@charset "utf-8";
/* ==========================================================================
   瑞丰娱乐 RUIFENG · AI 智能技术官网  —  全站样式表
   视觉语言：技术规格书 Spec Sheet
            硬边直角 / 发丝分隔线 / 朱砂信号色 / 刻度标尺 / 表格化信息
   代码结构：@layer token → base → shell → parts → page → motion
   与辉达（暖金杂志）、瑞丰旧版（暗色极光）、泰达（浅蓝卡片）、运达（纸感播控）互不重复
   ========================================================================== */

@layer token, base, shell, parts, page, motion;

/* ==========================================================================
   01 · TOKEN
   ========================================================================== */
@layer token {
  :root {
    /* 纸面 */
    --paper: #faf8f3;
    --paper-2: #f2eee5;
    --paper-3: #e8e2d5;
    --ink-paper: #1a1713;

    /* 墨色 */
    --ink: #14110f;
    --ink-2: #3b3630;
    --mute: #7c736a;
    --mute-2: #9d948a;

    /* 线 */
    --line: #ddd6c9;
    --line-2: #bdb3a3;
    --line-soft: #e9e3d7;

    /* 信号色 */
    --acc: #e04a12;
    --acc-deep: #ab380b;
    --acc-soft: #fbe8dd;
    --ok: #2f6d4f;

    /* 尺度 */
    --frame: 1280px;
    --gut: clamp(16px, 3.2vw, 44px);
    --h-top: 66px;

    /* 字体 */
    --sans: "Helvetica Neue", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
    --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;

    --ease: cubic-bezier(.2, .7, .3, 1);
    --fast: .22s var(--ease);
  }
}

/* ==========================================================================
   02 · BASE
   ========================================================================== */
@layer base {
  *,
  *::before,
  *::after { box-sizing: border-box; }

  html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--h-top) + 18px);
  }

  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink-2);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.78;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  body.is-locked { overflow: hidden; }

  h1, h2, h3, h4, h5, h6 {
    margin: 0;
    color: var(--ink);
    font-weight: 800;
    line-height: 1.16;
    letter-spacing: -.015em;
  }

  p { margin: 0; }
  ul, ol { margin: 0; padding: 0; list-style: none; }
  img { max-width: 100%; height: auto; display: block; }
  b, strong { color: var(--ink); font-weight: 700; }

  a {
    color: var(--acc-deep);
    text-decoration: none;
    transition: color var(--fast), border-color var(--fast), background var(--fast);
  }
  a:hover { color: var(--acc); }

  button, input, textarea, select { font: inherit; color: inherit; }
  button { cursor: pointer; }

  ::selection { background: var(--acc); color: #fff; }

  :focus-visible {
    outline: 2px solid var(--acc);
    outline-offset: 3px;
  }

  .skip {
    position: absolute;
    left: -9999px;
    top: 0;
    padding: 10px 16px;
    background: var(--ink);
    color: var(--paper);
    z-index: 999;
  }
  .skip:focus { left: 8px; top: 8px; color: var(--paper); }

  .sr {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
  }
}

/* ==========================================================================
   03 · SHELL（框架 / 顶栏 / 标尺 / 页脚）
   ========================================================================== */
@layer shell {
  .frame {
    width: 100%;
    max-width: var(--frame);
    margin-inline: auto;
    padding-inline: var(--gut);
  }

  /* ---------- 顶栏 ---------- */
  .topbar {
    position: sticky;
    top: 0;
    z-index: 60;
    background: rgba(250, 248, 243, .94);
    backdrop-filter: saturate(150%) blur(10px);
    border-bottom: 1px solid var(--line);
  }

  .topbar__in {
    display: flex;
    align-items: center;
    gap: clamp(12px, 2vw, 34px);
    height: var(--h-top);
  }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    color: var(--ink);
    flex: 0 0 auto;
  }

  .brand__mark {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    background: var(--ink);
    color: var(--paper);
    font-family: var(--mono);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .04em;
  }

  .brand__txt { display: flex; flex-direction: column; line-height: 1; }
  .brand__txt b { font-size: 16px; letter-spacing: .06em; }
  .brand__txt i {
    margin-top: 5px;
    font-family: var(--mono);
    font-style: normal;
    font-size: 9px;
    letter-spacing: .24em;
    color: var(--mute);
  }

  .nav { margin-left: auto; }
  .nav__list { display: flex; align-items: center; gap: clamp(6px, 1.4vw, 20px); }
  .nav__cta { display: none; }

  .nav__link {
    display: block;
    padding: 6px 2px;
    font-size: 14px;
    color: var(--ink-2);
    border-bottom: 2px solid transparent;
  }
  .nav__link:hover { color: var(--ink); border-bottom-color: var(--line-2); }
  .nav__link[aria-current="page"] {
    color: var(--ink);
    font-weight: 700;
    border-bottom-color: var(--acc);
  }

  .topbar__act { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }

  /* ---------- 标尺条 ---------- */
  .ruler {
    position: relative;
    height: 15px;
    border-top: 1px solid var(--line-soft);
    background-image: repeating-linear-gradient(
      90deg,
      var(--line-2) 0 1px,
      transparent 1px 12px
    );
    background-size: auto 5px;
    background-position: 0 100%;
    background-repeat: repeat-x;
  }
  .ruler__read {
    position: absolute;
    right: var(--gut);
    top: -1px;
    transform: translateY(-50%);
    padding: 1px 7px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: .12em;
    color: var(--mute);
    background: var(--paper);
  }

  .meter {
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 100%;
    height: 2px;
    background: transparent;
    pointer-events: none;
  }
  .meter__fill {
    display: block;
    width: 0;
    height: 100%;
    background: var(--acc);
  }

  /* ---------- 移动端开合 ---------- */
  .navtog {
    display: none;
    width: 38px;
    height: 38px;
    border: 1px solid var(--line-2);
    background: transparent;
    position: relative;
  }
  .navtog i,
  .navtog i::before,
  .navtog i::after {
    position: absolute;
    left: 50%;
    width: 16px;
    height: 1.5px;
    background: var(--ink);
    transform: translateX(-50%);
    content: "";
  }
  .navtog i { top: 50%; }
  .navtog i::before { top: -5px; }
  .navtog i::after { top: 5px; }
  .navtog i::before,
  .navtog i::after { left: 0; transform: none; }

  /* ---------- 页脚 ---------- */
  .foot {
    margin-top: 0;
    border-top: 1px solid var(--line);
    background: var(--paper-2);
    padding: clamp(38px, 5vw, 62px) 0 26px;
    font-size: 14px;
  }

  .foot__grid {
    display: grid;
    grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(120px, .7fr));
    gap: clamp(22px, 4vw, 52px);
  }

  .foot__brand p { margin-top: 14px; max-width: 34em; color: var(--mute); font-size: 13.5px; }
  .foot__brand .brand { margin-bottom: 2px; }

  .foot__h {
    margin: 0 0 12px;
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--mute-2);
  }

  .foot__col li + li { margin-top: 7px; }
  .foot__col a { color: var(--ink-2); font-size: 13.5px; }
  .foot__col a:hover { color: var(--acc); }

  .foot__note {
    margin-top: clamp(28px, 4vw, 44px);
    padding-top: 16px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    gap: 8px 26px;
    align-items: flex-start;
    color: var(--mute);
    font-size: 12.5px;
    line-height: 1.7;
  }
  .foot__note strong { color: var(--ink-2); }
  .foot__legal { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-left: auto; }

  .to-top {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 40;
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line-2);
    background: var(--paper);
    color: var(--ink);
    font-family: var(--mono);
    font-size: 13px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--fast);
  }
  .to-top.is-on { opacity: 1; visibility: visible; transform: none; }
  .to-top:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
}

/* ==========================================================================
   04 · PARTS（通用组件）
   ========================================================================== */
@layer parts {
  /* ---------- 按钮 ---------- */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 13px 22px;
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: .01em;
    line-height: 1;
    transition: all var(--fast);
    white-space: nowrap;
  }
  .btn--sm { padding: 9px 14px; font-size: 13px; }
  .btn--lg { padding: 16px 28px; font-size: 15px; }
  .btn--solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .btn--solid:hover { background: var(--acc); border-color: var(--acc); color: #fff; }
  .btn--acc { background: var(--acc); color: #fff; border-color: var(--acc); }
  .btn--acc:hover { background: var(--acc-deep); border-color: var(--acc-deep); color: #fff; }
  .btn--line { background: transparent; color: var(--ink); border-color: var(--line-2); }
  .btn--line:hover { border-color: var(--ink); background: var(--paper-2); color: var(--ink); }
  .btn__arw { font-family: var(--mono); font-size: 12px; opacity: .8; }

  .linkarrow {
    display: inline-flex;
    align-items: baseline;
    gap: 7px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--acc-deep);
  }
  .linkarrow::after { content: "→"; font-family: var(--mono); transition: transform var(--fast); }
  .linkarrow:hover::after { transform: translateX(4px); }

  /* ---------- 标签 ---------- */
  .kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--acc-deep);
  }
  .kicker::before {
    content: "";
    width: 22px;
    height: 1px;
    background: var(--acc);
  }
  .kicker--plain::before { display: none; }

  .tag {
    display: inline-block;
    padding: 3px 9px;
    border: 1px solid var(--line-2);
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .1em;
    color: var(--mute);
    text-transform: uppercase;
  }
  .tag--acc { border-color: var(--acc); color: var(--acc-deep); background: var(--acc-soft); }
  .tags { display: flex; flex-wrap: wrap; gap: 7px; }

  /* ---------- 章节 ---------- */
  .band {
    position: relative;
    border-top: 1px solid var(--line);
    padding: clamp(46px, 6.4vw, 88px) 0;
  }
  .band--tight { padding: clamp(34px, 4vw, 56px) 0; }
  .band--paper2 { background: var(--paper-2); }
  .band--ink {
    background: var(--ink-paper);
    border-top-color: #2b2621;
    color: #c9c1b6;
  }
  .band--ink h1, .band--ink h2, .band--ink h3, .band--ink b, .band--ink strong { color: #f6f1e8; }
  .band--ink .band__no { color: #8a8177; }
  .band--ink .kicker { color: #f0a184; }
  .band--ink .kicker::before { background: var(--acc); }
  .band--ink .lede { color: #b3aa9e; }
  .band--ink .plate { background: #201c18; border-color: #35302a; }
  .band--ink .tag { border-color: #453f38; color: #9c9287; }

  .band__head {
    display: grid;
    grid-template-columns: 82px minmax(0, 1fr) minmax(0, .85fr);
    gap: clamp(14px, 3vw, 42px);
    align-items: start;
    margin-bottom: clamp(26px, 3.6vw, 46px);
  }
  .band__no {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .16em;
    color: var(--mute-2);
    padding-top: .55em;
  }
  .band__title .kicker { margin-bottom: 12px; }
  .band__note {
    font-size: 14px;
    color: var(--mute);
    padding-top: .5em;
    border-left: 1px solid var(--line);
    padding-left: clamp(14px, 2vw, 26px);
  }

  .h1 {
    font-size: clamp(2.15rem, 5.4vw, 4rem);
    line-height: 1.06;
    letter-spacing: -.03em;
  }
  .h2 {
    font-size: clamp(1.5rem, 2.9vw, 2.3rem);
    letter-spacing: -.02em;
  }
  .h3 {
    font-size: clamp(1.1rem, 1.6vw, 1.3rem);
    letter-spacing: -.01em;
  }
  .h4 { font-size: 1rem; }

  .lede {
    margin-top: 16px;
    font-size: clamp(15px, 1.15vw, 17px);
    line-height: 1.8;
    color: var(--ink-2);
    max-width: 46em;
  }

  .mark {
    background: linear-gradient(transparent 62%, var(--acc-soft) 62%);
    color: var(--ink);
    font-weight: 700;
  }

  .rule { height: 1px; background: var(--line); border: 0; margin: 0; }

  /* ---------- 栅格 ---------- */
  .cols { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
  .cols > * { background: var(--paper); }
  .cell { padding: clamp(20px, 2.4vw, 30px); }
  .band--ink .cols { background: #35302a; border-color: #35302a; }
  .band--ink .cols > * { background: #201c18; }
  .cols--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cols--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cols--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .band--paper2 .cols > * { background: var(--paper-2); }

  /* ---------- 平板块 ---------- */
  .plate {
    display: flex;
    flex-direction: column;
    background: var(--paper);
    border: 1px solid var(--line);
    padding: clamp(20px, 2.4vw, 30px);
    transition: border-color var(--fast), background var(--fast);
  }
  .plate--flush { padding: 0; overflow: hidden; }
  .plate--hover:hover { border-color: var(--line-2); }
  .plate--hover:hover .plate__no { color: var(--acc); }
  .plate__no {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .18em;
    color: var(--mute-2);
    transition: color var(--fast);
  }
  .plate__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--line-soft);
  }
  .plate__fig {
    position: relative;
    aspect-ratio: 16 / 10;
    border-bottom: 1px solid var(--line);
    background:
      radial-gradient(circle at 26% 22%, rgba(224, 74, 18, .16), transparent 58%),
      repeating-linear-gradient(90deg, rgba(20, 17, 15, .07) 0 1px, transparent 1px 15px),
      repeating-linear-gradient(0deg, rgba(20, 17, 15, .05) 0 1px, transparent 1px 15px),
      var(--paper-2);
    overflow: hidden;
  }
  .plate__fig::before {
    content: "";
    position: absolute;
    inset: 22% 18%;
    border: 1px solid rgba(20, 17, 15, .28);
    background: linear-gradient(135deg, rgba(224, 74, 18, .1), transparent 55%);
  }
  .plate__fig::after {
    content: attr(data-code);
    position: absolute;
    left: 12px;
    bottom: 10px;
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: .16em;
    color: var(--mute);
  }
  .plate__fig--halftone::before {
    inset: 0;
    border: 0;
    background-image: radial-gradient(circle, rgba(20, 17, 15, .3) 1px, transparent 1.4px);
    background-size: 9px 9px;
    -webkit-mask-image: radial-gradient(circle at 70% 50%, #000 12%, transparent 68%);
    mask-image: radial-gradient(circle at 70% 50%, #000 12%, transparent 68%);
  }
  .plate__fig--arc::before {
    inset: auto -12% -30% 22%;
    aspect-ratio: 1;
    border-radius: 50%;
    border: 1px solid rgba(224, 74, 18, .5);
    background: radial-gradient(circle, rgba(224, 74, 18, .14), transparent 62%);
  }
  .plate__body { padding: clamp(18px, 2.2vw, 26px); }

  .plate__body h3 + p { margin-top: 10px; }
  .plate__body p { font-size: 14px; color: var(--mute); }
  .plate__list { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line-soft); }
  .plate__list li {
    position: relative;
    padding-left: 14px;
    font-size: 13.5px;
    color: var(--ink-2);
  }
  .plate__list li + li { margin-top: 6px; }
  .plate__list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: .78em;
    width: 5px;
    height: 1px;
    background: var(--acc);
  }

  /* ---------- 指标 ---------- */
  .metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .metric { padding: clamp(16px, 2.2vw, 26px) 0; padding-right: 18px; }
  .metric + .metric { border-left: 1px solid var(--line); padding-left: clamp(16px, 2.2vw, 26px); }
  .metric b {
    display: block;
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    line-height: 1;
    letter-spacing: -.03em;
    font-variant-numeric: tabular-nums;
  }
  .metric b i { font-style: normal; font-size: .5em; color: var(--mute); margin-left: 3px; }
  .metric span {
    display: block;
    margin-top: 9px;
    font-size: 12.5px;
    color: var(--mute);
    letter-spacing: .02em;
  }
  .band--ink .metric + .metric { border-color: #35302a; }
  .band--ink .metrics { border-color: #35302a; }

  /* ---------- 规格定义表 ---------- */
  .spec { margin: 0; border-top: 1px solid var(--line); }
  .spec__row {
    display: grid;
    grid-template-columns: minmax(88px, .42fr) minmax(0, 1fr);
    gap: 10px 18px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    transition: background var(--fast);
  }
  .spec__row:hover { background: var(--paper-2); }
  .spec__row dt {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--mute-2);
    padding-top: .28em;
  }
  .spec__row dd {
    margin: 0;
    font-size: 14px;
    color: var(--ink-2);
  }
  .spec__row dd b { font-weight: 700; }

  /* ---------- 表格 ---------- */
  .tblwrap { overflow-x: auto; border: 1px solid var(--line); }
  .tbl { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 14px; }
  .tbl caption {
    text-align: left;
    padding: 12px 16px;
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--mute-2);
    border-bottom: 1px solid var(--line);
    background: var(--paper-2);
  }
  .tbl th, .tbl td {
    padding: 13px 16px;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--line-soft);
  }
  .tbl thead th {
    font-family: var(--mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: .13em;
    text-transform: uppercase;
    color: var(--mute);
    background: var(--paper-2);
    border-bottom: 1px solid var(--line);
    white-space: nowrap;
  }
  .tbl tbody tr:hover { background: var(--paper-2); }
  .tbl tbody tr:last-child td { border-bottom: 0; }
  .tbl td b { color: var(--ink); }
  .tbl .num { font-family: var(--mono); font-size: 12.5px; color: var(--ink); white-space: nowrap; }

  /* ---------- 步骤 ---------- */
  .steps { border-top: 1px solid var(--line); counter-reset: st; }
  .steps > li {
    counter-increment: st;
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 18px;
    padding: clamp(16px, 2.2vw, 24px) 0;
    border-bottom: 1px solid var(--line);
  }
  .steps > li::before {
    content: "0" counter(st);
    grid-row: span 2;
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .1em;
    color: var(--acc);
    padding-top: .3em;
  }
  .steps h4 { font-size: 15.5px; }
  .steps p { margin-top: 6px; font-size: 13.8px; color: var(--mute); }

  /* ---------- 选项卡 ---------- */
  .tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    border: 1px solid var(--line);
    border-bottom: 0;
  }
  .tabs__btn {
    flex: 1 1 auto;
    padding: 13px 18px;
    border: 0;
    border-right: 1px solid var(--line);
    background: var(--paper-2);
    color: var(--mute);
    font-size: 13.5px;
    font-weight: 600;
    text-align: left;
    transition: all var(--fast);
  }
  .tabs__btn:last-child { border-right: 0; }
  .tabs__btn:hover { color: var(--ink); background: var(--paper-3); }
  .tabs__btn[aria-selected="true"] {
    background: var(--paper);
    color: var(--ink);
    box-shadow: inset 0 2px 0 var(--acc);
  }
  .tabpanel {
    border: 1px solid var(--line);
    padding: clamp(20px, 2.6vw, 32px);
  }
  .tabpanel[hidden] { display: none; }

  /* ---------- 折叠 ---------- */
  .acc { border-top: 1px solid var(--line); }
  .acc__item { border-bottom: 1px solid var(--line); }
  .acc__h {
    width: 100%;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 0;
    border: 0;
    background: transparent;
    text-align: left;
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
  }
  .acc__h:hover { color: var(--acc-deep); }
  .acc__h::after {
    content: "+";
    margin-left: auto;
    font-family: var(--mono);
    font-size: 17px;
    color: var(--acc);
    line-height: 1.1;
    transition: transform var(--fast);
  }
  .acc__item.is-open .acc__h::after { transform: rotate(45deg); }
  .acc__b {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows .32s var(--ease);
  }
  .acc__item.is-open .acc__b { grid-template-rows: 1fr; }
  .acc__b > div { overflow: hidden; }
  .acc__b p {
    padding: 0 0 18px;
    font-size: 14px;
    color: var(--mute);
    max-width: 62em;
  }

  /* ---------- 代码块 ---------- */
  .code {
    margin: 0;
    padding: 16px 18px;
    border: 1px solid var(--line);
    background: var(--ink-paper);
    color: #e9e3d7;
    font-family: var(--mono);
    font-size: 12.5px;
    line-height: 1.95;
    overflow-x: auto;
    white-space: pre;
    tab-size: 2;
  }

  /* ---------- 引用 ---------- */
  .quote {
    margin: 0;
    padding: clamp(20px, 3vw, 32px);
    border-left: 2px solid var(--acc);
    background: var(--paper-2);
  }
  .quote p {
    font-size: clamp(15px, 1.5vw, 18px);
    line-height: 1.8;
    color: var(--ink);
    font-weight: 500;
  }
  .quote cite {
    display: block;
    margin-top: 14px;
    font-style: normal;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .12em;
    color: var(--mute);
  }

  /* ---------- 面包屑 ---------- */
  .crumb {
    padding: 12px 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 12px;
    color: var(--mute);
  }
  .crumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
  .crumb li { display: flex; align-items: center; gap: 6px; }
  .crumb li + li::before { content: "/"; color: var(--line-2); font-family: var(--mono); }
  .crumb a { color: var(--mute); }
  .crumb a:hover { color: var(--acc); }
  .crumb [aria-current] { color: var(--ink-2); }

  /* ---------- 分页/翻页 ---------- */
  .pager {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    margin-top: 40px;
  }
  .pager a {
    background: var(--paper);
    padding: 18px 20px;
    color: var(--ink);
    transition: background var(--fast);
  }
  .pager a:hover { background: var(--paper-2); }
  .pager span {
    display: block;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: .16em;
    color: var(--mute-2);
    text-transform: uppercase;
    margin-bottom: 6px;
  }
  .pager b { font-size: 14.5px; font-weight: 600; }
  .pager a:last-child { text-align: right; }
}

/* ==========================================================================
   05 · PAGE（首页 / 内页 / 文章 / 表单 / 404）
   ========================================================================== */
@layer page {
  /* ---------- 首屏 ---------- */
  .hero {
    position: relative;
    padding: clamp(34px, 5vw, 62px) 0 clamp(36px, 5vw, 64px);
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image:
      linear-gradient(90deg, rgba(20,17,15,.035) 1px, transparent 1px),
      linear-gradient(0deg, rgba(20,17,15,.035) 1px, transparent 1px);
    background-size: 88px 88px;
    -webkit-mask-image: linear-gradient(180deg, #000, transparent 78%);
    mask-image: linear-gradient(180deg, #000, transparent 78%);
  }
  .hero__grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .78fr);
    gap: clamp(24px, 4vw, 64px);
    align-items: start;
  }
  .hero__h1 { margin-top: 18px; }
  .hero__h1 em {
    font-style: normal;
    display: block;
    color: var(--acc);
  }
  .hero__lede {
    margin-top: 20px;
    font-size: clamp(15px, 1.2vw, 17px);
    max-width: 40em;
    color: var(--ink-2);
  }
  .hero__cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
  .hero__tags { margin-top: 26px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 12.5px; color: var(--mute); }
  .hero__tags li { display: flex; align-items: center; gap: 7px; }
  .hero__tags li::before { content: ""; width: 4px; height: 4px; background: var(--acc); }

  .hero__aside { position: relative; border: 1px solid var(--line); background: var(--paper); }
  .hero__aside-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid var(--line);
    background: var(--paper-2);
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--mute);
  }
  .hero__aside-top i { font-style: normal; color: var(--acc); }
  .hero__aside .spec { border-top: 0; padding: 4px 16px 10px; }
  .hero__aside .spec__row { grid-template-columns: 74px minmax(0, 1fr); }
  .hero__aside .spec__row:last-child { border-bottom: 0; }
  .hero__aside-foot {
    padding: 12px 16px;
    border-top: 1px solid var(--line);
    font-size: 12.5px;
    color: var(--mute);
    background: var(--paper-2);
  }

  .ticker {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 20px;
    padding: 9px 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    overflow: hidden;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .1em;
    color: var(--mute);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  }
  .ticker__track {
    display: flex;
    flex: 0 0 auto;
    gap: 34px;
    padding-right: 34px;
    animation: tick 38s linear infinite;
    white-space: nowrap;
  }
  .ticker__track i { font-style: normal; color: var(--acc); }
  @keyframes tick { to { transform: translateX(-50%); } }

  /* ---------- 内页页头 ---------- */
  .pagehead {
    padding: clamp(26px, 3.6vw, 46px) 0 clamp(28px, 4vw, 48px);
    border-bottom: 1px solid var(--line);
    background:
      radial-gradient(900px 240px at 82% -30%, var(--acc-soft), transparent 70%),
      var(--paper);
  }
  .pagehead__in {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: clamp(20px, 4vw, 60px);
    align-items: end;
  }
  .pagehead .h1 { font-size: clamp(1.9rem, 4.2vw, 3.1rem); margin-top: 14px; }
  .pagehead__meta {
    margin-top: 22px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
    font-size: 12.5px;
    color: var(--mute);
  }
  .pagehead__meta b { color: var(--ink); font-weight: 600; }
  .pagehead__aside {
    border-left: 1px solid var(--line);
    padding-left: clamp(16px, 2.4vw, 30px);
    font-size: 13.5px;
    color: var(--mute);
  }
  .pagehead__aside .btn { margin-top: 16px; }

  /* ---------- 通用两栏 ---------- */
  .split {
    display: grid;
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(24px, 4vw, 64px);
    align-items: start;
  }
  .split--rev { grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr); }
  .split__sticky { position: sticky; top: calc(var(--h-top) + 34px); }

  /* ---------- 案例 ---------- */
  .case {
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    margin-bottom: 1px;
  }
  .case__fig {
    position: relative;
    min-height: 220px;
    background:
      radial-gradient(circle at 30% 30%, rgba(224, 74, 18, .18), transparent 58%),
      repeating-linear-gradient(45deg, rgba(20,17,15,.06) 0 1px, transparent 1px 13px),
      var(--paper-2);
  }
  .case__fig span {
    position: absolute;
    left: 18px;
    bottom: 14px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: .18em;
    color: var(--mute);
  }
  .case__fig::after {
    content: "";
    position: absolute;
    inset: 18% 14%;
    border: 1px solid rgba(20,17,15,.22);
  }
  .case__body { background: var(--paper); padding: clamp(22px, 3vw, 38px); }
  .case__body h3 { margin-top: 12px; font-size: clamp(1.15rem, 1.8vw, 1.45rem); }
  .case__body p { margin-top: 12px; font-size: 14px; color: var(--mute); }
  .case__res {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid var(--line-soft);
    display: flex;
    flex-wrap: wrap;
    gap: 10px 30px;
  }
  .case__res div { font-size: 12.5px; color: var(--mute); }
  .case__res b { display: block; font-size: 17px; color: var(--ink); letter-spacing: -.01em; }

  /* ---------- 文章 ---------- */
  .post { padding: clamp(28px, 4vw, 52px) 0 clamp(40px, 5vw, 70px); }
  .post__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 276px;
    gap: clamp(26px, 4vw, 64px);
    align-items: start;
  }
  .post__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .1em;
    color: var(--mute);
    text-transform: uppercase;
  }
  .post__body { margin-top: 26px; max-width: 46em; }
  .post__body h2 {
    margin: 34px 0 12px;
    font-size: clamp(1.25rem, 2vw, 1.55rem);
    padding-top: 14px;
    border-top: 1px solid var(--line);
  }
  .post__body h3 { margin: 24px 0 8px; font-size: 1.05rem; }
  .post__body p { margin: 12px 0; font-size: 15.5px; }
  .post__body ul, .post__body ol { margin: 12px 0; }
  .post__body li {
    position: relative;
    padding-left: 20px;
    margin: 7px 0;
    font-size: 15.5px;
  }
  .post__body ul li::before {
    content: "";
    position: absolute;
    left: 4px;
    top: .85em;
    width: 6px;
    height: 1px;
    background: var(--acc);
  }
  .post__body ol { counter-reset: p; }
  .post__body ol li { counter-increment: p; }
  .post__body ol li::before {
    content: counter(p) ".";
    position: absolute;
    left: 0;
    font-family: var(--mono);
    font-size: 12px;
    color: var(--acc);
  }
  .post__body .callout {
    margin: 22px 0;
    padding: 16px 20px;
    border: 1px solid var(--line);
    border-left: 2px solid var(--acc);
    background: var(--paper-2);
    font-size: 14.5px;
    color: var(--ink-2);
  }
  .post__aside { position: sticky; top: calc(var(--h-top) + 30px); }
  .post__aside .plate { margin-bottom: 16px; }
  .post__aside h4 {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--mute-2);
    margin-bottom: 12px;
  }
  .toc li + li { margin-top: 8px; }
  .toc a { font-size: 13px; color: var(--ink-2); }
  .toc a:hover { color: var(--acc); }

  /* ---------- 列表页 ---------- */
  .list { border-top: 1px solid var(--line); }
  .list__item {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr) 92px;
    gap: clamp(12px, 2.4vw, 34px);
    padding: clamp(18px, 2.6vw, 28px) 0;
    border-bottom: 1px solid var(--line);
    align-items: baseline;
  }
  .list__date { font-family: var(--mono); font-size: 11.5px; letter-spacing: .1em; color: var(--mute-2); }
  .list__item h3 { font-size: clamp(1.02rem, 1.6vw, 1.24rem); }
  .list__item h3 a { color: var(--ink); }
  .list__item h3 a:hover { color: var(--acc-deep); }
  .list__item p { margin-top: 8px; font-size: 13.8px; color: var(--mute); max-width: 56em; }
  .list__go { text-align: right; font-family: var(--mono); font-size: 11px; color: var(--mute-2); }

  /* ---------- 表单 ---------- */
  .form { display: grid; gap: 16px; }
  .form__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .field { display: flex; flex-direction: column; gap: 7px; }
  .field > label {
    font-family: var(--mono);
    font-size: 10.5px;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--mute-2);
  }
  .field input, .field select, .field textarea {
    width: 100%;
    padding: 12px 14px;
    background: var(--paper);
    border: 1px solid var(--line-2);
    font-size: 14px;
    color: var(--ink);
    transition: border-color var(--fast), box-shadow var(--fast);
  }
  .field input:focus, .field select:focus, .field textarea:focus {
    outline: 0;
    border-color: var(--acc);
    box-shadow: inset 0 0 0 1px var(--acc);
  }
  .field textarea { min-height: 120px; resize: vertical; }
  .field__hint { font-size: 12px; color: var(--mute-2); }
  .check { display: flex; gap: 10px; align-items: flex-start; font-size: 12.8px; color: var(--mute); }
  .check input { margin-top: 4px; accent-color: var(--acc); }
  .form__note {
    padding: 14px 16px;
    border: 1px solid var(--line);
    background: var(--paper-2);
    font-size: 12.8px;
    color: var(--mute);
  }

  .console {
    display: grid;
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
  .console__panel { border: 1px solid var(--line); background: var(--paper); }
  .console__tabs { display: flex; border-bottom: 1px solid var(--line); }
  .console__tab {
    flex: 1;
    padding: 13px;
    border: 0;
    border-right: 1px solid var(--line);
    background: var(--paper-2);
    color: var(--mute);
    font-size: 13.5px;
    font-weight: 600;
  }
  .console__tab:last-child { border-right: 0; }
  .console__tab[aria-selected="true"] { background: var(--paper); color: var(--ink); box-shadow: inset 0 2px 0 var(--acc); }
  .console__body { padding: clamp(20px, 2.6vw, 30px); }
  .console__side { font-size: 13.8px; color: var(--mute); }
  .console__side h3 { font-size: 1rem; margin-bottom: 10px; }
  .console__side .spec { margin-top: 16px; }

  /* ---------- 页面级钩子（只做轻量差异，不覆盖通用组件） ---------- */
  .page--note .post { padding-top: clamp(20px, 3vw, 34px); }
  .page--cases .case:last-of-type { margin-bottom: 0; }
  .page--console .console__panel { background: #fff; }
  .page--404 .error { padding-top: clamp(36px, 6vw, 74px); }
  .page--404 .foot { border-top: 0; background: transparent; }

  /* ---------- 404 ---------- */
  .error { padding: clamp(50px, 9vw, 110px) 0; }
  .error__code {
    font-family: var(--mono);
    font-size: clamp(4.5rem, 16vw, 11rem);
    line-height: .86;
    letter-spacing: -.06em;
    color: var(--ink);
  }
  .error__code span { color: var(--acc); }
  .error__grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    gap: clamp(24px, 5vw, 70px);
    align-items: end;
  }

  /* ---------- 收尾 CTA ---------- */
  .cta {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) auto;
    gap: clamp(20px, 4vw, 50px);
    align-items: center;
  }
  .cta h2 { font-size: clamp(1.5rem, 3.2vw, 2.4rem); }
  .cta p { margin-top: 12px; color: var(--mute); font-size: 14.5px; }
  .cta__btns { display: flex; flex-wrap: wrap; gap: 10px; }
  .band--ink .cta p { color: #a99f93; }
}

/* ==========================================================================
   06 · MOTION
   ========================================================================== */
@layer motion {
  [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .5s var(--ease), transform .5s var(--ease);
    transition-delay: var(--d, 0ms);
  }
  [data-reveal].is-in { opacity: 1; transform: none; }

  .list__item:hover .list__go { color: var(--acc); }

  .to-top, .nav__link, .btn, .plate, .tabs__btn { will-change: auto; }
}

/* ==========================================================================
   07 · 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__aside { max-width: 560px; }
  .pagehead__in { grid-template-columns: 1fr; }
  .pagehead__aside { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 16px; }
  .post__grid { grid-template-columns: 1fr; }
  .post__aside { position: static; }
  .cols--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split, .split--rev { grid-template-columns: 1fr; }
  .split__sticky { position: static; }
  .foot__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .foot__brand { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .navtog { display: block; }
  .nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--h-top);
    margin: 0;
    display: none;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gut) 20px;
    max-height: calc(100vh - var(--h-top));
    overflow-y: auto;
    z-index: 55;
  }
  body.is-nav .nav { display: block; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__link {
    padding: 13px 0;
    border-bottom: 1px solid var(--line-soft);
    border-left: 0;
    font-size: 15px;
  }
  .nav__link[aria-current="page"] { border-bottom-color: var(--acc); }
  .nav .nav__cta { display: flex; gap: 8px; margin-top: 16px; }
  .nav .nav__cta .btn { flex: 1; }
  .topbar__act .btn { display: none; }
  .topbar__act .btn--solid { display: inline-flex; }
  .band__head { grid-template-columns: 52px minmax(0, 1fr); }
  .band__note { grid-column: 2; border-left: 0; padding-left: 0; padding-top: 12px; border-top: 1px solid var(--line); }
  .case { grid-template-columns: 1fr; }
  .case__fig { min-height: 170px; }
  .list__item { grid-template-columns: 1fr; gap: 8px; }
  .list__go { text-align: left; }
  .cta { grid-template-columns: 1fr; }
  .console { grid-template-columns: 1fr; }
  .error__grid { grid-template-columns: 1fr; }
  .pager { grid-template-columns: 1fr; }
  .pager a:last-child { text-align: left; }
  .cols--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  :root { --h-top: 60px; }
  body { font-size: 15.5px; }
  .brand__txt i { display: none; }
  .topbar__in { gap: 10px; }
  .ruler__read { display: none; }
  .cols--2, .cols--3, .cols--4 { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .foot__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot__legal { margin-left: 0; }
  .metric + .metric { padding-left: 16px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metric:nth-child(odd) { padding-left: 0; border-left: 0; }
  .steps > li { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; }
  .spec__row { grid-template-columns: 1fr; gap: 4px; }
  .hero__cta .btn { flex: 1 1 100%; }
  .ticker { font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .topbar, .to-top, .foot, .hero::before { display: none; }
  body { background: #fff; }
  .band { break-inside: avoid; }
}