:root{
  --green:#0F6B5A;
  --green-deep:#0A4A40;
  --copper:#C08A4E;
  --copper-soft:#E8C9A0;
  --night:#0B1B2B;
  --night-deep:#07121C;
  --warm:#F7F3EA;
  --mist:#D9DED8;
  --ink:#101820;
  --cyan:#2FD4B0;
  --violet:#5B4BC4;
  --paper:#FFFFFF;
  --ink-soft:#3B474B;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-index:"Barlow Condensed","Inter Tight","Helvetica Neue",Arial,"PingFang SC",sans-serif;
  --shell:1200px;
  --pad:clamp(18px,4vw,40px);
  --line:1px solid var(--mist);
  --ease:cubic-bezier(.2,.6,.2,1);
  --shadow-pill:0 12px 34px -22px rgba(11,27,43,.55);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--warm);color:var(--ink);font-family:var(--font-body);font-size:17px;line-height:1.75;font-weight:400;-webkit-font-smoothing:antialiased}
:where(h1,h2,h3,h4,p,figure,blockquote,dl,dd){margin:0}
a{color:inherit}
img,svg{max-width:100%}
button{font:inherit}
::selection{background:var(--cyan);color:var(--night)}
:focus-visible{outline:2px solid var(--violet);outline-offset:3px}
.site-footer :focus-visible{outline-color:var(--cyan)}

/* ---------- 排版与容器 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.container--narrow{max-width:820px}
.prose{max-width:720px}
.prose p+p{margin-top:1em}
.grid12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,28px)}
.display{margin:0;font-size:clamp(38px,7.2vw,104px);font-weight:800;letter-spacing:-.03em;line-height:1.02;color:var(--ink)}
.display-accent{color:var(--green)}
.h-section{margin:0;font-size:clamp(24px,3.4vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1.15}
.lede{font-size:clamp(16px,1.6vw,19px);line-height:1.7;color:var(--ink-soft);max-width:46ch}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0;font-family:var(--font-index);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--green)}
.eyebrow::before{content:"";width:14px;height:1px;background:var(--copper)}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* ---------- 通用组件 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 20px;border:1px solid var(--green);border-radius:0;background:var(--green);color:var(--warm);font-size:14px;font-weight:600;letter-spacing:.02em;line-height:1.2;text-decoration:none;cursor:pointer;transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease)}
.btn::after{content:"→";font-size:13px;line-height:1;transition:transform .18s var(--ease)}
.btn:hover{background:var(--green-deep);border-color:var(--green-deep)}
.btn:hover::after{transform:translateX(3px)}
.btn--cta{padding:10px 16px;font-size:13px}
.btn--ghost{background:transparent;border-color:rgba(232,201,160,.65);color:var(--copper-soft)}
.btn--ghost:hover{background:var(--copper);border-color:var(--copper);color:var(--night)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border:1px solid rgba(16,24,32,.14);background:var(--copper-soft);color:var(--ink);font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase;line-height:1.5}
.tag--green{background:var(--green);border-color:var(--green);color:var(--warm)}

.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0;padding:0;list-style:none;font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#5B6B66}
.breadcrumb a{color:var(--green-deep);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .16s var(--ease),color .16s var(--ease)}
.breadcrumb a:hover{color:var(--green);border-bottom-color:var(--copper)}
.breadcrumb [aria-current="page"]{color:var(--ink)}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--mist)}

.status-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0;padding:10px 14px;border-left:3px solid var(--cyan);background:var(--night);color:var(--warm);font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase}
.status-dot{width:6px;height:6px;background:var(--cyan)}

.file-card{position:relative;display:flex;flex-direction:column;gap:10px;padding:clamp(16px,2vw,24px);background:var(--paper);border:1px solid var(--mist);border-top:2px solid var(--green);transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease)}
.file-card:hover{transform:translateY(-2px);border-top-color:var(--copper);box-shadow:0 16px 34px -26px rgba(11,27,43,.6)}
.file-num{font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--copper)}

.index-list{margin:0;padding:0;list-style:none;display:grid;border-top:var(--line)}
.index-list li{border-bottom:var(--line)}
.index-link{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;padding:13px 8px;border-left:2px solid transparent;color:var(--ink);font-size:15px;text-decoration:none;transition:background .16s var(--ease),border-color .16s var(--ease),padding-left .16s var(--ease),color .16s var(--ease)}
.index-link:hover{background:var(--paper);padding-left:14px}
.index-link[aria-current="true"]{background:var(--paper);border-left-color:var(--cyan);padding-left:14px;color:var(--green-deep)}
.index-num{font-family:var(--font-index);font-size:11px;letter-spacing:.16em;color:var(--copper)}

.stat{display:grid;gap:4px}
.stat-value{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:-.03em;line-height:1;font-variant-numeric:tabular-nums}
.stat-unit{font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--copper)}

.media{position:relative;display:block;overflow:hidden;background:var(--night);isolation:isolate}
.media > img,.media > picture > img{display:block;width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x5{aspect-ratio:4/5}
.media--3x4{aspect-ratio:3/4}
.media--1x1{aspect-ratio:1/1}
.media-veil{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(11,27,43,0) 32%,rgba(11,27,43,.72) 100%)}
.media-caption{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;color:var(--warm);font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase}

[data-reveal]{opacity:1;transform:none}
[data-js="on"] [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-js="on"] [data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 头部 ---------- */
.skip-link{position:fixed;left:12px;top:-72px;z-index:200;padding:10px 16px;background:var(--night);color:var(--warm);font-family:var(--font-index);font-size:12px;letter-spacing:.16em;text-transform:uppercase;text-decoration:none;transition:top .16s var(--ease)}
.skip-link:focus{top:12px}

.site-header{position:sticky;top:0;z-index:80;padding:14px var(--pad) 0;background:transparent}
.header-shell{width:100%;max-width:var(--shell);margin-inline:auto}

.pill{position:relative;display:flex;align-items:center;gap:clamp(8px,1.4vw,22px);padding:9px 10px 9px 14px;background:rgba(247,243,234,.94);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--mist);box-shadow:var(--shadow-pill);transition:padding .22s var(--ease),box-shadow .22s var(--ease),background .22s var(--ease)}
.site-header[data-scrolled="true"] .pill{padding:5px 8px 5px 12px;background:rgba(247,243,234,.98);box-shadow:0 18px 42px -26px rgba(11,27,43,.72)}

.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;text-decoration:none;color:var(--ink)}
.brand-mark{position:relative;display:grid;place-items:center;width:30px;height:30px;border:1px solid var(--copper);background:linear-gradient(135deg,var(--green) 0%,var(--green-deep) 100%);flex:0 0 auto}
.brand-mark::after{content:"";width:8px;height:8px;background:var(--cyan);box-shadow:0 0 0 3px rgba(47,212,176,.2)}
.brand-text{display:grid;gap:1px}
.brand-name{font-size:15px;font-weight:800;letter-spacing:-.01em;line-height:1.24}
.brand-tag{font-family:var(--font-index);font-size:10px;font-weight:500;letter-spacing:.18em;line-height:1.2;color:var(--copper);text-transform:uppercase}

.nav{margin-inline:auto}
.nav-list{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav-link{display:inline-flex;align-items:center;gap:6px;padding:8px 10px;border:1px solid transparent;color:var(--ink);font-size:13.5px;font-weight:500;letter-spacing:.01em;text-decoration:none;transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease)}
.nav-link::before{content:"";width:0;height:1px;background:var(--copper);transition:width .18s var(--ease)}
.nav-link:hover{color:var(--green-deep);background:var(--paper);border-color:var(--mist)}
.nav-link:hover::before{width:10px}
.nav-link[aria-current="page"]{background:var(--green);border-color:var(--green);color:var(--warm)}
.nav-link[aria-current="page"]::before{width:10px;background:var(--copper-soft)}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.nav-toggle{display:none;position:relative;width:40px;height:40px;padding:0;border:1px solid var(--green);background:var(--green);cursor:pointer;transition:background .18s var(--ease)}
.nav-toggle:hover{background:var(--green-deep)}
.nav-toggle-bar{position:absolute;left:50%;width:16px;height:1.5px;background:var(--warm);transform:translateX(-50%);transition:transform .2s var(--ease),opacity .16s var(--ease)}
.nav-toggle-bar:nth-child(1){top:15px}
.nav-toggle-bar:nth-child(2){top:20px}
.nav-toggle-bar:nth-child(3){top:25px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateX(-50%) translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateX(-50%) translateY(-5px) rotate(-45deg)}

.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;pointer-events:none}
.scroll-progress::after{content:"";display:block;height:100%;width:100%;transform:scaleX(var(--progress,0));transform-origin:0 50%;background:linear-gradient(90deg,var(--cyan) 0%,var(--green) 55%,var(--copper) 100%);transition:transform .1s linear}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;margin-top:clamp(56px,8vw,110px);background:var(--night);color:var(--warm)}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--green) 0%,var(--green) 42%,var(--copper) 42%,var(--copper) 68%,var(--cyan) 68%,var(--cyan) 100%)}
.footer-shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}

.footer-top{padding:clamp(44px,6vw,76px) 0 clamp(30px,4vw,52px)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(28px,4vw,48px)}
.footer-brand{display:grid;justify-items:start;gap:12px}
.footer-index{margin:0;font-family:var(--font-index);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--copper)}
.footer-brandname{margin:0;font-size:clamp(26px,4vw,40px);font-weight:800;letter-spacing:-.025em;line-height:1.1;color:var(--warm)}
.footer-summary{margin:0;max-width:34ch;font-size:14.5px;line-height:1.75;color:rgba(247,243,234,.72)}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.footer-col-title{display:flex;align-items:baseline;gap:8px;margin:0;padding-bottom:10px;border-bottom:1px solid rgba(247,243,234,.16);font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--warm)}
.footer-col-num{font-family:var(--font-index);font-size:10px;font-weight:500;letter-spacing:.16em;color:var(--copper)}
.footer-links{display:grid;gap:8px;margin:12px 0 0;padding:0;list-style:none}
.footer-links a{display:inline-block;font-size:14px;color:rgba(247,243,234,.72);text-decoration:none;border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.footer-links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.footer-mid{border-top:1px solid rgba(247,243,234,.12);border-bottom:1px solid rgba(247,243,234,.12);background:var(--green-deep)}
.footer-mid .footer-shell{display:grid;grid-template-columns:minmax(0,1fr);gap:clamp(18px,2.6vw,30px);padding-block:clamp(22px,3vw,34px)}
.footer-fact{display:grid;justify-items:start;gap:6px}
.footer-fact-label{margin:0;font-family:var(--font-index);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--copper-soft)}
.footer-fact-value{margin:0;font-size:14.5px;line-height:1.6;color:var(--warm);word-break:break-word}
.copy-chip{padding:5px 10px;border:1px solid rgba(232,201,160,.5);background:transparent;color:var(--copper-soft);font-family:var(--font-index);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;cursor:pointer;transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease)}
.copy-chip:hover{background:var(--copper);border-color:var(--copper);color:var(--night)}
.copy-chip[data-copied="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--night)}
.footer-note{grid-column:1 / -1;margin:0;padding-top:14px;border-top:1px solid rgba(247,243,234,.14);font-size:12.5px;line-height:1.7;color:rgba(247,243,234,.62)}

.footer-base{background:var(--night-deep);padding-block:16px}
.footer-base .footer-shell{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px}
.footer-icp{margin:0;font-family:var(--font-index);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:rgba(247,243,234,.6)}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px}
.footer-legal a{font-family:var(--font-index);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:rgba(247,243,234,.72);text-decoration:none;border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.footer-legal a:hover{color:var(--warm);border-bottom-color:var(--copper)}

.to-top{position:fixed;right:16px;bottom:16px;z-index:90;padding:10px 14px;border:1px solid var(--green);background:var(--green);color:var(--warm);font-family:var(--font-index);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease),background .18s var(--ease)}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--green-deep)}

/* ---------- 响应式 ---------- */
@media (min-width:820px){
  .footer-mid .footer-shell{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:900px){
  .footer-grid{grid-template-columns:minmax(0,4.2fr) minmax(0,7.8fr)}
}
@media (max-width:899px){
  .nav-toggle{display:block}
  .nav{position:absolute;left:0;right:0;top:calc(100% + 8px);margin:0;padding:6px;background:rgba(247,243,234,.99);border:1px solid var(--mist);box-shadow:0 26px 52px -32px rgba(11,27,43,.75);opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease)}
  .nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{display:flex;padding:13px 12px;border-bottom:1px solid var(--mist);border-left:2px solid transparent;font-size:15px}
  .nav-link::before{display:none}
  .nav-link:hover{padding-left:16px}
  .nav-link[aria-current="page"]{border-left-color:var(--copper-soft)}
  .nav-list li:last-child .nav-link{border-bottom:0}
}
@media (max-width:640px){
  body{font-size:16px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col:last-child{grid-column:1 / -1}
}
@media (max-width:520px){
  .brand-tag{display:none}
  .brand-mark{width:26px;height:26px}
  .brand-name{font-size:14px}
  .btn--cta{padding:9px 12px;font-size:12px;letter-spacing:0}
  .btn::after{display:none}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-col:last-child{grid-column:auto}
  .footer-base .footer-shell{flex-direction:column;align-items:flex-start}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-js="on"] [data-reveal]{opacity:1;transform:none}
  .file-card:hover{transform:none}
}