:root {
    --bg: #fbf9f4;
    --bg-alt: #f4f0e6;
    --ink: #1f1c18;
    --ink-2: #6b665e;
    --brand: #d97706;
    --brand-soft: #fef3c7;
    --line: #e5dfd3;
  }

  * { 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);
    color: var(--ink);
    font-size: 15px;
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
  }

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

  .container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .section { margin-bottom: 104px; }

  /* 标题区通用 */
  .section-head { margin-bottom: 40px; }
  .kicker {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--ink-2);
  }
  .section-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    margin-top: 12px;
  }
  .section-desc {
    font-size: 16px;
    font-weight: 500;
    color: var(--ink-2);
    max-width: 620px;
    margin-top: 10px;
  }

  /* 01 适龄提示条 */
  .age-bar {
    background-color: var(--ink);
    color: rgba(255, 255, 255, 0.8);
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
  }

  /* 02 导航 */
  .nav-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(251, 249, 244, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
  }
  .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
  }
  .nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 18px;
  }
  .nav-brand img { height: 32px; }
  .nav-links {
    display: none;
    gap: 28px;
    font-size: 14px;
    font-weight: 500;
  }
  .nav-links a:hover { color: var(--brand); }
  .nav-cta {
    background-color: var(--ink);
    color: #fff;
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    transition: opacity 0.2s;
  }
  .nav-cta:hover { opacity: 0.8; }
  .mobile-cta { display: block; padding: 6px 14px; font-size: 13px; }

  /* 03 首屏 */
  .hero { padding-top: 60px; }
  .hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
  }
  .hero-text { display: flex; flex-direction: column; gap: 20px; }
  .hero-eyebrow {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-2);
  }
  .hero-title {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
  }
  .hero-claim {
    font-size: 20px;
    font-weight: 500;
    color: var(--ink-2);
    font-style: italic;
  }
  .hero-desc {
    font-size: 15px;
    line-height: 1.85;
    color: var(--ink-2);
    max-width: 90%;
  }
  .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
  }
  .btn-primary {
    background-color: var(--brand);
    color: #fff;
    border: 1px solid var(--brand);
  }
  .btn-primary:hover { opacity: 0.9; }
  .btn-outline {
    background-color: transparent;
    color: var(--ink);
    border: 1px solid var(--line);
  }
  .btn-outline:hover { border-color: var(--ink-2); }

  .hero-pills {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 10px;
  }
  .pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
    font-size: 13px;
    color: var(--ink-2);
    background-color: transparent;
  }

  .hero-scenes { margin-top: 10px; display: flex; flex-direction: column; gap: 20px; }
  .scene-line { font-size: 15px; color: var(--ink-2); }
  .scene-line strong { color: var(--ink); font-weight: 600; margin-right: 8px; }

  .collage {
    position: relative;
    aspect-ratio: 3/4;
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
  }
  .collage-main {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: auto;
    width: 62%;
    height: auto;
    z-index: 2;
    border: 1px solid #fff;
    box-shadow: 0 18px 40px rgba(0,0,0,.16);
    border-radius: 12px;
    object-fit: cover;
  }
  .collage-a, .collage-b { display: none; }

  .hero-footer {
    text-align: center;
    font-size: 13px;
    color: var(--ink-2);
    margin-top: 40px;
  }

  /* 04 三入口卡 */
  .grid-3 { display: grid; grid-template-columns: 1fr; gap: 20px; }
  .card {
    background-color: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 24px;
    transition: border-color 0.2s;
  }
  .card:hover { border-color: var(--brand); }
  .card-icon { margin-bottom: 16px; color: var(--brand); }
  .card-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
  .card-desc { font-size: 14px; color: var(--ink-2); margin-bottom: 16px; }
  .card-link { font-size: 14px; font-weight: 600; color: var(--brand); display: inline-flex; align-items: center; gap: 4px; }
  .card:hover .card-link span { transform: translateX(4px); }
  .card-link span { transition: transform 0.2s; }

  /* 05 为什么选我们 */
  .grid-2x2 { display: grid; grid-template-columns: 1fr; gap: 20px; }
  .feature-card {
    padding: 24px;
    background-color: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
  }
  .feature-card .card-icon { margin-bottom: 12px; }
  .feature-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
  .feature-card p { font-size: 14px; color: var(--ink-2); margin-bottom: 12px; }
  .feature-meta { font-size: 13px; color: var(--ink-2); }

  /* 06 热播 */
  .grid-hot { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .hot-card { display: flex; flex-direction: column; }
  .hot-img-wrap { position: relative; aspect-ratio: 3/4; border-radius: 12px; overflow: hidden; margin-bottom: 12px; background-color: var(--bg-alt); }
  .hot-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
  .badge-status {
    position: absolute; top: 8px; left: 8px;
    background-color: rgba(0,0,0,0.6); color: #fff;
    font-size: 11px; padding: 2px 8px; border-radius: 4px;
  }
  .hot-title { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
  .hot-genre { font-size: 13px; color: var(--ink-2); margin-bottom: 8px; }
  .tag {
    display: inline-block; font-size: 12px; padding: 2px 8px;
    border: 1px solid var(--line); border-radius: 999px; color: var(--ink-2);
  }
  .section-footer-link { display: flex; justify-content: flex-end; margin-top: 24px; }
  .text-link { font-size: 14px; font-weight: 600; color: var(--brand); }
  .text-link:hover { text-decoration: underline; }

  /* 07 排行榜 */
  .rank-list { display: flex; flex-direction: column; }
  .rank-item {
    display: flex; align-items: center; padding: 16px 0;
    border-bottom: 1px solid var(--line); gap: 16px;
  }
  .rank-num {
    font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums;
    color: var(--ink-2); width: 24px;
  }
  .rank-num.top { color: var(--brand); }
  .rank-img { width: 56px; height: 75px; border-radius: 6px; object-fit: cover; }
  .rank-info { flex: 1; min-width: 0; }
  .rank-title { font-size: 16px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .rank-meta { font-size: 13px; color: var(--ink-2); margin-top: 4px; }
  .rank-tags { display: flex; gap: 8px; margin-top: 6px; }

  /* 08 精选片单 */
  .scroll-snap { display: flex; overflow-x: auto; gap: 20px; padding-bottom: 10px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; }
  .scroll-snap::-webkit-scrollbar { display: none; }
  .playlist-card {
    flex: 0 0 62vw; scroll-snap-align: start;
    display: flex; flex-direction: column; gap: 8px;
  }
  .playlist-card img { aspect-ratio: 3/4; object-fit: cover; border-radius: 12px; width: 100%; }
  .playlist-theme { font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-2); }
  .playlist-name { font-size: 20px; font-weight: 700; }
  .playlist-desc { font-size: 14px; color: var(--ink-2); }
  .playlist-suit { font-size: 13px; color: var(--brand); margin-top: auto; }

  /* 09 制作流程 */
  .process-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
  .process-steps { display: flex; flex-direction: column; gap: 24px; }
  .step-item { display: flex; gap: 16px; align-items: flex-start; }
  .step-num {
    font-size: 28px; font-weight: 700;
    -webkit-text-stroke: 1px var(--brand); color: transparent;
    line-height: 1;
  }
  .step-content h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
  .step-content p { font-size: 14px; color: var(--ink-2); }

  /* 10 创作者 / 合作 */
  .creator-grid { display: grid; grid-template-columns: 1fr; gap: 40px; }
  .creator-text p { margin-bottom: 16px; color: var(--ink-2); }
  .creator-box { background-color: var(--bg-alt); border-radius: 18px; padding: 28px; }
  .check-list { display: flex; flex-direction: column; gap: 16px; }
  .check-item { display: flex; align-items: center; gap: 12px; font-size: 15px; }
  .check-icon { color: var(--brand); display: flex; align-items: center; justify-content: center; }

  /* 11 下载 */
  .download-section { background-color: var(--bg-alt); padding: 60px 0; border-radius: 24px; }
  .download-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: center; }
  .download-text { display: flex; flex-direction: column; gap: 20px; }
  .download-qr { background-color: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 20px; text-align: center; margin: 0 auto; max-width: 200px; }
  .qr-placeholder { width: 120px; height: 120px; margin: 0 auto 12px; background-color: var(--bg); border: 1px dashed var(--line); display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--ink-2); }
  .download-qr p { font-size: 12px; color: var(--ink-2); }

  /* 12 FAQ */
  .faq-list { border-top: 1px solid var(--line); }
  details { border-bottom: 1px solid var(--line); }
  summary {
    display: flex; align-items: center; padding: 20px 0; cursor: pointer; list-style: none;
  }
  summary::-webkit-details-marker { display: none; }
  .faq-num { font-size: 13px; color: var(--ink-2); width: 40px; flex-shrink: 0; }
  .faq-q { font-size: 17px; font-weight: 600; flex: 1; }
  .faq-icon { font-size: 20px; font-weight: 300; color: var(--ink-2); transition: transform 0.2s; }
  details[open] .faq-icon { transform: rotate(45deg); }
  .faq-a { padding-left: 40px; padding-bottom: 20px; font-size: 15px; line-height: 1.8; color: var(--ink-2); }

  /* 13 页脚 */
  .site-footer { padding: 60px 0 100px; border-top: 1px solid var(--line); background-color: var(--bg-alt); }
  .footer-top { display: flex; flex-direction: column; gap: 40px; margin-bottom: 40px; }
  .footer-brand img { height: 32px; margin-bottom: 12px; }
  .footer-brand strong { font-size: 18px; display: block; margin-bottom: 8px; }
  .footer-brand p { font-size: 14px; color: var(--ink-2); margin-bottom: 4px; }
  .footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .footer-col h4 { font-size: 14px; font-weight: 600; margin-bottom: 16px; }
  .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
  .footer-col a { font-size: 13px; color: var(--ink-2); }
  .footer-col a:hover { color: var(--brand); }
  .footer-bottom { border-top: 1px solid var(--line); padding-top: 20px; font-size: 12px; color: var(--ink-2); display: flex; flex-direction: column; gap: 8px; }

  /* 吸底条 */
  .sticky-bar {
    position: fixed; bottom: 0; left: 0; right: 0;
    background-color: rgba(251, 249, 244, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--line);
    padding: 12px 20px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    display: flex; justify-content: center; z-index: 100;
    transition: opacity 0.3s, transform 0.3s;
  }
  .sticky-bar.hidden { opacity: 0; transform: translateY(100%); pointer-events: none; }
  .sticky-bar .btn { width: 100%; max-width: 400px; }

  /* 响应式 */
  @media (min-width: 768px) {
    .hero-grid { grid-template-columns: 1.05fr 1fr; gap: 60px; }
    .nav-links { display: flex; }
    .mobile-cta { display: none; }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-2x2 { grid-template-columns: 1fr 1fr; }
    .grid-hot { grid-template-columns: repeat(3, 1fr); }
    .scroll-snap { display: grid; grid-template-columns: repeat(4, 1fr); overflow: visible; }
    .playlist-card { flex: auto; }
    .process-grid { grid-template-columns: 1fr 1fr; gap: 60px; }
    .creator-grid { grid-template-columns: 1.1fr 1fr; gap: 60px; }
    .download-grid { grid-template-columns: 1fr auto; gap: 60px; }
    .download-section { padding: 80px 60px; }
    .footer-top { flex-direction: row; justify-content: space-between; }
    .footer-links { gap: 60px; }
    .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
    .sticky-bar { display: none; }
    .site-footer { padding-bottom: 60px; }
    .collage { max-width: none; aspect-ratio: 4/5; }
    .collage-a, .collage-b { display: block; position: absolute; width: 34%; z-index: 1; border: 1px solid #fff; box-shadow: 0 18px 40px rgba(0,0,0,.16); border-radius: 12px; object-fit: cover; }
    .collage-a { top: -6%; left: 0; transform: rotate(-4deg); }
    .collage-b { bottom: -6%; right: 0; transform: rotate(4deg); z-index: 3; }
  }

  @media (min-width: 1024px) {
    .hero { padding-top: 80px; }
    .collage-main { width: 62%; }
  }