/* ==========================================================================
   诺亚看台 · 共享样式 /assets/site.css
   夜色球场技术蓝图：炭黑底 + 墨绿分区 + 荧光青柠入口 + 信号橙提示
   ========================================================================== */

:root{
  --ink:#0B0F0D;
  --ink-deep:#070A09;
  --pitch:#0F2B22;
  --pitch-mid:#17453A;
  --lime:#C6FF3D;
  --lime-deep:#7FA82A;
  --signal:#FF6A2B;
  --orange-soft:#FFD9C2;
  --paper:#F2EAD9;
  --paper-shadow:#D9CDB4;
  --mist:#A8B3AC;
  --white:#F7FAF8;
  --line:rgba(217,205,180,.16);
  --line-strong:rgba(217,205,180,.32);
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:10px;
  --measure:684px;
  --shell:1280px;
  --pad:24px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:auto;}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px;border-radius:4px;}

/* ---------- 中文排版基线 ---------- */
body{
  background-color:var(--ink);
  background-image:
    linear-gradient(to right, rgba(217,205,180,.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217,205,180,.055) 1px, transparent 1px);
  background-size:96px 96px;
  background-position:0 0;
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:800;line-height:1.2;letter-spacing:-.02em;}
p{overflow-wrap:break-word;}
::selection{background:var(--lime);color:var(--ink);}

.mono{font-family:var(--font-mono);font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:0;}
.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;}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-90px;z-index:300;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--lime);color:var(--ink);
  font-size:13px;font-weight:700;letter-spacing:.06em;
  transition:top .18s ease;
}
.skip-link:focus{top:0;outline:2px solid var(--ink);outline-offset:-2px;}

/* ---------- 页头 ---------- */
.site-header{
  position:relative;z-index:70;
  background:var(--ink);
  border-bottom:1px solid var(--line);
}

.topbar{background:var(--ink-deep);border-bottom:1px solid var(--line);}
.topbar__inner{
  max-width:var(--shell);margin-inline:auto;
  min-height:36px;padding:6px var(--pad);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  font-size:12px;line-height:1.4;letter-spacing:.06em;color:var(--mist);
}
.topbar__status{display:inline-flex;align-items:center;gap:9px;flex-wrap:wrap;}
.topbar__meta{display:inline-flex;align-items:center;gap:10px;}
.topbar__link{color:var(--mist);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease;}
.topbar__link:hover,.topbar__link:focus-visible{color:var(--lime);border-bottom-color:var(--lime);}
.topbar__sep{color:var(--lime-deep);}
.topbar__lang{color:var(--white);letter-spacing:.16em;}

.status-dot{
  width:8px;height:8px;flex:none;border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 0 4px rgba(198,255,61,.14);
  animation:status-pulse 2s ease-in-out infinite;
}
.status-dot--orange{
  background:var(--signal);
  box-shadow:0 0 0 4px rgba(255,106,43,.18);
}
@keyframes status-pulse{
  0%,100%{opacity:1;transform:scale(1);}
  50%{opacity:.45;transform:scale(.8);}
}

.masthead{padding:26px var(--pad) 22px;}
.masthead__inner{position:relative;max-width:var(--shell);margin-inline:auto;text-align:center;}
.masthead__brand{position:relative;display:inline-block;margin:0;}
.masthead__wordmark{
  display:inline-block;
  font-size:clamp(30px,5.2vw,52px);font-weight:900;line-height:1;
  letter-spacing:-.03em;color:var(--white);
  transform:skewX(-3deg);transform-origin:center bottom;
  transition:color .2s ease;
}
.masthead__wordmark:hover{color:var(--lime);}
.masthead__brand::after{
  content:"";position:absolute;left:4%;right:4%;bottom:-12px;height:3px;
  background:var(--lime);border-radius:2px;
}
.masthead__subtitle{margin:20px 0 0;font-size:12px;letter-spacing:.28em;color:var(--mist);}
.masthead__signature{
  position:absolute;right:0;top:2px;margin:0;
  padding:5px 14px;border:1px solid var(--line-strong);border-radius:999px;
  font-size:11px;letter-spacing:.18em;color:var(--mist);
}

/* ---------- 栏目条 ---------- */
.nav-strip{
  position:relative;z-index:80;
  background:linear-gradient(180deg,rgba(15,43,34,.92),rgba(11,15,13,.96));
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.nav-strip__inner{
  position:relative;max-width:1180px;margin-inline:auto;
  padding:9px var(--pad);
  display:flex;align-items:center;justify-content:center;gap:10px;
}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:4px;}
.nav-list__item{display:block;}
.nav-link{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 18px;border-radius:999px;
  font-size:15px;font-weight:500;line-height:1.4;color:var(--white);
  border:1px solid transparent;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.nav-link:hover,.nav-link:focus-visible{background:rgba(23,69,58,.9);color:var(--lime);}
.nav-link--accent::before{
  content:"";width:6px;height:6px;flex:none;border-radius:50%;background:var(--lime);
}
.nav-link[aria-current="page"]{
  background:var(--lime);color:var(--ink);font-weight:700;border-color:var(--lime);
}
.nav-link--accent[aria-current="page"]::before{background:var(--ink);}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:8px 16px;border-radius:999px;border:1px solid var(--line-strong);
  font-size:13px;font-weight:500;letter-spacing:.1em;color:var(--white);
  transition:color .2s ease,border-color .2s ease;
}
.nav-toggle:hover{color:var(--lime);border-color:var(--lime);}

/* ---------- 悬浮入口条 ---------- */
.sticky-rail{
  position:fixed;left:0;right:0;top:0;z-index:120;
  background:rgba(7,10,9,.96);
  border-bottom:1px solid var(--line);
  transform:translateY(-100%);visibility:hidden;
  transition:transform .28s ease,visibility .28s ease;
}
.sticky-rail[data-show]{transform:translateY(0);visibility:visible;}
.sticky-rail__inner{
  max-width:var(--shell);margin-inline:auto;
  min-height:56px;padding:8px var(--pad);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.sticky-rail__brand{font-size:18px;font-weight:900;letter-spacing:-.02em;color:var(--white);transform:skewX(-3deg);}
.sticky-rail__brand:hover{color:var(--lime);}
.sticky-rail__actions{display:inline-flex;align-items:center;gap:8px;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;
  font-size:14px;font-weight:700;letter-spacing:.02em;line-height:1.4;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn:active{transform:translateY(1px);}
.btn--lime{background:var(--lime);color:var(--ink);}
.btn--lime:hover,.btn--lime:focus-visible{background:var(--lime-deep);color:var(--ink);}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--white);}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--lime);color:var(--lime);}
.btn--orange{background:var(--signal);color:#180900;}
.btn--orange:hover,.btn--orange:focus-visible{background:var(--orange-soft);color:#180900;}
.btn--sm{padding:8px 16px;font-size:13px;}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;background:var(--ink);border-top:1px solid var(--line);}
.footer-strip{border-top:3px solid var(--signal);background:var(--pitch);}
.footer-strip__inner{
  max-width:var(--shell);margin-inline:auto;padding:12px var(--pad);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 28px;
  font-size:12px;line-height:1.6;letter-spacing:.06em;color:var(--mist);
}
.footer-strip__item{display:inline-flex;align-items:center;gap:8px;}

.footer-main__inner{
  max-width:var(--shell);margin-inline:auto;
  padding:56px var(--pad) 44px;
  display:grid;grid-template-columns:1.35fr .9fr .9fr 1.35fr;gap:36px 40px;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:12px;}
.footer-brand__mark{font-size:26px;font-weight:900;letter-spacing:-.03em;color:var(--white);transform:skewX(-3deg);}
.footer-brand__sub{font-size:12px;letter-spacing:.14em;color:var(--mist);}
.footer-col{min-width:0;}
.footer-col__title{
  margin:0 0 14px;padding-bottom:10px;border-bottom:1px solid var(--line);
  font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--lime);
}
.footer-col__list{display:flex;flex-direction:column;gap:8px;font-size:14px;}
.footer-col__link{color:var(--mist);transition:color .2s ease;}
.footer-col__link:hover,.footer-col__link:focus-visible{color:var(--lime);}
.footer-col__text{color:var(--mist);}
.footer-col--contact .footer-col__list{gap:12px;}
.footer-line{display:grid;grid-template-columns:44px minmax(0,1fr);gap:10px;font-size:13px;line-height:1.65;}
.footer-line__label{font-size:12px;letter-spacing:.08em;color:var(--lime-deep);}
.footer-line__value{color:var(--mist);overflow-wrap:anywhere;}

.footer-base{border-top:1px solid var(--line);}
.footer-base__inner{
  max-width:var(--shell);margin-inline:auto;padding:16px var(--pad) 26px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-size:12px;letter-spacing:.04em;color:var(--mist);
}
.footer-base__meta{margin:0;}
.footer-base__legal{display:flex;flex-wrap:wrap;gap:18px;}
.footer-base__link{color:var(--mist);transition:color .2s ease;}
.footer-base__link:hover,.footer-base__link:focus-visible{color:var(--lime);}

/* ---------- 容器与节奏 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad);}
.container--narrow{max-width:960px;}
.section{position:relative;padding-block:64px;}
.section + .section{border-top:1px solid var(--line);}

/* ---------- 标题与索引 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--lime);
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--lime);}
.display{
  font-size:clamp(34px,5vw,56px);font-weight:900;line-height:1.08;
  letter-spacing:-.03em;transform:skewX(-3deg);transform-origin:left bottom;
}
.lede{max-width:var(--measure);font-size:17px;line-height:1.8;color:var(--mist);}
.index-num{
  display:block;
  font-family:var(--font-mono);font-weight:600;
  font-size:clamp(48px,9vw,72px);line-height:1;
  letter-spacing:-.04em;color:var(--lime);opacity:.18;
}

/* ---------- 胶囊标签 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px;}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  font-size:12px;font-weight:500;letter-spacing:.08em;
  color:var(--mist);background:rgba(23,69,58,.45);border:1px solid var(--line-strong);
}
.pill--lime{background:var(--lime);color:var(--ink);border-color:var(--lime);font-weight:700;}
.pill--orange{background:rgba(255,106,43,.16);color:var(--orange-soft);border-color:rgba(255,106,43,.5);}
.pill--paper{background:var(--paper);color:#2A2A24;border-color:var(--paper);}

/* ---------- 卡片 / 面板 ---------- */
.card{
  position:relative;display:flex;flex-direction:column;gap:14px;
  padding:22px;border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(23,69,58,.55),rgba(15,43,34,.92));
  border:1px solid var(--line);
  transition:border-color .22s ease,transform .22s ease;
}
.card:hover{border-color:var(--lime-deep);transform:translateY(-2px);}
.card__title{font-size:20px;font-weight:800;letter-spacing:-.01em;}
.card__meta{display:flex;flex-wrap:wrap;gap:12px;font-family:var(--font-mono);font-size:12px;color:var(--mist);}
.card__body{font-size:15px;line-height:1.7;color:var(--mist);}
.card--paper{background:var(--paper);color:#1C221E;border-color:var(--paper-shadow);}
.card--paper .card__body,.card--paper .card__meta{color:#4A5247;}

.panel{
  padding:28px;border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(23,69,58,.6),rgba(11,15,13,.9));
  border:1px solid var(--line);
}
.panel--paper{background:var(--paper);color:#1C221E;border-color:var(--paper-shadow);}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:24px;}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 蓝图背景 ---------- */
.blueprint{
  background-image:
    linear-gradient(to right, rgba(217,205,180,.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217,205,180,.1) 1px, transparent 1px);
  background-size:64px 64px;
}

/* ---------- 图片容器基础（页面阶段放入 <img>） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--pitch-mid),var(--ink-deep));
}
.media--wide{aspect-ratio:16 / 9;}
.media--tall{aspect-ratio:4 / 5;}
.media--square{aspect-ratio:1 / 1;}
.media > img{width:100%;height:100%;object-fit:cover;}
.media__cap{
  position:absolute;left:12px;bottom:12px;right:12px;
  padding:6px 12px;border-radius:var(--radius-sm);
  background:rgba(11,15,13,.78);
  font-size:12px;line-height:1.5;color:var(--mist);
}

/* ---------- 面包屑 ---------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.06em;color:var(--mist);}
.crumbs a{color:var(--mist);transition:color .2s ease;}
.crumbs a:hover,.crumbs a:focus-visible{color:var(--lime);}
.crumbs__sep{color:var(--lime-deep);}
.crumbs [aria-current="page"]{color:var(--white);}

/* ---------- 长文阅读区 ---------- */
.prose{max-width:var(--measure);font-size:17px;line-height:1.85;color:var(--white);}
.prose > * + *{margin-top:1.1em;}
.prose h2{font-size:26px;margin-top:1.9em;}
.prose h3{font-size:20px;margin-top:1.5em;}
.prose a{color:var(--lime);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px;}
.prose strong{color:var(--lime);font-weight:700;}
.prose ul > li{position:relative;padding-left:18px;}
.prose ul > li::before{
  content:"";position:absolute;left:0;top:.75em;
  width:6px;height:6px;border-radius:50%;background:var(--lime);
}
.prose--paper{color:#1C221E;}
.prose--paper strong{color:#3F6B12;}
.prose--paper a{color:#3F6B12;}

/* ---------- 章节索引 ---------- */
.toc{display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--line);}
.toc__link{
  display:flex;align-items:center;gap:10px;
  margin-left:-1px;padding:8px 0 8px 14px;
  border-left:2px solid transparent;
  font-size:13px;line-height:1.5;color:var(--mist);
  transition:color .2s ease,border-color .2s ease;
}
.toc__link:hover{color:var(--white);}
.toc__link.is-active{color:var(--lime);border-left-color:var(--lime);}
.toc__num{font-family:var(--font-mono);font-size:12px;opacity:.7;}

/* ---------- 阅读进度条 ---------- */
.read-progress{
  position:fixed;left:0;right:0;top:0;height:3px;z-index:200;
  background:linear-gradient(90deg,var(--lime),var(--signal));
  transform:scaleX(0);transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 入场显现 ---------- */
html.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .3s ease-out,transform .3s ease-out;
}
html.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .footer-main__inner{grid-template-columns:1fr 1fr;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .section{padding-block:52px;}
}

/* ---------- 手机导航与外壳 ---------- */
@media (max-width:860px){
  :root{--pad:18px;}
  .topbar__inner{font-size:11px;gap:10px;}
  .masthead{padding:20px var(--pad) 18px;}
  .masthead__signature{
    position:static;display:inline-block;margin-top:16px;
  }
  .masthead__subtitle{letter-spacing:.2em;}

  .nav-strip__inner{justify-content:flex-start;padding:10px var(--pad);}
  .nav-toggle{display:inline-flex;}
  .nav-toggle::after{
    content:"";width:9px;height:9px;
    border-right:2px solid var(--lime);border-bottom:2px solid var(--lime);
    transform:translateY(-2px) rotate(45deg);
    transition:transform .22s ease;
  }
  .site-header[data-open] .nav-toggle{border-color:var(--lime);color:var(--lime);}
  .site-header[data-open] .nav-toggle::after{transform:translateY(1px) rotate(-135deg);}
  .nav-list{
    position:absolute;left:0;right:0;top:100%;z-index:90;
    display:none;flex-direction:column;flex-wrap:nowrap;align-items:stretch;gap:2px;
    padding:12px var(--pad) 18px;
    background:var(--pitch);
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 48px rgba(0,0,0,.5);
  }
  .site-header[data-open] .nav-list{display:flex;}
  .nav-link{padding:12px 16px;border-radius:12px;font-size:16px;justify-content:flex-start;}
  .sticky-rail__brand{font-size:15px;}
}

@media (max-width:640px){
  .footer-main__inner{grid-template-columns:minmax(0,1fr);gap:32px;padding-top:40px;padding-bottom:32px;}
  .footer-base__inner{flex-direction:column;align-items:flex-start;}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .section{padding-block:40px;}
  .btn{padding:11px 18px;}
  .sticky-rail__actions .btn--ghost{display:none;}
}

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