/* ===== 0. 变量与重置 ===== */
:root{
  --ink:#0E2A24;
  --ink-2:#14382F;
  --green:#1F4A3D;
  --gold:#C9A356;
  --gold-lit:#E6C87B;
  --red:#7A2320;
  --paper:#F4EFE6;
  --line:#DAD3C6;
  --stone:#6E6A61;
  --clay:#A85C3C;
  --gold-grad:linear-gradient(100deg,#8A672C 0%,#C9A356 30%,#E6C87B 50%,#C9A356 70%,#8A672C 100%);
  --hair:rgba(201,163,86,.36);
  --hair-soft:rgba(244,239,230,.14);
  --veil:rgba(9,26,21,.62);
  --header-h:80px;
  --shell:1320px;
  --gut:clamp(18px,4vw,56px);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --clip-cut:polygon(16px 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%,0 16px);
  --clip-cut-sm:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
h1,h2,h3,h4,h5{font-family:var(--serif);font-weight:600;letter-spacing:-.01em;line-height:1.18;color:inherit;text-wrap:balance}
p,li{text-wrap:pretty;line-break:strict;word-break:normal}
:focus-visible{outline:2px solid var(--gold-lit);outline-offset:3px}
::selection{background:rgba(201,163,86,.32);color:#fff}
body{
  background:var(--ink);
  color:rgba(244,239,230,.86);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.85;
  padding-top:var(--header-h);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
body.overlay-hero{padding-top:0}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}
.mono,.ver{font-family:var(--mono);letter-spacing:.08em}

/* ===== 1. 容器与排版 ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gut)}
.stack>*+*{margin-top:var(--stack-gap,1.1rem)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px}
.display{font-family:var(--serif);font-weight:600;font-size:clamp(42px,8.6vw,120px);line-height:.96;letter-spacing:-.03em;color:var(--paper)}
.h2{font-size:clamp(26px,3.4vw,40px)}
.h3{font-size:clamp(19px,2vw,26px)}
.lede{font-size:clamp(16.5px,1.5vw,20px);line-height:1.9;color:rgba(244,239,230,.76);max-width:34em}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.22em;color:var(--gold);text-transform:uppercase}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold-grad)}
.divider{height:1px;border:0;background:linear-gradient(90deg,var(--hair),rgba(201,163,86,0))}
.tick-rule{height:11px;background-image:repeating-linear-gradient(90deg,var(--hair) 0 1px,transparent 1px 14px);background-position:bottom left;background-size:auto 6px;background-repeat:repeat-x}
.prose{max-width:36em;color:#22322B}
.prose>*+*{margin-top:1.25em}
.prose h2{font-size:clamp(23px,2.6vw,32px);margin-top:2em;color:#123029}
.prose h3{font-size:20px;margin-top:1.7em;color:#123029}
.prose ul,.prose ol{padding-left:1.3em}
.prose ul{list-style:none}
.prose ul>li{position:relative;padding-left:.2em}
.prose ul>li::before{content:"";position:absolute;left:-1.1em;top:.85em;width:8px;height:1px;background:var(--red)}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.5em}
.prose a{color:#7A2320;text-decoration:underline;text-underline-offset:3px}
.prose strong{color:#12261F}
.prose--dark{color:rgba(244,239,230,.84)}
.prose--dark h2,.prose--dark h3,.prose--dark strong{color:var(--paper)}
.prose--dark a{color:var(--gold-lit)}

/* ===== 2. 分区 ===== */
.section{padding:clamp(52px,7.5vw,110px) 0;position:relative}
.section--ink2{background:var(--ink-2)}
.section--paper{background:var(--paper);color:#22322B;--hair:rgba(31,74,61,.3);--hair-soft:rgba(31,74,61,.16);--stone:#6E6A61}
.section--paper .eyebrow{color:#8A672C}
.section--paper .display,.section--paper .lede{color:#123029}
.section--paper .lede{color:#3D4B44}
.section__head{display:grid;gap:14px;margin-bottom:clamp(26px,4vw,48px)}

/* ===== 3. 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.6em;
  font-family:var(--sans);font-size:14px;font-weight:500;letter-spacing:.14em;
  padding:14px 26px;line-height:1;text-align:center;
  clip-path:var(--clip-cut-sm);transition:background .3s var(--ease),color .3s var(--ease),box-shadow .3s var(--ease);
}
.btn--gold{background:var(--gold-grad);color:#12261F;box-shadow:0 0 0 1px rgba(230,200,123,.45) inset}
.btn--gold:hover{background:linear-gradient(100deg,#C9A356,#F0DEA6 50%,#C9A356);color:#0E2A24}
.btn--ghost{background:linear-gradient(180deg,rgba(201,163,86,.2),rgba(201,163,86,.06));color:var(--gold-lit);box-shadow:0 0 0 1px var(--hair) inset}
.btn--ghost:hover{background:rgba(201,163,86,.28);color:#fff}
.btn--sm{font-size:12.5px;padding:11px 18px}
.btn--block{width:100%}

/* ===== 4. 网格与分屏 ===== */
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(210px,24%) minmax(0,1fr);gap:clamp(26px,4vw,64px);align-items:start}
.split__rail{min-width:0}
.split__canvas{min-width:0}
.rail{position:sticky;top:calc(var(--header-h) + 26px)}
.rail__title{font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;color:var(--gold);margin-bottom:14px}
.rail__list{display:grid}
.rail__link{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:11px 0;border-bottom:1px solid var(--hair-soft);color:rgba(244,239,230,.72);font-size:14.5px;transition:color .25s var(--ease)}
.rail__link:hover{color:#fff}
.rail__link[aria-current="true"]{color:var(--gold-lit)}
.rail__link[aria-current="true"] .rail__count{color:var(--gold)}
.rail__count{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--stone)}

/* ===== 5. 面板 / 标签 / 数据 ===== */
.cut-panel{position:relative;padding:1px;background:linear-gradient(150deg,rgba(201,163,86,.6),rgba(201,163,86,.06) 45%,rgba(201,163,86,.34));clip-path:var(--clip-cut)}
.cut-panel__inner{height:100%;padding:clamp(20px,2.4vw,32px);background:var(--green);clip-path:var(--clip-cut)}
.cut-panel--ink .cut-panel__inner{background:var(--ink-2)}
.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--gold-lit);background:rgba(201,163,86,.12);box-shadow:0 0 0 1px var(--hair) inset}
.tag--red{color:#F2D9CF;background:rgba(122,35,32,.6);box-shadow:0 0 0 1px rgba(122,35,32,.9) inset}
.tag--clay{color:#FDEFE6;background:rgba(168,92,60,.55);box-shadow:0 0 0 1px rgba(168,92,60,.85) inset}
.ver{color:var(--gold-lit)}
.stat{display:grid;gap:6px}
.stat__value{font-family:var(--mono);font-size:clamp(26px,3.4vw,40px);letter-spacing:.04em;color:var(--gold-lit)}
.stat__label{font-size:13px;color:var(--stone)}
.data-table{width:100%;border-collapse:collapse;font-size:14.5px}
.data-table th,.data-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--hair-soft);vertical-align:top}
.data-table th{font-family:var(--mono);font-weight:400;font-size:12px;letter-spacing:.12em;color:var(--gold)}
.data-table td.num{font-family:var(--mono);letter-spacing:.06em;color:var(--gold-lit)}
.data-table tbody tr:hover{background:rgba(201,163,86,.07)}
.steps{display:grid}
.step{position:relative;padding:0 0 26px 34px;border-left:1px solid var(--hair)}
.step:last-child{border-left-color:transparent;padding-bottom:0}
.step::before{content:"";position:absolute;left:-5px;top:6px;width:9px;height:9px;background:var(--gold);transform:rotate(45deg)}
.step__title{font-family:var(--serif);font-size:18px;color:var(--paper);margin-bottom:6px}
.step__body{font-size:14.5px;color:rgba(244,239,230,.72)}

/* ===== 6. 图片容器 ===== */
.media-frame{position:relative;display:block;overflow:hidden;background:linear-gradient(160deg,#1F4A3D,#0E2A24);clip-path:var(--clip-cut);box-shadow:inset 0 0 0 1px var(--hair)}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--3x4{aspect-ratio:3/4}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame__caption{position:absolute;left:0;right:0;bottom:0;padding:16px;font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--gold-lit);background:linear-gradient(0deg,rgba(9,26,21,.9),rgba(9,26,21,0))}
.media-frame--empty{display:grid;place-items:center;background-image:repeating-linear-gradient(135deg,rgba(201,163,86,.14) 0 1px,transparent 1px 12px),linear-gradient(160deg,#1F4A3D,#0E2A24)}
.media-frame__label{padding:22px;font-family:var(--mono);font-size:12px;line-height:1.7;letter-spacing:.18em;color:var(--gold);text-align:center}

/* ===== 7. 面包屑 ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:var(--stone)}
.breadcrumb__link{color:var(--stone);transition:color .25s var(--ease)}
.breadcrumb__link:hover{color:var(--gold-lit)}
.breadcrumb__sep{color:rgba(201,163,86,.55)}
.breadcrumb [aria-current="page"]{color:var(--gold)}

/* ===== 8. 页头 ===== */
.skip-link{position:fixed;top:10px;left:12px;z-index:120;transform:translateY(-160%);background:var(--gold);color:#12261F;font-size:13px;letter-spacing:.1em;padding:10px 16px;clip-path:var(--clip-cut-sm);transition:transform .24s var(--ease)}
.skip-link:focus{transform:translateY(0)}
.site-header{position:fixed;top:0;left:0;right:0;z-index:90;height:var(--header-h);display:flex;align-items:center;background:transparent;border-bottom:1px solid transparent;transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease)}
.site-header[data-solid="true"]{background:rgba(16,44,37,.95);border-bottom-color:var(--hair);box-shadow:0 12px 34px rgba(6,18,15,.42)}
.site-header__progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(244,239,230,.08)}
.site-header__bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:var(--gold-grad)}
.site-header__shell{display:flex;align-items:center;gap:clamp(14px,2.6vw,36px);width:100%}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--paper)}
.brand__seal{width:42px;height:42px;display:grid;place-items:center;background:var(--gold-grad);color:#12261F;font-family:var(--serif);font-size:20px;font-weight:600;clip-path:var(--clip-cut-sm)}
.brand__text{display:flex;flex-direction:column}
.brand__name{font-family:var(--serif);font-size:17px;font-weight:600;letter-spacing:.06em;line-height:1.2;color:var(--paper)}
.brand__sub{margin-top:3px;font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;color:var(--gold)}
.site-nav{margin-left:auto;display:flex;align-items:center}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.7vw,26px)}
.site-nav__link{position:relative;display:inline-flex;align-items:baseline;gap:6px;padding:10px 2px;font-size:15px;letter-spacing:.04em;color:rgba(244,239,230,.82);transition:color .25s var(--ease)}
.site-nav__num{font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:rgba(201,163,86,.7)}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;background:var(--gold-grad);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.site-nav__link:hover,.site-nav__link:focus-visible{color:#fff}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--gold-lit)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__note,.site-nav__cta{display:none}
.site-header__actions{display:flex;align-items:center;gap:12px;margin-left:clamp(8px,1.6vw,22px)}
.nav-toggle{display:none;align-items:center;gap:9px;padding:9px 12px;box-shadow:0 0 0 1px var(--hair) inset;color:var(--gold-lit);font-family:var(--mono);font-size:11px;letter-spacing:.14em;clip-path:var(--clip-cut-sm)}
.nav-toggle__bars{position:relative;width:20px;height:2px;background:var(--gold-lit);display:block}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:20px;height:2px;background:var(--gold-lit);transition:transform .25s var(--ease),top .25s var(--ease)}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

/* ===== 9. 页脚 ===== */
.site-footer{background:var(--ink);border-top:1px solid var(--hair)}
.site-footer__band{position:relative;background:var(--ink-2);padding:clamp(42px,6vw,80px) 0 clamp(36px,5vw,64px)}
.site-footer__ticks{position:absolute;top:0;left:0;right:0;opacity:.7}
.site-footer__grid{display:grid;grid-template-columns:minmax(260px,1.05fr) minmax(0,1.75fr);gap:clamp(30px,5vw,80px)}
.footer-brand{max-width:34em}
.footer-brand__seal{width:46px;height:46px;display:grid;place-items:center;background:var(--gold-grad);color:#12261F;font-family:var(--serif);font-size:21px;font-weight:600;clip-path:var(--clip-cut-sm);margin-bottom:16px}
.footer-brand__name{font-family:var(--serif);font-size:19px;font-weight:600;letter-spacing:.05em;color:var(--paper)}
.footer-brand__desc{margin-top:12px;font-size:14.5px;line-height:1.85;color:rgba(244,239,230,.68)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2.6vw,36px)}
.footer-col__title{font-family:var(--mono);font-size:11.5px;font-weight:400;letter-spacing:.2em;color:var(--gold);margin-bottom:16px}
.footer-col__list{display:grid;gap:12px}
.footer-col__link{position:relative;display:inline-block;padding-left:14px;font-size:14.5px;color:rgba(244,239,230,.74);transition:color .25s var(--ease)}
.footer-col__link::before{content:"";position:absolute;left:0;top:.8em;width:6px;height:1px;background:var(--gold);transition:width .25s var(--ease)}
.footer-col__link:hover{color:var(--gold-lit)}
.footer-col__link:hover::before{width:10px}
.footer-col__link[aria-current="page"]{color:var(--gold-lit)}
.site-footer__bar{background:var(--ink);padding:clamp(22px,3vw,34px) 0;border-top:1px solid var(--hair-soft)}
.site-footer__meta{display:grid;gap:8px}
.footer-line{font-size:13.5px;letter-spacing:.02em;color:rgba(244,239,230,.62)}
.footer-line .mono{color:rgba(244,239,230,.86)}
.footer-line--legal{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--stone)}
.footer-sep{color:rgba(201,163,86,.6)}
.copy-btn{margin-left:8px;padding:2px 8px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--gold);box-shadow:0 0 0 1px var(--hair) inset;transition:color .25s var(--ease),background .25s var(--ease)}
.copy-btn:hover{color:var(--gold-lit);background:rgba(201,163,86,.14)}
.copy-btn[data-copied="true"]{background:var(--gold);color:#12261F}

/* ===== 10. 返回顶部与显现 ===== */
.to-top{
  position:fixed;right:clamp(16px,3vw,34px);bottom:clamp(16px,3vw,34px);z-index:80;
  width:52px;height:52px;display:grid;place-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;line-height:1.25;text-align:center;
  color:var(--gold-lit);background:rgba(20,56,47,.94);box-shadow:inset 0 0 0 1px var(--hair);
  clip-path:var(--clip-cut-sm);
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity .3s var(--ease),transform .3s var(--ease),background .3s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;transform:translateY(0);pointer-events:auto}
.to-top:hover{background:rgba(31,74,61,.98);color:#fff}
html.js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js [data-reveal][data-revealed="true"]{opacity:1;transform:none}

/* ===== 11. 响应式 ===== */
@media (max-width:1180px){
  .site-nav__link{font-size:14px}
  .brand__sub{letter-spacing:.12em}
}
@media (max-width:1023px){
  :root{--header-h:66px}
  body.overlay-hero{padding-top:0}
  .nav-toggle{display:inline-flex}
  .site-header__cta{display:none}
  .site-nav{
    position:fixed;top:var(--header-h);right:0;width:min(360px,90vw);
    height:calc(100vh - var(--header-h));height:calc(100dvh - var(--header-h));
    margin-left:0;padding:26px var(--gut) 44px;display:flex;flex-direction:column;align-items:stretch;
    background:linear-gradient(180deg,#14382F,#0E2A24);border-left:1px solid var(--hair);
    overflow-y:auto;transform:translateX(102%);visibility:hidden;
    transition:transform .34s var(--ease),visibility .34s linear;
  }
  .site-header[data-open="true"] .site-nav{transform:translateX(0);visibility:visible}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{justify-content:space-between;padding:16px 0;font-size:18px;border-bottom:1px solid var(--hair-soft)}
  .site-nav__link::after{display:none}
  .site-nav__note{display:block;margin-top:24px;font-size:13px;line-height:1.8;color:rgba(244,239,230,.6)}
  .site-nav__cta{display:inline-flex;margin-top:22px}
  html[data-nav-open]{overflow:hidden}
  html[data-nav-open] body::after{content:"";position:fixed;inset:0;background:var(--veil);z-index:70}
  .split{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;top:auto}
  .site-footer__grid{grid-template-columns:minmax(0,1fr)}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:639px){
  body{font-size:16px;line-height:1.8}
  .brand__seal{width:36px;height:36px;font-size:17px}
  .brand__name{font-size:15px}
  .brand__sub{font-size:9.5px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .data-table{font-size:13.5px}
  .data-table th,.data-table td{padding:10px}
  .to-top{width:46px;height:46px;font-size:10px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important}
  html.js [data-reveal]{opacity:1;transform:none}
  .site-nav{transition:none}
}