/* ==========================================================================
   诺亚赛场 · 共享样式表 /assets/site.css
   骨架：草原夜蓝底 + 雾蓝细导线 + 信号黄数据点
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}

/* ---------- 2. Tokens ---------- */
:root{
  --ink-900:#0A1826;
  --ink-800:#12293D;
  --line-600:#2B4A63;
  --paper:#F3F0E7;
  --muted:#9FB2C2;
  --yellow:#F7C948;
  --yellow-bright:#FFD75E;
  --red:#E24B3F;
  --green:#35A06B;
  --amber:#8A5A12;
  --glass:rgba(255,255,255,.08);

  --font-display:"Oswald","DIN Condensed","Bebas Neue","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"IBM Plex Mono","SFMono-Regular","JetBrains Mono",Consolas,"Liberation Mono",monospace;

  --shell:1280px;
  --gap:clamp(16px,2.2vw,28px);
  --dur:.32s;
  --ease:cubic-bezier(.2,.7,.2,1);
}

:focus-visible{outline:2px solid var(--yellow);outline-offset:3px;border-radius:2px}
::selection{background:var(--yellow);color:var(--ink-900)}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(70vw 55vh at 92% -12%, rgba(247,201,72,.10), transparent 66%),
    radial-gradient(52vw 46vh at -8% 104%, rgba(53,160,107,.09), transparent 68%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:900;
  font-stretch:condensed;
  line-height:1.14;
  letter-spacing:-.02em;
  color:var(--paper);
}
h1{font-size:clamp(2.2rem,5vw,4.6rem)}
h2{font-size:clamp(1.5rem,2.8vw,2.4rem)}
h3{font-size:clamp(1.12rem,1.7vw,1.45rem);letter-spacing:0;line-height:1.35}
h4{font-size:1rem;letter-spacing:.02em;line-height:1.4}

p{max-width:60ch}
strong{font-weight:600;color:var(--paper)}
small{font-size:12px;letter-spacing:.14em;color:var(--muted)}

.mono{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.lead{font-size:clamp(1rem,1.3vw,1.12rem);line-height:1.8;color:var(--muted);max-width:38em}
.prose{max-width:38em}
.prose p + p{margin-top:1em}
.prose a{color:var(--yellow);border-bottom:1px solid rgba(247,201,72,.4)}
.prose a:hover{border-bottom-color:var(--yellow)}
.prose ul{list-style:none;padding:0}
.prose ul li{position:relative;padding-left:18px;margin-top:.5em}
.prose ul li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:2px;background:var(--yellow)}

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

/* ---------- 4. 布局骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(16px,4vw,40px);
}

.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(26px,4vw,48px)}

.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--aside{grid-template-columns:minmax(0,180px) minmax(0,1fr);gap:clamp(20px,3vw,44px)}

.rule{
  height:1px;width:100%;border:0;
  background:linear-gradient(90deg,var(--line-600),rgba(43,74,99,.18));
}

.stack > * + *{margin-top:var(--gap)}

/* ---------- 5. 文本标记件 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-num);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--muted);
}

.vlabel{
  writing-mode:vertical-rl;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--muted);
  border-left:1px solid var(--line-600);
  padding-left:10px;
}

.section-num{
  display:block;
  font-family:var(--font-display);
  font-weight:900;
  font-stretch:condensed;
  font-size:clamp(2.6rem,6vw,5rem);
  line-height:.86;
  letter-spacing:-.03em;
  color:transparent;
  -webkit-text-stroke:1.5px var(--yellow);
}
@supports not (-webkit-text-stroke:1px #000){
  .section-num{color:var(--yellow)}
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  line-height:1.4;
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--yellow);color:var(--ink-900);border-color:var(--yellow)}
.btn--primary:hover{background:var(--yellow-bright);border-color:var(--yellow-bright)}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--line-600)}
.btn--ghost:hover{border-color:var(--yellow);color:var(--yellow)}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:20px 0;
  font-family:var(--font-num);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.breadcrumb a{color:var(--muted);transition:color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--yellow)}
.breadcrumb__sep{color:var(--line-600)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 8. 基础组件 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--ink-800);
  border:1px solid var(--line-600);
  border-radius:3px;
}
.card--glass{
  background:var(--glass);
  border-color:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(14px) saturate(1.15);
  backdrop-filter:blur(14px) saturate(1.15);
  box-shadow:0 22px 48px -28px rgba(0,0,0,.95);
}
.card__title{margin-bottom:8px}
.card p{color:var(--muted)}

.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-num);
  font-weight:600;
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.6rem,3.2vw,2.4rem);
  line-height:1.1;
  color:var(--yellow);
  letter-spacing:-.01em;
}
.stat__label{
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--muted);
}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line-600);
  border-radius:999px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--muted);
  white-space:nowrap;
}
.chip--yellow{color:var(--yellow);border-color:rgba(247,201,72,.45);background:rgba(247,201,72,.08)}
.chip--red{color:#FF9086;border-color:rgba(226,75,63,.5);background:rgba(226,75,63,.14)}
.chip--green{color:#7FD4A9;border-color:rgba(53,160,107,.5);background:rgba(53,160,107,.12)}

/* 图片容器基础规则（页面阶段放入 img / picture / svg） */
.figure{display:grid;gap:10px;margin:0}
.figure__frame{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  border:1px solid var(--line-600);
  border-radius:2px;
  background:
    linear-gradient(135deg,rgba(43,74,99,.55),rgba(18,41,61,.95)),
    var(--ink-800);
}
.figure__frame img,
.figure__frame picture,
.figure__frame svg{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.figure__frame::after{
  content:"";
  position:absolute;inset:0;
  pointer-events:none;
  background:linear-gradient(to top,rgba(10,24,38,.6),transparent 58%);
}
.figure__cap{
  font-size:12px;
  line-height:1.6;
  letter-spacing:.06em;
  color:var(--muted);
}
.figure--wide .figure__frame{aspect-ratio:21/9}
.figure--tall .figure__frame{aspect-ratio:4/5}
.figure--square .figure__frame{aspect-ratio:1/1}

/* 入场动效协议 */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 9. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:200;
  padding:10px 16px;
  border-radius:2px;
  background:var(--yellow);
  color:var(--ink-900);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 10. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(10,24,38,.9);
  -webkit-backdrop-filter:blur(14px) saturate(1.1);
  backdrop-filter:blur(14px) saturate(1.1);
  border-bottom:1px solid var(--line-600);
}

.header-inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:56px;
  padding-block:6px;
}

/* 品牌 */
.brand{
  order:1;
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:4px 2px;
}
.brand__mark{
  position:relative;
  width:26px;
  height:26px;
  flex:none;
  border:2px solid var(--yellow);
  border-radius:2px;
}
.brand__mark::after{
  content:"";
  position:absolute;
  top:4px;bottom:4px;left:50%;
  width:2px;
  transform:translateX(-1px);
  background:var(--green);
}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-stretch:condensed;
  font-size:16px;
  letter-spacing:.02em;
  color:var(--paper);
}
.brand__sub{
  margin-top:3px;
  font-size:9.5px;
  letter-spacing:.22em;
  color:var(--muted);
}

/* 导航 */
.site-nav{
  order:2;
  flex:1 1 auto;
  display:flex;
  align-items:center;
  gap:16px;
  min-width:0;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  flex-wrap:nowrap;
}
.site-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:9px 10px;
  border-bottom:2px solid transparent;
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--muted);
  white-space:nowrap;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--paper)}
.site-nav__idx{
  font-family:var(--font-num);
  font-size:10px;
  letter-spacing:.04em;
  color:rgba(159,178,194,.55);
  transition:color var(--dur) var(--ease);
}
.site-nav__link[aria-current="page"]{
  color:var(--paper);
  border-bottom-color:var(--yellow);
}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--yellow)}

/* 移动端附加块（桌面隐藏） */
.nav-extras{display:none}

/* 头部右侧工具区 */
.header-rail{
  order:3;
  display:flex;
  align-items:center;
  gap:14px;
  flex:0 0 auto;
}

.status-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 11px;
  border:1px solid var(--line-600);
  border-radius:999px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.07em;
  color:var(--muted);
  white-space:nowrap;
}
.status-pill__dot{
  width:6px;
  height:6px;
  flex:none;
  border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 3px rgba(53,160,107,.22);
}

.rail-link{
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--muted);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.rail-link:hover{color:var(--yellow);border-bottom-color:rgba(247,201,72,.5)}

.rail-cta{white-space:nowrap}

/* 移动端开关按钮 */
.nav-toggle{
  order:4;
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:8px 11px;
  border:1px solid var(--line-600);
  border-radius:2px;
  color:var(--paper);
  font-size:11.5px;
  letter-spacing:.18em;
  transition:border-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--yellow)}
.nav-toggle[aria-expanded="true"]{border-color:var(--yellow)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--yellow);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 滚动进度条 */
.read-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.read-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--green),var(--yellow));
  transition:width .12s linear;
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(40px,7vw,88px);
  background:var(--ink-800);
  border-top:1px solid var(--line-600);
  color:var(--muted);
  padding-top:clamp(38px,5.5vw,68px);
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,300px) minmax(0,1fr);
  gap:clamp(28px,5vw,64px);
  padding-bottom:clamp(28px,4vw,40px);
  border-bottom:1px solid rgba(43,74,99,.65);
}

.footer-brand{display:flex;flex-direction:column;gap:16px;align-items:flex-start}
.footer-summary{
  max-width:32ch;
  font-size:14px;
  line-height:1.8;
  color:var(--muted);
}
.footer-stamp{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(159,178,194,.8);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,32px);
}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-num);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--paper);
}
.footer-col__title::before{
  content:"";
  display:block;
  width:16px;
  height:2px;
  margin-bottom:10px;
  background:var(--yellow);
}
.footer-col__list{display:grid;gap:9px;font-size:14px;line-height:1.5}
.footer-col__list a{
  color:var(--muted);
  transition:color var(--dur) var(--ease);
}
.footer-col__list a:hover{color:var(--yellow)}

.footer-contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:8px 36px;
  padding-block:22px;
  border-bottom:1px solid rgba(43,74,99,.65);
  font-size:13px;
  line-height:1.72;
  color:var(--muted);
}
.footer-contact__line{margin:0;max-width:none}
.footer-contact__key{
  display:inline-block;
  min-width:74px;
  margin-right:10px;
  color:var(--paper);
  font-weight:500;
  letter-spacing:.06em;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 28px;
  padding-block:20px 28px;
  font-family:var(--font-num);
  font-size:11.5px;
  letter-spacing:.06em;
  color:rgba(159,178,194,.72);
}
.footer-legal{max-width:none}
.footer-meta{max-width:none}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1240px){
  .rail-link{display:none}
}
@media (max-width:1120px){
  .site-nav__idx{display:none}
  .site-nav__link{padding-inline:8px}
}
@media (max-width:1040px){
  .status-pill{display:none}
}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .header-rail{display:none}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    max-height:calc(100vh - 56px);
    overflow-y:auto;
    padding:8px clamp(16px,4vw,40px) 24px;
    background:var(--ink-800);
    border-bottom:1px solid var(--line-600);
    box-shadow:0 26px 44px -30px rgba(0,0,0,.95);
  }
  .site-nav[data-open]{display:flex}

  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid rgba(43,74,99,.55)}
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__link{
    width:100%;
    padding:14px 0 14px 12px;
    border-bottom:0;
    border-left:2px solid transparent;
    font-size:15px;
    color:var(--paper);
  }
  .site-nav__link[aria-current="page"]{
    border-bottom-color:transparent;
    border-left-color:var(--yellow);
    background:rgba(247,201,72,.06);
  }

  .nav-extras{
    display:block;
    margin-top:18px;
    padding-top:18px;
    border-top:1px solid rgba(43,74,99,.7);
  }
  .nav-extras__status{
    display:flex;
    align-items:center;
    gap:8px;
    font-family:var(--font-num);
    font-size:11px;
    letter-spacing:.08em;
    color:var(--muted);
  }
  .nav-extras__links{display:flex;flex-wrap:wrap;gap:20px;margin-top:14px;font-size:13px}
  .nav-extras__links a{color:var(--muted)}
  .nav-extras__links a:hover{color:var(--yellow)}
  .nav-extras__cta{width:100%;margin-top:18px}

  .grid--aside{grid-template-columns:minmax(0,1fr)}
  .grid--2,
  .grid--3{grid-template-columns:minmax(0,1fr)}
  .grid--12{grid-template-columns:minmax(0,1fr)}

  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .vlabel{
    writing-mode:horizontal-tb;
    border-left:0;
    padding-left:0;
    letter-spacing:.2em;
  }
}

@media (max-width:600px){
  body{font-size:16px}
  .brand__sub{display:none}
  .footer-cols{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-contact__key{display:block;min-width:0;margin-right:0}
}

/* ---------- 13. 可访问性与降级 ---------- */
#main-content{scroll-margin-top:72px}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}