@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap');

:root{
  --ink:#26171a;
  --pink:#eb879c;
  --blush:#ffb6c1;
  --pink-deep:#b8556c;
  --paper:#fdf6f5;
  --card:#ffffff;
  --line:rgba(38,23,26,.14);
  --mute:#6f565a;
  --shadow:0 1px 2px rgba(38,23,26,.06),0 8px 22px -12px rgba(38,23,26,.30);
  --shadow-lift:0 2px 4px rgba(38,23,26,.09),0 16px 34px -16px rgba(38,23,26,.36);
}

*,*::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:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
}
img{max-width:100%;height:auto}
a{color:var(--pink-deep)}
:focus-visible{outline:3px solid var(--pink);outline-offset:3px}

/* 顶部 */
.masthead{
  position:sticky;top:0;z-index:40;
  background:rgba(253,246,245,.95);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.strip{
  display:flex;align-items:center;gap:9px;
  margin:0;padding:5px 16px;
  background:var(--ink);color:#ffe9ee;
  font-size:16px;line-height:1.45;
}
.strip-dot{flex:0 0 auto;width:8px;height:8px;background:var(--pink);transform:skewX(-14deg)}
.strip-line{min-width:0;flex:1;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}

.brandbar{display:flex;align-items:center;padding:7px 16px}
.brand{
  display:inline-flex;align-items:center;gap:11px;
  min-height:44px;padding:4px 0;
  color:var(--ink);text-decoration:none;
  font-weight:800;font-size:1.06rem;letter-spacing:.01em;
  transition:transform .22s ease;
}
.brand:hover{transform:translateX(2px)}
.mark{
  display:block;width:26px;height:26px;flex:0 0 auto;border:0;
  background:linear-gradient(135deg,var(--pink),var(--blush) 58%,var(--pink-deep));
  box-shadow:var(--shadow);
  transform:skewX(-10deg);
  object-fit:cover;
}
.brand-name{transform:skewX(0)}

.menu{
  border-top:1px solid var(--line);
  overflow-x:auto;overflow-y:hidden;
  scrollbar-width:thin;
  -webkit-overflow-scrolling:touch;
}
.menu-list{
  display:flex;gap:4px;align-items:stretch;
  margin:0;padding:6px 12px;list-style:none;white-space:nowrap;
}
.menu-list a{
  display:flex;align-items:center;
  min-height:44px;padding:8px 12px;
  background:var(--card);
  border:1px solid var(--line);
  box-shadow:0 1px 2px rgba(38,23,26,.06);
  color:var(--ink);text-decoration:none;
  font-size:16px;font-weight:600;
  transition:background .22s ease,color .22s ease,box-shadow .22s ease;
}
.menu-list a:hover{background:var(--ink);color:#ffe9ee;box-shadow:var(--shadow-lift)}

/* 首屏 */
.hero{
  position:relative;isolation:isolate;overflow:hidden;
  display:flex;align-items:center;
  min-height:100vh;min-height:100svh;
  background:linear-gradient(150deg,#26171a 6%,#5b3038 58%,#8f4f5c 100%);
}
.hero-frame{position:absolute;inset:0;z-index:-2}
.hero-img{display:block;width:100%;height:100%;object-fit:cover;opacity:.52;filter:saturate(.92)}
.hero-veil{
  position:absolute;inset:0;z-index:-1;
  background:
    linear-gradient(100deg,rgba(38,23,26,.92) 6%,rgba(38,23,26,.58) 46%,rgba(38,23,26,.16) 82%),
    linear-gradient(to top,rgba(38,23,26,.78),rgba(38,23,26,0) 52%);
}
.hero-copy{
  position:relative;width:100%;max-width:1180px;margin:0 auto;
  padding:88px 20px 132px;text-align:left;
}
.hero-h1{
  margin:0;max-width:22ch;
  color:#fff;font-weight:800;
  font-size:clamp(2.1rem,5.6vw,4rem);
  line-height:1.14;letter-spacing:-.022em;
  text-shadow:0 10px 34px rgba(0,0,0,.38);
}
.hero-h1::before{
  content:"";display:block;width:74px;height:11px;margin-bottom:24px;
  background:var(--pink);
  clip-path:polygon(0 0,100% 0,86% 100%,0 100%);
}
.hero-belt{
  position:absolute;left:0;right:0;bottom:-1px;height:96px;
  background:var(--pink);
  clip-path:polygon(0 62%,100% 0,100% 100%,0 100%);
}
.hero-belt::after{content:"";position:absolute;inset:15px 0 0 0;background:var(--paper)}

/* 主体 */
.wrap{
  max-width:1180px;margin:0 auto;padding:56px 20px 76px;
  display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:44px;
  align-items:start;
}
.body{min-width:0}
article div{scroll-margin-top:142px}
article [id]{scroll-margin-top:142px}

.prose{
  background:var(--card);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  padding:clamp(22px,3.4vw,46px);
}
.prose > :first-child{margin-top:0}
.prose > div{padding:34px 0;border-top:1px solid var(--line)}
.prose > div:first-child{border-top:0;padding-top:0}
.prose > div:last-child{padding-bottom:0}
.prose h2{
  margin:0 0 14px;
  font-size:clamp(1.35rem,2.6vw,1.7rem);
  line-height:1.3;letter-spacing:-.01em;font-weight:800;
}
.prose h2::after{
  content:"";display:block;width:44px;height:4px;margin-top:12px;
  background:var(--blush);
  transform:skewX(-16deg);
}
.prose h3{margin:26px 0 10px;font-size:1.14rem;line-height:1.4;font-weight:700}
.prose p{margin:0 0 1.05em}
.prose ul,.prose ol{margin:0 0 1.05em;padding-left:1.35em}
.prose li{margin:0 0 .4em}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--ink);background:var(--blush)}
.prose blockquote{
  margin:0 0 1.1em;padding:14px 18px;
  background:#fdf0f2;border-left:4px solid var(--pink);
  box-shadow:0 1px 2px rgba(38,23,26,.05);
}
.prose blockquote p:last-child{margin:0}
.prose table{display:block;width:100%;overflow-x:auto;border-collapse:collapse;font-size:1rem}
.prose th,.prose td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.prose th{background:#fdf0f2;font-weight:700}
.prose code,.prose pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.prose pre{overflow-x:auto;padding:14px;background:#241417;color:#f7e6ea;font-size:16px}
.prose img{box-shadow:var(--shadow)}

/* 侧栏 */
.rail{
  position:sticky;top:132px;
  background:var(--card);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  padding:22px 20px 18px;
}
.eyebrow{
  display:inline-block;
  font-size:16px;font-weight:700;letter-spacing:.16em;
  color:var(--pink-deep);
}
.rail-title{margin:4px 0 14px;font-size:1.06rem;line-height:1.4;font-weight:800}
.rail-list{list-style:none;margin:0;padding:0;counter-reset:rail}
.rail-list li{counter-increment:rail;border-top:1px solid var(--line)}
.rail-list li:first-child{border-top:0}
.rail-list a{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:10px 2px;
  color:var(--ink);text-decoration:none;
  font-size:16px;font-weight:600;line-height:1.4;
  transition:color .2s ease,transform .2s ease;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-weight:700;color:var(--pink);
  font-variant-numeric:tabular-nums;letter-spacing:0;
}
.rail-list a:hover{color:var(--pink-deep);transform:translateX(3px)}

/* 页脚 */
.foot{
  display:grid;grid-template-columns:1.5fr 1fr 1.2fr;gap:30px 44px;
  padding:54px max(20px,calc((100% - 1180px) / 2)) 18px;
  background:var(--ink);color:#f3dfe4;
}
.foot-sec{min-width:0}
.foot-logo{
  display:inline-block;padding:6px 0;min-height:44px;
  color:#fff;text-decoration:none;font-weight:800;font-size:1.14rem;
  letter-spacing:.01em;
}
.foot-logo:hover{color:var(--blush)}
.foot-desc{margin:10px 0 0;max-width:40ch;font-size:16px;line-height:1.7;color:rgba(243,223,228,.82)}
.foot-h{
  margin:0 0 12px;font-size:16px;font-weight:700;
  letter-spacing:.16em;color:var(--blush);
}
.foot-list{list-style:none;margin:0;padding:0}
.foot-list a{
  display:block;min-height:40px;padding:8px 0;
  color:#f3dfe4;text-decoration:none;font-size:16px;
  border-bottom:1px dotted rgba(243,223,228,.18);
  transition:color .2s ease,padding-left .2s ease;
}
.foot-list li:last-child a{border-bottom:0}
.foot-list a:hover{color:var(--blush);padding-left:4px}

.sub-label{display:block;margin-bottom:8px;font-size:16px;color:var(--blush)}
.sub-row{display:flex;gap:8px}
.sub-row input{
  flex:1 1 auto;min-width:0;height:48px;
  border:1px solid transparent;background:#fff;color:var(--ink);
  padding:0 12px;font:inherit;font-size:16px;
}
.sub-row input::placeholder{color:#a08a8e}
.sub-row button{
  flex:0 0 auto;height:48px;padding:0 20px;
  border:0;background:var(--pink);color:var(--ink);
  font:inherit;font-size:16px;font-weight:700;cursor:pointer;
  transition:background .22s ease,transform .22s ease;
}
.sub-row button:hover{background:var(--blush);transform:translateY(-1px)}

.foot-base{
  grid-column:1 / -1;margin-top:14px;padding-top:16px;
  border-top:1px solid rgba(243,223,228,.2);text-align:center;
}
.copy{margin:0;font-size:16px;color:rgba(243,223,228,.78)}

/* 回到顶部 */
.to-top{
  position:fixed;right:16px;bottom:16px;z-index:50;
  min-height:44px;padding:11px 15px;
  border:0;background:var(--ink);color:#fff;
  font:inherit;font-size:16px;font-weight:600;cursor:pointer;
  box-shadow:var(--shadow-lift);
  transition:background .22s ease,transform .22s ease;
}
.to-top:hover{background:var(--pink-deep);transform:translateY(-2px)}

/* 滚动显现 */
.reveal{transition:opacity .28s ease,transform .28s ease}
.js .reveal{opacity:0;transform:translateY(16px)}
.js .reveal.in{opacity:1;transform:none}

@media (max-width:960px){
  .wrap{grid-template-columns:minmax(0,1fr);gap:30px;padding-top:40px;padding-bottom:56px}
  .rail{position:static;order:2}
  .foot{grid-template-columns:1fr 1fr;gap:26px 28px;padding-top:44px}
  .foot-brand{grid-column:1 / -1}
  .foot-sub{grid-column:1 / -1}
}

@media (max-width:640px){
  body{font-size:17px}
  .strip{padding:5px 14px}
  .brandbar{padding:6px 14px}
  .menu-list{padding:6px 10px}
  .hero-copy{padding:64px 16px 112px}
  .hero-belt{height:72px}
  .wrap{padding:32px 14px 48px}
  .prose{padding:22px 16px}
  .foot{padding:40px 16px 16px;gap:24px}
  .foot-list a{min-height:44px;padding:10px 0}
  .sub-row{flex-wrap:wrap}
  .sub-row input{flex:1 1 100%}
  .sub-row button{flex:1 1 100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none}
  *,*::before,*::after{transition:none!important;animation:none!important}
}

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