@import url('https://fonts.googleapis.com/css2?family=Newsreader:wght@400;500;600;700&family=Roboto:wght@300;400;500;700&display=swap');

:root{
  --paper:#ffffff;
  --wash:#f5f5f5;
  --ink:#1f1f1f;
  --soft:#262626;
  --muted:#5f5f5f;
  --line:rgba(31,31,31,.12);
  --rail-w:230px;
  --ticker-h:40px;
  --serif:'Newsreader',Georgia,'Songti SC','SimSun',serif;
  --sans:'Roboto',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --e1:0 1px 2px rgba(31,31,31,.06),0 2px 6px rgba(31,31,31,.05);
  --e2:0 4px 10px rgba(31,31,31,.07),0 12px 26px rgba(31,31,31,.06);
  --e3:0 10px 24px rgba(31,31,31,.09),0 24px 52px rgba(31,31,31,.09);
  --e4:0 18px 44px rgba(31,31,31,.13),0 48px 96px rgba(31,31,31,.11);
}

*,*::before,*::after{box-sizing:border-box;}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  padding-top:var(--ticker-h);
  padding-left:var(--rail-w);
  background-color:var(--paper);
  background-image:radial-gradient(circle at 1px 1px,rgba(31,31,31,.055) 1px,transparent 0);
  background-size:26px 26px;
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
}

img{max-width:100%;height:auto;}

a{color:inherit;}

.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;
}

/* 顶部细条 */
.ticker{
  position:fixed;top:0;left:0;right:0;z-index:60;
  height:var(--ticker-h);
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:0 clamp(.9rem,2vw,1.4rem);
  background:var(--ink);color:var(--paper);
}
.ticker-word{
  font-family:var(--serif);font-size:.86rem;letter-spacing:.36em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.ticker-top{
  display:inline-flex;align-items:center;height:var(--ticker-h);
  padding:0 .2rem;font-size:.74rem;letter-spacing:.14em;color:var(--paper);
  text-decoration:none;opacity:.78;white-space:nowrap;
}
.ticker-top:hover{opacity:1;}

/* 左侧竖向导航 */
.rail{
  position:fixed;top:var(--ticker-h);left:0;bottom:0;z-index:50;
  width:var(--rail-w);
  display:flex;flex-direction:column;gap:1rem;
  padding:1.1rem .9rem 1.5rem;
  border-right:1px solid var(--line);
  background:linear-gradient(180deg,#ffffff 0%,#fafafa 100%);
}
.rail-top{display:flex;align-items:center;}
.rail-brand{
  width:44px;height:44px;flex:0 0 44px;
  display:grid;place-items:center;
  border-radius:15px;background:var(--ink);color:var(--paper);
  font-family:var(--serif);font-size:1.3rem;line-height:1;
  text-decoration:none;box-shadow:var(--e2);
  transition:transform .25s ease,box-shadow .25s ease;
}
.rail-brand:hover{transform:translateY(-2px);box-shadow:var(--e3);}
.rail-mark{width:44px;height:44px;border-radius:15px;object-fit:cover;display:block;}

.rail-nav{flex:1 1 auto;min-height:0;}
.rail-scroll{
  display:flex;flex-direction:column;gap:.15rem;
  counter-reset:rail;height:100%;overflow-y:auto;padding-bottom:.5rem;
}
.rail-group{display:flex;flex-direction:column;gap:.3rem;padding-block:.4rem;}
.rail-group + .rail-group{border-top:1px solid var(--line);}
.rail-link{
  counter-increment:rail;
  display:flex;align-items:center;gap:.55rem;
  min-height:44px;padding:.4rem .7rem;
  border-radius:14px;background:var(--paper);
  box-shadow:var(--e1);text-decoration:none;
  font-size:.94rem;color:var(--ink);
  transition:transform .22s ease,box-shadow .22s ease;
}
.rail-link::before{
  content:counter(rail,decimal-leading-zero);
  font-size:.66rem;letter-spacing:.08em;color:var(--muted);
}
.rail-link:hover{transform:translateX(4px);box-shadow:var(--e3);}

/* 主体 */
main{
  max-width:1180px;margin:0 auto;
  padding:clamp(1.1rem,3vw,2.2rem) clamp(1rem,3vw,2.4rem) 4rem;
}

/* 首屏 */
.hero{
  position:relative;overflow:hidden;
  min-height:45vh;
  display:flex;flex-direction:column;justify-content:center;
  padding:clamp(1.4rem,4vw,3.4rem);
  border-radius:32px;
  background-image:
    radial-gradient(circle at 1px 1px,rgba(31,31,31,.14) 1px,transparent 0),
    linear-gradient(142deg,#ffffff 0%,#f2f2f2 100%);
  background-size:22px 22px,auto;
  box-shadow:var(--e3);
  margin-bottom:clamp(1.4rem,3vw,2.4rem);
}
.hero-copy{position:relative;z-index:3;}
.hero h1{
  margin:0;
  font-family:var(--serif);font-weight:600;
  font-size:clamp(2.3rem,6.2vw,5rem);
  line-height:1.03;letter-spacing:-.03em;
  max-width:20ch;text-wrap:balance;
}
.hero-lede{
  margin:1rem 0 0;max-width:44ch;
  font-family:var(--serif);font-size:1.05rem;line-height:1.7;color:var(--muted);
}
.hero-veil{
  position:absolute;inset:0;margin:0;z-index:1;pointer-events:none;
}
.hero-sheet{
  position:absolute;border-radius:26px;
  background:rgba(255,255,255,.6);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:var(--e2);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.sheet-a{width:150px;height:190px;right:12%;top:16%;transform:rotate(5deg);}
.sheet-b{width:120px;height:150px;right:26%;top:44%;transform:rotate(-6deg);}
.sheet-c{width:86px;height:108px;right:6%;top:58%;transform:rotate(9deg);}

/* 正文与侧栏 */
.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr) 17rem;
  gap:clamp(1.1rem,2.4vw,1.8rem);
  align-items:start;
}
.column{grid-column:1;grid-row:1;min-width:0;}

.column > div{
  position:relative;z-index:1;
  background:var(--paper);
  border-radius:28px;
  padding:clamp(1.25rem,3vw,2.4rem);
  box-shadow:var(--e2);
  margin:0 0 1.2rem;
  scroll-margin-top:calc(var(--ticker-h) + 1rem);
  transition:box-shadow .3s ease,transform .3s ease;
}
.column > div + div{margin-top:-.3rem;}
.column > div:hover{box-shadow:var(--e3);transform:translateY(-3px);z-index:4;}

.column h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(1.45rem,2.8vw,2rem);
  line-height:1.16;letter-spacing:-.02em;margin:0 0 .7rem;
}
.column h3{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(1.12rem,1.8vw,1.35rem);line-height:1.3;margin:1.4rem 0 .5rem;
}
.column hr{border:0;border-top:1px solid var(--line);margin:0 0 1rem;height:0;}
.column p,.column li{
  font-family:var(--serif);font-size:1.06rem;line-height:1.78;color:var(--soft);
}
.column p{margin:0 0 .95rem;}
.column ul,.column ol{padding-left:1.25rem;margin:0 0 1rem;}
.column li{margin:.25rem 0;}
.column a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;}
.column strong{color:var(--ink);}
.column blockquote{
  margin:1.2rem 0;padding:.85rem 1.1rem;
  border-left:3px solid var(--ink);border-radius:0 16px 16px 0;
  background:var(--wash);
}
.column blockquote p:last-child{margin:0;}
.column figure{
  margin:1.1rem 0;padding:.75rem;
  background:var(--wash);border-radius:20px;
  box-shadow:inset 0 0 0 1px var(--line);
}
.column figure img{border-radius:14px;display:block;}
.column figcaption{font-size:.85rem;color:var(--muted);padding:.5rem .2rem 0;}
.column img{border-radius:18px;display:block;box-shadow:var(--e1);}
.column time{font-family:var(--sans);font-size:.84rem;color:var(--muted);letter-spacing:.04em;}
.column table{width:100%;border-collapse:collapse;font-size:.97rem;margin:1rem 0;}
.column th,.column td{border-bottom:1px solid var(--line);padding:.55rem;text-align:left;}
.column th{font-family:var(--sans);font-size:.82rem;letter-spacing:.08em;color:var(--muted);}

/* 侧栏 */
.aside-card{
  grid-column:2;grid-row:1;align-self:start;
  position:sticky;top:calc(var(--ticker-h) + 1.1rem);
  background:var(--paper);border-radius:24px;
  padding:1rem 1.1rem 1.1rem;box-shadow:var(--e2);
}
.aside-card h2{font-family:var(--serif);font-size:1rem;font-weight:600;margin:0 0 .45rem;}
.aside-card hr{border:0;border-top:1px solid var(--line);margin:0 0 .55rem;height:0;}
.toc{list-style:none;margin:0;padding:0;counter-reset:toc;}
.toc a{
  counter-increment:toc;
  display:flex;align-items:center;gap:.5rem;
  min-height:40px;padding:.2rem 0;
  font-size:.92rem;color:var(--ink);text-decoration:none;
}
.toc a::before{content:counter(toc,decimal-leading-zero);font-size:.66rem;color:var(--muted);}
.toc a:hover{text-decoration:underline;}

/* 页脚 */
.foot{
  display:grid;grid-template-columns:1.25fr 1fr 1fr;
  gap:clamp(1rem,2vw,1.6rem);
  padding:clamp(1.6rem,3vw,2.6rem) clamp(1rem,3vw,2.4rem) 1.4rem;
  background:var(--wash);
  border-top:1px solid var(--line);
}
.foot > div{
  background:var(--paper);border-radius:28px;
  padding:1.2rem 1.25rem;box-shadow:var(--e1);
}
.foot h2{font-family:var(--serif);font-size:1.05rem;font-weight:600;margin:0 0 .5rem;letter-spacing:-.01em;}
.foot hr{border:0;border-top:1px solid var(--line);margin:0 0 .75rem;height:0;}
.foot-desc{font-family:var(--serif);font-size:.97rem;line-height:1.72;color:var(--muted);margin:0;}
.foot dl{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.35rem 1rem;margin:0;}
.foot dt{font-size:.76rem;letter-spacing:.14em;color:var(--muted);padding-top:.55rem;}
.foot dd{margin:0;display:flex;flex-direction:column;}
.foot dd a{
  display:inline-flex;align-items:center;min-height:40px;
  font-size:.95rem;color:var(--ink);text-decoration:none;
}
.foot dd a:hover{text-decoration:underline;}
.sub-form{display:flex;flex-wrap:wrap;gap:.5rem;}
.sub-form input{
  flex:1 1 8rem;min-height:44px;min-width:0;
  border:1px solid var(--line);border-radius:14px;
  background:var(--paper);color:var(--ink);
  font:inherit;padding:0 .8rem;
}
.sub-form input:focus{outline:2px solid var(--ink);outline-offset:1px;}
.sub-form button{
  min-height:44px;padding:0 1.15rem;border:0;border-radius:14px;
  background:var(--ink);color:var(--paper);font:inherit;cursor:pointer;
  box-shadow:var(--e2);transition:box-shadow .25s ease,transform .25s ease;
}
.sub-form button:hover{box-shadow:var(--e3);transform:translateY(-1px);}
.foot-base{
  grid-column:1/-1;text-align:center;
  font-size:.82rem;color:var(--muted);padding-top:.4rem;
}
.foot-base p{margin:0;}

/* 回到顶部 */
.to-top{
  position:fixed;right:1rem;bottom:1rem;z-index:70;
  min-height:44px;padding:0 1.1rem;border:0;border-radius:22px;
  background:var(--ink);color:var(--paper);
  font-family:var(--sans);font-size:.85rem;cursor:pointer;
  box-shadow:var(--e4);
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity .3s ease,transform .3s ease;
}
.to-top.is-on{opacity:1;transform:none;pointer-events:auto;}

/* 入场 */
.js .reveal{transition:opacity .62s ease,transform .62s cubic-bezier(.22,.61,.36,1);}
.js .reveal:not(.is-in){opacity:0;transform:translateY(20px);}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .js .reveal,.js .reveal:not(.is-in){opacity:1;transform:none;transition:none;}
  .column > div:hover{transform:none;}
  .rail-link:hover{transform:none;}
}

/* 窄屏 */
@media (max-width:960px){
  body{padding-top:0;padding-left:0;}
  .ticker{position:static;}
  .rail{
    position:static;width:auto;bottom:auto;
    border-right:0;border-bottom:1px solid var(--line);
    padding:.6rem .9rem .5rem;gap:.5rem;
    background:var(--paper);
  }
  .rail-top{padding-bottom:.4rem;}
  .rail-nav{flex:0 0 auto;}
  .rail-scroll{
    flex-direction:row;align-items:center;
    overflow-x:auto;overflow-y:hidden;
    gap:.15rem;padding-bottom:.35rem;
    -webkit-overflow-scrolling:touch;
  }
  .rail-group{flex-direction:row;align-items:center;gap:.15rem;padding-block:0;}
  .rail-group + .rail-group{border-top:0;border-left:1px solid var(--line);padding-left:.45rem;margin-left:.15rem;}
  .rail-link{white-space:nowrap;min-height:44px;padding:.4rem .7rem;font-size:.9rem;}
  .rail-link:hover{transform:none;}
  main{padding:1rem .9rem 3rem;}
  .hero{min-height:45vh;border-radius:26px;padding:1.3rem;}
  .hero h1{font-size:clamp(2rem,9vw,3rem);}
  .sheet-a{right:8%;top:8%;width:110px;height:140px;opacity:.8;}
  .sheet-b{display:none;}
  .sheet-c{display:none;}
  .stage{display:block;}
  .aside-card{position:static;margin-top:1rem;border-radius:22px;}
  .column > div{border-radius:24px;margin-bottom:1rem;}
  .column > div + div{margin-top:0;}
  .foot{grid-template-columns:1fr;padding:1.2rem .9rem 1rem;}
  .foot dl{grid-template-columns:1fr;}
  .foot dt{padding-top:.35rem;}
  .to-top{right:.75rem;bottom:.75rem;}
}

@media (max-width:420px){
  .ticker-word{font-size:.78rem;letter-spacing:.2em;}
  .hero h1{font-size:clamp(1.85rem,10vw,2.6rem);}
}

button[aria-expanded]{min-width:44px;min-height:44px}