:root{
  --red:#ff0000;
  --vio:#8b00ff;
  --ink:#261717;
  --paper:#f8eff2;
  --muted:rgba(248,239,242,.66);
  --line:rgba(255,255,255,.2);
  --r:28px;
  --rail:92px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--ink);-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  padding-left:var(--rail);
  font-family:'Source Sans 3',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.78;
  color:var(--paper);
  overflow-x:hidden;
  background:
    linear-gradient(118deg,transparent 40%,rgba(255,255,255,.07) 47%,transparent 55%),
    radial-gradient(58rem 42rem at 8% -8%,rgba(255,0,0,.46),transparent 62%),
    radial-gradient(52rem 40rem at 96% 4%,rgba(139,0,255,.44),transparent 60%),
    radial-gradient(42rem 42rem at 58% 118%,rgba(255,0,0,.22),transparent 68%),
    var(--ink);
  background-attachment:fixed;
}
img{max-width:100%}

/* 左侧固定栏 */
.rail{
  position:fixed;
  left:0;top:0;bottom:0;
  width:var(--rail);
  z-index:50;
  display:flex;
  flex-direction:column;
  align-items:center;
  padding:58px 8px 18px;
  background:rgba(38,23,23,.52);
  -webkit-backdrop-filter:blur(15px);
  backdrop-filter:blur(15px);
  border-right:1px solid var(--line);
  overflow-y:auto;
  scrollbar-width:none;
}
.rail::-webkit-scrollbar{display:none}
.rail-nav{flex:1 1 auto;display:flex;align-items:center;justify-content:center;width:100%}
.rail-nav--top{order:1}
.rail-nav--bottom{order:3}
.rail-nav p{margin:0;display:flex;flex-direction:column;align-items:center;width:100%}
.rail-nav a{
  display:flex;align-items:center;justify-content:center;
  width:100%;min-height:44px;padding:6px 2px;
  font-size:16px;letter-spacing:.02em;line-height:1.3;
  color:rgba(248,239,242,.82);text-decoration:none;border-radius:12px;
  transition:background .25s ease,color .25s ease;
}
.rail-nav a:hover{color:#fff;background:rgba(255,0,0,.36)}
.brand{
  order:2;flex:0 0 auto;max-width:100%;
  padding:12px 4px;min-height:44px;
  font-size:16px;font-weight:700;line-height:1.3;letter-spacing:.04em;
  text-align:center;color:#fff;text-decoration:none;
  border-radius:20px;
  background:linear-gradient(180deg,rgba(255,0,0,.6),rgba(139,0,255,.6));
  box-shadow:0 12px 30px -14px rgba(255,0,0,.8);
}
.burger{
  position:absolute;top:10px;left:50%;transform:translateX(-50%);
  min-height:44px;min-width:44px;padding:0 10px;
  font:inherit;font-size:16px;color:#fff;cursor:pointer;
  border:1px solid var(--line);border-radius:14px;
  background:rgba(255,255,255,.12);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.burger:hover{background:rgba(255,0,0,.5)}

/* 全屏菜单 */
body.menu-open{overflow:hidden}
body.menu-open .rail{
  right:0;bottom:0;left:0;top:0;width:auto;
  flex-direction:column;justify-content:center;
  padding:70px 24px;
  border-right:0;
  background:rgba(38,23,23,.9);
  -webkit-backdrop-filter:blur(22px);
  backdrop-filter:blur(22px);
}
body.menu-open .rail-nav{flex:0 0 auto;width:100%;max-width:520px}
body.menu-open .rail-nav p{flex-direction:column;align-items:stretch;gap:8px}
body.menu-open .rail-nav a{min-height:52px;font-size:20px;background:rgba(255,255,255,.07)}
body.menu-open .brand{order:0;margin-bottom:18px;max-width:280px}
body.menu-open .burger{position:absolute;top:16px;right:16px;left:auto;transform:none}

main{position:relative;z-index:1}
.wrap{
  max-width:1180px;margin:0 auto;
  padding:26px 22px 0;
  display:grid;
  grid-template-columns:minmax(0,1fr) 264px;
  gap:24px;
  align-items:start;
}
.sheet{
  padding:16px;
  border-radius:34px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.08);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  box-shadow:0 44px 90px -46px rgba(0,0,0,.85);
}
.doc{display:block}

/* 首屏 */
.hero{
  position:relative;
  min-height:45vh;
  display:grid;place-items:center;
  padding:34px 18px;
  border-radius:30px;
  overflow:hidden;
  isolation:isolate;
  background:
    radial-gradient(70% 100% at 50% 0%,rgba(255,0,0,.32),transparent 72%),
    rgba(38,23,23,.36);
}
.ghost{
  position:absolute;left:0;right:0;bottom:50%;
  transform:translateY(50%);
  z-index:0;
  text-align:center;
  font-family:'Bebas Neue','Source Sans 3',sans-serif;
  font-size:clamp(76px,17vw,190px);
  line-height:1;letter-spacing:.08em;
  color:rgba(255,255,255,.1);
  pointer-events:none;user-select:none;
  will-change:transform;
}
.hero-art{position:absolute;inset:0;z-index:1;pointer-events:none}
.hero-art img{
  position:absolute;
  object-fit:cover;
  border-radius:22px;
  border:1px solid var(--line);
  box-shadow:0 30px 60px -22px rgba(0,0,0,.8);
}
.hero-art img:nth-child(1){width:40%;height:60%;left:-3%;top:6%;transform:rotate(-5deg)}
.hero-art img:nth-child(2){width:36%;height:54%;right:-2%;bottom:4%;transform:rotate(6deg)}
.hero-copy{position:relative;z-index:2;max-width:22ch;text-align:center}
.hero-copy h1{
  margin:0;
  font-size:clamp(30px,5.2vw,58px);
  font-weight:800;line-height:1.16;letter-spacing:.01em;
  text-shadow:0 8px 34px rgba(0,0,0,.8);
}

/* 正文区 */
.doc > div{
  position:relative;
  margin-top:18px;
  padding:26px 22px 30px;
  border-radius:var(--r);
  background:rgba(255,255,255,.055);
  scroll-margin-top:26px;
}
.doc > div > :first-child{margin-top:0}
.doc h2{margin:0 0 10px;font-size:clamp(21px,3.2vw,29px);line-height:1.32;font-weight:800;color:#fff}
.doc h3{margin:22px 0 8px;font-size:19px;font-weight:700;color:#fff}
.doc p{margin:0 0 14px;color:rgba(248,239,242,.88)}
.doc a{color:#ffb8c4;text-decoration:underline;text-underline-offset:3px}
.doc a:hover{color:#fff}
.doc ul,.doc ol{margin:0 0 16px;padding-left:1.25em;color:rgba(248,239,242,.88)}
.doc li{margin:0 0 6px}
.doc strong{color:#fff}
.doc blockquote{
  margin:0 0 16px;padding:12px 16px;
  border-left:3px solid var(--red);
  border-radius:0 16px 16px 0;
  background:rgba(255,0,0,.15);
}
.doc div img{max-width:100%;height:auto;margin:6px 0 14px;border-radius:20px}
.doc p:last-child,.doc ul:last-child,.doc ol:last-child{margin-bottom:0}

/* 右栏 */
.side{
  position:sticky;top:24px;
  padding:22px 18px;
  border-radius:var(--r);
  border:1px solid var(--line);
  background:rgba(255,255,255,.1);
  -webkit-backdrop-filter:blur(15px);
  backdrop-filter:blur(15px);
}
.side h2{margin:0 0 6px;font-size:20px;font-weight:800;letter-spacing:.05em;color:#fff}
.side .subtitle{margin:0 0 16px;font-size:16px;line-height:1.65;color:var(--muted)}
.side-list{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.side-list a{
  display:flex;align-items:center;min-height:40px;padding:4px 10px;
  font-size:16px;color:var(--paper);text-decoration:none;border-radius:14px;
  background:rgba(255,255,255,.06);
  transition:background .25s ease,color .25s ease;
}
.side-list a:hover{background:rgba(255,0,0,.42);color:#fff}

/* 页脚 */
.foot{
  position:relative;z-index:1;
  max-width:1180px;margin:32px auto 0;
  padding:0 22px 40px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px 24px;
  align-items:start;
}
.foot p{margin:0}
.foot-cta{
  grid-column:1/-1;
  padding:22px;
  border-radius:32px;
  border:1px solid var(--line);
  background:linear-gradient(118deg,rgba(255,0,0,.6),rgba(139,0,255,.6));
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  text-align:center;
}
.foot-cta a{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:6px 22px;
  font-size:20px;font-weight:700;letter-spacing:.14em;
  color:#fff;text-decoration:none;border-radius:20px;
}
.foot-cta a:hover{background:rgba(0,0,0,.25)}
.foot-brand{font-size:16px;line-height:1.7;color:var(--muted)}
.foot-brand strong{display:block;margin-bottom:6px;font-size:18px;color:var(--paper)}
.foot-links{display:flex;flex-wrap:wrap;gap:2px 14px}
.foot-links a{
  display:inline-flex;align-items:center;min-height:40px;
  font-size:16px;color:var(--muted);text-decoration:none;
}
.foot-links a:hover{color:#fff}
.foot small{
  grid-column:1/-1;
  padding-top:10px;
  font-size:16px;color:rgba(248,239,242,.5);
  border-top:1px solid rgba(255,255,255,.13);
}

/* 入场 */
.js .doc > div{opacity:0;transform:translateY(18px);transition:opacity .55s ease,transform .55s ease}
.js .doc > div.in{opacity:1;transform:none}

@media (max-width:860px){
  body{padding-left:0;padding-top:168px}
  .rail{
    right:0;bottom:auto;left:0;top:0;width:auto;height:auto;
    flex-direction:row;flex-wrap:wrap;align-items:center;
    padding:8px 10px 10px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .brand{order:1;margin:0 auto 0 0;padding:6px 8px;text-align:left;box-shadow:none}
  .burger{order:2;position:static;transform:none}
  .rail-nav{order:3;flex:1 1 100%;width:100%;display:block}
  .rail-nav p{flex-direction:row;flex-wrap:wrap;justify-content:center;gap:6px}
  .rail-nav a{padding:6px 10px;background:rgba(255,255,255,.07)}
  .wrap{grid-template-columns:1fr;gap:18px;padding:14px 14px 0}
  .sheet{padding:11px;border-radius:26px}
  .hero{min-height:44vh;border-radius:24px}
  .doc > div{padding:22px 16px 26px;scroll-margin-top:172px}
  .side{position:static;margin-top:0}
  .foot{grid-template-columns:1fr;padding:0 14px 34px;margin-top:22px}
}
@media (max-width:420px){
  body{padding-top:200px}
  .doc > div{scroll-margin-top:200px}
  .hero-art img:nth-child(1){width:46%;height:52%}
  .hero-art img:nth-child(2){width:42%;height:48%}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .js .doc > div{opacity:1;transform:none;transition:none}
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

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