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

:root{
  --ink:#1f1f1f;
  --paper:#ffffff;
  --fog:#f5f5f5;
  --line:#e6e6e6;
  --line-strong:#c9c9c9;
  --muted:#6e6e6e;
  --r:28px;
  --e1:0 1px 2px rgba(31,31,31,.06),0 2px 8px rgba(31,31,31,.05);
  --e2:0 2px 6px rgba(31,31,31,.06),0 12px 26px rgba(31,31,31,.08);
  --e3:0 6px 14px rgba(31,31,31,.08),0 24px 48px rgba(31,31,31,.10);
  --e4:0 12px 30px rgba(31,31,31,.12),0 40px 80px rgba(31,31,31,.16);
  --serif:'Cinzel','Songti SC','SimSun',Georgia,serif;
  --sans:'Josefin Sans',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.78;
  color:var(--ink);
  background:
    radial-gradient(1100px 560px at 82% -12%,#ffffff,transparent 70%),
    radial-gradient(880px 520px at 6% 6%,#ffffff,transparent 66%),
    var(--fog);
  overflow-x:hidden;
}

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

a{color:var(--ink)}

.shell{
  max-width:1220px;
  margin:0 auto;
  padding:0 16px;
  position:relative;
  z-index:1;
}

/* ---------- 顶部 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(16px) saturate(1.1);
  backdrop-filter:blur(16px) saturate(1.1);
  border-bottom:1px solid var(--line);
}

.strip{background:var(--ink);color:#fff}

.strip-t{
  margin:0;
  padding:7px 14px;
  font-size:13px;
  line-height:1.4;
  letter-spacing:.24em;
  text-align:center;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:8px 0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:2px 0;
  text-decoration:none;
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  letter-spacing:.1em;
  font-weight:600;
}

.brand-mark{
  display:block;
  width:26px;
  height:26px;
  border-radius:8px;
  object-fit:cover;
  box-shadow:var(--e2);
}

.burger{
  min-height:44px;
  min-width:44px;
  padding:10px 16px;
  font-family:var(--sans);
  font-size:16px;
  letter-spacing:.12em;
  color:var(--ink);
  background:var(--paper);
  border:1px solid var(--line-strong);
  border-radius:999px;
  box-shadow:var(--e1);
  cursor:pointer;
  transition:box-shadow .3s,transform .3s;
}

.burger:hover{box-shadow:var(--e3);transform:translateY(-1px)}
.burger:focus-visible{outline:2px solid var(--ink);outline-offset:2px}

.dock{
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
  border-top:1px solid var(--line);
  padding:6px 0 8px;
}

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

.dock p{
  display:flex;
  align-items:center;
  gap:6px;
  margin:0;
  justify-content:flex-start;
  min-width:max-content;
}

.dock a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  font-size:16px;
  line-height:1.3;
  text-decoration:none;
  color:var(--ink);
  border:1px solid transparent;
  border-radius:999px;
  white-space:nowrap;
  transition:background .28s,box-shadow .28s,border-color .28s,transform .28s;
}

.dock a:hover{background:var(--paper);border-color:var(--line);box-shadow:var(--e2);transform:translateY(-1px)}
.dock a.on{background:var(--ink);color:#fff;border-color:var(--ink);box-shadow:var(--e3)}

/* ---------- 全屏遮罩菜单 ---------- */
.veil{
  position:fixed;
  inset:0;
  z-index:70;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px 20px;
  background:rgba(245,245,245,.84);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  visibility:hidden;
  opacity:0;
  transition:opacity .3s ease,visibility .3s ease;
}

.veil.on{visibility:visible;opacity:1}

.veil-in{
  width:100%;
  max-width:520px;
  max-height:88vh;
  overflow:auto;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--e4);
  padding:26px 24px 24px;
}

.veil-brand{
  margin:0 0 12px;
  font-family:var(--serif);
  font-size:14px;
  letter-spacing:.24em;
  color:var(--muted);
}

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

.veil-list a{
  display:flex;
  align-items:center;
  min-height:48px;
  padding:10px 2px;
  font-size:18px;
  text-decoration:none;
  color:var(--ink);
  border-bottom:1px solid var(--line);
}

.veil-list a:hover{padding-left:6px}

.veil-close{
  margin-top:18px;
  width:100%;
  min-height:48px;
  padding:12px;
  font-family:var(--sans);
  font-size:16px;
  letter-spacing:.16em;
  color:#fff;
  background:var(--ink);
  border:1px solid var(--ink);
  border-radius:999px;
  cursor:pointer;
}

/* ---------- 主体 ---------- */
main{display:block;padding:20px 0 56px}

main > div{
  position:relative;
  z-index:1;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--e1);
  padding:26px 22px 34px;
  margin-bottom:20px;
  scroll-margin-top:158px;
  transition:box-shadow .36s ease,transform .36s ease;
}

main > div::after{
  content:"";
  position:absolute;
  left:22px;
  right:22px;
  bottom:13px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--ink),rgba(31,31,31,0));
  opacity:.32;
}

main > div:hover{box-shadow:var(--e3);transform:translateY(-3px)}

main > div h2{
  font-family:var(--serif);
  font-size:clamp(1.2rem,3.6vw,1.6rem);
  line-height:1.42;
  font-weight:600;
  letter-spacing:.02em;
  margin:2px 0 14px;
  padding-left:14px;
  border-left:3px solid var(--ink);
}

main > div h3{
  font-family:var(--serif);
  font-size:clamp(1.05rem,3vw,1.25rem);
  line-height:1.5;
  margin:22px 0 10px;
  font-weight:600;
}

main > div p{margin:0 0 14px}
main > div p:last-child{margin-bottom:0}

main > div ul,
main > div ol{margin:0 0 14px;padding-left:1.25em}
main > div li{margin:6px 0}

main > div a{
  color:var(--ink);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

main > div blockquote{
  margin:18px 0;
  padding:14px 18px;
  border-left:3px solid var(--line-strong);
  background:var(--fog);
  border-radius:0 18px 18px 0;
  color:#3d3d3d;
}

main > div table{
  width:100%;
  border-collapse:collapse;
  font-size:16px;
  margin:0 0 14px;
}

main > div th,
main > div td{
  border-bottom:1px solid var(--line);
  padding:9px 8px;
  text-align:left;
}

main > div code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.94em;
  background:var(--fog);
  border-radius:6px;
  padding:1px 5px;
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:70vh;
  display:flex;
  align-items:center;
  padding:9vh 6vw 11vh;
  overflow:hidden;
  border-radius:var(--r);
  background:var(--paper);
  box-shadow:var(--e2);
  isolation:isolate;
}

.hero::after{display:none}

.hero-mesh{
  position:absolute;
  inset:-10%;
  z-index:0;
  background-image:radial-gradient(rgba(31,31,31,.2) 1px,transparent 1px);
  background-size:22px 22px;
  opacity:.55;
  -webkit-mask-image:radial-gradient(120% 90% at 22% 30%,#000 20%,transparent 76%);
  mask-image:radial-gradient(120% 90% at 22% 30%,#000 20%,transparent 76%);
  will-change:transform;
}

.hero-plate{
  position:absolute;
  z-index:0;
  right:-40px;
  bottom:-60px;
  width:300px;
  height:300px;
  border-radius:48px;
  background:linear-gradient(140deg,rgba(255,255,255,.96),rgba(245,245,245,.72));
  border:1px solid var(--line);
  box-shadow:var(--e4);
  transform:rotate(12deg) translateZ(0);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}

.hero-in{
  position:relative;
  z-index:3;
  max-width:760px;
}

.hero-brow{
  margin:0;
  font-family:var(--serif);
  font-size:13px;
  letter-spacing:.3em;
  color:var(--muted);
}

.hero h1{
  margin:16px 0 18px;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(2rem,7.2vw,4.1rem);
  line-height:1.14;
  letter-spacing:.01em;
}

.hero-sub{
  margin:0;
  max-width:46ch;
  color:#4a4a4a;
  font-size:16px;
  line-height:1.85;
}

/* ---------- 侧栏 ---------- */
.rail{
  background:transparent;
  border:0;
  box-shadow:none;
  padding:0;
  margin-bottom:0;
  overflow:visible;
}

.rail::after{display:none}
.rail:hover{transform:none;box-shadow:none}

.rail-card{
  position:sticky;
  top:158px;
  z-index:2;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--e3);
  padding:20px 18px 22px;
}

.rail-h{
  margin:0 0 12px;
  padding-left:0;
  border-left:0;
  font-family:var(--sans);
  font-size:14px;
  letter-spacing:.2em;
  font-weight:500;
  color:var(--muted);
}

.rail-h span{display:inline-block;padding-bottom:6px;border-bottom:2px solid var(--ink)}

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

.rail-list a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:9px 0;
  font-size:15px;
  line-height:1.4;
  text-decoration:none;
  color:#3a3a3a;
  border-bottom:1px dashed var(--line);
  transition:padding-left .25s,color .25s;
}

.rail-list li:last-child a{border-bottom:0}
.rail-list a:hover{padding-left:5px;color:var(--ink)}

/* ---------- 收尾块 ---------- */
.closer{
  display:grid;
  justify-items:center;
  gap:20px;
  padding:38px 22px 44px;
  background:linear-gradient(180deg,var(--paper),var(--fog));
}

.closer-h{
  margin:0;
  padding-left:0;
  border-left:0;
  font-size:clamp(1.1rem,3.4vw,1.45rem);
  letter-spacing:.1em;
  text-align:center;
}

.closer-h span{display:inline-block}

.stack{
  position:relative;
  width:210px;
  height:132px;
  margin:0;
  perspective:820px;
}

.plate{
  position:absolute;
  inset:0;
  border-radius:24px;
  border:1px solid var(--line);
  background:var(--paper);
  box-shadow:var(--e2);
}

.plate-a{transform:rotate(-7deg) translate(-24px,12px) translateZ(-40px);opacity:.62}
.plate-b{transform:rotate(5deg) translate(18px,-6px) translateZ(-14px);opacity:.82}
.plate-c{transform:translateZ(24px);box-shadow:var(--e4)}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;
  z-index:2;
  margin:26px 0 40px;
  padding:36px 24px 20px;
  background:var(--ink);
  color:#f3f3f3;
  border-radius:var(--r);
  box-shadow:var(--e4);
}

.foot-main{
  display:grid;
  grid-template-columns:1fr;
  gap:26px;
}

.foot-mark{
  margin:0 0 10px;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(1.9rem,9vw,4.4rem);
  line-height:1;
  letter-spacing:.03em;
  color:#fff;
}

.foot-addr{
  font-style:normal;
  font-size:15px;
  line-height:1.7;
  color:#c3c3c3;
}

.foot-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 14px;
}

.foot-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 0;
  font-size:15px;
  text-decoration:none;
  color:#ececec;
  border-bottom:1px solid rgba(255,255,255,.12);
}

.foot-nav a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

.foot-base{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  margin-top:26px;
  padding-top:14px;
  border-top:1px solid rgba(255,255,255,.16);
  font-size:14px;
  color:#b6b6b6;
}

.foot-base p{margin:0}

.foot-top a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:4px 2px;
  color:#fff;
  text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.4);
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion:no-preference){
  main > div{animation:rise .62s cubic-bezier(.2,.7,.3,1) backwards}
  main > div:nth-child(2){animation-delay:.05s}
  main > div:nth-child(3){animation-delay:.1s}
  main > div:nth-child(4){animation-delay:.15s}
  main > div:nth-child(5){animation-delay:.2s}
  main > div:nth-child(6){animation-delay:.25s}
  main > div:nth-child(7){animation-delay:.3s}
  main > div:nth-child(8){animation-delay:.35s}
  main > div:nth-child(n+9){animation-delay:.4s}
}

@keyframes rise{
  from{opacity:0;transform:translateY(20px)}
  to{opacity:1;transform:translateY(0)}
}

/* ---------- 断点 ---------- */
@media (min-width:640px){
  .shell{padding:0 24px}
  .foot{padding:44px 32px 24px}
  .foot-main{grid-template-columns:1.35fr 1fr;gap:32px}
  .foot-nav ul{grid-template-columns:1fr}
}

@media (min-width:901px){
  main{
    display:grid;
    grid-template-columns:236px minmax(0,1fr);
    gap:26px;
    align-items:start;
    padding:30px 0 72px;
  }

  main > div{grid-column:2;margin-bottom:0}

  .hero{grid-column:1 / -1;margin-top:6px}
  .rail{grid-column:1;grid-row:2 / span 40;align-self:stretch}
  .closer{grid-column:1 / -1;margin-top:2px}

  .foot-mark{font-size:clamp(2.4rem,7vw,4.6rem)}
}

@media (min-width:901px){
  .dock p{justify-content:center}
  .dock{overflow:visible}
}

@media (max-width:900px){
  .hero{min-height:62vh;padding:7vh 22px 9vh}
  .hero-plate{width:220px;height:220px;right:-60px;bottom:-70px}
  .rail-card{position:static;margin-bottom:20px;box-shadow:var(--e2)}
  .rail{margin-bottom:0}
  .closer{margin-top:4px}
}

@media (max-width:639px){
  .dock a{padding:10px 12px;font-size:15px}
  main > div{padding:22px 18px 30px}
  main > div::after{left:18px;right:18px}
  main > div h2{padding-left:11px}
  .foot-nav ul{grid-template-columns:1fr 1fr}
}

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

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