/* ===== OG视讯厅 · 共享样式 /assets/site.css ===== */

/* ---------- 1. tokens ---------- */
:root{
  --void:#05091A;
  --panel:#0C1733;
  --line:#1D3560;
  --cyan:#33F2E3;
  --cyan-deep:#0E9B96;
  --orange:#FF7C33;
  --gold:#C9A15C;
  --warmgray:#8B8375;
  --text:#E9F1FF;
  --muted:#9BB0CF;
  --ink:#04121A;
  --font-sans:"PingFang SC","Noto Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1340px;
  --gutter:clamp(16px,4vw,44px);
  --header-h:68px;
  --rail-w:264px;
  --radius:18px;
  --radius-sm:12px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.32s;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:clip}
html.og-lock,html.og-lock body{overflow:hidden}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--void);
  background-image:
    radial-gradient(920px 520px at 78% -8%, rgba(51,242,227,.10), transparent 68%),
    radial-gradient(760px 460px at 2% 8%, rgba(255,124,51,.07), transparent 70%),
    radial-gradient(1040px 620px at 50% 118%, rgba(14,155,150,.13), transparent 72%);
  background-attachment:fixed;
}
h1,h2,h3,h4,h5{font-weight:900;line-height:1.15;letter-spacing:.02em;margin:0}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3vw,2.25rem)}
h3{font-size:clamp(1.15rem,2vw,1.5rem)}
p,ul,ol,figure,blockquote,dl{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
strong{font-weight:800}
::selection{background:rgba(51,242,227,.32);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

/* ---------- 3. 通用排版与布局 ---------- */
.container{width:min(calc(100% - var(--gutter) * 2),var(--wrap));margin-inline:auto}
.section{padding-block:clamp(44px,6.5vw,92px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:clamp(20px,3vw,36px)}
.section__title{font-size:clamp(1.6rem,3vw,2.35rem)}
.section__lead{color:var(--muted);font-size:16px;max-width:46ch}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--cyan);opacity:.8}
.divider{height:1px;border:0;margin-block:clamp(24px,4vw,48px);background:linear-gradient(90deg,var(--line),rgba(29,53,96,0))}
.og-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.prose{max-width:38em}
.prose p+p{margin-top:1em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(51,242,227,.4)}

.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.panel{
  padding:clamp(18px,2.6vw,28px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(12,23,51,.94),rgba(12,23,51,.62));
}

.with-rail{display:grid;grid-template-columns:var(--rail-w) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:start}
.rail{position:sticky;top:calc(var(--header-h) + 20px);display:flex;flex-direction:column;gap:12px}

/* ---------- 4. 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border-radius:999px;border:1px solid transparent;
  font-weight:800;font-size:15px;letter-spacing:.02em;line-height:1;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--orange);color:#0A0F1F;box-shadow:0 12px 30px rgba(255,124,51,.25)}
.btn--primary:hover{background:#FF9457;box-shadow:0 16px 36px rgba(255,124,51,.34)}
.btn--ghost{border-color:rgba(51,242,227,.45);color:var(--cyan);background:rgba(51,242,227,.07)}
.btn--ghost:hover{background:rgba(51,242,227,.16);border-color:var(--cyan)}
.btn--legacy{border-color:rgba(201,161,92,.6);color:var(--gold);background:rgba(201,161,92,.1)}
.btn--legacy:hover{background:var(--gold);color:#150F08;border-color:var(--gold)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:999px;font-family:var(--font-mono);font-size:12px;line-height:1.6;background:rgba(51,242,227,.1);color:var(--cyan);border:1px solid rgba(51,242,227,.35)}
.tag--orange{background:rgba(255,124,51,.12);color:var(--orange);border-color:rgba(255,124,51,.4)}
.tag--gold{background:rgba(201,161,92,.12);color:var(--gold);border-color:rgba(201,161,92,.4)}

/* ---------- 5. 面包屑 ---------- */
.breadcrumb{padding-block:clamp(14px,2vw,22px)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;color:var(--muted)}
.breadcrumb__link{color:var(--muted);border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.breadcrumb__link:hover{color:var(--cyan);border-color:rgba(51,242,227,.5)}
.breadcrumb__sep{color:rgba(155,176,207,.45)}
.breadcrumb__current{color:var(--text)}

/* ---------- 6. 图片容器（页面阶段放图） ---------- */
.media{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16/9;
  border:1px solid var(--line);border-radius:var(--radius);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(51,242,227,.18), transparent 60%),
    radial-gradient(90% 82% at 92% 100%, rgba(255,124,51,.14), transparent 66%),
    linear-gradient(160deg,#0C1733,#070D1F);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:4/5}
.media__img,.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background-image:repeating-linear-gradient(0deg, rgba(233,241,255,.05) 0 1px, transparent 1px 4px);
}
.media__cap{margin-top:10px;font-family:var(--font-mono);font-size:12px;color:var(--muted)}

/* ---------- 7. 头部 ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:-120px;z-index:120;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--cyan);color:var(--ink);font-weight:800;font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

.og-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg, rgba(5,9,26,.97), rgba(5,9,26,.9));
  border-bottom:1px solid var(--line);
}
.og-header::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg, rgba(29,53,96,.45) 0 1px, transparent 1px 72px);
  opacity:.5;
}
.og-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;z-index:2;pointer-events:none}
.og-progress__bar{
  display:block;width:100%;height:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan-deep),var(--cyan) 55%,var(--orange));
}

.og-header__inner{
  position:relative;z-index:1;
  display:grid;grid-template-columns:auto auto 1fr auto;align-items:center;
  column-gap:clamp(12px,2vw,32px);
  min-height:var(--header-h);
  padding-block:10px;
}

.og-brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.og-brand__mark{
  display:inline-flex;align-items:center;justify-content:center;flex:none;
  width:38px;height:38px;border-radius:12px;
  font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.04em;
  color:var(--cyan);background:rgba(51,242,227,.1);border:1px solid rgba(51,242,227,.4);
}
.og-brand__text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.og-brand__name{font-weight:900;font-size:18px;letter-spacing:.04em;white-space:nowrap}
.og-brand__sub{font-family:var(--font-mono);font-size:11px;color:var(--muted);letter-spacing:.06em;white-space:nowrap}

/* 频道锚点：顶栏第二格 */
.og-channel{position:relative;flex:none}
.og-channel__btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:8px 14px;border-radius:14px;text-align:left;
  background:linear-gradient(120deg, rgba(51,242,227,.14), rgba(12,23,51,.92) 62%);
  border:1px solid rgba(51,242,227,.55);
  box-shadow:0 0 0 1px rgba(51,242,227,.1), 0 0 22px rgba(51,242,227,.18);
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.og-channel__btn:hover,
.og-channel[data-open] .og-channel__btn{
  border-color:var(--cyan);
  box-shadow:0 0 0 1px rgba(51,242,227,.28), 0 0 30px rgba(51,242,227,.36);
}
.og-channel__dot{
  flex:none;width:8px;height:8px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 10px rgba(51,242,227,.9);
  animation:og-pulse 2.6s infinite;
}
@keyframes og-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(51,242,227,.55)}
  70%{box-shadow:0 0 0 8px rgba(51,242,227,0)}
}
.og-channel__label{display:flex;flex-direction:column;line-height:1.2}
.og-channel__kicker{font-size:10px;letter-spacing:.18em;color:var(--muted)}
.og-channel__current{font-family:var(--font-mono);font-size:13px;color:var(--cyan);white-space:nowrap}
.og-channel__chev{
  flex:none;width:0;height:0;margin-left:2px;
  border-left:5px solid transparent;border-right:5px solid transparent;border-top:6px solid var(--cyan);
  transition:transform var(--dur) var(--ease);
}
.og-channel[data-open] .og-channel__chev{transform:rotate(180deg)}
.og-channel__panel{
  position:absolute;top:calc(100% + 12px);left:0;z-index:90;
  width:min(440px, calc(100vw - 32px));
  padding:16px;border:1px solid var(--line);border-radius:16px;
  background:linear-gradient(180deg,#0C1733,#070E22);
  box-shadow:0 26px 60px rgba(0,0,0,.6), 0 0 0 1px rgba(51,242,227,.12);
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
}
.og-channel[data-open] .og-channel__panel{opacity:1;visibility:visible;transform:none}
.og-channel__hint{font-size:13px;color:var(--muted);margin-bottom:12px}
.og-channel__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.og-channel__item{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:10px 12px;border-radius:10px;border:1px solid transparent;
  color:var(--muted);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.og-channel__item:hover{background:rgba(51,242,227,.08);color:var(--text);border-color:rgba(51,242,227,.3)}
.og-channel__item[aria-pressed="true"]{background:rgba(51,242,227,.13);color:var(--cyan);border-color:rgba(51,242,227,.5)}
.og-channel__num{font-family:var(--font-mono);font-size:12px;opacity:.85}
.og-channel__name{font-weight:800;font-size:14px}
.og-channel__foot{
  margin-top:12px;padding-top:12px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11px;color:var(--muted);letter-spacing:.06em;
}

/* 栏目索引 */
.og-nav{justify-self:end;min-width:0}
.og-nav__head{display:none}
.og-nav__list{display:flex;align-items:center;gap:clamp(10px,1.3vw,22px)}
.og-nav__item{display:block}
.og-nav__link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 2px;font-size:15px;font-weight:800;color:var(--muted);
  transition:color var(--dur) var(--ease);
}
.og-nav__text{white-space:nowrap}
.og-nav__idx{font-family:var(--font-mono);font-size:11px;color:rgba(155,176,207,.55);transition:color var(--dur) var(--ease)}
.og-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:0 50%;
  transition:transform var(--dur) var(--ease);
}
.og-nav__link:hover{color:var(--text)}
.og-nav__link:hover::after{transform:scaleX(1)}
.og-nav__link[aria-current="page"]{color:var(--cyan)}
.og-nav__link[aria-current="page"]::after{transform:scaleX(1);background:linear-gradient(90deg,var(--cyan),var(--orange))}
.og-nav__link[aria-current="page"] .og-nav__idx{color:var(--orange)}
.og-nav__meta{font-family:var(--font-mono);font-size:12px;color:var(--cyan)}

/* 移动端按钮与遮罩 */
.og-nav-toggle{
  display:none;align-items:center;gap:8px;flex:none;
  padding:9px 12px;border:1px solid var(--line);border-radius:12px;
  background:rgba(12,23,51,.8);color:var(--text);font-weight:800;font-size:13px;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.og-nav-toggle:hover{border-color:rgba(51,242,227,.5);color:var(--cyan)}
.og-nav-toggle__bars{display:grid;gap:4px;width:16px}
.og-nav-toggle__bar{display:block;height:2px;border-radius:2px;background:var(--cyan);transition:transform .25s var(--ease)}
.og-nav-toggle[aria-expanded="true"] .og-nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.og-nav-toggle[aria-expanded="true"] .og-nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.og-nav-toggle__text{line-height:1}

.og-scrim{
  position:fixed;inset:0;z-index:70;
  background:rgba(5,9,26,.72);
  opacity:0;visibility:hidden;
  transition:opacity var(--dur) var(--ease),visibility var(--dur) linear;
}
.og-scrim[data-open]{opacity:1;visibility:visible}

/* ---------- 8. 页脚 ---------- */
.og-footer{
  position:relative;
  margin-top:clamp(56px,9vw,140px);
  border-top:1px solid var(--line);
  background:
    radial-gradient(720px 380px at 10% 0%, rgba(51,242,227,.09), transparent 70%),
    radial-gradient(620px 340px at 92% 8%, rgba(201,161,92,.08), transparent 72%),
    linear-gradient(180deg, rgba(12,23,51,.82), rgba(5,9,26,1) 72%);
}
.og-footer::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg, rgba(29,53,96,.4) 0 1px, transparent 1px 6px);
  opacity:.35;
}
.og-footer__inner{position:relative;z-index:1;padding-block:clamp(36px,6vw,72px) 0}
.og-footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.6fr;gap:clamp(20px,3vw,44px)}
.og-footer__col{min-width:0}
.og-footer__col--brand{max-width:38ch}
.og-footer__name{font-size:22px;font-weight:900;letter-spacing:.04em}
.og-footer__desc{margin-top:10px;color:var(--muted);font-size:15px}
.og-footer__stamp{margin-top:14px;font-size:13px;color:var(--muted)}
.og-footer__update{
  margin-top:8px;font-family:var(--font-mono);font-size:12px;line-height:1.7;
  color:var(--orange);letter-spacing:.02em;
}
.og-footer__title{
  font-size:13px;font-weight:900;letter-spacing:.16em;color:var(--text);
  padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line);
}
.og-footer__list{display:flex;flex-direction:column;gap:10px}
.og-footer__link{
  display:inline-block;font-size:15px;color:var(--muted);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.og-footer__link:hover{color:var(--cyan);border-color:rgba(51,242,227,.5);transform:translateX(3px)}
.og-footer__contact{display:flex;flex-direction:column;gap:12px}
.og-footer__contact-line{display:flex;flex-direction:column;gap:2px}
.og-footer__contact-key{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:rgba(155,176,207,.75)}
.og-footer__contact-val{font-size:14px;color:var(--text);word-break:break-word}
.og-footer__note{margin-top:14px;font-size:13px;color:var(--warmgray)}

.og-legacy{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;
  margin-top:clamp(30px,4.5vw,52px);padding:clamp(18px,2.4vw,26px);
  border:1px solid rgba(201,161,92,.38);border-radius:var(--radius);
  background:linear-gradient(100deg, rgba(201,161,92,.14), rgba(139,131,117,.06) 56%, rgba(5,9,26,0));
}
.og-legacy__body{padding-left:14px;border-left:2px solid var(--gold)}
.og-legacy__title{font-size:15px;font-weight:900;letter-spacing:.1em;color:var(--gold)}
.og-legacy__desc{margin-top:4px;font-size:14px;color:var(--warmgray)}
.og-legacy__cta{flex:none}

.og-footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:clamp(28px,4vw,48px);padding-block:22px;
  border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}
.og-footer__meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.og-footer__icp{font-family:var(--font-mono);color:var(--text)}
.og-footer__sep{color:rgba(155,176,207,.4)}
.og-footer__copy{font-size:12px;color:var(--muted)}

/* ---------- 9. 显现动效 ---------- */
html.js-reveal [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
html.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 10. 平板 ---------- */
@media (max-width:1080px){
  .og-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .og-footer__col--brand{grid-column:1 / -1;max-width:none}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 11. 移动端：左侧抽屉 ---------- */
@media (max-width:1024px){
  .og-header__inner{grid-template-columns:auto 1fr auto;column-gap:12px}
  .og-nav-toggle{display:inline-flex}
  .og-nav{
    position:fixed;top:0;left:0;bottom:0;z-index:80;
    width:min(86vw,340px);
    display:flex;flex-direction:column;gap:16px;
    padding:calc(var(--header-h) + 22px) 20px 34px;
    background:linear-gradient(180deg,#0C1733,#070E22);
    border-right:1px solid var(--line);
    box-shadow:26px 0 60px rgba(0,0,0,.55);
    overflow-y:auto;
    transform:translateX(-104%);
    transition:transform .34s var(--ease);
  }
  .og-nav[data-open]{transform:translateX(0)}
  .og-nav__head{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding-bottom:12px;border-bottom:1px solid var(--line);
  }
  .og-nav__headline{font-size:13px;font-weight:900;letter-spacing:.16em}
  .og-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .og-nav__link{
    justify-content:flex-start;width:100%;
    padding:14px 12px;border-radius:10px;font-size:16px;
    border-bottom:1px solid rgba(29,53,96,.6);
  }
  .og-nav__link::after{display:none}
  .og-nav__link[aria-current="page"]{
    background:rgba(51,242,227,.09);
    box-shadow:inset 3px 0 0 var(--cyan);
  }
  .og-channel__panel{
    position:fixed;top:78px;left:var(--gutter);right:var(--gutter);
    width:auto;
  }
  .with-rail{grid-template-columns:1fr}
  .rail{position:static}
}

@media (max-width:640px){
  .og-footer__grid{grid-template-columns:1fr}
  .og-legacy{flex-direction:column;align-items:flex-start}
  .og-legacy__cta{width:100%}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .og-channel__list{grid-template-columns:1fr}
}

@media (max-width:520px){
  .og-brand__text{display:none}
  .og-header__inner{column-gap:8px}
  .og-channel__btn{padding:8px 10px;gap:8px}
  .og-channel__kicker{display:none}
  .og-channel__current{font-size:12px}
  .og-nav-toggle{padding:9px 10px}
  .og-nav-toggle__text{display:none}
}

/* ---------- 12. 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;
    transition-delay:0ms !important;
  }
  html.js-reveal [data-reveal]{opacity:1;transform:none}
  .btn:hover,.og-footer__link:hover{transform:none}
}