/* ============================================
   NovaMind Academy — Design System & Styles
   ============================================ */

/* ---------- Reset & Base ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
  --bg: #050510;
  --bg-card: #0c0c1a;
  --bg-card-hover: #0f0f22;
  --bg-elevated: #0c0c1a;
  --accent: #3B82F6;
  --accent-hover: #00D4FF;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --accent-glow-strong: rgba(59, 130, 246, 0.3);
  --text: #FFFFFF;
  --text-muted: #8892A0;
  --text-dim: #6B7280;
  --border: rgba(59,130,246,.15);
  --border-hover: #3B82F6;
  --success: #22C55E;
  --error: #EF4444;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

img {
  max-width: 100%;
  display: block;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  outline: none;
}

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

.container--narrow {
  max-width: 800px;
}

.container--wide {
  max-width: 1400px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

.text-gradient {
  background: linear-gradient(135deg, var(--accent) 0%, #00D4FF 50%, #E0F7FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.text-center { text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  color: #000;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow-strong);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--large {
  padding: 18px 48px;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

.btn--outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 8px 16px;
}

.btn--ghost:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.btn--block {
  width: 100%;
}

/* ---------- Navbar ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
}

.navbar__brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.navbar__links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.navbar__links a:hover {
  color: var(--text);
}

.navbar__cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  padding: 4px;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--bg), transparent);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 32px;
}

.hero__title {
  margin-bottom: 24px;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero__cta-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.hero__cta-note {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.hero__cta-note strong {
  color: var(--accent);
}

/* ---------- Stats Bar ---------- */
.stats-bar {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.stats-bar__grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 48px;
}

.stats-bar__item {
  text-align: center;
}

.stats-bar__value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stats-bar__label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Section ---------- */
.section {
  padding: 100px 0;
}

.section--alt {
  background: var(--bg-card);
}

.section__header {
  text-align: center;
  margin-bottom: 64px;
}

.section__header h2 {
  margin-bottom: 16px;
}

.section__header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section__eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}

/* ---------- Course Cards Grid ---------- */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.course-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.course-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: rgba(59, 130, 246, 0.1);
}

.course-card__badge {
  position: absolute;
  top: 16px;
  right: 16px;
}

.course-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.course-card__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.course-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.course-card__lessons {
  display: flex;
  align-items: center;
  gap: 6px;
}

.course-card__lock {
  color: var(--text-dim);
  font-size: 1rem;
}

.course-card__thumbnail {
  width: 100%;
  height: 180px;
  border-radius: var(--radius);
  object-fit: cover;
  margin-bottom: 16px;
  background: var(--bg-elevated);
}

/* ---------- Progress Bar ---------- */
.progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  overflow: hidden;
  margin-top: 16px;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #00D4FF);
  border-radius: 100px;
  transition: width 0.5s ease;
}

.progress-bar--success .progress-bar__fill {
  background: linear-gradient(90deg, var(--success), #4ADE80);
}

.progress-text {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ---------- Badge / Pill ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 100px;
}

.badge--exclusive {
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  color: #000;
}

.badge--new {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.badge--popular {
  background: rgba(59, 130, 246, 0.15);
  color: #3B82F6;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge--category {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* ---------- Checkmark ---------- */
.checkmark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--success);
  color: #fff;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.checkmark--empty {
  background: transparent;
  border: 2px solid var(--border);
}

/* ---------- Features Grid ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feature-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- Three Columns ---------- */
.three-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.col-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: all var(--transition);
}

.col-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}

.col-card__icon {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.col-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.col-card__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- Pricing ---------- */
.pricing-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  position: relative;
  box-shadow: 0 0 60px var(--accent-glow);
}

.pricing-card__popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  color: #000;
  padding: 6px 24px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-card__price {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  margin: 24px 0 8px;
}

.pricing-card__price-note {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.pricing-card__features {
  list-style: none;
  text-align: left;
  margin-bottom: 40px;
}

.pricing-card__features li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.95rem;
}

.pricing-card__features li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  font-size: 0.75rem;
  flex-shrink: 0;
}

.pricing-card__urgency {
  font-size: 0.85rem;
  color: var(--accent);
  margin-top: 20px;
  font-weight: 500;
}

/* ---------- Testimonials ---------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.testimonial-card__stars {
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-card__text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.testimonial-card__avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #000;
}

.testimonial-card__name {
  font-weight: 600;
  font-size: 0.9rem;
}

.testimonial-card__role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item__question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: color var(--transition);
}

.faq-item__question:hover {
  color: var(--accent);
}

.faq-item__icon {
  font-size: 1.25rem;
  color: var(--text-dim);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer p {
  padding-bottom: 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- CTA Section ---------- */
.cta-section {
  text-align: center;
  padding: 100px 24px;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section__content {
  position: relative;
  z-index: 1;
}

/* ---------- Footer ---------- */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 12px;
}

.footer__links a {
  color: var(--text-dim);
  transition: color var(--transition);
}

.footer__links a:hover {
  color: var(--text);
}

/* ============================================
   AUTH PAGES
   ============================================ */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
}

.auth-card__brand {
  text-align: center;
  margin-bottom: 32px;
}

.auth-card__brand-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 16px;
}

.auth-card__brand h1 {
  font-size: 1.5rem;
  font-weight: 800;
}

.auth-card__subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 8px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-muted);
}

.form-group input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-dim);
}

.form-error {
  color: var(--error);
  font-size: 0.8rem;
  margin-top: 6px;
  display: none;
}

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

.auth-card__footer {
  text-align: center;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.auth-card__footer a {
  color: var(--accent);
  font-weight: 500;
}

/* ============================================
   LESSON PAGE
   ============================================ */

/* Sidebar */
.lesson-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 100vh;
  padding-top: 73px;
}

.sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  height: calc(100vh - 73px);
  position: sticky;
  top: 73px;
}

.sidebar__header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar__course-title {
  font-size: 1rem;
  font-weight: 700;
}

.sidebar__progress {
  margin-top: 12px;
}

.sidebar__module {
  border-bottom: 1px solid var(--border);
}

.sidebar__module-header {
  width: 100%;
  background: none;
  border: none;
  color: var(--text);
  padding: 16px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition);
}

.sidebar__module-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.sidebar__module-chevron {
  transition: transform var(--transition);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.sidebar__module.expanded .sidebar__module-chevron {
  transform: rotate(90deg);
}

.sidebar__lessons {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.sidebar__module.expanded .sidebar__lessons {
  max-height: 1000px;
}

.sidebar__lesson {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px 10px 32px;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.sidebar__lesson:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.sidebar__lesson.active {
  color: var(--accent);
  background: var(--accent-glow);
}

.sidebar__lesson.completed {
  color: var(--success);
}

/* Content Area */
.lesson-content {
  padding: 48px;
  max-width: 860px;
}

.lesson-content__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.lesson-content__title {
  margin-bottom: 32px;
}

.lesson-content__body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.lesson-content__body h2,
.lesson-content__body h3 {
  color: var(--text);
  margin: 32px 0 16px;
}

.lesson-content__body p {
  margin-bottom: 16px;
}

.lesson-content__body code {
  background: var(--bg-elevated);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent);
}

.lesson-content__body pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 16px;
}

.lesson-content__body pre code {
  background: none;
  padding: 0;
}

.lesson-complete-btn {
  margin-top: 48px;
}

/* ---------- Audio Player ---------- */
.audio-player {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.audio-player__btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: all var(--transition);
}

.audio-player__btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.audio-player__info {
  flex: 1;
}

.audio-player__title {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.audio-player__track {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  overflow: hidden;
}

.audio-player__track-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 100px;
  width: 0%;
  transition: width 0.1s linear;
}

.audio-player__time {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ============================================
   CHATBOT WIDGET
   ============================================ */
.chatbot-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #00D4FF);
  color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 20px var(--accent-glow-strong);
  z-index: 9999;
  transition: all var(--transition);
}

.chatbot-toggle:hover {
  transform: scale(1.08);
}

.chatbot-panel {
  position: fixed;
  bottom: 96px;
  right: 24px;
  width: 380px;
  max-height: 520px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  z-index: 9998;
  opacity: 0;
  transform: translateY(16px) scale(0.95);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.chatbot-panel.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.chatbot-panel__header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chatbot-panel__title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chatbot-panel__status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}

.chatbot-panel__close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.25rem;
  padding: 4px;
  cursor: pointer;
  transition: color var(--transition);
}

.chatbot-panel__close:hover {
  color: var(--text);
}

.chatbot-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 300px;
}

.chat-message {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.5;
}

.chat-message--bot {
  align-self: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.chat-message--user {
  align-self: flex-end;
  background: var(--accent);
  color: #000;
  border-bottom-right-radius: 4px;
}

.chatbot-panel__input {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}

.chatbot-panel__input input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
}

.chatbot-panel__input input:focus {
  outline: none;
  border-color: var(--accent);
}

.chatbot-panel__input button {
  padding: 10px 16px;
  background: var(--accent);
  color: #000;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.chatbot-panel__input button:hover {
  background: var(--accent-hover);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .lesson-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: -300px;
    top: 73px;
    width: 300px;
    height: calc(100vh - 73px);
    z-index: 100;
    transition: left var(--transition);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
  }

  .sidebar-overlay.visible {
    opacity: 1;
    pointer-events: auto;
  }

  .lesson-content {
    padding: 32px 24px;
  }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }

  .navbar__links { display: none; }
  .mobile-toggle { display: block; }

  .navbar__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
  }

  .hero { padding: 100px 16px 60px; min-height: auto; }
  .hero__title { font-size: 2rem; }

  .stats-bar__grid { gap: 24px; }
  .stats-bar__item { flex: 1 1 120px; }

  .three-cols { grid-template-columns: 1fr; gap: 16px; }

  .courses-grid { grid-template-columns: 1fr; }

  .pricing-card { padding: 32px 24px; }
  .pricing-card__price { font-size: 2.5rem; }

  .section { padding: 60px 0; }

  .auth-card { padding: 32px 24px; }

  .chatbot-panel {
    right: 12px;
    left: 12px;
    width: auto;
    bottom: 88px;
  }

  .features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .btn--large {
    padding: 16px 32px;
    font-size: 1rem;
  }

  .hero__subtitle {
    font-size: 0.95rem;
  }

  .stats-bar__value {
    font-size: 1.25rem;
  }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.animate-in:nth-child(2) { animation-delay: 0.1s; }
.animate-in:nth-child(3) { animation-delay: 0.2s; }
.animate-in:nth-child(4) { animation-delay: 0.3s; }
.animate-in:nth-child(5) { animation-delay: 0.4s; }
.animate-in:nth-child(6) { animation-delay: 0.5s; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.loading-pulse {
  animation: pulse 1.5s ease infinite;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 100px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* Selection */
::selection {
  background: var(--accent);
  color: #000;
}

/* ============= LAUNCH BANNER (added 2026-04-21) ============= */
.launch-banner{position:sticky;top:0;z-index:100;background:linear-gradient(90deg,#050510,#0c0c1a,#050510);border-bottom:1px solid rgba(59,130,246,.3);padding:10px 16px;text-align:center;font-size:14px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.launch-banner strong{background:linear-gradient(135deg,#3B82F6,#00D4FF);-webkit-background-clip:text;-webkit-text-fill-color:transparent;font-weight:800}
.launch-banner .cd{font-family:"JetBrains Mono",monospace;font-weight:700;color:#00D4FF;margin-left:8px}

/* ============= LESSON TYPOGRAPHY POLISH (added 2026-04-21) ============= */
.lesson-body{font-size:17px;line-height:1.75;max-width:720px;margin:0 auto;color:rgba(255,255,255,.9)}
.lesson-body h1{font-size:32px;font-weight:800;letter-spacing:-.5px;margin:32px 0 16px;color:#fff}
.lesson-body h2{font-size:26px;font-weight:700;letter-spacing:-.3px;margin:40px 0 16px;padding-top:8px;color:#fff;border-bottom:1px solid rgba(59,130,246,.15);padding-bottom:10px}
.lesson-body h3{font-size:20px;font-weight:700;margin:32px 0 12px;color:#fff;display:flex;align-items:center;gap:10px}
.lesson-body h3::before{content:"";width:4px;height:18px;background:linear-gradient(180deg,#3B82F6,#00D4FF);border-radius:2px}
.lesson-body h4{font-size:17px;font-weight:600;margin:24px 0 10px;color:#00D4FF;text-transform:uppercase;letter-spacing:.5px}
.lesson-body p{margin:14px 0}
.lesson-body p strong{color:#fff;font-weight:700;background:linear-gradient(180deg,transparent 60%,rgba(0,212,255,.15) 60%);padding:0 2px}
.lesson-body ul,.lesson-body ol{margin:14px 0;padding-left:24px}
.lesson-body ul li,.lesson-body ol li{margin:8px 0;padding-left:4px}
.lesson-body ul li::marker{color:#3B82F6}
.lesson-body a{color:#00D4FF;text-decoration:none;border-bottom:1px solid rgba(0,212,255,.3);transition:all .15s}
.lesson-body a:hover{border-bottom-color:#00D4FF;background:rgba(0,212,255,.05)}
.lesson-body code{background:#0c0c1a;border:1px solid rgba(59,130,246,.15);padding:2px 8px;border-radius:4px;font-family:"JetBrains Mono",monospace;font-size:14px;color:#00D4FF}
.lesson-body pre{background:#0c0c1a;border:1px solid rgba(59,130,246,.15);border-radius:10px;padding:16px;overflow-x:auto;margin:20px 0}
.lesson-body pre code{background:none;border:none;padding:0;color:rgba(255,255,255,.9)}
.lesson-body blockquote{border-left:3px solid #3B82F6;background:rgba(59,130,246,.05);padding:14px 20px;margin:20px 0;border-radius:0 8px 8px 0;color:rgba(255,255,255,.85);font-style:italic}
.lesson-body hr{border:none;border-top:1px solid rgba(59,130,246,.15);margin:32px 0}
.lesson-body table{width:100%;border-collapse:collapse;margin:20px 0}
.lesson-body th,.lesson-body td{padding:10px 14px;text-align:left;border-bottom:1px solid rgba(59,130,246,.1)}
.lesson-body th{background:rgba(59,130,246,.05);font-weight:700;color:#00D4FF;font-size:13px;text-transform:uppercase;letter-spacing:.5px}
.lesson-body img{max-width:100%;border-radius:8px;margin:20px 0;border:1px solid rgba(59,130,246,.15)}
.lesson-body .em-dash{margin:0 4px}
.lesson-body .tip{background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.2);border-radius:10px;padding:16px 20px;margin:20px 0}
.lesson-body .tip::before{content:"💡 ";margin-right:6px}