/* =========================================================
   C7娱乐主站 · /assets/site.css
   共享外壳：框架式导航 + 展览画册式节奏
   ========================================================= */

/* ---------- 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,ul,ol,li,figure,blockquote,dl,dt,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
summary{cursor:pointer}

/* ---------- 2. Tokens ---------- */
:root{
  --obsidian:#07070C;
  --indigo:#131A3A;
  --indigo-mid:#1E2A5E;
  --cyan:#35F2E0;
  --cyan-soft:rgba(53,242,224,.08);
  --amber:#FFB13B;
  --magenta:#FF3D8B;
  --text:#C9CFE3;
  --muted:#8A93B2;
  --line:#2A3457;
  --light:#E8FFFB;
  --rail-w:72px;
  --shell-max:1400px;
  --gutter:clamp(18px,4vw,56px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-cjk:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 3. Base / 中文排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--font-cjk);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--obsidian);
  background-image:
    radial-gradient(1100px 620px at 82% -6%, rgba(53,242,224,.085), transparent 62%),
    radial-gradient(820px 520px at 4% 2%, rgba(255,61,139,.05), transparent 60%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{font-weight:900;line-height:1.2;letter-spacing:-.02em;color:var(--light)}
h1{font-size:clamp(32px,5.2vw,62px);letter-spacing:-.038em;line-height:1.1}
h2{font-size:clamp(24px,3.2vw,38px)}
h3{font-size:clamp(18px,2vw,24px);letter-spacing:-.015em}
h4{font-size:17px;letter-spacing:-.01em}
p{max-width:68ch}
strong,b{color:var(--light);font-weight:700}
::selection{background:var(--cyan);color:#04121A}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

/* ---------- 4. Utilities ---------- */
.shell{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--gutter)}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.eyebrow{display:inline-flex;align-items:center;gap:.7em;font-size:11px;letter-spacing:.16em;color:var(--muted);font-weight:500}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);flex:none}
.eyebrow--amber::before{background:var(--amber)}
.skip-link{position:fixed;top:10px;left:10px;z-index:200;padding:11px 20px;border-radius:2px;background:var(--cyan);color:#04121A;font-weight:700;letter-spacing:.06em;transform:translateY(-200%);transition:transform .18s var(--ease)}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 5. 头部框架 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(19,26,58,.98),rgba(7,7,12,.98));
  border-bottom:1px solid var(--line);
}
.status-strip{background:rgba(7,7,12,.6);border-bottom:1px solid var(--line)}
.status-strip__inner{
  max-width:var(--shell-max);margin-inline:auto;
  padding:8px var(--gutter);
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  font-size:12px;letter-spacing:.08em;color:var(--muted);
}
.status-strip__key{color:var(--muted)}
.status-strip__value{font-family:var(--font-mono);letter-spacing:.06em;color:var(--cyan);font-variant-numeric:tabular-nums}
.status-strip__dot{width:6px;height:6px;flex:none;border-radius:50%;background:var(--magenta);box-shadow:0 0 0 3px rgba(255,61,139,.18)}
.status-strip__note{color:var(--text)}
.status-strip__note::before{content:"/ ";color:var(--line)}
.status-strip__spacer{flex:1 1 auto;min-width:8px}
.status-strip__meta{font-family:var(--font-mono);font-size:11.5px;color:var(--muted)}

.header-band__inner{
  max-width:var(--shell-max);margin-inline:auto;
  padding:11px var(--gutter);
  display:flex;align-items:center;gap:22px;
}
.brand-block{display:flex;align-items:center;gap:12px;min-width:0;flex:none}
.brand-mark{
  display:grid;place-items:center;flex:none;
  width:42px;height:42px;
  border:1px solid var(--cyan);border-radius:2px;
  background:linear-gradient(180deg,rgba(53,242,224,.16),rgba(53,242,224,0));
  color:var(--cyan);font-family:var(--font-mono);font-weight:700;font-size:15px;letter-spacing:.02em;
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-size:17px;font-weight:900;letter-spacing:-.02em;color:var(--light);line-height:1.3}
.brand-line{font-size:11px;letter-spacing:.14em;color:var(--muted);line-height:1.5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__link{
  display:block;padding:9px 12px;border:1px solid transparent;border-radius:2px;
  font-size:14px;letter-spacing:.06em;color:var(--text);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.site-nav__link:hover{color:var(--light);border-color:var(--line);background:var(--cyan-soft)}
.site-nav__link[aria-current="page"]{color:var(--cyan);border-color:var(--cyan)}

.header-cta{display:flex;align-items:center;gap:10px;flex:none}
.nav-toggle{
  display:none;margin-left:auto;align-items:center;gap:10px;
  padding:9px 15px;border:1px solid var(--line);border-radius:2px;
  font-size:12.5px;letter-spacing:.16em;color:var(--text);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.nav-toggle:hover{color:var(--light);border-color:var(--cyan)}
.nav-toggle__label{font-weight:500}
.nav-toggle__bars{display:grid;gap:3px;width:18px}
.nav-toggle__bars i{display:block;height:1px;background:var(--cyan);font-style:normal}
.site-header[data-open] .nav-toggle{color:var(--cyan);border-color:var(--cyan)}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.scroll-progress__bar{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transition:transform .12s linear;
}

/* ---------- 6. 左侧分区导轨 ---------- */
.zone-rail{display:none}
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  .zone-rail{
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
    position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);z-index:75;
    border-right:1px solid var(--line);
    background:linear-gradient(180deg,rgba(19,26,58,.92),rgba(7,7,12,.92));
  }
  .zone-rail__cap{writing-mode:vertical-rl;font-size:10px;letter-spacing:.34em;color:var(--muted)}
  .zone-rail__list{display:grid;gap:9px;justify-items:center}
  .zone-rail__item{display:flex;align-items:center;justify-content:center;width:100%}
  .zone-rail__num{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;color:var(--muted);font-variant-numeric:tabular-nums}
  .zone-rail__item:nth-child(3n+1) .zone-rail__num{color:var(--cyan)}
  .zone-rail__item:nth-child(4n+2) .zone-rail__num{color:var(--amber)}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--obsidian),#0B1027 52%,var(--obsidian));
  color:var(--muted);font-size:14px;
}
.footer-top{padding-block:clamp(48px,7vh,88px)}
.footer-grid{display:grid;grid-template-columns:1.35fr .85fr 1fr 1fr 1.25fr;gap:clamp(24px,3vw,48px)}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-kicker{font-size:11px;letter-spacing:.24em;color:var(--cyan);max-width:none}
.footer-brandname{font-size:22px;font-weight:900;letter-spacing:-.02em;color:var(--light);max-width:none}
.footer-line{font-size:13.5px;line-height:1.8;color:var(--muted);max-width:34ch}
.footer-cta{margin-top:8px}
.footer-col{min-width:0}
.footer-title{
  font-size:11.5px;font-weight:500;letter-spacing:.2em;color:var(--text);
  padding-bottom:12px;border-bottom:1px solid var(--line);margin-bottom:16px;
}
.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:9px 16px}
.footer-links a{font-size:13.5px;color:var(--muted);transition:color .16s var(--ease)}
.footer-links a:hover{color:var(--cyan)}
.footer-beats{display:grid;gap:12px}
.footer-beats li{display:flex;gap:12px;align-items:baseline}
.beat-num{flex:none;min-width:52px;font-family:var(--font-mono);font-size:14px;color:var(--cyan);font-variant-numeric:tabular-nums}
.beat-txt{font-size:13.5px;line-height:1.7;color:var(--muted)}
.footer-meta{display:grid;gap:12px}
.footer-meta>div{display:grid;gap:3px}
.footer-meta dt{font-size:11px;letter-spacing:.16em;color:var(--muted)}
.footer-meta dd{font-size:13.5px;line-height:1.7;color:var(--text);word-break:break-word}
.footer-note{margin-top:16px;padding-left:13px;border-left:2px solid var(--amber);font-size:12.5px;line-height:1.75;color:var(--muted);max-width:38ch}
.footer-base{border-top:1px solid var(--line);background:rgba(19,26,58,.55)}
.footer-base__inner{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding-block:18px;font-size:12px;letter-spacing:.1em;color:var(--muted)}
.footer-copy{max-width:none}
.footer-icp{font-family:var(--font-mono);max-width:none}
.to-top{
  margin-left:auto;padding:8px 15px;border:1px solid var(--line);border-radius:2px;
  font-size:12px;letter-spacing:.14em;color:var(--text);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.to-top:hover{color:var(--cyan);border-color:var(--cyan)}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:12px 22px;border:1px solid var(--line);border-radius:2px;
  font-size:14px;letter-spacing:.08em;color:var(--text);background:transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease),transform .16s var(--ease);
}
.btn:hover{color:var(--light);border-color:var(--cyan);background:var(--cyan-soft)}
.btn:active{transform:translateY(1px)}
.btn--solid{background:var(--cyan);border-color:var(--cyan);color:#04121A;font-weight:700}
.btn--solid:hover{background:#5ff6e8;border-color:#5ff6e8;color:#04121A}
.btn--ghost{border-color:var(--line)}
.btn--sm{padding:8px 14px;font-size:12.5px;letter-spacing:.1em}
.btn--arrow::after{content:"→";font-family:var(--font-mono);font-size:.95em;opacity:.75}

/* ---------- 9. 面包屑与正文容器 ---------- */
.breadcrumbs{border-bottom:1px solid var(--line);background:rgba(19,26,58,.35)}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;padding-block:16px;font-size:12px;letter-spacing:.12em;color:var(--muted)}
.breadcrumbs__list li{display:flex;align-items:center}
.breadcrumbs__list li+li::before{content:"/";margin:0 10px;color:var(--line)}
.breadcrumbs a{transition:color .16s var(--ease)}
.breadcrumbs a:hover{color:var(--cyan)}
.prose{max-width:68ch}
.prose p{margin-bottom:1em}
.prose h2{margin-top:1.7em;margin-bottom:.55em}
.prose h3{margin-top:1.4em;margin-bottom:.45em}
.prose ul{margin:0 0 1.3em;display:grid;gap:.5em}
.prose li{position:relative;padding-left:1.15em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:7px;height:1px;background:var(--cyan)}
.prose blockquote{margin:1.6em 0;padding:.25em 0 .25em 20px;border-left:2px solid var(--amber);color:var(--light)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(53,242,224,.36)}
.prose a:hover{color:var(--light);border-bottom-color:var(--light)}

/* ---------- 10. 网格与章节节奏 ---------- */
.section{padding-block:clamp(56px,9vh,120px)}
.section--tight{padding-block:clamp(32px,5vh,64px)}
.section--band{background:var(--indigo);border-block:1px solid var(--line)}
.section__head{max-width:62ch}
.section-title{margin-top:14px}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--7-3{grid-template-columns:7fr 3fr}
.grid--5-3-3{grid-template-columns:5fr 3fr 3fr}
.grid--cards{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}

/* ---------- 11. 展签 / 数据 / 表格 ---------- */
.plaque{
  position:relative;padding:22px 22px 20px;border:1px solid var(--line);border-radius:2px;
  background:linear-gradient(180deg,var(--indigo-mid),var(--indigo));
}
.plaque::before{content:"";position:absolute;top:5px;right:5px;width:12px;height:12px;border-top:1px solid var(--cyan);border-right:1px solid var(--cyan);opacity:.65}
.plaque__tag{display:inline-block;padding:3px 9px;border:1px solid rgba(53,242,224,.42);border-radius:2px;font-size:11px;letter-spacing:.16em;color:var(--cyan)}
.plaque__title{margin:14px 0 8px;font-size:18px;color:var(--light)}
.plaque__desc{font-size:15px;color:var(--text);max-width:none}
.plaque__meta{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font-family:var(--font-mono);font-size:12px;color:var(--muted);max-width:none}
.stat-figure{display:flex;flex-direction:column;gap:6px;max-width:none}
.stat-figure__value{
  font-family:var(--font-mono);font-weight:700;font-size:clamp(40px,7vw,88px);line-height:.95;
  letter-spacing:-.03em;color:var(--cyan);font-variant-numeric:tabular-nums;
  text-shadow:0 0 22px rgba(53,242,224,.35);
}
.stat-figure--amber .stat-figure__value{color:var(--amber);text-shadow:0 0 22px rgba(255,177,59,.32)}
.stat-figure__unit{margin-left:.35em;font-size:.32em;letter-spacing:.1em;color:var(--muted);text-shadow:none}
.stat-figure__label{font-size:12px;letter-spacing:.16em;color:var(--muted)}
.chip{display:inline-flex;align-items:center;gap:.5em;padding:3px 9px;border:1px solid var(--line);border-radius:2px;font-size:11.5px;letter-spacing:.14em;color:var(--muted)}
.chip--cyan{color:var(--cyan);border-color:rgba(53,242,224,.45)}
.chip--amber{color:var(--amber);border-color:rgba(255,177,59,.45)}
.chip--magenta{color:var(--magenta);border-color:rgba(255,61,139,.45)}
.tick-scale{display:flex;align-items:flex-end;gap:6px;height:56px;margin:0}
.tick-scale__seg{position:relative;flex:1;height:100%;border-top:1px solid var(--line);background:linear-gradient(180deg,var(--indigo-mid),rgba(30,42,94,.25))}
.tick-scale__seg--hi{border-top-color:var(--amber)}
.tick-scale__seg span{position:absolute;left:0;bottom:-22px;font-family:var(--font-mono);font-size:11px;color:var(--muted)}
.data-table__wrap{overflow-x:auto;border:1px solid var(--line);border-radius:2px}
.data-table{font-size:14px;min-width:520px}
.data-table caption{padding:0 0 10px;text-align:left;font-size:12px;letter-spacing:.16em;color:var(--muted)}
.data-table th{padding:10px 14px;border-bottom:1px solid var(--cyan);text-align:left;font-size:12px;font-weight:500;letter-spacing:.12em;color:var(--muted);white-space:nowrap}
.data-table td{padding:13px 14px;border-bottom:1px solid var(--line);color:var(--text);vertical-align:top}
.data-table tbody tr:hover td{background:rgba(30,42,94,.45)}
.data-table .num{font-family:var(--font-mono);color:var(--light);font-variant-numeric:tabular-nums}

/* ---------- 12. 图片容器 ---------- */
.media-frame{
  position:relative;width:100%;overflow:hidden;border:1px solid var(--line);border-radius:2px;
  background-color:var(--indigo);
  background-image:
    repeating-linear-gradient(90deg,rgba(53,242,224,.07) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(0deg,rgba(53,242,224,.07) 0 1px,transparent 1px 44px),
    linear-gradient(180deg,rgba(19,26,58,.95),rgba(7,7,12,.95));
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}
.media-frame__cap{position:absolute;left:0;bottom:0;padding:8px 13px;border-top:1px solid var(--line);background:rgba(7,7,12,.78);font-size:11px;letter-spacing:.14em;color:var(--muted)}

/* ---------- 13. 标签页 / 折叠 / 锚点 ---------- */
.tabs{display:block}
.tabs__list{display:flex;flex-wrap:wrap;gap:2px;border-bottom:1px solid var(--line)}
.tabs__tab{
  padding:12px 18px;border:1px solid transparent;border-bottom:2px solid transparent;border-radius:2px 2px 0 0;
  font-size:13px;letter-spacing:.12em;color:var(--muted);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.tabs__tab:hover{color:var(--text);background:var(--cyan-soft)}
.tabs__tab[aria-selected="true"]{color:var(--cyan);border-bottom-color:var(--cyan)}
.tabs__panel{padding-top:24px}
.tabs__panel[hidden]{display:none}
.fold{margin-bottom:10px;border:1px solid var(--line);border-radius:2px;background:rgba(19,26,58,.45)}
.fold__summary{display:flex;align-items:flex-start;gap:14px;padding:16px 20px;font-size:16px;font-weight:700;color:var(--light);list-style:none}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"＋";margin-left:auto;font-family:var(--font-mono);font-weight:400;color:var(--cyan)}
.fold[open] .fold__summary::after{content:"－"}
.fold__body{padding:16px 20px 20px;border-top:1px solid var(--line);font-size:15px;color:var(--text)}
.fold__body p+p{margin-top:.8em}
.anchor-nav{position:sticky;top:132px;display:grid;gap:2px}
.anchor-nav a{display:block;padding:9px 13px;border-left:1px solid var(--line);font-size:13px;color:var(--muted);transition:color .16s var(--ease),border-color .16s var(--ease)}
.anchor-nav a:hover{color:var(--text)}
.anchor-nav a[aria-current]{color:var(--cyan);border-left-color:var(--cyan)}
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .42s var(--ease),transform .42s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1199px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:1119px){
  .brand-line{display:none}
  .header-cta{display:none}
}
@media (max-width:1023px){
  .grid--7-3,.grid--5-3-3{grid-template-columns:1fr}
  .anchor-nav{position:static;top:auto}
}
@media (max-width:959px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    max-height:0;overflow:hidden;visibility:hidden;
    border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    background:linear-gradient(180deg,rgba(19,26,58,.99),rgba(7,7,12,.99));
    transition:max-height .3s var(--ease),visibility .3s var(--ease);
  }
  .site-nav__list{display:grid;gap:0;padding:10px var(--gutter) 18px}
  .site-nav__item+.site-nav__item{border-top:1px solid var(--line)}
  .site-nav__link{padding:15px 2px;font-size:15px;border:0;border-radius:0}
  .site-nav__link[aria-current="page"]{border:0;background:var(--cyan-soft)}
  .site-header[data-open] .site-nav{max-height:min(72vh,540px);overflow-y:auto;visibility:visible}
}
@media (max-width:767px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .status-strip__meta{display:none}
  .header-band__inner{gap:14px}
  .footer-links{grid-template-columns:1fr 1fr}
  .footer-note{max-width:none}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr}
  .footer-base__inner{gap:10px}
  .to-top{margin-left:0}
}

/* ---------- 15. 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}
  [data-reveal]{opacity:1;transform:none}
}