:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #0f0f0f;
  --bg-card: #131313;
  --bg-card-hover: #1a1a1a;
  --accent: #39ff14;
  --accent-hover: #2ecc0e;
  --accent-glow: rgba(57, 255, 20, 0.25);
  --accent-cyan: #00e5ff;
  --text-primary: #e8e8e8;
  --text-secondary: #999999;
  --text-muted: #666666;
  --border: #222222;
  --border-hover: #39ff14;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.7);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'Fira Code', 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

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

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

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

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent);
  text-shadow: 0 0 8px rgba(57, 255, 20, 0.15);
}

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

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 10, 10, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0.6rem 1.5rem;
  background: rgba(10, 10, 10, 0.96);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent) !important;
  text-transform: uppercase;
  letter-spacing: 3px;
  text-decoration: none;
}

.nav-brand svg {
  width: 28px;
  height: 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ── Hero Section ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(57, 255, 20, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 229, 255, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(57, 255, 20, 0.03) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-2%, -1%) rotate(3deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.2);
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  color: #fff;
}

.hero-title span {
  color: var(--accent);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #000;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #000;
  text-shadow: none;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.82rem;
}

/* ── Stats Bar ── */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 3rem;
  padding: 3rem 1.5rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ── Sections ── */
.section {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.section-title {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 1rem;
  color: #fff;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 550px;
  margin: 0 auto;
}

/* ── Course Cards ── */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.course-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 0 24px rgba(57, 255, 20, 0.08);
}

.course-card-image {
  position: relative;
  height: 180px;
  overflow: hidden;
}

.course-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.course-card:hover .course-card-image img {
  transform: scale(1.05);
}

.course-card-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 0.25rem 0.7rem;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid rgba(57, 255, 20, 0.2);
}

.course-card-body {
  padding: 1.2rem;
}

.course-card-title {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  color: #fff;
}

.course-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
}

.course-card-price {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.course-card-price .original {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: line-through;
  font-weight: 400;
  margin-left: 0.4rem;
}

.course-card-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition);
}

.course-card-link:hover {
  gap: 0.6rem;
}

.course-card-btn {
  display: block !important;
  width: 100%;
  justify-content: center;
  margin-top: 0.8rem;
  text-align: center;
}

/* ── Course Detail ── */
.course-detail {
  padding: 6rem 1.5rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.course-detail-header {
  margin-bottom: 2rem;
}

.course-detail-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.course-detail-breadcrumb a {
  color: var(--accent);
}

.course-detail-breadcrumb span {
  margin: 0 0.5rem;
}

.course-detail-title {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
  color: #fff;
}

.course-detail-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.course-detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
}

.course-detail-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-detail-meta-item svg {
  color: var(--accent);
  flex-shrink: 0;
}

.course-detail-hero-image {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
}

.course-detail-hero-image img {
  width: 100%;
  height: 350px;
  object-fit: cover;
}

.course-detail-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2.5rem;
  align-items: start;
}

.course-detail-text h2 {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  margin-top: 1.8rem;
  color: var(--accent);
}

.course-detail-text h2:first-child {
  margin-top: 0;
}

.course-detail-text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 0.8rem;
}

.course-detail-text ul {
  list-style: none;
  margin-bottom: 1.2rem;
}

.course-detail-text ul li {
  padding: 0.4rem 0;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.course-detail-text ul li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── Sidebar Card ── */
.course-sidebar {
  position: sticky;
  top: 90px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 1.5rem;
}

.course-sidebar-price {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.course-sidebar-original {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: line-through;
  margin-bottom: 1.2rem;
}

.course-sidebar .btn-primary {
  width: 100%;
  justify-content: center;
  margin-bottom: 0.8rem;
}

.course-sidebar-features {
  list-style: none;
  margin-top: 1.2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}

.course-sidebar-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-sidebar-features li svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* ── Plans Grid ── */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto 3rem;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.plan-card:hover {
  transform: translateY(-3px);
  border-color: rgba(57, 255, 20, 0.3);
}

.plan-featured {
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(57, 255, 20, 0.08);
}

.plan-badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #000;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.9rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.plan-header {
  text-align: center;
  margin-bottom: 1.2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border);
}

.plan-name {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: #fff;
}

.plan-price {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
}

.plan-price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
}

.plan-tagline {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.plan-features {
  list-style: none;
  flex: 1;
  margin-bottom: 1.2rem;
}

.plan-features li {
  padding: 0.35rem 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.plan-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

.btn-plan {
  width: 100%;
  justify-content: center;
}

/* ── Subscription Form ── */
.subscription-form-wrapper {
  max-width: 460px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.form-title {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: #fff;
}

.form-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
}

.form-subtitle strong {
  color: var(--accent);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font);
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.1);
}

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

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-top: 3rem;
}

.footer a {
  color: var(--accent);
}

/* ── Not Found ── */
.not-found {
  text-align: center;
  padding: 10rem 1.5rem 3rem;
}

.not-found h1 {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1rem;
}

.not-found p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* ── Loading ── */
.loading {
  display: flex;
  justify-content: center;
  padding: 3rem;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(16px);
    padding: 1.2rem 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 5rem 1rem 3rem;
    min-height: auto;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .stats-bar {
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 2rem 1rem;
  }

  .stat-number {
    font-size: 1.4rem;
  }

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

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

  .course-sidebar {
    position: static;
  }

  .course-detail-hero-image img {
    height: 200px;
  }

  .plans-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
  }

  .subscription-form-wrapper {
    padding: 1.5rem;
  }

  .section {
    padding: 3rem 1rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .btn {
    padding: 0.7rem 1.4rem;
    font-size: 0.9rem;
  }
}