:root {
    --bg-dark: #121216;
    --bg-card: #1c1c23;
    --text-main: #f2f2f7;
    --text-sub: #9b9ba8;
    --gold: #f5c451;
    --gold-hover: #ffd97a;
    --gold-dim: rgba(245, 196, 81, 0.15);
    --border: #2e2e38;
    --radius: 12px;
    --radius-sm: 8px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  }

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

  body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  a { text-decoration: none; color: inherit; }
  img { max-width: 100%; display: block; object-fit: cover; }

  /* Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(18, 18, 22, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
  }
  .logo-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--gold);
  }
  .logo-wrap img {
    height: 32px;
    width: auto;
    border-radius: 6px;
  }
  .main-nav {
    display: flex;
    gap: 24px;
  }
  .main-nav a {
    font-size: 15px;
    color: var(--text-sub);
    transition: color 0.2s;
    font-weight: 500;
  }
  .main-nav a:hover { color: var(--gold); }
  .header-cta {
    display: none;
    background: var(--gold);
    color: #111;
    padding: 8px 18px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
    transition: background 0.2s;
  }
  .header-cta:hover { background: var(--gold-hover); }

  /* Hero */
  .hero {
    position: relative;
    padding: 80px 20px 60px;
    text-align: center;
    background: radial-gradient(ellipse at 50% 0%, #2a2210 0%, var(--bg-dark) 70%);
    overflow: hidden;
  }
  .hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background: linear-gradient(to top, var(--bg-dark), transparent);
    pointer-events: none;
  }
  .hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
  }
  .hero h1 {
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
  }
  .hero h1 span { color: var(--gold); }
  .hero-sub {
    font-size: clamp(15px, 2vw, 18px);
    color: var(--text-sub);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }
  .btn-download {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--gold);
    color: #111;
    padding: 14px 36px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 700;
    transition: transform 0.2s, background 0.2s;
    box-shadow: 0 4px 20px rgba(245, 196, 81, 0.3);
  }
  .btn-download:hover { background: var(--gold-hover); transform: translateY(-2px); }
  .hero-stills {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 48px;
    overflow-x: auto;
    padding-bottom: 10px;
    scrollbar-width: none;
  }
  .hero-stills::-webkit-scrollbar { display: none; }
  .hero-stills img {
    height: 200px;
    width: auto;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    transition: transform 0.3s;
  }
  .hero-stills img:hover { transform: translateY(-6px) scale(1.02); }

  /* Section Shared */
  .section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }
  .section-header {
    text-align: center;
    margin-bottom: 40px;
  }
  .section-header h2 {
    font-size: clamp(24px, 3.5vw, 32px);
    font-weight: 700;
    margin-bottom: 12px;
  }
  .section-header h2 span { color: var(--gold); }
  .section-header p {
    color: var(--text-sub);
    font-size: 15px;
    max-width: 600px;
    margin: 0 auto;
  }

  /* Grid Cards */
  .grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
  }
  .card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
  }
  .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    border-color: var(--gold-dim);
  }
  .card-img-wrap {
    aspect-ratio: 3 / 4;
    overflow: hidden;
    position: relative;
  }
  .card-img-wrap img {
    width: 100%;
    height: 100%;
    transition: transform 0.3s;
  }
  .card:hover .card-img-wrap img { transform: scale(1.05); }
  .card-info {
    padding: 14px;
  }
  .card-info h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .card-info p {
    font-size: 13px;
    color: var(--text-sub);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Feature Split */
  .feature-split {
    display: flex;
    flex-direction: column;
    gap: 30px;
    align-items: center;
  }
  .feature-split.reverse { flex-direction: column-reverse; }
  .feature-img {
    flex: 1;
    width: 100%;
    border-radius: var(--radius);
    overflow: hidden;
  }
  .feature-img img {
    width: 100%;
    height: auto;
    border-radius: var(--radius);
  }
  .feature-text {
    flex: 1;
    width: 100%;
  }
  .feature-text h2 {
    font-size: 26px;
    margin-bottom: 16px;
  }
  .feature-text h2 span { color: var(--gold); }
  .feature-text p {
    color: var(--text-sub);
    font-size: 15px;
    margin-bottom: 16px;
    line-height: 1.8;
  }
  .feature-list {
    list-style: none;
    margin-top: 20px;
  }
  .feature-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    color: var(--text-main);
    font-size: 15px;
  }
  .feature-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--gold);
    font-size: 20px;
    line-height: 1.2;
  }

  /* Interaction Section */
  .interaction-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .interaction-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .interaction-card h3 {
    font-size: 18px;
    color: var(--gold);
  }
  .interaction-card p {
    font-size: 14px;
    color: var(--text-sub);
  }
  .comment-bubble {
    background: #25252e;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    color: var(--text-main);
    position: relative;
  }
  .comment-bubble::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 20px;
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #25252e;
  }
  .comment-meta {
    font-size: 12px;
    color: var(--text-sub);
    margin-bottom: 4px;
  }

  /* Download Section */
  .download-section {
    background: linear-gradient(180deg, var(--bg-dark), #1a1608);
    padding: 80px 20px;
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
  .download-section h2 {
    font-size: clamp(24px, 4vw, 36px);
    margin-bottom: 16px;
  }
  .download-section h2 span { color: var(--gold); }
  .download-section p {
    color: var(--text-sub);
    font-size: 16px;
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }
  .download-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 24px;
  }
  .download-badges span {
    font-size: 13px;
    color: var(--text-sub);
    background: var(--bg-card);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
  }

  /* Footer */
  .site-footer {
    padding: 30px 20px;
    text-align: center;
    font-size: 12px;
    color: #5a5a66;
    background: var(--bg-dark);
  }
  .site-footer p {
    margin-bottom: 8px;
  }
  .site-footer a {
    color: #5a5a66;
    transition: color 0.2s;
  }
  .site-footer a:hover { color: var(--text-sub); }
  .footer-time {
    font-size: 12px;
    color: #4a4a55;
    margin-top: 8px;
  }

  /* Animations */
  .fade-up {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .fade-up.scrolled {
    opacity: 1;
    transform: translateY(0);
  }

  /* Breakpoints */
  @media (min-width: 768px) {
    .main-nav { display: flex; }
    .header-cta { display: inline-block; }
    .hero-stills img { height: 260px; }
    .feature-split { flex-direction: row; gap: 50px; }
    .feature-split.reverse { flex-direction: row-reverse; }
    .feature-img { width: 45%; }
    .feature-text { width: 55%; }
    .interaction-grid { grid-template-columns: repeat(2, 1fr); }
  }

  @media (min-width: 1024px) {
    .hero { padding: 100px 20px 80px; }
    .hero-stills img { height: 300px; }
    .grid-cards { grid-template-columns: repeat(5, 1fr); }
    .interaction-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-split { gap: 70px; }
    .feature-text h2 { font-size: 32px; }
  }