/* ==========================================================================
   优德赛事 · 共享样式 /assets/site.css
   深墨蓝夜场基底 + 电光青路线 + 暖金橙红重点，悬浮胶囊页头与分屏页脚
   ========================================================================== */

:root{
  --ink:#081A2B;
  --ink-2:#10263F;
  --cyan:#19E5E6;
  --cyan-soft:#8DF6F4;
  --gold:#F2B84B;
  --gold-soft:#FFE1A8;
  --ember:#FF5D3A;
  --mist:#F2F7FA;
  --slate:#132B40;
  --haze:#A8C6D8;
  --ink-deep:#04121C;

  --gutter:clamp(18px,4vw,44px);
  --maxw:1240px;
  --ease:cubic-bezier(.22,.72,.28,1);
  --radius-organic:22px 8px 22px 8px;
  --radius-pill:999px;
  --shadow-soft:0 18px 40px rgba(3,10,18,.45);

  --font-sans:"Inter","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,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}
body{
  margin:0;
  min-height:100%;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:#D6E7F1;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 620px at 88% -10%,rgba(25,229,230,.16),transparent 62%),
    radial-gradient(760px 520px at -8% 10%,rgba(242,184,75,.12),transparent 60%),
    linear-gradient(180deg,#081A2B 0%,#0A2035 46%,#071523 100%);
  background-repeat:no-repeat;
  background-attachment:scroll;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.02em;
  color:var(--mist);
  text-wrap:balance;
}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.2em}
img,svg,video{max-width:100%;display:block}
button{font-family:inherit}
a{color:var(--cyan-soft)}
[hidden]{display:none !important}
::selection{background:var(--cyan);color:#04222B}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
.skip-link:focus-visible{outline-offset:6px}

/* ---------- 通用容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.prose{
  max-width:74ch;
  font-size:1.05rem;
  line-height:1.85;
  color:#D6E7F1;
}
.prose h2{font-size:clamp(1.5rem,3vw,2.1rem);margin:2.2rem 0 .8rem}
.prose h3{font-size:clamp(1.15rem,2vw,1.45rem);margin:1.8rem 0 .6rem;color:var(--cyan-soft)}
.prose p{margin:0 0 1.05em}
.prose strong{color:var(--mist);font-weight:800}
.prose a{color:var(--cyan-soft);text-decoration:none;border-bottom:1px solid rgba(141,246,244,.4)}
.prose a:hover{border-bottom-color:currentColor}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.35em}
.prose li{margin-bottom:.45em}
.prose blockquote{
  margin:1.6rem 0;
  padding:1rem 1.3rem;
  border-left:3px solid var(--gold);
  border-radius:6px 18px 18px 6px;
  background:rgba(242,184,75,.08);
  color:#E6F1F8;
}

/* ---------- 章节头部 / 展览标签 ---------- */
.section-head{margin-bottom:clamp(1.4rem,3vw,2.4rem)}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
  padding:.28rem .1rem;
}
.eyebrow::before{
  content:"";
  width:26px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--gold),var(--ember));
}
.eyebrow--cyan{color:var(--cyan-soft)}
.eyebrow--cyan::before{background:linear-gradient(90deg,var(--cyan),var(--cyan-soft))}
.section-title{
  font-size:clamp(2rem,5.2vw,3.5rem);
  line-height:1.05;
  margin:.55rem 0 .7rem;
}
.section-title em{font-style:normal;color:var(--cyan)}
.section-lead{
  max-width:64ch;
  font-size:clamp(1rem,1.5vw,1.12rem);
  line-height:1.8;
  color:#C6DCEA;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.85rem 1.5rem;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:.95rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{
  background:linear-gradient(120deg,var(--cyan) 0%,#0FB6C6 100%);
  color:#04222B;
  box-shadow:0 12px 28px rgba(25,229,230,.26);
}
.btn--primary:hover{box-shadow:0 16px 34px rgba(25,229,230,.34)}
.btn--gold{
  background:linear-gradient(120deg,var(--gold) 0%,#FFD07A 100%);
  color:#2A1703;
  box-shadow:0 12px 28px rgba(242,184,75,.24);
}
.btn--ghost{
  background:rgba(16,38,63,.62);
  border-color:rgba(141,246,244,.32);
  color:var(--mist);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan-soft);background:rgba(25,229,230,.12)}
.btn--ember{
  background:linear-gradient(120deg,var(--ember) 0%,#FF8A5C 100%);
  color:#2A0A03;
  box-shadow:0 12px 28px rgba(255,93,58,.26);
}

/* ---------- 芯片筛选台 ---------- */
.chip-row{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{
  font:inherit;
  font-size:.85rem;
  font-weight:600;
  padding:.5rem 1rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(168,198,216,.28);
  background:rgba(16,38,63,.55);
  color:var(--haze);
  cursor:pointer;
  white-space:nowrap;
  transition:color .22s var(--ease),border-color .22s var(--ease),background-color .22s var(--ease),transform .22s var(--ease);
}
.chip:hover{color:var(--mist);border-color:rgba(141,246,244,.55);transform:translateY(-1px)}
.chip[aria-pressed="true"]{
  background:rgba(25,229,230,.16);
  border-color:var(--cyan);
  color:var(--cyan-soft);
  font-weight:800;
}

/* ---------- 卡片 / 说明牌 ---------- */
.card{
  position:relative;
  padding:1.5rem 1.4rem;
  border-radius:20px;
  border:1px solid rgba(141,246,244,.12);
  background:linear-gradient(165deg,rgba(19,43,64,.92),rgba(8,26,43,.85));
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:rgba(25,229,230,.4);box-shadow:var(--shadow-soft)}
.card--tilt{border-radius:var(--radius-organic)}
.card__label{
  display:block;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:.6rem;
}
.card__title{font-size:1.2rem;font-weight:800;color:var(--mist);margin:0 0 .5rem}
.card__text{font-size:.95rem;line-height:1.75;color:#BBD3E2;margin:0}
.card__meta{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem 1rem;
  margin-top:.9rem;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.06em;
  color:var(--haze);
}
.plate{
  position:relative;
  padding:1.5rem 1.4rem 1.5rem 1.7rem;
  border-radius:6px 26px 26px 26px;
  border:1px solid rgba(141,246,244,.14);
  background:linear-gradient(160deg,rgba(19,43,64,.94),rgba(16,38,63,.7));
}
.plate::before{
  content:"";
  position:absolute;
  left:0;
  top:1.4rem;
  bottom:1.4rem;
  width:3px;
  border-radius:3px;
  background:linear-gradient(180deg,var(--cyan),var(--gold));
}
.plate__label{
  display:block;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan-soft);
  margin-bottom:.55rem;
}
.plate__title{font-size:1.15rem;font-weight:800;color:var(--mist);margin:0 0 .45rem}
.plate__text{font-size:.94rem;line-height:1.75;color:#BBD3E2;margin:0}

/* ---------- 图片容器（页面阶段放图） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-organic);
  border:1px solid rgba(141,246,244,.14);
  background:linear-gradient(140deg,#0E2438,#132B40);
  isolation:isolate;
}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:1.6rem 1.1rem .85rem;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.06em;
  color:#CFE3EE;
  background:linear-gradient(0deg,rgba(8,26,43,.94),rgba(8,26,43,0));
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--ph::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(115deg,rgba(25,229,230,.14) 0 2px,transparent 2px 24px),
    radial-gradient(62% 72% at 24% 18%,rgba(242,184,75,.22),transparent 70%),
    radial-gradient(48% 60% at 84% 88%,rgba(255,93,58,.18),transparent 72%);
}

/* ---------- 主题带 ---------- */
.theme-band{
  position:relative;
  overflow:hidden;
  padding-block:clamp(2.2rem,5vw,3.6rem);
  border-top:1px solid rgba(141,246,244,.12);
  border-bottom:1px solid rgba(141,246,244,.12);
  background:linear-gradient(90deg,rgba(16,38,63,.9),rgba(8,26,43,.55));
}
.theme-band::after{
  content:"";
  position:absolute;
  left:-10%;right:-10%;bottom:-80px;
  height:190px;
  pointer-events:none;
  background:radial-gradient(closest-side,rgba(25,229,230,.2),transparent 78%);
}
.theme-band--gold{
  background:linear-gradient(90deg,rgba(242,184,75,.16),rgba(8,26,43,.62));
}
.theme-band--gold::after{background:radial-gradient(closest-side,rgba(242,184,75,.24),transparent 78%)}

/* ---------- 网格 ---------- */
.grid-auto{
  display:grid;
  gap:clamp(1rem,2.2vw,1.6rem);
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
}
.grid-2{display:grid;gap:clamp(1rem,2.4vw,2rem);grid-template-columns:1fr}
.grid-3{display:grid;gap:clamp(1rem,2.2vw,1.7rem);grid-template-columns:1fr}
@media (min-width:820px){
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:980px){
  .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-block:1rem .4rem}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  margin:0;
  padding:0;
  list-style:none;
  font-size:.85rem;
  color:var(--haze);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.45rem}
.breadcrumb__link{
  color:var(--haze);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumb__link:hover{color:var(--cyan-soft);border-bottom-color:currentColor}
.breadcrumb__sep{color:rgba(168,198,216,.5)}
.breadcrumb__current{color:var(--mist);font-weight:700}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-reveal="1"]{transition-delay:70ms}
[data-reveal="2"]{transition-delay:140ms}
[data-reveal="3"]{transition-delay:210ms}
[data-reveal="4"]{transition-delay:280ms}
[data-reveal="5"]{transition-delay:350ms}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:50;
  width:46px;height:46px;
  display:grid;place-items:center;
  border-radius:50%;
  border:1px solid rgba(141,246,244,.35);
  background:rgba(16,38,63,.86);
  color:var(--cyan-soft);
  font-size:.72rem;
  font-family:var(--font-mono);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease),background-color .3s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:rgba(25,229,230,.2)}

/* ==========================================================================
   跳过链接
   ========================================================================== */
.skip-link{
  position:fixed;
  top:10px;left:50%;
  z-index:200;
  transform:translate(-50%,-160%);
  padding:.7rem 1.2rem;
  border-radius:var(--radius-pill);
  background:var(--cyan);
  color:#04222B;
  font-weight:800;
  font-size:.9rem;
  text-decoration:none;
  transition:transform .25s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ==========================================================================
   页头：悬浮胶囊浮岛
   ========================================================================== */
.masthead{
  position:sticky;
  top:0;
  z-index:80;
  padding-block:14px;
  background:linear-gradient(180deg,rgba(8,26,43,.94),rgba(8,26,43,.55) 72%,rgba(8,26,43,0));
  transition:padding .32s var(--ease),background-color .32s var(--ease),box-shadow .32s var(--ease);
}
.masthead[data-condensed]{
  padding-block:7px;
  background:linear-gradient(180deg,rgba(7,22,36,.97),rgba(7,22,36,.88));
  box-shadow:0 14px 32px rgba(3,10,18,.5);
}
.masthead__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(.6rem,1.6vw,1.4rem);
}
.progress-rail{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(141,246,244,.12);
  overflow:hidden;
}
.progress-rail__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--gold) 70%,var(--ember));
  transition:width .12s linear;
}

/* 品牌浮岛 */
.brand-island{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  padding:.42rem .95rem .42rem .5rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(141,246,244,.18);
  background:rgba(16,38,63,.72);
  text-decoration:none;
  transition:border-color .28s var(--ease),transform .28s var(--ease),background-color .28s var(--ease);
}
.brand-island:hover{border-color:var(--cyan);background:rgba(25,229,230,.12)}
.masthead[data-condensed] .brand-island{transform:scale(.95)}
.brand-island__mark{
  width:38px;height:38px;
  display:grid;place-items:center;
  border-radius:46% 54% 58% 42% / 52% 44% 56% 48%;
  background:linear-gradient(140deg,var(--cyan),#0E7F96);
  box-shadow:0 6px 18px rgba(25,229,230,.28);
}
.brand-island__glyph{font-size:1.02rem;font-weight:900;color:#03202A}
.brand-island__text{display:flex;flex-direction:column;line-height:1.16}
.brand-island__line{font-size:1rem;font-weight:800;letter-spacing:.02em;color:var(--mist)}
.brand-island__sub{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.14em;
  color:var(--haze);
  transition:opacity .28s var(--ease);
}
.masthead[data-condensed] .brand-island__sub{opacity:0}

/* 栏目浮岛 */
.nav-island{
  display:flex;
  align-items:center;
  gap:clamp(.3rem,1vw,.9rem);
  margin-left:auto;
  padding:.38rem .5rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(141,246,244,.16);
  background:rgba(7,23,38,.8);
  backdrop-filter:blur(12px);
  box-shadow:0 12px 30px rgba(3,10,18,.42);
}
.nav-island__list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.15rem;
  margin:0;
  padding:0;
  list-style:none;
}
.nav-pill{
  display:inline-flex;
  align-items:center;
  padding:.5rem .9rem;
  border-radius:var(--radius-pill);
  font-size:.9rem;
  font-weight:600;
  color:var(--haze);
  text-decoration:none;
  white-space:nowrap;
  transition:color .24s var(--ease),background-color .24s var(--ease),box-shadow .24s var(--ease);
}
.nav-pill:hover{color:var(--cyan-soft);background:rgba(25,229,230,.12)}
.nav-pill[aria-current="page"]{
  background:linear-gradient(135deg,rgba(25,229,230,.95),rgba(25,229,230,.6));
  color:#04222B;
  font-weight:800;
  box-shadow:0 6px 18px rgba(25,229,230,.26);
}
.masthead__actions{
  display:flex;
  align-items:center;
  gap:.35rem;
  padding-left:.7rem;
  margin-left:.15rem;
  border-left:1px solid rgba(141,246,244,.18);
}
.action-chip{
  display:inline-flex;
  align-items:center;
  padding:.45rem .85rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(168,198,216,.34);
  font-size:.82rem;
  font-weight:600;
  color:var(--mist);
  text-decoration:none;
  white-space:nowrap;
  transition:color .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease),background-color .24s var(--ease);
}
.action-chip:hover{color:var(--cyan-soft);border-color:var(--cyan);transform:translateY(-1px)}
.action-chip--accent{
  border-color:transparent;
  background:linear-gradient(120deg,var(--gold) 0%,var(--ember) 100%);
  color:#1A0B04;
  font-weight:800;
  box-shadow:0 8px 20px rgba(255,93,58,.28);
}
.action-chip--accent:hover{color:#1A0B04;transform:translateY(-1px)}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  width:46px;height:46px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  border-radius:16px;
  border:1px solid rgba(141,246,244,.28);
  background:rgba(16,38,63,.85);
  cursor:pointer;
  transition:border-color .24s var(--ease),background-color .24s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);background:rgba(25,229,230,.14)}
.nav-toggle__bar{
  width:20px;height:2px;
  border-radius:2px;
  background:var(--mist);
  transition:transform .28s var(--ease),opacity .２s var(--ease),background-color .24s var(--ease);
}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar{background:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ==========================================================================
   页脚：四栏展区说明牌
   ========================================================================== */
.site-foot{
  margin-top:clamp(3rem,7vw,5.5rem);
  padding-block:clamp(2.4rem,6vw,4.2rem) 1.4rem;
  border-top:1px solid rgba(141,246,244,.16);
  background:linear-gradient(180deg,#0B1F33 0%,#061420 100%);
  color:var(--haze);
}
.foot-grid{
  display:grid;
  gap:clamp(1.6rem,3.4vw,2.4rem);
  grid-template-columns:1fr;
}
.foot-brand{max-width:36ch}
.foot-brand__mark{
  width:44px;height:44px;
  display:grid;place-items:center;
  border-radius:46% 54% 58% 42% / 52% 44% 56% 48%;
  background:linear-gradient(140deg,var(--cyan),#0B7E93);
  color:#03151C;
  font-weight:900;
  font-size:1.15rem;
}
.foot-brand__name{margin:.7rem 0 .35rem;font-size:1.2rem;font-weight:800;color:var(--mist)}
.foot-brand__note{margin:0;font-size:.92rem;line-height:1.75;color:var(--haze)}
.foot-col{min-width:0}
.foot-col__title{
  margin:0 0 .9rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
}
.foot-list{
  display:flex;
  flex-direction:column;
  gap:.6rem;
  margin:0;
  padding:0;
  list-style:none;
}
.foot-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-size:.95rem;
  color:#C6DCEA;
  text-decoration:none;
  transition:color .22s var(--ease),transform .22s var(--ease);
}
.foot-link::before{
  content:"";
  width:6px;height:6px;
  flex:none;
  border-radius:2px;
  background:rgba(25,229,230,.6);
  transform:rotate(45deg);
}
.foot-link:hover{color:var(--cyan-soft);transform:translateX(3px)}
.contact-line{
  display:flex;
  gap:.6rem;
  font-size:.9rem;
  line-height:1.65;
  color:#C6DCEA;
}
.contact-line__k{
  flex:0 0 3.2em;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.08em;
  color:var(--haze);
  padding-top:.22em;
}
.contact-line__v{min-width:0;word-break:break-word}
.foot-note{
  margin:1rem 0 0;
  max-width:44ch;
  font-size:.82rem;
  line-height:1.75;
  color:rgba(168,198,216,.82);
}
.copy-mail{
  margin-top:1rem;
  padding:.55rem 1.2rem;
  border-radius:var(--radius-pill);
  border:1px solid rgba(25,229,230,.45);
  background:rgba(25,229,230,.1);
  color:var(--cyan-soft);
  font-size:.85rem;
  font-weight:700;
  cursor:pointer;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease);
}
.copy-mail:hover{background:rgba(25,229,230,.2);transform:translateY(-1px)}
.copy-mail[data-copied]{background:var(--cyan);color:#04222B;border-color:transparent}
.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.8rem 1.4rem;
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1.3rem;
  border-top:1px solid rgba(141,246,244,.14);
  font-size:.82rem;
  color:var(--haze);
}
.foot-bottom__meta{margin:0}
.foot-icp{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.04em;
  color:var(--haze);
  text-decoration:none;
  border-bottom:1px dashed rgba(168,198,216,.42);
}
.foot-icp:hover{color:var(--cyan-soft);border-bottom-color:currentColor}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (min-width:760px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr}
}
@media (min-width:1080px){
  .foot-grid{grid-template-columns:1.5fr .85fr .85fr 1.35fr;align-items:start}
}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .nav-island{
    position:absolute;
    top:calc(100% + 8px);
    left:var(--gutter);
    right:var(--gutter);
    margin-left:0;
    flex-direction:column;
    align-items:stretch;
    gap:.55rem;
    padding:1rem;
    border-radius:22px;
    max-height:min(72vh,540px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px) scale(.985);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease);
  }
  .nav-island[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-island__list{flex-direction:column;align-items:stretch;gap:.2rem}
  .nav-pill{padding:.72rem 1rem;font-size:1rem;justify-content:flex-start}
  .masthead__actions{
    flex-wrap:wrap;
    margin:0;
    padding:.75rem 0 0;
    border-left:0;
    border-top:1px solid rgba(141,246,244,.18);
  }
  .action-chip{flex:1 1 auto;justify-content:center}
}

@media (max-width:520px){
  .brand-island__sub{display:none}
  .brand-island{padding:.4rem .8rem .4rem .45rem}
  .brand-island__mark{width:34px;height:34px}
  .section-title{font-size:clamp(1.9rem,8vw,2.4rem)}
}

/* ==========================================================================
   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;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .progress-rail__bar{transition:none}
  .btn:hover,.card:hover,.chip:hover{transform:none}
}