:root {
    --bg-deep: #0d0d14;
    --bg-card: #161622;
    --bg-elevated: #1e1e30;
    --accent: #ff3b5c;
    --accent-glow: rgba(255, 59, 92, 0.35);
    --accent-2: #8b5cf6;
    --text-main: #f0f0f5;
    --text-sub: #a0a0b8;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 16px;
  }

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

  body {
    background: var(--bg-deep);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
  }

  a { color: inherit; text-decoration: none; }
  img { display: block; max-width: 100%; }
  ul { list-style: none; }

  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  /* Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 13, 20, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.5px;
  }

  .brand img {
    height: 34px;
    width: auto;
    border-radius: 8px;
  }

  .nav-links {
    display: none;
    gap: 24px;
    font-size: 14px;
    color: var(--text-sub);
  }

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

  .header-cta {
    display: none;
    background: var(--accent);
    color: #fff;
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 0 16px var(--accent-glow);
  }

  /* Hero */
  .hero {
    position: relative;
    padding: 60px 0 50px;
    background:
      radial-gradient(ellipse at 20% 0%, rgba(139, 92, 246, 0.18), transparent 55%),
      radial-gradient(ellipse at 85% 20%, rgba(255, 59, 92, 0.18), transparent 50%);
    overflow: hidden;
  }

  .hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 44px 44px;
    pointer-events: none;
  }

  .hero-inner {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 40px;
  }

  .hero-text { max-width: 640px; }

  .hero-badge {
    display: inline-block;
    font-size: 13px;
    color: #ffb3c1;
    background: rgba(255, 59, 92, 0.12);
    border: 1px solid rgba(255, 59, 92, 0.3);
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 18px;
  }

  h1 {
    font-size: 32px;
    line-height: 1.3;
    font-weight: 800;
    margin-bottom: 18px;
    background: linear-gradient(135deg, #fff 30%, #ff8fa3 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-desc {
    color: var(--text-sub);
    font-size: 15px;
    margin-bottom: 28px;
    max-width: 520px;
  }

  .download-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }

  .btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 15px;
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .btn-download:active { transform: scale(0.97); }

  .btn-primary {
    background: linear-gradient(135deg, #ff3b5c, #ff6b35);
    color: #fff;
    box-shadow: 0 6px 24px var(--accent-glow);
  }

  .btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-main);
    border: 1px solid var(--border);
  }

  .btn-secondary:hover { border-color: var(--accent-2); }

  .btn-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
  }

  .hero-poster {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.6);
    border: 1px solid var(--border);
    align-self: center;
    width: 100%;
    max-width: 320px;
  }

  .hero-poster img { width: 100%; height: auto; }

  /* Section Base */
  section { padding: 60px 0; }

  .section-head {
    text-align: center;
    margin-bottom: 40px;
  }

  .section-head h2 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 10px;
  }

  .section-head p {
    color: var(--text-sub);
    font-size: 14px;
  }

  .section-head .tag {
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    display: block;
    margin-bottom: 8px;
  }

  /* AI Section */
  .ai-section {
    background: linear-gradient(180deg, var(--bg-deep), #0a0a12);
  }

  .ai-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .ai-card-media {
    position: relative;
    aspect-ratio: 3 / 4;
    overflow: hidden;
  }

  .ai-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
  }

  .ai-card:hover .ai-card-media img { transform: scale(1.05); }

  .ai-card-body {
    padding: 16px;
  }

  .ai-card-body h3 {
    font-size: 17px;
    margin-bottom: 8px;
    font-weight: 700;
  }

  .ai-card-body p {
    font-size: 13px;
    color: var(--text-sub);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    font-size: 12px;
  }

  .tag-chip {
    background: rgba(139, 92, 246, 0.15);
    color: #c4b5fd;
    padding: 3px 10px;
    border-radius: 20px;
  }

  .score {
    color: #fbbf24;
    font-weight: 700;
  }

  .upload-time {
    color: var(--text-sub);
    margin-left: auto;
    font-size: 12px;
  }

  /* Hot Section */
  .hot-section { background: var(--bg-card); }

  .hot-wall {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .poster-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 3 / 4;
    border: 1px solid var(--border);
  }

  .poster-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .poster-item .poster-info {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 30px 12px 12px;
    background: linear-gradient(transparent, rgba(0,0,0,0.9));
  }

  .poster-item .poster-info strong {
    display: block;
    font-size: 14px;
    margin-bottom: 4px;
  }

  .poster-item .poster-info span {
    font-size: 11px;
    color: #ccc;
  }

  .poster-item .poster-score {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0,0,0,0.65);
    color: #fbbf24;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
  }

  /* Steps */
  .steps-section { background: var(--bg-deep); }

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

  .step-card {
    display: flex;
    gap: 16px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border);
    transition: border-color 0.2s;
  }

  .step-card:hover { border-color: var(--accent-2); }

  .step-num {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 16px;
  }

  .step-card h3 {
    font-size: 15px;
    margin-bottom: 4px;
  }

  .step-card p {
    font-size: 13px;
    color: var(--text-sub);
  }

  /* FAQ */
  .faq-section { background: var(--bg-card); }

  .faq-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .faq-item {
    background: var(--bg-elevated);
    border-radius: 12px;
    padding: 18px 20px;
    border-left: 3px solid var(--accent);
  }

  .faq-item h3 {
    font-size: 15px;
    margin-bottom: 6px;
    color: #fff;
  }

  .faq-item p {
    font-size: 13px;
    color: var(--text-sub);
  }

  /* Reviews */
  .reviews-section { background: var(--bg-deep); }

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

  .review-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border);
    position: relative;
  }

  .review-card::before {
    content: "“";
    position: absolute;
    top: 10px;
    right: 18px;
    font-size: 48px;
    color: rgba(255, 59, 92, 0.18);
    font-family: serif;
    line-height: 1;
  }

  .review-card p {
    font-size: 14px;
    color: #d0d0e0;
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
  }

  .review-user {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-2), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
  }

  .review-user span { font-size: 13px; color: var(--text-sub); }

  /* Privacy */
  .privacy-section {
    background: linear-gradient(180deg, #0a0a12, var(--bg-deep));
  }

  .privacy-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .privacy-item {
    display: flex;
    gap: 14px;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 18px;
    border: 1px solid var(--border);
  }

  .privacy-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(255, 59, 92, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 18px;
  }

  .privacy-item h3 { font-size: 15px; margin-bottom: 4px; }
  .privacy-item p { font-size: 13px; color: var(--text-sub); }

  /* Creator & Community */
  .creator-section { background: var(--bg-card); }

  .creator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .creator-box {
    background: var(--bg-elevated);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
  }

  .creator-box h3 {
    font-size: 18px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .creator-box h3::before {
    content: "";
    width: 4px;
    height: 18px;
    background: var(--accent);
    border-radius: 2px;
  }

  .creator-list li {
    font-size: 14px;
    color: var(--text-sub);
    padding: 10px 0;
    border-bottom: 1px dashed var(--border);
    display: flex;
    gap: 8px;
  }

  .creator-list li:last-child { border-bottom: none; }

  .creator-list li::before {
    content: "✦";
    color: var(--accent-2);
    flex-shrink: 0;
  }

  .community-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
  }

  .community-chip {
    background: var(--bg-deep);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 13px;
    color: var(--text-sub);
  }

  /* Download Final */
  .download-section {
    background:
      radial-gradient(ellipse at 50% 0%, rgba(255, 59, 92, 0.14), transparent 60%),
      var(--bg-deep);
    text-align: center;
  }

  .download-section h2 { font-size: 26px; margin-bottom: 12px; }

  .download-section > .container > p {
    color: var(--text-sub);
    font-size: 14px;
    max-width: 560px;
    margin: 0 auto 28px;
  }

  .install-tips {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    max-width: 800px;
    margin: 0 auto 32px;
    text-align: left;
  }

  .install-tip {
    display: flex;
    gap: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 13px;
    color: var(--text-sub);
  }

  .install-tip strong { color: var(--text-main); font-size: 14px; }

  .final-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }

  /* Footer */
  .site-footer {
    border-top: 1px solid var(--border);
    padding: 28px 0;
    text-align: center;
  }

  .site-footer p {
    font-size: 12px;
    color: #66667a;
    margin-bottom: 6px;
  }

  .site-footer a {
    color: #66667a;
    font-size: 12px;
  }

  .site-footer a:hover { color: var(--text-sub); }

  .update-time {
    display: block;
    font-size: 12px;
    color: #55556a;
    margin-top: 6px;
  }

  /* Responsive */
  @media (min-width: 768px) {
    .nav-links, .header-cta { display: flex; }
    .header-cta { display: inline-block; }
    h1 { font-size: 44px; }
    .hero { padding: 80px 0 70px; }
    .hero-inner { flex-direction: row; align-items: center; justify-content: space-between; }
    .hero-poster { max-width: 340px; flex-shrink: 0; }
    .ai-grid { grid-template-columns: repeat(2, 1fr); }
    .hot-wall { grid-template-columns: repeat(3, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-list { grid-template-columns: repeat(2, 1fr); }
    .review-grid { grid-template-columns: repeat(2, 1fr); }
    .privacy-grid { grid-template-columns: repeat(2, 1fr); }
    .creator-layout { grid-template-columns: 1fr 1fr; }
    .install-tips { grid-template-columns: repeat(2, 1fr); }
    section { padding: 80px 0; }
  }

  @media (min-width: 1024px) {
    .ai-grid { grid-template-columns: repeat(4, 1fr); }
    .hot-wall { grid-template-columns: repeat(5, 1fr); }
    .steps-grid { grid-template-columns: repeat(3, 1fr); }
    .review-grid { grid-template-columns: repeat(3, 1fr); }
    .privacy-grid { grid-template-columns: repeat(3, 1fr); }
    .install-tips { grid-template-columns: repeat(4, 1fr); }
    h1 { font-size: 48px; }
  }