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

:root{
  --paper:#ffffff;
  --mist:#f5f5f5;
  --ink:#1f1f1f;
  --ink2:#4b4b4b;
  --line:#e4e4e4;
  --serif:'EB Garamond','Songti SC','Noto Serif SC',Georgia,'Times New Roman',serif;
  --sans:'Lato','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  --r:18px;
  --e1:0 1px 2px rgba(31,31,31,.06),0 3px 9px rgba(31,31,31,.05);
  --e2:0 6px 16px rgba(31,31,31,.07),0 16px 34px rgba(31,31,31,.07);
  --e3:0 14px 30px rgba(31,31,31,.10),0 34px 66px rgba(31,31,31,.09);
  --e4:0 24px 52px rgba(31,31,31,.14),0 60px 110px rgba(31,31,31,.12);
}

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

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

body{
  margin:0;
  color:var(--ink);
  font-family:var(--sans);
  font-size:1.0625rem;
  line-height:1.78;
  overflow-x:clip;
  background:
    radial-gradient(880px 520px at 84% -8%, #ffffff 0%, rgba(255,255,255,0) 68%),
    radial-gradient(680px 460px at 2% 34%, #ffffff 0%, rgba(255,255,255,0) 64%),
    var(--mist);
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%}
::selection{background:var(--ink);color:#fff}
a:focus-visible,button:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:10px}

.skip{
  position:absolute;left:12px;top:-90px;z-index:120;
  padding:10px 16px;background:var(--ink);color:#fff;border-radius:12px;
  text-decoration:none;font-size:1rem;transition:top .2s;
}
.skip:focus{top:12px}

/* ---------- 顶部 ---------- */
.top{
  position:sticky;top:0;z-index:40;
  background:rgba(255,255,255,.86);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid var(--line);
  box-shadow:var(--e1);
}
.top-row{
  max-width:1180px;margin:0 auto;padding:10px 20px;
  display:grid;grid-template-columns:auto 1fr auto 1fr auto;
  align-items:center;gap:10px;
}
.primary{display:contents}
.nav-l{grid-column:2;grid-row:1;justify-self:end}
.nav-r{grid-column:4;grid-row:1;justify-self:start}
.brand{grid-column:3;grid-row:1;justify-self:center}
.cta{grid-column:5;grid-row:1}
.burger{grid-column:1;grid-row:1}

.nav-side{display:flex;gap:2px;list-style:none;margin:0;padding:0}
.nav-side a{
  display:inline-flex;align-items:center;min-height:44px;padding:0 11px;
  font-size:1rem;color:var(--ink);text-decoration:none;border-radius:12px;
  transition:background .22s ease,color .22s ease,box-shadow .22s ease;
}
.nav-side a:hover{background:var(--ink);color:#fff;box-shadow:var(--e2)}

.brand{
  font-family:var(--serif);font-weight:600;font-size:1.32rem;letter-spacing:.03em;
  color:var(--ink);text-decoration:none;white-space:nowrap;
  padding:7px 16px;background:var(--paper);border:1px solid var(--line);
  border-radius:14px;box-shadow:var(--e1);
  transition:transform .25s ease,box-shadow .25s ease;
}
.brand:hover{transform:translateY(-2px);box-shadow:var(--e2)}

.cta{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:0 18px;font-size:1rem;
  background:var(--ink);color:#fff;text-decoration:none;border-radius:14px;
  box-shadow:var(--e2);transition:transform .25s ease,box-shadow .25s ease;
}
.cta:hover{transform:translateY(-2px);box-shadow:var(--e3)}

.burger{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:46px;height:44px;padding:0 12px;cursor:pointer;
  background:var(--paper);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--e1);transition:transform .25s ease,box-shadow .25s ease;
}
.burger:hover{transform:translateY(-2px);box-shadow:var(--e2)}
.burger-bar{display:block;height:2px;background:var(--ink);border-radius:2px}

.rail{border-top:1px solid var(--line);background:rgba(245,245,245,.78)}
.rail-nav{max-width:1180px;margin:0 auto;padding:0 20px}
.rail-nav ol{
  display:flex;gap:6px;list-style:none;margin:0;padding:6px 0;
  overflow-x:auto;scrollbar-width:thin;
}
.rail-nav a{
  display:inline-flex;align-items:center;min-height:40px;padding:0 12px;
  white-space:nowrap;font-size:1rem;color:var(--ink2);text-decoration:none;
  border:1px solid transparent;border-radius:11px;
  transition:background .22s ease,box-shadow .22s ease,color .22s ease;
}
.rail-nav a:hover,.rail-nav a[aria-current="true"]{
  background:var(--paper);border-color:var(--line);color:var(--ink);box-shadow:var(--e1);
}

/* ---------- 全屏菜单 ---------- */
.menu{
  position:fixed;inset:0;z-index:90;
  display:flex;flex-direction:column;justify-content:center;gap:26px;
  padding:88px 26px 40px;overflow-y:auto;
  background:rgba(255,255,255,.95);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  transform:translateY(-102%);
  transition:transform .48s cubic-bezier(.22,.8,.28,1);
}
.menu[data-open="true"]{transform:translateY(0)}
.menu-top{
  position:absolute;top:18px;left:24px;right:24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.menu-name{font-family:var(--serif);font-size:1.2rem;font-weight:600;letter-spacing:.03em}
.menu-close{
  min-height:44px;padding:0 18px;font-size:1rem;cursor:pointer;
  background:var(--paper);color:var(--ink);border:1px solid var(--line);
  border-radius:12px;box-shadow:var(--e1);
}
.menu-nav ol{list-style:none;margin:0 auto;padding:0;max-width:620px;width:100%}
.menu-nav li+li{border-top:1px solid var(--line)}
.menu-nav a{
  display:flex;align-items:center;min-height:56px;
  font-family:var(--serif);font-size:1.5rem;color:var(--ink);text-decoration:none;
  padding:0 8px;transition:transform .25s ease,color .25s ease;
}
.menu-nav a:hover{transform:translateX(8px);color:#000}

/* ---------- 主体骨架 ---------- */
main{
  position:relative;z-index:1;
  max-width:1180px;margin:0 auto;
  padding:26px 20px 64px;
  display:grid;grid-template-columns:250px minmax(0,1fr);
  gap:34px 36px;
}
main > section[id]{scroll-margin-top:132px}

.hero{
  grid-column:1 / -1;grid-row:1;
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:30px;align-items:center;min-height:45vh;padding:14px 0 6px;
}
.hero-copy{position:relative;z-index:2}
h1{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(2.05rem,5.2vw,3.5rem);line-height:1.12;
  letter-spacing:-.012em;margin:.1em 0 .45em;
}
.lede{margin:0;color:var(--ink2);max-width:36ch;font-size:1.0625rem}

.hero-art{
  position:relative;z-index:1;margin:0;
  aspect-ratio:4/3;border-radius:22px;box-shadow:var(--e4);
}
.hero-art::before,.hero-art::after{
  content:"";position:absolute;inset:0;border-radius:22px;z-index:-1;
}
.hero-art::before{background:var(--paper);box-shadow:var(--e2);transform:translate(15px,15px) rotate(1.3deg)}
.hero-art::after{background:linear-gradient(140deg,#ffffff,#e8e8e8);box-shadow:var(--e1);transform:translate(-15px,22px) rotate(-1.7deg)}
.hero-img,.hero-fill{
  position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;border-radius:22px;display:block;
}
.hero-fill{background:linear-gradient(150deg,#1f1f1f,#4a4a4a 52%,#2a2a2a)}
.badge{
  position:absolute;left:-14px;bottom:20px;z-index:3;
  padding:9px 16px;border-radius:14px;font-size:1rem;
  background:rgba(255,255,255,.78);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:var(--e3);white-space:nowrap;color:var(--ink);
}

/* 左侧目录 */
.side{grid-column:1;grid-row:2;align-self:start}
.toc{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--e2);padding:20px 18px;
}
.toc h3{font-family:var(--serif);font-size:1.18rem;font-weight:600;margin:0 0 .5em}
.toc hr{border:0;border-top:1px solid var(--line);margin:0 0 12px}
.toc ol{list-style:none;margin:0;padding:0;display:grid;gap:3px}
.toc a{
  display:flex;align-items:center;min-height:40px;padding:0 10px;
  font-size:1rem;color:var(--ink2);text-decoration:none;border-radius:10px;
  transition:background .2s ease,color .2s ease,padding .2s ease;
}
.toc a:hover{background:var(--mist);color:var(--ink);padding-left:14px}

/* 正文区块 */
main > section:not(.hero):not(.side){
  grid-column:2;position:relative;
  margin-top:-12px;padding:30px 34px;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--e2);
  transition:box-shadow .35s ease,transform .35s ease;
}
main > section:not(.hero):not(.side):hover{box-shadow:var(--e3);transform:translateY(-3px)}
main > section:not(.hero):not(.side)::after{
  content:"";position:absolute;left:34px;bottom:0;height:3px;width:52px;
  background:var(--ink);border-radius:3px;
  transition:width .5s cubic-bezier(.22,.8,.28,1);
}
main > section:not(.hero):not(.side):hover::after{width:calc(100% - 68px)}

main h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(1.45rem,3.1vw,2rem);line-height:1.26;
  margin:0 0 .4em;letter-spacing:-.01em;
}
main h3{font-family:var(--serif);font-weight:600;font-size:1.25rem;margin:1.5em 0 .5em}
main hr{border:0;border-top:1px solid var(--line);margin:0 0 1.15em}
main p{max-width:66ch;margin:0 0 1em}
main ul,main ol{padding-left:1.25em;max-width:66ch}
main li{margin:.35em 0}
main blockquote{
  margin:1.3em 0;padding:14px 18px;border-left:3px solid var(--ink);
  background:var(--mist);border-radius:0 14px 14px 0;box-shadow:var(--e1);
}
main blockquote p:last-child{margin:0}
main > section a{
  color:var(--ink);text-decoration:underline;
  text-decoration-thickness:1px;text-underline-offset:4px;
}
main > section a:hover{background:var(--mist)}
main figure{margin:1.2em 0}
main figcaption{font-size:1rem;color:var(--ink2);margin-top:.5em}
main aside{
  background:var(--mist);border:1px solid var(--line);border-radius:14px;
  padding:16px 18px;box-shadow:var(--e1);
}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;z-index:1;
  max-width:1180px;margin:0 auto;padding:26px 20px 44px;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;
  border-top:1px solid var(--line);
}
.foot-brand .brand{font-size:1.1rem;padding:6px 14px}
.foot-nav ol{
  display:flex;flex-wrap:wrap;gap:4px;justify-content:center;
  list-style:none;margin:0;padding:0;
}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:40px;padding:0 10px;
  font-size:1rem;color:var(--ink2);text-decoration:none;border-radius:10px;
  transition:background .2s ease,color .2s ease,box-shadow .2s ease;
}
.foot-nav a:hover{background:var(--paper);color:var(--ink);box-shadow:var(--e1)}
.foot-legal p{margin:0;font-size:1rem;color:var(--ink2);white-space:nowrap;text-align:right}

/* ---------- 滚动浮起 ---------- */
.rv{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.22,.8,.28,1)}
.rv.in{opacity:1;transform:none}

/* ---------- 窄屏 ---------- */
@media (max-width:900px){
  .nav-side{display:none}
  .top-row{grid-template-columns:auto 1fr auto}
  .burger{grid-column:1}
  .brand{grid-column:2}
  .cta{grid-column:3}
  main{grid-template-columns:1fr;gap:20px;padding:18px 16px 48px}
  .hero{grid-template-columns:1fr;min-height:0;gap:22px;padding-top:6px}
  .hero-art{order:-1;aspect-ratio:16/10}
  .badge{left:12px;bottom:12px}
  .side{grid-column:1;grid-row:auto}
  main > section:not(.hero):not(.side){grid-column:1;margin-top:0;padding:22px 20px}
  main > section:not(.hero):not(.side)::after{left:20px}
  main > section:not(.hero):not(.side):hover::after{width:calc(100% - 40px)}
  .foot{grid-template-columns:1fr;justify-items:center;text-align:center;gap:12px;padding-bottom:36px}
  .foot-legal p{text-align:center}
  main > section[id]{scroll-margin-top:150px}
}

@media (min-width:901px){
  .menu-nav a{font-size:1.7rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important}
  .rv{opacity:1;transform:none}
}

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