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

:root{
  --pink:#eb879c;
  --pink-soft:#ffb6c1;
  --pink-deep:#b8566f;
  --ink:#26171a;
  --ink-2:#4d3439;
  --plum:#3a1f27;
  --paper:#fff8f9;
  --card:#ffffff;
  --line:rgba(38,23,26,.13);
  --line-2:rgba(235,135,156,.55);
  --r:28px;
  --sh:0 2px 4px rgba(38,23,26,.06), 0 14px 30px -20px rgba(38,23,26,.4);
  --sh-lift:0 4px 8px rgba(38,23,26,.08), 0 20px 40px -22px rgba(38,23,26,.5);
  --ease:200ms cubic-bezier(.4,0,.2,1);
}

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

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:'Nunito Sans','Rubik',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.72;
  color:var(--ink);
  background:
    radial-gradient(1100px 460px at 84% -12%, #ffe1e8 0%, rgba(255,225,232,0) 62%),
    radial-gradient(900px 420px at -10% 8%, #fff0f4 0%, rgba(255,240,244,0) 60%),
    linear-gradient(180deg,#fff8f9 0%,#fdf0f3 55%,#fff8f9 100%);
  background-attachment:fixed;
}

img{max-width:100%;display:block;border:0}
a{color:inherit}
p{margin:0 0 1em}
h1,h2,h3{font-family:'Rubik','Nunito Sans',system-ui,sans-serif;letter-spacing:.005em}

:focus-visible{outline:3px solid var(--pink-deep);outline-offset:2px;border-radius:10px}

[data-rv]{will-change:opacity,transform}
[data-rv].rv-init{opacity:0;transform:translateY(18px)}
[data-rv].in{opacity:1;transform:none;transition:opacity var(--ease),transform var(--ease)}
@media (prefers-reduced-motion:reduce){
  [data-rv].rv-init{opacity:1;transform:none}
  [data-rv].in{transition:none}
}

/* 顶栏 */
.deck{
  position:sticky;top:0;z-index:50;
  background:rgba(255,248,249,.88);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid var(--line);
  box-shadow:0 2px 4px rgba(38,23,26,.05);
}
.deck-in{
  max-width:1180px;margin:0 auto;
  display:flex;align-items:center;gap:12px;
  padding:10px clamp(12px,3vw,26px);
}
.pills{
  flex:1 1 auto;min-width:0;margin:0;
  display:flex;align-items:center;gap:8px;justify-content:center;
}
.pill-set{
  list-style:none;margin:0;padding:0;
  display:flex;gap:8px;flex:1 1 0;min-width:0;
}
.pill-set.set-a{justify-content:flex-end}
.pill-set.set-b{justify-content:flex-start}
.pill{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:42px;padding:0 16px;
  border:1px solid var(--line-2);border-radius:999px;
  background:#fff;color:var(--ink);
  font-size:16px;font-weight:600;text-decoration:none;white-space:nowrap;
  transition:background var(--ease),color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.pill:hover{background:var(--pink);color:#fff;border-color:var(--pink);box-shadow:var(--sh)}
.pill:active{transform:translateY(1px)}
.pill-set li.off{display:none}
.pill.hit{background:#fff3f6;border-color:var(--pink);color:var(--pink-deep)}

.mark{
  flex:0 0 auto;
  font-family:'Rubik',system-ui,sans-serif;
  font-weight:700;font-size:19px;line-height:1.2;
  letter-spacing:.01em;color:var(--plum);
  text-decoration:none;text-align:center;
  padding:9px 14px;border-radius:16px;
  background:linear-gradient(180deg,#fff,#ffeef2);
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 #fff, 0 2px 4px rgba(38,23,26,.05);
  transition:box-shadow var(--ease),transform var(--ease);
}
.mark:hover{box-shadow:var(--sh);transform:translateY(-1px)}

.find{flex:0 0 auto}
.find input{
  width:132px;height:42px;
  padding:0 16px;border-radius:999px;
  border:1px solid var(--line);background:#fff;
  font:inherit;font-size:16px;color:var(--ink);
  transition:width var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.find input::placeholder{color:#8d7379}
.find input:focus{
  width:200px;outline:none;
  border-color:var(--pink);
  box-shadow:0 0 0 3px rgba(235,135,156,.32);
}

/* 骨架 */
.shell{
  max-width:1180px;margin:0 auto;
  padding:clamp(14px,3vw,26px) clamp(14px,3vw,26px) clamp(24px,4vw,44px);
  display:grid;grid-template-columns:248px minmax(0,1fr);
  gap:clamp(18px,3vw,34px);
  align-items:start;
}
main{min-width:0}
div{min-width:0}

/* 侧栏 */
.rail{
  position:sticky;top:calc(64px + 14px);
  align-self:start;
  padding:16px 14px 18px;
  border:1px solid var(--line);border-radius:24px;
  background:rgba(255,255,255,.78);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  box-shadow:0 2px 4px rgba(38,23,26,.04);
}
.rail-h{
  font-size:16px;font-weight:700;margin:0 0 10px;line-height:1.4;
  color:var(--plum);
}
.rail-h > span{display:inline-block;border-bottom:3px solid var(--pink-soft);padding-bottom:1px}
.rail-list{
  list-style:none;counter-reset:r;
  margin:0 0 18px;padding:0;
  display:grid;gap:2px;
}
.rail-list li{counter-increment:r}
.rail-list li.off{display:none}
.rail-list a{
  display:flex;align-items:center;gap:9px;
  min-height:40px;padding:6px 9px;
  border:1px solid transparent;border-radius:12px;
  font-size:16px;color:var(--ink-2);text-decoration:none;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.rail-list a::before{
  content:counter(r,decimal-leading-zero);
  font-family:'Rubik',system-ui,sans-serif;
  font-size:12px;font-weight:600;letter-spacing:.04em;
  color:var(--pink-deep);opacity:.85;
}
.rail-list a:hover{background:#fff;border-color:var(--line-2);color:var(--ink)}
.rail-list a.hit{background:#fff3f6;border-color:var(--pink)}
.rail-top{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:40px;padding:0 16px;
  border-radius:999px;border:1px solid var(--line);
  background:#fff;color:var(--plum);
  font-size:16px;font-weight:600;text-decoration:none;
  transition:background var(--ease),color var(--ease);
}
.rail-top:hover{background:var(--plum);color:#fff;border-color:var(--plum)}

/* 头图 */
.hero{
  position:relative;isolation:isolate;
  display:flex;align-items:flex-end;
  min-height:45vh;
  overflow:hidden;
  border-radius:28px 28px 50% 50% / 28px 28px 62px 62px;
  background:linear-gradient(155deg,#ffb6c1 0%,#eb879c 52%,#c0687f 100%);
  box-shadow:var(--sh);
}
.hero-art{position:absolute;inset:0;z-index:0}
.hero-img{width:100%;height:100%;object-fit:cover}
.hero::after{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(38,23,26,.06) 0%,rgba(38,23,26,.32) 52%,rgba(38,23,26,.66) 100%);
}
.hero-in{position:relative;z-index:2;width:100%;padding:clamp(20px,4vw,44px)}
.hero h1{
  margin:0 0 18px;max-width:22ch;
  font-size:clamp(26px,4.4vw,44px);line-height:1.22;font-weight:700;
  color:#fff;text-shadow:0 2px 14px rgba(38,23,26,.42);
}
.hero-cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:0 24px;
  border-radius:999px;border:1px solid rgba(255,255,255,.7);
  background:#fff;color:var(--plum);
  font-size:16px;font-weight:700;text-decoration:none;
  box-shadow:0 4px 8px rgba(38,23,26,.14);
  transition:background var(--ease),color var(--ease),transform var(--ease);
}
.hero-cta:hover{background:var(--ink);color:#fff;border-color:var(--ink);transform:translateY(-2px)}

.band{
  height:10px;margin:20px auto 24px;max-width:560px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--pink-soft) 0%,var(--pink) 46%,var(--plum) 100%);
  opacity:.9;
}

/* 正文 */
.doc{display:grid;gap:clamp(16px,2.4vw,26px)}
.doc > section{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:clamp(20px,3.2vw,40px);
  scroll-margin-top:132px;
  transition:border-color var(--ease),background var(--ease);
}
.doc > section:hover{border-color:var(--line-2)}
section[id],.doc :is(h2,h3){scroll-margin-top:136px}

.doc h2{
  margin:0 0 16px;
  font-size:clamp(21px,2.5vw,29px);line-height:1.32;font-weight:700;
  color:var(--plum);
}
.doc h2 > span{display:inline-block;position:relative;padding-bottom:7px}
.doc h2 > span::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:7px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--pink),var(--pink-soft));
}
.doc h3{
  margin:26px 0 12px;
  font-size:18px;line-height:1.4;font-weight:700;color:var(--ink);
}
.doc h3 > span{display:inline-block;border-left:4px solid var(--pink);padding-left:10px}
.doc p,.doc li{color:var(--ink-2)}
.doc p:last-child,.doc ul:last-child,.doc ol:last-child{margin-bottom:0}
.doc ul,.doc ol{margin:0 0 1em;padding-left:1.25em}
.doc li{margin:.28em 0}
.doc a{
  color:var(--pink-deep);text-decoration:none;
  border-bottom:1px solid rgba(235,135,156,.6);
  transition:color var(--ease),border-color var(--ease);
}
.doc a:hover{color:var(--plum);border-color:var(--plum)}
.doc strong{color:var(--ink)}
.doc blockquote{
  margin:0 0 1em;padding:14px 18px;
  border-left:4px solid var(--pink-soft);border-radius:0 16px 16px 0;
  background:#fff4f7;
}
.doc img{border-radius:20px;margin:14px 0;border:1px solid var(--line)}
.doc table{width:100%;border-collapse:collapse;margin:0 0 1em;font-size:16px}
.doc th,.doc td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.doc th{background:#fff3f6;color:var(--plum);font-weight:700}
.doc code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:15px;background:#fff2f5;border-radius:6px;padding:1px 5px;
}

/* 页脚 */
.foot{
  max-width:1180px;margin:clamp(28px,4vw,52px) auto 0;
  padding:clamp(26px,4vw,44px) clamp(16px,3vw,26px) 30px;
  border-top:1px solid var(--line);
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:18px 16px;
  align-items:start;
}
.f-brand{
  margin:0;
  font-family:'Rubik',system-ui,sans-serif;
  font-weight:700;font-size:clamp(28px,4.6vw,44px);
  line-height:1.06;letter-spacing:-.02em;
  color:var(--plum);
}
.f-col{margin:4px 0 0;font-size:16px;line-height:2;color:var(--ink-2)}
.f-copy{
  grid-column:1 / -1;margin:6px 0 0;
  text-align:center;color:#7b6267;
}
.f-copy small{font-size:16px}

/* 断点 */
@media (max-width:1000px){
  .pills{justify-content:flex-start;overflow-x:auto;scrollbar-width:none}
  .pills::-webkit-scrollbar{display:none}
  .pill-set{flex:0 0 auto}
  .pill-set.set-a,.pill-set.set-b{justify-content:flex-start}
  .find input{width:120px}
  .find input:focus{width:150px}
}

/* 窄屏：正文先出，目录后置，头图收紧，保证 h1 落在首屏 */
@media (max-width:900px){
  .deck-in{flex-wrap:wrap;row-gap:6px;padding-top:8px;padding-bottom:8px}
  .mark{order:-2;padding:6px 8px;font-size:18px}
  .find{order:-1;margin-left:auto}
  .pills{order:2;flex:1 0 100%}
  .pill{padding:0 12px;min-height:40px}
  .pill-set{gap:6px}
  .mark{background:none;border:0;box-shadow:none}

  .shell{grid-template-columns:minmax(0,1fr);gap:16px}
  main{order:-1}
  .rail{order:2;position:static;border-radius:20px;padding:14px}
  .rail-list{grid-template-columns:1fr 1fr;gap:4px 8px;margin-bottom:14px}
  .rail-list a{padding:4px 8px}
  .rail-h{margin-bottom:8px}

  .hero{
    min-height:clamp(210px,38vh,300px);
    border-radius:26px 26px 46% 46% / 26px 26px 40px 40px;
    align-items:flex-start;
  }
  .hero-in{padding-top:clamp(18px,4vw,26px)}
  .hero h1{margin-bottom:14px;font-size:clamp(24px,6.4vw,32px)}
  .band{margin:16px auto 18px}

  .foot{grid-template-columns:1fr 1fr}
  .f-brand{grid-column:1 / -1}
}

@media (max-width:420px){
  body{font-size:16px}
  .rail-list{grid-template-columns:minmax(0,1fr)}
  .find input{width:96px;padding:0 12px}
  .find input:focus{width:120px}
  .hero h1{max-width:100%}
  .hero{min-height:clamp(190px,34vh,250px)}
  .foot{grid-template-columns:minmax(0,1fr)}
  .f-brand{grid-column:auto}
}

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