/* ==========================================================================
   BEPLAY 账户中心 · 共享样式表 /assets/site.css
   深墨蓝暗场 · 电光青锚点 · 有机色块 · 侧边轨道导航
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#061726;
  --surface:#0D2337;
  --surface-deep:#0B3A44;
  --cyan:#1FE3D2;
  --coral:#FF6B4A;
  --violet:#A99BFF;
  --mint:#6FE3A5;
  --amber:#FFC46B;
  --text:#F2F7FB;
  --text-soft:#D5E2EE;
  --muted:#8FA6BA;
  --border:#1E3B55;

  --rail-w:96px;
  --radius:20px;
  --radius-sm:14px;
  --maxw:1320px;
  --maxw-text:72ch;

  --font-display:"HarmonyOS Sans SC","PingFang SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-text:"PingFang SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.85,.32,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}

html{
  background:var(--ink);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100%;
  font-family:var(--font-text);
  font-size:17px;
  line-height:1.75;
  color:var(--text);
  letter-spacing:.01em;
  background-color:var(--ink);
  background-image:
    radial-gradient(680px 540px at 84% -6%,rgba(31,227,210,.15),transparent 68%),
    radial-gradient(560px 500px at 4% 92%,rgba(169,155,255,.12),transparent 70%),
    radial-gradient(460px 400px at 98% 74%,rgba(255,107,74,.10),transparent 72%),
    linear-gradient(180deg,rgba(11,58,68,.28),rgba(6,23,38,0) 40%);
  background-attachment:fixed;
  overflow-wrap:break-word;
}

body[data-nav-open="true"]{overflow:hidden;}

img,picture,svg,video{display:block;max-width:100%;}
a{color:inherit;background:transparent;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
p{margin:0;}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:400;line-height:1.25;}
hr{margin:0;border:0;}
table{border-collapse:collapse;width:100%;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
  border-radius:4px;
}
:focus:not(:focus-visible){outline:none;}

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

.mono{font-family:var(--font-mono);letter-spacing:.02em;font-variant-numeric:tabular-nums;}
.divider{height:1px;background:var(--border);border:0;margin:0;}

/* ---------- 3. 容器与网格 ---------- */
.shell{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 20px;
}

.layout{display:grid;gap:36px;}
.grid{display:grid;gap:22px;}
.grid--2,.grid--3{grid-template-columns:1fr;}

@media (min-width:768px){
  .grid{gap:24px;}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .shell{padding:0 32px;}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
  .layout{grid-template-columns:minmax(0,7.5fr) minmax(0,2.5fr);gap:48px;}
  .layout--reverse{grid-template-columns:minmax(0,2.6fr) minmax(0,7.4fr);}
  .shell{padding:0 40px;}
}
@media (min-width:1280px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:14px;top:-90px;
  z-index:300;
  padding:11px 18px;
  border-radius:999px;
  background:var(--cyan);
  color:#04121C;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px;}

/* ---------- 5. 移动端顶栏 ---------- */
.site-header{position:relative;z-index:40;}

.topbar{
  position:sticky;
  top:0;
  z-index:50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:12px 20px;
  background:linear-gradient(180deg,rgba(13,35,55,.97),rgba(6,23,38,.9));
  border-bottom:1px solid var(--border);
  backdrop-filter:blur(10px);
}
.topbar__brand{
  display:flex;align-items:center;gap:10px;
  min-width:0;text-decoration:none;
}
.topbar__mark{
  display:grid;place-items:center;
  flex:0 0 auto;
  width:34px;height:34px;
  border:1px solid rgba(31,227,210,.45);
  border-radius:11px;
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  background:radial-gradient(circle at 30% 22%,rgba(31,227,210,.26),transparent 72%);
}
.topbar__name{
  font-size:14px;
  letter-spacing:.02em;
  color:var(--text);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.topbar__toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 15px;
  border:1px solid var(--border);
  border-radius:999px;
  color:var(--text);
  font-size:13px;
  letter-spacing:.04em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
}
.topbar__toggle:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(31,227,210,.06);}
.topbar__toggle-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;}
.topbar__toggle-bars{position:relative;display:block;width:14px;height:8px;flex:0 0 auto;}
.topbar__toggle-bars::before,
.topbar__toggle-bars::after{
  content:"";
  position:absolute;left:0;
  width:14px;height:1.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform .24s var(--ease),top .24s var(--ease);
}
.topbar__toggle-bars::before{top:0;}
.topbar__toggle-bars::after{top:6px;}
.topbar__toggle[aria-expanded="true"] .topbar__toggle-bars::before{top:3px;transform:rotate(45deg);}
.topbar__toggle[aria-expanded="true"] .topbar__toggle-bars::after{top:3px;transform:rotate(-45deg);}

/* ---------- 6. 桌面端侧边轨道 ---------- */
.rail{display:none;}

@media (min-width:1024px){
  .topbar{display:none;}

  .rail{
    display:flex;
    flex-direction:column;
    align-items:center;
    position:fixed;
    left:0;top:0;bottom:0;
    width:var(--rail-w);
    z-index:40;
    padding:22px 0 20px;
    background:linear-gradient(180deg,#0D2337 0%,#0B3A44 58%,#061726 100%);
    border-right:1px solid var(--border);
  }
  .rail::after{
    content:"";
    position:absolute;
    top:0;right:-1px;
    width:1px;height:34%;
    background:linear-gradient(180deg,var(--cyan),rgba(31,227,210,0));
    pointer-events:none;
  }

  .rail__brand{
    display:grid;place-items:center;
    flex:0 0 auto;
    width:46px;height:46px;
    border:1px solid var(--border);
    border-radius:var(--radius-sm);
    color:var(--cyan);
    font-family:var(--font-mono);
    font-size:14px;
    letter-spacing:.04em;
    text-decoration:none;
    background:radial-gradient(circle at 30% 20%,rgba(31,227,210,.34),transparent 70%);
    transition:border-color .22s var(--ease),transform .22s var(--ease);
  }
  .rail__brand:hover{border-color:var(--cyan);transform:translateY(-2px);}

  .rail__nav{
    width:100%;
    flex:1 1 auto;
    margin-top:20px;
    overflow-y:auto;
    overflow-x:hidden;
    scrollbar-width:thin;
    scrollbar-color:var(--border) transparent;
  }
  .rail__nav::-webkit-scrollbar{width:4px;}
  .rail__nav::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px;}

  .rail__list{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:2px;
  }
  .rail__item{width:100%;display:flex;justify-content:center;}

  .rail__link{
    position:relative;
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:8px;
    padding:10px 8px;
    border-radius:var(--radius-sm);
    color:var(--muted);
    text-decoration:none;
    transition:color .22s var(--ease),background-color .22s var(--ease);
  }
  .rail__link::before{
    content:"";
    position:absolute;
    left:-2px;top:50%;
    width:2px;height:0;
    border-radius:2px;
    background:var(--cyan);
    transform:translateY(-50%);
    transition:height .24s var(--ease);
  }
  .rail__num{
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.14em;
    opacity:.75;
  }
  .rail__label{
    writing-mode:vertical-rl;
    font-size:12.5px;
    letter-spacing:.16em;
    line-height:1;
    white-space:nowrap;
  }
  .rail__link:hover,
  .rail__link:focus-visible{
    color:var(--text);
    background:rgba(31,227,210,.07);
  }
  .rail__link[aria-current="page"]{color:var(--cyan);}
  .rail__link[aria-current="page"]::before{height:26px;}

  .rail__foot{
    margin-top:auto;
    width:100%;
    padding-top:16px;
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:14px;
  }
  .rail__cta{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:60px;
    padding:15px 0;
    border-radius:16px;
    background:var(--cyan);
    color:#04121C;
    text-decoration:none;
    transition:transform .22s var(--ease),box-shadow .22s var(--ease);
  }
  .rail__cta-text{
    writing-mode:vertical-rl;
    font-size:12px;
    letter-spacing:.18em;
    line-height:1;
    font-weight:600;
  }
  .rail__cta:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(31,227,210,.3);}

  .rail__utility{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:4px;
  }
  .rail__util-link{
    font-size:12px;
    color:var(--muted);
    text-decoration:none;
    padding:5px 9px;
    border-radius:8px;
    transition:color .2s var(--ease),background-color .2s var(--ease);
  }
  .rail__util-link:hover{color:var(--cyan);background:rgba(31,227,210,.08);}

  .rail__progress{
    position:absolute;
    right:-1px;bottom:0;
    width:2px;height:0;
    background:linear-gradient(180deg,var(--cyan),rgba(31,227,210,.08));
    transition:height .12s linear;
    pointer-events:none;
  }
}

/* ---------- 7. 移动端抽屉 ---------- */
.drawer{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  max-height:84vh;
  overflow-y:auto;
  padding:14px 20px calc(24px + env(safe-area-inset-bottom,0px));
  background:linear-gradient(180deg,#0D2337,#061726 72%);
  border-top:1px solid var(--cyan);
  border-radius:24px 24px 0 0;
  box-shadow:0 -30px 70px rgba(0,0,0,.55);
  transform:translateY(101%);
  visibility:hidden;
  transition:transform .3s var(--ease),visibility .3s var(--ease);
}
.drawer[data-open="true"]{transform:translateY(0);visibility:visible;}

.drawer__handle{
  width:44px;height:4px;
  margin:0 auto 18px;
  border-radius:4px;
  background:var(--border);
}
.drawer__list{display:grid;gap:6px;}

.drawer__link{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:13px 16px;
  border:1px solid transparent;
  border-radius:16px;
  color:var(--muted);
  text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.drawer__link:hover,
.drawer__link:focus-visible{color:var(--text);background:rgba(31,227,210,.06);}
.drawer__link[aria-current="page"]{
  color:var(--cyan);
  border-color:rgba(31,227,210,.42);
  background:rgba(31,227,210,.08);
}
.drawer__num{
  min-width:22px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:inherit;
  opacity:.7;
}
.drawer__label{font-size:16px;letter-spacing:.02em;}

.drawer__cta{margin-top:18px;}
.drawer__utility{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px;}
.drawer__util-link{
  padding:8px 15px;
  border:1px solid var(--border);
  border-radius:999px;
  color:var(--muted);
  font-size:13px;
  text-decoration:none;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.drawer__util-link:hover{color:var(--cyan);border-color:var(--cyan);}

.drawer-scrim{
  position:fixed;
  inset:0;
  z-index:59;
  background:rgba(3,12,20,.62);
  opacity:0;
  visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s var(--ease);
}
.drawer-scrim[data-open="true"]{opacity:1;visibility:visible;}

@media (min-width:1024px){
  .drawer,
  .drawer-scrim{display:none;}
}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14.5px;
  letter-spacing:.02em;
  text-decoration:none;
  text-align:center;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),
             background-color .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease);
}
.btn--primary{background:var(--cyan);color:#04121C;font-weight:600;}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(31,227,210,.3);}
.btn--ghost{
  border-color:var(--border);
  background:rgba(13,35,55,.6);
  color:var(--text);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px);}
.btn--coral{background:var(--coral);color:#190802;font-weight:600;}
.btn--coral:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(255,107,74,.32);}
.btn--block{width:100%;}

/* ---------- 9. 面包屑与正文 ---------- */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:22px 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumbs__link{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumbs__link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.breadcrumbs__sep{color:var(--border);}
.breadcrumbs__current{color:var(--text);}

.prose{
  max-width:var(--maxw-text);
  font-size:16.5px;
  line-height:1.8;
  color:var(--text-soft);
}
.prose > * + *{margin-top:1.15em;}
.prose h2{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,32px);
  font-weight:600;
  color:var(--text);
  letter-spacing:.01em;
}
.prose h3{font-size:19px;font-weight:600;color:var(--text);}
.prose ul{display:grid;gap:.6em;}
.prose ul li{position:relative;padding-left:20px;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.75em;
  width:9px;height:1.5px;
  border-radius:2px;
  background:var(--cyan);
}
.prose strong{color:var(--text);font-weight:600;}
.prose a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(31,227,210,.35);
  transition:border-color .2s var(--ease);
}
.prose a:hover{border-bottom-color:var(--cyan);}

/* ---------- 10. 章节骨架 ---------- */
.section{padding:72px 0;}
.section__head{display:grid;gap:14px;margin-bottom:40px;max-width:62ch;}
.section__index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--muted);
}
.section__title{
  font-family:var(--font-display);
  font-size:clamp(30px,4.6vw,46px);
  font-weight:500;
  line-height:1.2;
  letter-spacing:.01em;
  color:var(--text);
}
.section__lead{font-size:16px;line-height:1.8;color:var(--muted);}

/* ---------- 11. 卡片 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:26px 24px 24px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:linear-gradient(160deg,rgba(13,35,55,.92),rgba(6,23,38,.85));
  color:inherit;
  text-decoration:none;
  transition:border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  left:24px;right:24px;top:-1px;
  height:2px;
  border-radius:2px;
  background:var(--border);
  transition:background-color .24s var(--ease);
}
.card:hover,
.card:focus-visible{
  transform:translateY(-4px);
  border-color:rgba(31,227,210,.55);
  box-shadow:0 20px 44px rgba(3,14,24,.6);
}
.card:hover::before,
.card:focus-visible::before{background:var(--cyan);}
.card--query::before{background:var(--violet);}
.card--profile::before{background:var(--mint);}

.card__top{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.card__index{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--muted);
}
.card__title{font-size:21px;font-weight:600;line-height:1.4;color:var(--text);}
.card__text{font-size:14.5px;line-height:1.75;color:var(--muted);}
.card__foot{
  margin-top:auto;
  padding-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
}

/* ---------- 12. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 12px;
  border:1px solid var(--border);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
  white-space:nowrap;
}
.tag::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:currentColor;
  flex:0 0 auto;
}
.tag--query{color:var(--violet);border-color:rgba(169,155,255,.42);background:rgba(169,155,255,.08);}
.tag--profile{color:var(--mint);border-color:rgba(111,227,165,.42);background:rgba(111,227,165,.08);}
.tag--notice{color:var(--amber);border-color:rgba(255,196,107,.42);background:rgba(255,196,107,.08);}
.tag--live{color:var(--coral);border-color:rgba(255,107,74,.42);background:rgba(255,107,74,.08);}

/* ---------- 13. 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16/10;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:
    radial-gradient(circle at 24% 16%,rgba(31,227,210,.18),transparent 62%),
    linear-gradient(150deg,#0D2337,#061726 74%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.45;
  background-image:
    linear-gradient(rgba(31,227,210,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(31,227,210,.08) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(circle at 58% 42%,#000,transparent 78%);
  mask-image:radial-gradient(circle at 58% 42%,#000,transparent 78%);
}
.media-frame > img,
.media-frame > picture > img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__caption{
  position:absolute;
  left:18px;right:18px;bottom:16px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--wide{aspect-ratio:21/9;}

/* ---------- 14. 数据刻度 ---------- */
.stat{display:grid;gap:6px;}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(30px,4vw,42px);
  font-weight:500;
  line-height:1;
  letter-spacing:-.01em;
  color:var(--text);
  font-variant-numeric:tabular-nums;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--muted);
}

/* ---------- 15. 折叠分组 ---------- */
.accordion{display:grid;gap:10px;}
.accordion__item{
  border:1px solid var(--border);
  border-radius:16px;
  background:rgba(13,35,55,.55);
  overflow:hidden;
  transition:border-color .24s var(--ease);
}
.accordion__item:hover{border-color:rgba(31,227,210,.36);}
.accordion__item[data-open="true"]{border-color:rgba(31,227,210,.5);}

.accordion__trigger{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:18px 20px;
  text-align:left;
  font-size:16px;
  color:var(--text);
  transition:color .2s var(--ease);
}
.accordion__trigger::after{
  content:"";
  flex:0 0 auto;
  width:9px;height:9px;
  margin-left:auto;
  border-right:1.5px solid var(--cyan);
  border-bottom:1.5px solid var(--cyan);
  transform:rotate(45deg);
  transition:transform .24s var(--ease);
}
.accordion__trigger[aria-expanded="true"]::after{transform:rotate(-135deg);}

.accordion__panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .24s var(--ease);
}
.accordion__item[data-open="true"] .accordion__panel{grid-template-rows:1fr;}
.accordion__panel > *{overflow:hidden;}
.accordion__panel-inner{
  padding:0 20px 20px;
  font-size:15px;
  line-height:1.8;
  color:var(--muted);
}

/* ---------- 16. 显现状态 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 17. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:120px;
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,rgba(11,58,68,.36),rgba(6,23,38,.92) 44%,#04101A);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:220px;height:1px;
  background:var(--cyan);
}
.footer__inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:64px 20px 34px;
}
.footer__grid{
  display:grid;
  gap:40px 32px;
  grid-template-columns:1fr;
}

.footer__identity{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:12px;
}
.footer__mark{
  display:grid;place-items:center;
  width:44px;height:44px;
  border:1px solid rgba(31,227,210,.42);
  border-radius:var(--radius-sm);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  background:radial-gradient(circle at 30% 20%,rgba(31,227,210,.24),transparent 72%);
}
.footer__brand{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--text);
}
.footer__tagline{
  max-width:26ch;
  font-size:13.5px;
  line-height:1.7;
  color:var(--muted);
}
.footer__badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  border:1px solid rgba(255,196,107,.36);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--amber);
}
.footer__badge-dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--amber);
  flex:0 0 auto;
}

.footer__col-title{
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--muted);
}
.footer__links{display:grid;gap:10px;}
.footer__link{
  position:relative;
  display:inline-block;
  padding-bottom:3px;
  font-size:14.5px;
  color:var(--text);
  text-decoration:none;
  transition:color .22s var(--ease);
}
.footer__link::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:100%;height:1px;
  background:currentColor;
  opacity:.6;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .26s var(--ease);
}
.footer__link:hover{color:var(--cyan);}
.footer__link:hover::after{transform:scaleX(1);}

.footer__meta{display:grid;gap:12px;}
.footer__meta-item{display:grid;gap:2px;}
.footer__meta-key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.footer__meta-val{
  font-size:14px;
  color:var(--text);
  overflow-wrap:anywhere;
}
.footer__meta-val--mono{
  font-family:var(--font-mono);
  font-size:13.5px;
  letter-spacing:.01em;
}
.footer__note{
  margin-top:14px;
  max-width:34ch;
  font-size:12.5px;
  line-height:1.7;
  color:var(--muted);
}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:56px;
  padding-top:22px;
  border-top:1px solid var(--border);
}
.footer__legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--muted);
}
.footer__copy{font-size:12.5px;color:var(--muted);}

@media (min-width:600px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer__inner{padding:72px 32px 36px;}
}
@media (min-width:1024px){
  .footer__grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .footer__inner{padding:80px 40px 40px;}
}
@media (min-width:1200px){
  .footer__grid{grid-template-columns:1.4fr .7fr .7fr .7fr 1.5fr;gap:40px 28px;}
}

/* ---------- 18. 回到顶部 ---------- */
.to-top{
  position:fixed;
  right:20px;
  bottom:calc(20px + env(safe-area-inset-bottom,0px));
  z-index:55;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 17px;
  border:1px solid var(--border);
  border-radius:999px;
  background:rgba(13,35,55,.94);
  color:var(--muted);
  font-size:12.5px;
  letter-spacing:.04em;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease),
             border-color .2s var(--ease),color .2s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none;}
.to-top:hover{border-color:var(--cyan);color:var(--cyan);}
.to-top__arrow{font-family:var(--font-mono);font-size:13px;}

@media (min-width:1024px){
  .to-top{right:28px;bottom:28px;}
}

/* ---------- 19. 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none;}
  .card:hover,
  .card:focus-visible{transform:none;}
  .btn:hover{transform:none;}
}