/* ============================================================
   乐动在线官网 · 共享样式表 /assets/site.css
   设计签名 51b5375bff4ebba0
   深空黑 / 石墨板块 / 电光青 / 荧光绿 / 活力橙 / 暖纸色
   ============================================================ */

/* ---------- 0. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 20px)}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse}
[hidden]{display:none !important}

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B0F12;
  --ink-2:#161E23;
  --cyan:#00E5FF;
  --lime:#7CFF4F;
  --orange:#FF6A2B;
  --mist:#F2F7F7;
  --paper:#F7F4EE;
  --edge:#A8F4FF;
  --muted:#A9B6BC;
  --text-dark:#12181C;
  --line-dark:rgba(168,244,255,.18);
  --line-soft:rgba(168,244,255,.10);
  --line-paper:rgba(18,24,28,.14);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1180px;
  --radius:6px;
  --header-h:78px;
  --header-h-compact:62px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- 2. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  background:var(--ink);
  color:var(--mist);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:800;line-height:1.16;letter-spacing:-.02em}
p{max-width:72ch}
::selection{background:var(--cyan);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}
.band--paper :focus-visible,.band--mist :focus-visible{outline-color:#0A6E80}

.display-xl{font-size:clamp(38px,8.2vw,96px);font-weight:900;line-height:.98;letter-spacing:-.035em;max-width:none}
.display-lg{font-size:clamp(30px,5.4vw,56px);font-weight:900;line-height:1.04;letter-spacing:-.03em;max-width:none}
.display-md{font-size:clamp(23px,3.4vw,40px);font-weight:800;line-height:1.12;letter-spacing:-.022em;max-width:none}
.lead{font-size:clamp(16px,1.6vw,19px);line-height:1.72;color:rgba(242,247,247,.84);max-width:58ch}
.band--paper .lead,.band--mist .lead{color:rgba(18,24,28,.78)}
.text-muted{color:var(--muted)}
.band--paper .text-muted,.band--mist .text-muted{color:rgba(18,24,28,.62)}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;line-height:1.4;color:var(--cyan)}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.75}
.band--paper .eyebrow,.band--mist .eyebrow{color:#0B6C7A}

.label-mono{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.14em;line-height:1.5}
.num-lg{font-family:var(--font-display);font-weight:900;font-size:clamp(46px,9vw,92px);line-height:.88;letter-spacing:-.05em;color:var(--cyan);max-width:none}
.num-lg--lime{color:var(--lime)}
.num-lg--orange{color:var(--orange)}
.rot-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;line-height:1;color:var(--edge);opacity:.7;writing-mode:vertical-rl;text-orientation:mixed}
.band--paper .rot-note,.band--mist .rot-note{color:#0B6C7A;opacity:.65}

/* ---------- 3. 布局容器 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.wrap--narrow{max-width:760px}
.section{position:relative;padding:clamp(52px,8vw,104px) 0}
.section--tight{padding:clamp(32px,5vw,60px) 0}
.section > .wrap{position:relative;z-index:1}

.band--ink{background:var(--ink);color:var(--mist)}
.band--panel{background:var(--ink-2);color:var(--mist)}
.band--mist{background:var(--mist);color:var(--text-dark)}
.band--paper{background:var(--paper);color:var(--text-dark)}
.band--ink,.band--panel,.band--mist,.band--paper{position:relative}
.band--ink::before,.band--panel::before,.page-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(168,244,255,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(168,244,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(130% 110% at 50% 0%,#000 20%,transparent 88%);
  mask-image:radial-gradient(130% 110% at 50% 0%,#000 20%,transparent 88%);
}
.band--ink::after,.band--panel::after{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,rgba(0,229,255,.35),transparent);pointer-events:none}

.page-hero{
  position:relative;overflow:hidden;
  background:var(--ink);color:var(--mist);
  padding:calc(var(--header-h) + clamp(46px,8vw,92px)) 0 clamp(40px,6vw,76px);
}
.page-hero > *{position:relative;z-index:1}

.grid{display:grid;gap:clamp(14px,2vw,22px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--stagger > *:nth-child(even){margin-top:clamp(12px,2.4vw,30px)}

/* ---------- 4. 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 22px;border-radius:5px;border:1px solid transparent;font-size:15px;font-weight:800;letter-spacing:.01em;line-height:1.2;text-decoration:none;transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:#180802}
.btn--primary:hover{box-shadow:0 12px 26px rgba(255,106,43,.32)}
.btn--lime{background:var(--lime);color:#0A1A03}
.btn--lime:hover{box-shadow:0 12px 26px rgba(124,255,79,.28)}
.btn--ghost{border-color:rgba(0,229,255,.55);background:rgba(0,229,255,.07);color:var(--cyan)}
.btn--ghost:hover{background:rgba(0,229,255,.14)}
.btn--quiet{border-color:var(--line-dark);background:rgba(242,247,247,.04);color:var(--mist)}
.btn--quiet:hover{border-color:rgba(0,229,255,.45);color:var(--cyan)}
.btn--sm{padding:9px 15px;font-size:13px}

/* ---------- 5. 卡片与标记 ---------- */
.card{position:relative;background:var(--ink-2);border:1px solid var(--line-dark);border-radius:var(--radius);padding:clamp(18px,2.4vw,26px);color:var(--mist);transition:transform .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease)}
.card:hover{transform:translateY(-2px);border-color:rgba(0,229,255,.45);box-shadow:0 0 0 1px rgba(0,229,255,.16),0 16px 34px rgba(0,0,0,.4)}
.card--flat{background:rgba(22,30,35,.5)}
.card--shear{border-radius:0;clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%)}
.card-title{font-size:19px;font-weight:800;line-height:1.3;letter-spacing:-.01em}
.card-meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--muted);margin-top:10px}
.band--paper .card,.band--mist .card{background:#fff;border-color:var(--line-paper);color:var(--text-dark)}
.band--paper .card:hover,.band--mist .card:hover{border-color:rgba(10,110,128,.5);box-shadow:0 14px 30px rgba(18,24,28,.12)}
.band--paper .card-meta,.band--mist .card-meta{color:rgba(18,24,28,.55)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border:1px solid currentColor;border-radius:3px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.1em;line-height:1.5;white-space:nowrap}
.tag--cat{color:var(--cyan)}
.tag--ver{color:var(--lime)}
.tag--muted{color:var(--muted)}
.tag--update{background:var(--orange);border-color:var(--orange);color:#180802;font-weight:700;animation:tag-breathe .9s ease-out 1}
@keyframes tag-breathe{0%{box-shadow:0 0 0 0 rgba(255,106,43,.55)}100%{box-shadow:0 0 0 12px rgba(255,106,43,0)}}

/* ---------- 6. 面包屑 / 索引列表 / 正文 ---------- */
.crumbs{margin-bottom:18px}
.crumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted)}
.crumb-item + .crumb-item::before{content:"/";margin-right:6px;color:rgba(168,244,255,.45)}
.crumb-item a{text-decoration:none}
.crumb-item a:hover{color:var(--cyan)}
.crumb-item [aria-current="page"]{color:var(--cyan)}
.band--paper .crumb-item [aria-current="page"],.band--mist .crumb-item [aria-current="page"]{color:#0B6C7A}
.band--paper .crumb-list,.band--mist .crumb-list{color:rgba(18,24,28,.5)}

.index-list{border-top:1px solid var(--line-dark)}
.index-row{display:grid;grid-template-columns:minmax(92px,138px) 1fr auto;gap:12px 18px;align-items:baseline;padding:14px 6px;border-bottom:1px solid var(--line-soft);text-decoration:none;transition:background-color .16s var(--ease),padding-left .16s var(--ease)}
.index-row:hover{background:rgba(0,229,255,.06);padding-left:12px}
.index-time{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--cyan)}
.index-title{font-weight:700;letter-spacing:-.01em}
.band--paper .index-list,.band--mist .index-list{border-top-color:var(--line-paper)}
.band--paper .index-row,.band--mist .index-row{border-bottom-color:var(--line-paper)}
.band--paper .index-row:hover,.band--mist .index-row:hover{background:rgba(10,110,128,.06)}
.band--paper .index-time,.band--mist .index-time{color:#0B6C7A}

.prose{max-width:680px;font-size:16px;line-height:1.8}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(21px,2.6vw,28px);margin-top:1.8em;letter-spacing:-.02em}
.prose h3{font-size:clamp(17px,2vw,21px);margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.3em}
.prose ul{list-style:square}
.prose li{margin-bottom:.5em}
.prose strong{font-weight:800}

/* ---------- 7. 图片容器（页面阶段放置占位/内联 SVG） ---------- */
.media{position:relative;overflow:hidden;border:1px solid var(--line-dark);border-radius:var(--radius);background:linear-gradient(135deg,rgba(0,229,255,.12),rgba(124,255,79,.06) 55%,rgba(255,106,43,.10));isolation:isolate}
.media::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background-image:linear-gradient(rgba(168,244,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(168,244,255,.12) 1px,transparent 1px);background-size:38px 38px}
.media > img,.media > svg,.media > picture > img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover;display:block}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--shear{border-radius:0;clip-path:polygon(0 3%,100% 0,100% 97%,0 100%)}
.media-caption{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);margin-top:10px}
.band--paper .media-caption,.band--mist .media-caption{color:rgba(18,24,28,.55)}

/* ---------- 8. 工具类 ---------- */
.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}
.skip-link{position:fixed;top:-120px;left:14px;z-index:200;display:inline-flex;align-items:center;padding:11px 18px;border-radius:0 0 6px 6px;background:var(--lime);color:#0A1A03;font-weight:800;font-size:14px;text-decoration:none;transition:top .18s var(--ease)}
.skip-link:focus{top:0}

/* ---------- 9. 头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  color:var(--mist);
  background:linear-gradient(180deg,rgba(11,15,18,.95),rgba(11,15,18,.76) 58%,rgba(11,15,18,0));
  transition:background-color .22s var(--ease),box-shadow .22s var(--ease),backdrop-filter .22s var(--ease);
}
.site-header.is-scrolled,.site-header[data-open]{
  background:rgba(11,15,18,.985);
  box-shadow:0 12px 28px rgba(0,0,0,.45);
  border-bottom:1px solid var(--line-dark);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.header-bar{
  max-width:var(--wrap);margin:0 auto;
  height:var(--header-h);
  padding:0 clamp(14px,3vw,32px);
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  transition:height .22s var(--ease);
}
.site-header.is-scrolled .header-bar{height:var(--header-h-compact)}

.brand{display:inline-flex;flex-direction:column;gap:2px;line-height:1.05;text-decoration:none;color:var(--mist);flex:0 0 auto}
.brand-mark{font-family:var(--font-display);font-size:17px;font-weight:900;letter-spacing:-.015em}
.brand-mark::after{content:"";display:inline-block;width:7px;height:7px;margin-left:7px;border-radius:50%;background:var(--lime);vertical-align:middle;transform:translateY(-2px)}
.brand-line{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--cyan);opacity:.88}

.primary-nav{margin-left:auto;display:flex;align-items:center;gap:clamp(10px,1.6vw,24px)}
.nav-list{display:flex;align-items:center;gap:clamp(2px,.7vw,8px)}
.nav-link{display:inline-flex;align-items:baseline;gap:.42em;padding:8px 10px;border-radius:4px;font-size:14px;font-weight:700;letter-spacing:-.01em;text-decoration:none;color:rgba(242,247,247,.82);transition:color .15s var(--ease),background-color .15s var(--ease),box-shadow .15s var(--ease)}
.nav-link::before{content:attr(data-idx);font-family:var(--font-mono);font-size:9px;letter-spacing:.06em;color:var(--cyan);opacity:.6;transform:translateY(-4px)}
.nav-link:hover{color:var(--cyan);background:rgba(0,229,255,.08)}
.nav-link[aria-current="page"]{color:#04191D;background:var(--cyan);box-shadow:0 0 0 1px rgba(0,229,255,.5),0 8px 20px rgba(0,229,255,.22)}
.nav-link[aria-current="page"]::before{color:#04191D;opacity:.65}

.nav-side{display:flex;align-items:center;gap:clamp(8px,1.2vw,16px);padding-left:clamp(8px,1.5vw,20px);border-left:1px solid var(--line-dark)}
.tool-link{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-decoration:none;color:var(--muted);padding:6px 2px;border-bottom:1px solid transparent;transition:color .15s var(--ease),border-color .15s var(--ease)}
.tool-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.tool-switch{display:inline-flex;align-items:center;gap:7px;padding:6px 10px;border:1px solid rgba(168,244,255,.22);border-radius:999px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--muted);transition:color .16s var(--ease),border-color .16s var(--ease)}
.tool-switch .switch-dot{width:7px;height:7px;border-radius:50%;background:rgba(168,244,255,.45);transition:background-color .16s var(--ease),box-shadow .16s var(--ease)}
.tool-switch:hover{color:var(--cyan);border-color:rgba(0,229,255,.5)}
.tool-switch[aria-pressed="true"]{color:var(--lime);border-color:rgba(124,255,79,.5)}
.tool-switch[aria-pressed="true"] .switch-dot{background:var(--lime);box-shadow:0 0 0 3px rgba(124,255,79,.18)}
.header-cta{display:inline-flex;align-items:center;gap:7px;padding:9px 16px;border-radius:4px;background:var(--orange);color:#180802;font-size:13px;font-weight:800;letter-spacing:.01em;text-decoration:none;transition:transform .16s var(--ease),box-shadow .16s var(--ease)}
.header-cta::after{content:"▸";font-size:11px;line-height:1}
.header-cta:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,106,43,.34)}

.nav-toggle{display:none;align-items:center;gap:9px;margin-left:auto;padding:9px 13px;border:1px solid rgba(168,244,255,.28);border-radius:4px;background:rgba(11,15,18,.55);color:var(--mist);font-family:var(--font-mono);font-size:11px;letter-spacing:.12em}
.nav-toggle-bars{position:relative;display:inline-block;width:16px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--cyan);transition:transform .2s var(--ease),top .2s var(--ease)}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}

.scroll-rail{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(168,244,255,.12);overflow:hidden;pointer-events:none}
.scroll-rail-fill{display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--cyan),var(--lime) 68%,var(--orange))}

/* ---------- 10. 页脚 ---------- */
.site-footer{position:relative;background:var(--ink);color:var(--mist);border-top:1px solid var(--line-dark);padding:clamp(40px,6vw,72px) 0 26px}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(168,244,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(168,244,255,.05) 1px,transparent 1px);background-size:56px 56px}
.footer-inner{position:relative;z-index:1;max-width:var(--wrap);margin:0 auto;padding:0 clamp(16px,4vw,32px);display:grid;grid-template-columns:minmax(230px,1fr) 1.9fr;gap:clamp(26px,5vw,64px)}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.footer-note{font-size:13px;line-height:1.7;color:var(--muted);max-width:34ch}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.footer-col-title{margin-bottom:12px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.18em;color:var(--cyan)}
.footer-col ul{display:grid;gap:9px}
.footer-link{display:inline-block;font-size:14px;color:rgba(242,247,247,.78);text-decoration:none;border-bottom:1px solid transparent;transition:color .15s var(--ease),border-color .15s var(--ease)}
.footer-link:hover{color:var(--lime);border-bottom-color:var(--lime)}
.footer-link--btn{font-family:inherit;text-align:left}
.footer-link--btn[aria-pressed="true"]{color:var(--lime);border-bottom-color:rgba(124,255,79,.6)}
.footer-contact{position:relative;z-index:1;max-width:var(--wrap);margin:clamp(28px,4vw,48px) auto 0;padding:18px clamp(16px,4vw,32px) 0;border-top:1px solid var(--line-dark);display:flex;flex-wrap:wrap;gap:10px 28px;font-size:13px;color:var(--muted)}
.footer-contact-item{display:inline-flex;align-items:baseline;gap:8px}
.footer-contact-item .label-mono{color:var(--lime)}
.footer-legal{position:relative;z-index:1;max-width:var(--wrap);margin:22px auto 0;padding:0 clamp(16px,4vw,32px);display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;color:var(--muted)}
.footer-legal p{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;max-width:none}

/* ---------- 11. 显现动效 ---------- */
html:not(.js-ready) [data-reveal]{opacity:1;translate:0 0}
[data-reveal]{opacity:0;translate:0 14px;transition:opacity .5s ease,translate .5s var(--ease)}
[data-reveal].is-visible{opacity:1;translate:0 0}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1100px){
  .nav-link::before{display:none}
  .nav-link{padding:8px 9px;font-size:13.5px}
  .tool-link{display:none}
}
@media (max-width:900px){
  :root{--header-h:62px;--header-h-compact:62px}
  html.is-nav-open,html.is-nav-open body{overflow:hidden}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:var(--header-h);left:0;right:0;margin-left:0;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:10px clamp(16px,5vw,28px) calc(26px + env(safe-area-inset-bottom,0px));
    background:rgba(11,15,18,.985);
    border-top:1px solid var(--line-dark);
    border-bottom:1px solid var(--line-dark);
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-12px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .primary-nav[data-open]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list > li + li{border-top:1px solid var(--line-soft)}
  .nav-link{justify-content:flex-start;padding:15px 4px;font-size:16px;border-radius:0;background:none !important}
  .nav-link:hover{color:var(--cyan);background:none}
  .nav-link[aria-current="page"]{color:var(--cyan);box-shadow:none;background:none}
  .nav-link[aria-current="page"]::after{content:"●";margin-left:auto;font-size:8px;color:var(--lime)}
  .nav-side{flex-direction:column;align-items:stretch;gap:12px;margin-top:16px;padding:18px 0 0;border-left:0;border-top:1px dashed var(--line-dark)}
  .tool-link{display:inline-block;padding:8px 2px;font-size:12px}
  .tool-switch{align-self:flex-start}
  .header-cta{justify-content:center;padding:13px 16px;font-size:14px}
  .brand-mark{font-size:16px}
}
@media (max-width:860px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .grid--stagger > *:nth-child(even){margin-top:0}
  .footer-inner{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .index-row{grid-template-columns:minmax(80px,110px) 1fr;row-gap:6px}
  .index-row > :last-child{grid-column:2}
}
@media (max-width:520px){
  body{font-size:15px}
  .footer-cols{grid-template-columns:1fr}
  .footer-legal{flex-direction:column}
  .btn{width:100%;justify-content:center}
  .btn--inline{width:auto}
}

/* ---------- 13. 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}
  [data-reveal],html:not(.js-ready) [data-reveal]{opacity:1 !important;translate:0 0 !important}
  .tag--update{animation:none !important}
  .btn:hover,.card:hover,.header-cta:hover{transform:none}
  .scroll-rail-fill{transition:none}
}