:root{
  --ink:#171f26;
  --ink-soft:#4d5f6c;
  --blue:#c8e0f4;
  --pink:#f5e0e8;
  --surface:#eaf1f8;
  --surface-hi:#f5f9fd;
  --line:#edccdb;
  --shadow:-6px -6px 14px rgba(255,255,255,.92),7px 7px 18px rgba(23,31,38,.13);
  --shadow-soft:-3px -3px 9px rgba(255,255,255,.9),4px 4px 12px rgba(23,31,38,.1);
  --shadow-in:inset -3px -3px 8px rgba(255,255,255,.95),inset 4px 4px 10px rgba(23,31,38,.11);
  --serif:'EB Garamond','Songti SC','Noto Serif SC','SimSun',Georgia,serif;
  --sans:'Lato','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--surface);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  overflow-x:hidden;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible{
  outline:2px solid #7ba7c9;
  outline-offset:2px;
}

.skip{
  position:absolute;
  left:12px;
  top:-52px;
  z-index:60;
  padding:10px 16px;
  border-radius:12px;
  background:var(--surface-hi);
  box-shadow:var(--shadow);
  text-decoration:none;
  font-size:16px;
  transition:top .15s ease;
}
.skip:focus{top:10px}

/* ---------- 顶部 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 16px;
  padding:10px clamp(12px,4vw,40px);
  background:var(--surface);
  box-shadow:0 6px 16px rgba(23,31,38,.08);
}

.brand,
.foot-brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:4px 12px 4px 4px;
  border-radius:14px;
  text-decoration:none;
  font-family:var(--serif);
  font-size:1.2rem;
  font-weight:600;
  letter-spacing:.05em;
}

.mark{
  width:34px;
  height:34px;
  flex:0 0 34px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:linear-gradient(145deg,#f7fbfe,#dbe8f4);
  box-shadow:var(--shadow-soft);
  font-family:var(--serif);
  font-size:1rem;
  color:var(--ink);
}

.mark-img{
  width:34px;
  height:34px;
  flex:0 0 34px;
  border-radius:50%;
  box-shadow:var(--shadow-soft);
  object-fit:cover;
}

.nav-shell{flex:1 1 auto;min-width:0}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.nav-item{position:relative}

.nav-list a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 14px;
  border-radius:12px;
  font-size:16px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  transition:box-shadow .15s ease,transform .15s ease;
}

.nav-list a:hover{
  background:linear-gradient(145deg,#f8fbfe,#e4eef7);
  box-shadow:var(--shadow-soft);
}

.nav-list a:active{box-shadow:var(--shadow-in);transform:scale(.98)}

.nav-list a[aria-current]{box-shadow:var(--shadow-in)}

.nav-sub{
  position:absolute;
  top:calc(100% + 8px);
  left:0;
  min-width:190px;
  margin:0;
  padding:8px;
  list-style:none;
  border-radius:14px;
  background:var(--surface-hi);
  box-shadow:var(--shadow);
  opacity:0;
  visibility:hidden;
  transform:translateY(-6px);
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
}

.has-sub:hover .nav-sub,
.has-sub:focus-within .nav-sub{
  opacity:1;
  visibility:visible;
  transform:none;
}

.nav-sub a{
  width:100%;
  min-height:44px;
  justify-content:flex-start;
  font-weight:400;
  padding:0 12px;
}

.search{
  display:flex;
  align-items:center;
  gap:6px;
  margin-left:auto;
  padding:4px 5px 4px 12px;
  border-radius:999px;
  background:linear-gradient(145deg,#f6fafd,#e2edf6);
  box-shadow:var(--shadow-in);
}

.search input{
  width:132px;
  min-width:0;
  border:0;
  background:transparent;
  padding:8px 0;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  outline:none;
}

.search button{
  min-height:40px;
  padding:0 16px;
  border:0;
  border-radius:999px;
  background:linear-gradient(145deg,#ffffff,#e6eef7);
  box-shadow:var(--shadow-soft);
  font:inherit;
  font-size:16px;
  font-weight:700;
  color:var(--ink);
  cursor:pointer;
  transition:box-shadow .15s ease,transform .15s ease;
}

.search button:active{box-shadow:var(--shadow-in);transform:scale(.97)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(16px,4vw,44px);
  min-height:45vh;
  max-width:1120px;
  margin:0 auto;
  padding:28px clamp(14px,4vw,40px);
}

.hero-tight{min-height:34vh}

.hero-bg{
  position:absolute;
  left:50%;
  top:50%;
  transform:translate(-50%,-50%);
  font-family:var(--serif);
  font-size:clamp(4rem,14vw,10rem);
  line-height:.9;
  letter-spacing:.08em;
  white-space:nowrap;
  color:rgba(23,31,38,.07);
  pointer-events:none;
  user-select:none;
}

.hero-art{
  position:relative;
  flex:0 0 auto;
  width:clamp(88px,13vw,132px);
  aspect-ratio:1/1;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:linear-gradient(145deg,#f8fbfe,#dae7f3);
  box-shadow:var(--shadow);
}

.hero-mark{width:58%;height:58%;color:var(--ink)}
.hero-img{width:58%;height:auto;border-radius:50%}

.hero-copy{
  position:relative;
  margin-left:auto;
  max-width:620px;
  text-align:right;
}

.hero h1{
  margin:0 0 12px;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(1.9rem,4.6vw,3.1rem);
  line-height:1.25;
  letter-spacing:.02em;
}

.hero-lead{
  margin:0;
  color:var(--ink-soft);
  font-size:1.02rem;
  line-height:1.7;
}

/* ---------- 主体 ---------- */
.wrap{
  display:flex;
  align-items:flex-start;
  gap:clamp(18px,3vw,34px);
  max-width:1120px;
  margin:0 auto;
  padding:6px clamp(12px,4vw,40px) 44px;
}

main{flex:1 1 auto;min-width:0}
.panel{min-width:0}

.doc article,
.doc div > article{
  scroll-margin-top:118px;
  margin:0 0 26px;
  padding:26px 24px 22px;
  border-radius:10px;
  border-bottom:3px solid var(--line);
  background:linear-gradient(145deg,#f6fafd,#e6eff8);
  box-shadow:var(--shadow);
}

.doc article:last-child{margin-bottom:0}

.doc small{
  display:block;
  margin-bottom:6px;
  font-size:.76rem;
  letter-spacing:.2em;
  color:#6d8296;
}

.doc h2,
.doc h3{
  font-family:var(--serif);
  font-weight:600;
  line-height:1.35;
  letter-spacing:.01em;
}

.doc h2{font-size:1.42rem;margin:0 0 14px}
.doc h3{font-size:1.14rem;margin:22px 0 10px}

.doc p{margin:0 0 1em;overflow-wrap:break-word}
.doc ul,.doc ol{margin:0 0 1em;padding-left:1.3em}
.doc li{margin:.35em 0}

.doc a{
  color:#2c4b64;
  text-decoration:underline;
  text-decoration-color:#cbabbb;
  text-underline-offset:4px;
}

.doc a:hover{color:#12232f;text-decoration-color:#8f6e80}

.doc blockquote{
  margin:0 0 1em;
  padding:14px 18px;
  border-radius:10px;
  background:var(--surface-hi);
  box-shadow:var(--shadow-in);
  color:var(--ink-soft);
}

.doc pre{
  overflow-x:auto;
  padding:14px 16px;
  border-radius:10px;
  background:#1d2831;
  color:#e9f2fa;
  font-size:15px;
  line-height:1.7;
}

.doc code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.95em}

.doc table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1em;
  font-size:16px;
}

.doc th,.doc td{
  padding:9px 10px;
  border-bottom:1px solid rgba(23,31,38,.12);
  text-align:left;
}

/* ---------- 侧栏 ---------- */
.rail{
  flex:0 0 264px;
  max-width:264px;
  position:sticky;
  top:96px;
}

.rail-card{
  padding:20px 18px 18px;
  border-radius:14px;
  border-bottom:3px solid var(--line);
  background:linear-gradient(145deg,#f8fbfe,#e2edf6);
  box-shadow:var(--shadow);
}

.rail-card small{
  display:block;
  margin-bottom:4px;
  font-size:.74rem;
  letter-spacing:.22em;
  color:#6d8296;
}

.rail-title{
  margin:0 0 12px;
  font-family:var(--serif);
  font-size:1.1rem;
  font-weight:600;
}

.rail-list{
  display:grid;
  gap:6px;
  margin:0;
  padding:0;
  list-style:none;
}

.rail-list a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:0 12px;
  border-radius:10px;
  font-size:16px;
  text-decoration:none;
  transition:box-shadow .15s ease;
}

.rail-list a:hover{
  box-shadow:var(--shadow-in);
  background:var(--surface-hi);
}

/* ---------- 页脚 ---------- */
.foot{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(12px,4vw,40px) 40px;
}

.foot-cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-bottom:22px;
  padding:28px clamp(18px,4vw,30px);
  border-radius:16px;
  border-bottom:3px solid #e2bdce;
  background:linear-gradient(145deg,#f9eff4,#eed9e3);
  box-shadow:var(--shadow);
}

.cta-title{
  margin:0;
  font-family:var(--serif);
  font-size:clamp(1.45rem,3.6vw,2rem);
  font-weight:600;
  letter-spacing:.04em;
}

.cta-btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 26px;
  border-radius:999px;
  background:linear-gradient(145deg,#ffffff,#f1dde7);
  box-shadow:var(--shadow-soft);
  font-weight:700;
  text-decoration:none;
  transition:box-shadow .15s ease,transform .15s ease;
}

.cta-btn:active{box-shadow:var(--shadow-in);transform:scale(.98)}

.foot-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 20px;
}

.foot-nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 10px;
  border-radius:10px;
  font-size:16px;
  color:var(--ink-soft);
  text-decoration:none;
  transition:box-shadow .15s ease,color .15s ease;
}

.foot-nav a:hover{color:var(--ink);box-shadow:var(--shadow-in)}

.foot-copy{
  flex:1 1 auto;
  margin:0;
  text-align:center;
  font-size:16px;
  color:#5b7285;
}

/* ---------- 滚动出现 ---------- */
.reveal-ready .doc > article,
.reveal-ready .rail-card,
.reveal-ready .hero-copy,
.reveal-ready .hero-art,
.reveal-ready .foot-cta{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s ease,transform .5s ease;
}

.reveal-ready .in{
  opacity:1;
  transform:none;
}

/* ---------- 移动端 ---------- */
@media (max-width:860px){
  body{font-size:17px}

  .top{gap:8px 10px;padding:8px 12px}

  .nav-shell{
    order:3;
    flex:1 0 100%;
    min-width:0;
  }

  .nav-list{
    gap:6px;
    overflow-x:auto;
    padding:2px 0 6px;
    scrollbar-width:none;
  }

  .nav-list::-webkit-scrollbar{display:none}

  .has-sub,
  .has-sub .nav-sub{display:contents}

  .nav-list a{
    white-space:nowrap;
    min-height:44px;
    padding:0 12px;
    font-weight:400;
    background:linear-gradient(145deg,#f8fbfe,#e6eff8);
    box-shadow:var(--shadow-soft);
  }

  .search{flex:0 1 auto}
  .search input{width:96px}

  .hero,
  .hero-tight{
    flex-direction:column;
    align-items:flex-end;
    justify-content:center;
    gap:14px;
    min-height:0;
    padding:22px 14px 26px;
  }

  .hero-bg{font-size:clamp(3.2rem,17vw,6rem);letter-spacing:.06em}

  .hero-art{width:74px}

  .hero-copy{max-width:100%;text-align:right}

  .hero h1{font-size:clamp(1.55rem,6.6vw,2.1rem)}

  .wrap{
    flex-direction:column;
    gap:22px;
    padding:4px 12px 32px;
  }

  .rail{
    position:static;
    flex:1 1 auto;
    width:100%;
    max-width:none;
    order:2;
  }

  .doc article,
  .doc div > article{
    padding:20px 16px 16px;
    scroll-margin-top:150px;
  }

  .doc h2{font-size:1.26rem}

  .foot{padding:0 12px 32px}

  .foot-cta{padding:22px 18px}

  .foot-row{flex-direction:column;align-items:flex-start}
  .foot-copy{text-align:left}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important}
}

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