/* ===== 01 变量与基础 ===== */
:root{
  --snow:#F6F8FA;
  --frost:#E4ECF2;
  --ink:#22323A;
  --pine:#0F2E33;
  --moss:#2E5A45;
  --ice:#5FC6E8;
  --ice-deep:#1A6076;
  --ember:#FF7A34;
  --ember-deep:#9A3707;
  --gold:#F2B23E;
  --clay:#A2583C;
  --stone:#7C8B94;
  --line:#C7D3DA;
  --white:#FFFFFF;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","DIN Alternate",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1240px;
  --header-h:84px;
  --ease:cubic-bezier(.2,.8,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background:var(--snow);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
:focus-visible{outline:2px solid var(--ice);outline-offset:2px;border-radius:2px}
::selection{background:var(--ice);color:var(--pine)}

/* ===== 02 中文排版与工具类 ===== */
.shell{width:min(var(--shell),100% - 48px);margin-inline:auto}
.display{font-weight:900;letter-spacing:-.02em;line-height:1.05}
.slant{display:inline-block;transform:skewX(-6deg)}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--stone);text-transform:uppercase}
.index-num{font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;color:var(--stone)}
.lead{font-size:clamp(17px,1.4vw,19px);line-height:1.8;color:#3B4E57}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.muted{color:var(--stone)}
.hl{background:linear-gradient(transparent 60%,rgba(95,198,232,.45) 60%);padding-inline:2px}
.rule{border:0;border-top:1px solid var(--line);margin:0}
.stack>*+*{margin-top:16px}
.stack-sm>*+*{margin-top:8px}
.stack-lg>*+*{margin-top:28px}
.cluster{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.container-note{font-size:13px;color:var(--stone);line-height:1.7}

/* ===== 03 跳转链接 ===== */
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:120;
  display:inline-block;padding:10px 20px;
  background:var(--pine);color:var(--snow);
  font-size:13px;letter-spacing:.08em;
  clip-path:polygon(10px 0,100% 0,100% 100%,10px 100%,0 calc(100% - 10px),0 10px);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:12px}

/* ===== 04 头部 ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  background-color:var(--snow);
  background-image:
    linear-gradient(112deg,rgba(95,198,232,.16) 0 16%,rgba(95,198,232,0) 16.2%),
    linear-gradient(248deg,rgba(255,122,52,.16) 0 10%,rgba(255,122,52,0) 10.2%);
  border-bottom:1px solid var(--line);
  transition:box-shadow .28s var(--ease);
}
.site-header[data-stuck]{box-shadow:0 10px 26px -22px rgba(15,46,51,.7)}
.header-inner{
  position:relative;z-index:3;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  min-height:var(--header-h);
  transition:min-height .28s var(--ease);
}
.site-header[data-stuck] .header-inner{min-height:56px}
.site-header[data-stuck] .brand-name{font-size:18px}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  pointer-events:none;
}
.scroll-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--ice),var(--ember));
  transition:width .12s linear;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{display:grid;grid-auto-flow:column;gap:3px;align-items:end;height:30px}
.brand-mark i{display:block;width:6px;transform:skewX(-14deg)}
.brand-mark i:nth-child(1){height:58%;background:var(--ember)}
.brand-mark i:nth-child(2){height:80%;background:var(--ice)}
.brand-mark i:nth-child(3){height:100%;background:var(--pine)}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{
  display:inline-block;font-size:21px;font-weight:900;letter-spacing:-.01em;
  transform:skewX(-6deg);transform-origin:left center;
  transition:font-size .28s var(--ease);
}
.brand-city{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--stone)}
.primary-nav{display:flex;align-items:center;gap:clamp(16px,2.4vw,34px)}
.nav-list{display:flex;align-items:center;gap:clamp(12px,1.6vw,24px)}
.nav-link{
  position:relative;display:inline-block;padding:6px 2px;
  font-size:14px;letter-spacing:.04em;color:#3B4E57;
  transition:color .22s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--ice);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--ink)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--ember)}
.nav-item--feature .nav-link{
  padding:8px 14px;
  background:var(--moss);color:var(--snow);
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:background .22s var(--ease),color .22s var(--ease);
}
.nav-item--feature .nav-link::after{display:none}
.nav-item--feature .nav-link:hover{background:#376B52}
.nav-item--feature .nav-link[aria-current="page"]{background:var(--ember);color:var(--pine)}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;position:relative;z-index:4;align-items:center;gap:10px;
  padding:8px 12px;border:1px solid var(--line);
  cursor:pointer;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:border-color .22s var(--ease);
}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars i{display:block;height:2px;background:var(--ink);transition:transform .26s var(--ease),opacity .2s linear,background .2s linear}
.nav-toggle-text{font-size:12px;letter-spacing:.14em}
.site-header[data-open] .nav-toggle{border-color:rgba(95,198,232,.55)}
.site-header[data-open] .nav-toggle-bars i{background:var(--ice)}
.site-header[data-open] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ===== 05 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;font-size:13px;letter-spacing:.1em;line-height:1;
  border:1px solid transparent;cursor:pointer;text-align:center;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--ice)}
.btn:hover{transform:translateY(-1px)}
.btn-solid{background:var(--pine);color:var(--snow)}
.btn-solid:hover{background:#164049}
.btn-ember{background:var(--ember);color:#12262B}
.btn-ember:hover{background:#FF8C4F}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ice);color:var(--pine)}
.btn-ice{background:var(--ice);color:var(--pine)}
.btn-moss{background:var(--moss);color:var(--snow)}
.btn-block{display:flex;width:100%}

/* ===== 06 区块 / 网格 / 正文 ===== */
.section{padding-block:clamp(48px,7vw,104px)}
.section--frost{background:var(--frost)}
.section--pine{background:var(--pine);color:#D7E3E8}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px 20px;margin-bottom:clamp(20px,3vw,36px)}
.section-title{font-size:clamp(26px,3.2vw,40px);font-weight:900;letter-spacing:-.015em;line-height:1.15}
.grid{display:grid;gap:clamp(18px,2.6vw,34px)}
.grid-5-7{grid-template-columns:5fr 7fr}
.grid-4-8{grid-template-columns:4fr 8fr}
.grid-3-6-3{grid-template-columns:3fr 6fr 3fr}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.prose{max-width:72ch}
.prose>p+p{margin-top:1.15em}
.prose h2{font-size:clamp(24px,2.6vw,32px);font-weight:800;line-height:1.25;letter-spacing:-.01em;margin:2.2em 0 .6em}
.prose h3{font-size:20px;font-weight:700;margin:1.8em 0 .5em}
.prose ul,.prose ol{margin:1em 0;padding-left:1.3em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.5em}
.prose strong{font-weight:700}
.prose a{color:var(--ice-deep);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--ember-deep)}
.breadcrumb{padding-top:20px;font-size:13px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--stone)}
.breadcrumb-list li{display:flex;align-items:center;gap:8px}
.breadcrumb-list li+li::before{content:"/";font-family:var(--font-mono);color:var(--line)}
.breadcrumb-list a{color:var(--stone);transition:color .2s var(--ease)}
.breadcrumb-list a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.breadcrumb-list [aria-current="page"]{color:var(--ink);font-weight:500}

/* ===== 07 卡片 / 标签 / 索引行 ===== */
.card{
  position:relative;padding:clamp(18px,2.2vw,26px);
  background:var(--white);border:1px solid var(--line);
  clip-path:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.card:hover{border-color:var(--ice);transform:translateY(-2px)}
.card.is-open{border-color:var(--ember)}
.card.is-open::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--ember)}
.card--moss{background:var(--moss);border-color:transparent;color:#EAF3EE}
.card--pine{background:var(--pine);border-color:transparent;color:#D7E3E8}
.card-eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--stone)}
.card--moss .card-eyebrow,.card--pine .card-eyebrow{color:var(--ice)}
.card-title{font-size:20px;font-weight:800;line-height:1.32;letter-spacing:-.01em}
.card-meta{font-size:13px;color:var(--stone)}
.card--moss .card-meta,.card--pine .card-meta{color:#A9C2C9}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;font-size:12px;letter-spacing:.1em;line-height:1.5;
  border:1px solid currentColor;white-space:nowrap;
}
.tag-ice{color:var(--ice-deep);background:rgba(95,198,232,.16);border-color:rgba(95,198,232,.55)}
.tag-ember{color:var(--ember-deep);background:rgba(255,122,52,.14);border-color:rgba(255,122,52,.5)}
.tag-moss{color:#24513D;background:rgba(46,90,69,.12);border-color:rgba(46,90,69,.4)}
.tag-clay{color:#7F432D;background:rgba(162,88,60,.12);border-color:rgba(162,88,60,.4)}
.tag-gold{color:#6B4A05;background:rgba(242,178,62,.22);border-color:rgba(242,178,62,.6)}
.tag-dark{color:#BFE6F5;background:rgba(95,198,232,.12);border-color:rgba(95,198,232,.42)}
.tag-ember-dark{color:#FFC7A6;background:rgba(255,122,52,.14);border-color:rgba(255,122,52,.45)}
.data-list{display:grid;border-top:1px solid var(--line)}
.data-row{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 18px;
  padding:16px 4px;border-bottom:1px solid var(--line);
  transition:background .2s var(--ease);
}
.data-row:hover{background:var(--frost)}
.data-time{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--ice-deep);min-width:76px}
.data-title{font-size:17px;font-weight:600}
.data-note{font-size:13px;color:var(--stone);margin-left:auto}

/* ===== 08 图片容器基础规则 ===== */
.frame{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  background:var(--frost);
}
.frame>img{width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .6s var(--ease)}
.frame:hover>img{transform:scale(1.03)}
.frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(150deg,rgba(15,46,51,.30),rgba(15,46,51,0) 54%,rgba(255,122,52,.18));
}
.frame-16x9{aspect-ratio:16/9}
.frame-21x9{aspect-ratio:21/9}
.frame-3x2{aspect-ratio:3/2}
.frame-4x5{aspect-ratio:4/5}
.frame-1x1{aspect-ratio:1/1}
.frame--cut{clip-path:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px)}
.frame--pending{
  display:grid;place-items:center;
  background-color:var(--frost);
  background-image:repeating-linear-gradient(135deg,rgba(124,139,148,.16) 0 10px,rgba(255,255,255,0) 10px 22px);
}
.frame--pending::before{
  content:attr(data-label);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--stone);
}
.frame-caption{
  position:absolute;left:0;bottom:0;z-index:2;max-width:82%;
  padding:10px 16px;background:rgba(15,46,51,.84);
  color:#DCE7EB;font-size:12px;letter-spacing:.1em;
}

/* ===== 09 页脚 ===== */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--pine);color:#CBD9DE;font-size:15px;
}
.site-footer::before{
  content:"";position:absolute;top:-140px;left:-15%;width:80%;height:320px;
  background:linear-gradient(112deg,rgba(95,198,232,.22),rgba(95,198,232,0) 68%);
  transform:rotate(-5deg);pointer-events:none;
}
.site-footer::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,rgba(95,198,232,0),rgba(95,198,232,.5),rgba(255,122,52,.45),rgba(95,198,232,0));
}
.foot-top{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.9fr);
  gap:clamp(28px,4vw,64px);
  padding:clamp(48px,7vw,88px) 0 clamp(32px,4vw,52px);
}
.foot-brand{min-width:0}
.foot-kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--ice);text-transform:uppercase}
.foot-wordmark{
  margin-top:14px;font-size:clamp(30px,3.6vw,44px);font-weight:900;
  line-height:1.1;letter-spacing:-.02em;color:var(--snow);
}
.foot-line{margin-top:12px;max-width:26ch;color:#9FB6BE;font-size:15px}
.foot-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.foot-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.foot-col{min-width:0}
.foot-col-title{
  margin-bottom:16px;padding-bottom:10px;
  font-size:13px;font-weight:500;letter-spacing:.14em;color:var(--ice);
  border-bottom:1px solid rgba(199,211,218,.18);
}
.foot-links li+li{margin-top:10px}
.foot-links a{position:relative;display:inline-block;color:#C4D4DA;font-size:15px;transition:color .22s var(--ease)}
.foot-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;
  background:var(--ember);transform:scaleX(0);transform-origin:left;
  transition:transform .26s var(--ease);
}
.foot-links a:hover{color:var(--white)}
.foot-links a:hover::after,.foot-links a:focus-visible::after{transform:scaleX(1)}
.foot-contact{
  position:relative;display:grid;gap:14px;
  margin-bottom:clamp(28px,4vw,48px);
  padding:clamp(22px,3vw,32px) clamp(22px,3vw,34px) clamp(22px,3vw,32px) clamp(28px,3.4vw,44px);
  background:linear-gradient(118deg,rgba(46,90,69,.62),rgba(46,90,69,.12));
  clip-path:polygon(16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%,0 16px);
}
.foot-contact::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--ice),var(--ember))}
.foot-contact-title{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--ice)}
.foot-contact-list{display:grid;gap:10px}
.foot-contact-list li{display:flex;flex-wrap:wrap;gap:12px;align-items:baseline}
.foot-key{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:#8FC7DA;min-width:48px}
.foot-val{color:#DCE7EB;font-size:15px}
.foot-note{color:#9FB6BE;font-size:13px;line-height:1.7;max-width:70ch}
.foot-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding:22px 0 28px;border-top:1px solid rgba(199,211,218,.18);
  font-size:13px;color:#8FA6AF;
}
.foot-legal{font-family:var(--font-mono);letter-spacing:.06em}
.foot-signoff{letter-spacing:.1em}

/* ===== 10 动效 ===== */
.has-js .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.has-js .reveal.is-visible{opacity:1;transform:none}

/* ===== 11 响应式 ===== */
@media (max-width:1100px){
  .primary-nav{gap:16px}
  .nav-list{gap:10px}
  .nav-link{font-size:13px}
}
@media (max-width:920px){
  .shell{width:min(var(--shell),100% - 32px)}
  .nav-toggle{display:inline-flex}
  .site-header::before{
    content:"";position:fixed;inset:0;z-index:2;
    background:rgba(15,46,51,.6);opacity:0;pointer-events:none;
    transition:opacity .3s var(--ease);
  }
  .site-header[data-open]::before{opacity:1;pointer-events:auto}
  .primary-nav{
    position:fixed;top:0;right:0;z-index:3;
    width:min(86vw,360px);height:100vh;height:100dvh;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    padding:96px 26px 40px;
    background:var(--pine);color:var(--snow);
    overflow-y:auto;visibility:hidden;
    transform:translateX(102%);
    transition:transform .36s var(--ease),visibility .36s linear;
    clip-path:polygon(26px 0,100% 0,100% 100%,0 100%,0 26px);
  }
  .site-header[data-open] .primary-nav{transform:translateX(0);visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{border-bottom:1px solid rgba(199,211,218,.16)}
  .nav-link{display:block;padding:16px 2px;font-size:17px;color:#D7E3E8}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--ice)}
  .nav-item--feature{margin-top:14px;border-bottom:0}
  .nav-item--feature .nav-link{padding:14px 16px;font-size:17px}
  .nav-actions{flex-direction:column;gap:12px;margin-top:26px}
  .nav-actions .btn{width:100%;padding:14px 18px;font-size:14px}
  .nav-actions .btn-ghost{color:var(--snow);border-color:rgba(199,211,218,.35)}
  .grid-5-7,.grid-4-8,.grid-3-6-3,.grid-2{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr;gap:34px}
  .foot-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:16px}
  .brand-mark{height:26px}
  .brand-name{font-size:19px}
  .foot-cols{grid-template-columns:1fr;gap:26px}
  .foot-contact-list li{gap:6px}
  .data-note{margin-left:0;width:100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js .reveal{opacity:1 !important;transform:none !important}
  .frame:hover>img{transform:none}
  .btn:hover{transform:none}
  .card:hover{transform:none}
}