:root {
    --bg-dark: #0a0a0f;
    --bg-card: #161620;
    --bg-card-hover: #1e1e2d;
    --primary: #7c3aed;
    --primary-light: #a78bfa;
    --accent: #f43f5e;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #2d2d3d;
    --gradient-1: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
    --gradient-2: linear-gradient(135deg, #1e1b4b 0%, #0a0a0f 100%);
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
  }
  a { text-decoration: none; color: inherit; }
  ul { list-style: none; }
  .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
  
  /* Header */
  .site-header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    background: rgba(10, 10, 15, 0.8); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
  }
  .header-inner { display: flex; justify-content: space-between; align-items: center; height: 64px; }
  .logo-group { display: flex; align-items: center; gap: 10px; }
  .logo-group img { height: 34px; border-radius: 8px; }
  .logo-group span { font-size: 1.2rem; font-weight: 800; letter-spacing: 1px; }
  .nav-links { display: none; gap: 24px; font-size: 0.95rem; color: var(--text-muted); }
  .nav-links a:hover { color: var(--primary-light); }
  .header-download { display: none; background: var(--gradient-1); padding: 8px 20px; border-radius: 20px; font-weight: 600; font-size: 0.9rem; }

  /* Hero Section */
  .hero {
    padding: 120px 0 60px;
    background: radial-gradient(circle at top right, rgba(124, 58, 237, 0.15) 0%, transparent 60%),
                radial-gradient(circle at bottom left, rgba(244, 63, 94, 0.1) 0%, transparent 50%);
    position: relative;
  }
  .hero-content { display: flex; flex-direction: column; gap: 40px; align-items: center; text-align: center; }
  .hero-text h1 {
    font-size: 2.2rem; line-height: 1.3; margin-bottom: 16px;
    background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  }
  .hero-text p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto 24px; }
  .hero-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 30px; }
  .hero-badges span { background: rgba(124, 58, 237, 0.2); border: 1px solid rgba(124, 58, 237, 0.4); padding: 4px 12px; border-radius: 20px; font-size: 0.85rem; color: var(--primary-light); }
  .hero-downloads { display: flex; flex-direction: column; gap: 16px; width: 100%; max-width: 460px; margin: 0 auto; }
  .btn {
    display: flex; justify-content: center; align-items: center; gap: 8px; padding: 14px 24px; border-radius: 12px; font-weight: 600; font-size: 1.05rem; transition: transform 0.2s, box-shadow 0.2s;
  }
  .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3); }
  .btn-primary { background: var(--gradient-1); color: #fff; box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4); }
  .btn-secondary { background: rgba(255, 255, 255, 0.05); border: 1px solid var(--border-color); color: var(--text-main); }
  .hero-img-wrap { position: relative; width: 100%; max-width: 380px; margin: 0 auto; }
  .hero-img-wrap img { width: 100%; border-radius: 16px; box-shadow: 0 20px 40px rgba(0,0,0,0.5); }

  /* Section Common */
  section { padding: 80px 0; }
  .section-title { text-align: center; margin-bottom: 48px; }
  .section-title h2 { font-size: 1.8rem; margin-bottom: 12px; }
  .section-title p { color: var(--text-muted); font-size: 0.95rem; }

  /* AI Section */
  .ai-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
  .card { background: var(--bg-card); border-radius: 16px; overflow: hidden; border: 1px solid var(--border-color); transition: background 0.3s; }
  .card:hover { background: var(--bg-card-hover); }
  .card-img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
  .card-body { padding: 16px; }
  .card-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
  .card-body p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
  .tag { font-size: 0.75rem; background: rgba(167, 139, 250, 0.15); color: var(--primary-light); padding: 2px 8px; border-radius: 4px; }
  .meta { display: flex; justify-content: space-between; font-size: 0.8rem; color: #64748b; }

  /* Steps Section */
  .steps-wrap { display: flex; flex-direction: column; gap: 24px; }
  .step-item { display: flex; gap: 16px; align-items: flex-start; background: var(--bg-card); padding: 20px; border-radius: 12px; border: 1px solid var(--border-color); }
  .step-num { font-size: 1.5rem; font-weight: 800; color: var(--primary); line-height: 1; min-width: 40px; }
  .step-text h3 { font-size: 1.05rem; margin-bottom: 6px; }
  .step-text p { font-size: 0.9rem; color: var(--text-muted); }

  /* FAQ Section */
  .faq-list { display: flex; flex-direction: column; gap: 16px; }
  .faq-item { background: var(--bg-card); border-radius: 12px; border: 1px solid var(--border-color); padding: 20px; }
  .faq-q { font-weight: 600; color: var(--primary-light); margin-bottom: 8px; display: flex; gap: 8px; }
  .faq-q::before { content: "Q"; font-size: 0.9rem; background: rgba(124, 58, 237, 0.2); padding: 2px 6px; border-radius: 4px; }
  .faq-a { font-size: 0.9rem; color: var(--text-muted); display: flex; gap: 8px; }
  .faq-a::before { content: "A"; font-size: 0.9rem; background: rgba(100, 116, 139, 0.2); padding: 2px 6px; border-radius: 4px; }

  /* Reviews Section */
  .reviews-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
  .review-card { background: var(--bg-card); padding: 20px; border-radius: 12px; border: 1px solid var(--border-color); }
  .review-user { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
  .avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--gradient-1); display: flex; justify-content: center; align-items: center; font-weight: bold; font-size: 0.9rem; }
  .user-info h4 { font-size: 0.9rem; margin-bottom: 2px; }
  .user-info span { font-size: 0.75rem; color: var(--text-muted); }
  .review-text { font-size: 0.9rem; color: #cbd5e1; line-height: 1.5; }

  /* Community & Creator */
  .split-section { display: flex; flex-direction: column; gap: 24px; }
  .info-box { background: var(--bg-card); padding: 24px; border-radius: 16px; border: 1px solid var(--border-color); }
  .info-box h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--primary-light); }
  .info-box p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 16px; }
  .info-list { display: flex; flex-direction: column; gap: 12px; }
  .info-list li { font-size: 0.9rem; color: #cbd5e1; display: flex; gap: 8px; }
  .info-list li::before { content: "•"; color: var(--accent); font-weight: bold; }

  /* Footer */
  .site-footer { background: #050508; padding: 40px 0 30px; text-align: center; border-top: 1px solid var(--border-color); font-size: 0.85rem; color: #64748b; }
  .site-footer p { margin-bottom: 8px; }
  .site-footer a { color: #64748b; }
  .site-footer a:hover { color: var(--text-muted); }

  /* Responsive */
  @media (min-width: 768px) {
    .nav-links { display: flex; }
    .header-download { display: block; }
    .hero { padding: 140px 0 80px; }
    .hero-content { flex-direction: row; text-align: left; justify-content: space-between; }
    .hero-text { flex: 1; max-width: 500px; }
    .hero-text h1 { font-size: 2.8rem; }
    .hero-text p { margin: 0 0 24px; }
    .hero-badges { justify-content: flex-start; }
    .hero-downloads { flex-direction: row; justify-content: flex-start; max-width: none; }
    .hero-img-wrap { flex: 1; max-width: 320px; margin: 0; }
    .ai-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-wrap { flex-direction: row; flex-wrap: wrap; }
    .step-item { flex: 1; min-width: calc(50% - 12px); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .split-section { flex-direction: row; }
    .info-box { flex: 1; }
  }

  @media (min-width: 1024px) {
    .hero-text h1 { font-size: 3.2rem; }
    .hero-img-wrap { max-width: 380px; }
    .ai-grid { grid-template-columns: repeat(3, 1fr); }
    .step-item { min-width: calc(25% - 18px); }
    .reviews-grid { grid-template-columns: repeat(3, 1fr); }
  }