/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd,pre{margin:0}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
table{border-collapse:collapse;width:100%}

/* ===== 2. 变量 ===== */
:root{
  --ink:#0B3B3C;
  --ink-dark:#062A2B;
  --ink-mid:#11565A;
  --ink-soft:#1A6A63;
  --gold:#E0A83C;
  --gold-soft:#F6D98F;
  --gold-ink:#8A6212;
  --lime:#A9F04B;
  --lime-ink:#2F6B0E;
  --coral:#FF5A36;
  --coral-ink:#C03A17;
  --paper:#F4F1E8;
  --paper-2:#E9E5D9;
  --paper-3:#FBFAF4;
  --mist:#C3D4D2;
  --text:#08191A;
  --text-soft:#3C5453;
  --shell:min(1240px,92vw);
  --radius-xl:40px;
  --radius-lg:28px;
  --radius-md:18px;
  --radius-sm:12px;
  --shadow-panel:0 26px 60px -34px rgba(6,42,43,.5);
  --ease:cubic-bezier(.22,1,.36,1);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;
}

/* ===== 3. 基础排版 ===== */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
@media (min-width:1024px){body{font-size:17px;line-height:1.75}}
body.nav-open{overflow:hidden}
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.18;color:var(--ink)}
h1{font-size:clamp(30px,5.4vw,54px);font-weight:900}
h2{font-size:clamp(24px,3.6vw,38px)}
h3{font-size:clamp(19px,2.2vw,24px)}
::selection{background:var(--gold);color:var(--ink-dark)}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:4px}
.site-header :focus-visible,.site-footer :focus-visible,
.panel--ink :focus-visible,.panel--mid :focus-visible,
.brand-bar :focus-visible{outline-color:var(--gold-soft)}
.u-visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ===== 4. 布局辅助 ===== */
.container{width:var(--shell);margin-inline:auto}
.container--narrow{width:min(880px,92vw);margin-inline:auto}
.section{padding-block:clamp(52px,7vw,104px);position:relative}
.section--tight{padding-block:clamp(30px,4vw,56px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.2vw,28px)}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

/* ===== 5. 按钮 / 徽章 / 标签 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;
  font-size:14.5px;font-weight:800;letter-spacing:.02em;line-height:1;
  transition:transform .22s var(--ease),background-color .22s var(--ease),
             color .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--gold{background:linear-gradient(135deg,var(--gold),#F0C163);color:#3A2606}
.btn--gold:hover{background:linear-gradient(135deg,var(--gold-soft),var(--gold))}
.btn--ghost{border-color:rgba(246,217,143,.5);color:var(--gold-soft)}
.btn--ghost:hover{background:rgba(246,217,143,.14)}
.btn--lime{background:var(--lime);color:#16300A}
.btn--lime:hover{background:#BCF76B}
.btn--ink{background:var(--ink);color:var(--paper)}
.btn--ink:hover{background:var(--ink-mid)}
.btn--sm{padding:9px 16px;font-size:13px}

.badge{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 12px;border-radius:999px;
  font-size:11.5px;font-weight:700;letter-spacing:.14em;white-space:nowrap;
}
.badge::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;opacity:.9}
.badge--gold{color:var(--gold-soft);border:1px solid rgba(224,168,60,.5);background:rgba(224,168,60,.12)}
.badge--lime{color:var(--lime);border:1px solid rgba(169,240,75,.45);background:rgba(169,240,75,.1)}
.badge--coral{color:var(--coral);border:1px solid rgba(255,90,54,.45);background:rgba(255,90,54,.1)}

.label{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--text-soft)}
.label--gold{color:var(--gold-ink)}
.section-label{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:800;letter-spacing:.16em;color:var(--gold-ink);
}
.section-label::before{content:"";width:22px;height:2px;border-radius:2px;background:var(--lime-ink)}
.panel--ink .section-label,.panel--mid .section-label{color:var(--gold-soft)}
.panel--ink .section-label::before,.panel--mid .section-label::before{background:var(--lime)}

/* ===== 6. Skip link ===== */
.skip-link{
  position:fixed;left:50%;top:10px;z-index:300;
  transform:translate(-50%,-180%);
  background:var(--gold);color:var(--ink-dark);
  font-size:14px;font-weight:800;padding:10px 22px;border-radius:999px;
  box-shadow:0 14px 30px rgba(6,42,43,.4);
  transition:transform .24s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ===== 7. 头部 ===== */
.site-header{position:relative;z-index:60;font-size:16px;line-height:1.5}

.brand-bar{background:var(--ink-dark);color:var(--paper);border-bottom:1px solid rgba(224,168,60,.22)}
.brand-bar__inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:9px;min-height:50px}
.brand-signature{display:flex;align-items:center;gap:12px;flex-wrap:wrap;min-width:0}
.brand-signature__mark{font-size:14px;font-weight:900;letter-spacing:.04em;color:var(--gold-soft);white-space:nowrap}
.brand-signature__mark::after{
  content:"";display:inline-block;width:6px;height:6px;margin-left:10px;
  border-radius:2px;background:var(--lime);vertical-align:2px;
}
.brand-signature__text{font-size:12.5px;color:rgba(244,241,232,.68);letter-spacing:.02em}
.brand-bar__meta{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.brand-bar__actions{display:flex;align-items:center;gap:10px}

.nav-row{
  position:relative;
  background:linear-gradient(110deg,#0B3B3C 0%,#11565A 52%,#0B3B3C 100%);
  border-bottom:1px solid rgba(195,212,210,.16);
}
.nav-row::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(90deg,rgba(244,241,232,.055) 1px,transparent 1px);
  background-size:64px 100%;
}
.nav-row__inner{position:relative;display:flex;align-items:center;gap:20px;min-height:66px}

.nav-brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;padding-block:10px}
.nav-brand__glyph{width:28px;height:28px;border-radius:10px 3px 10px 3px;background:linear-gradient(135deg,var(--lime),var(--gold));box-shadow:inset 0 0 0 1px rgba(6,42,43,.25)}
.nav-brand__name{font-size:19px;font-weight:900;letter-spacing:-.01em;color:var(--paper)}

.primary-nav{margin-left:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:inline-block;padding:11px 15px;border-radius:999px;
  font-size:15px;font-weight:600;color:rgba(244,241,232,.76);
  transition:color .22s var(--ease),background-color .22s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(244,241,232,.09)}
.nav-link[aria-current="page"]{color:var(--gold-soft);font-weight:800}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:15px;right:15px;bottom:3px;height:2px;
  border-radius:2px;background:var(--lime);
}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:10px 14px;border-radius:14px;
  border:1px solid rgba(246,217,143,.42);color:var(--gold-soft);
  font-size:13px;font-weight:800;letter-spacing:.1em;
  position:relative;z-index:80;
}
.nav-toggle__bars{position:relative;display:inline-block;width:16px;height:11px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:transform .3s var(--ease),top .3s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:9px}
.nav-row[data-open] .nav-toggle__bars::before{top:4.5px;transform:rotate(45deg)}
.nav-row[data-open] .nav-toggle__bars::after{top:4.5px;transform:rotate(-45deg)}

/* ===== 8. 页脚 ===== */
.site-footer{
  position:relative;background:var(--ink-dark);color:var(--paper);
  border-top:1px solid rgba(224,168,60,.28);margin-top:auto;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    radial-gradient(circle at 10% 0%,rgba(224,168,60,.15),transparent 42%),
    radial-gradient(circle at 90% 100%,rgba(169,240,75,.09),transparent 46%);
}
.footer-gridwrap{
  position:relative;display:grid;
  grid-template-columns:minmax(230px,1.05fr) minmax(0,3fr);
  gap:clamp(30px,4.5vw,72px);
  padding-block:clamp(46px,6.5vw,86px);
}
.footer-brand__top{display:flex;align-items:center;gap:11px}
.footer-brand__glyph{width:32px;height:32px;border-radius:11px 3px 11px 3px;background:linear-gradient(135deg,var(--lime),var(--gold));box-shadow:inset 0 0 0 1px rgba(6,42,43,.25)}
.footer-brand__name{font-size:21px;font-weight:900;letter-spacing:-.01em;color:var(--paper)}
.footer-brand__sig{margin-top:14px;font-size:13.5px;line-height:1.75;color:rgba(195,212,210,.86);max-width:26ch}
.footer-brand__cta{margin-top:20px}
.footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(20px,2.6vw,32px)}
.footer-col__title{font-size:11.5px;font-weight:800;letter-spacing:.16em;color:var(--gold-soft);margin-bottom:14px}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{display:inline-block;font-size:14.5px;color:rgba(244,241,232,.74);transition:color .2s var(--ease),padding-left .2s var(--ease)}
.footer-links a:hover{color:var(--lime);padding-left:4px}
.footer-note{margin-top:16px;font-size:12.5px;letter-spacing:.03em;color:rgba(169,240,75,.82)}
.footer-base{position:relative;background:rgba(0,0,0,.26);border-top:1px solid rgba(195,212,210,.12)}
.footer-base__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 26px;padding-block:18px;font-size:12.5px;color:rgba(195,212,210,.76);
}
.footer-base__inner p{max-width:none}
.footer-legal{font-family:var(--font-mono);letter-spacing:.04em;color:rgba(246,217,143,.86)}
.footer-copy{white-space:nowrap}

/* ===== 9. 面包屑 ===== */
.breadcrumb{padding-block:16px;font-size:13px;color:var(--text-soft)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"";display:inline-block;width:5px;height:5px;border-radius:1px;background:var(--mist)}
.breadcrumb a{color:var(--ink-mid);font-weight:700}
.breadcrumb a:hover{color:var(--gold-ink);text-decoration:underline}
.breadcrumb [aria-current="page"]{font-weight:700;color:var(--text-soft)}

/* ===== 10. 面板 / 正文 / 数据 ===== */
.panel{
  background:var(--paper-3);border-radius:var(--radius-lg);
  padding:clamp(22px,3vw,40px);box-shadow:var(--shadow-panel);
}
.panel--flat{background:var(--paper-2);box-shadow:none}
.panel--ink{background:linear-gradient(150deg,#0B3B3C,#11565A 60%,#0B3B3C);color:var(--paper);box-shadow:none}
.panel--mid{background:var(--ink-mid);color:var(--paper);box-shadow:none}
.panel--gold{background:linear-gradient(140deg,#F6D98F,#E0A83C);color:#3A2606;box-shadow:none}
.panel--ink h1,.panel--ink h2,.panel--ink h3,.panel--mid h1,.panel--mid h2,.panel--mid h3{color:var(--paper)}
.panel--gold h1,.panel--gold h2,.panel--gold h3{color:#3A2606}

.prose{max-width:66ch}
.prose p{font-size:16px;line-height:1.8;color:var(--text-soft)}
@media (min-width:1024px){.prose p{font-size:17px;line-height:1.75}}
.prose p+p{margin-top:1.05em}
.prose h2{margin-top:1.9em;margin-bottom:.6em;font-size:clamp(23px,3vw,32px)}
.prose h3{margin-top:1.5em;margin-bottom:.5em;font-size:clamp(18px,2.2px + 1.4vw,22px)}
.prose ul{margin-top:1em}
.prose li{position:relative;padding-left:22px;margin-top:.45em;color:var(--text-soft);line-height:1.75}
.prose li::before{content:"";position:absolute;left:4px;top:.72em;width:8px;height:8px;border-radius:3px 1px 3px 1px;background:var(--gold)}
.prose strong{color:var(--ink);font-weight:800}
.prose a{color:var(--ink-mid);text-decoration:underline;text-decoration-color:var(--gold);text-underline-offset:3px}
.prose a:hover{color:var(--gold-ink)}
.panel--ink .prose p,.panel--ink .prose li,.panel--mid .prose p,.panel--mid .prose li{color:rgba(244,241,232,.84)}
.panel--ink .prose strong,.panel--mid .prose strong{color:var(--gold-soft)}

.data-num{
  font-family:var(--font-mono);font-weight:700;letter-spacing:.02em;
  font-variant-numeric:tabular-nums;line-height:1.05;
  font-size:clamp(1.7rem,3.6vw,2.6rem);color:var(--ink);
}
.data-num--lime{color:var(--lime-ink)}
.data-num--coral{color:var(--coral-ink)}
.data-num--gold{color:var(--gold-ink)}
.panel--ink .data-num,.panel--mid .data-num{color:var(--gold-soft)}
.panel--ink .data-num--lime,.panel--mid .data-num--lime{color:var(--lime)}
.panel--ink .data-num--coral,.panel--mid .data-num--coral{color:var(--coral)}

/* ===== 11. 图片容器 ===== */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border-radius:var(--radius-lg);
  background:linear-gradient(150deg,#0B3B3C,#11565A 60%,#1C6E63);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(244,241,232,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(244,241,232,.07) 1px,transparent 1px);
  background-size:38px 38px;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:16px 20px;font-size:12.5px;letter-spacing:.06em;color:rgba(244,241,232,.88);
  background:linear-gradient(transparent,rgba(6,42,43,.8));
}

/* ===== 12. 章节目录 ===== */
.toc-nav{position:sticky;top:16px;font-size:13.5px}
.toc-nav__title{font-size:11.5px;font-weight:800;letter-spacing:.16em;color:var(--text-soft);margin-bottom:12px}
.toc-list{border-left:1px solid var(--mist)}
.toc-list a{
  display:block;padding:7px 12px;margin-left:-1px;
  border-left:2px solid transparent;color:var(--text-soft);font-weight:600;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.toc-list a:hover{color:var(--ink)}
.toc-list a[aria-current="location"]{
  color:var(--ink);border-left-color:var(--gold);
  background:linear-gradient(90deg,rgba(224,168,60,.16),transparent);
}

/* ===== 13. 滚动进度 / 返回顶部 / 显现 ===== */
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;z-index:120;
  transform:scaleX(0);transform-origin:0 50%;pointer-events:none;
  background:linear-gradient(90deg,var(--lime),var(--gold) 55%,var(--coral));
}
.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:110;
  width:48px;height:48px;border-radius:16px;display:grid;place-items:center;
  background:var(--ink);color:var(--gold-soft);font-size:18px;font-weight:800;
  border:1px solid rgba(224,168,60,.5);
  box-shadow:0 14px 30px rgba(6,42,43,.4);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--ink-mid);color:var(--lime)}

.js [data-reveal]{opacity:0;transform:translateY(24px);transition:opacity .52s var(--ease),transform .52s var(--ease)}
.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ===== 14. 响应式 ===== */
@media (max-width:1023px){
  .footer-gridwrap{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand__sig{max-width:44ch}
}
@media (max-width:899px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:0;right:0;bottom:0;width:min(84vw,340px);
    margin:0;padding:88px 22px 40px;z-index:70;overflow-y:auto;
    background:linear-gradient(165deg,#062A2B,#0B3B3C 50%,#11565A);
    border-left:1px solid rgba(224,168,60,.28);
    box-shadow:-28px 0 70px rgba(0,0,0,.45);
    transform:translateX(103%);
    transition:transform .42s var(--ease);
  }
  .nav-row[data-open] .primary-nav{transform:translateX(0)}
  .nav-row[data-open]::after{
    content:"";position:fixed;inset:0;z-index:65;
    background:rgba(6,42,43,.66);
  }
  .nav-row[data-open] .nav-toggle{position:fixed;top:14px;right:16px;margin:0}
  .nav-list{flex-direction:column;align-items:stretch;gap:6px}
  .nav-link{
    display:block;padding:15px 16px;font-size:17px;border-radius:14px;
    border:1px solid rgba(195,212,210,.12);background:rgba(244,241,232,.03);
  }
  .nav-link[aria-current="page"]{background:rgba(224,168,60,.14)}
  .nav-link[aria-current="page"]::after{
    left:0;right:auto;top:50%;bottom:auto;width:3px;height:22px;transform:translateY(-50%);
  }
  .media-frame--tall{aspect-ratio:4/5}
}
@media (max-width:719px){
  .brand-signature__text{display:none}
  .brand-signature__mark::after{display:none}
  .brand-bar__actions .btn--ghost{display:none}
  .brand-bar__inner{gap:12px}
  .section-label{letter-spacing:.12em}
}
@media (max-width:560px){
  .footer-cols{grid-template-columns:1fr;gap:26px}
  .footer-base__inner{justify-content:flex-start}
  .brand-bar__actions .btn{padding:8px 13px;font-size:12px}
  .badge{letter-spacing:.08em}
  .media-frame{border-radius:var(--radius-md)}
}

/* ===== 15. 减少动态 ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1 !important;transform:none !important}
  .to-top{transform:none}
}