*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit}
[hidden]{display:none!important}

:root{
  --ink:#0B1B2B;
  --ink-deep:#111820;
  --ink-soft:#0C1E2E;
  --field:#1F6F5C;
  --felt:#2E7D5B;
  --ivory:#F3EBDD;
  --bone:#E8E0D0;
  --gold:#C9A227;
  --stone:#5C6670;
  --stone-lit:#8A96A2;
  --clay:#B86B4B;
  --mist:#8FB9A8;
  --rail-w:236px;
  --head-h:64px;
  --gutter:24px;
  --hair:rgba(243,235,221,.16);
  --hair-soft:rgba(243,235,221,.09);
  --hair-strong:rgba(243,235,221,.34);
  --shadow-hard:8px 8px 0 rgba(0,0,0,.42);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    linear-gradient(var(--hair-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--hair-soft) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--ivory);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  overflow-x:hidden;
}

h1,h2,h3{font-weight:800;line-height:1.2;letter-spacing:.01em}
h1{font-size:clamp(34px,4.4vw,56px);font-weight:900}
h2{font-size:clamp(26px,2.6vw,38px)}
h3{font-size:clamp(20px,1.6px + 1vw,24px)}

::selection{background:var(--gold);color:var(--ink-deep)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

/* ---------- 通用组件 ---------- */
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 24px}

.breadcrumb{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--mist)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;list-style:none}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:var(--stone-lit)}
.breadcrumb a{color:var(--bone);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .16s ease,color .16s ease}
.breadcrumb a:hover{color:var(--gold);border-bottom-color:var(--gold)}
.breadcrumb [aria-current="page"]{color:var(--gold)}

.prose{max-width:76ch;color:var(--ink-deep);background:var(--bone);padding:28px 30px;border:1px solid rgba(17,24,32,.16);line-height:1.9}
.prose h2{margin:1.6em 0 .6em;font-size:24px;color:var(--ink-deep)}
.prose h3{margin:1.4em 0 .5em;font-size:19px;color:var(--ink-deep)}
.prose p{margin:0 0 1em}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1em}
.prose li{margin-bottom:.35em}
.prose a{color:var(--field);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--ink-deep);font-weight:700}

.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}
.grid--split{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--index{grid-template-columns:repeat(3,minmax(0,1fr))}

.panel{background:rgba(9,22,34,.88);border:1px solid var(--hair);box-shadow:var(--shadow-hard);padding:22px}

.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;padding:3px 8px;border:1px solid var(--hair-strong);color:var(--mist);background:rgba(143,185,168,.08)}
.tag--gold{color:var(--gold);border-color:rgba(201,162,39,.5);background:rgba(201,162,39,.1)}
.tag--clay{color:#E3A184;border-color:rgba(184,107,75,.6);background:rgba(184,107,75,.14)}
.tag--field{color:#8FD3BE;border-color:rgba(31,111,92,.8);background:rgba(31,111,92,.25)}

.media-frame{position:relative;overflow:hidden;border:1px solid var(--hair);background:linear-gradient(135deg,rgba(31,111,92,.38),rgba(11,27,43,.92));aspect-ratio:16/10}
.media-frame>img{width:100%;height:100%;object-fit:cover}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(90deg,rgba(243,235,221,.07) 1px,transparent 1px),linear-gradient(rgba(243,235,221,.07) 1px,transparent 1px);background-size:48px 48px}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}

.section-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px;padding-bottom:12px;margin-bottom:24px;border-bottom:1px solid var(--hair)}
.rule{height:1px;border:0;margin:32px 0;background:var(--hair)}

.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;font-family:var(--font-sans);font-size:14px;font-weight:700;line-height:1.3;letter-spacing:.04em;text-decoration:none;border:1px solid transparent;cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--field);color:var(--ivory);border-color:rgba(143,185,168,.55)}
.btn--primary:hover{background:var(--felt)}
.btn--gold{background:var(--gold);color:var(--ink-deep);border-color:#DDB63A}
.btn--gold:hover{background:#DDB63A}
.btn--ghost{background:transparent;color:var(--bone);border-color:var(--hair-strong)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--block{width:100%}
.btn:focus-visible{outline:2px solid var(--gold);outline-offset:-4px}

/* ---------- skip link ---------- */
.skip-link{position:fixed;top:-120px;left:16px;z-index:200;padding:10px 18px;background:var(--gold);color:var(--ink-deep);font-weight:700;font-size:14px;text-decoration:none;clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);transition:top .14s ease}
.skip-link:focus{top:16px}

/* ---------- header 品牌轨道 ---------- */
.site-header{
  position:fixed;top:0;bottom:0;left:0;z-index:80;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  color:var(--ivory);
  background:linear-gradient(180deg,#0B1B2B 0%,#0A1A29 55%,#0D2434 100%);
  border-right:1px solid var(--hair);
  box-shadow:1px 0 0 rgba(0,0,0,.45);
}
.header-rail{display:flex;flex-direction:column;flex:1 1 auto;min-height:0}

.rail-top{position:relative;display:flex;flex-direction:column;gap:14px;padding:22px 20px 20px;border-bottom:1px solid var(--hair)}
.rail-top::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:3px;background:linear-gradient(90deg,var(--field),var(--felt) 45%,var(--gold) 100%);clip-path:polygon(0 0,100% 0,calc(100% - 16px) 100%,0 100%)}

.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ivory)}
.brand-mark{position:relative;width:36px;height:36px;flex:none;display:grid;place-items:center;background:linear-gradient(150deg,var(--field),#12483C 78%);border:1px solid var(--hair-strong);clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%)}
.brand-mark__tile{width:12px;height:12px;background:var(--gold);transform:rotate(45deg);box-shadow:0 0 0 2px rgba(11,27,43,.6)}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{font-size:17px;font-weight:900;letter-spacing:.08em;line-height:1.25}
.brand-sub{font-family:var(--font-mono);font-size:10px;line-height:1.55;letter-spacing:.05em;color:var(--mist);max-width:15em}

.nav-toggle{display:none;align-items:center;gap:8px;padding:7px 12px;background:rgba(243,235,221,.06);border:1px solid var(--hair-strong);color:var(--ivory);font-size:12px;letter-spacing:.08em;cursor:pointer;clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);transition:background-color .16s ease,border-color .16s ease}
.nav-toggle:hover{background:rgba(31,111,92,.35);border-color:var(--gold)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;width:100%;background:currentColor}
.nav-toggle__bars i:nth-child(3){width:66%}
.nav-toggle__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em}
.nav-toggle:focus-visible{outline:2px solid var(--gold);outline-offset:-3px}

.site-nav{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;padding-top:14px}
.nav-list{display:flex;flex-direction:column;gap:2px;margin:0;padding:0;list-style:none}
.nav-item{display:block}
.nav-link{
  position:relative;display:flex;align-items:baseline;gap:10px;
  padding:11px 26px 11px 20px;
  color:var(--bone);text-decoration:none;font-size:14.5px;letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%);
  transition:background-color .16s ease,color .16s ease;
}
.nav-link::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--mist);transform:scaleY(0);transform-origin:top center;transition:transform .16s ease}
.nav-link:hover{background:rgba(31,111,92,.26);color:var(--ivory)}
.nav-link:hover::before{transform:scaleY(1)}
.nav-link[aria-current="page"]{background:linear-gradient(90deg,rgba(46,125,91,.58),rgba(31,111,92,.14));color:var(--ivory)}
.nav-link[aria-current="page"]::before{transform:scaleY(1);background:var(--gold)}
.nav-link[aria-current="page"] .nav-index{color:var(--gold)}
.nav-index{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;color:var(--stone-lit)}
.nav-label{display:inline-block}

.nav-foot{margin-top:auto;display:grid;gap:12px;padding:18px 20px 22px;border-top:1px solid var(--hair)}
.nav-foot__meta{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--stone-lit)}

.rail-tools{display:grid;gap:8px;padding:14px 20px 20px}
.rail-search{
  display:grid;gap:3px;width:100%;text-align:left;cursor:pointer;
  padding:10px 12px;
  background:rgba(143,185,168,.08);
  border:1px solid var(--hair);
  color:var(--ivory);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color .16s ease,border-color .16s ease;
}
.rail-search:hover{background:rgba(31,111,92,.32);border-color:var(--hair-strong)}
.rail-search:focus-visible{outline:2px solid var(--gold);outline-offset:-3px}
.rail-search__label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--gold)}
.rail-search__hint{font-size:12px;line-height:1.5;color:var(--mist)}

/* 检索浮层 */
.search-panel{display:none;padding:16px 20px 20px;background:#081520;border-top:1px solid var(--hair-strong);box-shadow:0 24px 48px rgba(0,0,0,.55)}
.search-panel[data-open]{display:block}
.search-panel__inner{display:grid;gap:10px}
.search-label{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;color:var(--gold)}
.search-input{width:100%;padding:10px 12px;background:rgba(243,235,221,.06);border:1px solid var(--hair-strong);border-radius:0;color:var(--ivory);font-family:var(--font-sans);font-size:14px;line-height:1.5}
.search-input::placeholder{color:rgba(243,235,221,.45)}
.search-input:focus-visible{outline:2px solid var(--gold);outline-offset:0;border-color:var(--gold)}
.search-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;line-height:1.6;color:var(--mist)}
.search-count{color:var(--gold);font-weight:700}
.search-empty{font-size:12px;line-height:1.6;color:#E3A184;border-left:2px solid var(--clay);padding-left:8px}
.search-close{justify-self:start;padding:5px 10px;background:transparent;border:1px solid var(--hair-strong);color:var(--bone);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;cursor:pointer;transition:color .16s ease,border-color .16s ease}
.search-close:hover{color:var(--gold);border-color:var(--gold)}

.rail-progress{position:absolute;left:0;right:0;bottom:0;height:3px;background:linear-gradient(90deg,var(--field),var(--felt) 55%,var(--gold));transform:scaleX(var(--p,0));transform-origin:left center;pointer-events:none;transition:transform .12s linear}

/* ---------- footer ---------- */
.site-footer{position:relative;margin-top:72px;background:linear-gradient(180deg,#0A1825 0%,#07131F 100%);border-top:1px solid var(--hair-strong);color:var(--bone)}
.footer-ruler{display:flex;height:8px;overflow:hidden}
.footer-ruler span{flex:1 1 0;background:rgba(143,185,168,.16);clip-path:polygon(10px 0,100% 0,calc(100% - 10px) 100%,0 100%)}
.footer-ruler span:nth-child(2n){background:rgba(46,125,91,.44)}
.footer-ruler span:nth-child(3n){background:rgba(201,162,39,.55)}
.footer-ruler span:nth-child(5n){background:rgba(184,107,75,.5)}

.footer-inner{display:grid;grid-template-columns:1.5fr 1fr 1.35fr 1fr;gap:32px;max-width:1280px;margin:0 auto;padding:44px 24px 36px}
.footer-brand{min-width:0}
.footer-kicker{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--gold);margin-bottom:6px}
.footer-name{font-size:26px;font-weight:900;letter-spacing:.1em;line-height:1.2;color:var(--ivory)}
.footer-line{max-width:24em;margin:8px 0 18px;font-size:13.5px;line-height:1.7;color:var(--mist)}

.footer-col{min-width:0;align-content:start}
.footer-col--nav,.footer-col--legal{min-width:0;align-content:start}
.footer-col--contact{min-width:0}
.footer-head{margin:0 0 14px;padding-bottom:8px;font-family:var(--font-mono);font-size:10.5px;font-weight:600;letter-spacing:.2em;color:var(--stone-lit);border-bottom:1px solid var(--hair)}

.footer-links{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.footer-links a{position:relative;display:inline-block;padding-left:12px;font-size:13.5px;line-height:1.7;color:var(--bone);text-decoration:none;transition:color .16s ease,transform .16s ease}
.footer-links a::before{content:"";position:absolute;left:0;top:.62em;width:6px;height:6px;background:var(--field);transform:rotate(45deg);transition:background-color .16s ease}
.footer-links a:hover{color:var(--gold);transform:translateX(2px)}
.footer-links a:hover::before{background:var(--gold)}

.contact-list{display:grid;gap:14px;margin:0}
.contact-row{display:grid;gap:2px}
.contact-row dt{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--stone-lit)}
.contact-row dd{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13.5px;line-height:1.65;color:var(--bone)}
.contact-value{word-break:break-all}

.copy-btn{position:relative;padding:3px 8px;background:transparent;border:1px solid var(--hair-strong);color:var(--mist);font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;cursor:pointer;transition:color .16s ease,border-color .16s ease}
.copy-btn:hover{color:var(--gold);border-color:var(--gold)}
.copy-btn:focus-visible{outline:2px solid var(--gold);outline-offset:-3px}
.copy-btn[data-copied]::after{content:attr(data-copied);position:absolute;left:0;bottom:calc(100% + 6px);z-index:6;padding:3px 8px;background:var(--gold);color:var(--ink-deep);font-size:10.5px;letter-spacing:.06em;white-space:nowrap}

.footer-base{display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;max-width:1280px;margin:0 auto;padding:20px 24px 32px;border-top:1px solid var(--hair);font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--stone-lit)}
.footer-copy,.footer-icp{margin:0}
.footer-icp{color:var(--mist)}
.footer-note{flex:1 1 100%;margin:0;font-family:var(--font-sans);font-size:11.5px;letter-spacing:0;line-height:1.7;color:rgba(243,235,221,.52)}

/* ---------- 桌面 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .nav-toggle{display:none}
  .search-panel{position:absolute;top:0;left:var(--rail-w);width:360px;max-height:100vh;overflow-y:auto;border:1px solid var(--hair-strong);border-left:0;box-shadow:14px 14px 0 rgba(0,0,0,.45)}
}
@media (min-width:1024px) and (max-height:660px){
  .rail-top{padding:16px 20px 14px;gap:10px}
  .brand-sub{display:none}
  .nav-link{padding:8px 26px 8px 20px;font-size:13.5px}
  .nav-foot{padding:12px 20px 14px;gap:8px}
  .rail-tools{padding-bottom:14px}
}

/* ---------- 平板与手机 ---------- */
@media (max-width:1023px){
  body{padding-left:0}
  .site-header{
    position:sticky;top:0;left:auto;right:auto;bottom:auto;
    width:100%;min-height:var(--head-h);
    flex-direction:row;align-items:center;justify-content:space-between;gap:10px;
    padding:0 16px;
    background:rgba(11,27,43,.97);
    border-right:0;border-bottom:1px solid var(--hair-strong);
    box-shadow:0 10px 24px rgba(0,0,0,.38);
    -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  }
  .header-rail{flex-direction:row;align-items:center;justify-content:space-between;gap:10px;width:100%;padding:10px 0}
  .rail-top{flex:1 1 auto;flex-direction:row;align-items:center;padding:0;border-bottom:0}
  .rail-top::after{display:none}
  .brand-mark{width:30px;height:30px}
  .brand-name{font-size:15px}
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;flex-direction:column;
    padding:8px 0 18px;
    background:#0B1D2C;
    border-bottom:1px solid var(--hair-strong);
    box-shadow:0 28px 48px rgba(0,0,0,.6);
    max-height:calc(100vh - var(--head-h));
    overflow-y:auto;
  }
  .site-nav[data-open]{display:flex}
  .nav-link{padding:13px 18px;font-size:15px;clip-path:none}
  .nav-foot{padding:16px 18px 4px;margin-top:8px}
  .rail-tools{flex:0 0 auto;padding:0}
  .rail-search{width:auto;padding:8px 10px;clip-path:none}
  .rail-search__hint{display:none}
  .search-panel{position:absolute;top:100%;left:0;right:0;max-height:calc(100vh - var(--head-h));overflow-y:auto}
  .rail-progress{height:2px}
}

@media (max-width:1023px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
  .footer-col--contact{grid-column:1/-1}
}
@media (max-width:639px){
  .container{padding:0 16px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split,.grid--index{grid-template-columns:1fr}
  .prose{padding:20px 18px}
  .site-footer{margin-top:48px}
  .footer-inner{grid-template-columns:1fr;gap:26px;padding:32px 16px 26px}
  .footer-base{padding:18px 16px 28px}
  .footer-name{font-size:22px}
}
@media (min-width:640px) and (max-width:1023px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .grid--index{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .rail-progress{transition:none}
}