/* ==========================================================================
   关关 Guanguan · 法务与支持站点
   设计语言：Swiss Minimal — 网格 / 发丝线 / 近黑与纸白 / 单一信号红
   作者注：无外部字体、无外部依赖、无构建步骤。
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 令牌 Tokens
   -------------------------------------------------------------------------- */
:root {
  /* 表面 —— 纯黑白（无暖调） */
  --paper:      #ffffff;
  --paper-2:    #f4f4f6;
  --paper-3:    #e8e8ec;
  --raise:      0 0 0 1px var(--hair);

  /* 墨色层级（中性灰阶） */
  --ink:        #0a0a0b;
  --ink-2:      #52525b;
  --ink-3:      #8a8a93;
  --ink-4:      #b4b4bd;

  /* 线 —— 中性发丝 */
  --hair:       #e6e6ea;
  --hair-2:     #d2d2d8;
  --hair-3:     #0a0a0b;

  /* 强调 —— 仅黑白（液体玻璃美学下，强调即墨色本身） */
  --accent:     #0a0a0b;
  --accent-2:   #000000;
  --sel:        rgba(10, 10, 11, .14);

  /* 液体玻璃材质令牌（liquid glass） */
  --glass-bg:         rgba(255, 255, 255, 0.55);
  --glass-bg-strong:  rgba(255, 255, 255, 0.72);
  --glass-border:     rgba(255, 255, 255, 0.65);
  --glass-hi:         rgba(255, 255, 255, 0.70);
  --glass-shadow:     0 8px 32px rgba(10, 10, 11, 0.10), inset 0 1px 0 var(--glass-hi);
  --glass-blur:       saturate(180%) blur(20px);

  /* 字族 */
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
          Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono",
          Menlo, Consolas, "Liberation Mono", monospace;

  /* 字号（流体标度） */
  --t-display: clamp(1.85rem, 7.4vw, 6.25rem);
  --t-h1:      clamp(2rem, 5.2vw, 3.75rem);
  --t-h2:      clamp(1.25rem, 2.2vw, 1.75rem);
  --t-h3:      clamp(1.0625rem, 1.4vw, 1.1875rem);
  --t-body:    clamp(0.9688rem, 0.34vw + 0.9rem, 1.0625rem);
  --t-small:   0.875rem;
  --t-label:   0.6875rem;

  /* 律动 */
  --lh-tight:  1.04;
  --lh-snug:   1.32;
  --lh-body:   1.86;

  /* 空间 8pt 基准 */
  --u:          8px;
  --measure:    68ch;
  --shell:      1240px;
  --gutter:     clamp(20px, 5.2vw, 72px);
  --topbar:     61px;

  /* 缓动 */
  --e-out:      cubic-bezier(.22, 1, .36, 1);
  --e-io:       cubic-bezier(.65, .05, .36, 1);
  --d-fast:     .18s;
  --d-mid:      .42s;
  --d-slow:     .8s;
}

:root[data-theme="dark"] {
  --paper:      #0a0a0b;
  --paper-2:    #161618;
  --paper-3:    #1e1e22;
  --ink:        #f4f4f2;
  --ink-2:      #a6a6ae;
  --ink-3:      #74747e;
  --ink-4:      #4a4a52;
  --hair:       #26262b;
  --hair-2:     #3a3a42;
  --hair-3:     #f4f4f2;
  --accent:     #f4f4f2;
  --accent-2:   #ffffff;
  --sel:        rgba(244, 244, 242, .20);

  /* 液体玻璃 · 深色 */
  --glass-bg:         rgba(28, 28, 32, 0.50);
  --glass-bg-strong:  rgba(40, 40, 46, 0.62);
  --glass-border:     rgba(255, 255, 255, 0.14);
  --glass-hi:         rgba(255, 255, 255, 0.10);
  --glass-shadow:     0 8px 32px rgba(0, 0, 0, 0.45), inset 0 1px 0 var(--glass-hi);
  --glass-blur:       saturate(160%) blur(20px);
}

/* --------------------------------------------------------------------------
   2. 复位与基础
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar) + 24px);
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image: radial-gradient(120% 70% at 50% -10%, var(--paper-2) 0%, transparent 55%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: var(--lh-body);
  font-feature-settings: "tnum" 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
  hanging-punctuation: first allow-end;
  overflow-x: hidden;
  transition: background-color var(--d-slow) var(--e-out),
              color var(--d-slow) var(--e-out);
}

body.is-locked { overflow: hidden; }

::selection { background: var(--sel); color: var(--ink); }

img, svg { display: block; max-width: 100%; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

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

.sr {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}

.skip {
  position: fixed; top: 8px; left: 8px; z-index: 999;
  transform: translateY(-160%);
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; font: 500 var(--t-small)/1 var(--sans);
  transition: transform var(--d-fast) var(--e-out);
}
.skip:focus { transform: translateY(0); }

/* --------------------------------------------------------------------------
   3. 装饰层：网格 / 顶部进度
   -------------------------------------------------------------------------- */
.grids {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to right, var(--hair) 0 1px, transparent 1px 8.3333%);
  background-size: min(var(--shell), 100%) 100%;
  background-position: 50% 0;
  background-repeat: no-repeat;
  opacity: .55;
}
:root[data-theme="dark"] .grids { opacity: .4; }

/* 胶片颗粒叠层已移除：改纯黑白 + 液体玻璃美学（见 :root 的 --glass-* 令牌）。 */

.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px;
  z-index: 60; pointer-events: none;
}
.progress i {
  display: block; height: 100%; width: 100%;
  background: var(--ink);
  transform: scaleX(var(--p, 0));
  transform-origin: 0 50%;
}

/* --------------------------------------------------------------------------
   4. 顶栏
   -------------------------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: var(--topbar);
  display: flex; align-items: center; gap: 24px;
  padding: 0 var(--gutter);
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.brand__mark {
  width: 22px; height: 22px; flex: none;
  border: 1.5px solid var(--ink); border-radius: 50%;
  position: relative;
  transition: transform var(--d-mid) var(--e-out);
}
.brand__mark::after {
  content: ""; position: absolute; inset: 4.5px;
  background: var(--accent); border-radius: 50%;
  transition: transform var(--d-mid) var(--e-out), background-color var(--d-mid) var(--e-out);
}
.brand:hover .brand__mark { transform: rotate(-45deg); }
.brand:hover .brand__mark::after { transform: scale(.72); }

.brand__name {
  font-size: var(--t-small); font-weight: 600;
  letter-spacing: .01em;
}
.brand__name span {
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-3); margin-left: 8px; vertical-align: 1px;
}

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  position: relative;
  padding: 7px 13px; border-radius: 999px;
  font-size: var(--t-small); color: var(--ink-2);
  transition: color var(--d-fast) var(--e-out),
              background-color var(--d-fast) var(--e-out);
}
.nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 1px;
  height: 1px; background: var(--accent);
  animation: rule var(--d-mid) var(--e-out) both;
}
@keyframes rule { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.theme {
  position: relative;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--hair);
  display: grid; place-items: center; flex: none;
  color: var(--ink-2);
  transition: border-color var(--d-fast) var(--e-out),
              color var(--d-fast) var(--e-out),
              transform var(--d-mid) var(--e-out);
}
.theme:hover { color: var(--ink); border-color: var(--hair-2); transform: rotate(35deg); }
.theme svg { width: 15px; height: 15px; }
.theme .m-sun, .theme .m-moon { transition: opacity var(--d-mid) var(--e-out), transform var(--d-mid) var(--e-out); }
.theme .m-moon { position: absolute; opacity: 0; transform: scale(.4) rotate(-40deg); }
:root[data-theme="dark"] .theme .m-sun { opacity: 0; transform: scale(.4) rotate(40deg); }
:root[data-theme="dark"] .theme .m-moon { opacity: 1; transform: none; }

.navtoggle {
  display: none; width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--hair); place-items: center; color: var(--ink-2);
}
.navtoggle i { display: block; width: 14px; height: 1px; background: currentColor; position: relative; }
.navtoggle i::before, .navtoggle i::after {
  content: ""; position: absolute; left: 0; width: 14px; height: 1px;
  background: currentColor;
  transition: transform var(--d-mid) var(--e-out);
}
.navtoggle i::before { top: -4.5px; }
.navtoggle i::after  { top: 4.5px; }
body.nav-open .navtoggle i { background: transparent; }
body.nav-open .navtoggle i::before { transform: translateY(4.5px) rotate(45deg); }
body.nav-open .navtoggle i::after  { transform: translateY(-4.5px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   5. 骨架
   -------------------------------------------------------------------------- */
.shell {
  position: relative; z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) calc(var(--u) * 14);
}

.hero { padding: clamp(56px, 11vw, 132px) 0 clamp(40px, 6vw, 76px); }

.eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: clamp(20px, 3vw, 34px);
}
.eyebrow::after {
  content: ""; flex: 1; height: 1px; background: var(--hair);
  transform-origin: 0 50%; transform: scaleX(var(--sx, 1));
}

h1 {
  margin: 0;
  font-size: var(--t-display);
  line-height: var(--lh-tight);
  letter-spacing: -.045em;
  font-weight: 600;
  text-wrap: balance;
}
h1 em {
  font-style: normal;
  color: var(--ink-3);
  letter-spacing: -.05em;
}

.hero__lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  line-height: 1.62;
  color: var(--ink-2);
  text-wrap: pretty;
}

.factbar {
  display: flex; flex-wrap: wrap; gap: 0;
  margin-top: clamp(36px, 5vw, 60px);
  border-top: 1px solid var(--hair);
}
.factbar div {
  padding: 18px 26px 18px 0;
  margin-right: 26px;
  border-right: 1px solid var(--hair);
}
.factbar div:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.factbar dt {
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 6px;
}
.factbar dd {
  margin: 0; font-size: var(--t-small); font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* 正文栅格 */
.doc {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: clamp(32px, 5.5vw, 88px);
  align-items: start;
}

/* --------------------------------------------------------------------------
   6. 左栏：曝光计 + 目录
   -------------------------------------------------------------------------- */
.index {
  position: sticky; top: calc(var(--topbar) + 34px);
  max-height: calc(100vh - var(--topbar) - 68px);
  display: flex; flex-direction: column;
  padding-right: 4px;
}

.meter { position: relative; height: 44px; margin-bottom: 20px; }
.meter__row {
  position: absolute; inset: 0;
  display: flex; align-items: flex-end; gap: 1px;
}
.meter i {
  flex: 1 1 0; height: calc(var(--h) * 100%);
  background: var(--hair-2);
  transition: height var(--d-slow) var(--e-out);
}
.meter__row--fill {
  clip-path: inset(calc((1 - var(--p, 0)) * 100%) 0 0 0);
}
.meter__row--fill i { background: var(--ink); }
:root[data-theme="dark"] .meter__row--fill i { background: var(--accent); }

.meter__cap {
  position: absolute; right: 0; top: -6px;
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .12em; color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.index__label {
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 10px; margin-bottom: 8px;
  border-bottom: 1px solid var(--hair);
}

.index__pages { display: none; }

.index ol { list-style: none; margin: 0; padding: 0; position: relative; overflow-y: auto; min-height: 0; flex: 0 1 auto; }
.index__rail {
  position: absolute; left: 0; top: 0; width: 1px; height: 100%;
  background: var(--hair); margin: 0; list-style: none;
}
.index__active {
  position: absolute; left: 0; top: 0; width: 1px; height: 20px;
  background: var(--accent); margin: 0; list-style: none;
  transform: translateY(var(--y, 0));
  transition: transform var(--d-mid) var(--e-out), opacity var(--d-fast) linear;
  opacity: 0;
}
.index__active.on { opacity: 1; }

.index li a {
  display: grid; grid-template-columns: 26px 1fr; gap: 6px;
  padding: 5px 0 5px 14px;
  font-size: 0.8125rem; line-height: 1.5;
  color: var(--ink-3);
  transition: color var(--d-fast) var(--e-out), transform var(--d-fast) var(--e-out);
}
.index li a:hover { color: var(--ink); transform: translateX(2px); }
.index li a b { font-family: var(--mono); font-weight: 400; font-size: 10px; letter-spacing: .06em; padding-top: 3px; }
.index li a[aria-current="true"] { color: var(--ink); font-weight: 600; }

.index__foot {
  margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--hair);
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  color: var(--ink-4); text-transform: uppercase; line-height: 1.9;
}

/* --------------------------------------------------------------------------
   7. 正文排版
   -------------------------------------------------------------------------- */
main .sect {
  max-width: var(--measure);
  display: flex; flex-direction: column; gap: 1.05em;
  padding: clamp(40px, 5vw, 64px) 0;
  border-top: 1px solid var(--hair);
}
main .sect:first-of-type { border-top: 0; padding-top: 0; }

main .sect p { margin: 0; color: var(--ink-2); text-wrap: pretty; }
main .sect strong { color: var(--ink); font-weight: 600; }
main .sect em { font-style: normal; }

.sect h2 {
  display: grid; grid-template-columns: 34px 1fr;
  gap: 0; align-items: baseline;
  margin: 0 0 .7em;
  font-size: var(--t-h2); line-height: var(--lh-snug);
  letter-spacing: -.022em; font-weight: 600;
  text-wrap: balance;
}
.sect h2 b {
  font-family: var(--mono); font-size: 10px; font-weight: 400;
  letter-spacing: .1em; color: var(--accent);
  padding-top: .55em; font-variant-numeric: tabular-nums;
}

.sect h3 {
  margin: 1.1em 0 0;
  font-size: var(--t-h3); line-height: 1.5;
  letter-spacing: -.012em; font-weight: 600;
}

main .sect ul, main .sect ol { margin: 0; padding: 0 0 0 1.05em; color: var(--ink-2); }
main .sect li { margin: .45em 0; padding-left: .3em; }
main .sect li::marker { color: var(--ink-4); font-family: var(--mono); font-size: .82em; }
main .sect li:first-child { margin-top: 0; }
main .sect li:last-child { margin-bottom: 0; }
main .sect ul ul, main .sect ol ol,
main .sect ul ol, main .sect ol ul { margin-top: .4em; }

main .sect code, .tbl code {
  font-family: var(--mono);
  font-size: .86em;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--hair);
  border-radius: 3px;
  padding: 1px 5px;
  word-break: break-word;
}

/* 揭示动画 */
.rv { opacity: 0; transform: translateY(12px); }
.rv.in {
  opacity: 1; transform: none;
  transition: opacity var(--d-slow) var(--e-out), transform var(--d-slow) var(--e-out);
  transition-delay: var(--d, 0ms);
}

/* 链接：左起划线 */
.lnk {
  position: relative; color: var(--ink); font-weight: 500;
  white-space: nowrap;
}
.lnk::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: 0 50%;
  transition: transform var(--d-mid) var(--e-out);
}
.lnk:hover::after { transform: scaleX(1); }

.ext { display: inline-flex; align-items: baseline; gap: 3px; }
.ext svg { width: 9px; height: 9px; flex: none; transition: transform var(--d-mid) var(--e-out); }
.ext:hover svg { transform: translate(2px, -2px); }

/* --------------------------------------------------------------------------
   8. 组件
   -------------------------------------------------------------------------- */
/* 导语 */
.lead {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 24px;
  margin: 0;
}
.lead p { font-size: clamp(1.0625rem, 1.5vw, 1.25rem); line-height: 1.66; color: var(--ink); letter-spacing: -.012em; }
.lead p + p { margin-top: .8em; font-size: var(--t-body); color: var(--ink-2); }

/* 面板 · 液体玻璃 */
.panel {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  padding: clamp(22px, 3vw, 34px);
  margin: .35em 0;
}
.panel--flush { background: none; padding: 0; border: 0; }
.panel > :last-child { margin-bottom: 0; }
.panel__tag {
  font-family: var(--mono); font-size: var(--t-label);
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 14px;
}

/* 强调体（纵向条形装饰） */
.stripe { display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: start; }
.stripe::before {
  content: ""; width: 3px; align-self: stretch; min-height: 2.4em;
  background: var(--ink); border-radius: 2px;
}
.stripe--warn::before { background: var(--accent); }

/* 表格 */
.tbl { width: 100%; border-collapse: collapse; margin: .35em 0; font-size: var(--t-small); }
.tbl th, .tbl td {
  text-align: left; vertical-align: top;
  padding: 13px 18px 13px 0;
  border-bottom: 1px solid var(--hair);
}
.tbl th {
  font-family: var(--mono); font-size: 10px; font-weight: 400;
  letter-spacing: .18em; text-transform: uppercase; color: var(--ink-3);
  border-bottom-color: var(--hair-2); white-space: nowrap;
}
.tbl td { color: var(--ink-2); }
.tbl td:first-child { color: var(--ink); font-weight: 500; }
.tbl tbody tr { transition: background-color var(--d-fast) var(--e-out); }
.tbl tbody tr:hover td { background: var(--paper-2); }
.tbl .yes { color: var(--ink-3); }

/* 徽标 */
.tag {
  display: inline-block;
  font-family: var(--mono); font-size: 10px; letter-spacing: .14em;
  text-transform: uppercase;
  padding: 4px 9px; border: 1px solid var(--hair-2); border-radius: 3px;
  color: var(--ink-2); vertical-align: 2px; line-height: 1.4;
}
.tag--live { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); }

/* 邮箱芯片 · 液体玻璃 */
.chip {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 14px 20px; margin: .3em 0;
  border: 1px solid var(--glass-border); border-radius: 999px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
  transition: border-color var(--d-fast) var(--e-out),
              background-color var(--d-fast) var(--e-out),
              transform var(--d-fast) var(--e-out);
}
.chip:hover { border-color: var(--ink); transform: translateY(-1px); }
.chip:active { transform: translateY(0); }
.chip__at {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  color: var(--accent);
}
.chip__mail {
  font-size: clamp(0.9375rem, 1.4vw, 1.0625rem);
  font-weight: 500; letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
}
.chip__tail {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-3);
  min-width: 62px; justify-content: flex-end;
}
.chip__tail svg { width: 12px; height: 12px; opacity: 0; transform: scale(.5); transition: all var(--d-mid) var(--e-out); }
.chip.done { border-color: var(--accent); }
.chip.done .chip__tail { color: var(--accent); }
.chip.done .chip__tail svg { opacity: 1; transform: none; }
.chip.done .chip__tail b { font-weight: 400; }
.chip.done.is-anim svg { animation: pop var(--d-mid) var(--e-out); }
@keyframes pop { 0% { transform: scale(.2) rotate(-30deg); } 100% { transform: none; } }

/* 手风琴 */
.qa { border-top: 1px solid var(--hair); }
.qa__item { border-bottom: 1px solid var(--hair); }
.qa__q {
  width: 100%; display: grid; grid-template-columns: 1fr 22px;
  gap: 18px; align-items: start; text-align: left;
  padding: 20px 0;
  font-size: var(--t-h3); font-weight: 500; line-height: 1.5;
  letter-spacing: -.012em; color: var(--ink);
  transition: color var(--d-fast) var(--e-out);
}
.qa__q:hover { color: var(--accent); }
.qa__sign {
  position: relative; width: 13px; height: 13px; margin-top: .38em;
  justify-self: end;
}
.qa__sign::before, .qa__sign::after {
  content: ""; position: absolute; background: currentColor;
  transition: transform var(--d-mid) var(--e-out), background-color var(--d-fast) var(--e-out);
}
.qa__sign::before { left: 0; top: 6px; width: 13px; height: 1px; }
.qa__sign::after  { left: 6px; top: 0; width: 1px; height: 13px; }
.qa__item.open .qa__sign::after { transform: scaleY(0); }
.qa__item.open .qa__q { color: var(--accent); }

.qa__a {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows var(--d-mid) var(--e-out);
}
.qa__item.open .qa__a { grid-template-rows: 1fr; }
.qa__a > div { overflow: hidden; min-height: 0; }
.qa__a p { padding: 0 42px 22px 0; color: var(--ink-2); }
.qa__a p:first-child { margin-top: -4px; }
.qa__a p:last-child { padding-bottom: 24px; }

/* 索引首页卡片 */
.cards { display: grid; gap: 0; border-top: 1px solid var(--hair); }
.card-link {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: clamp(16px, 3vw, 40px);
  align-items: center;
  padding: clamp(26px, 4vw, 40px) 0;
  border-bottom: 1px solid var(--hair);
  transition: background-color var(--d-fast) var(--e-out), padding-inline var(--d-mid) var(--e-out);
}
.card-link:hover { background: var(--paper-2); padding-inline: clamp(12px, 2vw, 24px); }
.card-link__n {
  font-family: var(--mono); font-size: 11px; letter-spacing: .18em;
  color: var(--ink-4); font-variant-numeric: tabular-nums;
  transition: color var(--d-fast) var(--e-out);
}
.card-link:hover .card-link__n { color: var(--accent); }
.card-link__t {
  font-size: clamp(1.375rem, 3.4vw, 2.25rem);
  font-weight: 600; line-height: 1.18; letter-spacing: -.035em;
  margin: 0 0 8px;
}
.card-link__d { margin: 0; font-size: var(--t-small); color: var(--ink-2); max-width: 48ch; }
.card-link__meta {
  margin: 10px 0 0; font-family: var(--mono); font-size: 10px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-4);
}
.card-link__go {
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--hair-2);
  display: grid; place-items: center; color: var(--ink-2);
  transition: all var(--d-mid) var(--e-out);
}
.card-link:hover .card-link__go {
  background: var(--ink); color: var(--paper); border-color: var(--ink);
  transform: rotate(-45deg);
}
.card-link__go svg { width: 15px; height: 15px; }

/* 返回顶部 · 液体玻璃 */
.totop {
  position: fixed; right: clamp(16px, 3vw, 34px); bottom: clamp(16px, 3vw, 34px);
  z-index: 40;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--glass-bg-strong); color: var(--ink);
  display: grid; place-items: center;
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-shadow);
  opacity: 0; pointer-events: none;
  transform: translateY(10px) scale(.9);
  transition: all var(--d-mid) var(--e-out);
}
.totop.on { opacity: 1; pointer-events: auto; transform: none; }
.totop:hover { transform: translateY(-3px); }
.totop svg { width: 14px; height: 14px; }

/* --------------------------------------------------------------------------
   9. 页脚
   -------------------------------------------------------------------------- */
.foot {
  margin-top: clamp(60px, 8vw, 110px);
  padding-top: 26px; border-top: 1px solid var(--hair);
  display: flex; flex-wrap: wrap; gap: 16px 34px; align-items: baseline;
  font-family: var(--mono); font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-4);
}
.foot nav { display: flex; flex-wrap: wrap; gap: 22px; margin-left: auto; }
.foot a { color: var(--ink-3); transition: color var(--d-fast) var(--e-out); }
.foot a:hover { color: var(--accent); }

/* --------------------------------------------------------------------------
   10. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .grids { display: none; }
}

@media (max-width: 920px) {
  :root { --topbar: 57px; }
  .doc { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .index {
    position: fixed; inset: var(--topbar) 0 auto 0; z-index: 45;
    max-height: calc(100dvh - var(--topbar));
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--paper);
    border-bottom: 1px solid var(--hair);
    padding: 22px var(--gutter) 26px;
    transform: translateY(-102%);
    transition: transform var(--d-mid) var(--e-out);
    box-shadow: 0 24px 40px -32px rgba(0, 0, 0, .5);
  }
  .index__label { display: none; }
  .index__pages {
    display: flex; flex-wrap: wrap; gap: 8px;
    margin-bottom: 18px; padding-bottom: 18px;
    border-bottom: 1px solid var(--hair);
  }
  .index__pages a {
    font-family: var(--mono); font-size: 11px;
    letter-spacing: .14em; text-transform: uppercase;
    padding: 9px 15px; border: 1px solid var(--hair-2);
    border-radius: 999px; color: var(--ink-2);
  }
  .index__pages a[aria-current="page"] {
    background: var(--ink); border-color: var(--ink); color: var(--paper);
  }
  .meter { display: none; }
  .index ol { max-height: none; }
  .index li a { padding: 9px 0 9px 14px; font-size: 0.9375rem; }
  .index__foot { display: none; }
  body.nav-open .index { transform: none; }
  :root.js .navtoggle { display: grid; }
  .page-home .navtoggle, :root.js .page-home .navtoggle { display: none; }
  .nav { flex-wrap: wrap; }
  .nav a { padding: 6px 8px; font-size: 0.8125rem; }
  :root.js .nav { display: none; }
  .brand__name span { display: none; }
  .factbar div { padding-right: 18px; margin-right: 18px; }
}

@media (max-width: 620px) {
  .prose { max-width: none; }
  .sect h2 { grid-template-columns: 1fr; gap: 4px; }
  .sect h2 b { padding-top: 0; }
  .factbar { flex-direction: column; }
  .factbar div { border-right: 0; border-bottom: 1px solid var(--hair); padding: 14px 0; margin: 0; }
  .factbar div:last-child { border-bottom: 0; }
  .card-link { grid-template-columns: 40px minmax(0, 1fr); row-gap: 10px; }
  .card-link__go { display: none; }
  .panel { padding: 20px; }
  .lead { padding-left: 18px; }
  .chip { width: 100%; justify-content: space-between; padding: 14px 18px; }
  .tbl th, .tbl td { padding-right: 12px; }
  .tbl { font-size: 0.8125rem; }
  .tblwrap { overflow-x: auto; margin-right: calc(var(--gutter) * -1); padding-right: var(--gutter); }
}

/* --------------------------------------------------------------------------
   11. 动效降级与打印
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .rv { opacity: 1 !important; transform: none !important; }
}

@media print {
  .topbar, .progress, .grids, .index, .totop, .skip { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .shell { max-width: none; padding: 0; }
  .doc { display: block; }
  .qa__a { grid-template-rows: 1fr !important; }
  .rv { opacity: 1 !important; transform: none !important; }
  .sect { break-inside: avoid; }
  a { text-decoration: underline; }
}

/* --------------------------------------------------------------------------
   12. 法律页 · 简洁阅读版式（2026-10-02）
   --------------------------------------------------------------------------
   用户口径：「那三枚入口（隐私政策 / 用户协议 / 支持）里的内容重新排版，简洁一点」。
   只作用于 `body.page-legal` 的三篇文档页：
     · 去掉装饰网格（.grids）、顶部进度条（.progress）、侧栏目录（.index）；
     · 收成单栏正文（.doc 由「侧栏 + 正文」栅格改为 block），行宽舒适；
     · 首屏（.hero）瘦身：隐藏营销眉标与副题，标题降级为文档级标题，保留事实条
       （版本 / 生效日期 / 隐私标签 —— 法律页的有效信息）；
     · 顶栏与页脚保留（站内导航与版权需要）。
   ⛔ 不改任何文本；主题（明/暗）仍由站点自身的令牌控制。
   -------------------------------------------------------------------------- */
body.page-legal .grids,
body.page-legal .progress,
body.page-legal .index { display: none !important; }

body.page-legal .shell {
  max-width: 760px;
  padding: 0 clamp(20px, 5vw, 40px) calc(var(--u) * 10);
}

body.page-legal .doc { display: block; }

body.page-legal .hero { padding: clamp(30px, 5vw, 52px) 0 clamp(16px, 2.4vw, 24px); }
body.page-legal .hero .eyebrow { display: none; }
body.page-legal .hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -.02em;
}
body.page-legal .hero__lede { display: none; }
body.page-legal .factbar { margin-top: clamp(20px, 3vw, 28px); }

body.page-legal main { padding: clamp(8px, 1.6vw, 18px) 0 0; }

body.page-legal main .sect {
  max-width: none;
  gap: .9em;
  padding: clamp(30px, 4.5vw, 44px) 0;
  border-top: 1px solid var(--hair);
}
body.page-legal main .sect:first-of-type { border-top: 0; padding-top: 6px; }

body.page-legal .sect h2 {
  display: block;
  margin: 0 0 .55em;
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
}
body.page-legal .sect h2 b {
  display: block;
  padding-top: 0;
  margin-bottom: 6px;
}