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

:root{
  --ink:#1f1f1f;
  --paper:#ffffff;
  --mist:#f5f5f5;
  --line:rgba(31,31,31,.16);
  --mute:rgba(31,31,31,.62);
  --e1:0 1px 0 rgba(31,31,31,.07),0 3px 8px rgba(31,31,31,.06);
  --e2:0 2px 6px rgba(31,31,31,.08),0 10px 24px rgba(31,31,31,.1);
  --e3:0 8px 18px rgba(31,31,31,.1),0 22px 48px rgba(31,31,31,.14);
  --e4:0 16px 32px rgba(31,31,31,.14),0 40px 80px rgba(31,31,31,.18);
  --head-h:126px;
  --sans:"Manrope",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --display:"Syne","Manrope",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  overflow-x:hidden;
}
body.is-locked{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit}
button,input{font:inherit;color:inherit}
p{margin:0 0 16px}

/* ---------- 顶部：品牌独占一行 + 菜单行 ---------- */
.top{
  position:fixed;
  top:0;left:0;right:0;
  z-index:60;
  background:rgba(255,255,255,.86);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--ink);
  box-shadow:var(--e1);
}
.top-brand{padding:12px 20px 10px;border-bottom:1px solid var(--line)}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:40px;
  text-decoration:none;
  font-family:var(--display);
  font-weight:700;
  font-size:20px;
  letter-spacing:.01em;
  line-height:1.2;
}
.mark{width:34px;height:34px;object-fit:cover;border:1px solid var(--ink)}
.brand-word{border-bottom:1px solid transparent;transition:border-color .25s}
.brand:hover .brand-word{border-color:var(--ink)}

.top-bar{display:flex;align-items:center;gap:12px;padding:8px 20px}
.menu-btn{
  flex:none;
  min-height:42px;
  padding:0 18px;
  border:1px solid var(--ink);
  background:var(--ink);
  color:#fff;
  font-family:var(--display);
  font-weight:600;
  font-size:16px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
}
.menu-btn:hover{transform:translateY(-2px);box-shadow:var(--e2);background:#000}
.menu-btn:active{transform:translateY(0)}

.search{
  flex:1;
  min-width:0;
  display:flex;
  margin-left:auto;
  max-width:420px;
  border:1px solid var(--ink);
  background:#fff;
  box-shadow:var(--e1);
}
.search-input{
  flex:1;
  min-width:0;
  min-height:42px;
  border:0;
  background:transparent;
  padding:0 12px;
  font-size:16px;
}
.search-input:focus{outline:2px solid var(--ink);outline-offset:-3px}
.search-btn{
  flex:none;
  border:0;
  border-left:1px solid var(--ink);
  background:var(--mist);
  padding:0 14px;
  min-height:42px;
  font-size:16px;
  cursor:pointer;
  transition:background .2s ease,color .2s ease;
}
.search-btn:hover{background:var(--ink);color:#fff}

/* ---------- 全屏遮罩菜单（右侧推出） ---------- */
.scrim{
  position:fixed;
  inset:0;
  z-index:70;
  background:rgba(31,31,31,.42);
  -webkit-backdrop-filter:blur(3px);
  backdrop-filter:blur(3px);
  opacity:0;
  pointer-events:none;
  transition:opacity .35s ease;
}
.scrim.is-on{opacity:1;pointer-events:auto}

.panel{
  position:fixed;
  top:0;right:0;bottom:0;
  z-index:80;
  width:min(430px,100%);
  padding:26px 22px 44px;
  background:var(--paper);
  border-left:1px solid var(--ink);
  box-shadow:var(--e4);
  overflow-y:auto;
  transform:translateX(102%);
  transition:transform .45s cubic-bezier(.22,.72,.2,1);
}
.panel.is-open{transform:none}
.panel-close{
  position:absolute;
  top:18px;right:18px;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--ink);
  background:var(--mist);
  font-size:16px;
  cursor:pointer;
  transition:background .2s ease,color .2s ease;
}
.panel-close:hover{background:var(--ink);color:#fff}

.panel-nav{margin-top:56px}
.panel-nav ul{list-style:none;margin:0;padding:0}
.panel-nav li{border-top:1px solid var(--line);opacity:0}
.panel-nav li:last-child{border-bottom:1px solid var(--line)}
.panel-nav a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:6px;
  text-decoration:none;
  font-family:var(--display);
  font-size:19px;
  font-weight:600;
  letter-spacing:.01em;
  transition:padding-left .3s ease,background .3s ease,box-shadow .3s ease;
}
.panel-nav a:hover{background:var(--mist);padding-left:16px;box-shadow:inset 3px 0 0 var(--ink)}
.panel.is-open .panel-nav li{animation:rise .5s cubic-bezier(.22,.72,.2,1) both}
.panel-nav li:nth-child(1){animation-delay:.05s}
.panel-nav li:nth-child(2){animation-delay:.1s}
.panel-nav li:nth-child(3){animation-delay:.15s}
.panel-nav li:nth-child(4){animation-delay:.2s}
.panel-nav li:nth-child(5){animation-delay:.25s}
.panel-nav li:nth-child(6){animation-delay:.3s}
.panel-nav li:nth-child(7){animation-delay:.35s}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  padding:calc(var(--head-h) + 34px) 20px 84px;
  background:linear-gradient(158deg,#ffffff 0%,var(--mist) 52%,#e9e9e9 100%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 66px),0 100%);
}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{width:100%;height:100%;object-fit:cover;filter:grayscale(.14) contrast(1.06)}
.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(255,255,255,.78) 0%,rgba(255,255,255,.34) 46%,rgba(255,255,255,.92) 100%);
}
.hero-type{
  position:absolute;
  top:calc(var(--head-h) + 40px);
  left:-8px;right:0;
  z-index:1;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(54px,14vw,178px);
  line-height:.84;
  letter-spacing:-.05em;
  white-space:nowrap;
  color:transparent;
  -webkit-text-stroke:1.5px rgba(31,31,31,.32);
  pointer-events:none;
}
.hero-foot{position:relative;z-index:3;width:100%;max-width:1100px}
.hero-h1{
  margin:0;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(34px,7.2vw,86px);
  line-height:1.02;
  letter-spacing:-.03em;
  text-shadow:0 1px 0 #fff;
}

/* ---------- 正文层 ---------- */
.wrap{
  position:relative;
  z-index:5;
  width:min(1180px,100%);
  margin:-60px auto 0;
  padding:0 20px;
}
.shell{
  position:relative;
  isolation:isolate;
  background:var(--paper);
  border:1px solid var(--ink);
  box-shadow:var(--e3);
  padding:clamp(24px,4vw,52px);
}
.shell::before{
  content:"";
  position:absolute;
  inset:0;
  transform:translate(14px,14px);
  border:1px solid var(--line);
  z-index:-1;
  pointer-events:none;
}
.shell-title{
  margin:0 0 8px;
  font-family:var(--display);
  font-size:clamp(22px,3vw,32px);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.02em;
}
.subtitle{
  margin:0 0 30px;
  font-size:16px;
  letter-spacing:.16em;
  color:var(--mute);
}

.prose{font-size:17px}
.prose div{
  padding:30px 0;
  border-top:1px solid var(--line);
  scroll-margin-top:calc(var(--head-h) + 26px);
}
.prose div:first-child{border-top:0;padding-top:0}
.prose h2{
  margin:0 0 16px;
  font-family:var(--display);
  font-size:clamp(21px,2.6vw,30px);
  line-height:1.26;
  letter-spacing:-.02em;
}
.prose h3{margin:26px 0 10px;font-size:19px;line-height:1.4}
.prose p{max-width:72ch}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin:0 0 8px}
.prose li::marker{color:var(--ink)}
.prose a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
  transition:background .2s ease;
}
.prose a:hover{background:rgba(31,31,31,.09)}
.prose img{
  height:auto;
  margin:8px 0 20px;
  border:1px solid var(--ink);
  box-shadow:var(--e2);
}
.prose blockquote{
  margin:0 0 20px;
  padding:16px 20px;
  background:var(--mist);
  border-left:4px solid var(--ink);
  box-shadow:var(--e1);
}
.prose strong{font-weight:700}
.prose table{width:100%;border-collapse:collapse;margin:0 0 20px;font-size:16px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--mist)}
.prose code{font-size:15px;background:var(--mist);padding:1px 5px}

/* ---------- 页脚 ---------- */
footer{
  position:relative;
  z-index:4;
  margin-top:88px;
  padding:56px 20px 26px;
  background:var(--ink);
  color:#fff;
}
.foot-huge{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(36px,10.4vw,130px);
  line-height:.9;
  letter-spacing:-.05em;
  color:transparent;
  -webkit-text-stroke:1.5px rgba(255,255,255,.48);
  white-space:nowrap;
  overflow:hidden;
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:22px;
  margin:34px 0 0;
  padding:26px 0 0;
  border-top:1px solid rgba(255,255,255,.28);
}
.foot-cols dt{font-size:16px;letter-spacing:.18em;color:rgba(255,255,255,.66)}
.foot-cols dd{margin:10px 0 0;font-size:16px;line-height:1.55}
.foot-cols a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .2s ease;
}
.foot-cols a:hover{border-color:#fff}
.foot-base{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  margin-top:30px;
  padding-top:18px;
  border-top:1px solid rgba(255,255,255,.28);
  font-size:16px;
}
.foot-base p{margin:0}
.foot-base a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  text-decoration:none;
  border-bottom:1px solid rgba(255,255,255,.55);
  transition:border-color .2s ease,color .2s ease;
}
.foot-base a:hover{border-color:#fff}

/* ---------- 断点 ---------- */
@media (max-width:760px){
  :root{--head-h:118px}
  .top-brand{padding:10px 14px 8px}
  .top-bar{padding:8px 14px;gap:8px}
  .menu-btn{padding:0 14px;letter-spacing:.1em}
  .search-input{padding:0 10px}
  .search-btn{padding:0 10px}
  .hero{padding-top:calc(var(--head-h) + 26px);padding-bottom:66px;clip-path:polygon(0 0,100% 0,100% calc(100% - 40px),0 100%)}
  .hero-type{font-size:clamp(46px,15vw,120px)}
  .wrap{margin-top:-42px;padding:0 14px}
  .shell{padding:22px 16px}
  .shell::before{transform:translate(9px,9px)}
  .prose div{padding:24px 0}
  .foot-cols{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
  .panel{width:100%;border-left:0}
  footer{padding:44px 14px 22px}
  .foot-base{flex-wrap:wrap}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .panel-nav li{opacity:1}
  .panel.is-open .panel-nav li{opacity:1}
}

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