:root{
  --night:#0B1A2B;
  --cabin:#10263A;
  --snow-deep:#17405C;
  --snow:#2F6E8C;
  --snow-light:#6FA8BF;
  --sand:#D8C6A6;
  --paper:#F2EADF;
  --paper-2:#FAF4EA;
  --neon:#B6FF3C;
  --amber:#FFB020;
  --slate:#7C8B94;
  --rail:72px;
  --wrap:1180px;
  --line-dark:rgba(111,168,191,.18);
  --line-ink:rgba(23,64,92,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{
  margin:0;background:var(--paper);color:var(--night);
  font-family:var(--font-body);font-size:17px;line-height:1.8;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
time{font-variant-numeric:tabular-nums}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px}
main{display:block}

/* ============ 排版 ============ */
.h1,h1{font-family:var(--font-display);font-weight:800;font-size:clamp(34px,5.2vw,56px);line-height:1.16;letter-spacing:-.02em}
.h2,h2{font-family:var(--font-display);font-weight:800;font-size:clamp(26px,3.4vw,34px);line-height:1.28;letter-spacing:-.02em}
.h3,h3{font-family:var(--font-display);font-weight:700;font-size:22px;line-height:1.4;letter-spacing:-.01em}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--slate)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.78;color:var(--snow-deep);max-width:44ch}
.prose{max-width:40rem}
.prose p{font-size:16.5px;line-height:1.85;color:var(--snow-deep)}
.prose p+p{margin-top:1em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.score{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:600;font-size:1.4em;letter-spacing:-.02em;color:var(--amber)}
.muted{color:var(--slate)}
.ink{color:var(--snow-deep)}
.on-dark{color:var(--paper)}
.on-dark .muted,.on-dark .prose p,.section--dark .lede,.section--cabin .lede{color:var(--snow-light)}
.chapter-num{
  position:absolute;font-family:var(--font-mono);font-size:88px;line-height:.9;font-weight:500;
  color:rgba(47,110,140,.18);pointer-events:none;user-select:none;letter-spacing:-.04em;
}

/* ============ 容器与网格 ============ */
.wrap{width:min(var(--wrap),100% - 40px);margin-inline:auto}
.wrap--narrow{width:min(760px,100% - 40px);margin-inline:auto}
.section{padding-block:clamp(64px,9vw,140px)}
.section--tight{padding-block:clamp(40px,5vw,72px)}
.section--dark{background:var(--night);color:var(--paper)}
.section--cabin{background:var(--cabin);color:var(--paper)}
.section--sand{background:var(--sand);color:var(--night)}
.section--paper{background:var(--paper);color:var(--night)}
.grid{display:grid;gap:clamp(20px,3vw,36px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--uneven{grid-template-columns:1.6fr 1fr}
@media (max-width:860px){
  .grid--2,.grid--3,.grid--uneven{grid-template-columns:1fr}
}

/* ============ 显现动效 ============ */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-display);font-weight:700;font-size:14px;letter-spacing:.06em;
  padding:11px 20px;border:1px solid transparent;border-radius:2px;white-space:nowrap;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn--sm{font-size:12.5px;padding:7px 14px;letter-spacing:.08em}
.btn--neon{background:var(--neon);color:#08131f}
.btn--neon:hover{background:#cbfa72}
.btn--solid{background:var(--snow);color:var(--paper)}
.btn--solid:hover{background:var(--snow-deep)}
.btn--line{border-color:rgba(111,168,191,.5);color:var(--snow-light);background:transparent}
.btn--line:hover{border-color:var(--neon);color:var(--paper)}
.btn--ink{border-color:rgba(23,64,92,.3);color:var(--snow-deep);background:transparent}
.btn--ink:hover{border-color:var(--snow);color:var(--snow)}

/* ============ 标签 / 圆点 / 卡片 ============ */
.tag{
  display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.12em;padding:4px 10px;border:1px solid var(--line-ink);border-radius:999px;
  color:var(--slate);white-space:nowrap;
}
.tag--neon{background:var(--neon);border-color:var(--neon);color:#08131f}
.tag--amber{color:var(--amber);border-color:rgba(255,176,32,.45)}
.tag--snow{color:var(--snow);border-color:rgba(47,110,140,.4)}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--neon);flex:none}

.card{
  position:relative;display:block;background:var(--paper-2);color:var(--night);
  border:1px solid var(--line-ink);border-radius:3px;padding:clamp(18px,2.2vw,26px);
  box-shadow:0 1px 0 rgba(11,26,43,.04);
  transition:transform .28s var(--ease),border-color .28s var(--ease),box-shadow .28s var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:rgba(23,64,92,.42);box-shadow:0 6px 18px rgba(11,26,43,.08)}
.card--dark{background:var(--cabin);color:var(--paper);border-color:rgba(111,168,191,.22)}
.card--dark:hover{border-color:rgba(182,255,60,.5)}
.card__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--slate);margin-bottom:10px}
.card--dark .card__meta{color:var(--snow-light)}
.card__title{font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.4;letter-spacing:-.01em;margin-bottom:8px}
.card__text{font-size:14.5px;line-height:1.85;color:var(--snow-deep)}
.card--dark .card__text{color:var(--snow-light)}

/* ============ 横向主题带 ============ */
.section-band{
  position:relative;display:grid;grid-template-columns:auto 1fr;gap:4px 22px;align-items:baseline;
  padding-top:26px;margin-bottom:clamp(28px,4vw,48px);
}
.section-band::before{
  content:"";position:absolute;left:0;top:0;width:100%;height:1px;background:currentColor;opacity:.28;
  transform:scaleX(0);transform-origin:0 50%;transition:transform .42s ease-out;
}
.section-band.is-visible::before{transform:scaleX(1)}
.section-band__num{font-family:var(--font-mono);font-size:34px;line-height:1;color:var(--snow);letter-spacing:-.04em}
.section--dark .section-band__num,.section--cabin .section-band__num{color:var(--snow-light)}
.section-band__title{font-family:var(--font-display);font-weight:800;font-size:clamp(22px,2.8vw,34px);line-height:1.3;letter-spacing:-.02em}
.section-band__note{grid-column:2;font-size:13.5px;line-height:1.8;color:var(--slate);max-width:44ch}
.section--dark .section-band__note,.section--cabin .section-band__note{color:var(--snow-light)}

/* ============ 面包屑 ============ */
.crumbs{font-size:13px;color:var(--slate);margin-bottom:22px}
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px 0;align-items:center}
.crumbs li{display:flex;align-items:center}
.crumbs li+li::before{content:"/";margin:0 10px;color:rgba(124,139,148,.55)}
.crumbs a{border-bottom:1px solid transparent;transition:border-color .2s var(--ease),color .2s var(--ease)}
.crumbs a:hover{color:var(--snow-deep);border-bottom-color:currentColor}
.crumbs [aria-current="page"]{color:var(--snow-deep)}

/* ============ 图片容器 ============ */
.media{position:relative;display:block;overflow:hidden;margin:0;border-radius:3px;background:var(--night);aspect-ratio:16/9}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media>img{width:100%;height:100%;object-fit:cover}
.media__scene{
  position:absolute;inset:0;
  background:
    radial-gradient(120% 80% at 78% 0%,rgba(182,255,60,.10),transparent 62%),
    linear-gradient(180deg,#0B1A2B 0%,#10263A 58%,#17405C 100%);
}
.media__scene::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(111,168,191,.12) 1px,transparent 1px),
    linear-gradient(90deg,rgba(111,168,191,.12) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
}
.media__scene::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:56%;
  background:linear-gradient(180deg,rgba(47,110,140,.42),rgba(11,26,43,.96));
  clip-path:polygon(0 66%,10% 44%,22% 62%,34% 26%,48% 58%,62% 36%,76% 64%,88% 46%,100% 70%,100% 100%,0 100%);
}
.media__caption{
  position:absolute;left:16px;bottom:13px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--snow-light);
}

/* ============ 主题筛选 ============ */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:14px 0;margin-bottom:clamp(20px,3vw,32px);
  border-top:1px solid var(--line-ink);border-bottom:1px solid var(--line-ink);
}
.section--dark .filter-bar,.section--cabin .filter-bar{border-color:var(--line-dark)}
.filter-btn{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;padding:7px 14px;
  border:1px solid var(--line-ink);border-radius:999px;color:var(--snow-deep);background:transparent;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.section--dark .filter-btn,.section--cabin .filter-btn{border-color:var(--line-dark);color:var(--snow-light)}
.filter-btn:hover{border-color:var(--snow)}
.filter-btn[aria-pressed="true"]{background:var(--neon);border-color:var(--neon);color:#08131f}
.filter-count{font-family:var(--font-mono);font-size:12px;color:var(--slate);margin-left:auto;letter-spacing:.06em}
.filter-reset{font-size:12px;color:var(--snow-deep);border-bottom:1px solid currentColor;padding:0}
.filter-reset[hidden]{display:none}
.is-filtered-out{display:none !important}

/* ============ 跳过链接 ============ */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:300;
  background:var(--neon);color:#08131f;font-weight:700;font-size:14px;
  padding:10px 18px;border-radius:0 0 3px 0;
}
.skip-link:focus{left:0}

/* ============ 页头 ============ */
.site-header{
  position:sticky;top:0;z-index:90;color:var(--paper);
  background:rgba(11,26,43,.94);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.toolbar{
  width:min(var(--wrap),100% - 40px);margin-inline:auto;
  display:flex;align-items:center;gap:18px;padding:14px 0;
  transition:padding .3s var(--ease);
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand__mark{
  position:relative;width:22px;height:22px;flex:none;
  background:linear-gradient(135deg,var(--snow),var(--snow-deep));
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
}
.brand__mark::after{content:"";position:absolute;inset:7px;border-radius:50%;background:var(--neon)}
.brand__text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:16px;letter-spacing:.16em;color:var(--paper)}
.brand__sub{
  font-size:11px;letter-spacing:.2em;color:var(--snow-light);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.toolbar__clock{
  display:flex;align-items:baseline;gap:8px;margin-left:4px;padding-left:16px;
  border-left:1px solid var(--line-dark);font-size:12px;color:var(--snow-light);letter-spacing:.1em;
}
.toolbar__clock-label{font-size:11.5px}
.toolbar__clock-time{font-family:var(--font-mono);font-size:14px;letter-spacing:.06em;color:var(--paper)}
.toolbar__clock-zone{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;color:var(--slate)}
.toolbar__actions{display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;padding:9px 12px;
  border:1px solid var(--line-dark);border-radius:2px;color:var(--snow-light);
  font-size:12px;letter-spacing:.14em;
}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background-color .2s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform .26s var(--ease),top .26s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.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__label{white-space:nowrap}
.progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  background:linear-gradient(90deg,var(--snow),var(--neon));
  transform:scaleX(0);transform-origin:0 50%;
}
.site-header.is-condensed .toolbar{padding:8px 0}
.site-header.is-condensed .brand__sub,
.site-header.is-condensed .toolbar__clock,
.site-header.is-condensed .toolbar-action--minor{display:none}

/* ============ 轨道导航（移动端 = 抽屉） ============ */
.site-nav{
  position:fixed;top:0;left:0;bottom:0;z-index:88;
  width:min(320px,84vw);display:flex;flex-direction:column;gap:4px;
  padding:78px 22px 26px;
  background:linear-gradient(180deg,#0B1A2B 0%,#08131f 100%);
  border-right:1px solid var(--line-dark);color:var(--paper);
  overflow-y:auto;transform:translateX(-102%);
  transition:transform .26s var(--ease);
}
[data-nav][data-open]{transform:translateX(0)}
body.nav-open{overflow:hidden}
.nav-sign{display:flex;align-items:baseline;gap:12px;margin-bottom:20px}
.nav-sign__mark{font-family:var(--font-mono);font-size:11px;letter-spacing:.34em;color:var(--neon)}
.nav-sign__zh{font-family:var(--font-display);font-weight:800;font-size:14px;letter-spacing:.24em;color:var(--paper)}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{width:100%;min-width:0}
.nav-link{
  position:relative;display:flex;align-items:center;gap:14px;padding:14px;
  color:var(--snow-light);font-size:15px;letter-spacing:.08em;border-radius:2px;
  transition:color .24s var(--ease),background-color .24s var(--ease);
}
.nav-link::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:2px;background:transparent;
  transform:scaleY(.5);transition:transform .3s var(--ease),background-color .3s var(--ease);
}
.nav-link:hover{color:var(--paper)}
.nav-link[aria-current="page"]{color:var(--paper);background:rgba(47,110,140,.18)}
.nav-link[aria-current="page"]::before{background:var(--snow);transform:scaleY(1)}
.nav-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;color:rgba(111,168,191,.75);width:20px;flex:none}
.nav-text{white-space:nowrap}
.nav-cta{
  margin-top:auto;display:flex;align-items:center;justify-content:center;
  padding:13px 14px;background:var(--neon);color:#08131f;border-radius:2px;
  font-family:var(--font-display);font-weight:700;font-size:14px;letter-spacing:.16em;
}

@media (max-width:760px){
  .brand__sub{display:none}
  .toolbar__clock-zone{display:none}
}
@media (max-width:640px){
  .toolbar-action--minor{display:none}
}
@media (max-width:560px){
  .toolbar__clock{display:none}
  .toolbar{gap:12px}
}

/* ============ 桌面轨道 ============ */
@media (min-width:900px){
  body{padding-left:var(--rail)}
  .site-nav{
    position:fixed;inset:0 auto 0 0;width:var(--rail);
    transform:none;transition:none;overflow:visible;
    align-items:center;padding:16px 0 20px;gap:0;z-index:95;
    background:linear-gradient(180deg,#0B1A2B 0%,#081624 52%,#0B1A2B 100%);
    border-right:1px solid var(--line-dark);
  }
  [data-nav][data-open]{transform:none}
  .nav-sign{flex-direction:column;align-items:center;gap:10px;margin-bottom:16px}
  .nav-sign__zh{writing-mode:vertical-rl;font-size:12.5px;letter-spacing:.34em}
  .nav-sign__mark{letter-spacing:.2em}
  .nav-list{
    flex:1 1 auto;width:100%;gap:2px;padding-bottom:10px;
    overflow-y:auto;overflow-x:hidden;scrollbar-width:none;
  }
  .nav-list::-webkit-scrollbar{width:0;height:0}
  .nav-link{flex-direction:column;gap:8px;padding:14px 4px;font-size:12px;border-radius:0}
  .nav-link::before{top:12px;bottom:12px}
  .nav-link:hover{background:rgba(47,110,140,.1)}
  .nav-num{width:auto;font-size:9.5px}
  .nav-text{writing-mode:vertical-rl;letter-spacing:.3em}
  .nav-cta{
    writing-mode:vertical-rl;letter-spacing:.24em;font-size:12.5px;
    padding:20px 9px;margin-top:12px;
  }
  .nav-toggle{display:none}
  body.nav-open{overflow:auto}
}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:clamp(64px,9vw,140px);
  padding:clamp(48px,7vw,88px) 0 28px;
  background:linear-gradient(180deg,#E9DECB 0%,var(--paper) 36%);
  color:var(--night);
  border-top:1px solid rgba(23,64,92,.18);
}
.footer-inner{width:min(var(--wrap),100% - 40px);margin-inline:auto}
.footer-top{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;
  gap:clamp(24px,4vw,56px);padding-bottom:36px;border-bottom:1px solid var(--line-ink);
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--slate);padding-bottom:12px;margin-bottom:16px;border-bottom:1px solid var(--line-ink);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a{font-size:14.5px;color:var(--snow-deep);transition:color .2s var(--ease)}
.footer-list a:hover{color:var(--snow)}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand__mark{
  width:20px;height:20px;flex:none;
  background:linear-gradient(135deg,var(--snow),var(--snow-deep));
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
}
.footer-brand__name{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.14em}
.footer-brand__note{font-size:13.5px;line-height:1.85;color:var(--slate);max-width:32ch}
.footer-seal{
  display:inline-block;margin-top:14px;padding:5px 10px;border:1px solid var(--line-ink);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--snow-deep);
}
.footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact__item{display:flex;flex-direction:column;gap:2px}
.footer-contact__key{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--slate)}
.footer-contact__val{font-size:13.5px;line-height:1.7;color:var(--snow-deep);word-break:break-word}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line-ink)}
.footer-links a{font-size:13px;color:var(--slate);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.footer-links a:hover{color:var(--snow);border-bottom-color:currentColor}
.footer-base{
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 24px;
  padding-top:20px;font-size:12.5px;color:var(--slate);
}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px}
.footer-fine{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em}
@media (max-width:960px){
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .footer-col--brand{grid-column:1 / -1}
}
@media (max-width:560px){
  .footer-top{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
  .section-band::before{transform:scaleX(1)}
}