/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0a;
  --surface: #1a1a1a;
  --surface-hover: #252525;
  --gold: #d4a853;
  --gold-dark: #b8922e;
  --text: #e5e5e5;
  --text-muted: #999;
  --radius: 10px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 40px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent);
  transition: background 0.3s;
}

.header.scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
}

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

.logo {
  font-size: 28px;
  font-weight: 800;
  color: var(--gold);
  letter-spacing: -1px;
}

.header-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-muted);
}

/* Hero */
.hero {
  position: relative;
  height: 400px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  display: flex;
  align-items: flex-end;
  padding: 60px 40px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(212, 168, 83, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(212, 168, 83, 0.08) 0%, transparent 50%);
}

.hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--bg), transparent);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--gold);
  color: #000;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 0%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Content */
.content {
  padding: 40px 40px 60px;
  max-width: 1400px;
  margin: 0 auto;
}

.section {
  margin-bottom: 48px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gold);
  display: inline-block;
}

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

/* Cards */
.card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 40px rgba(212, 168, 83, 0.15);
}

.card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card-thumb img {
  transform: scale(1.08);
}

.card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 60px;
  height: 60px;
  background: rgba(212, 168, 83, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
}

.card:hover .card-play {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.card-play svg {
  width: 24px;
  height: 24px;
  fill: #000;
  margin-left: 3px;
}

.card-number {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
}

.card-body {
  padding: 16px;
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

.card-tags {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: rgba(212, 168, 83, 0.12);
  color: var(--gold);
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
}

.tag svg {
  width: 12px;
  height: 12px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  width: 90%;
  max-width: 900px;
  background: var(--surface);
  border-radius: 16px;
  overflow: hidden;
  transform: translateY(30px) scale(0.95);
  transition: transform 0.3s ease;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.8);
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
}

.video-container iframe {
  width: 100%;
  height: 100%;
}

.modal-info {
  padding: 24px 28px 28px;
}

.modal-info h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.modal-info p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 20px;
}

.modal-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-download {
  background: var(--gold);
  color: #000;
}

.btn-download:hover {
  background: var(--gold-dark);
  transform: translateY(-1px);
}

.btn-docs {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-docs:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

/* Footer */
.footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    padding: 14px 20px;
  }

  .hero {
    height: 300px;
    padding: 40px 20px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .content {
    padding: 24px 16px 40px;
  }

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

  .modal {
    width: 95%;
    border-radius: 12px;
  }

  .modal-info {
    padding: 16px 20px 20px;
  }

  .modal-actions {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 26px;
  }

  .hero p {
    font-size: 14px;
  }

  .section-title {
    font-size: 18px;
  }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}