/* =========================================================
   真人对接看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:110px}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

:root{
  --c-fir:#061713;
  --c-fir-2:#0E2A24;
  --c-cyan:#2BE7C8;
  --c-cyan-soft:rgba(43,231,200,.12);
  --c-cyan-white:#CFFCF3;
  --c-amber:#FFB64D;
  --c-orange:#FF7A3D;
  --c-wine:#B0335A;
  --c-indigo:#3A2A6B;
  --c-chalk:#EEF3F1;
  --c-mute:#7C9A93;
  --line:rgba(43,231,200,.22);
  --line-2:rgba(124,154,147,.26);
  --ink-on-cyan:#04140F;
  --ink-on-amber:#1B1200;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-head:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:"Roboto Condensed","Oswald","Bahnschrift Condensed","Arial Narrow",system-ui,sans-serif;
  --pad:clamp(16px,4vw,40px);
  --maxw:1280px;
  --pill:999px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--c-chalk);
  background-color:var(--c-fir);
  background-image:
    radial-gradient(1100px 520px at 78% -8%, rgba(43,231,200,.10), transparent 62%),
    radial-gradient(760px 420px at 2% 14%, rgba(255,122,61,.07), transparent 60%),
    radial-gradient(900px 620px at 50% 110%, rgba(58,42,107,.30), transparent 66%);
  background-attachment:fixed;
}

/* 精密网格底纹：深夜看台坐标 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(124,154,147,.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,154,147,.075) 1px, transparent 1px);
  background-size:96px 96px;
  -webkit-mask-image:radial-gradient(circle at 50% 38%, #000 38%, transparent 88%);
  mask-image:radial-gradient(circle at 50% 38%, #000 38%, transparent 88%);
}

main{position:relative;z-index:1}

h1,h2,h3,h4,h5{font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;line-height:1.2}
h1{font-size:clamp(34px,5.2vw,64px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px)}
p{max-width:68ch}

a{color:var(--c-cyan)}
a:hover{color:var(--c-cyan-white)}

:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px;border-radius:2px}

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

/* ---------- 布局骨架 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,1.6vw,24px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}
.band{padding-block:clamp(36px,5vw,72px);border-top:1px solid var(--line-2)}
.band--fir{background:linear-gradient(180deg, rgba(14,42,36,.72), rgba(6,23,19,.2))}
.band--deep{background:linear-gradient(180deg, rgba(6,23,19,.9), rgba(14,42,36,.55))}
.band--indigo{background:linear-gradient(160deg, rgba(58,42,107,.72), rgba(6,23,19,.55));border-top-color:rgba(58,42,107,.9)}

/* ---------- 排版层级 ---------- */
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--c-amber);margin-bottom:10px}
.section-title{font-size:clamp(26px,3.4vw,40px);margin-bottom:14px}
.chapter-number{
  display:block;
  font-family:var(--font-num);
  font-size:clamp(64px,12vw,180px);
  font-weight:700;
  line-height:.82;
  letter-spacing:-.03em;
  color:rgba(43,231,200,.14);
  -webkit-text-stroke:1px rgba(43,231,200,.42);
  margin-bottom:-.06em;
}
.lede{font-size:clamp(17px,1.6vw,20px);color:var(--c-cyan-white);line-height:1.7}
.prose{font-size:17px;line-height:1.75;color:var(--c-chalk)}
.prose p+p{margin-top:1.1em}
.prose strong{color:var(--c-cyan-white);font-weight:700}
.num{font-family:var(--font-num);font-weight:700;letter-spacing:0;font-variant-numeric:tabular-nums}
.muted{color:var(--c-mute);font-size:13px;line-height:1.7}

/* ---------- 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;
  font-size:14px;font-weight:700;letter-spacing:.01em;
  border:1px solid transparent;border-radius:var(--pill);
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .18s var(--ease);
}
.btn-primary{background:var(--c-cyan);color:var(--ink-on-cyan)}
.btn-primary:hover{background:var(--c-cyan-white);color:var(--ink-on-cyan);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);background:rgba(6,23,19,.42);color:var(--c-chalk)}
.btn-ghost:hover{border-color:var(--c-cyan);color:var(--c-cyan);transform:translateY(-1px)}
.btn-amber{background:var(--c-amber);color:var(--ink-on-amber)}
.btn-amber:hover{background:var(--c-orange);color:#1B0A00;transform:translateY(-1px)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;
  font-size:12px;font-weight:600;letter-spacing:.04em;
  color:var(--c-cyan);background:var(--c-cyan-soft);
  border:1px solid var(--line);border-radius:var(--pill);
}

/* ---------- 卡片 / 面包屑 / 章节索引 ---------- */
.card{
  background:var(--c-fir-2);
  border:1px solid var(--line-2);
  padding:clamp(16px,1.8vw,24px);
  transition:border-color .2s var(--ease),transform .2s var(--ease);
}
.card:hover{border-color:var(--line);transform:translateY(-1px)}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--c-mute);margin-bottom:18px}
.breadcrumb a{color:var(--c-mute)}
.breadcrumb a:hover{color:var(--c-cyan)}
.breadcrumb li::after{content:"/";margin-left:8px;color:rgba(124,154,147,.5)}
.breadcrumb li:last-child::after{content:""}
.chapter-index{display:flex;flex-direction:column;gap:2px;border-left:1px solid var(--line-2);padding-left:14px}
.chapter-link{
  display:flex;gap:10px;align-items:baseline;
  padding:7px 0;font-size:13.5px;color:var(--c-mute);
  border-left:2px solid transparent;margin-left:-16px;padding-left:14px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.chapter-link:hover{color:var(--c-chalk)}
.chapter-link.is-active{color:var(--c-cyan);border-left-color:var(--c-cyan)}

/* ---------- 主题筛选（只筛当前页已有条目） ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:22px}
.filter-btn{
  padding:7px 15px;font-size:13px;font-weight:600;
  color:var(--c-mute);background:rgba(14,42,36,.7);
  border:1px solid var(--line-2);border-radius:var(--pill);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.filter-btn:hover{color:var(--c-chalk);border-color:var(--line)}
.filter-btn[aria-pressed="true"]{background:var(--c-cyan);border-color:var(--c-cyan);color:var(--ink-on-cyan)}
.is-hidden{display:none !important}

/* ---------- 可复用图片容器 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line-2);
  background:
    linear-gradient(160deg, rgba(14,42,36,.95), rgba(6,23,19,.95) 72%),
    repeating-linear-gradient(90deg, rgba(43,231,200,.12) 0 1px, transparent 1px 26px);
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06) brightness(.92)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;
  font-size:12.5px;color:var(--c-cyan-white);
  background:linear-gradient(0deg, rgba(6,23,19,.92), rgba(6,23,19,0));
}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* =========================================================
   头部：悬浮胶囊导航
   ========================================================= */
.skip-link{
  position:fixed;left:16px;top:-80px;z-index:300;
  padding:10px 18px;
  background:var(--c-cyan);color:var(--ink-on-cyan);
  font-size:14px;font-weight:700;
  border-radius:0 0 6px 6px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;top:0;z-index:100;
  padding:10px var(--pad) 0;
}
.score-bar{
  position:absolute;top:0;left:0;right:0;height:2px;
  background:rgba(43,231,200,.14);
  overflow:hidden;
}
.score-bar-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg, var(--c-cyan), var(--c-amber));
  transition:width .12s linear;
}

.nav-capsule{
  position:relative;
  display:flex;align-items:center;gap:clamp(10px,1.4vw,22px);
  max-width:var(--maxw);margin-inline:auto;
  padding:9px clamp(12px,1.6vw,20px);
  background:rgba(14,42,36,.88);
  border:1px solid var(--line);
  border-radius:var(--pill);
  box-shadow:0 22px 48px -30px #000, inset 0 0 0 1px rgba(255,255,255,.02);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  transition:padding .3s var(--ease),background .3s var(--ease);
}
.site-header.is-condensed .nav-capsule{padding:5px clamp(12px,1.6vw,20px);background:rgba(6,23,19,.94)}
.site-header.is-condensed .brand-tag,
.site-header.is-condensed .nav-status{display:none}

.nav-brand{display:flex;align-items:center;gap:11px;margin-right:auto;color:var(--c-chalk)}
.brand-mark{
  position:relative;width:26px;height:26px;flex:0 0 26px;
  border:1px solid rgba(43,231,200,.55);
  background:rgba(6,23,19,.7);
  overflow:hidden;
}
.brand-mark::before{content:"";position:absolute;inset:5px;background:var(--c-cyan)}
.brand-mark::after{content:"";position:absolute;right:0;bottom:0;width:11px;height:11px;background:var(--c-amber)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-head);font-size:15.5px;font-weight:900;letter-spacing:-.02em}
.brand-tag{font-size:10.5px;letter-spacing:.06em;color:var(--c-mute)}

.nav-links{display:flex;align-items:center;gap:2px}
.nav-link{
  padding:8px 12px;
  font-size:14px;font-weight:600;color:var(--c-mute);
  border-radius:var(--pill);white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--c-chalk);background:rgba(43,231,200,.09)}
.nav-link[aria-current="page"]{background:var(--c-cyan);color:var(--ink-on-cyan)}

.nav-actions{display:flex;align-items:center;gap:12px}
.nav-status{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--c-mute);white-space:nowrap}
.status-dot{
  width:7px;height:7px;flex:0 0 7px;border-radius:50%;
  background:var(--c-cyan);
  animation:statusPulse 2.6s ease-in-out infinite;
}
@keyframes statusPulse{
  0%,100%{box-shadow:0 0 0 3px rgba(43,231,200,.20)}
  50%{box-shadow:0 0 0 9px rgba(43,231,200,.03)}
}
.nav-cta{padding:9px 18px}

.nav-toggle{
  display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;
  width:42px;height:42px;flex:0 0 42px;
  border:1px solid var(--line);border-radius:var(--pill);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);background:rgba(43,231,200,.08)}
.nav-toggle-bars{display:block;width:16px;height:1.5px;background:var(--c-chalk);transition:transform .25s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{transform:translateY(2.75px)}
.nav-toggle[aria-expanded="true"]::after{content:"";display:block;width:16px;height:1.5px;background:var(--c-cyan);transform:translateY(-2.75px)}

/* =========================================================
   页脚：看台墨绿 + 灯带
   ========================================================= */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(48px,7vw,96px);
  background:var(--c-fir-2);
  border-top:1px solid var(--line);
  color:var(--c-chalk);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:5px;
  background:repeating-linear-gradient(90deg,
    var(--c-orange) 0 18px, transparent 18px 34px,
    var(--c-cyan) 34px 42px, transparent 42px 74px);
  opacity:.55;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(220px,1.1fr) minmax(0,2fr) minmax(260px,1.4fr);
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(40px,5vw,66px);
}
.footer-sign{font-family:var(--font-head);font-size:22px;font-weight:900;letter-spacing:-.02em}
.footer-rule{display:block;width:56px;height:2px;background:var(--c-cyan);margin:14px 0}
.footer-note{max-width:28ch;font-size:13.5px;line-height:1.75;color:var(--c-mute)}
.footer-nav-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2vw,32px)}
.footer-group-title{
  font-family:var(--font-head);
  font-size:12px;font-weight:700;letter-spacing:.18em;
  color:var(--c-amber);margin-bottom:14px;
}
.footer-list li+li{margin-top:10px}
.footer-list a{
  display:inline-block;padding:2px 0;
  font-size:14px;color:var(--c-chalk);opacity:.86;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),opacity .2s var(--ease),border-color .2s var(--ease);
}
.footer-list a:hover{color:var(--c-cyan);opacity:1;border-bottom-color:var(--c-cyan)}
.footer-contact .contact-row{
  display:flex;align-items:flex-start;gap:10px;
  padding:9px 0;
  border-bottom:1px solid var(--line-2);
}
.contact-label{flex:0 0 40px;font-size:12px;color:var(--c-mute);padding-top:3px;letter-spacing:.08em}
.contact-value{flex:1 1 auto;font-size:13.5px;line-height:1.65;word-break:break-word;color:var(--c-chalk)}
.copy-btn{
  flex:0 0 auto;
  padding:3px 10px;
  font-size:11px;font-weight:600;
  color:var(--c-cyan);
  border:1px solid var(--line);border-radius:var(--pill);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:var(--c-cyan);color:var(--ink-on-cyan);border-color:var(--c-cyan)}
.copy-btn[data-copied]{background:var(--c-amber);border-color:var(--c-amber);color:var(--ink-on-amber)}
.contact-note{margin-top:14px;font-size:12.5px;line-height:1.7;color:var(--c-mute);max-width:40ch}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;
  padding:18px 0 28px;
  border-top:1px solid var(--line-2);
  font-size:12.5px;color:var(--c-mute);
}
.footer-copyright,.footer-legal{max-width:none}
.footer-legal{color:var(--c-mute)}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1200px){
  .nav-link{padding:8px 9px;font-size:13px}
  .nav-cta{padding:9px 14px;font-size:13px}
}
@media (max-width:1020px){
  .site-header{padding-top:8px}
  .nav-toggle{display:flex}
  .nav-status{display:none}
  .nav-links{
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:2px;
    padding:10px;
    background:rgba(6,23,19,.97);
    border:1px solid var(--line);
    border-radius:20px;
    box-shadow:0 26px 50px -30px #000;
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
  }
  .nav-links[data-open]{display:flex}
  .nav-link{padding:11px 14px;font-size:14.5px;border-radius:10px}
  .footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1/-1}
  .footer-contact{grid-column:1/-1}
}
@media (max-width:980px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 6}
}
@media (max-width:620px){
  body{font-size:16.5px}
  .brand-tag{display:none}
  .nav-cta{padding:8px 12px;font-size:12.5px}
  .nav-capsule{gap:8px}
  .grid-12{grid-template-columns:minmax(0,1fr)}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:1/-1}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-nav-groups{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .media-frame--wide{aspect-ratio:16/9}
}

/* =========================================================
   可访问性偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
  .score-bar-fill{transition:none}
  .card:hover,.btn:hover{transform:none}
}