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

:root{
  --paper:#f5e6c8;
  --paper-lt:#fbf3e0;
  --amber:#d4a574;
  --amber-dp:#8a6134;
  --ink:#262117;
  --ink-2:rgba(38,33,23,.72);
  --ink-3:rgba(38,33,23,.48);
  --line:rgba(38,33,23,.16);
  --line-2:rgba(255,250,238,.55);
  --glass:rgba(255,250,238,.56);
  --r:28px;
  --bar:3.55rem;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:7.6rem}
body{
  margin:0;
  font-size:17px;
  line-height:1.72;
  color:var(--ink);
  font-family:"IBM Plex Sans",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background-color:var(--paper);
  background-image:
    radial-gradient(48rem 34rem at 106% -8%,rgba(212,165,116,.55),transparent 62%),
    radial-gradient(32rem 26rem at -12% 32%,rgba(212,165,116,.32),transparent 66%),
    linear-gradient(180deg,#f9eed6 0%,#f2e2c1 55%,#e8d5ae 100%);
  background-attachment:fixed;
  overflow-x:hidden;
}
body.locked{overflow:hidden}
img{max-width:100%}
p{margin:0 0 .9rem}
p:last-child{margin-bottom:0}
h1,h2,h3{font-weight:600;line-height:1.3;margin:0}
a{color:var(--amber-dp)}
a:focus-visible,button:focus-visible{outline:2px dashed var(--amber-dp);outline-offset:3px}

body::after{
  content:"";position:fixed;inset:0;z-index:60;pointer-events:none;opacity:.32;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23g)' opacity='0.5'/%3E%3C/svg%3E");
}

/* 顶栏 */
.topbar{
  position:sticky;top:0;z-index:30;border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(247,235,212,.97),rgba(247,235,212,.84));
  backdrop-filter:blur(10px);
}
.topbar-inner{
  max-width:1120px;margin:0 auto;min-height:var(--bar);padding:0 .9rem;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:.4rem;
}
.split{display:flex;align-items:center;gap:.1rem;min-width:0}
.split-l{justify-self:start}
.topbar-end{justify-self:end;display:flex;align-items:center;gap:.15rem}
.split a,.call{
  display:inline-flex;align-items:center;min-height:40px;padding:0 .5rem;border-radius:999px;
  font-size:.84rem;letter-spacing:.04em;color:var(--ink-2);text-decoration:none;white-space:nowrap;
}
.split a:hover,.call:hover{color:var(--ink);background:rgba(212,165,116,.3)}
.brand{
  justify-self:center;font-size:1.02rem;font-weight:600;letter-spacing:.3em;
  color:var(--ink);text-decoration:none;padding:.5rem .3rem;
}
.burger{
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:52px;
  margin-left:.2rem;padding:0 .7rem;border:1px solid var(--line);border-radius:999px;
  background:rgba(255,250,238,.6);color:var(--ink);font:inherit;font-size:.84rem;letter-spacing:.1em;cursor:pointer;
}
.burger:hover{background:var(--amber);border-color:var(--amber)}

/* 锚点条 */
.strip{
  position:sticky;top:var(--bar);z-index:29;display:flex;gap:.35rem;overflow-x:auto;
  padding:.42rem .9rem;border-bottom:1px solid var(--line);
  background:rgba(38,33,23,.055);backdrop-filter:blur(8px);scrollbar-width:none;
}
.strip::-webkit-scrollbar{display:none}
.strip a{
  flex:0 0 auto;display:inline-flex;align-items:center;min-height:40px;padding:0 .8rem;
  font-size:.8rem;letter-spacing:.1em;text-decoration:none;color:var(--ink);
  border:1px solid var(--line);border-radius:999px;background:rgba(255,250,238,.55);white-space:nowrap;
}
.strip a:hover{background:var(--amber);border-color:var(--amber)}

/* 遮罩菜单 */
.drawer{
  position:fixed;inset:0;z-index:45;display:grid;grid-template-rows:auto 1fr auto;gap:1rem;padding:1rem;
  background:linear-gradient(160deg,#2c2418,#1b1710 70%);color:var(--paper);
  opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .3s ease,transform .3s ease,visibility .3s;
}
.drawer.open{opacity:1;visibility:visible;transform:none}
.drawer-top{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.drawer-mark{letter-spacing:.32em;font-weight:600}
.drawer-close{
  min-height:44px;padding:0 1rem;border-radius:999px;border:1px solid rgba(245,230,200,.4);
  background:transparent;color:var(--paper);font:inherit;font-size:.85rem;letter-spacing:.14em;cursor:pointer;
}
.drawer-nav{display:flex;flex-direction:column;justify-content:center;counter-reset:dr;overflow:auto}
.drawer-nav a{
  display:flex;align-items:center;min-height:52px;padding:0 .2rem;
  color:var(--paper);text-decoration:none;font-size:1.12rem;letter-spacing:.12em;
  border-bottom:1px solid rgba(245,230,200,.16);
}
.drawer-nav a::before{
  counter-increment:dr;content:counter(dr,decimal-leading-zero);
  width:2.2rem;font-size:.72rem;letter-spacing:.1em;color:var(--amber);
}
.drawer-nav a:hover{color:var(--amber)}
.drawer-foot{border-top:1px solid rgba(245,230,200,.16);padding-top:.6rem}
.drawer-call{display:inline-flex;align-items:center;min-height:44px;color:var(--amber);text-decoration:none;letter-spacing:.16em}

/* 主区 */
.sheet{display:block}
.hero{
  position:relative;display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);
  gap:2rem;align-items:center;min-height:70vh;max-width:1120px;margin:0 auto;
  padding:2.4rem 1rem 3rem;overflow:clip;
}
.hero::before{
  content:"";position:absolute;right:-18%;top:-14%;width:72%;height:126%;z-index:0;pointer-events:none;
  background:radial-gradient(closest-side,rgba(212,165,116,.62),rgba(212,165,116,0) 72%);
  animation:leak 15s ease-in-out infinite alternate;
}
@keyframes leak{
  from{opacity:.45;transform:translate3d(0,0,0) scale(1)}
  to{opacity:.9;transform:translate3d(-5%,4%,0) scale(1.1)}
}
.hero-frame{
  position:relative;z-index:1;margin:0;padding:.7rem .7rem 2.3rem;transform:rotate(-1.7deg);
  background:#fffaf0;border:1px solid rgba(38,33,23,.12);border-radius:10px;
  box-shadow:0 22px 44px -26px rgba(38,33,23,.6);transition:transform .5s ease;
}
.hero-frame:hover{transform:rotate(-.4deg) scale(1.012)}
.hero-img,.hero-plate{display:block;width:100%;height:min(46vh,420px);border-radius:4px;object-fit:cover}
.hero-img{filter:sepia(.26) saturate(.85) contrast(1.05)}
.hero-plate{background:linear-gradient(155deg,#dcae7c,#b98d5c 42%,#7c5b35);position:relative;overflow:hidden}
.hero-plate::after{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(180deg,rgba(255,250,238,.14) 0 2px,transparent 2px 7px);
}
.hero-copy{position:relative;z-index:1;text-align:right}
.hero-copy::before{
  content:"";display:block;height:7px;width:58%;margin:0 0 1.1rem auto;
  background:linear-gradient(270deg,var(--amber),rgba(212,165,116,0));transform:skewX(-26deg);
}
.kicker{margin:0 0 .5rem;font-size:.76rem;letter-spacing:.42em;color:var(--amber-dp)}
.hero h1{font-size:clamp(1.85rem,4.6vw,3rem);line-height:1.2;letter-spacing:.01em}
.hero-sub{margin:.9rem 0 1.5rem;max-width:36ch;margin-left:auto;color:var(--ink-2);font-size:1rem}
.hero-go{
  display:inline-flex;align-items:center;min-height:46px;padding:0 1.7rem;border-radius:999px;
  background:var(--ink);color:var(--paper);text-decoration:none;font-size:.9rem;letter-spacing:.22em;
}
.hero-go:hover{background:var(--amber-dp)}

.stage{
  display:flex;flex-wrap:wrap;align-items:flex-start;gap:1.6rem 2rem;
  max-width:1120px;margin:0 auto;padding:.6rem 1rem 3.4rem;
}
.still{
  position:relative;flex:1 1 100%;height:5.4rem;margin:0;border-radius:var(--r);overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(104deg,rgba(212,165,116,.6),rgba(245,230,200,.22) 46%,rgba(38,33,23,.14));
}
.still::after{
  content:"";position:absolute;inset:0;pointer-events:none;mix-blend-mode:multiply;
  background:repeating-linear-gradient(180deg,rgba(38,33,23,.09) 0 1px,transparent 1px 4px);
}
.still::before{
  content:"";position:absolute;left:0;right:0;top:-45%;height:45%;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(255,250,238,.6),transparent);
  animation:vhs 7.5s linear infinite;
}
@keyframes vhs{from{transform:translateY(0)}to{transform:translateY(330%)}}
.still-img{width:100%;height:100%;object-fit:cover;display:block;filter:sepia(.32) saturate(.78) contrast(1.05)}

.stream{flex:1 1 62%;min-width:0}
.stream section{
  margin:0 0 1.15rem;padding:1.5rem 1.35rem;border-radius:var(--r);
  background:var(--glass);border:1px solid var(--line-2);
  box-shadow:0 22px 46px -38px rgba(38,33,23,.9);
  backdrop-filter:blur(7px);
}
.stream section[id]{scroll-margin-top:7.8rem}
.stream section>:first-child{margin-top:0}
.stream h2{font-size:1.26rem;margin:0 0 .55rem}
.stream h2::before{
  content:"";display:inline-block;width:1.4rem;height:2px;margin-right:.55rem;
  background:var(--amber);vertical-align:.3em;
}
.stream h3{font-size:1.05rem;margin:1.2rem 0 .4rem}
.stream p{color:var(--ink-2);max-width:64ch}
.stream a{text-underline-offset:3px}
.stream ul,.stream ol{padding-left:1.3rem;color:var(--ink-2)}
.stream li{margin:.25rem 0}
.stream blockquote{
  margin:1rem 0;padding:.7rem 1rem;border-left:3px solid var(--amber);
  background:rgba(255,250,238,.55);color:var(--ink-2);
}
.stream figure{margin:1rem 0}
.stream figcaption{font-size:.8rem;color:var(--ink-3);margin-top:.35rem}

.rail{
  flex:0 0 15.5rem;position:sticky;top:8.2rem;
  padding:1.05rem .9rem;border-radius:var(--r);
  background:rgba(255,250,238,.62);border:1px solid var(--line);
  backdrop-filter:blur(8px);box-shadow:0 20px 40px -32px rgba(38,33,23,.9);
}
.rail h2{font-size:.92rem;letter-spacing:.24em;margin:0}
.rail .subtitle{margin:.15rem 0 .7rem;font-size:.74rem;letter-spacing:.2em;color:var(--ink-3)}
.rail-nav{display:flex;flex-direction:column;counter-reset:rl}
.rail-nav a{
  display:flex;align-items:center;min-height:40px;padding:0 .2rem;
  font-size:.84rem;color:var(--ink);text-decoration:none;border-bottom:1px dashed var(--line);
}
.rail-nav a::before{
  counter-increment:rl;content:counter(rl,decimal-leading-zero);
  margin-right:.6rem;font-size:.68rem;letter-spacing:.08em;color:var(--amber);
}
.rail-nav a:hover{color:var(--amber-dp)}

/* 页脚 */
.colophon{
  margin-top:1rem;border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(38,33,23,.04),rgba(38,33,23,.11));
}
.cta{max-width:1120px;margin:0 auto;padding:3rem 1rem 1.9rem;text-align:center}
.cta h2{font-size:clamp(1.45rem,4vw,2.1rem);letter-spacing:.04em}
.cta .subtitle{margin:.35rem 0 1.35rem;font-size:.76rem;letter-spacing:.36em;color:var(--ink-3)}
.cta-go{
  display:inline-flex;align-items:center;min-height:46px;padding:0 1.7rem;border-radius:999px;
  background:var(--ink);color:var(--paper);text-decoration:none;font-size:.88rem;letter-spacing:.24em;
}
.cta-go:hover{background:var(--amber-dp)}
.bar{
  max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:1rem;flex-wrap:wrap;
  padding:.7rem 1rem 1.5rem;border-top:1px solid var(--line);
}
.mark{font-size:.9rem;font-weight:600;letter-spacing:.3em;color:var(--ink);text-decoration:none}
.foot-nav{flex:1 1 auto;min-width:0}
.foot-nav dl{display:flex;flex-wrap:wrap;align-items:center;gap:.05rem .8rem;margin:0}
.foot-nav dt,.foot-nav dd{margin:0}
.foot-nav dt a{display:inline-flex;align-items:center;min-height:40px;font-size:.8rem;color:var(--ink-2);text-decoration:none}
.foot-nav dt a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:4px}
.foot-nav dd{font-size:.68rem;letter-spacing:.08em;color:var(--amber);margin-right:.3rem}
.copy{margin:0;font-size:.78rem;letter-spacing:.1em;color:var(--ink-3)}

/* 动效 */
.reveal{opacity:0;transform:translateY(15px)}
.reveal.in{opacity:1;transform:none;transition:opacity .65s ease,transform .65s ease}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;min-height:auto;gap:1.3rem;padding:1.3rem 1rem 2rem}
  .hero-copy{text-align:left}
  .hero-copy::before{margin-left:0;width:44%}
  .hero-sub{margin-left:0}
  .hero-frame{transform:rotate(-1deg)}
  .hero-img,.hero-plate{height:min(28vh,200px)}
  .stage{flex-direction:column;gap:1.3rem;padding-bottom:2.4rem}
  .still{width:100%;height:3.6rem}
  .stream,.rail{flex:1 1 auto;width:100%}
  .rail{position:static}
  .rail-nav{flex-direction:row;flex-wrap:wrap;gap:.35rem}
  .rail-nav a{border:1px solid var(--line);border-radius:999px;padding:0 .7rem;background:rgba(255,250,238,.6)}
  .bar{flex-direction:column;align-items:flex-start}
}
@media (max-width:820px){
  .split,.call{display:none}
  .topbar-inner{grid-template-columns:auto 1fr auto;gap:.3rem}
  .brand{justify-self:center}
  .sheet .hero{padding-top:1.1rem}
}
@media (max-width:420px){
  body{font-size:16px}
  .stream div{padding:1.15rem 1rem;border-radius:22px}
  .cta{padding-top:2.3rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .reveal{opacity:1;transform:none}
}

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