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

:root{
  --paper:#ffffff;
  --stone:#f5f5f5;
  --ink:#1f1f1f;
  --ink-soft:#55555a;
  --line:rgba(31,31,31,.12);
  --shadow:0 10px 26px rgba(31,31,31,.07);
  --shadow-up:0 18px 40px rgba(31,31,31,.13);
  --r:18px;
  --r-lg:26px;
  --serif:"Bodoni Moda","Songti SC",Georgia,serif;
  --sans:"Jost","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --head-h:118px;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--stone);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.78;
  font-weight:400;
  letter-spacing:.012em;
}

img{display:block;max-width:100%;height:auto}

a{color:inherit}

h1,h2,h3{
  margin:0;
  font-family:var(--serif);
  font-weight:500;
  line-height:1.22;
  letter-spacing:.02em;
}

hr{
  border:0;
  border-top:1px solid var(--line);
  margin:12px 0 16px;
}

:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}

/* 顶栏：品牌独占一行，菜单为药丸胶囊组 */
.head{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}

.head-in{
  max-width:1320px;
  margin:0 auto;
  padding:12px clamp(18px,4vw,48px) 10px;
}

.brand-row{display:flex}

.brand{
  display:inline-block;
  padding:4px 0;
  font-family:var(--serif);
  font-size:clamp(1.35rem,2.4vw,1.72rem);
  letter-spacing:.18em;
  line-height:1.24;
  text-decoration:none;
}

.menu-row{margin-top:6px}

.pills{
  display:flex;
  gap:8px;
  overflow-x:auto;
  scrollbar-width:none;
  padding-bottom:4px;
}

.pills::-webkit-scrollbar{display:none}

.pill{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 17px;
  border-radius:999px;
  background:var(--stone);
  border:1px solid rgba(31,31,31,.08);
  color:var(--ink-soft);
  font-size:16px;
  text-decoration:none;
  transition:background .24s ease,color .24s ease,border-color .24s ease;
}

.pill:hover,.pill:focus-visible{
  background:var(--ink);
  border-color:var(--ink);
  color:#fff;
}

/* 主体：左侧目录 aside + 右侧内容列 */
main{
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:20px;
  max-width:1320px;
  margin:0 auto;
  padding:24px clamp(18px,4vw,48px) 64px;
  align-items:start;
}

main > div,
main > section{grid-column:2}

/* 首屏 */
.hero{
  grid-column:1 / -1;
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1fr);
  gap:clamp(20px,4vw,54px);
  align-items:center;
  min-height:calc(100vh - var(--head-h));
  min-height:calc(100svh - var(--head-h));
  padding:clamp(18px,2.6vw,32px);
  background:var(--paper);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow);
}

.hero-media{
  position:relative;
  margin:0;
  overflow:hidden;
  aspect-ratio:4 / 5;
  min-height:300px;
  border-radius:20px;
  background:linear-gradient(150deg,#efefef,#e2e2e2);
  box-shadow:var(--shadow);
}

.hero-media .shot{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:0;
}

.hero-media:not(.rot) .shot{opacity:1}

.hero-media.rot .shot{animation:shotCycle 15s linear infinite}

.hero-media.rot .shot:nth-child(2){animation-delay:5s}
.hero-media.rot .shot:nth-child(3){animation-delay:10s}

@keyframes shotCycle{
  0%{opacity:1}
  30%{opacity:1}
  38%{opacity:0}
  100%{opacity:0}
}

.hero-media .ph{
  position:absolute;
  inset:0;
  background:linear-gradient(150deg,#ededed,#e0e0e0);
}

.hero-copy{text-align:center}

.hero-copy h1{
  font-size:clamp(2rem,4.6vw,3.3rem);
  letter-spacing:.04em;
}

.hero-rule{
  width:64px;
  margin:18px auto 16px;
  border-top:1px solid rgba(31,31,31,.28);
}

.hero-copy .lead{
  margin:0 auto;
  max-width:30em;
  color:var(--ink-soft);
  font-size:16px;
  line-height:1.85;
}

/* 左侧目录 */
.toc{
  grid-column:1;
  grid-row:2 / span 90;
  align-self:start;
  position:sticky;
  top:calc(var(--head-h) + 14px);
  padding:16px 18px 18px;
  background:var(--paper);
  border-radius:var(--r);
  box-shadow:var(--shadow);
}

.toc h2{
  font-size:1.02rem;
  letter-spacing:.22em;
}

.toc ol{
  list-style:none;
  margin:0;
  padding:0;
}

.toc a{
  display:flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  color:var(--ink-soft);
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:color .2s ease,padding-left .2s ease;
}

.toc li:last-child a{border-bottom:0}

.toc a:hover,.toc a:focus-visible{
  color:var(--ink);
  padding-left:4px;
}

/* 正文卡片 */
main > div:not(.hero){
  scroll-margin-top:calc(var(--head-h) + 18px);
  padding:clamp(22px,2.8vw,38px);
  background:var(--paper);
  border-radius:var(--r);
  box-shadow:var(--shadow);
  transition:box-shadow .3s ease;
}

main > div:not(.hero):hover{box-shadow:var(--shadow-up)}

main > div:not(.hero) h2{
  font-size:clamp(1.38rem,2.4vw,1.86rem);
  margin-bottom:2px;
}

main > div:not(.hero) h3{
  font-size:1.14rem;
  margin:22px 0 4px;
}

main > div:not(.hero) p{
  margin:0 0 14px;
  color:#2b2b2e;
}

main > div:not(.hero) ul,
main > div:not(.hero) ol{
  margin:0 0 14px;
  padding-left:1.25em;
}

main > div:not(.hero) li{margin:6px 0}

main > div:not(.hero) a{
  color:var(--ink);
  text-underline-offset:3px;
}

main > div:not(.hero) blockquote{
  margin:16px 0;
  padding:2px 0 2px 16px;
  border-left:2px solid var(--line);
  color:var(--ink-soft);
}

main > div:not(.hero) figure{margin:14px 0}

main > div:not(.hero) img{border-radius:14px}

/* 页脚：四栏 + 大召唤块 + 居中底栏 */
.foot{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;
  max-width:1320px;
  margin:0 auto;
  padding:clamp(26px,4vw,52px) clamp(18px,4vw,48px) 24px;
}

.f-cta{
  grid-column:1 / -1;
  padding:clamp(24px,4vw,46px);
  background:var(--ink);
  color:#fff;
  border-radius:var(--r-lg);
  box-shadow:var(--shadow-up);
}

.f-cta h2{
  font-size:clamp(1.65rem,4.2vw,2.6rem);
  letter-spacing:.08em;
}

.f-cta hr{border-top-color:rgba(255,255,255,.26)}

.cta-pill{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 22px;
  border-radius:999px;
  background:#fff;
  color:var(--ink);
  font-size:16px;
  text-decoration:none;
  transition:transform .25s ease;
}

.cta-pill:hover,.cta-pill:focus-visible{transform:translateY(-2px)}

.f-brand{padding-top:6px}

.wordmark{
  margin:0;
  font-family:var(--serif);
  font-size:1.08rem;
  letter-spacing:.16em;
}

.f-nav{grid-column:2 / span 2}

.f-nav nav dl{margin:0}

.f-nav dt{
  margin-bottom:6px;
  font-family:var(--serif);
  font-size:1rem;
  letter-spacing:.12em;
  color:var(--ink);
}

.f-nav dd{margin:0}

.f-nav a{
  display:flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  color:var(--ink-soft);
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:color .2s ease;
}

.f-nav a:hover,.f-nav a:focus-visible{color:var(--ink)}

.f-mark{
  grid-column:4;
  display:flex;
  justify-content:flex-end;
}

.f-mark span{
  font-family:var(--serif);
  font-size:2.2rem;
  line-height:1;
  letter-spacing:.06em;
}

.f-bar{
  grid-column:1 / -1;
  margin-top:6px;
  padding-top:16px;
  border-top:1px solid var(--line);
  text-align:center;
}

.f-bar p{
  margin:0;
  font-size:16px;
  color:var(--ink-soft);
  letter-spacing:.1em;
}

/* 滚动显现 */
.js .rv{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .7s ease,transform .7s ease;
}

.js .rv.in{
  opacity:1;
  transform:none;
}

@media (max-width:1040px){
  main{grid-template-columns:200px minmax(0,1fr)}
}

@media (max-width:980px){
  main{
    grid-template-columns:minmax(0,1fr);
    gap:16px;
    padding-bottom:48px;
  }

  main > div,
  main > section,
  main > aside,
  .hero{grid-column:1}

  .toc{
    grid-row:auto;
    position:static;
    top:auto;
  }

  .toc ol{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
  }

  .toc li{width:auto}

  .toc a{
    min-height:40px;
    padding:0 14px;
    border:1px solid var(--line);
    border-radius:999px;
  }

  .toc a:hover,.toc a:focus-visible{padding-left:14px}

  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
    padding:22px;
  }

  .hero-copy{order:-1}

  .hero-media{
    aspect-ratio:16 / 10;
    min-height:0;
  }
}

@media (max-width:760px){
  .foot{grid-template-columns:minmax(0,1fr);gap:20px}

  .f-cta,
  .f-bar{grid-column:1}

  .f-nav,
  .f-mark{grid-column:1}

  .f-mark{justify-content:flex-start}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}

  .js .rv{
    opacity:1;
    transform:none;
    transition:none;
  }

  .hero-media.rot .shot{
    animation:none;
    opacity:1;
  }

  .hero-media.rot .shot:nth-child(n+2){display:none}

  .cta-pill,.pill,.toc a{transition:none}
}

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