:root {
    --bg: #121212;
    --bg-soft: #1c1c1e;
    --card: #242426;
    --text: #f5f5f7;
    --text-muted: #a1a1a6;
    --accent: #f5c518;
    --accent-dark: #e0b100;
    --radius: 12px;
    --radius-lg: 20px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  a { color: var(--accent); text-decoration: none; }
  img { display: block; max-width: 100%; }
  .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

  /* Header */
  .site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(18,18,18,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
  }
  .brand-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--text); }
  .brand-logo img { height: 32px; width: auto; border-radius: 6px; }
  .nav-links { display: none; gap: 28px; font-size: 15px; color: var(--text-muted); }
  .nav-links a:hover { color: var(--accent); }
  .header-cta {
    display: none; background: var(--accent); color: #111;
    padding: 8px 20px; border-radius: 999px; font-weight: 700; font-size: 14px;
    transition: background 0.2s;
  }
  .header-cta:hover { background: var(--accent-dark); }

  /* Hero */
  .hero {
    padding: 60px 0 40px;
    background: radial-gradient(circle at 80% 20%, rgba(245,197,24,0.1) 0%, transparent 40%),
                radial-gradient(circle at 10% 80%, rgba(245,197,24,0.05) 0%, transparent 40%);
    overflow: hidden;
  }
  .hero-inner { display: flex; flex-direction: column; gap: 40px; }
  .hero-text h1 { font-size: 32px; line-height: 1.3; margin-bottom: 16px; letter-spacing: -0.5px; }
  .hero-text h1 span { color: var(--accent); }
  .hero-text p { color: var(--text-muted); font-size: 16px; margin-bottom: 28px; max-width: 500px; }
  .btn-primary {
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--accent); color: #111;
    padding: 14px 36px; border-radius: 999px;
    font-size: 16px; font-weight: 700;
    transition: transform 0.2s, background 0.2s;
  }
  .btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
  .hero-image { position: relative; width: 100%; border-radius: var(--radius-lg); overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,0.5); }
  .hero-image img { width: 100%; height: auto; object-fit: cover; aspect-ratio: 3/4; }
  .hero-tag {
    position: absolute; bottom: 16px; left: 16px;
    background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
    padding: 6px 14px; border-radius: 999px; font-size: 13px; color: #fff;
    border: 1px solid rgba(255,255,255,0.1);
  }

  /* Section common */
  section { padding: 60px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 24px; margin-bottom: 8px; }
  .section-head p { color: var(--text-muted); font-size: 15px; }

  /* Latest */
  .grid-scroll { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .card { background: var(--card); border-radius: var(--radius); overflow: hidden; transition: transform 0.3s; }
  .card:hover { transform: translateY(-4px); }
  .card-img { position: relative; width: 100%; aspect-ratio: 3/4; overflow: hidden; }
  .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
  .card:hover .card-img img { transform: scale(1.05); }
  .card-info { padding: 12px; }
  .card-info h3 { font-size: 15px; font-weight: 600; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .card-info p { font-size: 12px; color: var(--text-muted); }

  /* Collection / topics */
  .collection-list { display: flex; flex-direction: column; gap: 20px; }
  .collection-item {
    display: flex; gap: 16px; background: var(--bg-soft);
    padding: 16px; border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.04);
  }
  .collection-item img { width: 100px; height: 133px; object-fit: cover; border-radius: 8px; flex-shrink: 0; }
  .collection-text h3 { font-size: 18px; margin-bottom: 6px; }
  .collection-text p { font-size: 14px; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

  /* Features */
  .features-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
  .feature-box { background: var(--card); padding: 24px; border-radius: var(--radius); }
  .feature-box h3 { font-size: 18px; margin-bottom: 8px; color: var(--accent); }
  .feature-box p { font-size: 14px; color: var(--text-muted); }

  /* Guide / steps */
  .step-list { display: flex; flex-direction: column; gap: 24px; }
  .step-item { display: flex; gap: 16px; }
  .step-num {
    width: 32px; height: 32px; flex-shrink: 0;
    background: rgba(245,197,24,0.15); color: var(--accent);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 16px;
  }
  .step-content h3 { font-size: 17px; margin-bottom: 4px; }
  .step-content p { font-size: 14px; color: var(--text-muted); }

  /* Wall */
  .wall-scroll {
    display: flex; gap: 16px; overflow-x: auto; padding-bottom: 16px;
    scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch;
  }
  .wall-scroll::-webkit-scrollbar { height: 6px; }
  .wall-scroll::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }
  .wall-item { flex: 0 0 160px; scroll-snap-align: start; }
  .wall-item img { width: 100%; aspect-ratio: 3/4; object-fit: cover; border-radius: 10px; }

  /* FAQ */
  .faq-list { display: flex; flex-direction: column; gap: 16px; }
  .faq-item { background: var(--bg-soft); border-radius: var(--radius); padding: 20px; }
  .faq-item h3 { font-size: 16px; margin-bottom: 8px; }
  .faq-item h3::before { content: "Q "; color: var(--accent); font-weight: 800; }
  .faq-item p { font-size: 14px; color: var(--text-muted); }

  /* Auth */
  .auth-box {
    background: linear-gradient(135deg, rgba(245,197,24,0.1), rgba(245,197,24,0.02));
    border: 1px solid rgba(245,197,24,0.3);
    border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
  }
  .auth-box h2 { font-size: 22px; margin-bottom: 12px; color: var(--accent); }
  .auth-box p { font-size: 15px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

  /* Download */
  .download-sec {
    text-align: center; background: var(--bg-soft);
    border-radius: var(--radius-lg); padding: 48px 24px; margin: 40px 0;
  }
  .download-sec h2 { font-size: 26px; margin-bottom: 12px; }
  .download-sec p { color: var(--text-muted); margin-bottom: 28px; font-size: 15px; }

  /* Footer */
  .site-footer {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 32px 0; font-size: 13px; color: #666;
    text-align: center;
  }
  .site-footer p { margin-bottom: 8px; }
  .site-footer a { color: #888; }
  .site-footer a:hover { color: var(--text-muted); }

  @media (min-width: 768px) {
    .hero-text h1 { font-size: 44px; }
    .hero-text p { font-size: 18px; }
    .hero-inner { flex-direction: row; align-items: center; gap: 60px; }
    .hero-text { flex: 1; }
    .hero-image { flex: 0 0 360px; }
    .nav-links { display: flex; }
    .grid-scroll { grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .collection-list { flex-direction: row; flex-wrap: wrap; }
    .collection-item { width: calc(50% - 10px); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .wall-item { flex: 0 0 220px; }
    section { padding: 80px 0; }
    .section-head h2 { font-size: 32px; }
  }

  @media (min-width: 1024px) {
    .header-cta { display: inline-flex; }
    .header-inner { height: 76px; }
    .hero { padding: 80px 0 60px; }
    .hero-text h1 { font-size: 52px; }
    .grid-scroll { grid-template-columns: repeat(5, 1fr); }
    .collection-item { width: calc(33.333% - 14px); }
    .features-grid { grid-template-columns: repeat(4, 1fr); }
    .step-list { flex-direction: row; gap: 32px; }
    .step-item { flex: 1; flex-direction: column; gap: 12px; }
    .wall-item { flex: 0 0 240px; }
    .split-layout { display: flex; align-items: center; gap: 60px; }
    .split-layout > * { flex: 1; }
  }