:root{
  --navy:#0B1F3A;
  --midnight:#071426;
  --maple:#C8102E;
  --maple-deep:#8F0B21;
  --signal:#E23A4E;
  --ice:#DCE6F2;
  --paper:#F7F9FC;
  --aurora:#2EE6A6;
  --amber:#F2B84B;
  --mist:#8FA6C4;
  --graphite:#1C2733;
  --line:rgba(143,166,196,.32);
  --line-dark:rgba(220,230,242,.16);
  --blueprint:linear-gradient(to right,rgba(143,166,196,.14) 1px,transparent 1px),linear-gradient(to bottom,rgba(143,166,196,.14) 1px,transparent 1px);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --wrap:1180px;
  --pad:20px;
  --radius:6px;
  --ease:cubic-bezier(.4,.1,.2,1);
  --shadow-soft:0 18px 40px -30px rgba(7,20,38,.55);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.75;color:var(--graphite);background:var(--paper);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:800;line-height:1.18;letter-spacing:-.02em;color:var(--navy)}
p{margin:0}
a{color:inherit;text-decoration:none}
ul,ol,dl{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
#main-content{scroll-margin-top:130px}
main :target{scroll-margin-top:130px}

:where(a,button,[tabindex],summary,input,select,textarea):focus-visible{outline:2px solid var(--aurora);outline-offset:3px;border-radius:2px}

.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}

/* ---------- 通用排版与版式组件 ---------- */
.section{padding-block:clamp(48px,7vw,96px)}
.section--navy{background:var(--navy);color:var(--ice)}
.section--navy h2,.section--navy h3,.section--navy h4{color:#fff}
.section--ice{background:var(--ice)}
.section--line{border-top:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 28px;padding-bottom:16px;margin-bottom:clamp(24px,3vw,40px);border-bottom:1px solid var(--line)}
.section--navy .section-head{border-bottom-color:var(--line-dark)}
.section-title{font-size:clamp(26px,3.4vw,40px)}
.eyebrow{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--maple)}
.section--navy .eyebrow{color:var(--amber)}
.lede{max-width:62ch;font-size:clamp(16px,1.4vw,18px);color:#3c4b5c}
.section--navy .lede{color:var(--ice)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.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))}

.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 24px;border:1px solid transparent;border-radius:4px;font-size:15px;font-weight:700;letter-spacing:.02em;transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--maple);color:#fff}
.btn--primary:hover{background:var(--signal)}
.btn--ghost{border-color:rgba(220,230,242,.42);color:var(--ice)}
.btn--ghost:hover{border-color:var(--aurora);color:#fff}
.btn--dark{border-color:var(--navy);color:var(--navy)}
.btn--dark:hover{background:var(--navy);color:#fff}

.breadcrumb{padding-block:14px;border-bottom:1px solid var(--line);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{color:var(--navy);border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--maple);border-bottom-color:var(--maple)}
.breadcrumb__sep{color:var(--mist)}
.breadcrumb__current{color:var(--graphite)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;background:rgba(220,230,242,.55);font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--navy)}
.tag--aurora{border-color:rgba(46,230,166,.5);background:rgba(46,230,166,.14);color:#0d6b4b}

.rule{border:0;border-top:1px solid var(--line);margin-block:32px}
.prose{max-width:70ch}
.prose p+p{margin-top:1em}
.prose h3{margin-top:1.8em;margin-bottom:.6em;font-size:clamp(20px,2.2vw,26px)}

.data-table{border:1px solid var(--line);border-radius:4px;overflow:hidden;font-size:14px}
.data-table th,.data-table td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.data-table th{background:var(--ice);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--navy)}
.data-table tr:last-child td{border-bottom:0}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{position:relative;margin:0;overflow:hidden;aspect-ratio:16/10;border:1px solid var(--line);border-radius:var(--radius);background:var(--blueprint),linear-gradient(160deg,#12315a,#071426);background-size:48px 48px,auto;box-shadow:var(--shadow-soft)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--light{border-color:var(--line);background:var(--blueprint),linear-gradient(160deg,#eaf1fa,#d5e1ef);background-size:48px 48px,auto}
.media-frame__img{width:100%;height:100%;object-fit:cover;opacity:.92}
.media-frame__caption{position:absolute;inset-inline:0;bottom:0;padding:10px 14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice);background:linear-gradient(0deg,rgba(7,20,38,.9),rgba(7,20,38,0))}
.media-frame--light .media-frame__caption{color:var(--navy);background:linear-gradient(0deg,rgba(247,249,252,.95),rgba(247,249,252,0))}

/* ---------- 头部 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--navy);color:var(--ice);border-bottom:1px solid var(--line-dark);box-shadow:0 14px 34px -26px rgba(7,20,38,.95)}

.skip-link{position:fixed;left:16px;top:-90px;z-index:200;padding:12px 20px;border-radius:0 0 6px 6px;background:var(--aurora);color:var(--midnight);font-weight:700;transition:top .2s var(--ease)}
.skip-link:focus{top:0}

.scroll-meter{position:absolute;inset-inline:0;bottom:-1px;height:2px;background:rgba(143,166,196,.18);pointer-events:none}
.scroll-meter__bar{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--maple),var(--amber));transition:width .12s linear}

.header-utility{background:var(--midnight);border-bottom:1px solid var(--line-dark)}
.header-utility__inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 20px;min-height:38px;padding-block:6px}
.header-utility__edition{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--mist)}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--mist);flex:0 0 auto}
.dot--live{background:var(--aurora);box-shadow:0 0 0 4px rgba(46,230,166,.14);animation:dotPulse 2.8s ease-in-out infinite}
@keyframes dotPulse{0%,100%{box-shadow:0 0 0 4px rgba(46,230,166,.14)}50%{box-shadow:0 0 0 7px rgba(46,230,166,.05)}}

.utility-index{display:flex;flex-wrap:wrap;align-items:center;gap:6px 20px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.utility-index__link{color:var(--ice);padding-bottom:2px;border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.utility-index__link:hover{color:#fff;border-bottom-color:var(--maple)}

.masthead{position:relative;display:flex;flex-wrap:wrap;align-items:center;gap:14px 24px;padding-block:16px}
.masthead__brand{display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"mark name" "mark sub";column-gap:14px;row-gap:2px;align-items:center;min-width:0}
.masthead__mark{grid-area:mark;display:grid;place-items:center;width:46px;height:46px;border-radius:4px;background:linear-gradient(150deg,var(--maple),var(--maple-deep));color:#fff;font-family:var(--font-mono);font-size:18px;font-weight:700;letter-spacing:-.04em;box-shadow:inset 0 0 0 1px rgba(255,255,255,.18)}
.masthead__name{grid-area:name;font-size:clamp(20px,2.4vw,26px);font-weight:800;letter-spacing:-.02em;color:#fff;line-height:1.2}
.masthead__sub{grid-area:sub;font-family:var(--font-mono);font-size:10px;letter-spacing:.26em;color:var(--mist);text-transform:uppercase}
.masthead__slot{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

.version-chip{display:inline-flex;align-items:baseline;gap:8px;padding:8px 12px;border:1px solid rgba(242,184,75,.45);border-radius:4px;background:rgba(242,184,75,.08);font-family:var(--font-mono)}
.version-chip__label{font-size:10px;letter-spacing:.2em;color:var(--amber);opacity:.85}
.version-chip__value{font-size:14px;font-weight:700;letter-spacing:.06em;color:var(--amber)}

.cert-entry{display:inline-flex;align-items:center;gap:9px;padding:9px 16px;border:1px solid var(--maple);border-radius:4px;background:rgba(200,16,46,.16);color:#fff;font-size:14px;font-weight:700;transition:background .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}
.cert-entry:hover{background:rgba(200,16,46,.32);border-color:var(--signal);box-shadow:0 0 0 3px rgba(200,16,46,.16)}
.cert-entry__badge{display:grid;place-items:center;width:16px;height:16px;border-radius:50%;background:var(--aurora);color:var(--midnight);font-size:10px;font-weight:900;line-height:1}

.nav-toggle{display:inline-flex;align-items:center;gap:10px;padding:10px 14px;border:1px solid rgba(220,230,242,.36);border-radius:4px;background:transparent;color:var(--ice);font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;transition:border-color .2s var(--ease),background .2s var(--ease),color .2s var(--ease)}
.nav-toggle:hover{border-color:var(--aurora);color:#fff}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:currentColor;transition:background .2s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;transition:transform .22s var(--ease),top .22s var(--ease)}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__text{line-height:1}

.site-nav{max-height:0;overflow:hidden;opacity:0;visibility:hidden;border-top:1px solid var(--line-dark);background:linear-gradient(180deg,rgba(7,20,38,.55),rgba(11,31,58,0));transition:max-height .34s var(--ease),opacity .24s var(--ease),visibility .24s var(--ease)}
.site-nav[data-open]{max-height:75vh;overflow-y:auto;opacity:1;visibility:visible}
.site-nav__list{display:flex;flex-direction:column;padding-block:6px}
.site-nav__link{position:relative;display:block;padding:12px 4px;font-size:15px;color:var(--ice);border-bottom:1px solid rgba(220,230,242,.08);transition:color .18s var(--ease),background .18s var(--ease)}
.site-nav__link:hover{color:#fff}
.site-nav__link[aria-current="page"]{color:#fff;font-weight:700;background:rgba(200,16,46,.18)}
.site-nav__link::after{content:"";position:absolute;left:4px;bottom:-3px;width:34px;height:2px;background:var(--maple);transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;overflow:hidden;background:var(--midnight);color:var(--ice);border-top:2px solid var(--maple)}
.site-footer::before{content:"";position:absolute;inset:0;background-image:var(--blueprint);background-size:72px 72px;opacity:.55;pointer-events:none}
.footer-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:clamp(24px,3vw,44px);padding-block:clamp(36px,5vw,64px)}
.footer-brand__name{font-size:clamp(22px,2.4vw,28px);font-weight:800;letter-spacing:-.02em;color:#fff;line-height:1.2}
.footer-brand__note{display:flex;align-items:center;gap:9px;margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--amber)}
.footer-brand__desc{max-width:34ch;margin-top:14px;font-size:14px;line-height:1.75;color:rgba(220,230,242,.72)}
.footer-col__title{padding-bottom:10px;margin-bottom:14px;border-bottom:1px solid var(--line-dark);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}
.footer-list{display:flex;flex-direction:column;gap:9px;font-size:14px}
.footer-list__link{color:rgba(220,230,242,.82);border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.footer-list__link:hover{color:#fff;border-bottom-color:var(--maple)}
.footer-col--contact .footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact__row{display:flex;gap:10px;align-items:baseline;font-size:14px}
.footer-contact__label{flex:0 0 auto;min-width:34px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--mist)}
.footer-contact__value{color:#fff;word-break:break-word;line-height:1.6}
.footer-note{margin-top:16px;padding-left:12px;border-left:2px solid var(--maple);font-size:13px;line-height:1.7;color:rgba(220,230,242,.66)}
.footer-base{position:relative;z-index:1;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;padding-block:18px;border-top:1px solid var(--line-dark);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}
.footer-base__legal{color:var(--ice)}

/* ---------- 交互辅助 ---------- */
.is-current{color:var(--maple);font-weight:700}
.to-top{position:fixed;right:20px;bottom:24px;z-index:80;display:grid;place-items:center;width:46px;height:46px;border:1px solid rgba(220,230,242,.4);border-radius:50%;background:rgba(11,31,58,.94);color:var(--ice);font-family:var(--font-mono);font-size:16px;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease),border-color .18s var(--ease),color .18s var(--ease)}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--aurora);color:#fff}

/* ---------- 响应式 ---------- */
@media (max-width:939px){
  .masthead__brand{order:1;flex:1 1 auto}
  .nav-toggle{order:2;flex:0 0 auto}
  .masthead__slot{order:3;flex:1 1 100%}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:940px){
  .masthead__brand{flex:0 1 auto}
  .masthead__slot{margin-left:auto}
  .nav-toggle{display:none}
  .site-nav{max-height:none;overflow:visible;opacity:1;visibility:visible;transition:none}
  .site-nav__list{flex-direction:row;flex-wrap:wrap;justify-content:center;gap:2px;padding-block:0}
  .site-nav__link{padding:15px 20px;border-bottom:0}
  .site-nav__link::after{left:20px;bottom:8px;width:auto;right:20px}
  .site-nav__link[aria-current="page"]{background:none}
}
@media (max-width:639px){
  :root{--pad:16px}
  .header-utility__inner{padding-block:8px}
  .utility-index{gap:4px 16px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand__desc{max-width:none}
  .to-top{right:14px;bottom:16px;width:42px;height:42px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
}