:root {
      --ink: #111;
      --mute: #5c5c5c;
      --dim: #8d8d8d;
      --line: rgba(17,17,17,.1);
      --font: "Geist", "PingFang SC", "Hiragino Sans GB", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body { background: #fff; }
    body {
      color: var(--ink);
      font-family: var(--font);
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

    .bar {
      display: flex; align-items: center;
      height: 72px; padding: 0 40px;
      max-width: 1180px; margin: 0 auto;
    }
    .brand {
      display: flex; align-items: center; gap: 12px;
      font-size: 27px; font-weight: 500; letter-spacing: -.03em;
    }
    .brand .seal {
      display: flex; flex-direction: column; align-items: center;
      gap: 5px; flex: none;
    }
    /* 英文下 cname 置空，整块 seal 同步收掉，避免标上浮 */
    .brand .seal:has(.cname:empty) { gap: 0; }
    .brand .cname {
      font-size: 11px; font-weight: 400; color: #9a9a9a;
      letter-spacing: .18em; text-indent: .18em; line-height: 1;
    }
    .brand .qmark { width: 32px; height: 32px; border-radius: 8px; }
    .brand .qmark .tail { stroke-dasharray: 4.4; stroke-dashoffset: 4.4; }
    .brand .qmark .spark { fill: #fff; opacity: 0; }
    /* D3 动效：图标缩放 → 尾巴画出 → 渠桥/bridge 入画 → 光点滑出 */
    .brand .qmark { animation: brand-icon .6s cubic-bezier(.16,1,.3,1) both; }
    @keyframes brand-icon { from { opacity: 0; transform: scale(.8); } to { opacity: 1; transform: none; } }
    .brand .qmark .tail { animation: brand-tail 1s cubic-bezier(.22,.61,.36,1) .35s both; }
    @keyframes brand-tail { to { stroke-dashoffset: 0; } }
    .brand .cname { animation: brand-cn .5s cubic-bezier(.22,.61,.36,1) .5s both; }
    @keyframes brand-cn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
    .brand > [data-i18n="title"] { animation: brand-en .7s cubic-bezier(.16,1,.3,1) .5s both; }
    @keyframes brand-en { from { opacity: 0; transform: translateX(-9px); } to { opacity: 1; transform: none; } }
    .brand .qmark .spark { animation: brand-spark 2.8s ease-out 1.6s infinite; }
    @keyframes brand-spark {
      0%, 50% { opacity: 0; transform: translateX(0); }
      60% { opacity: 1; }
      86% { opacity: 1; transform: translateX(11px); }
      100% { opacity: 0; transform: translateX(15px); }
    }
    .bar-right { margin-left: auto; display: flex; align-items: center; gap: 18px; }
    .lang { display: flex; gap: 10px; font-size: 12px; color: var(--dim); }
    .lang button { min-width: 28px; min-height: 32px; }
    .lang button.on { color: var(--ink); }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      height: 36px; padding: 0 16px; border-radius: 999px;
      background: #111; color: #fff; font-size: 13px; font-weight: 500;
    }
    .btn:hover { background: #2a2a2a; }
    .btn.lg { height: 52px; padding: 0 22px 0 24px; font-size: 16px; gap: 10px; }
    .btn.lg { gap: 8px; }
    .btn .as {
      font-size: 12px; font-weight: 500;
      padding: 4px 9px; border-radius: 999px;
      background: rgba(255,255,255,.16);
      letter-spacing: 0;
    }


    .page { max-width: 1180px; margin: 0 auto; padding: 56px 40px 96px; }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(280px, 1fr) minmax(300px, 1.2fr);
      gap: 40px;
      align-items: stretch;
    }
    .hero-grid h1 { max-width: none; }
    .copy {
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .gallery {
      display: flex;
      flex-direction: column;
      min-height: 100%;
    }
    .shots {
      flex: 1 1 auto;
      min-height: 0;
      overflow: hidden;
      background: transparent;
      container-type: inline-size;
      touch-action: none;
      cursor: grab;
    }
    .shots:active { cursor: grabbing; }
    .track {
      display: flex;
      height: 100%;
      width: max-content;
      transition: transform .45s cubic-bezier(.22,.61,.36,1);
    }
    .track figure {
      position: relative;
      flex: 0 0 100cqi;
      width: 100cqi;
      max-width: 100cqi;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      height: 100%;
      margin: 0;
      padding: 18px 22px 14px;
    }
    .dots {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 8px;
      padding: 2px 0 0;
    }
    .dots button {
      width: 7px;
      height: 7px;
      padding: 0;
      border: 0;
      border-radius: 50%;
      background: #d4d4d4;
      cursor: pointer;
    }
    .dots button.on {
      background: #111;
    }
    .track img {
      flex: 1 1 auto;
      min-height: 0;
      width: 100%;
      height: auto;
      object-fit: contain;
      object-position: center bottom;
      border-radius: 12px;
      display: block;
      background: #fff;
      box-shadow:
        0 0 0 1px rgba(0,0,0,.06),
        0 1px 2px rgba(0,0,0,.04),
        0 8px 20px rgba(0,0,0,.08);
      user-select: none;
      -webkit-user-drag: none;
      pointer-events: none;
    }
    .track figcaption {
      flex: none;
      text-align: center;
      padding: 8px 16px 0;
      font-size: 13px;
      font-weight: 600;
      letter-spacing: .02em;
      color: var(--mute);
      line-height: 1.45;
      opacity: 0;
      transition: opacity .5s ease;
    }
    .track figure.is-on figcaption { opacity: 1; }
    .track figcaption b {
      color: var(--mute);
      font-weight: 600;
      font-variant-numeric: tabular-nums;
      margin-right: 8px;
    }
    @media (max-width: 860px) {
      .hero-grid { grid-template-columns: 1fr; }
      .shots { min-height: 380px; }
    }


    .qmark { width: 28px; height: 28px; border-radius: 7px; }
    .cname:empty { display: none; }

    h1 {
      font-size: clamp(44px, 7.2vw, 84px);
      font-weight: 500;
      letter-spacing: -.045em;
      line-height: 1.08;
      max-width: 7em;
      text-wrap: pretty;
    }
    html[lang="en"] h1 {
      max-width: 11em;
      letter-spacing: -.035em;
    }
    h1 .line {
      display: block;
      overflow: hidden;
      padding-bottom: .12em;
      margin-bottom: -.12em;
    }
    h1 .line > span {
      display: block;
      white-space: nowrap;
      animation: h1-in .9s cubic-bezier(.16,1,.3,1) both;
    }
    h1 .line:nth-child(2) > span { animation-delay: .14s; }
    @keyframes h1-in {
      from { opacity: 0; transform: translateY(1.05em); }
      to { opacity: 1; transform: none; }
    }
    .lede {
      margin-top: 28px;
      max-width: 34em;
      font-size: 18px;
      line-height: 1.55;
      color: var(--mute);
      text-wrap: pretty;
    }
    .actions { margin-top: 36px; display: flex; flex-direction: column; align-items: center; gap: 10px; width: fit-content; }
    .note { font-size: 12px; color: var(--dim); text-align: center; font-weight: 400; }
    .note b { color: inherit; font-weight: 400; }

    .diagram {
      margin-top: 88px;
      padding-top: 28px;
      border-top: 1px solid var(--line);
    }
    .diagram h2 {
      margin: 0 0 8px;
      font-size: 15px;
      font-weight: 600;
      letter-spacing: .02em;
      color: var(--ink);
    }
    .diagram svg { width: 100%; height: auto; display: block; }
    .diagram text { font-family: var(--font); }
    .flow-run {
      stroke: #111;
      stroke-width: 1.35;
      fill: none;
      stroke-dasharray: 5 11;
      stroke-linecap: round;
      animation: token-flow 1.2s linear infinite;
    }
    .flow-run.d2 { animation-delay: .2s; }
    .flow-run.d3 { animation-delay: .4s; }
    @keyframes token-flow {
      to { stroke-dashoffset: -16; }
    }
    @media (prefers-reduced-motion: reduce) {
      .flow-run { animation: none; stroke-dasharray: none; stroke: #bbb; }
      .tok { display: none; }
      h1 .line > span { animation: none; }
      .brand .qmark, .brand .cname,
      .brand > [data-i18n="title"] { animation: none; opacity: 1; }
      .brand .qmark .tail { animation: none; stroke-dashoffset: 0; }
      .brand .qmark .spark { display: none; }
    }

    .foot {
      max-width: 1180px; margin: 0 auto;
      padding: 0 40px 40px;
      display: flex; justify-content: space-between;
      font-size: 12px; color: var(--dim);
    }

    @media (max-width: 720px) {
      .bar, .page, .foot { padding-left: 20px; padding-right: 20px; }
      .page { padding-top: 40px; }
      h1 { font-size: 40px; }
      .diagram { margin-top: 56px; }
    }