/* ===== 01 · 令牌 ===== */
:root{
  --c-void:#0A1633;
  --c-panel:#12224A;
  --c-line:#223A6E;
  --c-mute:#9AA9C9;
  --c-white:#F4F7FF;
  --c-orange:#FF7A29;
  --c-orange-2:#FFA35C;
  --c-green:#4CE08A;
  --c-ink:#050B1C;
  --c-idle:#2A3A66;
  --cut:16px;
  --shell:1320px;
  --gut:clamp(18px,4vw,40px);
  --ease:cubic-bezier(.2,.7,.2,1);
  --header-h:76px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ===== 02 · 归零与基础排版 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--c-void);color:var(--c-white);font-family:var(--font-sans);font-size:16px;line-height:1.75;font-weight:400;overflow-x:hidden}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
h1,h2,h3,h4{font-weight:800;line-height:1.15;letter-spacing:-.02em}
:focus-visible{outline:2px solid var(--c-green);outline-offset:2px}
.is-locked,html.is-locked,body.is-locked{overflow:hidden}

.mono,.site-footer__icp{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.label{display:inline-block;font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--c-mute)}
.label--accent{color:var(--c-orange)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ===== 03 · 容器与栅格 ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gut)}
.site-main{padding-top:calc(var(--header-h) + 18px)}
#main-content{scroll-margin-top:calc(var(--header-h) + 18px)}
.grid{display:grid;gap:clamp(16px,2vw,24px)}
.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))}

/* ===== 04 · 跳跃链接与进度条 ===== */
.skip-link{position:fixed;top:10px;left:10px;z-index:130;padding:12px 18px;background:var(--c-orange);color:#08122A;font-size:14px;font-weight:700;transform:translateY(-180%);transition:transform .2s var(--ease)}
.skip-link:focus{transform:translateY(0)}
.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--c-orange),var(--c-green))}

/* ===== 05 · 页头 ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:105;color:var(--c-white);background:linear-gradient(180deg,rgba(5,11,28,.76),rgba(5,11,28,0));border-bottom:1px solid transparent;transition:transform .28s var(--ease),background-color .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease)}
.site-header[data-scrolled]{transform:translateY(8px);background-color:rgba(10,22,51,.96);border-bottom-color:var(--c-line);box-shadow:0 22px 44px -30px rgba(5,11,28,.95);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.site-header__bar{display:flex;align-items:center;gap:clamp(10px,2vw,28px);min-height:var(--header-h);max-width:var(--shell);margin-inline:auto;padding:8px var(--gut)}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;min-height:44px;padding:2px 4px}
.brand__mark{display:grid;place-items:center;width:40px;height:40px;background:var(--c-orange);color:#08122A;font-family:var(--font-mono);font-size:15px;font-weight:700;letter-spacing:.06em;clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);transition:background-color .18s var(--ease)}
.brand:hover .brand__mark,.brand:focus-visible .brand__mark{background:var(--c-orange-2)}
.brand__text{display:flex;flex-direction:column;gap:2px;line-height:1.15}
.brand__name{font-size:15px;font-weight:800;letter-spacing:.01em}
.brand__sub{font-size:10px;font-weight:500;letter-spacing:.16em;color:var(--c-mute)}

.site-nav{display:flex;flex:1 1 auto;justify-content:center;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__link{position:relative;display:block;padding:10px 14px;font-size:14px;font-weight:500;color:var(--c-mute);white-space:nowrap;transition:color .18s var(--ease)}
.site-nav__link::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--c-orange);transform:scaleX(0);transform-origin:0 50%;transition:transform .2s var(--ease)}
.site-nav__link:hover{color:var(--c-white)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--c-white);font-weight:700}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-green)}

.site-header__actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

.nav-toggle{display:none;align-items:center;gap:10px;min-width:44px;min-height:44px;padding:0 14px;color:var(--c-white);box-shadow:inset 0 0 0 1px var(--c-line);clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);transition:box-shadow .18s var(--ease),color .18s var(--ease)}
.nav-toggle:hover{box-shadow:inset 0 0 0 1px var(--c-orange)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:18px}
.nav-toggle__bars span{display:block;height:2px;background:currentColor;transition:transform .22s var(--ease)}
.nav-toggle__label{font-size:12px;letter-spacing:.14em}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3.5px) rotate(-45deg)}

/* ===== 06 · 按钮 ===== */
.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;font-size:14px;font-weight:700;letter-spacing:.02em;line-height:1;white-space:nowrap;clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);transition:background-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease)}
.btn--primary{background:var(--c-orange);color:#08122A}
.btn--primary:hover{background:var(--c-orange-2);transform:translateY(-2px)}
.btn--ghost{background:rgba(18,34,74,.55);color:var(--c-white);box-shadow:inset 0 0 0 1px var(--c-line)}
.btn--ghost:hover{color:var(--c-orange-2);box-shadow:inset 0 0 0 1px var(--c-orange);transform:translateY(-2px)}
.btn:focus-visible{outline:2px solid var(--c-green);outline-offset:-3px}
.btn--sm{min-height:38px;padding:0 14px;font-size:13px}
.btn--block{width:100%}

/* ===== 07 · 面包屑 / 章节抬头 / 文本 ===== */
.crumbs{padding-top:20px;font-size:12px}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono)}
.crumbs li{display:flex;align-items:center;gap:8px;color:var(--c-mute)}
.crumbs li+li::before{content:"/";color:var(--c-line)}
.crumbs a:hover{color:var(--c-orange-2)}

.prose{max-width:68ch;font-size:16px;font-weight:300;line-height:1.75}
.prose p{margin-bottom:1.1em;color:#DCE4F5}
.prose h2{font-size:clamp(22px,3vw,30px);margin:2em 0 .5em}
.prose h3{font-size:clamp(18px,2.2vw,22px);margin:1.6em 0 .4em}
.prose ul{margin:0 0 1.2em;padding-left:1.1em;list-style:none}
.prose li{position:relative;margin-bottom:.5em;color:#DCE4F5}
.prose li::before{content:"";position:absolute;left:-1.1em;top:.72em;width:6px;height:6px;background:var(--c-orange);clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%)}

.sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;padding-bottom:18px;margin-bottom:clamp(22px,4vw,40px);border-bottom:1px solid var(--c-line)}
.sec-head__index{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--c-orange)}
.sec-head__title{margin-top:8px;font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.15}
.sec-head__note{max-width:36ch;font-size:13px;line-height:1.7;color:var(--c-mute)}

/* ===== 08 · 面板 / 指标 / 图片容器 ===== */
.panel{position:relative;padding:clamp(20px,3vw,32px);background:var(--c-panel);box-shadow:inset 0 0 0 1px var(--c-line);clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)))}
.panel--alt{clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut))}

.stat{display:flex;flex-direction:column;gap:6px}
.stat__key{font-size:11px;letter-spacing:.16em;color:var(--c-mute)}
.stat__val{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(26px,3vw,40px);font-weight:700;line-height:1}
.stat__val small{font-size:.4em;font-weight:500;color:var(--c-mute);margin-left:.25em;letter-spacing:.04em}

.media{position:relative;overflow:hidden;background:var(--c-panel);clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,24px 100%,0 calc(100% - 24px))}
.media img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media--ph{background-image:linear-gradient(rgba(34,58,110,.55) 1px,transparent 1px),linear-gradient(90deg,rgba(34,58,110,.55) 1px,transparent 1px);background-size:8px 8px;background-color:var(--c-panel)}
.media__veil{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(5,11,28,.12),rgba(5,11,28,.78))}
.media__tag{position:absolute;left:16px;bottom:14px;z-index:2;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--c-green)}

/* ===== 09 · 分段标签 / 章节轨道 / 返回顶部 / 复制 ===== */
.tabs{display:flex;flex-direction:column;gap:22px}
.tabs__list{display:flex;flex-wrap:wrap;gap:6px;padding:6px;background:var(--c-panel);box-shadow:inset 0 0 0 1px var(--c-line);clip-path:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px)}
.tabs__btn{min-height:44px;padding:0 18px;font-size:14px;font-weight:600;color:var(--c-mute);transition:background-color .12s var(--ease),color .12s var(--ease)}
.tabs__btn:hover{color:var(--c-white)}
.tabs__btn[aria-selected="true"]{background:var(--c-orange);color:#08122A}
.tabs__panel{display:block;animation:tabsIn .12s var(--ease) both}
.tabs__panel[hidden]{display:none}
@keyframes tabsIn{from{opacity:0}to{opacity:1}}

.rail{display:none}
.rail__link{display:grid;place-items:center;width:36px;height:36px;font-family:var(--font-mono);font-size:11px;color:var(--c-mute);transition:color .18s var(--ease),box-shadow .18s var(--ease)}
.rail__link:hover{color:var(--c-white)}
.rail__link[data-active="true"]{color:var(--c-orange);box-shadow:inset 0 0 0 1px var(--c-orange);background:rgba(255,122,41,.08)}

.to-top{position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:95;display:grid;place-items:center;width:48px;height:48px;color:var(--c-white);background:var(--c-panel);box-shadow:inset 0 0 0 1px var(--c-line);clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s,box-shadow .18s var(--ease),color .18s var(--ease)}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--c-orange-2);box-shadow:inset 0 0 0 1px var(--c-orange)}
.to-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:square}
.to-top:focus-visible{outline:2px solid var(--c-green);outline-offset:-3px}

.copy-btn{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:0 10px;font-family:var(--font-mono);font-size:12px;color:var(--c-mute);box-shadow:inset 0 0 0 1px var(--c-line);transition:color .18s var(--ease),box-shadow .18s var(--ease)}
.copy-btn:hover{color:var(--c-white);box-shadow:inset 0 0 0 1px var(--c-orange)}
.copy-btn[data-copied="true"]{color:var(--c-green);box-shadow:inset 0 0 0 1px var(--c-green)}

.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .24s var(--ease),transform .24s var(--ease)}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ===== 10 · 页脚 ===== */
.site-footer{position:relative;margin-top:clamp(56px,8vw,120px);background:linear-gradient(180deg,var(--c-void) 0%,var(--c-ink) 100%);border-top:1px solid var(--c-line)}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:repeating-linear-gradient(115deg,var(--c-orange) 0 26px,transparent 26px 56px);opacity:.55}
.site-footer__top{display:grid;grid-template-columns:minmax(240px,1fr) 2fr;gap:clamp(28px,5vw,72px);padding:clamp(40px,6vw,80px) 0 clamp(26px,4vw,48px)}
.site-footer__brand{display:flex;flex-direction:column;gap:14px;max-width:340px}
.site-footer__mark{display:grid;place-items:center;width:46px;height:46px;background:var(--c-orange);color:#08122A;font-family:var(--font-mono);font-size:16px;font-weight:700;letter-spacing:.06em;clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%)}
.site-footer__name{font-size:22px;font-weight:800;letter-spacing:-.01em}
.site-footer__sub{font-size:13px;color:var(--c-mute)}
.site-footer__status{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;color:var(--c-green)}
.site-footer__status::before{content:"";width:8px;height:8px;background:var(--c-green);clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%)}
.site-footer__copy{font-size:12px;color:var(--c-idle);color:#4A5C88}
.site-footer__cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.foot-col__title{margin-bottom:14px;font-size:11px;font-weight:600;letter-spacing:.18em;color:var(--c-orange)}
.foot-col__list{display:flex;flex-direction:column;gap:10px}
.foot-col__list a{font-size:14px;color:var(--c-mute);transition:color .18s var(--ease)}
.foot-col__list a:hover{color:var(--c-white);text-decoration:underline;text-decoration-color:var(--c-orange);text-underline-offset:3px}
.foot-col__static{font-size:14px;color:var(--c-idle);color:#54679A}
.site-footer__bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;padding:20px 0 30px;border-top:1px solid var(--c-line)}
.site-footer__contact,.site-footer__addr,.site-footer__update{font-size:12px;line-height:1.7;color:var(--c-mute)}
.site-footer__contact .mono{color:var(--c-white)}
.site-footer__update{max-width:42ch;color:#54679A}
.site-footer__icp{font-size:12px;letter-spacing:.04em;color:var(--c-mute)}

/* ===== 11 · 响应式 ===== */
@media (max-width:1199px){
  .site-header__actions .btn--ghost{display:none}
}
@media (min-width:1200px){
  .rail{display:flex;position:fixed;left:0;top:50%;transform:translateY(-50%);z-index:70;width:64px;padding:14px 10px;flex-direction:column;align-items:center;gap:4px;background:linear-gradient(90deg,rgba(10,22,51,.92),rgba(10,22,51,0))}
}
@media (max-width:1023px){
  :root{--header-h:64px}
  .nav-toggle{display:inline-flex}
  .site-nav{position:fixed;top:0;right:0;z-index:104;width:min(340px,88vw);height:100vh;height:100dvh;flex-direction:column;justify-content:flex-start;padding:calc(var(--header-h) + 28px) 22px 40px;background:var(--c-panel);border-left:1px solid var(--c-line);overflow-y:auto;transform:translateX(103%);transition:transform .26s var(--ease)}
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav::before{content:"";position:fixed;inset:0;z-index:-1;background:rgba(5,11,28,.72);opacity:0;pointer-events:none;transition:opacity .26s var(--ease)}
  .site-nav[data-open]::before{opacity:1;pointer-events:auto}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;counter-reset:nav}
  .site-nav__list li{display:grid;grid-template-columns:40px 1fr;align-items:center;counter-increment:nav;border-bottom:1px solid rgba(34,58,110,.6)}
  .site-nav__list li::before{content:counter(nav,decimal-leading-zero);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--c-orange);padding-left:2px}
  .site-nav__link{padding:16px 4px;font-size:17px;font-weight:600;color:var(--c-white)}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{color:var(--c-orange-2)}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__top{grid-template-columns:minmax(0,1fr)}
  .brand__sub{font-size:9px;letter-spacing:.12em}
}
@media (max-width:639px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .brand{gap:9px}
  .brand__mark{width:36px;height:36px;font-size:13px}
  .brand__name{font-size:14px}
  .btn{padding:0 15px;font-size:13px}
  .media{clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px))}
  .panel{--cut:10px}
  .site-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 18px}
  .site-footer__bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:420px){
  .brand__sub{display:none}
}

/* ===== 12 · 无障碍动效 ===== */
@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;transform:none}
  .scroll-progress__bar{transition:none}
  .to-top{transform:none}
}