/* ==========================================================================
   YOBO赛场 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 按钮 / 网格 / 基础组件
   ========================================================================== */

:root{
  --bg:#07130F;
  --panel:#0E2019;
  --line:#1C3A31;
  --cyan:#35F2C0;
  --cyan-soft:#A6FFE6;
  --flame:#FF5A2B;
  --amber:#FFA06B;
  --muted:#7E9A92;
  --ink:#EAF7F2;
  --score:#0FA37F;

  --shell:1220px;
  --pad:clamp(16px,4vw,40px);
  --radius:6px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:280ms;
  --shadow:6px 6px 0 rgba(3,10,8,.72);
  --hairline:1px solid var(--line);

  --font-sans:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-narrow:"Archivo Narrow","Oswald","Inter","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","Roboto Mono",SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  background:var(--bg);
  scroll-padding-top:120px;
}
body{
  margin:0;
  background:transparent;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.8;
  letter-spacing:.012em;
  overflow-x:hidden;
  padding-top:clamp(78px,9vw,106px);
}
body::before{
  content:"";
  position:fixed;
  inset:-22vh -22vw;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(53,242,192,.075) 0 1px,transparent 1px 100%),
    linear-gradient(0deg,rgba(53,242,192,.055) 0 1px,transparent 1px 100%);
  background-size:38px 38px,38px 38px;
  animation:gridDrift 46s linear infinite;
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(58vw 42vh at 10% -6%,rgba(53,242,192,.11),transparent 70%),
    radial-gradient(48vw 34vh at 94% 6%,rgba(255,90,43,.09),transparent 72%),
    radial-gradient(70vw 50vh at 50% 108%,rgba(15,163,127,.10),transparent 70%);
}
@keyframes gridDrift{to{transform:translate3d(76px,76px,0);}}

img,svg{max-width:100%;}
img{display:block;height:auto;}
a{color:var(--cyan);text-decoration:none;}
a:hover{color:var(--cyan-soft);}
button{font:inherit;color:inherit;background:none;border:0;}
ul,ol{margin:0;padding:0;list-style:none;}
figure,blockquote{margin:0;}
hr{border:0;border-top:var(--hairline);margin:0;}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-narrow);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.015em;
  text-wrap:balance;
}
p{margin:0 0 1em;text-wrap:pretty;}
p:last-child{margin-bottom:0;}
b,strong{font-weight:700;}

:focus-visible{
  outline:3px solid var(--cyan-soft);
  outline-offset:3px;
  border-radius:4px;
}

.mono{
  font-family:var(--font-mono);
  font-size:.86em;
  letter-spacing:0;
}
.data-num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}
.label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.5;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--cyan-soft);
  background:rgba(53,242,192,.12);
  border:1px solid rgba(53,242,192,.32);
  border-radius:4px;
  padding:3px 8px;
}
.note{
  font-size:13.5px;
  line-height:1.7;
  color:var(--muted);
}
.annotation{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
  text-transform:uppercase;
}
.divider{
  height:3px;
  border:0;
  background:linear-gradient(90deg,var(--cyan) 0 18%,var(--line) 18% 100%);
}

/* ---------- 容器与网格 ---------- */
.container{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--pad);
}
.container--narrow{max-width:780px;}
.section{
  position:relative;
  z-index:1;
  padding:clamp(44px,7vw,88px) 0;
}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:clamp(14px,3vw,40px);
  margin-bottom:clamp(20px,3vw,36px);
}
.section__index{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--cyan);
}
.section__index::before{
  content:"";
  width:22px;
  height:3px;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(53,242,192,.7);
}
.section__title{font-size:clamp(28px,4.4vw,54px);}
.section__note{
  max-width:36ch;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  letter-spacing:.06em;
  color:var(--muted);
}
.stack{display:grid;gap:clamp(14px,2vw,22px);}
.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.span-4{grid-column:span 4;}
.span-5{grid-column:span 5;}
.span-6{grid-column:span 6;}
.span-7{grid-column:span 7;}
.span-8{grid-column:span 8;}
.span-9{grid-column:span 9;}
.span-12{grid-column:span 12;}

/* ---------- 面板 / 卡片 ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(14,32,25,.94),rgba(8,20,16,.94));
  border:3px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,3vw,34px);
  box-shadow:var(--shadow);
}
.panel__head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:16px;
}
.panel__body{position:relative;}
.panel--cut{
  clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%);
}
.card{
  background:var(--panel);
  border:3px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(16px,2.4vw,26px);
}
.card--glass{
  background:rgba(14,32,25,.6);
  border-color:rgba(53,242,192,.34);
  border-radius:10px;
  box-shadow:0 24px 56px -28px rgba(0,0,0,.95);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

/* ---------- 数据组件 ---------- */
.stat{display:grid;gap:6px;}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(30px,5vw,54px);
  line-height:1;
  letter-spacing:-.03em;
  color:var(--cyan);
  text-shadow:0 0 26px rgba(53,242,192,.28);
}
.stat__unit{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--muted);
  margin-left:6px;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--muted);
}

/* ---------- 标签 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px;}
.tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  padding:4px 9px;
  border-radius:4px;
  border:1px solid var(--line);
  color:var(--muted);
  background:rgba(28,58,49,.4);
}
.tag--cyan{
  color:#04120D;
  background:var(--cyan-soft);
  border-color:var(--cyan);
}
.tag--flame{
  color:#1A0700;
  background:var(--flame);
  border-color:var(--amber);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--font-narrow);
  font-weight:700;
  font-size:14px;
  letter-spacing:.05em;
  padding:10px 18px;
  border-radius:999px;
  border:2px solid var(--cyan);
  color:var(--cyan);
  background:transparent;
  cursor:pointer;
  white-space:nowrap;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{
  background:rgba(53,242,192,.14);
  color:var(--cyan-soft);
  box-shadow:0 0 0 4px rgba(53,242,192,.14);
}
.btn:active{transform:translateY(1px);}
.btn--cyan{
  background:var(--cyan);
  color:#04120D;
  border-color:var(--cyan);
  box-shadow:0 0 22px -6px rgba(53,242,192,.8);
}
.btn--cyan:hover{
  background:var(--cyan-soft);
  color:#04120D;
  box-shadow:0 0 30px -4px rgba(53,242,192,.9);
}
.btn--ghost{
  border-color:var(--line);
  color:var(--ink);
}
.btn--ghost:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  background:rgba(53,242,192,.08);
}
.btn--flame{
  border-color:var(--flame);
  color:var(--flame);
}
.btn--flame:hover{
  background:var(--flame);
  color:#1A0700;
  box-shadow:0 0 0 4px rgba(255,90,43,.18);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb__link{
  color:var(--muted);
  transition:color var(--dur) var(--ease);
}
.breadcrumb__link:hover{color:var(--cyan);}
.breadcrumb__link[aria-current="page"]{color:var(--cyan-soft);}
.breadcrumb__sep{color:var(--line);}

/* ---------- 标签页 / 手风琴 / 目录 ---------- */
.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:18px;
}
.tabs__btn{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  padding:9px 15px;
  border-radius:999px;
  border:2px solid var(--line);
  color:var(--muted);
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.tabs__btn:hover{color:var(--cyan-soft);border-color:rgba(53,242,192,.45);}
.tabs__btn[aria-selected="true"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04120D;
  font-weight:700;
}
.tabs__panel[hidden]{display:none;}
.tabs__panel[data-active]{animation:panelIn var(--dur) var(--ease);}
@keyframes panelIn{
  from{opacity:0;transform:translateX(16px);}
  to{opacity:1;transform:none;}
}

.accordion{
  border:3px solid var(--line);
  border-radius:var(--radius);
  background:rgba(14,32,25,.6);
  overflow:hidden;
}
.accordion details + details{border-top:var(--hairline);}
.accordion summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:16px 18px;
  cursor:pointer;
  font-weight:600;
  list-style:none;
}
.accordion summary::-webkit-details-marker{display:none;}
.accordion summary::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--cyan);
  line-height:1;
}
.accordion details[open] summary::after{content:"–";}
.accordion details[open] summary{color:var(--cyan-soft);}

.toc{
  position:sticky;
  top:118px;
  display:grid;
  gap:2px;
  border-left:3px solid var(--line);
  padding-left:14px;
}
.toc__link{
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
  padding:5px 0;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.toc__link:hover{color:var(--cyan-soft);transform:translateX(3px);}
.toc__link[aria-current]{color:var(--cyan);font-weight:700;}

/* ---------- 媒体容器（页面阶段放图） ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/9;
  border:3px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(135deg,#0E2019 0%,#07130F 62%);
  box-shadow:var(--shadow);
}
.media--wide{aspect-ratio:21/9;}
.media--square{aspect-ratio:1/1;}
.media--portrait{aspect-ratio:3/4;}
.media--diagonal{
  clip-path:polygon(0 0,100% 0,100% 88%,0 100%);
}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.96) contrast(1.06);
}
.media__cap{
  position:absolute;
  left:12px;
  bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ink);
  background:rgba(7,19,15,.78);
  border:1px solid var(--line);
  border-radius:4px;
  padding:4px 8px;
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}

/* ---------- 滚动显现 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 520ms var(--ease),transform 520ms var(--ease);
}
.reveal[data-visible]{opacity:1;transform:none;}

/* ==========================================================================
   头部
   ========================================================================== */
.skip-link{
  position:absolute;
  left:var(--pad);
  top:-70px;
  z-index:120;
  display:inline-block;
  padding:10px 18px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:#04120D;
  background:var(--cyan);
  border-radius:0 0 8px 8px;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:0;color:#04120D;}

.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:90;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--score) 55%,var(--flame) 100%);
  box-shadow:0 0 14px rgba(53,242,192,.55);
  pointer-events:none;
}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:80;
  padding:clamp(10px,1.7vw,20px) var(--pad) 0;
}
.header-island{
  max-width:var(--shell);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
  padding:8px 10px 8px 16px;
  border:3px solid var(--line);
  border-radius:999px;
  background:rgba(11,26,20,.82);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 20px 44px -26px rgba(0,0,0,.95);
  transition:padding var(--dur) var(--ease),background var(--dur) var(--ease),
             border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
[data-scrolled] .header-island{
  padding:6px 8px 6px 14px;
  background:rgba(7,19,15,.94);
  border-color:rgba(53,242,192,.38);
  box-shadow:0 22px 52px -24px rgba(0,0,0,.98),0 0 0 1px rgba(53,242,192,.08);
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  color:var(--ink);
}
.brand:hover{color:var(--ink);}
.brand__mark{
  position:relative;
  width:30px;
  height:30px;
  flex:0 0 auto;
  border:3px solid var(--cyan);
  border-radius:50%;
  display:grid;
  place-items:center;
  box-shadow:0 0 16px -2px rgba(53,242,192,.65);
}
.brand__mark::after{
  content:"";
  width:9px;
  height:9px;
  background:var(--cyan);
  border-radius:2px;
  transform:rotate(45deg);
  box-shadow:0 0 12px var(--cyan);
}
.brand__name{
  font-family:var(--font-narrow);
  font-weight:800;
  font-size:16px;
  letter-spacing:.06em;
  text-transform:uppercase;
  white-space:nowrap;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--cyan);
  background:rgba(53,242,192,.12);
  border:1px solid rgba(53,242,192,.34);
  border-radius:999px;
  padding:2px 7px;
  white-space:nowrap;
}

.nav{margin-left:auto;}
.nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav__link{
  display:block;
  padding:9px 14px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:14px;
  color:#CBE3DB;
  white-space:nowrap;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.nav__link:hover{
  color:var(--cyan-soft);
  background:rgba(53,242,192,.09);
  border-color:rgba(53,242,192,.28);
}
.nav__link[aria-current="page"]{
  color:#04120D;
  background:var(--cyan);
  border-color:var(--cyan);
  font-weight:700;
  box-shadow:0 0 0 3px rgba(53,242,192,.16);
}

.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
}
.header__cta{padding:9px 16px;font-size:13.5px;}

.nav-toggle{
  display:none;
  position:relative;
  width:44px;
  height:40px;
  border:2px solid var(--line);
  border-radius:999px;
  background:rgba(53,242,192,.08);
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:rgba(53,242,192,.5);}
.nav-toggle__bar{
  position:absolute;
  left:50%;
  top:50%;
  width:20px;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle__bar:nth-child(1){transform:translate(-50%,-4px);}
.nav-toggle__bar:nth-child(2){transform:translate(-50%,4px);}
.nav-toggle[data-open]{background:var(--cyan);border-color:var(--cyan);}
.nav-toggle[data-open] .nav-toggle__bar{background:#04120D;}
.nav-toggle[data-open] .nav-toggle__bar:nth-child(1){transform:translate(-50%,0) rotate(45deg);}
.nav-toggle[data-open] .nav-toggle__bar:nth-child(2){transform:translate(-50%,0) rotate(-45deg);}

/* 移动端底部常驻快捷条 */
.quickbar{
  display:none;
  position:fixed;
  left:var(--pad);
  right:var(--pad);
  bottom:max(10px,env(safe-area-inset-bottom,10px));
  z-index:76;
  grid-template-columns:repeat(3,1fr);
  gap:6px;
  padding:6px;
  border:3px solid var(--line);
  border-radius:16px;
  background:rgba(9,22,17,.95);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:0 24px 52px -26px rgba(0,0,0,.95);
}
.quickbar__item{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:3px;
  padding:8px 4px;
  border-radius:10px;
  color:var(--muted);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.quickbar__item:hover,
.quickbar__item:focus-visible{color:var(--cyan);}
.quickbar__item[aria-current="page"]{
  color:#04120D;
  background:var(--cyan);
}
.quickbar__icon{
  width:18px;
  height:18px;
  fill:none;
  stroke:currentColor;
  stroke-width:1.7;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.quickbar__text{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(60px,9vw,120px);
  border-top:3px solid var(--line);
  background:linear-gradient(180deg,rgba(14,32,25,.94) 0%,rgba(7,19,15,1) 62%);
}
.footer-inner{
  max-width:var(--shell);
  margin:0 auto;
  padding:clamp(28px,4vw,52px) var(--pad) clamp(20px,3vw,34px);
}

.footer-track{
  border:3px solid var(--line);
  border-radius:10px;
  padding:clamp(14px,2vw,20px) clamp(14px,2vw,22px);
  background:rgba(7,19,15,.72);
  box-shadow:var(--shadow);
}
.footer-track__head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.footer-track__link{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--cyan);
  border-bottom:1px dashed rgba(53,242,192,.5);
  padding-bottom:1px;
}
.track{
  position:relative;
  height:12px;
  margin:16px 0 12px;
  border-radius:2px;
  overflow:visible;
  background-color:rgba(28,58,49,.6);
  background-image:linear-gradient(90deg,var(--line) 0 1px,transparent 1px 100%);
  background-size:calc(100% / 38) 100%;
  border:1px solid var(--line);
}
.track__fill{
  position:absolute;
  inset:0 auto 0 0;
  width:var(--track,72%);
  border-radius:2px 0 0 2px;
  background:linear-gradient(90deg,var(--score) 0%,var(--cyan) 100%);
  box-shadow:0 0 18px rgba(53,242,192,.45);
}
.track__marker{
  position:absolute;
  left:var(--at,72%);
  top:-7px;
  bottom:-7px;
  width:3px;
  background:var(--flame);
  box-shadow:0 0 12px var(--flame);
}
.track__legend{
  display:flex;
  flex-wrap:wrap;
  gap:clamp(12px,3vw,26px);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--muted);
}
.track__legend-item b{color:var(--ink);font-weight:700;}
.track__legend-item--now b{color:var(--flame);}

.footer-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1.5fr 1fr;
  gap:clamp(20px,3vw,44px);
  margin-top:clamp(28px,4vw,48px);
}
.footer-col{min-width:0;}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-bottom:14px;
  padding-left:12px;
  position:relative;
}
.footer-col__title::before{
  content:"";
  position:absolute;
  left:0;
  top:.4em;
  width:5px;
  height:5px;
  border-radius:1px;
  background:var(--cyan);
  box-shadow:0 0 10px var(--cyan);
}
.footer-list{display:grid;gap:9px;}
.footer-list a{
  display:inline-block;
  font-size:14.5px;
  color:#C5DDD5;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-list a:hover{
  color:var(--cyan);
  transform:translateX(3px);
}
.footer-list--meta li{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--muted);
}

.contact-list{display:grid;gap:12px;}
.contact-row{
  display:grid;
  grid-template-columns:46px 1fr auto;
  align-items:start;
  gap:8px;
  font-size:14px;
  color:#C5DDD5;
}
.contact-row__key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
  padding-top:4px;
}
.contact-row__val{
  word-break:break-all;
  line-height:1.6;
}
.copy-btn{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  padding:3px 8px;
  border:1px solid var(--line);
  border-radius:4px;
  color:var(--muted);
  cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:rgba(53,242,192,.5);}
.copy-btn[data-copied]{
  color:#04120D;
  background:var(--cyan);
  border-color:var(--cyan);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(26px,4vw,42px);
  padding-top:18px;
  border-top:3px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--muted);
}
.footer-base__meta{white-space:nowrap;}

.to-top{
  position:fixed;
  right:var(--pad);
  bottom:calc(var(--pad) + 6px);
  z-index:72;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border:3px solid var(--line);
  border-radius:12px;
  background:rgba(9,22,17,.92);
  color:var(--cyan);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),
             visibility var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.to-top svg{
  width:20px;
  height:20px;
  fill:none;
  stroke:currentColor;
  stroke-width:1.8;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none;}
.to-top:hover{border-color:var(--cyan);box-shadow:0 0 0 4px rgba(53,242,192,.14);}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1180px){
  .nav__link{padding:8px 10px;font-size:13px;}
  .brand__tag{display:none;}
}
@media (max-width:1020px){
  .header__cta{display:none;}
}
@media (max-width:900px){
  body{padding-bottom:92px;}
  .nav-toggle{display:block;}
  .header-island{padding:7px 8px 7px 14px;}

  .nav{
    position:fixed;
    left:var(--pad);
    right:var(--pad);
    bottom:calc(max(10px,env(safe-area-inset-bottom,10px)) + 78px);
    z-index:78;
    padding:14px;
    border:3px solid var(--line);
    border-radius:18px;
    background:rgba(9,22,17,.98);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    box-shadow:0 26px 60px -26px rgba(0,0,0,.98);
    opacity:0;
    visibility:hidden;
    transform:translateY(14px) scale(.98);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),
               visibility var(--dur) var(--ease);
  }
  .nav[data-open]{opacity:1;visibility:visible;transform:none;}
  .nav__list{flex-direction:column;align-items:stretch;gap:6px;}
  .nav__link{
    padding:13px 16px;
    border-radius:12px;
    border-color:var(--line);
    font-size:15px;
  }
  .nav__link[aria-current="page"]{box-shadow:none;}

  .quickbar{display:grid;}
  .to-top{bottom:calc(max(10px,env(safe-area-inset-bottom,10px)) + 78px);}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 6;}
  .toc{position:static;border-left:0;border-top:3px solid var(--line);padding-left:0;padding-top:12px;}
}
@media (max-width:620px){
  body{font-size:16px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-base{flex-direction:column;gap:8px;}
  .footer-base__meta{white-space:normal;}
  .grid--12{grid-template-columns:minmax(0,1fr);}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 1;}
  .contact-row{grid-template-columns:42px 1fr;gap:6px;}
  .contact-row .copy-btn{grid-column:2;justify-self:start;}
  .track{align-items:stretch;}
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  body::before{animation:none;}
  .reveal{opacity:1;transform:none;}
  .to-top{transition:none;}
  .tabs__panel[data-active]{animation:none;}
}