/* ============================================
   ByteEdu Mentorship Platform - Main Stylesheet
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&family=Space+Mono:wght@400;700&display=swap');

/* ============ CSS VARIABLES ============ */
:root {
  --primary: #34c1c6;
  --primary-dark: #28a8ad;
  --primary-light: #e0f7f8;
  --primary-glow: rgba(52, 193, 198, 0.25);
  --accent: #ff6b6b;
  --accent2: #ffd166;
  --bg: #f8fbfc;
  --bg-card: #ffffff;
  --bg-alt: #f0f9fa;
  --text-primary: #0f2027;
  --text-secondary: #4a6572;
  --text-muted: #8ba3ad;
  --border: #e2eff1;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
  --shadow-primary: 0 8px 30px rgba(52,193,198,0.30);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --font: 'Poppins', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --nav-height: 72px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============ DARK MODE ============ */
[data-theme="dark"] {
  --bg: #0a1628;
  --bg-card: #111e35;
  --bg-alt: #0d1f38;
  --text-primary: #e8f4f8;
  --text-secondary: #8fafc0;
  --text-muted: #4a6880;
  --border: #1e3248;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
}

/* ============ RESET & BASE ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: var(--font); }
ul { list-style: none; }

/* ============ LOADER ============ */
#loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#loader.hidden { opacity: 0; visibility: hidden; }

.loader-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.loader-logo {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -1px;
}

.loader-bar {
  width: 200px;
  height: 4px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}

.loader-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 99px;
  animation: loadFill 1.4s ease forwards;
}

@keyframes loadFill {
  from { width: 0; }
  to { width: 100%; }
}

/* ============ NAVBAR ============ */
nav {
  position: sticky;
  top: 0;
  height: var(--nav-height);
  background: rgba(248, 251, 252, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
  transition: var(--transition);
}

[data-theme="dark"] nav {
  background: rgba(10, 22, 40, 0.85);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.nav-logo span { color: var(--text-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  background: var(--primary-light);
}

[data-theme="dark"] .nav-links a:hover,
[data-theme="dark"] .nav-links a.active {
  background: rgba(52,193,198,0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-theme {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
  color: var(--text-secondary);
}

.btn-theme:hover { background: var(--primary-light); color: var(--primary); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 16px 24px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--primary); background: var(--primary-light); }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(52,193,198,0.45);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--bg-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--primary-light); color: var(--primary); }

.btn-sm { padding: 8px 16px; font-size: 0.82rem; }
.btn-lg { padding: 16px 36px; font-size: 1rem; border-radius: var(--radius-md); }

/* ============ CONTAINER ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ SECTION HEADERS ============ */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

[data-theme="dark"] .section-label { background: rgba(52,193,198,0.12); }

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-top: 12px;
}

.section-head { margin-bottom: 56px; }
.section-head.center { text-align: center; }
.section-head.center .section-subtitle { margin: 12px auto 0; }

/* ============ HERO ============ */
.hero {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(52,193,198,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,107,107,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  animation: fadeInDown 0.6s ease both;
}

.hero-badge .dot {
  width: 8px; height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.5); }
  50% { box-shadow: 0 0 0 6px rgba(34,197,94,0); }
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 20px;
  animation: fadeInUp 0.7s 0.1s ease both;
}

.hero-title .highlight {
  color: var(--primary);
  position: relative;
}

.hero-title .highlight::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  opacity: 0.4;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.75;
  animation: fadeInUp 0.7s 0.2s ease both;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s 0.3s ease both;
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  animation: fadeInUp 0.7s 0.4s ease both;
}

.hero-stat strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.hero-stat span {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero Visual */
.hero-visual {
  position: relative;
  animation: fadeInRight 0.8s 0.2s ease both;
}

.hero-card-main {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: relative;
  z-index: 2;
}

.hero-card-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.avatar-group { display: flex; }
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--bg-card);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  margin-left: -8px;
}
.avatar:first-child { margin-left: 0; }

.hero-card-text strong { font-size: 0.9rem; color: var(--text-primary); }
.hero-card-text span { font-size: 0.78rem; color: var(--text-muted); }

.project-list { display: flex; flex-direction: column; gap: 12px; }

.project-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.project-item:hover { transform: translateX(4px); }

.project-left { display: flex; align-items: center; gap: 12px; }
.project-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.project-name { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }
.project-day { font-size: 0.75rem; color: var(--text-muted); }

.status-badge {
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 600;
}
.status-badge.done { background: #dcfce7; color: #16a34a; }
.status-badge.live { background: #fef3c7; color: #d97706; }
.status-badge.soon { background: var(--primary-light); color: var(--primary); }

[data-theme="dark"] .status-badge.done { background: rgba(22,163,74,0.15); }
[data-theme="dark"] .status-badge.live { background: rgba(217,119,6,0.15); }
[data-theme="dark"] .status-badge.soon { background: rgba(52,193,198,0.15); }

.hero-float-card {
  position: absolute;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  animation: floatAnim 4s ease-in-out infinite;
}

.hero-float-card.top-left {
  top: -20px;
  left: -30px;
  animation-delay: 0s;
}

.hero-float-card.bottom-right {
  bottom: 20px;
  right: -24px;
  animation-delay: 2s;
}

@keyframes floatAnim {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-stat strong { font-size: 1.4rem; font-weight: 800; color: var(--primary); }
.float-stat span { font-size: 0.75rem; color: var(--text-muted); display: block; }

/* ============ FEATURES ============ */
.features { padding: 100px 0; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.feature-card:hover::before { transform: scaleX(1); }

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  transition: var(--transition);
}

[data-theme="dark"] .feature-icon { background: rgba(52,193,198,0.12); }

.feature-card:hover .feature-icon { transform: scale(1.1); }

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============ SESSIONS PREVIEW ============ */
.sessions-preview { padding: 100px 0; background: var(--bg-alt); }

.sessions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.session-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.session-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.session-card-head {
  padding: 24px 24px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.session-num {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.session-status { }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge-upcoming { background: var(--primary-light); color: var(--primary); }
.badge-completed { background: #dcfce7; color: #16a34a; }
.badge-live { background: #fef3c7; color: #d97706; }

[data-theme="dark"] .badge-upcoming { background: rgba(52,193,198,0.12); }
[data-theme="dark"] .badge-completed { background: rgba(22,163,74,0.12); }
[data-theme="dark"] .badge-live { background: rgba(217,119,6,0.12); }

.session-card-body { padding: 20px 24px; }

.session-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.session-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.session-meta span { display: flex; align-items: center; gap: 5px; }

.session-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.65;
}

.session-card-foot {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.countdown {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

[data-theme="dark"] .countdown { background: rgba(52,193,198,0.1); }

/* ============ TESTIMONIALS ============ */
.testimonials { padding: 100px 0; }

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial-quote {
  font-size: 2.5rem;
  color: var(--primary);
  font-family: Georgia, serif;
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.4;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.author-name { font-weight: 700; font-size: 0.9rem; }
.author-role { font-size: 0.78rem; color: var(--text-muted); }

.stars {
  position: absolute;
  top: 28px;
  right: 28px;
  color: var(--accent2);
  font-size: 0.8rem;
}

/* ============ FOOTER ============ */
footer {
  background: var(--text-primary);
  color: rgba(255,255,255,0.85);
  padding: 64px 0 32px;
}

[data-theme="dark"] footer {
  background: #060e1a;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); }
.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  margin-top: 12px;
  line-height: 1.75;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}

.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col ul a:hover { color: var(--primary); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

/* ============ SESSIONS PAGE ============ */
.page-hero {
  padding: 64px 0 48px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.page-hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.filter-tab {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: none;
}

.filter-tab.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(52,193,198,0.4);
}

.sessions-full { padding: 64px 0; }

.sessions-full-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.session-card-full {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.session-card-full:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.session-card-full .session-card-head { flex-shrink: 0; }
.session-card-full .session-card-body { flex: 1; }

.session-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ============ DETAIL PAGE ============ */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 32px;
  padding: 64px 0;
  align-items: start;
}

.detail-main { }

.detail-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.detail-header {
  margin-bottom: 32px;
}

.detail-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 16px 0 12px;
}

.detail-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
}

.detail-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.detail-meta-item .icon {
  width: 32px;
  height: 32px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="dark"] .detail-meta-item .icon { background: rgba(52,193,198,0.1); }

.detail-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

.detail-section { margin-bottom: 40px; }
.detail-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.detail-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

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

.resource-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.resource-item:hover { border-color: var(--primary); background: var(--primary-light); }
[data-theme="dark"] .resource-item:hover { background: rgba(52,193,198,0.08); }

.resource-left { display: flex; align-items: center; gap: 12px; }
.resource-icon { font-size: 1.2rem; }
.resource-name { font-size: 0.88rem; font-weight: 600; }
.resource-size { font-size: 0.78rem; color: var(--text-muted); }

/* Sidebar Card */
.sidebar-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.sidebar-card-body { padding: 28px; }

.sidebar-price {
  margin-bottom: 20px;
}

.price-free {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
}

.price-note {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.sidebar-feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.sidebar-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.sidebar-feature .check {
  width: 20px;
  height: 20px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--primary);
  flex-shrink: 0;
}

[data-theme="dark"] .sidebar-feature .check { background: rgba(52,193,198,0.12); }

/* ============ DASHBOARD ============ */
.dashboard-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - var(--nav-height));
}

.dashboard-sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  padding: 32px 0;
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
}

.dash-nav-group { padding: 0 16px; margin-bottom: 24px; }
.dash-nav-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 12px;
  margin-bottom: 8px;
}

.dash-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  cursor: pointer;
  margin-bottom: 2px;
}

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

[data-theme="dark"] .dash-nav-link:hover,
[data-theme="dark"] .dash-nav-link.active {
  background: rgba(52,193,198,0.1);
}

.dash-nav-link .icon { font-size: 1rem; }

.dashboard-main {
  padding: 40px;
  background: var(--bg);
}

.dash-header { margin-bottom: 36px; }
.dash-welcome { font-size: 1.5rem; font-weight: 800; margin-bottom: 4px; }
.dash-subtitle { color: var(--text-muted); font-size: 0.9rem; }

.dash-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.dash-stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.dash-stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.dash-stat-card .label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
.dash-stat-card .value { font-size: 2rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.03em; }
.dash-stat-card .sub { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }
.dash-stat-card.primary-card { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: white; }
.dash-stat-card.primary-card .label,
.dash-stat-card.primary-card .value,
.dash-stat-card.primary-card .sub { color: white; }
.dash-stat-card.primary-card .value { opacity: 1; }

.progress-section { margin-bottom: 36px; }
.progress-title { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }

.progress-bar-wrap { background: var(--bg-alt); border-radius: 99px; height: 12px; overflow: hidden; margin-bottom: 8px; }
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 99px;
  transition: width 1s ease;
}

.progress-label { display: flex; justify-content: space-between; font-size: 0.82rem; color: var(--text-muted); }

.dash-enrolled-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.enrolled-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: var(--transition);
}

.enrolled-card:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }

.enrolled-info { flex: 1; }
.enrolled-title { font-size: 0.9rem; font-weight: 700; margin-bottom: 4px; }
.enrolled-date { font-size: 0.78rem; color: var(--text-muted); }

/* ============ REGISTRATION PAGE ============ */
.auth-layout {
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  background: var(--bg-alt);
}

.auth-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 48px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
}

.auth-logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); margin-bottom: 32px; }

.auth-title { font-size: 1.8rem; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 6px; }
.auth-subtitle { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 32px; }

.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--text-primary);
  font-size: 0.92rem;
  transition: var(--transition);
  outline: none;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-input.error { border-color: var(--accent); }

.form-error {
  font-size: 0.78rem;
  color: var(--accent);
  margin-top: 6px;
  display: none;
}

.form-error.show { display: block; }

.form-input-wrap { position: relative; }
.form-input-wrap .form-input { padding-left: 44px; }
.form-input-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  color: var(--text-muted);
  pointer-events: none;
}

.auth-divider {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 20px 0;
  position: relative;
}

.auth-divider::before, .auth-divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: calc(50% - 24px);
  height: 1px;
  background: var(--border);
}
.auth-divider::before { left: 0; }
.auth-divider::after { right: 0; }

.auth-footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 20px;
}

.auth-footer a { color: var(--primary); font-weight: 600; }

.success-msg {
  background: #dcfce7;
  border: 1px solid #86efac;
  color: #15803d;
  padding: 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  display: none;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.success-msg.show { display: flex; }

[data-theme="dark"] .success-msg {
  background: rgba(22,163,74,0.12);
  border-color: rgba(22,163,74,0.3);
  color: #4ade80;
}

/* ============ ANIMATIONS ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal-stagger.visible > *:nth-child(1) { opacity: 1; transform: none; transition-delay: 0s; }
.reveal-stagger.visible > *:nth-child(2) { opacity: 1; transform: none; transition-delay: 0.1s; }
.reveal-stagger.visible > *:nth-child(3) { opacity: 1; transform: none; transition-delay: 0.2s; }
.reveal-stagger.visible > *:nth-child(4) { opacity: 1; transform: none; transition-delay: 0.3s; }
.reveal-stagger.visible > *:nth-child(5) { opacity: 1; transform: none; transition-delay: 0.4s; }
.reveal-stagger.visible > *:nth-child(6) { opacity: 1; transform: none; transition-delay: 0.5s; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .sessions-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .detail-layout { grid-template-columns: 1fr; }
  .detail-sidebar { position: static; }
  .dash-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-layout { grid-template-columns: 220px 1fr; }
  .sessions-full-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .features-grid { grid-template-columns: 1fr; }
  .sessions-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .page-hero-inner { flex-direction: column; align-items: flex-start; }
  .dashboard-layout { grid-template-columns: 1fr; }
  .dashboard-sidebar { display: none; }
  .dashboard-main { padding: 24px; }
  .dash-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dash-enrolled-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 32px 24px; }
  .hero { padding: 48px 0; }
  .features, .sessions-preview, .testimonials { padding: 64px 0; }
}

@media (max-width: 480px) {
  .dash-stats-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .filter-tabs { flex-wrap: wrap; }
}

/* ============ UTILITY ============ */
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.fw-700 { font-weight: 700; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.hidden { display: none !important; }
.w-full { width: 100%; }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.justify-between { justify-content: space-between; }