@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@300;400;500;600;700&family=Orbitron:wght@400;500;600;700&display=swap');
:root{
  --ink:#000000;
  --paper:#f4f3ef;
  --paper-2:#ffffff;
  --line:rgba(0,0,0,.16);
  --line-soft:rgba(0,0,0,.08);
  --ghost:rgba(0,0,0,.07);
  --glass:rgba(255,255,255,.66);
  --r:18px;
  --dock-h:68px;
  --display:'Orbitron','Exo 2',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --sans:'Exo 2',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.75;font-weight:400;
  padding-bottom:calc(var(--dock-h) + 16px);
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:radial-gradient(rgba(0,0,0,.055) 1px,transparent 1px);
  background-size:4px 4px;opacity:.9;
}
main,footer,.dock{position:relative}
main{z-index:1}
footer{z-index:1}
img{max-width:100%}
a{color:var(--ink)}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}

/* 底部固定条 */
.dock{
  position:fixed;left:0;right:0;bottom:0;z-index:60;height:var(--dock-h);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 12px;background:rgba(0,0,0,.94);color:#fff;
  border-top:1px solid rgba(255,255,255,.22);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}
.menu{position:relative}
.menu summary{
  list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:9px;
  min-height:44px;padding:0 15px;border:1px solid rgba(255,255,255,.42);
  border-radius:999px;color:#fff;font-size:16px;line-height:1;
}
.menu summary::-webkit-details-marker{display:none}
.menu summary::marker{content:""}
.bars{display:block;width:16px;height:10px;border-top:2px solid currentColor;border-bottom:2px solid currentColor}
.menu[open] summary{background:#fff;color:#000}
.menu menu{
  position:absolute;left:0;bottom:calc(100% + 12px);width:min(82vw,330px);margin:0;padding:10px;
  list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:6px;
  background:rgba(0,0,0,.96);border:1px solid rgba(255,255,255,.24);border-radius:var(--r);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:0 18px 40px rgba(0,0,0,.28);
}
.menu menu a{
  display:flex;align-items:center;gap:9px;min-height:44px;padding:6px 10px;
  color:#fff;text-decoration:none;font-size:16px;line-height:1.3;border-radius:10px;
}
.menu menu a::before{content:"";width:6px;height:6px;background:#fff;transform:rotate(45deg);flex:0 0 auto}
.menu menu a:hover{background:rgba(255,255,255,.16)}
.dock-brand{
  position:absolute;left:50%;transform:translateX(-50%);
  color:#fff;text-decoration:none;font-family:var(--display);font-weight:600;
  font-size:15px;letter-spacing:.24em;padding:12px 4px;white-space:nowrap;
}
.dock-cta{
  display:inline-flex;align-items:center;min-height:44px;padding:0 17px;
  background:#fff;color:#000;border-radius:999px;text-decoration:none;
  font-size:16px;font-weight:600;line-height:1;
}
.dock-cta:hover{background:#d9d9d9}

/* 头图 */
.hero{
  position:relative;overflow:hidden;display:grid;align-items:center;
  grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);
  gap:clamp(16px,4vw,52px);min-height:45vh;max-width:1180px;margin:0 auto;
  padding:clamp(26px,5vw,56px) clamp(18px,5vw,56px) clamp(26px,5vw,52px);
  border-bottom:1px solid var(--line);
}
.hero-copy{position:relative;text-align:center;min-width:0}
.hero-ghost{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  font-family:var(--display);font-weight:700;line-height:.9;
  font-size:clamp(60px,14vw,150px);letter-spacing:.05em;color:var(--ghost);
  white-space:nowrap;pointer-events:none;
}
.hero h1{
  position:relative;margin:0;font-family:var(--display);font-weight:700;
  font-size:clamp(27px,5.6vw,56px);line-height:1.16;letter-spacing:.01em;
  word-break:break-word;
}
.hero-art{margin:0;min-width:0}
.hero-frame{
  position:relative;aspect-ratio:4/3;border-radius:var(--r);overflow:hidden;
  border:1px solid var(--line);background:var(--paper-2);
}
.hero-frame.is-empty{
  background-image:repeating-linear-gradient(45deg,#e9e8e3 0 9px,#f6f5f1 9px 18px);
}
.hero-frame img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .9s ease;
}
.hero-frame img:first-child,.hero-frame img.on{opacity:1}
.hero-art figcaption{
  margin-top:10px;font-family:var(--display);font-size:11px;letter-spacing:.3em;
  color:rgba(0,0,0,.5);
}

/* 正文 + 右侧栏 */
.body{
  display:grid;grid-template-columns:minmax(0,1fr) 252px;
  gap:clamp(22px,5vw,64px);max-width:1180px;margin:0 auto;
  padding:clamp(26px,5vw,54px) clamp(18px,5vw,56px) clamp(40px,7vw,84px);
}
.content{min-width:0;counter-reset:sec}
.content div{
  position:relative;counter-increment:sec;
  padding:clamp(20px,4vw,34px) 0;border-top:1px solid var(--line);
}
.content div:first-child{border-top:0;padding-top:0}
.content div[id]{scroll-margin-top:22px;scroll-margin-bottom:calc(var(--dock-h) + 22px)}
.content div::before{
  content:counter(sec,decimal-leading-zero);position:absolute;left:0;top:10px;
  font-family:var(--display);font-weight:700;line-height:1;
  font-size:clamp(34px,6vw,58px);color:var(--ghost);pointer-events:none;
}
.content h2{
  position:relative;margin:0 0 .55em;font-family:var(--display);font-weight:600;
  font-size:clamp(21px,3.1vw,30px);line-height:1.32;letter-spacing:.01em;
}
.content h3{
  position:relative;margin:1.2em 0 .5em;font-family:var(--display);font-weight:500;
  font-size:clamp(18px,2.3vw,21px);line-height:1.4;
}
.content h2 span,.content h3 span{display:inline}
.content p{margin:0 0 1.05em;max-width:64ch}
.content a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:2px}
.content a:hover{background:var(--ink);color:#fff;text-decoration:none}
.content ul,.content ol{margin:0 0 1.1em;padding-left:1.3em;max-width:62ch}
.content li{margin:.34em 0}
.content blockquote{
  margin:1.5em 0;padding:2px 0 2px 20px;border-left:4px solid var(--ink);
  font-family:var(--display);font-weight:500;font-size:clamp(17px,2.5vw,23px);line-height:1.5;
}
.content blockquote p:last-child{margin-bottom:0}
.content figure{margin:1.4em 0}
.content img{display:block;width:auto;border-radius:14px}
.content figcaption{
  margin-top:8px;font-size:14px;color:rgba(0,0,0,.55);letter-spacing:.04em;
}
.content div:first-child > p:first-of-type::first-letter{
  float:left;font-family:var(--display);font-weight:700;font-size:3.3em;
  line-height:.84;padding:8px 12px 0 0;
}

/* 右侧栏 */
.rail{position:sticky;top:24px;align-self:start;display:grid;gap:14px}
.rail-card{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r);
  padding:15px 15px 12px;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow:0 10px 26px rgba(0,0,0,.05);
}
.rail-card h2{
  margin:0 0 10px;font-family:var(--display);font-weight:600;
  font-size:12px;letter-spacing:.26em;text-transform:uppercase;
}
.rail-card h2 span{display:inline}
.rail-list{margin:0;padding:0;list-style:none}
.rail-list a{
  display:flex;align-items:center;gap:9px;min-height:40px;padding:4px 0;
  text-decoration:none;font-size:16px;line-height:1.35;
  border-bottom:1px solid var(--line-soft);
}
.rail-list li:last-child a{border-bottom:0}
.rail-list a:hover{text-decoration:underline;text-underline-offset:3px}
.rail-list .n{font-family:var(--display);font-size:11px;letter-spacing:.08em;color:rgba(0,0,0,.42)}
.rail-top{margin:0}
.rail-top a{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:999px;border:1px solid var(--ink);
  text-decoration:none;font-size:20px;line-height:1;
}
.rail-top a:hover{background:var(--ink);color:#fff}

/* 页脚 */
footer{
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:start;
  gap:16px 34px;background:var(--ink);color:#fff;
  border-top:1px solid var(--line);
  padding:clamp(30px,5vw,56px) clamp(18px,5vw,56px) clamp(24px,4vw,36px);
  margin-bottom:calc(var(--dock-h) + 0px);
}
.foot-brand{
  margin:0;font-family:var(--display);font-weight:700;line-height:.92;
  font-size:clamp(34px,9vw,74px);letter-spacing:.05em;
}
.foot-nav{
  margin:0;display:flex;flex-wrap:wrap;gap:0 16px;justify-content:flex-end;
  justify-self:end;max-width:360px;
}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:44px;
  color:#fff;text-decoration:none;font-size:16px;opacity:.78;
}
.foot-nav a:hover{opacity:1;text-decoration:underline;text-underline-offset:4px}
footer small{
  grid-column:1/-1;display:block;font-size:16px;line-height:1.6;
  color:rgba(255,255,255,.6);
  border-top:1px solid rgba(255,255,255,.24);padding-top:12px;margin-top:6px;
}

/* 滚动显现 */
.js .content div,.js .rail-card{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
.js .content div.is-in,.js .rail-card.is-in{opacity:1;transform:none}

@media (min-width:900px){
  .content div{padding-left:96px}
  .content div::before{left:0;top:16px;font-size:76px}
  .content div:nth-child(even){padding-left:132px}
  .content div:nth-child(even)::before{left:34px}
}
@media (max-width:860px){
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-frame{aspect-ratio:16/10}
  .body{grid-template-columns:1fr}
  .rail{position:static;grid-template-columns:1fr 1fr;display:grid}
  footer{grid-template-columns:1fr;gap:12px}
  .foot-nav{justify-self:start;justify-content:flex-start;max-width:none}
  .content div::before{opacity:.85}
  .content div{padding-left:54px}
}
@media (max-width:420px){
  .rail{grid-template-columns:1fr}
  .dock-brand{letter-spacing:.16em;font-size:14px}
  .menu summary,.dock-cta{padding:0 12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .content div,.js .rail-card{opacity:1;transform:none;transition:none}
  .hero-frame img{transition:none}
}

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