/* ============================================================
     茶好了 · 大地作品 · 海报单页 v1

     定位：s.chahaole.com
     目的：视觉驱动的内容页，回答主站 V·邀请的问题

     结构：
     1. 首屏 · 全屏茶汤图（品牌名叠加，底部渐变承托文字）
     2. 视频 · 注水显形循环短片
     3. 产品特点 · 三段图文
     4. 页脚 · 备案 + 版权

     技术：
     · 无 JS
     · 字体栈与主站一致（--font-serif / --font-sans）
     · 墨色层级与主站一致（--ink 100% / 82% / 68% / 62%）
     · 图片视频走 v.chahaole.com（CDN）
     ============================================================ */
  :root {
    --ink-hue: 26, 20, 16;

    --ink:   rgba(var(--ink-hue), 1);
    --ink-2: rgba(var(--ink-hue), 0.82);
    --ink-3: rgba(var(--ink-hue), 0.68);
    --ink-4: rgba(var(--ink-hue), 0.62);

    --amber:      #A85812;
    --amber-soft: rgba(168, 88, 18, 0.18);
    --amber-light:#D99A55;

    --paper:      #F4EFE6;
    --line:       rgba(var(--ink-hue), 0.15);
    --line-soft:  rgba(var(--ink-hue), 0.08);

    --serif: "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
    --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI",
             "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
             "Helvetica Neue", Helvetica, Arial, sans-serif;

    --gutter: 2.5rem;
    --page:   76rem;

    /* 媒体资源域名 · CDN */
    --media: https://v.chahaole.com;
  }

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

  html {
    font-size: 100%;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
  }

  body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.85;
    font-weight: 400;
    letter-spacing: 0.01em;
    overflow-x: hidden;
  }

  .page {
    width: 100%;
    max-width: var(--page);
    margin: 0 auto;
    padding-inline: var(--gutter);
  }

  /* ============================================================
     第一屏 · 全屏茶汤图
     ============================================================ */
  .poster {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
    background: #1A1008;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }

  /* 背景图 · 后期替换为茶汤特写 */
  .poster-media {
    position: absolute;
    inset: 0;
    background-image: url("https://v.chahaole.com/images/tea-hero-1600.webp");
    background-size: cover;
    background-position: center;
    /* 无图时的底色 */
    background-color: #2E1E12;
  }

  /* 底部深色渐变 · 承托文字 */
  .poster-media::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
      180deg,
      rgba(10, 8, 5, 0.35) 0%,
      rgba(10, 8, 5, 0) 30%,
      rgba(10, 8, 5, 0) 55%,
      rgba(10, 8, 5, 0.75) 100%
    );
  }

  /* 顶部标记 */
  .poster-top {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 3rem var(--gutter) 0;
    max-width: var(--page);
    margin: 0 auto;
    width: 100%;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: rgba(244, 239, 230, 0.8);
  }

  /* 底部文字 · 品牌名 + 宣言 */
  .poster-bottom {
    position: relative;
    z-index: 2;
    padding: 0 var(--gutter) 3rem;
    max-width: var(--page);
    margin: 0 auto;
    width: 100%;
  }

  .poster-brand {
    font-family: var(--serif);
    font-size: clamp(1.75rem, 4vw, 3rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: #F4EFE6;
    margin-bottom: 0.75rem;
  }

  .poster-brand em {
    font-style: normal;
    color: var(--amber-light);
    font-weight: 400;
  }

  .poster-tagline {
    font-family: var(--serif);
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    font-weight: 300;
    line-height: 1.5;
    letter-spacing: 0.02em;
    color: rgba(244, 239, 230, 0.85);
    max-width: 30em;
  }

  /* 向下滚动暗示 */
  .poster-scroll {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(244, 239, 230, 0.4);
    z-index: 2;
  }

  /* ============================================================
     视频 · 注水显形
     ============================================================ */
  .film {
    background: var(--paper);
    padding-block: 10rem;
  }

  .film-video {
    width: 100%;
    max-width: 60rem;
    margin: 0 auto;
    display: block;
    aspect-ratio: 16 / 9;
    background: #0A0805;
    object-fit: cover;
  }

  .film-caption {
    max-width: 44rem;
    margin: 2.5rem auto 0;
    padding-inline: var(--gutter);
    font-family: var(--serif);
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    font-weight: 400;
    line-height: 1.6;
    color: var(--ink-2);
  }

  /* ============================================================
     产品特点 · 三段图文
     ============================================================ */
  .notes {
    background: var(--paper);
    padding-block: 4rem 12rem;
  }

  .note {
    max-width: 60rem;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
    padding-block: 6rem;
  }

  .note + .note {
    border-top: 1px solid var(--line-soft);
  }

  /* 偶数项 · 图文位置互换 */
  .note:nth-child(even) .note-media {
    order: 2;
  }

  .note:nth-child(even) .note-text {
    order: 1;
  }

  .note-media {
    aspect-ratio: 4 / 5;
    overflow: hidden;
    background: #EDE6DA;
  }

  .note-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }

  .note-text {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .note-num {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--amber);
  }

  .note-title {
    font-family: var(--serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 400;
    line-height: 1.3;
    letter-spacing: -0.015em;
    color: var(--ink);
  }

  .note-body {
    font-size: 15px;
    line-height: 1.9;
    color: var(--ink-2);
    max-width: 28em;
  }

  /* ============================================================
     页脚 · 精简版
     ============================================================ */
  .colophon {
    padding-top: 4rem;
    padding-bottom: 5rem;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .colophon-row {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem 2rem;
  }

  .colophon a,
  .colophon span {
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0.12em;
    color: var(--ink-3);
    line-height: 1.6;
    text-decoration: none;
    display: inline-block;
  }

  .colophon a {
    border-bottom: 1px solid transparent;
    transition: color 0.2s ease, border-bottom-color 0.2s ease;
  }

  .colophon a:hover,
  .colophon a:focus-visible {
    color: var(--ink-2);
    border-bottom-color: var(--line);
    outline: none;
  }

  /* ============================================================
     断点 · 平板 768–1023px
     ============================================================ */
  @media (max-width: 1023px) {
    :root {
      --gutter: 2rem;
    }

    .poster-top {
      padding-top: 2.5rem;
    }

    .poster-bottom {
      padding-bottom: 2.5rem;
    }

    .film {
      padding-block: 7rem;
    }

    .notes {
      padding-block: 2rem 8rem;
    }

    .note {
      gap: 3rem;
      padding-block: 4rem;
    }
  }

  /* ============================================================
     断点 · 大手机 480–767px
     ============================================================ */
  @media (max-width: 767px) {
    :root {
      --gutter: 1.5rem;
    }

    .poster {
      height: 100vh;
      min-height: 480px;
    }

    .poster-top {
      padding-top: 2rem;
    }

    .poster-bottom {
      padding-bottom: 2rem;
    }

    .film {
      padding-block: 5rem;
    }

    .film-caption {
      margin-top: 1.75rem;
    }

    .notes {
      padding-block: 1rem 6rem;
    }

    .note {
      grid-template-columns: 1fr;
      gap: 2rem;
      padding-block: 3.5rem;
    }

    /* 移动端取消图文互换 · 全部图在上文在下 */
    .note:nth-child(even) .note-media,
    .note:nth-child(even) .note-text {
      order: initial;
    }

    .note-media {
      aspect-ratio: 4 / 3;
    }
  }

  /* ============================================================
     断点 · 小手机 < 480px
     ============================================================ */
  @media (max-width: 479px) {
    :root {
      --gutter: 1.25rem;
    }

    .poster-brand {
      font-size: clamp(1.5rem, 7vw, 2rem);
    }

    .poster-tagline {
      font-size: 13px;
    }

    .film {
      padding-block: 4rem;
    }

    .notes {
      padding-block: 0.5rem 5rem;
    }

    .note {
      padding-block: 3rem;
    }

    .colophon-row {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.5rem;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; }
  }

  @media print {
    .poster {
      height: auto;
      min-height: auto;
    }
  }