/* ==========================================================
   天辰品牌站 · 共享样式 /assets/site.css
   轨道仪表盘体系：深空蓝底 + 星轨青行动 + 信号橙提醒
   ========================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --c-ink:#07111F;
  --c-orbit:#0E2238;
  --c-cyan:#5CE1D4;
  --c-signal:#FF7A3D;
  --c-mist:#C9D5E3;
  --c-paper:#F4F1E8;
  --c-black:#0B0F14;
  --c-rail:#2B455F;
  --c-moss:#8CBDB3;
  --c-sand:#D8C7A8;

  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono","Cascadia Mono","Roboto Mono",Menlo,Consolas,monospace;

  --shell:1320px;
  --pad:16px;
  --edge:1px solid var(--c-rail);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}
body{
  margin:0;
  background:var(--c-ink);
  color:var(--c-mist);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,p,ul,ol,figure,dl,dd,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}

/* ---------- 3. 排版与容器 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;line-height:1.12;color:var(--c-paper)}
h1{font-size:clamp(40px,7vw,96px)}
h2{font-size:clamp(28px,3.6vw,44px)}
h3{font-size:clamp(20px,2.2vw,26px);letter-spacing:-.01em}
h4{font-size:clamp(16px,1.6vw,19px);font-weight:800;letter-spacing:0}
strong{color:var(--c-paper);font-weight:700}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}

.wrap{width:min(var(--shell),calc(100% - var(--pad) * 2));margin-inline:auto}

.prose{max-width:72ch;font-size:17px;line-height:1.8;color:var(--c-mist)}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.8em;color:var(--c-paper)}
.prose a{color:var(--c-cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{color:var(--c-paper)}
.prose ul > li{position:relative;padding-left:20px;margin-top:.55em}
.prose ul > li::before{
  content:"";position:absolute;left:0;top:.62em;width:6px;height:6px;
  background:var(--c-cyan);transform:rotate(45deg);
}
.prose ol{list-style:decimal;padding-left:22px}
.prose ol > li{margin-top:.55em}
.prose blockquote{
  border-left:3px solid var(--c-signal);padding:8px 0 8px 18px;
  color:var(--c-paper);font-size:18px;
}

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:120;
  display:inline-block;padding:10px 18px;
  background:var(--c-cyan);color:#04211E;
  font-size:13px;font-weight:700;letter-spacing:.04em;
  border-radius:0 0 2px 2px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 5. 头部 · 轨道命令栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,#0A1728 0%,#07111F 100%);
  border-bottom:var(--edge);
  color:var(--c-mist);
  box-shadow:0 18px 40px -34px rgba(0,0,0,.95);
}
.site-header::after{
  content:"";display:block;height:1px;
  background:linear-gradient(90deg,transparent,rgba(92,225,212,.45),transparent);
}
.site-header__bar{
  display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);
  width:min(var(--shell),calc(100% - var(--pad) * 2));
  margin-inline:auto;
  min-height:64px;
}
.site-header__ticker{
  display:flex;align-items:center;gap:9px;
  width:min(var(--shell),calc(100% - var(--pad) * 2));
  margin-inline:auto;
  padding-bottom:7px;
  font-size:11px;letter-spacing:.09em;
  color:rgba(201,213,227,.6);
  border-top:1px solid rgba(43,69,95,.55);
  padding-top:6px;
}

/* 品牌 */
.brand{
  display:inline-flex;align-items:center;gap:10px;
  flex:0 0 auto;color:var(--c-paper);
}
.brand__mark{
  position:relative;flex:0 0 auto;
  width:14px;height:14px;border-radius:50%;
  border:1px solid var(--c-cyan);
  box-shadow:0 0 0 3px rgba(92,225,212,.12);
}
.brand__mark::after{
  content:"";position:absolute;inset:3px;border-radius:50%;background:var(--c-cyan);
}
.brand__text{display:block;line-height:1.15}
.brand__name{display:block;font-size:15px;font-weight:800;letter-spacing:.02em}
.brand__desc{
  display:block;margin-top:3px;
  font-size:10px;letter-spacing:.13em;font-weight:400;
  color:rgba(201,213,227,.58);
}
.brand--footer{align-items:flex-start}
.brand--footer .brand__name{font-size:17px}
.brand--footer .brand__desc{margin-top:4px}

/* 主导航 */
.site-nav{margin-inline:auto}
.site-nav__list{display:flex;align-items:center;gap:2px;counter-reset:navidx}
.site-nav__link{
  position:relative;
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 10px;
  font-size:13px;font-weight:500;letter-spacing:.04em;
  color:rgba(201,213,227,.76);
  border-bottom:1px solid transparent;
  border-radius:2px;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.site-nav__link::before{
  counter-increment:navidx;
  content:"0" counter(navidx);
  font-family:var(--font-mono);
  font-size:9px;letter-spacing:.08em;
  color:rgba(92,225,212,.5);
  transition:color .18s var(--ease);
}
.site-nav__link:hover{
  color:var(--c-paper);
  background:rgba(92,225,212,.09);
  border-bottom-color:rgba(92,225,212,.4);
}
.site-nav__link[aria-current="page"]{
  color:var(--c-cyan);
  background:rgba(14,34,56,.92);
  border-bottom-color:var(--c-cyan);
}
.site-nav__link[aria-current="page"]::before{color:var(--c-signal)}

/* 头部动作区 */
.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto;margin-left:auto}
.header-actions .btn{white-space:nowrap}

/* 状态带 */
.header-status__dot{
  flex:0 0 auto;width:6px;height:6px;border-radius:50%;
  background:var(--c-cyan);box-shadow:0 0 0 4px rgba(92,225,212,.14);
}
.header-status__text{
  flex:1 1 auto;min-width:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.header-status__meta{
  flex:0 0 auto;margin-left:auto;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:rgba(92,225,212,.55);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  flex:0 0 auto;margin-left:auto;
  padding:8px 10px;
  background:transparent;
  border:1px solid var(--c-rail);border-radius:2px;
  color:var(--c-mist);
  font-size:11px;letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:14px}
.nav-toggle__bars span{
  display:block;height:1.5px;width:100%;
  background:var(--c-cyan);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){transform:translateY(-2.75px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

/* ---------- 6. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 16px;
  font-size:13px;font-weight:600;letter-spacing:.04em;line-height:1;
  border:1px solid transparent;border-radius:2px;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:transform .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--c-cyan);color:#04211E;border-color:var(--c-cyan)}
.btn--primary:hover{background:#7BEDE2;border-color:#7BEDE2;box-shadow:0 8px 22px -12px rgba(92,225,212,.9)}
.btn--ghost{background:transparent;color:var(--c-mist);border-color:var(--c-rail)}
.btn--ghost:hover{color:var(--c-cyan);border-color:var(--c-cyan);background:rgba(92,225,212,.08)}
.btn--signal{background:var(--c-signal);color:#2A0D02;border-color:var(--c-signal)}
.btn--signal:hover{background:#FF9361;border-color:#FF9361}

/* ---------- 7. 标签 / 印章 / 说明牌 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-size:11px;letter-spacing:.1em;font-weight:600;line-height:1.5;
  color:var(--c-mist);
  background:rgba(14,34,56,.82);
  border:1px solid var(--c-rail);
  border-radius:999px;
}
.tag--cyan{background:var(--c-cyan);border-color:var(--c-cyan);color:#04211E}
.tag--signal{background:var(--c-signal);border-color:var(--c-signal);color:#2A0D02}
.tag--sand{background:var(--c-sand);border-color:var(--c-sand);color:#2A2417}
.tag--moss{background:var(--c-moss);border-color:var(--c-moss);color:#0C2420}

.plate{
  display:inline-flex;flex-direction:column;gap:2px;
  padding:6px 10px;
  border:1px solid var(--c-rail);border-left:3px solid var(--c-cyan);
  background:rgba(14,34,56,.86);
  border-radius:1px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.08em;
  color:var(--c-mist);
}
.plate__label{color:rgba(201,213,227,.55);font-size:10px;letter-spacing:.14em}
.plate__value{color:var(--c-cyan);font-size:13px;font-variant-numeric:tabular-nums}

/* ---------- 8. 章节与卡片 ---------- */
.section{padding-block:clamp(44px,6.5vw,96px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;
  padding-bottom:16px;margin-bottom:clamp(22px,3vw,38px);
  border-bottom:var(--edge);
}
.section__index{
  display:block;margin-bottom:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  color:var(--c-cyan);font-variant-numeric:tabular-nums;
}
.section__title{font-size:clamp(26px,3.4vw,40px);font-weight:900;letter-spacing:-.02em;color:var(--c-paper);line-height:1.1}
.section__lede{max-width:62ch;font-size:16px;line-height:1.75;color:rgba(201,213,227,.82)}

.card{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  background:var(--c-orbit);
  border:var(--edge);border-radius:2px;
  box-shadow:8px 8px 0 -1px rgba(43,69,95,.32);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover,
.card:focus-within{
  transform:translateY(-4px);
  border-color:var(--c-cyan);
  box-shadow:8px 12px 0 -1px rgba(92,225,212,.2);
}
.card--paper{background:var(--c-paper);color:var(--c-black);border-color:#DCD5C5;box-shadow:8px 8px 0 -1px rgba(216,199,168,.55)}
.card--paper h2,.card--paper h3,.card--paper h4{color:var(--c-black)}
.panel{
  padding:clamp(18px,2.4vw,28px);
  background:rgba(14,34,56,.62);
  border:var(--edge);border-radius:2px;
}

/* ---------- 9. 网格 ---------- */
.grid{display:grid;gap:clamp(14px,2vw,26px)}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--split-rev{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--mosaic{grid-template-columns:repeat(12,minmax(0,1fr))}

/* ---------- 10. 面包屑 ---------- */
.breadcrumbs{margin-bottom:20px;font-size:12px;letter-spacing:.06em}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:0;color:rgba(201,213,227,.58)}
.breadcrumbs li + li::before{content:"/";margin:0 8px;color:var(--c-rail)}
.crumb{color:inherit;transition:color .16s var(--ease)}
.crumb:hover{color:var(--c-cyan)}
.crumb[aria-current="page"]{color:var(--c-paper)}

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  width:100%;
  aspect-ratio:16/9;
  border:var(--edge);border-radius:2px;
  background:
    radial-gradient(120% 120% at 18% 8%,#12293F 0%,#07111F 72%),
    linear-gradient(135deg,rgba(92,225,212,.1),transparent 58%);
}
.media-frame::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(to right,rgba(43,69,95,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(43,69,95,.55) 1px,transparent 1px);
  background-size:44px 44px;
}
.media-frame__img{position:relative;width:100%;height:100%;object-fit:cover}
.media-frame__caption{
  position:absolute;left:0;bottom:0;right:0;
  padding:8px 12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--c-mist);
  background:linear-gradient(180deg,transparent,rgba(7,17,31,.92));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 12. 滚动进度与返回顶部 ---------- */
.scroll-meter{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:90;
  pointer-events:none;background:transparent;
}
.scroll-meter__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-moss) 55%,var(--c-signal));
}
.to-top{
  position:fixed;right:clamp(12px,2vw,24px);bottom:clamp(12px,2vw,24px);z-index:80;
  width:44px;height:44px;
  display:grid;place-items:center;
  background:var(--c-orbit);color:var(--c-cyan);
  border:1px solid var(--c-cyan);border-radius:2px;
  font-size:16px;line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s,background .2s var(--ease),color .2s var(--ease);
}
.to-top.is-on{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--c-cyan);color:#04211E}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 300px at 84% -12%,rgba(92,225,212,.14),transparent 62%),
    linear-gradient(180deg,#07111F 0%,#0E2238 100%);
  color:var(--c-mist);
  border-top:var(--edge);
}
.site-footer::before{
  content:"";position:absolute;
  right:-140px;bottom:-220px;width:520px;height:520px;
  border-radius:50%;
  border:1px solid rgba(92,225,212,.18);
  box-shadow:0 0 0 44px rgba(92,225,212,.035),0 0 0 96px rgba(92,225,212,.02);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  display:grid;
  grid-template-columns:minmax(240px,1.3fr) minmax(0,2fr) minmax(240px,1.05fr);
  gap:clamp(24px,3.6vw,56px);
  padding-block:clamp(40px,5.5vw,72px);
}
.footer-brand .brand{margin-bottom:16px}
.footer-intro{
  max-width:40ch;font-size:14px;line-height:1.8;
  color:rgba(201,213,227,.76);
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.2vw,32px);
}
.footer-col__title{
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:11px;font-weight:600;letter-spacing:.18em;
  color:rgba(92,225,212,.7);
}
.footer-col__list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-block;padding:5px 0;
  font-size:14px;color:rgba(201,213,227,.82);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-link:hover{color:var(--c-cyan);border-bottom-color:var(--c-cyan)}

.footer-contact{display:flex;flex-direction:column;gap:8px}
.footer-contact__title{
  margin-bottom:4px;
  font-family:var(--font-mono);
  font-size:11px;font-weight:600;letter-spacing:.18em;
  color:rgba(92,225,212,.7);
}
.contact-line{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;
  color:var(--c-paper);
  font-variant-numeric:tabular-nums;
  transition:color .16s var(--ease);
  word-break:break-word;
}
a.contact-line:hover{color:var(--c-cyan)}
.contact-line--plain{color:rgba(201,213,227,.72);font-family:var(--font-body);font-size:13px;line-height:1.7}
.footer-note{
  margin-top:6px;
  padding-top:12px;
  border-top:1px solid rgba(43,69,95,.7);
  font-size:12px;line-height:1.75;color:rgba(201,213,227,.58);
}
.footer-base{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;
  padding-block:16px 22px;
  border-top:1px solid rgba(43,69,95,.75);
}
.footer-legal{font-size:12px;letter-spacing:.04em;color:rgba(201,213,227,.66)}
.footer-utility{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:rgba(92,225,212,.55);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .header-actions .btn--ghost{display:none}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    margin:0;
    padding:10px calc(var(--pad) + 4px) 18px;
    background:#0A1728;
    border-top:1px solid rgba(43,69,95,.6);
    border-bottom:var(--edge);
    box-shadow:0 28px 46px -30px rgba(0,0,0,.95);
  }
  .site-header[data-open] .site-nav{display:block}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{
    padding:14px 10px;
    font-size:14px;
    border-radius:0;
    border-bottom:1px solid rgba(43,69,95,.55);
    border-left:2px solid transparent;
  }
  .site-nav__link:hover{background:rgba(92,225,212,.07);border-bottom-color:rgba(43,69,95,.55);border-left-color:rgba(92,225,212,.5)}
  .site-nav__link[aria-current="page"]{
    background:rgba(92,225,212,.08);
    border-bottom-color:rgba(43,69,95,.55);
    border-left-color:var(--c-cyan);
  }
  .site-nav__list > li:last-child .site-nav__link{border-bottom:0}
}

@media (max-width:960px){
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
  .grid--split,
  .grid--split-rev{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:720px){
  :root{--pad:14px}
  .site-header__bar{min-height:58px;gap:10px}
  .brand__desc{display:none}
  .header-actions .btn{padding:9px 12px;font-size:12px}
  .site-header__ticker{display:none}
  .footer-inner{grid-template-columns:1fr;gap:28px}
  .footer-nav{grid-template-columns:1fr 1fr}
  .footer-base{flex-direction:column;align-items:flex-start;gap:6px}
  .to-top{width:40px;height:40px}
}

@media (max-width:460px){
  .brand__name{font-size:14px}
  .header-actions .btn{display:none}
  .nav-toggle{margin-left:auto}
  .footer-nav{grid-template-columns:1fr}
  .section__head{flex-direction:column;align-items:flex-start}
}

/* ---------- 15. 减少动态偏好 ---------- */
@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;
  }
  .card:hover,.card:focus-within{transform:none}
  .btn:hover{transform:none}
  .to-top{transform:none}
}