/* ============================================================
   IM赛事 · IM SPORT — 共享站点样式 /assets/site.css
   母题：6° 斜切 · 纸张叠层 · 数据线框 · 等宽数字
   ============================================================ */

:root{
  --im-ink-900:#06110E;
  --im-ink-700:#0E2A22;
  --im-ink-500:#17453A;
  --im-teal-400:#4FE3C1;
  --im-teal-200:#A9F3E2;
  --im-orange-500:#FF8A3D;
  --im-paper-50:#F4F7F5;
  --im-paper-100:#E7EDE9;
  --im-data-800:#1C2422;
  --im-gray-500:#7C8C87;
  --im-white-ink:#E9F3EF;

  --im-line:rgba(23,69,58,.14);
  --im-line-strong:rgba(23,69,58,.30);
  --im-line-dark:rgba(169,243,226,.20);

  --im-max:1240px;
  --im-gutter:18px;

  --im-radius-s:5px;
  --im-radius-m:12px;
  --im-radius-l:20px;
  --im-radius-pill:999px;

  --im-shadow-paper:4px 4px 0 rgba(6,17,14,.13);
  --im-shadow-lift:0 20px 40px -30px rgba(6,17,14,.75);

  --im-ease:cubic-bezier(.22,.61,.36,1);

  --im-font-display:"Barlow Condensed","Oswald","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --im-font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --im-font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

@media (min-width:640px){
  :root{--im-gutter:24px;}
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
img,svg,video{display:block;max-width:100%;}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:inherit;}

:focus-visible{
  outline:2px solid var(--im-ink-900);
  outline-offset:2px;
  box-shadow:0 0 0 5px var(--im-teal-400);
  border-radius:4px;
}

#main-content{scroll-margin-top:96px;}

/* ---------- 中文排版 ---------- */
body{
  font-family:var(--im-font-body);
  font-size:16px;
  line-height:1.85;
  font-weight:400;
  color:var(--im-ink-900);
  background:var(--im-paper-50);
  text-wrap:pretty;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:640px){
  body{font-size:17px;}
}

h1,h2,h3,h4,.section-title,.footer-title{
  font-family:var(--im-font-display);
  font-weight:800;
  letter-spacing:-.01em;
  line-height:1.14;
  text-wrap:balance;
  font-stretch:condensed;
}

h1{font-size:clamp(2.6rem,6vw,4.6rem);}
h2{font-size:clamp(1.6rem,3vw,2.4rem);}
h3{font-size:1.25rem;line-height:1.35;}

p{max-width:72ch;}

.num,.footer-year{
  font-family:var(--im-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}

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

/* ---------- 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--im-max);
  margin-inline:auto;
  padding-inline:var(--im-gutter);
}

.section{padding-block:clamp(48px,7vw,88px);}
.section--paper{background:var(--im-paper-100);}
.section--dark{background:var(--im-ink-900);color:var(--im-white-ink);}
.section--data{background:var(--im-data-800);color:var(--im-white-ink);}
.section--dark p,.section--data p{color:rgba(233,243,239,.80);}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 28px;
  margin-bottom:clamp(24px,3.4vw,40px);
}
.section-title{margin-top:10px;}
.section-lead{
  max-width:52ch;
  margin-top:10px;
  font-size:15px;
  line-height:1.8;
  color:var(--im-gray-500);
}
.section--dark .section-lead,.section--data .section-lead{color:rgba(233,243,239,.62);}

.rule-slant{
  display:block;
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,transparent,var(--im-teal-400) 20%,var(--im-orange-500) 80%,transparent);
  transform:rotate(-.6deg);
  transform-origin:left center;
  opacity:.85;
}

/* ---------- 标签 ---------- */
.label-chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--im-line-strong);
  border-radius:3px;
  background:rgba(79,227,193,.10);
  font-family:var(--im-font-mono);
  font-size:11px;
  font-weight:600;
  line-height:1.5;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--im-ink-500);
}
.section--dark .label-chip,.section--data .label-chip{
  color:var(--im-teal-200);
  border-color:var(--im-line-dark);
  background:rgba(79,227,193,.10);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid var(--im-ink-500);
  border-radius:var(--im-radius-pill);
  background:transparent;
  font-family:var(--im-font-body);
  font-size:14px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.01em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--im-ease),border-color .18s var(--im-ease),
             color .18s var(--im-ease),transform .16s var(--im-ease),box-shadow .18s var(--im-ease);
}
.btn:active{transform:translateY(1px);}

.btn--primary{
  background:var(--im-orange-500);
  border-color:var(--im-orange-500);
  color:#18100A;
}
.btn--primary:hover{background:#FFA46A;border-color:#FFA46A;}

.btn--ghost{
  background:transparent;
  border-color:rgba(169,243,226,.34);
  color:var(--im-teal-200);
}
.btn--ghost:hover{background:rgba(79,227,193,.14);border-color:var(--im-teal-400);}

.btn--quiet{
  background:transparent;
  border-color:transparent;
  color:rgba(233,243,239,.78);
  font-weight:600;
}
.btn--quiet:hover{background:rgba(79,227,193,.13);color:var(--im-teal-200);}

.btn--ink{
  background:var(--im-ink-700);
  border-color:var(--im-ink-700);
  color:var(--im-white-ink);
}
.btn--ink:hover{background:var(--im-ink-500);border-color:var(--im-teal-400);}

.btn--outline{
  background:transparent;
  border-color:var(--im-line-strong);
  color:var(--im-ink-700);
}
.btn--outline:hover{background:rgba(79,227,193,.12);border-color:var(--im-teal-400);}
.section--dark .btn--outline,.section--data .btn--outline{
  border-color:var(--im-line-dark);
  color:var(--im-teal-200);
}
.section--dark .btn--outline:hover,.section--data .btn--outline:hover{
  border-color:var(--im-teal-400);
  background:rgba(79,227,193,.14);
}

.btn--sm{padding:7px 13px;font-size:12.5px;}

/* ---------- 卡片 / 纸张叠层 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,24px);
  background:var(--im-paper-50);
  border:1px solid var(--im-line-strong);
  border-radius:var(--im-radius-m);
  box-shadow:var(--im-shadow-paper);
  transition:transform .18s var(--im-ease),box-shadow .18s var(--im-ease),border-color .18s var(--im-ease);
}
.card:hover{
  transform:translateY(-2px);
  border-color:var(--im-teal-400);
  box-shadow:5px 7px 0 rgba(6,17,14,.15);
}
.section--dark .card{
  background:var(--im-ink-700);
  border-color:var(--im-ink-500);
  color:var(--im-white-ink);
  box-shadow:4px 4px 0 rgba(6,17,14,.4);
}
.section--dark .card:hover{border-color:var(--im-teal-400);}
.section--data .card{
  background:var(--im-data-800);
  border-color:rgba(169,243,226,.16);
  color:var(--im-white-ink);
  box-shadow:4px 4px 0 rgba(6,17,14,.45);
}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:1px solid var(--im-line-strong);
  border-radius:var(--im-radius-m);
  background-color:var(--im-data-800);
  background-image:
    linear-gradient(90deg,rgba(79,227,193,.10) 1px,transparent 1px),
    linear-gradient(0deg,rgba(79,227,193,.10) 1px,transparent 1px);
  background-size:48px 48px;
}
.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:46%;
  background:linear-gradient(180deg,transparent,rgba(6,17,14,.66));
  pointer-events:none;
}
.media-frame__tag{
  position:absolute;
  left:12px;
  bottom:12px;
  z-index:2;
  padding:4px 8px;
  border:1px solid rgba(169,243,226,.32);
  border-radius:3px;
  background:rgba(6,17,14,.62);
  color:var(--im-teal-200);
  font-family:var(--im-font-mono);
  font-size:11px;
  letter-spacing:.08em;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  padding-block:16px 4px;
  font-size:13px;
  color:var(--im-gray-500);
}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
}
.breadcrumbs li{display:flex;align-items:center;gap:6px;}
.breadcrumbs li + li::before{content:"/";color:var(--im-line-strong);}
.breadcrumbs a{
  text-decoration:none;
  color:var(--im-ink-500);
  border-bottom:1px solid transparent;
  transition:color .16s var(--im-ease),border-color .16s var(--im-ease);
}
.breadcrumbs a:hover{color:var(--im-ink-900);border-bottom-color:var(--im-teal-400);}

/* ---------- 正文容器 ---------- */
.prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.85;
}
.prose > * + *{margin-top:1.2em;}
.prose h2{margin-top:2em;font-size:clamp(1.4rem,2.4vw,1.9rem);}
.prose h3{margin-top:1.6em;font-size:1.2rem;}
.prose ul{padding-left:1.2em;}
.prose ul li{position:relative;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:-1.05em;
  top:.72em;
  width:6px;
  height:6px;
  background:var(--im-teal-400);
  transform:skewX(-12deg);
}
.prose a{
  color:var(--im-ink-700);
  text-decoration:underline;
  text-decoration-color:var(--im-teal-400);
  text-underline-offset:3px;
}
.prose a:hover{background:rgba(79,227,193,.16);}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,24px);}
.grid--2{grid-template-columns:minmax(0,1fr);}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
}

/* ---------- Bento 模块板 ---------- */
.bento{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(14px,2vw,22px);
}
.bento > *{grid-column:span 12;min-width:0;}
@media (min-width:640px){
  .bento > .cell--1x1{grid-column:span 6;}
  .bento > .cell--2x1{grid-column:span 6;}
  .bento > .cell--2x2{grid-column:span 12;}
  .bento > .cell--3x2{grid-column:span 12;}
}
@media (min-width:960px){
  .bento > .cell--1x1{grid-column:span 3;}
  .bento > .cell--2x1{grid-column:span 6;}
  .bento > .cell--2x2{grid-column:span 6;}
  .bento > .cell--3x2{grid-column:span 9;}
  .bento > .cell--lift{margin-top:-28px;}
}

/* ---------- 轮次切换 ---------- */
.tablist{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding:5px;
  border:1px solid var(--im-line-strong);
  border-radius:var(--im-radius-pill);
  background:var(--im-paper-100);
}
.tab{
  flex:1 1 auto;
  min-width:max-content;
  padding:8px 14px;
  border-radius:var(--im-radius-pill);
  font-family:var(--im-font-mono);
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--im-ink-500);
  cursor:pointer;
  transition:background-color .16s var(--im-ease),color .16s var(--im-ease);
}
.tab:hover{background:rgba(79,227,193,.20);color:var(--im-ink-900);}
.tab[aria-selected="true"]{background:var(--im-ink-700);color:var(--im-teal-200);}
.tabpanel{margin-top:16px;}
.tabpanel[hidden]{display:none;}

/* ---------- 显现 ---------- */
html[data-reveal] .reveal{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .28s var(--im-ease),transform .28s var(--im-ease);
}
html[data-reveal] .reveal.is-in{opacity:1;transform:none;}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 16px;
  border-radius:var(--im-radius-s);
  background:var(--im-teal-400);
  color:var(--im-ink-900);
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s var(--im-ease);
}
.skip-link:focus-visible{transform:none;}

/* ============================================================
   头部：悬浮胶囊导航
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  padding:14px var(--im-gutter) 10px;
  transition:padding .2s var(--im-ease);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0 0 -16px 0;
  background:linear-gradient(180deg,var(--im-paper-50) 0%,var(--im-paper-50) 74%,rgba(244,247,245,0) 100%);
  opacity:0;
  transition:opacity .2s var(--im-ease);
  z-index:-1;
  pointer-events:none;
}
.site-header[data-stuck]::before{opacity:1;}
.site-header[data-stuck]{padding-top:8px;}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  width:100%;
  max-width:var(--im-max);
  margin-inline:auto;
  padding:9px 12px 9px 14px;
  background:var(--im-ink-700);
  border:1px solid var(--im-ink-500);
  border-radius:var(--im-radius-pill);
  box-shadow:0 16px 34px -24px rgba(6,17,14,.9),inset 0 0 0 1px rgba(79,227,193,.06);
  transition:border-radius .2s var(--im-ease),padding .2s var(--im-ease);
}
.site-header[data-stuck] .header-inner{padding-block:6px;}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--im-white-ink);
  border-radius:var(--im-radius-pill);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  flex:0 0 36px;
  font-family:var(--im-font-mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--im-ink-900);
  background:var(--im-teal-400);
  border-radius:10px;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
  transition:background-color .18s var(--im-ease);
}
.brand:hover .brand-mark{background:var(--im-teal-200);}
.brand-copy{display:block;min-width:0;}
.brand-line{
  display:block;
  font-family:var(--im-font-display);
  font-size:14px;
  font-weight:800;
  letter-spacing:.01em;
  line-height:1.25;
  white-space:nowrap;
}
.brand-note{
  display:block;
  font-size:10.5px;
  line-height:1.5;
  letter-spacing:.04em;
  color:rgba(233,243,239,.52);
  white-space:nowrap;
}

/* 移动端栏目按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 13px;
  border:1px solid var(--im-ink-500);
  border-radius:var(--im-radius-pill);
  background:rgba(79,227,193,.10);
  color:var(--im-teal-200);
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  cursor:pointer;
  transition:background-color .18s var(--im-ease),border-color .18s var(--im-ease);
}
.nav-toggle:hover{background:rgba(79,227,193,.20);border-color:var(--im-teal-400);}
.nav-toggle-box{display:grid;gap:4px;width:16px;}
.nav-toggle-box span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s var(--im-ease),opacity .18s var(--im-ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* 导航面板 */
.primary-nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-item{display:block;}
.nav-link{
  display:block;
  padding:8px clamp(8px,1vw,13px);
  border-radius:var(--im-radius-pill);
  font-size:clamp(13px,.95vw,14px);
  font-weight:500;
  line-height:1.5;
  white-space:nowrap;
  text-decoration:none;
  color:rgba(233,243,239,.78);
  transition:background-color .18s var(--im-ease),color .18s var(--im-ease);
}
.nav-link:hover{background:rgba(79,227,193,.15);color:var(--im-teal-200);}
.nav-link[aria-current="page"]{
  background:var(--im-teal-200);
  color:var(--im-ink-900);
  font-weight:700;
}
.nav-link[aria-current="page"]:hover{background:var(--im-teal-400);color:var(--im-ink-900);}

.nav-actions{
  display:flex;
  align-items:center;
  gap:6px;
  margin-left:8px;
  padding-left:12px;
  border-left:1px solid var(--im-ink-500);
}
.nav-actions .btn{padding:8px 14px;font-size:13px;}

/* 阅读进度 */
.scroll-progress{
  position:absolute;
  left:50%;
  bottom:2px;
  width:min(var(--im-max),calc(100% - var(--im-gutter) * 2));
  height:2px;
  transform:translateX(-50%);
  border-radius:2px;
  background:rgba(23,69,58,.10);
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--im-teal-400),var(--im-orange-500));
}

@media (max-width:1180px){
  .brand-note{display:none;}
}

/* 移动 / 平板：抽屉式栏目面板 */
@media (max-width:1023px){
  .nav-toggle{display:inline-flex;}
  .primary-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;
    right:0;
    z-index:70;
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    margin-left:0;
    padding:12px;
    background:var(--im-ink-700);
    border:1px solid var(--im-ink-500);
    border-radius:22px;
    box-shadow:0 26px 46px -28px rgba(6,17,14,.95);
    max-height:calc(100vh - 130px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .18s var(--im-ease),transform .18s var(--im-ease),visibility .18s linear;
  }
  .site-header[data-open="true"] .header-inner{border-radius:24px;}
  .site-header[data-open="true"] .primary-nav{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;}
  .nav-link{
    padding:11px 14px;
    border-radius:12px;
    font-size:15px;
  }
  .nav-link[aria-current="page"]{border-radius:12px;}
  .nav-actions{
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    margin:10px 0 0;
    padding:12px 0 0;
    border-left:0;
    border-top:1px solid var(--im-ink-500);
  }
  .nav-actions .btn{justify-content:center;padding-block:11px;font-size:14px;}
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--im-ink-900);
  color:var(--im-white-ink);
  padding-block:clamp(40px,6vw,72px) 30px;
}
.site-footer::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,var(--im-teal-400),var(--im-orange-500) 58%,rgba(79,227,193,0));
  transform:rotate(-.18deg);
  transform-origin:left center;
}
.site-footer::after{
  content:"";
  position:absolute;
  right:-140px;
  top:-120px;
  width:440px;
  height:440px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(79,227,193,.16),transparent 68%);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--im-max);
  margin-inline:auto;
  padding-inline:var(--im-gutter);
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(30px,4vw,52px);
}
@media (min-width:860px){
  .footer-top{grid-template-columns:minmax(0,1.05fr) minmax(0,1.9fr);}
}

.footer-brand{min-width:0;}
.footer-mark{
  display:inline-grid;
  place-items:center;
  width:42px;
  height:42px;
  margin-bottom:14px;
  font-family:var(--im-font-mono);
  font-size:15px;
  font-weight:700;
  color:var(--im-ink-900);
  background:var(--im-teal-400);
  border-radius:11px;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.footer-title{
  font-size:clamp(1.5rem,2.6vw,1.95rem);
  color:var(--im-white-ink);
}
.footer-sub{
  margin-top:6px;
  font-size:13px;
  letter-spacing:.04em;
  color:rgba(233,243,239,.55);
}
.footer-meta{
  display:grid;
  gap:9px;
  margin-top:22px;
  font-size:13.5px;
  line-height:1.7;
  color:rgba(233,243,239,.74);
}
.footer-meta li{
  display:flex;
  align-items:baseline;
  gap:10px;
  min-width:0;
}
.footer-meta li > span:last-child{min-width:0;overflow-wrap:anywhere;}
.footer-meta-key{
  flex:0 0 auto;
  padding:1px 6px;
  border:1px solid var(--im-line-dark);
  border-radius:3px;
  font-family:var(--im-font-mono);
  font-size:10.5px;
  line-height:1.6;
  letter-spacing:.12em;
  color:var(--im-gray-500);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:26px 20px;
  min-width:0;
}
@media (min-width:640px){
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr));}
}
.footer-col{min-width:0;}
.footer-col-title{
  padding-bottom:8px;
  margin-bottom:10px;
  border-bottom:1px solid var(--im-line-dark);
  font-family:var(--im-font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.14em;
  line-height:1.5;
  color:var(--im-teal-200);
}
.footer-col ul{display:grid;gap:1px;}
.footer-link{
  display:inline-block;
  padding-block:5px;
  border-bottom:1px solid transparent;
  font-size:14.5px;
  line-height:1.6;
  text-decoration:none;
  color:rgba(233,243,239,.76);
  transition:color .16s var(--im-ease),border-color .16s var(--im-ease);
}
.footer-link:hover{color:var(--im-teal-200);border-bottom-color:var(--im-teal-400);}

.footer-note{
  max-width:76ch;
  margin-top:clamp(28px,4vw,42px);
  padding-top:18px;
  border-top:1px solid var(--im-line-dark);
  font-size:12.5px;
  line-height:1.75;
  color:var(--im-gray-500);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:18px;
  font-size:12.5px;
  color:rgba(233,243,239,.50);
}
.footer-legal{margin:0;}
.footer-year{color:var(--im-teal-200);}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:16px;}
.footer-legal-links a{
  text-decoration:none;
  color:rgba(233,243,239,.62);
  border-bottom:1px solid transparent;
  transition:color .16s var(--im-ease),border-color .16s var(--im-ease);
}
.footer-legal-links a:hover{color:var(--im-teal-200);border-bottom-color:var(--im-teal-400);}

/* 回到顶部 */
.to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:55;
  display:grid;
  place-items:center;
  width:44px;
  height:44px;
  border:1px solid var(--im-ink-500);
  border-radius:14px;
  background:var(--im-ink-700);
  color:var(--im-teal-200);
  font-size:16px;
  line-height:1;
  box-shadow:4px 4px 0 rgba(6,17,14,.35);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  cursor:pointer;
  transition:opacity .2s var(--im-ease),transform .2s var(--im-ease),
             visibility .2s linear,border-color .18s var(--im-ease);
}
.to-top:hover{border-color:var(--im-teal-400);background:var(--im-ink-500);}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none;}

/* ============================================================
   降级：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;
  }
  html[data-reveal] .reveal{opacity:1;transform:none;}
  .card:hover{transform:none;}
  .to-top{transform:none;}
}