.donate-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.3rem; font-weight:700; color:var(--text-dark); margin-bottom:8px;
}
.donate-desc { color:var(--text-secondary); font-size:0.88rem; margin-bottom:28px; line-height:1.7; }
.donate-amounts { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-bottom:20px; }
.donate-amount {
  padding:11px 24px; border-radius:var(--radius-full);
  background:var(--bg); border:1px solid var(--border);
  color:var(--text); font-size:0.9rem; font-weight:600; transition:var(--ease);
}
.donate-amount:hover,.donate-amount.selected {
  background:var(--purple-50); border-color:var(--purple-200); color:var(--purple);
}
.donate-custom { max-width:160px; margin:0 auto 20px; }
.donate-custom-input {
  width:100%; padding:11px 14px; border-radius:var(--radius-full);
  background:var(--bg); border:1px solid var(--border);
  color:var(--text); font-size:0.9rem; font-weight:500;
  text-align:center; font-family:inherit; outline:none; transition:var(--ease);
}
.donate-custom-input::placeholder { color:var(--text-muted); }
.donate-custom-input:focus { border-color:var(--purple); box-shadow:0 0 0 3px rgba(124,58,237,0.08); }
.btn-donate {
  padding:14px 44px; background:var(--purple); color:#fff;
  border-radius:var(--radius-full); font-size:0.95rem; font-weight:700;
  transition:var(--ease); box-shadow:var(--shadow-purple);
}
.btn-donate:hover { background:var(--purple-dark); transform:translateY(-2px); }
.donate-note { margin-top:14px; font-size:0.72rem; color:var(--text-muted); }
.donate-note span { color:var(--purple); font-weight:600; }

/* ── CTA Banner ── */
.cta-banner {
  padding:72px 0; background:linear-gradient(135deg, #373839 0%, #1F1F20 100%);
  text-align:center; position:relative; overflow:hidden;
}
.cta-banner::before {
  content:''; position:absolute; inset:0;
  background:
    radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08), transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(255,255,255,0.05), transparent 50%);
  opacity:0.2;
  background-image: radial-gradient(circle at 2px 2px, white 1px, transparent 0);
  background-size: 40px 40px;
}
.cta-inner { position:relative; z-index:1; max-width:520px; margin:0 auto; }
.cta-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:clamp(1.5rem,3vw,2.1rem); font-weight:800; color:#fff;
  margin-bottom:12px;
}
.cta-desc { color:rgba(255,255,255,0.8); font-size:0.95rem; margin-bottom:24px; line-height:1.7; }
.btn-cta { background:#fff; color:var(--purple); font-weight:700; }
.btn-cta:hover { background:var(--purple-50); transform:translateY(-2px); box-shadow:var(--shadow-lg); }

/* ── Start Your Coding Journey CTA Banner ── */
.coding-journey-cta {
  padding:80px 0; background:#1F1F20;
  text-align:center; position:relative; overflow:hidden;
}
.journey-inner { max-width:600px; margin:0 auto; }
.journey-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:clamp(1.6rem,4vw,2.4rem); font-weight:800; color:#fff;
  margin-bottom:16px; line-height:1.3;
}
.journey-desc {
  color:rgba(255,255,255,0.85); font-size:1rem;
  margin-bottom:28px; line-height:1.7;
}
.btn-journey {
  display:inline-flex; align-items:center; gap:6px;
  background:#fff; color:var(--purple); font-weight:700;
  padding:14px 36px; border-radius:var(--radius-full);
  font-size:0.95rem; transition:var(--ease);
  box-shadow:0 4px 16px rgba(0,0,0,0.1);
}
.btn-journey:hover {
  transform:translateY(-2px); box-shadow:0 8px 24px rgba(0,0,0,0.15);
}
@media(max-width:768px){
  .coding-journey-cta { padding:56px 0; }
}

/* ── Footer ── */
.footer { padding:48px 0 24px; background:var(--white); border-top:1px solid var(--border); }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr 1fr; gap:32px; margin-bottom:32px; }
.footer-brand-desc { font-size:0.82rem; color:var(--text-secondary); line-height:1.7; margin-top:10px; max-width:240px; }
.footer-col-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.82rem; font-weight:700; color:var(--text-dark); margin-bottom:12px;
}
.footer-col ul { list-style:none; display:flex; flex-direction:column; gap:8px; }
.footer-col a { font-size:0.8rem; color:var(--text-muted); transition:var(--ease); }
.footer-col a:hover { color:var(--purple); }

.footer-bottom {
  padding-top:20px; border-top:1px solid var(--border);
  display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:10px;
}
.footer-copy { font-size:0.75rem; color:var(--text-muted); }
.footer-copy .heart { color:var(--purple); }
.footer-socials { display:flex; gap:6px; }
.footer-social-link {
  width:34px; height:34px; border-radius:50%;
  background:var(--bg); border:1px solid var(--border);
  display:flex; align-items:center; justify-content:center;
  font-size:0.85rem; transition:var(--ease);
}
.footer-social-link:hover { background:var(--purple-50); border-color:var(--purple-200); }

/* ── Animations ── */
@keyframes fadeIn { from{opacity:0} to{opacity:1} }
@keyframes fadeInUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }
.reveal { opacity:0; transform:translateY(24px); transition:opacity 0.6s ease-out,transform 0.6s ease-out; }
.reveal.visible { opacity:1; transform:translateY(0); }
.reveal-stagger > * { opacity:0; transform:translateY(16px); transition:opacity 0.5s ease-out,transform 0.5s ease-out; }
.reveal-stagger.visible > *:nth-child(1){transition-delay:0s;opacity:1;transform:none}
.reveal-stagger.visible > *:nth-child(2){transition-delay:.07s;opacity:1;transform:none}
.reveal-stagger.visible > *:nth-child(3){transition-delay:.14s;opacity:1;transform:none}
.reveal-stagger.visible > *:nth-child(4){transition-delay:.21s;opacity:1;transform:none}
.reveal-stagger.visible > *:nth-child(5){transition-delay:.28s;opacity:1;transform:none}
.reveal-stagger.visible > *:nth-child(6){transition-delay:.35s;opacity:1;transform:none}


/* ── Cheat Sheet Page ── */
.cs-search-wrap { max-width:520px; margin:20px auto 0; }
.cs-search {
  width:100%; padding:14px 20px; border:2px solid var(--border);
  border-radius:var(--radius-xl); background:var(--white);
  font-family:'DM Sans',sans-serif; font-size:0.92rem; color:var(--text-dark);
  transition:var(--ease); outline:none;
}
.cs-search:focus { border-color:var(--purple); box-shadow:0 0 0 4px rgba(124,58,237,0.1); }
.cs-category { margin-bottom:36px; }
.cs-cat-title {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:1.15rem; font-weight:800; color:var(--text-dark);
  margin-bottom:16px; padding-bottom:10px;
  border-bottom:2px solid var(--purple-50);
}
.cs-grid {
  display:grid; grid-template-columns:repeat(auto-fill,minmax(150px,1fr)); gap:12px;
}
.cs-card {
  display:flex; flex-direction:column; align-items:center; gap:6px;
  padding:18px 12px; background:var(--white); border:1px solid var(--border);
  border-radius:var(--radius-lg); text-decoration:none; color:var(--text-dark);
  transition:var(--ease-smooth); cursor:pointer; text-align:center;
}
.cs-card:hover {
  border-color:var(--purple-200); box-shadow:var(--shadow);
  transform:translateY(-3px); background:var(--purple-50);
}
.cs-emoji { display:flex; align-items:center; justify-content:center; width:28px; height:28px; color:var(--purple); flex-shrink:0; }
.cs-name {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.78rem; font-weight:700; color:var(--text-dark);
  line-height:1.3;
}
.cs-card:hover .cs-name { color:var(--purple); }

/* ── Responsive ── */
/* ── Course Search Box ── */
.course-search-wrap { max-width:520px; margin:20px auto 0; }
.course-search {
  width:100%; padding:14px 20px; border:2px solid var(--border);
  border-radius:var(--radius-xl); background:var(--white);
  font-family:'DM Sans',sans-serif; font-size:0.92rem; color:var(--text-dark);
  transition:var(--ease); outline:none;
}
.course-search:focus { border-color:var(--purple); box-shadow:0 0 0 4px rgba(124,58,237,0.1); }
.course-card.hidden-by-search { display:none !important; }

/* ── Mobile Overlay Navbar ── */
@media(max-width:768px){
  /* Overlay backdrop */
  .nav-links{
    position:fixed;top:0;right:-100%;width:75%;max-width:320px;
    height:100vh;height:100dvh;
    flex-direction:column;justify-content:flex-start;
    background:var(--white);
    padding:0;gap:0;
    transition:transform .35s cubic-bezier(0.4,0,0.2,1),right .35s cubic-bezier(0.4,0,0.2,1);
    border-left:1px solid var(--border);
    box-shadow:-8px 0 40px rgba(0,0,0,0.12);
    overflow-y:auto;
    z-index:1000;
  }
  .nav-links.open{ right:0; }

  /* Brand title inside drawer */
  .nav-links::before {
    content:'CampusBase';
    display:block;
    font-family:'Plus Jakarta Sans',sans-serif;
    font-size:1.3rem;font-weight:800;
    color:var(--text-dark);
    text-align:center;
    padding:28px 20px 20px;
    border-bottom:1px solid var(--border);
  }

  /* Nav links stacked full width */
  .nav-links li { width:100%; }
  .nav-links a {
    display:block;width:100%;
    padding:16px 24px;
    border-radius:0;
    font-size:1rem;font-weight:500;
    color:var(--text);
    border-bottom:1px solid var(--border);
    transition:var(--ease);
  }
  .nav-links a:hover,
  .nav-links a.active {
    color:var(--purple);
    background:var(--purple-50);
  }
  /* Remove animated underlines inside mobile drawer */
  .nav-links a:not(.nav-signup-btn)::after { display:none; }

  /* CTA + dark toggle action row at bottom of drawer */
  .nav-links li.nav-actions {
    padding:20px 24px; border-bottom:none;
    display:flex; align-items:center; justify-content:center; gap:12px;
  }
  .nav-actions .dark-toggle {
    display:flex !important; align-items:center; justify-content:center;
    width:40px; height:40px; flex-shrink:0;
    border:1px solid var(--border); border-radius:50%;
    background:var(--purple-50); font-size:1rem; cursor:pointer;
  }
  .nav-signup-btn {
    display:flex !important;align-items:center;justify-content:center;
    flex:1;
    border-radius:var(--radius-lg) !important;
    text-align:center;
  }

  .nav-hamburger{display:flex;z-index:1001}

  /* Layout adjustments */
  .hero-inner{grid-template-columns:1fr;text-align:center}
  .hero-text{max-width:100%;margin:0 auto}
  .hero-desc{margin:0 auto 28px}
  .hero-buttons{justify-content:center}
  .hero-image{order:-1}
  .stats-bar{justify-content:center;text-align:center}
  .hiw-grid{grid-template-columns:1fr}
  .courses-grid{grid-template-columns:1fr}
  .notes-grid,.videos-grid,.projects-grid,.revision-grid{grid-template-columns:1fr}
  .section{padding:56px 0}
  .donate-card{padding:28px 18px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:20px}
  .footer-bottom{justify-content:center;text-align:center}
  .course-search-wrap{margin:16px auto 0;max-width:100%}
}
@media(max-width:480px){
  .hero-title{font-size:2rem}
  .hero-buttons{flex-direction:column;align-items:center}
  .donate-amounts{flex-direction:column;align-items:center}
  .footer-grid{grid-template-columns:1fr}
  .module-resources{grid-template-columns:1fr}
}

/* ╔══════════════════════════════════════════╗
   ║  VISUAL ENHANCEMENTS — WOW FACTOR       ║
   ╚══════════════════════════════════════════╝ */

/* ── Animated Gradient Hero ── */
.hero { position:relative; overflow:hidden; }
.hero::before {
  content:'';position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 30%, rgba(99,102,241,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 70%, rgba(6,182,212,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 90% 40% at 50% 10%, rgba(99,102,241,0.05) 0%, transparent 60%);
  animation:heroGradient 8s ease-in-out infinite alternate;
}
@keyframes heroGradient {
  0%{opacity:.7;transform:scale(1) rotate(0)}
  100%{opacity:1;transform:scale(1.05) rotate(1deg)}
}
.hero > * { position:relative; z-index:1; }

/* ── Floating Particles (CSS-only) ── */
.hero-particles {
  position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none;
}
.hero-particles span {
  position:absolute;border-radius:50%;
  background:rgba(99,102,241,0.15);
  animation:floatUp linear infinite;
}
.hero-particles span:nth-child(1){width:6px;height:6px;left:10%;animation-duration:12s;animation-delay:0s}
.hero-particles span:nth-child(2){width:8px;height:8px;left:25%;animation-duration:10s;animation-delay:2s}
.hero-particles span:nth-child(3){width:5px;height:5px;left:40%;animation-duration:14s;animation-delay:1s}
.hero-particles span:nth-child(4){width:10px;height:10px;left:55%;animation-duration:11s;animation-delay:3s}
.hero-particles span:nth-child(5){width:7px;height:7px;left:70%;animation-duration:13s;animation-delay:0.5s}
.hero-particles span:nth-child(6){width:4px;height:4px;left:85%;animation-duration:9s;animation-delay:2.5s}
.hero-particles span:nth-child(7){width:9px;height:9px;left:15%;animation-duration:15s;animation-delay:4s}
.hero-particles span:nth-child(8){width:6px;height:6px;left:60%;animation-duration:10s;animation-delay:1.5s}
@keyframes floatUp {
  0%{transform:translateY(100vh) scale(0);opacity:0}
  10%{opacity:1}
  90%{opacity:1}
  100%{transform:translateY(-10vh) scale(1);opacity:0}
}

/* ── Glassmorphism Cards ── */
.course-card:hover,.cs-card:hover,.module-resource-link:hover {
  background:rgba(255,255,255,0.6);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-color:rgba(99,102,241,0.25);
}
[data-theme="dark"] .course-card:hover,
[data-theme="dark"] .cs-card:hover,
[data-theme="dark"] .module-resource-link:hover {
  background:rgba(17,24,39,0.95);
  border-color:rgba(99,102,241,0.3);
  box-shadow:0 8px 32px rgba(0,0,0,0.5), 0 0 0 1px rgba(99,102,241,0.1);
}
/* Glass highlight on card top edges in dark mode */
[data-theme="dark"] .course-card,
[data-theme="dark"] .project-card,
[data-theme="dark"] .testimonial-card,
[data-theme="dark"] .note-card,
[data-theme="dark"] .revision-card,
[data-theme="dark"] .practice-card {
  border-top:1px solid rgba(99,102,241,0.08);
}

/* ── Card Shine Effect ── */
.course-card,.module-resource-link { position:relative; overflow:hidden; }
.course-card::after,.module-resource-link::after {
  content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;
  background:linear-gradient(120deg,transparent 30%,rgba(255,255,255,0.15) 50%,transparent 70%);
  transform:translateX(-100%);transition:none;pointer-events:none;
}
.course-card:hover::after,.module-resource-link:hover::after {
  transform:translateX(100%);transition:transform 0.6s ease;
}

/* ── Gradient Text for Headings ── */
.section-title span, .page-hero-title span, .hero-title span {
  background:linear-gradient(135deg,#6366F1,#06B6D4);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}

/* ── Animated Nav Link Underlines ── */
.nav-links a:not(.nav-signup-btn)::after {
  content:'';position:absolute;bottom:-2px;left:50%;width:0;height:2px;
  background:linear-gradient(90deg,#6366F1,#06B6D4);
  transition:all .3s ease;border-radius:2px;transform:translateX(-50%);
}
.nav-links a:not(.nav-signup-btn) { position:relative; }
.nav-links a:not(.nav-signup-btn):hover::after,
.nav-links a:not(.nav-signup-btn).active::after { width:70%; }

/* ── Pulsing CTA Buttons ── */
.btn-primary,.btn-cta { animation:btnPulse 2.5s ease-in-out infinite; }
@keyframes btnPulse {
  0%,100%{box-shadow:0 4px 20px rgba(99,102,241,0.25)}
  50%{box-shadow:0 4px 36px rgba(99,102,241,0.45)}
}

/* ── Better Hover States ── */
.course-card:hover { transform:translateY(-6px) scale(1.02); }
.btn:hover { transform:translateY(-2px) scale(1.02); filter:brightness(1.08); }
.hiw-step:hover { transform:translateX(6px); }
.footer-social-link:hover { transform:scale(1.2) rotate(5deg); }

/* ── Floating Blobs in Sections ── */
.section-white,.section-gray { position:relative; overflow:hidden; }
.section-white::before,.section-gray::before {
  content:'';position:absolute;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(99,102,241,0.05) 0%,transparent 70%);
  top:-80px;right:-100px;z-index:0;animation:blobFloat 12s ease-in-out infinite alternate;
}
.section-white::after,.section-gray::after {
  content:'';position:absolute;width:250px;height:250px;border-radius:50%;
  background:radial-gradient(circle,rgba(6,182,212,0.04) 0%,transparent 70%);
  bottom:-60px;left:-80px;z-index:0;animation:blobFloat 15s ease-in-out infinite alternate-reverse;
}
@keyframes blobFloat {
  0%{transform:translate(0,0) scale(1)}
  100%{transform:translate(30px,-20px) scale(1.1)}
}
.section > .container { position:relative; z-index:1; }

/* ── Custom Scrollbar ── */
::-webkit-scrollbar { width:8px; }
::-webkit-scrollbar-track { background:var(--bg); }
::-webkit-scrollbar-thumb {
  background:linear-gradient(180deg,#06B6D4,#6366F1);
  border-radius:8px;
}
::-webkit-scrollbar-thumb:hover { background:linear-gradient(180deg,var(--purple-dark),var(--purple)); }

/* ── Scroll Progress Bar ── */
.scroll-progress {
  position:fixed;top:0;left:0;height:3px;z-index:10001;
  background:linear-gradient(90deg,#6366F1,#818CF8,#06B6D4);
  width:0%;transition:width .1s linear;border-radius:0 2px 2px 0;
}

/* ── Back to Top ── */
.back-to-top {
  position:fixed;bottom:28px;right:28px;width:44px;height:44px;
  border-radius:50%;background:var(--purple);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;cursor:pointer;z-index:9998;
  box-shadow:0 4px 16px rgba(0,0,0,0.2);
  opacity:0;transform:translateY(20px);
  transition:var(--ease-smooth);pointer-events:none;
}
.back-to-top.visible { opacity:1;transform:none;pointer-events:auto; }
.back-to-top:hover { transform:translateY(-3px) scale(1.1);box-shadow:0 6px 24px rgba(0,0,0,0.3); }

/* ══════════════════════════════════════════
   UI Component: Dark Mode Toggle (shadcn-style Icon Button)
   ══════════════════════════════════════════ */
.dark-toggle {
  width:36px;height:36px;border-radius:var(--radius-md);
  background:transparent;
  border:1px solid var(--border);
  display:inline-flex;align-items:center;justify-content:center;
  cursor:pointer;transition:background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  flex-shrink:0;padding:0;
  position:relative;overflow:hidden;
}
.dark-toggle svg {
  width:16px;height:16px;fill:var(--text-secondary);
  transition:fill 0.2s ease, transform 0.45s cubic-bezier(0.34,1.56,0.64,1);
}
.dark-toggle:hover {
  background:var(--purple-50);
  border-color:var(--purple-border);
}
.dark-toggle:hover svg {
  fill:var(--purple);
  transform:rotate(30deg) scale(1.1);
}
.dark-toggle:active svg { transform:rotate(60deg) scale(0.95); }
/* Dark mode: brighter toggle */
[data-theme="dark"] .dark-toggle {
  border-color:rgba(148,163,184,0.18);
}
[data-theme="dark"] .dark-toggle svg {
  fill:#FBBF24;
  filter:drop-shadow(0 0 6px rgba(251,191,36,0.5));
}
[data-theme="dark"] .dark-toggle:hover {
  background:rgba(251,191,36,0.1);
  border-color:rgba(251,191,36,0.35);
}
[data-theme="dark"] .dark-toggle:hover svg {
  fill:#FDE047;
  filter:drop-shadow(0 0 10px rgba(253,224,71,0.6));
}

/* ══════════════════════════════════════════
   Animations: How It Works Character SVGs
   ══════════════════════════════════════════ */
/* Gentle floating motion for the SVG shapes */
@keyframes hiwFloat {
  0%,100% { transform:translateY(0); }
  50% { transform:translateY(-8px); }
}
/* Eye blink animation */
@keyframes hiwBlink {
  0%,92%,100% { transform:scaleY(1); }
  95% { transform:scaleY(0.1); }
}
/* Bounce on card hover */
@keyframes hiwBounce {
  0%,100% { transform:translateY(0) scale(1); }
  30% { transform:translateY(-12px) scale(1.05); }
  60% { transform:translateY(-4px) scale(1.02); }
}

/* Apply float to SVG character containers */
.hiw-card-icon .hiw-character {
  animation:hiwFloat 3s ease-in-out infinite;
}
/* Apply blink to eyes */
.hiw-card-icon .hiw-eye {
  animation:hiwBlink 4s ease-in-out infinite;
  transform-origin:center;
}
/* Stagger blink timing for each card */
.hiw-card:nth-child(2) .hiw-eye { animation-delay:1.2s; }
.hiw-card:nth-child(3) .hiw-eye { animation-delay:2.4s; }
/* Stagger float timing */
.hiw-card:nth-child(2) .hiw-character { animation-delay:0.5s; }
.hiw-card:nth-child(3) .hiw-character { animation-delay:1s; }

/* On hover: bounce the character */
.hiw-card:hover .hiw-character {
  animation:hiwBounce 0.6s ease forwards;
}

/* Card icon area styling */
.hiw-card-icon svg { opacity:1; }





/* ── Hero Code Display ── */
.hero-code-display {
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:24px;
  font-family:'Fira Code','Consolas',monospace;font-size:0.82rem;
  color:var(--text);line-height:1.8;position:relative;
  overflow-x:auto;overflow-y:hidden;box-shadow:var(--shadow);
  max-width:340px;margin:0 auto;box-sizing:border-box;
}
.hero-code-display::before {
  content:'●  ●  ●';position:absolute;top:10px;left:14px;
  font-size:0.55rem;color:var(--text-muted);letter-spacing:3px;
}
.hero-code-display code { display:block;margin-top:18px;white-space:pre-wrap;word-wrap:break-word;overflow-wrap:break-word; }
.hero-code-display .kw { color:var(--purple); }
.hero-code-display .str { color:#059669; }
.hero-code-display .fn { color:#6366f1; }
.hero-code-display .cm { color:var(--text-muted); }
[data-theme="dark"] .hero-code-display .str { color:#34d399; }

/* ── Typing Cursor ── */
.hero-typed { border-right:2px solid var(--purple);padding-right:2px; }

/* ── Testimonials Section — Cosmic Scholar glass cards ── */
.testimonials-grid {
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.testimonial-card {
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:24px;
  transition:var(--ease-smooth);
}
[data-theme="dark"] .testimonial-card {
  background:rgba(31,31,32,0.8);
  backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border:1px solid #373839; border-top:1px solid rgba(219,219,219,0.08);
}
.testimonial-card:hover { transform:translateY(-4px);box-shadow:var(--shadow-lg); }
[data-theme="dark"] .testimonial-card:nth-child(2) {
  transform:scale(1.05); border:1px solid rgba(124,58,237,0.2);
}
.testimonial-stars { color:#f59e0b;font-size:0.85rem;margin-bottom:10px; }
.testimonial-text {
  font-size:0.88rem;color:var(--text-secondary);
  margin-bottom:16px;line-height:1.7;font-style:italic;
}
.testimonial-author { display:flex;align-items:center;gap:10px; }
.testimonial-avatar {
  width:38px;height:38px;border-radius:50%;
  background:linear-gradient(135deg,var(--purple),#6366f1);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:0.8rem;flex-shrink:0;
}
[data-theme="dark"] .testimonial-avatar {
  background:rgba(124,58,237,0.2); border:1px solid rgba(124,58,237,0.3);
  color:var(--purple-light);
}
.testimonial-name {
  font-family:'Plus Jakarta Sans',sans-serif;
  font-size:0.82rem;font-weight:700;color:var(--text-dark);
}
.testimonial-role { font-size:0.72rem;color:var(--text-muted); }

/* ── FAQ Accordion — Cosmic Scholar tonal layering ── */
.faq-grid { max-width:700px;margin:0 auto;display:flex;flex-direction:column;gap:12px; }
.faq-item {
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-lg);overflow:hidden;transition:var(--ease);
}
[data-theme="dark"] .faq-item {
  background:#1F1F20; border-color: #373839;
}
.faq-item:hover { border-color:var(--purple-200); }
[data-theme="dark"] .faq-item:hover { background:#2a2a2b; }
.faq-q {
  padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;
  align-items:center;font-family:'Plus Jakarta Sans',sans-serif;
  font-weight:700;font-size:0.9rem;color:var(--text-dark);
  transition:var(--ease);
}
.faq-q:hover { color:var(--purple); }
.faq-chevron {
  font-size:0.8rem;transition:transform .3s ease;color:var(--text-muted);
}
.faq-item.open .faq-chevron { transform:rotate(180deg);color:var(--purple); }
.faq-a {
  max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease;
  padding:0 20px;font-size:0.85rem;color:var(--text-secondary);line-height:1.7;
}
.faq-item.open .faq-a { max-height:200px;padding:0 20px 18px; }

/* ── Confetti ── */
.confetti-piece {
  position:fixed;width:8px;height:8px;z-index:99999;pointer-events:none;
  animation:confettiFall 3s ease-out forwards;
}
@keyframes confettiFall {
  0%{opacity:1;transform:translateY(0) rotate(0)}
  100%{opacity:0;transform:translateY(100vh) rotate(720deg)}
}

/* ── Responsive Additions ── */
@media(max-width:768px){
  .testimonials-grid{grid-template-columns:1fr}
  .hero-code-display{max-width:280px;font-size:0.75rem}
  .back-to-top{bottom:16px;right:16px;width:38px;height:38px;font-size:0.9rem}
  .cta-banner{margin:0}
  [data-theme="dark"] .testimonial-card:nth-child(2){transform:none}
}

/* Dark mode: Project Detail code display */
[data-theme="dark"] .hero-code-display {
  background:#0A0A0A; border-color:#373839;
  box-shadow:0 4px 24px rgba(0,0,0,0.3);
}
[data-theme="dark"] .hero-code-display::before { color:#5F6062; }

/* Dark mode: Section alternating depth */
[data-theme="dark"] .section-white { background:#0A0A0A; }
[data-theme="dark"] .section-gray { background:#1F1F20; }
[data-theme="dark"] .section-purple-bg { background:#1F1F20; }

/* (Module tabs consolidated into Immersive Module Tabs section below) */
/* ══════════════════════════════════════════
   UI Component: Immersive Syllabus (Hierarchical)
   ══════════════════════════════════════════ */
.syllabus-wrapper {
  margin:24px 0 32px;
}
.syllabus-heading {
  font-size:1.3rem;font-weight:800;
  color:var(--text);
  margin-bottom:20px;
}
.syllabus-chapters {
  display:flex;flex-direction:column;gap:16px;
}
.syllabus-chapter {
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:16px;
  padding:24px 28px;
  position:relative;
  overflow:hidden;
  transition:transform 0.25s ease, box-shadow 0.25s ease;
}
.syllabus-chapter:hover {
  transform:translateY(-3px);
  box-shadow:0 12px 32px -8px rgba(0,0,0,0.12);
}

.syllabus-chapter-header {
  display:flex;align-items:center;gap:16px;
  margin-bottom:14px;
}
.syllabus-chapter-num {
  font-size:2.8rem;font-weight:900;
  color:var(--purple);
  opacity:0.18;
  line-height:1;
  letter-spacing:-0.04em;
  min-width:56px;
  text-align:center;
}
.syllabus-chapter-title {
  font-size:1.1rem;font-weight:700;
  color:var(--text);
  margin:0;
}

.syllabus-subtopics {
  display:flex;flex-wrap:wrap;gap:8px;
  padding-left:72px;
}
.syllabus-subtopic {
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(124,58,237,0.08);
  border:1px solid rgba(124,58,237,0.15);
  border-radius:20px;
  padding:6px 14px;
  font-size:0.82rem;font-weight:500;
  color:var(--text);
  transition:all 0.2s ease;
}
.syllabus-subtopic:hover {
  background:rgba(124,58,237,0.15);
  transform:translateY(-1px);
}
.subtopic-id {
  font-weight:700;
  color:var(--purple);
  font-size:0.78rem;
}

/* Dark mode syllabus */
[data-theme="dark"] .syllabus-chapter {
  background:rgba(30,30,35,0.7);
  border-color:rgba(255,255,255,0.06);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
[data-theme="dark"] .syllabus-chapter:hover {
  box-shadow:0 12px 32px -8px rgba(0,0,0,0.35);
  border-color:rgba(124,58,237,0.2);
}
[data-theme="dark"] .syllabus-chapter-num {
  color:#a78bfa;opacity:0.2;
}
[data-theme="dark"] .syllabus-subtopic {
  background:rgba(167,139,250,0.1);
  border-color:rgba(167,139,250,0.15);
}
[data-theme="dark"] .syllabus-subtopic:hover {
  background:rgba(167,139,250,0.2);
}
[data-theme="dark"] .subtopic-id {
  color:#a78bfa;
}

@media(max-width:768px){
  .syllabus-subtopics{padding-left:0;}
  .syllabus-chapter-num{font-size:2rem;min-width:40px;}
  .syllabus-chapter{padding:18px 20px;}
}

/* ══════════════════════════════════════════
   UI Component: Flashcard Deck (Card-Game Style)
   ══════════════════════════════════════════ */
.flashcard-deck {
  display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:28px;
}
.flashcard-container {
  position:relative;contain:content;
}
.flashcard {
  perspective:1200px;width:100%;height:280px;cursor:pointer;
}
.flashcard-inner {
  position:relative;width:100%;height:100%;
  transition:transform 0.65s cubic-bezier(0.34,1.56,0.64,1);
  transform-style:preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform:rotateY(180deg); }

/* Hover 3D lift effect */
.flashcard:hover .flashcard-inner:not(.flipped .flashcard-inner) {
  transform:translateY(-6px) scale(1.03);
}
.flashcard.flipped:hover .flashcard-inner {
  transform:rotateY(180deg) translateY(-4px) scale(1.02);
}

.flashcard-front, .flashcard-back {
  position:absolute;top:0;left:0;width:100%;height:100%;
  backface-visibility:hidden;
  -webkit-backface-visibility:hidden;
  border-radius:18px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:32px 24px;box-sizing:border-box;
  box-shadow:0 8px 24px -4px rgba(0,0,0,0.12), 0 4px 8px -4px rgba(0,0,0,0.06);
  border:none;
  transition:box-shadow 0.3s ease, transform 0.3s ease;
}

/* Dynamic hover glow matched to card color */
.flashcard-container:nth-child(6n+1) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(250,204,21,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }
.flashcard-container:nth-child(6n+2) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(248,113,113,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }
.flashcard-container:nth-child(6n+3) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(74,222,128,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }
.flashcard-container:nth-child(6n+4) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(96,165,250,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }
.flashcard-container:nth-child(6n+5) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(251,146,60,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }
.flashcard-container:nth-child(6n+6) .flashcard:hover .flashcard-front { box-shadow:0 16px 48px -8px rgba(192,132,252,0.45), 0 8px 16px -4px rgba(0,0,0,0.1); }

/* ── Vibrant Card Colors via nth-child ── */
.flashcard-container:nth-child(6n+1) .flashcard-front { background:linear-gradient(145deg,#facc15,#eab308); }
.flashcard-container:nth-child(6n+2) .flashcard-front { background:linear-gradient(145deg,#f87171,#ef4444); }
.flashcard-container:nth-child(6n+3) .flashcard-front { background:linear-gradient(145deg,#4ade80,#22c55e); }
.flashcard-container:nth-child(6n+4) .flashcard-front { background:linear-gradient(145deg,#60a5fa,#3b82f6); }
.flashcard-container:nth-child(6n+5) .flashcard-front { background:linear-gradient(145deg,#fb923c,#f97316); }
.flashcard-container:nth-child(6n+6) .flashcard-front { background:linear-gradient(145deg,#c084fc,#a855f7); }

.fc-index {
  position:absolute;top:16px;left:20px;
  font-size:1.8rem;font-weight:900;
  color:rgba(0,0,0,0.12);
  letter-spacing:-0.02em;
}
.fc-icon {
  font-size:2.4rem;margin-bottom:12px;
  filter:drop-shadow(0 2px 4px rgba(0,0,0,0.15));
  color:rgba(0,0,0,0.4);
  transition:transform 0.3s ease;
}
.flashcard:hover .fc-icon { transform:scale(1.1); }
.fc-title {
  font-size:1.05rem;font-weight:800;
  color:#1a1a2e;text-align:center;
  margin:0;line-height:1.35;
  text-shadow:0 1px 2px rgba(255,255,255,0.25);
}
.fc-flip-badge {
  position:absolute;bottom:16px;left:50%;transform:translateX(-50%);
  background:rgba(255,255,255,0.4);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  padding:6px 16px;border-radius:24px;
  font-size:0.72rem;font-weight:700;
  color:#1a1a2e;
  display:flex;align-items:center;gap:5px;
  transition:all 0.25s ease;
  box-shadow:0 2px 8px rgba(0,0,0,0.08);
}
.flashcard:hover .fc-flip-badge {
  background:rgba(255,255,255,0.6);
  transform:translateX(-50%) translateY(-2px);
  box-shadow:0 4px 12px rgba(0,0,0,0.12);
}

/* ── Glassmorphism Card Back ── */
.flashcard-back {
  background:var(--card-bg);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transform:rotateY(180deg);
  text-align:left;
  align-items:flex-start;
  justify-content:flex-start;
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  border:1.5px solid var(--border);
  padding:28px 24px;
  height:100%;
  max-height:100%;
  box-sizing:border-box;
  pointer-events:auto;
}
.flashcard-back::-webkit-scrollbar { width:4px; }
.flashcard-back::-webkit-scrollbar-track { background:transparent; }
.flashcard-back::-webkit-scrollbar-thumb { background:var(--purple-200);border-radius:4px; }
.flashcard-back::-webkit-scrollbar-thumb:hover { background:var(--purple); }
.flashcard-answer {
  font-size:0.92rem;line-height:1.75;color:var(--text);
  word-wrap:break-word;white-space:normal;
  padding-bottom:24px;
}
.flashcard-answer h3 { font-size:1.1rem;color:var(--purple);margin-bottom:8px; }
.flashcard-answer h4 { font-size:0.95rem;color:var(--text);margin:12px 0 6px; }
.flashcard-answer ul { padding-left:18px;margin:6px 0; }
.flashcard-answer li { margin-bottom:4px; }
.flashcard-answer strong { color:var(--purple); }

/* Dark mode: soften card colors slightly */
[data-theme="dark"] .flashcard-front { filter:brightness(0.85) saturate(0.9); }
[data-theme="dark"] .flashcard-back { background:var(--card-bg);border-color:rgba(255,255,255,0.08); }
[data-theme="dark"] .fc-title { color:#f0f0f0; text-shadow:none; }
[data-theme="dark"] .fc-index { color:rgba(255,255,255,0.15); }
[data-theme="dark"] .fc-flip-badge { background:rgba(0,0,0,0.35);color:#e0e0e0;backdrop-filter:blur(8px); }
[data-theme="dark"] .fc-icon { color:rgba(255,255,255,0.4); }
[data-theme="dark"] .flashcard-answer h3 { color:#a78bfa; }
[data-theme="dark"] .flashcard-answer strong { color:#a78bfa; }


/* ══════════════════════════════════════════
   UI Component: Difficulty Badges (shadcn-style)
   ══════════════════════════════════════════ */
.badge {
  display:inline-flex;align-items:center;
  padding:3px 10px;border-radius:9999px;
  font-size:0.72rem;font-weight:600;
  letter-spacing:0.02em;
  border:1px solid transparent;
}
.badge-easy {
  background:rgba(16,185,129,0.1);color:#059669;
  border-color:rgba(16,185,129,0.2);
}
.badge-medium {
  background:rgba(245,158,11,0.1);color:#d97706;
  border-color:rgba(245,158,11,0.2);
}
.badge-hard {
  background:rgba(239,68,68,0.1);color:#dc2626;
  border-color:rgba(239,68,68,0.2);
}
[data-theme="dark"] .badge-easy {
  background:rgba(16,185,129,0.15);color:#34d399;
}
[data-theme="dark"] .badge-medium {
  background:rgba(245,158,11,0.15);color:#fbbf24;
}
[data-theme="dark"] .badge-hard {
  background:rgba(239,68,68,0.15);color:#f87171;
}

/* ══════════════════════════════════════════
   UI Component: Practice Solution Accordion
   ══════════════════════════════════════════ */
.practice-solution-toggle {
  cursor:pointer;font-size:0.82rem;font-weight:600;
  color:var(--purple);margin-top:12px;
  padding:6px 0;transition:var(--ease);
}
.practice-solution-toggle:hover { opacity:0.8; }
.practice-solution {
  max-height:0;overflow:hidden;
  transition:max-height 0.4s ease, padding 0.3s ease;
  font-size:0.85rem;line-height:1.7;
  color:var(--text-secondary);padding:0;
}
.practice-solution.open {
  max-height:600px;padding:12px 0;
}

/* ══════════════════════════════════════════
   UI Component: About Us Bento Grid
   ══════════════════════════════════════════ */
.about-bento {
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px;
}
.about-bento-wide { grid-column:1/-1; }
.about-bento-card {
  background:var(--card-bg);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:36px;
  transition:var(--ease);position:relative;overflow:hidden;
}
.about-bento-card::before {
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--purple),#06b6d4);
  opacity:0;transition:opacity 0.3s ease;
}
.about-bento-card:hover { border-color:var(--purple);transform:translateY(-2px); }
.about-bento-card:hover::before { opacity:1; }
.about-bento-icon {
  margin-bottom:14px;
  display:inline-flex;align-items:center;justify-content:center;
  width:48px;height:48px;border-radius:var(--radius-md);
  background:var(--purple-50);
  color:var(--purple);
  transition:transform 0.3s ease, color 0.3s ease, background 0.3s ease;
}
.about-bento-icon svg {
  width:24px;height:24px;
  stroke:var(--purple);fill:none;
  transition:stroke 0.3s ease, transform 0.4s cubic-bezier(0.34,1.56,0.64,1);
}
.about-bento-card:hover .about-bento-icon {
  background:var(--purple-100);
  transform:scale(1.1);
}
.about-bento-card:hover .about-bento-icon svg {
  stroke:var(--purple-dark);
  transform:rotate(-8deg) scale(1.1);
}
/* Specific icon animation overrides */
.about-bento-card:nth-child(1):hover .about-bento-icon svg { animation:iconFlicker 0.6s ease; }
.about-bento-card:nth-child(3):hover .about-bento-icon svg { animation:iconSpin 1.2s ease; }
.about-bento-card:nth-child(4):hover .about-bento-icon svg { animation:iconPulse 0.5s ease; }
@keyframes iconFlicker {
  0%,100% { opacity:1;transform:scale(1); }
  25% { opacity:0.6;transform:scale(0.95); }
  50% { opacity:1;transform:scale(1.12); }
  75% { opacity:0.8;transform:scale(1.05); }
}
@keyframes iconSpin {
  0% { transform:rotate(0deg); }
  100% { transform:rotate(360deg); }
}
@keyframes iconPulse {
  0%,100% { transform:scale(1); }
  50% { transform:scale(1.2); }
}
.about-bento-card h3 {
  font-size:1.15rem;font-weight:700;color:var(--text-dark);
  margin-bottom:10px;letter-spacing:-0.01em;
}
.about-bento-card p {
  font-size:0.9rem;line-height:1.8;color:var(--text-secondary);
}
@media(max-width:768px) {
  .about-bento { grid-template-columns:1fr; }
  .about-bento-wide { grid-column:auto; }
}

/* ── Donate Button Shine ── */
.btn-donate {
  position:relative;overflow:hidden;
}
.btn-donate::after {
  content:'';position:absolute;top:0;left:-100%;
  width:60%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);
  animation:donateShine 3s ease-in-out infinite;
}
@keyframes donateShine {
  0%{left:-100%}
  50%{left:150%}
  100%{left:150%}
}


/* ══════════════════════════════════════════
   UI Component: Contact Form (shadcn-style)
   ══════════════════════════════════════════ */
.contact-form {
  max-width:600px;margin:0 auto;
}
.form-group {
  margin-bottom:20px;
}
.form-group label {
  display:block;font-size:0.82rem;font-weight:600;
  color:var(--text-dark);margin-bottom:6px;
}
.form-input, .form-textarea {
  width:100%;padding:10px 14px;border-radius:var(--radius-md);
  border:1.5px solid var(--border);
  background:var(--card-bg);color:var(--text-dark);
  font-size:0.88rem;font-family:inherit;
  transition:var(--ease);box-sizing:border-box;
}
.form-input:focus, .form-textarea:focus {
  outline:none;border-color:var(--purple);
  box-shadow:0 0 0 3px rgba(99,102,241,0.15);
}
.form-textarea { min-height:140px;resize:vertical; }
.form-submit {
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:var(--radius-md);
  background:var(--purple);color:#fff;
  font-weight:600;font-size:0.88rem;
  border:none;cursor:pointer;transition:var(--ease);
}
.form-submit:hover {
  background:var(--purple-dark);transform:translateY(-1px);
  box-shadow:0 4px 16px rgba(99,102,241,0.3);
}

/* ══════════════════════════════════════════
   Immersive Branding: Logo Lockup
   ══════════════════════════════════════════ */
.logo-lockup {
  transition: filter 0.3s ease, transform 0.3s ease;
}
.nav-logo:hover .logo-lockup {
  filter: drop-shadow(0 0 8px rgba(99,102,241,0.5));
  transform: scale(1.03);
}
.nav-logo {
  display:inline-flex;align-items:center;gap:0;
}

/* ══════════════════════════════════════════
   Immersive Branding: Animated Pill Toggle
   ══════════════════════════════════════════ */
.dark-toggle-pill {
  position:relative;
  width:40px;height:40px;
  border-radius:var(--radius-full);
  border:1.5px solid var(--border);
  background:var(--card-bg);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:all 0.35s cubic-bezier(0.4,0,0.2,1);
  overflow:hidden;
  padding:0;
  color:var(--text);
}
.dark-toggle-pill:hover {
  border-color:var(--purple);
  box-shadow:0 0 12px rgba(99,102,241,0.25);
  transform:scale(1.08);
}
.toggle-icon {
  position:absolute;
  display:flex;align-items:center;justify-content:center;
  transition:all 0.4s cubic-bezier(0.4,0,0.2,1);
}
.toggle-sun {
  opacity:1;transform:rotate(0deg) scale(1);
}
.toggle-moon {
  opacity:0;transform:rotate(-90deg) scale(0.5);
}
/* Dark mode: swap icons */
[data-theme="dark"] .toggle-sun {
  opacity:0;transform:rotate(90deg) scale(0.5);
}
[data-theme="dark"] .toggle-moon {
  opacity:1;transform:rotate(0deg) scale(1);
}
[data-theme="dark"] .dark-toggle-pill {
  background:rgba(30,30,45,0.7);
  border-color:rgba(129,140,248,0.2);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
[data-theme="dark"] .dark-toggle-pill:hover {
  border-color:var(--purple);
  box-shadow:0 0 16px rgba(129,140,248,0.35);
}

/* ══════════════════════════════════════════
   Immersive Module Tabs: Glassmorphic Grid
   ══════════════════════════════════════════ */
.immersive-tabs,
.module-tabs {
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  gap:6px;
  width:fit-content;
  margin-left:auto;
  margin-right:auto;
  background:rgba(255,255,255,0.04);
  padding:6px;
  border-radius:16px;
  border:1px solid var(--border);
  box-shadow:inset 0 2px 4px rgba(0,0,0,0.1);
  margin-bottom:12px;
}

.module-tab {
  flex:0 1 auto;
  border:none;
  background:transparent;
  border-radius:12px;
  color:var(--text);
  font-size:0.85rem;
  font-weight:600;
  cursor:pointer;
  transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space:nowrap;
  outline:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:12px 14px;
}
.module-tab:hover:not(.active) {
  background:rgba(124,58,237,0.06);
  transform:none;
  box-shadow:none;
}
.module-tab.active {
  background:var(--card-bg);
  color:var(--purple);
  border-color:transparent;
  box-shadow:0 4px 10px rgba(0,0,0,0.15), 0 0 0 1px var(--border);
  transform:translateY(0);
}
.module-tab svg {
  width:14px;height:14px;flex-shrink:0;
}

/* Module Panels */
.module-panel { display:none; }
.module-panel.active {
  display:block;
  animation:fadeSlideIn 0.35s ease;
}
@keyframes fadeSlideIn {
  from { opacity:0; transform:translateY(10px); }
  to { opacity:1; transform:translateY(0); }
}

/* Dark Mode Tab Polish */
[data-theme="dark"] .immersive-tabs,
[data-theme="dark"] .module-tabs {
  background:rgba(15,15,20,0.5);
  border-color:rgba(255,255,255,0.06);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
[data-theme="dark"] .module-tab:hover:not(.active) {
  background:rgba(124,58,237,0.1);
}
[data-theme="dark"] .module-tab.active {
  background:rgba(30,30,40,0.9);
  color:#a78bfa;
  box-shadow:0 4px 12px rgba(0,0,0,0.3), 0 0 0 1px rgba(124,58,237,0.3);
}

@media(max-width:768px){
  .immersive-tabs,.module-tabs{grid-template-columns:repeat(auto-fit, minmax(100px, 1fr));gap:4px;padding:4px;}
  .module-tab{padding:10px 10px;font-size:0.8rem;}
}

/* ══════════════════════════════════════════
   Immersive Branding: Inline SVG Icon Utils
   ══════════════════════════════════════════ */
.cb-icon { display:inline-flex;align-items:center;vertical-align:middle; }
.cb-icon svg { width:16px;height:16px; }

/* Section badge inline SVG sizing */
.section-badge svg,
.page-hero .section-badge svg {
  width:16px;height:16px;
  vertical-align:-2px;
  margin-right:2px;
}

/* Course meta inline SVG */
.course-meta svg {
  width:14px;height:14px;
  vertical-align:-2px;
  opacity:0.7;
}

/* Resource icon area SVG sizing */
.resource-icon svg {
  width:24px;height:24px;
}

/* Stars in testimonials */
.testimonial-stars svg {
  width:16px;height:16px;
  color:#FBBF24;
  margin-right:1px;
}

/* Donate button heart SVG */
.nav-signup-btn svg {
  width:14px;height:14px;
  vertical-align:-1px;
  color:#ef4444;
}

/* Footer heart pulse animation */
.heart { display:inline-flex;align-items:center; }
.heart-svg {
  animation:heartPulse 1.5s ease-in-out infinite;
}
@keyframes heartPulse {
  0%,100% { transform:scale(1); }
  50% { transform:scale(1.2); }
}

/* CTA button SVG icons */
.btn svg, .btn-cta svg, .form-submit svg {
  width:16px;height:16px;
  vertical-align:-2px;
}

/* Topic page icon sizing */
#topicNum svg {
  width:18px;height:18px;
  vertical-align:-3px;
}

/* Form select option SVG — won't render inside <option> but we style anyway */
.form-input svg { width:14px;height:14px; }

/* ══════════════════════════════════════════
   Fix: Donate Button Heart Alignment
   ══════════════════════════════════════════ */
.btn-donate {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
}
.btn-donate svg {
  width:20px !important;
  height:20px !important;
  vertical-align:middle;
  flex-shrink:0;
}

/* ══════════════════════════════════════════
   Immersive Typography Logo
   ══════════════════════════════════════════ */
.immersive-logo {
  font-family:'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  font-size:1.55rem;
  font-weight:800;
  letter-spacing:-0.8px;
  color:var(--text);
  white-space:nowrap;
  cursor:pointer;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
}
.immersive-logo .brand-base {
  background:linear-gradient(135deg, #7C3AED, #6366F1, #06B6D4);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  position:relative;
  padding-right:4px;
}

/* Hover shimmer effect */
.immersive-logo:hover .brand-base {
  animation:logoGlow 1.5s ease-in-out infinite alternate;
}
@keyframes logoGlow {
  0% { filter:drop-shadow(0px 0px 4px rgba(124,58,237,0.4)); }
  100% { filter:drop-shadow(0px 0px 12px rgba(6,182,212,0.8)); }
}

/* ══════════════════════════════════════════════
   IMMERSIVE READER — Explanation View
   shadcn-ui inspired typography & spacing
   ══════════════════════════════════════════════ */
.prose-immersive {
  max-width:820px;
  margin:0 auto;
  display:flex;
  flex-direction:column;
  gap:2.5rem;
}

.immersive-article {
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:2rem 2.25rem;
  transition:border-color var(--ease), box-shadow var(--ease);
}
.immersive-article:hover {
  border-color:var(--purple-border);
  box-shadow:0 0 0 1px var(--purple-50), var(--shadow);
}

.immersive-article-header {
  display:flex;
  align-items:center;
  gap:0.75rem;
  margin-bottom:1.5rem;
  padding-bottom:1rem;
  border-bottom:1px solid var(--border);
}
.immersive-topic-id {
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:2.25rem;
  height:2.25rem;
  border-radius:var(--radius-sm);
  background:var(--purple-50);
  color:var(--purple);
  font-weight:700;
  font-size:0.82rem;
  font-family:'Plus Jakarta Sans', sans-serif;
  letter-spacing:0.3px;
  flex-shrink:0;
}
.immersive-topic-title {
  font-family:'Plus Jakarta Sans', sans-serif;
  font-size:1.2rem;
  font-weight:700;
  color:var(--text-dark);
  letter-spacing:-0.3px;
  line-height:1.4;
}

/* — Body Typography — */
.immersive-text-body {
  font-family:'DM Sans', sans-serif;
  font-size:0.95rem;
  line-height:1.8;
  color:var(--text);
}
.immersive-text-body h3 {
  font-family:'Plus Jakarta Sans', sans-serif;
  font-size:1.1rem;
  font-weight:700;
  color:var(--text-dark);
  margin:1.75em 0 0.6em;
  letter-spacing:-0.2px;
}
.immersive-text-body h4 {
  font-family:'Plus Jakarta Sans', sans-serif;
  font-size:0.98rem;
  font-weight:600;
  color:var(--text-dark);
  margin:1.4em 0 0.5em;
}
.immersive-text-body p {
  margin-bottom:0.9em;
  color:var(--text-secondary);
  line-height:1.8;
}
.immersive-text-body ul,
.immersive-text-body ol {
  padding-left:1.35em;
  margin-bottom:1em;
}
.immersive-text-body li {
  margin-bottom:0.45em;
  color:var(--text);
  line-height:1.7;
}
.immersive-text-body li strong {
  color:var(--text-dark);
}
.immersive-text-body em {
  color:var(--text-muted);
  font-style:italic;
}
.immersive-text-body pre,
.immersive-text-body code {
  font-family:'JetBrains Mono', 'Fira Code', monospace;
  font-size:0.85rem;
  background:var(--purple-50);
  color:var(--purple);
  padding:0.15em 0.4em;
  border-radius:4px;
}
.immersive-text-body pre {
  padding:1rem 1.25rem;
  border-radius:var(--radius-sm);
  overflow-x:auto;
  margin:1em 0;
  border:1px solid var(--border);
}
.immersive-text-body pre code {
  background:none;
  padding:0;
  color:var(--text);
}
.immersive-text-body table {
  width:100%;
  border-collapse:collapse;
  margin:1em 0;
  font-size:0.88rem;
}
.immersive-text-body th,
.immersive-text-body td {
  padding:0.6em 0.8em;
  border:1px solid var(--border);
  text-align:left;
}
.immersive-text-body th {
  background:var(--purple-50);
  font-weight:600;
  color:var(--text-dark);
}

@media (max-width:640px) {
  .prose-immersive { gap:1.5rem; }
  .immersive-article { padding:1.25rem 1rem; }
  .immersive-topic-title { font-size:1.05rem; }
  .immersive-text-body { font-size:0.9rem; }
  .immersive-text-body table { display:block; overflow-x:auto; max-width:100%; }
}

/* ══════════════════════════════════════════════
   IMMERSIVE REVISION NOTES — shadcn Card Style
   ══════════════════════════════════════════════ */
.revision-immersive-grid {
  max-width:820px;
  margin:0 auto;
  display:flex;
  flex-direction:column;
  gap:1.25rem;
}
.revision-immersive-card {
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:1.5rem 1.75rem;
  transition:border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}
.revision-immersive-card:hover {
  border-color:var(--purple-border);
  box-shadow:0 0 0 1px var(--purple-50), var(--shadow);
  transform:translateY(-2px);
}

.revision-card-header {
  display:flex;
  align-items:center;
  gap:0.65rem;
  margin-bottom:1rem;
}
.revision-icon-wrapper {
  display:flex;
  align-items:center;
  justify-content:center;
  width:2rem;
  height:2rem;
  border-radius:var(--radius-sm);
  background:var(--purple-50);
  color:var(--purple);
  flex-shrink:0;
}
.revision-card-title {
  font-family:'Plus Jakarta Sans', sans-serif;
  font-size:1rem;
  font-weight:700;
  color:var(--text-dark);
  letter-spacing:-0.2px;
}

.revision-card-list {
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:0.55rem;
}
.revision-card-list li {
  display:flex;
  align-items:flex-start;
  gap:0.6rem;
  font-size:0.9rem;
  line-height:1.65;
  color:var(--text);
}
.revision-bullet {
  margin-top:0.55em;
  width:6px;
  height:6px;
  min-width:6px;
  border-radius:50%;
  background:var(--purple);
  opacity:0.7;
  flex-shrink:0;
}
.revision-text {
  flex:1;
}

@media (max-width:640px) {
  .revision-immersive-card { padding:1.15rem 1rem; }
  .revision-card-title { font-size:0.93rem; }
}