/* =========================================================
   YUN赛场 · /assets/site.css
   共享外壳：浮动胶囊导航 / 三段式页脚 / 海报式基础组件
   ========================================================= */

:root{
  /* 品牌色板 */
  --ink-900:#070B0F;
  --ink-800:#0B1116;
  --graphite:#161D24;
  --graphite-2:#1E272F;
  --pearl:#F5F7F4;
  --cyan:#00E5FF;
  --orange:#FF6B1A;
  --green:#B6FF2E;
  --steel:#2C5F6F;
  --amber:#FFB000;
  --indigo:#3A2E6E;
  --mist:#9AA8A6;

  /* 语义与状态 */
  --text:#F5F7F4;
  --text-muted:#A9B6B4;
  --line:rgba(245,247,244,.14);
  --line-strong:rgba(245,247,244,.30);
  --section-accent:var(--cyan);

  /* 字体 */
  --font-display:"Barlow Condensed","Oswald","Archivo Narrow","PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* 字号音阶 */
  --fs-eyebrow:.75rem;
  --fs-body:1rem;
  --fs-lead:1.125rem;
  --fs-h3:1.375rem;
  --fs-h2:clamp(1.75rem,3.4vw,2.75rem);
  --fs-h1:clamp(2.5rem,6vw,4.5rem);
  --fs-mega:clamp(3.5rem,11vw,11.25rem);

  /* 空间与形状 */
  --gutter:clamp(1rem,3vw,2.5rem);
  --shell:1320px;
  --radius-pill:999px;
  --radius-lg:18px;
  --radius-md:12px;
  --header-h:76px;
  --shadow-soft:0 18px 42px -26px rgba(0,0,0,.95);
  --t-fast:.18s ease;
  --t-base:.32s cubic-bezier(.2,.7,.3,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  min-height:100%;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1180px 620px at 88% -12%, rgba(0,229,255,.16), transparent 62%),
    radial-gradient(900px 520px at 2% 6%, rgba(255,107,26,.10), transparent 60%),
    radial-gradient(820px 820px at 50% 118%, rgba(58,46,110,.34), transparent 72%);
  background-repeat:no-repeat;
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;height:auto;display:block;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;}
::selection{background:var(--cyan);color:var(--ink-900);}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px;}

/* ---------- 中文排版基线 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0 0 .6em;
  color:var(--pearl);
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.04;
  letter-spacing:.01em;
  text-wrap:balance;
}
h1{font-size:var(--fs-h1);line-height:.98;}
h2{font-size:var(--fs-h2);}
h3{font-size:var(--fs-h3);font-family:var(--font-body);font-weight:700;line-height:1.35;letter-spacing:0;}
h4{font-size:1.0625rem;font-family:var(--font-body);font-weight:700;line-height:1.4;letter-spacing:0;}
p{margin:0 0 1.1em;}
p:last-child{margin-bottom:0;}
a{color:var(--cyan);text-decoration:none;text-underline-offset:3px;}
strong{font-weight:700;color:var(--pearl);}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0;}
.visually-hidden{
  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 ---------- */
.skip-link{
  position:fixed;
  top:.6rem;left:.6rem;
  z-index:400;
  transform:translateY(-180%);
  padding:.65rem 1.1rem;
  border-radius:var(--radius-pill);
  background:var(--cyan);
  color:var(--ink-900);
  font-weight:700;
  font-size:.875rem;
  transition:transform var(--t-fast);
}
.skip-link:focus,
.skip-link:focus-visible{
  transform:translateY(0);
  outline:2px solid var(--pearl);
  outline-offset:3px;
}

/* =========================================================
   页头：三座浮岛 + 顶部进度线
   ========================================================= */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:120;
  padding-top:calc(.75rem + env(safe-area-inset-top,0px));
}
.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:130;
  background:rgba(0,229,255,.12);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--green) 58%,var(--orange) 100%);
  transition:transform .09s linear;
}
.header-shell{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem .6rem;
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
}
.brand,
.primary-nav,
.header-actions,
.nav-toggle{
  background:rgba(7,11,15,.80);
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
}
.site-header.is-scrolled .brand,
.site-header.is-scrolled .primary-nav,
.site-header.is-scrolled .header-actions,
.site-header.is-scrolled .nav-toggle{
  background:rgba(7,11,15,.94);
  border-color:var(--line-strong);
  box-shadow:var(--shadow-soft);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  padding:.4rem 1rem .4rem .45rem;
  color:var(--pearl);
  flex:0 0 auto;
}
.brand-mark{
  position:relative;
  width:30px;height:30px;
  flex:0 0 auto;
  border-radius:9px;
  overflow:hidden;
  background:linear-gradient(150deg,var(--cyan) 0%,var(--steel) 64%,var(--ink-900) 100%);
  box-shadow:inset 0 0 0 1px rgba(245,247,244,.38);
}
.brand-mark::before{
  content:"";
  position:absolute;
  top:-40%;right:4px;
  width:7px;height:180%;
  background:var(--orange);
  transform:rotate(22deg);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:6px;bottom:6px;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--pearl);
}
.brand-text{
  font-family:var(--font-display);
  font-size:1.125rem;
  font-weight:800;
  letter-spacing:.08em;
  text-transform:uppercase;
  line-height:1;
}
.brand-accent{color:var(--cyan);letter-spacing:.04em;}

/* 主导航 */
.primary-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
  padding:.22rem;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:.1rem;
}
.nav-item{display:flex;}
.nav-link{
  position:relative;
  display:block;
  padding:.55rem .78rem;
  border-radius:var(--radius-pill);
  color:var(--text);
  font-size:.875rem;
  font-weight:600;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:color var(--t-fast),background-color var(--t-fast);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:.78rem;right:.78rem;bottom:.3rem;
  height:2px;
  background:var(--section-accent);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-base);
}
.nav-link:hover,
.nav-link:focus-visible{background:rgba(245,247,244,.08);color:var(--pearl);}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{
  color:var(--pearl);
  background:rgba(245,247,244,.10);
}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}

/* 右侧快速入口 */
.header-actions{
  display:flex;
  align-items:center;
  gap:.35rem;
  padding:.32rem;
  flex:0 0 auto;
}
.pill{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:.5rem .95rem;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:.8125rem;
  font-weight:700;
  letter-spacing:.03em;
  line-height:1.2;
  transition:background-color var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast);
}
.pill:hover{transform:translateY(-1px);}
.pill--cyan{background:var(--cyan);color:var(--ink-900);}
.pill--cyan:hover,.pill--cyan:focus-visible{background:var(--green);color:var(--ink-900);}
.pill--orange{
  background:transparent;
  color:var(--orange);
  border-color:rgba(255,107,26,.55);
}
.pill--orange:hover,.pill--orange:focus-visible{background:var(--orange);color:var(--ink-900);border-color:var(--orange);}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.55rem .95rem;
  color:var(--pearl);
  font-size:.8125rem;
  font-weight:700;
  letter-spacing:.06em;
  cursor:pointer;
}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;height:2px;
  background:var(--pearl);
  transition:background-color var(--t-fast);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  background:var(--pearl);
  transition:transform var(--t-base);
}
.nav-toggle-bars::before{top:-6px;}
.nav-toggle-bars::after{top:6px;}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent;}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg);}
.site-header[data-open="true"] .nav-toggle-label{color:var(--cyan);}

/* 主内容起始偏移 */
.site-main{padding-top:calc(var(--header-h) + 1rem);}
[id]{scroll-margin-top:calc(var(--header-h) + 24px);}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  background:var(--ink-900);
  border-top:1px solid var(--line);
  color:var(--text);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:linear-gradient(90deg,var(--cyan) 0 33%,var(--orange) 33% 66%,var(--green) 66% 100%);
}
.site-footer::after{
  content:"";
  position:absolute;
  right:-12%;top:-30%;
  width:min(520px,60%);
  aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle,rgba(0,229,255,.14),transparent 68%);
  pointer-events:none;
}
.footer-shell{
  position:relative;
  z-index:1;
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
  padding:clamp(2.5rem,6vw,4.5rem) 0 1.75rem;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);
  gap:clamp(1.5rem,4vw,4rem);
  padding-bottom:2.25rem;
  border-bottom:1px solid var(--line);
}
.footer-wordmark{
  margin:0;
  font-family:var(--font-display);
  font-size:clamp(2.5rem,7vw,5.25rem);
  font-weight:800;
  line-height:.88;
  letter-spacing:.02em;
  text-transform:uppercase;
  color:var(--pearl);
}
.footer-wordmark span{color:var(--cyan);letter-spacing:0;}
.footer-tag{
  margin:1rem 0 0;
  max-width:36ch;
  color:var(--text-muted);
  font-size:.95rem;
}
.footer-signals{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  margin-top:1.4rem;
}
.signal{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.3rem .7rem .3rem .55rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--text-muted);
}
.signal::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:currentColor;
}
.signal--cyan{color:var(--cyan);border-color:rgba(0,229,255,.35);}
.signal--orange{color:var(--orange);border-color:rgba(255,107,26,.35);}
.signal--green{color:var(--green);border-color:rgba(182,255,46,.35);}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1.5rem 2rem;
}
.footer-col-title{
  margin:0 0 1rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-list{display:grid;gap:.55rem;}
.footer-link{
  position:relative;
  display:inline-block;
  color:var(--pearl);
  font-size:.9375rem;
  padding-left:0;
  transition:color var(--t-fast),padding-left var(--t-fast);
}
.footer-link::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:0;height:1px;
  background:var(--cyan);
  transition:width var(--t-fast);
}
.footer-link:hover{color:var(--cyan);padding-left:.9rem;}
.footer-link:hover::before{width:.65rem;}
.footer-link:focus-visible{color:var(--cyan);outline-color:var(--cyan);}

.footer-contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:1.25rem 1.75rem;
  padding:2rem 0;
  border-bottom:1px solid var(--line);
}
.contact-row{
  display:flex;
  flex-direction:column;
  gap:.35rem;
  padding-left:.85rem;
  border-left:2px solid var(--steel);
}
.contact-row--note{border-left-color:var(--amber);}
.contact-label{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.contact-value{
  color:var(--pearl);
  font-size:.9125rem;
  line-height:1.55;
  word-break:break-word;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.75rem 1.5rem;
  padding-top:1.5rem;
}
.footer-legal{
  margin:0;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem .9rem;
  font-size:.75rem;
}
.link-inline{
  color:var(--text-muted);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  border-bottom:1px solid transparent;
  transition:color var(--t-fast),border-color var(--t-fast);
}
.link-inline:hover,.link-inline:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan);}

/* =========================================================
   通用布局与组件（供页面阶段复用）
   ========================================================= */
.shell{
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
}
.section{
  position:relative;
  padding:clamp(2.75rem,6vw,6rem) 0;
}
.section--alt{background:var(--graphite);}
.section--light{background:var(--pearl);color:var(--ink-900);}
.section--light h2,.section--light h3,.section--light h4{color:var(--ink-900);}
.section--light p,.section--light li{color:#243036;}
.section--light a{color:var(--steel);}
.section--light .eyebrow{color:var(--steel);}
.rule{border:0;border-top:1px solid var(--line);margin:0;}

.eyebrow{
  display:flex;
  align-items:center;
  gap:.6rem;
  margin:0 0 1rem;
  font-family:var(--font-mono);
  font-size:var(--fs-eyebrow);
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--section-accent);
}
.eyebrow::before{
  content:"";
  width:26px;height:2px;
  background:currentColor;
  flex:0 0 auto;
}
.display{
  font-family:var(--font-display);
  font-weight:800;
  line-height:.9;
  letter-spacing:.01em;
  text-transform:uppercase;
}
.section-head{max-width:62ch;margin-bottom:clamp(1.5rem,3vw,2.75rem);}
.section-title{
  font-family:var(--font-display);
  font-size:var(--fs-h2);
  font-weight:800;
  line-height:1.02;
  margin:0 0 .5rem;
}
.section-lead{
  margin:0;
  color:var(--text-muted);
  font-size:var(--fs-lead);
  line-height:1.65;
}
.section--light .section-lead{color:#3A4A50;}

/* 网格 */
.grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:start;}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.8rem 1.4rem;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  cursor:pointer;
  transition:background-color var(--t-fast),color var(--t-fast),border-color var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);
}
.btn:hover{transform:translateY(-2px);}
.btn--primary{background:var(--cyan);color:var(--ink-900);}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--green);box-shadow:0 10px 26px -14px rgba(0,229,255,.9);}
.btn--accent{background:var(--orange);color:var(--ink-900);}
.btn--accent:hover,.btn--accent:focus-visible{background:var(--amber);}
.btn--ghost{
  background:transparent;
  color:var(--pearl);
  border-color:var(--line-strong);
}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);}
.btn--sm{padding:.55rem 1rem;font-size:.8125rem;}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.25rem .65rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--text-muted);
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,255,.4);background:rgba(0,229,255,.08);}
.tag--orange{color:var(--orange);border-color:rgba(255,107,26,.4);background:rgba(255,107,26,.08);}
.tag--green{color:var(--green);border-color:rgba(182,255,46,.4);background:rgba(182,255,46,.08);}
.tag--mono{font-variant-numeric:tabular-nums;}

/* 数据 */
.data-figure{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(2.25rem,6vw,4.5rem);
  font-weight:700;
  line-height:.95;
  letter-spacing:-.02em;
  color:var(--cyan);
  font-variant-numeric:tabular-nums;
}
.data-label{
  display:block;
  margin-top:.4rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}

/* 卡片 */
.card{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.6rem);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background:rgba(22,29,36,.72);
  transition:border-color var(--t-base),transform var(--t-base),box-shadow var(--t-base);
}
.card:hover{border-color:rgba(0,229,255,.45);transform:translateY(-3px);box-shadow:var(--shadow-soft);}
.card--flat{background:transparent;border-color:var(--line);}
.card__title{
  margin:0 0 .4rem;
  font-family:var(--font-body);
  font-size:1.0625rem;
  font-weight:700;
  color:var(--pearl);
}
.card__meta{
  margin:0;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--mist);
  text-transform:uppercase;
}
.section--light .card{background:#fff;border-color:rgba(7,11,15,.12);}
.section--light .card__title{color:var(--ink-900);}
.section--light .card__meta{color:#5A6A70;}

/* 图片容器 */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:
    linear-gradient(140deg,rgba(0,229,255,.16),rgba(7,11,15,0) 45%),
    linear-gradient(320deg,rgba(255,107,26,.18),rgba(7,11,15,0) 52%),
    var(--graphite-2);
  aspect-ratio:16 / 9;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(245,247,244,.07) 0 1px,transparent 1px 9px);
  opacity:.6;
}
.media-frame--wide{aspect-ratio:16 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.media-frame__caption{
  position:absolute;
  left:0;bottom:0;
  z-index:1;
  margin:0;
  padding:.5rem .9rem;
  background:rgba(7,11,15,.82);
  border-top-right-radius:var(--radius-md);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:var(--pearl);
}

/* 面包屑 */
.breadcrumbs{padding:1rem 0 0;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.breadcrumb-item{display:flex;align-items:center;gap:.45rem;color:var(--mist);}
.breadcrumb-item:not(:last-child)::after{
  content:"/";
  color:var(--steel);
}
.breadcrumb-link{color:var(--text-muted);transition:color var(--t-fast);}
.breadcrumb-link:hover,.breadcrumb-link:focus-visible{color:var(--cyan);}
.breadcrumb-current{color:var(--pearl);}

/* 长文容器 */
.prose{
  max-width:68ch;
  font-size:1.0625rem;
  line-height:1.8;
}
.prose h2{margin-top:2.4em;font-size:clamp(1.5rem,2.6vw,2rem);}
.prose h3{margin-top:2em;}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.15em;list-style:disc;}
.prose ol{list-style:decimal;}
.prose li{margin-bottom:.5em;}
.prose a{border-bottom:1px solid rgba(0,229,255,.5);}
.prose a:hover{border-bottom-color:var(--cyan);}
.prose blockquote{
  margin:1.6em 0;
  padding:.9rem 0 .9rem 1.2rem;
  border-left:2px solid var(--orange);
  color:var(--pearl);
  font-size:1.0625rem;
}
.section--light .prose{color:#243036;}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1120px){
  .nav-link{padding:.5rem .58rem;font-size:.8125rem;}
  .nav-link::after{left:.58rem;right:.58rem;}
  .pill{padding:.45rem .72rem;font-size:.75rem;}
}

@media (max-width:960px){
  .header-shell{
    display:grid;
    grid-template-columns:minmax(0,1fr) auto;
    gap:.55rem;
  }
  .brand{justify-self:start;}
  .nav-toggle{display:inline-flex;justify-self:end;}
  .primary-nav,
  .header-actions{display:none;grid-column:1 / -1;}
  .site-header[data-open="true"] .primary-nav{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    padding:.5rem;
    border-radius:22px;
  }
  .site-header[data-open="true"] .primary-nav .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:.15rem;
  }
  .site-header[data-open="true"] .nav-item{display:block;}
  .site-header[data-open="true"] .nav-link{
    padding:.7rem .9rem;
    font-size:.9375rem;
  }
  .site-header[data-open="true"] .nav-link::after{
    left:.9rem;right:auto;
    width:20px;bottom:.5rem;
  }
  .site-header[data-open="true"] .header-actions{
    display:flex;
    flex-wrap:wrap;
    justify-content:flex-start;
    padding:.4rem;
    border-radius:22px;
  }
  .site-header[data-open="true"] .header-actions .pill{flex:1 1 auto;}

  .footer-top{grid-template-columns:minmax(0,1fr);}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--split{grid-template-columns:minmax(0,1fr);}
}

@media (max-width:640px){
  :root{--header-h:70px;}
  .brand-text{font-size:1rem;}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:1.5rem;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr);}
  .section-lead{font-size:1rem;}
  .prose{font-size:1rem;}
  .media-frame--tall{aspect-ratio:4 / 5;}
}

@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;
  }
  .card:hover,.btn:hover,.pill:hover{transform:none;}
  .scroll-progress-bar{transition:none;}
}