/* ============================================================
   博鱼赛场 · 共享样式 /assets/site.css
   水下光影 × 赛道灯光 / 侧边导览骨架 / 波浪过渡
   ============================================================ */

:root{
  --ink-900:#05192B;
  --ink-700:#0B2C4A;
  --ink-500:#1C6E96;
  --cyan-400:#35E0CE;
  --orange-500:#FF6A2B;
  --orange-200:#FFC7A8;
  --paper:#F8FBFF;
  --mist:#E6F2F5;
  --slate-600:#45607A;

  --fg:var(--ink-700);
  --muted:var(--slate-600);
  --line:rgba(11,44,74,.14);
  --line-soft:rgba(11,44,74,.08);
  --line-cyan:rgba(53,224,206,.42);

  --radius-xs:4px;
  --radius-sm:10px;
  --radius-md:20px;
  --radius-lg:36px;
  --radius-xl:72px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.28s;

  --shell:1320px;
  --gutter:clamp(18px,4vw,48px);
  --rail:220px;
  --header-h:92px;

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shadow-soft:0 18px 44px -28px rgba(5,25,43,.45);
  --shadow-pill:0 14px 36px -22px rgba(5,25,43,.6);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;}
ul[class],ol[class]{list-style:none;}
img,svg,video{max-width:100%;}
img{height:auto;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:inherit;text-decoration:none;}
input,textarea,select{font:inherit;color:inherit;}
table{border-collapse:collapse;width:100%;}

/* ---------- 基础排版（中文优先） ---------- */
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  color:var(--fg);
  background:var(--paper);
  padding-top:var(--header-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{
  line-height:1.22;
  font-weight:700;
  color:var(--ink-900);
  letter-spacing:-.01em;
}
h1{font-size:clamp(32px,4.6vw,64px);font-weight:900;letter-spacing:-.02em;line-height:1.1;}
h2{font-size:clamp(24px,3vw,40px);font-weight:700;line-height:1.18;}
h3{font-size:clamp(19px,2vw,28px);}
h4{font-size:clamp(17px,1.5vw,21px);}
p{text-wrap:pretty;}
strong,b{font-weight:700;color:var(--ink-900);}
small{font-size:.82em;}
hr{border:0;border-top:1px solid var(--line);margin:0;}

:focus-visible{
  outline:2px solid var(--cyan-400);
  outline-offset:3px;
  border-radius:6px;
}

.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:absolute;left:50%;top:0;
  transform:translate(-50%,-160%);
  z-index:120;
  padding:11px 22px;
  border-radius:0 0 16px 16px;
  background:var(--ink-900);
  color:var(--paper);
  font:700 14px/1 var(--font-sans);
  letter-spacing:.04em;
  transition:transform .24s var(--ease);
}
.skip-link:focus-visible{transform:translate(-50%,0);outline-offset:-3px;}

/* ---------- 排版工具 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);
  font-size:12px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-500);
}
.eyebrow::before{
  content:"";width:9px;height:9px;border-radius:2px;
  background:linear-gradient(135deg,var(--cyan-400),var(--orange-500));
  transform:skewX(-8deg);
}
.display{
  font-size:clamp(38px,7vw,88px);
  font-weight:900;
  line-height:1.02;
  letter-spacing:-.025em;
  color:var(--ink-900);
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.lead{
  font-size:clamp(17px,1.6vw,21px);
  line-height:1.8;
  color:var(--ink-700);
  max-width:34em;
}
.prose{max-width:36em;}
.prose > * + *{margin-top:1.15em;}
.prose h3{margin-top:1.9em;}
.prose p{color:var(--ink-700);}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.keyword{
  font-weight:700;color:var(--ink-900);
  background:linear-gradient(transparent 62%,rgba(53,224,206,.6) 62%);
  padding:0 .1em;
}
.meta-line{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;
  font-family:var(--font-mono);font-size:12.5px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);
}
.divider{border:0;border-top:1px solid var(--line);margin:0;}

/* ---------- 布局骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.layout-rail{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:clamp(24px,4vw,64px);
  align-items:start;
}
.grid{display:grid;gap:clamp(16px,2.4vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);}

/* ---------- 侧边导览轨道 ---------- */
.rail{
  position:sticky;
  top:calc(var(--header-h) + 28px);
  align-self:start;
  display:flex;flex-direction:column;gap:22px;
  padding:22px 18px 22px 0;
  border-right:1px solid var(--line-soft);
}
.rail__mark{
  font-family:var(--font-mono);
  font-size:11px;font-weight:600;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink-500);
}
.rail__map{display:flex;flex-direction:column;gap:4px;}
.rail__link{
  position:relative;
  display:flex;align-items:baseline;gap:10px;
  padding:7px 10px 7px 14px;
  border-radius:0 999px 999px 0;
  font-size:14px;line-height:1.5;color:var(--muted);
  transition:color .24s var(--ease),background .24s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:0;top:50%;
  width:3px;height:0;border-radius:3px;
  background:linear-gradient(180deg,var(--cyan-400),var(--orange-500));
  transform:translateY(-50%);
  transition:height .28s var(--ease);
}
.rail__link:hover{color:var(--ink-900);background:rgba(53,224,206,.1);}
.rail__link[aria-current="true"]{
  color:var(--ink-900);font-weight:700;
  background:rgba(53,224,206,.16);
}
.rail__link[aria-current="true"]::before{height:60%;}
.rail__progress{
  height:3px;border-radius:3px;background:rgba(11,44,74,.1);overflow:hidden;
}
.rail__progress > span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
  transition:width .2s linear;
}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:var(--ink-700);
  --btn-fg:#fff;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;
  border-radius:999px;
  border:1px solid transparent;
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-sans);
  font-size:15px;font-weight:700;line-height:1.25;
  letter-spacing:.01em;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),
             background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}
.btn--accent{
  --btn-bg:linear-gradient(135deg,#FF6A2B 0%,#FF8A4D 62%,#FFB07C 100%);
  --btn-fg:#fff;
  box-shadow:0 14px 28px -16px rgba(255,106,43,.95);
}
.btn--accent:hover{box-shadow:0 18px 34px -14px rgba(255,106,43,.85);}
.btn--ghost{
  --btn-bg:transparent;
  --btn-fg:var(--ink-700);
  border-color:rgba(11,44,74,.22);
}
.btn--ghost:hover{border-color:var(--cyan-400);color:var(--ink-900);background:rgba(53,224,206,.1);}
.btn--quiet{
  --btn-bg:rgba(53,224,206,.16);
  --btn-fg:var(--ink-900);
}
.btn--quiet:hover{--btn-bg:rgba(53,224,206,.3);}
.btn--block{display:flex;width:100%;}

/* ---------- 分区背景 ---------- */
.surface{position:relative;}
.surface--deep{
  background:radial-gradient(130% 140% at 8% 0%,#0B2C4A 0%,#05192B 64%);
  color:#D6E7F1;
}
.surface--deep h1,.surface--deep h2,.surface--deep h3,.surface--deep h4{color:#F4FBFF;}
.surface--deep .prose p,.surface--deep .lead,.surface--deep p{color:#B7D2E0;}
.surface--deep .eyebrow{color:var(--cyan-400);}
.surface--deep .divider,.surface--deep hr{border-color:rgba(53,224,206,.2);}
.surface--mist{background:var(--mist);}

/* ---------- 波浪分割线 ---------- */
.wave-divider{
  display:block;
  width:100%;
  line-height:0;
  overflow:hidden;
  pointer-events:none;
}
.wave-divider svg{display:block;width:100%;height:clamp(36px,5vw,76px);}
.wave-divider--flip svg{transform:scaleX(-1);}

/* ---------- 卡片 / 专题研究板 ---------- */
.board{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-lg) var(--radius-xs) var(--radius-lg) var(--radius-lg);
  padding:clamp(20px,2.6vw,32px);
  box-shadow:var(--shadow-soft);
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
}
.board:hover{transform:translateY(-4px);border-color:var(--line-cyan);}
.board__num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(28px,3vw,44px);
  font-weight:700;line-height:1;
  color:var(--orange-500);
  letter-spacing:-.02em;
  margin-bottom:14px;
}
.board__title{font-size:clamp(18px,1.6vw,22px);font-weight:700;color:var(--ink-900);}
.board__meta{
  margin-top:10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;
  color:var(--muted);
}

.stat{display:flex;flex-direction:column;gap:6px;}
.stat__num{
  font-family:var(--font-mono);
  font-size:clamp(34px,5vw,72px);
  font-weight:700;line-height:.95;
  letter-spacing:-.03em;
  color:var(--ink-900);
}
.stat__num em{font-style:normal;color:var(--orange-500);}
.stat__label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--muted);
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:999px;
  background:var(--mist);
  color:var(--ink-700);
  font-family:var(--font-mono);font-size:11.5px;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;
}
.tag--cyan{background:rgba(53,224,206,.2);color:#0C5A5A;}

.note{
  padding:14px 18px;
  border-left:3px solid var(--orange-500);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  background:rgba(255,199,168,.22);
  font-size:15px;line-height:1.8;color:var(--ink-700);
}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:700;color:var(--ink-900);
  border-bottom:1px solid var(--line-cyan);
  padding-bottom:2px;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.link-arrow::after{
  content:"→";
  font-family:var(--font-mono);
  color:var(--orange-500);
  transition:transform .24s var(--ease);
}
.link-arrow:hover{color:var(--orange-500);border-color:var(--orange-500);}
.link-arrow:hover::after{transform:translateX(5px);}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:linear-gradient(155deg,#CFE7EF 0%,#9FCBDD 52%,#7FB6CE 100%);
  isolation:isolate;
}
.media::after{
  content:"";
  position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    radial-gradient(80% 90% at 16% 6%,rgba(53,224,206,.34),transparent 58%),
    radial-gradient(72% 84% at 90% 94%,rgba(255,106,43,.26),transparent 60%);
}
.media__img{
  position:relative;z-index:0;
  display:block;width:100%;height:100%;
  object-fit:cover;
}
.media--wide{aspect-ratio:16/9;}
.media--tall{aspect-ratio:4/5;}
.media--square{aspect-ratio:1/1;}
.media__caption{
  position:relative;z-index:2;
  margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--muted);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);
}
.breadcrumb li{display:flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"/";color:var(--line);}
.breadcrumb a{color:var(--ink-500);transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--orange-500);}

/* ============================================================
   头部 · 悬浮胶囊 + 阅读进度
   ============================================================ */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:90;
  padding:14px var(--gutter) 0;
  transition:padding .32s var(--ease);
}
.header-shell{
  position:relative;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
}
.nav-pill{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  padding:9px 12px 9px 16px;
  border-radius:999px;
  background:rgba(248,251,255,.9);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border:1px solid rgba(11,44,74,.1);
  box-shadow:var(--shadow-pill);
  transition:padding .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease);
}
.nav-pill::before{
  content:"";
  position:absolute;left:16px;right:auto;top:-1px;
  width:72px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
  opacity:.9;
}
.site-header.is-scrolled{padding-top:8px;}
.site-header.is-scrolled .nav-pill{
  padding:5px 10px 5px 12px;
  box-shadow:0 16px 40px -24px rgba(5,25,43,.75);
  border-color:rgba(11,44,74,.16);
}

/* 品牌 */
.brand{
  display:flex;align-items:center;gap:10px;
  flex:0 0 auto;
}
.brand-mark{
  display:grid;place-items:center;
  width:40px;height:40px;
  border-radius:14px;
  background:linear-gradient(140deg,#FF6A2B 0%,#FF9152 60%,#FFC7A8 100%);
  color:#fff;
  font-family:var(--font-mono);
  font-size:15px;font-weight:700;letter-spacing:.02em;
  transform:skewX(-7deg);
  box-shadow:0 8px 18px -10px rgba(255,106,43,.95);
  transition:width .3s var(--ease),height .3s var(--ease),border-radius .3s var(--ease),font-size .3s var(--ease);
}
.site-header.is-scrolled .brand-mark{
  width:34px;height:34px;border-radius:12px;font-size:13px;
}
.brand-text{display:flex;flex-direction:column;line-height:1.1;gap:3px;}
.brand-name{
  font-size:17px;font-weight:900;color:var(--ink-900);
  letter-spacing:.02em;
}
.brand-tag{
  font-family:var(--font-mono);
  font-size:9.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-500);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;gap:8px;
  padding:9px 14px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--paper);
  color:var(--ink-700);
  font-size:13px;font-weight:700;letter-spacing:.08em;
  cursor:pointer;
  transition:border-color .24s var(--ease),color .24s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--ink-900);}
.nav-toggle-bars{
  position:relative;
  width:16px;height:2px;border-radius:2px;
  background:currentColor;
  transition:background .24s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;
  width:16px;height:2px;border-radius:2px;
  background:currentColor;
  transition:transform .28s var(--ease);
}
.nav-toggle-bars::before{top:-5px;}
.nav-toggle-bars::after{top:5px;}
.site-header[data-open="true"] .nav-toggle{border-color:var(--orange-500);color:var(--orange-500);}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent;}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}

/* 导航主体 */
.nav-wrap{
  display:flex;
  align-items:center;
  gap:clamp(6px,1vw,16px);
  margin-left:auto;
  min-width:0;
}
.nav-list{display:flex;align-items:center;gap:2px;}
.nav-item{display:flex;}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 12px;
  border-radius:999px;
  font-size:15px;font-weight:500;
  color:var(--ink-700);
  white-space:nowrap;
  transition:color .22s var(--ease),background-color .22s var(--ease);
}
.nav-link:hover{color:var(--ink-900);background:var(--mist);}
.nav-link[aria-current="page"]{
  color:var(--ink-900);
  font-weight:700;
  background:rgba(53,224,206,.16);
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;left:12px;right:12px;bottom:5px;
  height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
}
.nav-actions{
  display:flex;align-items:center;gap:8px;
  margin-left:clamp(6px,1.2vw,18px);
}
.nav-actions .btn{padding:10px 18px;font-size:14px;}

/* 阅读进度 */
.read-progress{
  width:calc(100% - 32px);
  height:3px;
  margin:9px auto 0;
  border-radius:3px;
  background:rgba(11,44,74,.09);
  overflow:hidden;
  opacity:0;
  visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s var(--ease);
}
.site-header.is-scrolled .read-progress{opacity:1;visibility:visible;}
.read-progress-fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan-400) 0%,#6FE9DC 40%,var(--orange-500) 100%);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,132px);
  padding-bottom:clamp(24px,3vw,40px);
  background:
    radial-gradient(120% 120% at 88% 8%,rgba(255,106,43,.16),transparent 52%),
    radial-gradient(90% 100% at 6% 96%,rgba(28,110,150,.42),transparent 58%),
    linear-gradient(180deg,#0B2C4A 0%,#05192B 78%);
  color:#CFE4EE;
  overflow:hidden;
}
.site-footer::after{
  content:"";
  position:absolute;
  left:-8%;bottom:-38%;
  width:56%;height:70%;
  border-radius:50%;
  background:radial-gradient(closest-side,rgba(53,224,206,.14),transparent 72%);
  pointer-events:none;
}
.footer-wave{
  display:block;
  line-height:0;
  margin-top:-1px;
}
.footer-wave svg{display:block;width:100%;height:clamp(40px,6vw,76px);}
.footer-wave-back{fill:rgba(53,224,206,.18);}
.footer-wave-front{fill:var(--paper);}

.footer-shell{
  position:relative;z-index:1;
  width:100%;max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(260px,1.5fr) repeat(3,minmax(120px,1fr));
  gap:clamp(26px,4vw,56px);
  padding:clamp(30px,4vw,56px) 0 clamp(28px,3.4vw,44px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px;}
.footer-logo{display:inline-flex;align-items:center;gap:10px;}
.footer-mark{
  display:grid;place-items:center;
  width:38px;height:38px;border-radius:13px;
  background:linear-gradient(140deg,#FF6A2B,#FF9152 60%,#FFC7A8);
  color:#fff;
  font-family:var(--font-mono);font-size:14px;font-weight:700;
  transform:skewX(-7deg);
}
.footer-name{font-size:17px;font-weight:900;color:#F4FBFF;letter-spacing:.02em;}
.footer-blurb{
  max-width:30em;
  font-size:14.5px;line-height:1.85;
  color:#9FBCCD;
}
.footer-cta{margin-top:2px;}
.footer-version{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:#6E93A8;
}
.footer-col{display:flex;flex-direction:column;gap:14px;}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:11.5px;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan-400);
}
.footer-list{display:flex;flex-direction:column;gap:10px;}
.footer-list a{
  font-size:14.5px;color:#CFE4EE;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.footer-list a:hover{color:#fff;border-color:var(--orange-500);}

.footer-contact{
  display:flex;flex-wrap:wrap;gap:6px 26px;
  padding:20px 0;
  border-top:1px solid rgba(53,224,206,.18);
}
.footer-contact-line{
  font-family:var(--font-mono);
  font-size:12.5px;letter-spacing:.03em;
  color:#8FB2C6;
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;
  padding-top:18px;
  border-top:1px solid rgba(53,224,206,.12);
}
.footer-copy,.footer-legal{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.08em;
  color:#6E93A8;
}
.footer-legal{color:#8FB2C6;}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1240px){
  .nav-link{font-size:14px;padding:8px 10px;}
  .nav-actions .btn--ghost{display:none;}
}
@media (max-width:1080px){
  :root{--header-h:82px;--rail:180px;}
  .site-header{padding:10px var(--gutter) 0;}
  .nav-toggle{display:inline-flex;}
  .nav-pill{padding:8px 10px 8px 14px;}
  .nav-wrap{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:14px;
    border-radius:26px;
    background:var(--paper);
    border:1px solid rgba(11,44,74,.12);
    box-shadow:0 28px 60px -32px rgba(5,25,43,.7);
    max-height:calc(100vh - var(--header-h) - 40px);
    overflow-y:auto;
  }
  .site-header[data-open="true"] .nav-wrap{display:flex;}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;}
  .nav-link{
    display:block;
    padding:12px 16px;
    border-radius:14px;
    font-size:16px;
  }
  .nav-link[aria-current="page"]::after{left:16px;right:auto;width:26px;bottom:8px;}
  .nav-actions{
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    margin:14px 0 0;
    padding-top:14px;
    border-top:1px solid var(--line-soft);
  }
  .nav-actions .btn{width:100%;padding:12px 18px;font-size:15px;}
  .nav-actions .btn--ghost{display:inline-flex;}
  .read-progress{margin-top:7px;}
}
@media (max-width:960px){
  .layout-rail{grid-template-columns:minmax(0,1fr);}
  .rail{display:none;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--split{grid-template-columns:minmax(0,1fr);}
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-brand{grid-column:1 / -1;}
}
@media (max-width:720px){
  :root{--header-h:76px;}
  body{font-size:16px;line-height:1.82;}
  .brand-tag{display:none;}
  .brand-name{font-size:16px;}
  .display{transform:skewX(-1.5deg);}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .footer-top{grid-template-columns:minmax(0,1fr);gap:26px;}
  .footer-contact{flex-direction:column;gap:4px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px;}
  .btn{padding:12px 20px;}
}

/* ============================================================
   可访问性降级
   ============================================================ */
@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;
  }
  .btn:hover,.board:hover{transform:none;}
  .link-arrow:hover::after{transform:none;}
  .read-progress-fill{transition:none;}
}