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

:root{
  --ink:#1f1f1f;
  --ink-2:#4b4b4b;
  --paper:#ffffff;
  --paper-2:#f5f5f5;
  --line:rgba(31,31,31,.10);
  --line-2:rgba(31,31,31,.18);
  --glass:rgba(255,255,255,.72);
  --glass-2:rgba(255,255,255,.55);
  --radius:18px;
  --e1:0 1px 2px rgba(31,31,31,.06),0 2px 6px rgba(31,31,31,.05);
  --e2:0 6px 16px rgba(31,31,31,.08),0 2px 5px rgba(31,31,31,.05);
  --e3:0 16px 34px rgba(31,31,31,.12),0 5px 12px rgba(31,31,31,.07);
  --e4:0 30px 64px rgba(31,31,31,.17),0 10px 22px rgba(31,31,31,.09);
  --head-h:64px;
}

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

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

body{
  margin:0;
  font-family:"Nunito","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.65;
  color:var(--ink);
  background-color:var(--paper-2);
  background-image:
    radial-gradient(760px 520px at 88% -8%, #ffffff 0%, rgba(255,255,255,0) 62%),
    radial-gradient(640px 460px at 4% 18%, #ffffff 0%, rgba(255,255,255,0) 58%),
    linear-gradient(180deg,#fbfbfb 0%,#f2f2f2 42%,#f7f7f7 100%);
  background-attachment:fixed;
  overflow-x:clip;
  z-index:0;
}

img{max-width:100%;height:auto;}
a{color:var(--ink);text-decoration:none;}
a:hover{text-decoration:underline;text-underline-offset:3px;}

h1,h2,h3,.brand,.menu a,.burger-txt{
  font-family:"Fredoka","Nunito","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-weight:600;
  letter-spacing:.01em;
}

:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------- 顶部条 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:40;
  display:grid;
  grid-template-columns:1fr auto 1fr auto;
  align-items:center;
  gap:10px;
  min-height:var(--head-h);
  padding:8px 16px;
  background:rgba(255,255,255,.76);
  -webkit-backdrop-filter:blur(16px) saturate(1.1);
  backdrop-filter:blur(16px) saturate(1.1);
  border-bottom:1px solid var(--line);
  box-shadow:var(--e1);
}

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

.rail-left{justify-self:start;}
.rail-right{justify-self:end;}

.topbar .rail a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 11px;
  border-radius:999px;
  font-size:16px;
  font-weight:500;
  color:var(--ink-2);
  transition:background .25s ease,color .25s ease,box-shadow .25s ease,transform .25s ease;
}

.topbar .rail a:hover{
  background:var(--paper);
  color:var(--ink);
  box-shadow:var(--e2);
  transform:translateY(-1px);
  text-decoration:none;
}

.brand{
  justify-self:center;
  padding:6px 14px;
  font-size:20px;
  letter-spacing:.04em;
  border-radius:999px;
  background:var(--paper);
  box-shadow:var(--e2);
  border:1px solid var(--line);
  white-space:nowrap;
}

.brand:hover{text-decoration:none;box-shadow:var(--e3);}

.burger{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--line-2);
  border-radius:999px;
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-size:16px;
  cursor:pointer;
  box-shadow:var(--e2);
  transition:box-shadow .25s ease,transform .25s ease;
}

.burger:hover{box-shadow:var(--e3);transform:translateY(-1px);}
.burger-lines{
  display:block;
  width:17px;
  height:2px;
  border-radius:2px;
  background:var(--ink);
  box-shadow:0 5px 0 var(--ink),0 -5px 0 var(--ink);
}

/* ---------- 全屏菜单 ---------- */
.menu{
  position:fixed;
  inset:0;
  z-index:60;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:22px;
  padding:70px 20px 40px;
  background:rgba(245,245,245,.84);
  -webkit-backdrop-filter:blur(20px);
  backdrop-filter:blur(20px);
  opacity:0;
  visibility:hidden;
  transform:translateY(-10px) scale(.985);
  transition:opacity .32s ease,transform .32s ease,visibility .32s;
}

.menu.is-open{opacity:1;visibility:visible;transform:none;}

.menu nav{width:100%;max-width:460px;}

.menu ul{
  display:grid;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  text-align:center;
}

.menu a{
  display:block;
  padding:13px 18px;
  min-height:48px;
  font-size:21px;
  border-radius:14px;
  background:var(--paper);
  border:1px solid var(--line);
  box-shadow:var(--e2);
}

.menu a:hover{
  text-decoration:none;
  box-shadow:var(--e4);
  transform:translateY(-2px);
}

.menu a{transition:box-shadow .25s ease,transform .25s ease;}

.menu-close{
  align-self:center;
  min-height:44px;
  padding:0 20px;
  border-radius:999px;
  border:1px solid var(--line-2);
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-size:16px;
  cursor:pointer;
  box-shadow:var(--e2);
}

body.menu-open{overflow:hidden;}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  align-items:center;
  gap:26px;
  min-height:45vh;
  max-width:1180px;
  margin:0 auto;
  padding:24px 20px 30px;
  overflow-x:clip;
}

.hero-art{
  position:relative;
  min-height:34vh;
  isolation:isolate;
}

.plate{
  position:absolute;
  margin:0;
  border-radius:var(--radius);
  overflow:hidden;
  background:linear-gradient(150deg,#efefef,#ffffff 60%,#e9e9e9);
  border:1px solid rgba(255,255,255,.85);
  box-shadow:var(--e4);
  transition:box-shadow .3s ease;
}

.plate img{display:block;width:100%;height:100%;object-fit:cover;}

.plate-1{
  left:0;
  top:2%;
  width:60%;
  aspect-ratio:3/4;
  z-index:2;
  transform:rotate(-4deg);
}

.plate-2{
  right:1%;
  bottom:0;
  width:55%;
  aspect-ratio:3/4;
  z-index:3;
  transform:rotate(3deg);
}

.hero-copy{
  position:relative;
  z-index:4;
  text-align:right;
}

.hero-copy h1{
  margin:0;
  font-size:clamp(28px,4.6vw,52px);
  line-height:1.18;
  letter-spacing:.005em;
  text-shadow:0 1px 0 #fff,0 14px 30px rgba(31,31,31,.14);
}

/* ---------- 主体 ---------- */
.main{
  position:relative;
  z-index:2;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px 44px;
}

.deck{
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:26px;
  align-items:start;
}

.side{
  position:sticky;
  top:calc(var(--head-h) + 14px);
  padding:18px 16px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--e3);
  z-index:3;
}

.side h2{
  margin:0 0 12px;
  font-size:18px;
}

.side h2 span{position:relative;display:inline-block;}
.side h2 span::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-5px;
  height:5px;
  border-radius:5px;
  background:linear-gradient(90deg,rgba(31,31,31,.22),rgba(31,31,31,.02));
}

.side ul{margin:14px 0 0;padding:0;list-style:none;display:grid;gap:4px;}

.side ul a{
  display:block;
  padding:9px 11px;
  min-height:40px;
  font-size:16px;
  color:var(--ink-2);
  border-radius:12px;
  transition:background .22s ease,color .22s ease,transform .22s ease;
}

.side ul a:hover{
  background:var(--paper);
  color:var(--ink);
  transform:translateX(2px);
  text-decoration:none;
  box-shadow:var(--e1);
}

.jump{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  margin-top:14px;
  padding:0 13px;
  font-size:16px;
  border-radius:999px;
  border:1px solid var(--line-2);
  background:var(--paper);
  box-shadow:var(--e1);
}

.jump:hover{text-decoration:none;box-shadow:var(--e2);}

/* ---------- 正文流 ---------- */
.stream{padding:0 6px;min-width:0;}

.stream > section{
  position:relative;
  margin:0 0 28px;
  padding:22px 22px 26px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--e2);
  z-index:2;
  transition:box-shadow .3s ease,transform .3s ease;
}

.stream > section:nth-child(3n+1){transform:translateX(-4px);box-shadow:var(--e3);z-index:3;}
.stream > section:nth-child(3n+2){transform:translateX(4px);}
.stream > section:nth-child(3n){transform:translateX(-2px);z-index:1;}

.stream > section:hover{box-shadow:var(--e4);}

.stream > section > figure{margin:16px 0;}

.stream h2{
  margin:0 0 14px;
  font-size:clamp(20px,2.3vw,26px);
  line-height:1.32;
}

.stream h2 span{position:relative;display:inline-block;}
.stream h2 span::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-5px;
  height:6px;
  border-radius:6px;
  background:linear-gradient(90deg,rgba(31,31,31,.16),rgba(31,31,31,.02));
}

.stream h3{
  margin:20px 0 10px;
  font-size:19px;
  line-height:1.4;
}

.stream h3 span{position:relative;display:inline-block;}

.stream p{margin:0 0 14px;}
.stream p:last-child{margin-bottom:0;}

.stream ul,.stream ol{margin:0 0 14px;padding-left:22px;}
.stream li{margin-bottom:6px;}

.stream a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
  text-decoration-color:rgba(31,31,31,.28);
}

.stream a:hover{text-decoration-color:var(--ink);}

.stream blockquote{
  margin:16px 0;
  padding:14px 16px;
  background:var(--paper);
  border-radius:14px;
  border-left:4px solid var(--ink);
  box-shadow:var(--e1);
}

.stream blockquote p:last-child{margin-bottom:0;}

.stream img{border-radius:14px;box-shadow:var(--e2);display:block;}

section[id]{scroll-margin-top:calc(var(--head-h) + 16px);}

/* ---------- 图集 ---------- */
.gallery{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:16px;
  margin-top:32px;
  padding:18px;
  background:var(--glass-2);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--e2);
}

.gallery figure{
  margin:0;
  border-radius:14px;
  overflow:hidden;
  background:var(--paper);
  box-shadow:var(--e2);
  transition:transform .3s ease,box-shadow .3s ease;
}

.gallery figure:hover{transform:translateY(-4px);box-shadow:var(--e4);}
.gallery img{display:block;width:100%;height:100%;object-fit:cover;}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  max-width:1180px;
  margin:0 auto;
  padding:20px 20px 34px;
  border-top:1px solid var(--line);
  color:var(--ink-2);
}

.foot p{margin:0;font-size:16px;}

.foot small{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:16px;
}

.foot small a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 10px;
  border-radius:999px;
  background:var(--paper);
  box-shadow:var(--e1);
}

.foot small a:hover{text-decoration:none;box-shadow:var(--e2);}
.foot small i{font-style:normal;opacity:.5;}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .rail-left,.rail-right{display:none;}
  .topbar{grid-template-columns:1fr auto 1fr;}
  .brand{grid-column:2;}
  .burger{grid-column:3;justify-self:end;}
}

@media (max-width:760px){
  body{font-size:16px;}
  .hero{
    grid-template-columns:1fr;
    gap:14px;
    min-height:0;
    padding:16px 16px 22px;
  }
  .hero-copy{order:-1;text-align:right;}
  .hero-art{min-height:260px;}
  .plate-1{width:56%;aspect-ratio:4/5;}
  .plate-2{width:52%;aspect-ratio:4/5;}
  .main{padding:0 14px 30px;}
  .deck{grid-template-columns:1fr;gap:16px;}
  .side{position:static;}
  .side ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;}
  .stream{padding:0;}
  .stream > section{padding:18px 16px 20px;margin-bottom:20px;transform:none!important;}
  .gallery{grid-template-columns:repeat(2,minmax(0,1fr));padding:12px;gap:10px;}
  .brand{font-size:18px;padding:6px 12px;}
  .foot{padding:18px 16px 30px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{transition:none!important;animation:none!important;}
  .plate,.stream > section{transform:none!important;}
}

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