/* ===== OK看台 · 共享样式 /assets/site.css ===== */

/* 1. 变量 */
:root{
  --night:#0B1B2B;
  --pine:#0F2A23;
  --panel:#16352E;
  --orange:#FF6A2A;
  --cyan:#43D9C6;
  --paper:#F7F2E8;
  --mist:#A9B8B1;
  --data-light:#D7DED9;
  --data-mid:#6E7F78;
  --veil:rgba(247,242,232,.08);
  --line:rgba(247,242,232,.14);
  --line-soft:rgba(247,242,232,.08);
  --ink-on-light:#0B1B2B;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,serif;
  --font-body:"Noto Sans SC","Inter","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --header-h:78px;
  --wrap:1280px;
  --gutter:clamp(20px,4vw,56px);
  --r-panel:32px;
  --r-card:20px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* 2. 重置 */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--night);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,picture,svg,video{max-width:100%;display:block}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
main{display:block}
[id]{scroll-margin-top:calc(var(--header-h) + 24px)}
::selection{background:var(--orange);color:#20130A}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
#main-content:focus{outline:none}

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

/* 3. 中文排版与文本组件 */
.display{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(2.4rem,6vw,4.6rem);
  line-height:1.03;
  letter-spacing:-.01em;
}
.display--sm{font-size:clamp(1.9rem,3.6vw,2.9rem)}
.h-serif{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(1.3rem,2vw,1.75rem);
  line-height:1.2;
}
.lead{
  font-size:clamp(1.02rem,1.4vw,1.28rem);
  line-height:1.7;
  color:rgba(247,242,232,.9);
  max-width:58ch;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.6}
.num{
  font-family:var(--font-mono);
  font-feature-settings:"tnum" 1;
  letter-spacing:.06em;
}
.num--accent{color:var(--orange)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  background:var(--veil);border:1px solid var(--line-soft);
  font-size:.72rem;letter-spacing:.08em;color:var(--mist);
}
.tag--accent{background:var(--cyan);color:#06231F;border-color:transparent}
.divider{height:1px;background:var(--line-soft);border:0;margin:0}

/* 4. 布局容器与栅格 */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page-shell{
  padding-top:calc(var(--header-h) + clamp(28px,5vw,64px));
  padding-bottom:clamp(56px,9vw,120px);
}
.section{display:block;padding-block:clamp(48px,7vw,104px)}
.grid{display:grid;gap:clamp(16px,2.5vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* 5. 面板 / 章节 */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:var(--r-panel);
  padding:clamp(22px,3vw,40px);
  overflow:hidden;
}
.panel--flat{background:rgba(247,242,232,.04)}
.chapter{
  position:relative;
  padding-block:clamp(36px,5.5vw,68px);
  border-top:1px solid var(--line-soft);
}
.chapter__index{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(2.2rem,5vw,3.6rem);
  line-height:1;
  letter-spacing:.04em;
  color:rgba(247,242,232,.22);
  transition:color .5s var(--ease);
}
.chapter[data-inview="true"] .chapter__index{color:var(--orange)}

/* 6. 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;
  font-size:.9rem;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;white-space:nowrap;
  transition:transform .2s var(--ease),background .25s var(--ease),
             color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.btn--sm{padding:9px 16px;font-size:.82rem}
.btn--primary{
  background:var(--orange);color:#20130A;
  box-shadow:0 14px 30px -18px rgba(255,106,42,.95);
}
.btn--primary:hover{background:#FF7D45;transform:translateY(-1px)}
.btn--ghost{
  background:var(--veil);color:var(--paper);
  border-color:var(--line);
}
.btn--ghost:hover{
  background:rgba(67,217,198,.14);
  border-color:rgba(67,217,198,.5);
  color:#DFFBF5;
}
.btn--cyan{background:var(--cyan);color:#06231F}
.btn--cyan:hover{background:#68E6D6;transform:translateY(-1px)}

/* 7. 面包屑 */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:.74rem;letter-spacing:.06em;color:var(--mist);
}
.breadcrumbs a:hover{color:var(--paper)}
.breadcrumbs__sep{opacity:.45}
.breadcrumbs [aria-current="page"]{color:var(--cyan)}

/* 8. 图片容器基础规则 */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-card);
  background:linear-gradient(160deg,#16352E 0%,#0B1B2B 100%);
  border:1px solid var(--line-soft);
  isolation:isolate;
}
.media-frame img,
.media-frame picture,
.media-frame video{width:100%;height:100%;object-fit:cover;display:block}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:0;
  background:linear-gradient(180deg,rgba(11,27,43,0) 42%,rgba(11,27,43,.72) 100%);
  pointer-events:none;
}
.media-frame--ratio-16x9{aspect-ratio:16/9}
.media-frame--ratio-4x3{aspect-ratio:4/3}
.media-frame--ratio-1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--tilt{transform:rotate(-1.6deg)}
.media-frame__caption{
  position:absolute;left:16px;right:16px;bottom:14px;z-index:1;
  font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(247,242,232,.86);
}

/* 9. 数据表 */
.data-table{width:100%;font-size:.86rem;border-collapse:collapse}
.data-table th{
  font-family:var(--font-mono);
  font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);text-align:left;font-weight:500;
  padding:0 12px 10px 0;border-bottom:1px solid var(--line);
}
.data-table td{
  padding:12px 12px 12px 0;
  border-bottom:1px solid var(--line-soft);
  vertical-align:baseline;
}
.data-table td.num{color:var(--paper)}
.data-table tr:last-child td{border-bottom:0}
.data-table caption{
  caption-side:bottom;text-align:left;
  font-size:.72rem;color:var(--mist);padding-top:12px;
}

/* 10. 显现协议 */
[data-js="true"] [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity .65s var(--ease),transform .65s var(--ease);
}
[data-js="true"] [data-reveal][data-inview="true"]{opacity:1;transform:none}

/* 11. 跳转链接 */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  background:var(--cyan);color:#06231F;
  font-weight:700;font-size:.86rem;
  padding:10px 20px;border-radius:999px;
  transition:transform .22s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0)}

/* 12. 头部 */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:linear-gradient(180deg,rgba(11,27,43,.88) 0%,rgba(11,27,43,.42) 62%,rgba(11,27,43,0) 100%);
  transition:background .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--line-soft);opacity:0;transition:opacity .3s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(15,42,35,.965);
  box-shadow:0 20px 44px -30px rgba(0,0,0,.95);
  backdrop-filter:blur(14px);
}
.site-header[data-scrolled="true"]::after{opacity:1}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  overflow:hidden;pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--orange) 100%);
  transition:transform .12s linear;
}

.header-inner{
  position:relative;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;
  gap:clamp(14px,2.4vw,36px);
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;border-radius:12px;
  background:var(--orange);color:#20130A;
  font-family:var(--font-mono);font-weight:700;font-size:.84rem;letter-spacing:.06em;
  box-shadow:0 10px 24px -14px rgba(255,106,42,.95);
}
.brand__text{display:flex;flex-direction:column;line-height:1.1}
.brand__name{
  font-family:var(--font-display);
  font-size:1.16rem;font-weight:600;letter-spacing:.06em;color:var(--paper);
}
.brand__tag{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--mist);
}
.brand--footer .brand__mark{width:44px;height:44px;border-radius:14px;font-size:.95rem}
.brand--footer .brand__name{font-size:1.42rem}

/* 主导航 */
.site-nav{
  display:flex;align-items:center;justify-content:center;
  flex:1 1 auto;min-width:0;
}
.site-nav__list{
  display:flex;align-items:center;
  gap:clamp(2px,1.1vw,14px);
}
.site-nav__link{
  position:relative;
  display:inline-flex;align-items:center;
  padding:8px 11px;border-radius:999px;
  font-size:.92rem;color:rgba(247,242,232,.78);
  transition:color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:2px;height:2px;border-radius:2px;
  background:var(--orange);
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .3s var(--ease);
}
.site-nav__link:hover{color:var(--paper);background:var(--veil)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{
  color:var(--paper);
  background:rgba(255,106,42,.14);
  box-shadow:inset 0 0 0 1px rgba(255,106,42,.34);
}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 头部动作区 */
.header-actions{
  display:flex;align-items:center;gap:10px;
  flex:0 0 auto;margin-left:auto;
}
.drawer-toggle__bars{
  display:inline-flex;flex-direction:column;justify-content:center;gap:3px;
  width:14px;
}
.drawer-toggle__bars i{
  display:block;height:2px;border-radius:2px;
  background:currentColor;
  transition:transform .3s var(--ease),width .3s var(--ease);
}
.drawer-toggle__bars i:last-child{width:9px}
.drawer-toggle[aria-expanded="true"] .drawer-toggle__bars i:first-child{transform:translateY(2px)}
.drawer-toggle[aria-expanded="true"] .drawer-toggle__bars i:last-child{width:14px;transform:translateY(-2px)}

.nav-toggle{
  display:none;
  width:44px;height:44px;border-radius:14px;
  align-items:center;justify-content:center;
  border:1px solid var(--line);background:var(--veil);
}
.nav-toggle__box{position:relative;display:block;width:18px;height:12px}
.nav-toggle__box i{
  position:absolute;left:0;right:0;height:2px;border-radius:2px;
  background:var(--paper);
  transition:transform .3s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__box i:nth-child(1){top:0}
.nav-toggle__box i:nth-child(2){top:5px}
.nav-toggle__box i:nth-child(3){top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle__box i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__box i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__box i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 第二栏抽屉 */
.second-column{
  position:absolute;left:0;right:0;top:100%;
  background:rgba(15,42,35,.975);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(16px);
  padding:22px 0 24px;
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s linear;
}
.second-column[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
.second-column__inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
}
.second-column__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 18px;
  margin-bottom:16px;
}
.second-column__hint{font-size:.8rem;color:var(--mist);letter-spacing:.02em}
.second-column__track{
  display:flex;gap:12px;
  overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;
  padding-bottom:10px;
  scrollbar-width:thin;
  scrollbar-color:var(--data-mid) transparent;
}
.second-column__track::-webkit-scrollbar{height:6px}
.second-column__track::-webkit-scrollbar-thumb{background:var(--data-mid);border-radius:999px}

.entry-card{
  flex:0 0 clamp(176px,21vw,228px);
  scroll-snap-align:start;
  display:grid;gap:6px;
  padding:16px 18px 18px;
  border-radius:var(--r-card);
  background:rgba(247,242,232,.05);
  border:1px solid var(--line-soft);
  transition:background .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);
}
.entry-card:hover{
  background:rgba(67,217,198,.1);
  border-color:rgba(67,217,198,.42);
  transform:translateY(-2px);
}
.entry-card__index{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;color:var(--orange);
}
.entry-card__label{
  font-family:var(--font-display);font-size:1.06rem;line-height:1.3;color:var(--paper);
}
.entry-card__desc{font-size:.76rem;line-height:1.55;color:var(--mist)}

/* 13. 页脚 */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,130px);
  background:var(--pine);
  color:var(--paper);
  border-top:1px solid var(--line-soft);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(120% 85% at 8% 0%,rgba(67,217,198,.13) 0%,rgba(67,217,198,0) 58%),
    radial-gradient(95% 70% at 102% 104%,rgba(255,106,42,.14) 0%,rgba(255,106,42,0) 62%);
}
.footer-inner{
  position:relative;z-index:1;
  padding-block:clamp(44px,6.5vw,84px) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr .85fr 1.15fr .75fr;
  gap:clamp(24px,3.6vw,52px);
}
.footer-col{min-width:0}
.footer-col--brand{display:flex;flex-direction:column;gap:14px}
.footer-heading{
  font-family:var(--font-mono);
  font-size:.66rem;font-weight:500;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:16px;
}
.footer-list{display:grid;gap:9px;font-size:.9rem}
.footer-list a{color:rgba(247,242,232,.8);transition:color .2s var(--ease)}
.footer-list a:hover{color:var(--orange)}
.footer-line{
  font-size:.9rem;line-height:1.7;color:rgba(247,242,232,.82);max-width:34ch;
}
.footer-line--muted{
  font-family:var(--font-mono);
  font-size:.72rem;letter-spacing:.04em;color:var(--mist);max-width:36ch;
}
.footer-contact-item{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
  font-size:.88rem;line-height:1.7;color:rgba(247,242,232,.86);
  word-break:break-word;
}
.copy-btn{
  font-family:var(--font-mono);
  font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;
  padding:4px 10px;border-radius:999px;
  border:1px solid var(--line);color:var(--mist);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{color:var(--paper);border-color:rgba(67,217,198,.6);background:rgba(67,217,198,.12)}
.copy-btn[data-copied="true"]{color:#06231F;background:var(--cyan);border-color:var(--cyan)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 24px;
  margin-top:clamp(32px,4.5vw,60px);
  padding-block:22px 26px;
  border-top:1px solid var(--line-soft);
  font-size:.76rem;color:var(--mist);
}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:18px}
.footer-legal a{color:var(--mist);transition:color .2s var(--ease)}
.footer-legal a:hover{color:var(--paper)}
.footer-copy{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em}

/* 14. 响应式 */
@media (max-width:1120px){
  .site-nav__link{padding:8px 8px;font-size:.86rem}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--brand{grid-column:1 / -1}
}

@media (max-width:960px){
  :root{--header-h:66px}
  .nav-toggle{display:flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    background:rgba(15,42,35,.985);
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid var(--line);
    padding:10px var(--gutter) 24px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s linear;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .site-nav__link{
    padding:15px 6px;font-size:1.04rem;border-radius:12px;
    border-bottom:1px solid var(--line-soft);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{box-shadow:none;border-radius:12px}
  .header-actions{gap:8px}
  .drawer-toggle{padding:9px 13px;font-size:.78rem}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:720px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-meta{flex-direction:column;align-items:flex-start}
  .brand__tag{display:none}
  .drawer-toggle .drawer-toggle__bars{display:none}
  .second-column{padding-top:18px}
  .entry-card{flex-basis:78%}
  .panel{border-radius:24px}
}

@media (max-width:420px){
  .brand__name{font-size:1.04rem}
  .brand__mark{width:34px;height:34px;border-radius:10px;font-size:.78rem}
  .nav-toggle{width:40px;height:40px;border-radius:12px}
}

/* 15. 减弱动效 */
@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;
  }
  [data-js="true"] [data-reveal]{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
  .media-frame--tilt{transform:none}
}