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

:root{
  --paper:#ffffff;
  --paper-2:#f5f5f5;
  --ink:#1f1f1f;
  --ink-70:rgba(31,31,31,.7);
  --ink-55:rgba(31,31,31,.55);
  --ink-40:rgba(31,31,31,.4);
  --line:rgba(31,31,31,.12);
  --glass:rgba(255,255,255,.62);
  --glass-2:rgba(255,255,255,.86);
  --radius:28px;
  --radius-lg:36px;
  --serif:"Cormorant","Songti SC","Noto Serif SC",serif;
  --sans:"Montserrat",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

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

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

body{
  margin:0;
  max-width:100%;
  overflow-x:clip;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  color:var(--ink);
  background-color:var(--paper-2);
  background-image:radial-gradient(rgba(31,31,31,.09) 1px,transparent 1px);
  background-size:24px 24px;
  background-attachment:fixed;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit}
p{margin:0 0 1em}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.26;margin:0 0 .55em;letter-spacing:.005em}
h1{font-size:clamp(30px,5.2vw,58px);line-height:1.14}
h2{font-size:clamp(24px,2.8vw,36px)}
h3{font-size:clamp(19px,2vw,24px)}
::selection{background:rgba(31,31,31,.9);color:#fff}

:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}

/* ---------- 顶部 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  align-items:center;
  gap:10px;
  min-width:0;
  min-height:64px;
  padding:8px clamp(14px,3vw,34px);
  background:rgba(255,255,255,.74);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  backdrop-filter:blur(20px) saturate(150%);
  border-bottom:1px solid var(--line);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  min-width:0;
  padding-right:6px;
  font-size:16px;
  font-weight:600;
  letter-spacing:.05em;
  text-decoration:none;
}
.brand-img{flex:0 0 auto;width:34px;height:34px;border-radius:50%;object-fit:cover}
.brand-txt{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.menu-btn{
  display:none;
  flex:0 0 auto;
  align-items:center;
  margin-left:auto;
  min-height:44px;
  padding:0 16px;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  background:var(--glass-2);
  border:1px solid var(--line);
  border-radius:999px;
  cursor:pointer;
}

.nav{
  display:flex;
  align-items:center;
  gap:2px;
  margin-left:auto;
  min-width:0;
}

.nav-a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 13px;
  font-size:16px;
  color:var(--ink-55);
  text-decoration:none;
  border-radius:999px;
  white-space:nowrap;
  transition:background .22s ease,color .22s ease;
}
.nav-a:hover,.nav-a:focus-visible{background:rgba(31,31,31,.06);color:var(--ink)}

.nav-group{position:relative}

.nav-trigger{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:0 13px;
  font:inherit;
  font-size:16px;
  color:var(--ink-55);
  background:none;
  border:1px solid transparent;
  border-radius:999px;
  cursor:pointer;
  transition:background .22s ease,color .22s ease;
}
.nav-trigger::after{
  content:"";
  width:6px;
  height:6px;
  border-right:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  transition:transform .25s ease;
}
.nav-group:hover .nav-trigger,.nav-group.open .nav-trigger{background:rgba(31,31,31,.06);color:var(--ink)}
.nav-group:hover .nav-trigger::after,.nav-group.open .nav-trigger::after{transform:rotate(225deg) translateY(-1px)}

.nav-drop{
  position:absolute;
  top:calc(100% + 8px);
  left:0;
  min-width:196px;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:10px;
  background:rgba(255,255,255,.94);
  -webkit-backdrop-filter:blur(22px);
  backdrop-filter:blur(22px);
  border:1px solid var(--line);
  border-radius:22px;
  box-shadow:0 22px 44px rgba(31,31,31,.14);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}
.nav-group:hover .nav-drop,
.nav-group:focus-within .nav-drop,
.nav-group.open .nav-drop{opacity:1;visibility:visible;transform:translateY(0)}
.nav-drop .nav-a{justify-content:flex-start;width:100%;border-radius:14px}

/* ---------- 主体 ---------- */
main{
  max-width:1240px;
  margin:0 auto;
  padding:clamp(14px,3vw,34px);
  min-width:0;
}

/* ---------- 首屏 ---------- */
.hero{
  display:grid;
  grid-template-columns:1.06fr .94fr;
  align-items:center;
  gap:clamp(18px,3vw,40px);
  min-height:70vh;
  min-width:0;
  padding:clamp(24px,4vw,58px);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  background-color:rgba(255,255,255,.72);
  background-image:radial-gradient(rgba(31,31,31,.1) 1px,transparent 1px);
  background-size:18px 18px;
  -webkit-backdrop-filter:blur(26px);
  backdrop-filter:blur(26px);
  box-shadow:0 12px 44px rgba(31,31,31,.07);
  overflow:hidden;
}

.hero-copy{min-width:0}
.hero-copy h1,.hero-copy .lede{overflow-wrap:break-word}

.kicker{
  margin:0 0 14px;
  font-size:16px;
  font-weight:500;
  letter-spacing:.28em;
  color:var(--ink-40);
  overflow-wrap:break-word;
}

.lede{
  max-width:44ch;
  font-size:17px;
  color:var(--ink-70);
}

.hero-cta{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  margin-top:6px;
  padding:0 24px;
  font-size:16px;
  letter-spacing:.08em;
  color:#fff;
  background:var(--ink);
  border-radius:999px;
  text-decoration:none;
  transition:transform .25s ease,box-shadow .25s ease;
}
.hero-cta:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(31,31,31,.24)}

.hero-art{
  position:relative;
  min-width:0;
  min-height:280px;
  aspect-ratio:4 / 3;
  border-radius:24px;
  overflow:hidden;
  background:linear-gradient(155deg,#ececec,#fafafa 62%,#e9e9e9);
  will-change:transform;
}

.hero-slide{
  position:absolute;
  inset:0;
  margin:0;
  opacity:0;
  transition:opacity .9s ease;
}
.hero-slide.on{opacity:1}
.hero-slide img,.slide-img{width:100%;height:100%;object-fit:cover}

/* ---------- 布局：左侧栏 + 正文 ---------- */
.bench{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  align-items:start;
  gap:clamp(16px,2.4vw,28px);
  margin-top:clamp(16px,2.4vw,28px);
  min-width:0;
}

.side{
  position:sticky;
  top:84px;
  min-width:0;
  max-width:100%;
  padding:20px 20px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  box-shadow:0 4px 6px rgba(0,0,0,.05);
}

.side-h{
  margin:0 0 10px;
  font-family:var(--sans);
  font-size:16px;
  font-weight:600;
  letter-spacing:.22em;
  color:var(--ink-40);
}

.side-list{list-style:none;margin:0;padding:0;min-width:0;max-width:100%}
.side-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0;
  font-size:16px;
  color:var(--ink-55);
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:color .2s ease,padding-left .2s ease;
}
.side-list a:hover{color:var(--ink);padding-left:6px}

/* ---------- 正文 ---------- */
.content-col{
  display:grid;
  gap:clamp(14px,2vw,22px);
  min-width:0;
}

.content-col > div{
  min-width:0;
  padding:clamp(22px,3.2vw,42px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--glass);
  -webkit-backdrop-filter:blur(20px);
  backdrop-filter:blur(20px);
  box-shadow:0 4px 6px rgba(0,0,0,.05);
  scroll-margin-top:96px;
  transition:transform .3s ease,box-shadow .3s ease;
}

.content-col > div:hover{
  transform:scale(1.01);
  box-shadow:0 20px 42px rgba(31,31,31,.1);
}

.content-col h2 > span,
.content-col h3 > span{
  display:inline-block;
  padding-bottom:6px;
  border-bottom:1px solid var(--line);
}

.content-col h2,.content-col h3{margin-top:.2em}
.content-col > div > :first-child{margin-top:0}
.content-col > div > :last-child{margin-bottom:0}
.content-col p,
.content-col li,
.content-col h2,
.content-col h3,
.content-col h4,
.content-col blockquote,
.content-col td,
.content-col th{overflow-wrap:break-word}
.content-col ul,.content-col ol{padding-left:1.25em}
.content-col li{margin-bottom:.5em}
.content-col a{
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:4px;
}
.content-col a:hover{text-decoration-thickness:2px}
.content-col img{border-radius:20px;margin:1em 0}
.content-col pre{
  max-width:100%;
  overflow-x:auto;
  padding:14px 16px;
  border-radius:16px;
  background:rgba(31,31,31,.05);
  font-size:16px;
}
.content-col table{
  display:block;
  width:100%;
  max-width:100%;
  overflow-x:auto;
  border-collapse:collapse;
}
.content-col blockquote{
  margin:1.2em 0;
  padding:4px 0 4px 18px;
  border-left:2px solid var(--ink-40);
  color:var(--ink-70);
}
.content-col time{font-size:16px;color:var(--ink-40);letter-spacing:.04em}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:clamp(26px,4vw,60px);
  padding:clamp(26px,4vw,60px) clamp(14px,3vw,40px) 22px;
  background:rgba(255,255,255,.76);
  -webkit-backdrop-filter:blur(22px);
  backdrop-filter:blur(22px);
  border-top:1px solid var(--line);
  min-width:0;
}

.foot-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);
  align-items:start;
  gap:clamp(20px,3vw,44px);
  max-width:1180px;
  margin:0 auto;
  min-width:0;
}

.foot-brand{min-width:0}

.foot-mark{
  display:block;
  max-width:100%;
  font-family:var(--serif);
  font-size:clamp(36px,9vw,112px);
  font-weight:600;
  line-height:.94;
  letter-spacing:-.015em;
  color:var(--ink);
  text-decoration:none;
  overflow-wrap:break-word;
}

.foot-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(10px,2vw,24px);
  min-width:0;
}

.foot-dl{margin:0;min-width:0}
.foot-dl dt h3{
  margin:0 0 6px;
  font-family:var(--sans);
  font-size:16px;
  font-weight:600;
  letter-spacing:.16em;
  color:var(--ink-40);
}
.foot-dl dt h3 span{display:inline-block}
.foot-dl dd{margin:0;min-width:0}
.foot-dl dd a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:2px 0;
  font-size:16px;
  color:var(--ink-55);
  text-decoration:none;
  overflow-wrap:break-word;
  transition:color .2s ease;
}
.foot-dl dd a:hover{color:var(--ink)}

.foot-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  max-width:1180px;
  margin:clamp(22px,3vw,38px) auto 0;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-size:16px;
  color:var(--ink-40);
}

.to-top{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  color:var(--ink);
  text-decoration:none;
  border:1px solid var(--line);
  border-radius:999px;
  transition:background .2s ease;
}
.to-top:hover{background:rgba(31,31,31,.06)}

/* ---------- 断点 ---------- */
@media (min-width:901px){
  .content-col > div:nth-child(odd){margin-right:38px}
  .content-col > div:nth-child(even){margin-left:38px}
}

@media (max-width:900px){
  .menu-btn{display:inline-flex;margin-left:auto}

  .nav{
    position:fixed;
    left:12px;
    right:12px;
    top:72px;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    margin:0;
    padding:12px;
    max-height:calc(100vh - 96px);
    overflow:auto;
    background:rgba(255,255,255,.97);
    border:1px solid var(--line);
    border-radius:24px;
    box-shadow:0 24px 50px rgba(31,31,31,.18);
  }
  .top.menu-open .nav{display:flex}

  .nav-a{justify-content:flex-start;width:100%;padding:0 14px;border-radius:14px}

  .nav-trigger{width:100%;justify-content:space-between;padding:0 14px;border-radius:14px}

  .nav-drop{
    position:static;
    min-width:0;
    display:none;
    opacity:1;
    visibility:visible;
    transform:none;
    padding:0 0 4px 10px;
    background:none;
    border:0;
    border-radius:0;
    box-shadow:none;
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
  }
  .nav-group.open .nav-drop{display:flex}

  .hero{grid-template-columns:minmax(0,1fr);min-height:0;padding:24px;border-radius:28px;gap:20px}
  .hero-art{aspect-ratio:16 / 10;min-height:0}
  .lede{max-width:none}
  .kicker{margin-bottom:10px;letter-spacing:.2em}

  .bench{grid-template-columns:minmax(0,1fr)}
  .side{position:static;padding:14px 16px}
  .side-h{margin-bottom:8px}
  .side-list{
    display:flex;
    gap:8px;
    max-width:100%;
    overflow-x:auto;
    padding-bottom:2px;
    scrollbar-width:thin;
    -webkit-overflow-scrolling:touch;
    overscroll-behavior-x:contain;
  }
  .side-list li{flex:0 0 auto}
  .side-list a{
    min-height:44px;
    padding:0 14px;
    border:1px solid var(--line);
    border-radius:999px;
    white-space:nowrap;
  }
  .side-list a:hover{padding-left:14px;background:rgba(31,31,31,.06)}

  .content-col > div{padding:22px;border-radius:24px}

  .foot-top{grid-template-columns:minmax(0,1fr)}
  .foot-nav{gap:10px}
  .foot-base{font-size:16px}
}

@media (max-width:420px){
  .brand-txt{max-width:42vw}
  .foot-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
  .foot-dl dd a{font-size:16px;line-height:1.4}
  .content-col > div{padding:18px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .content-col > div:hover{transform:none}
  .hero-art{transform:none !important}
}

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