/* ============================================================
   OG视讯厅 · /assets/site.css
   深夜控制室外壳：reset / 变量 / 排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,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}

:root{
  /* 品牌色板 */
  --og-void:#060A16;
  --og-panel:#0E1730;
  --og-glass:#16223E;
  --og-cyan:#25E6D0;
  --og-cyan-lift:#4BF0DD;
  --og-orange:#FF8A3D;
  --og-violet:#8E6BFF;
  --og-violet-soft:#C79CFF;
  --og-paper:#F2E9DB;
  --og-ink:#EDF1FA;
  --og-ink-soft:#C8D3EA;
  --og-ink-dim:#9DAAC8;
  --og-rule:#26314F;
  --og-deep:#080C16;

  /* 结构 */
  --og-shell:1240px;
  --og-gutter:clamp(18px,4vw,48px);
  --og-radius:20px;
  --og-radius-lg:26px;

  /* 字体 */
  --og-font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --og-font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  /* 动效 */
  --og-ease:cubic-bezier(.22,.61,.36,1);
  --og-fast:140ms;
  --og-base:200ms;
}

body{
  min-height:100%;
  font-family:var(--og-font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  color:var(--og-ink);
  background-color:var(--og-void);
  background-image:
    repeating-linear-gradient(to right,rgba(157,170,200,.045) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(to bottom,rgba(157,170,200,.035) 0 1px,transparent 1px 96px),
    radial-gradient(1200px 620px at 78% -6%,rgba(37,230,208,.10),transparent 62%),
    radial-gradient(900px 520px at 4% 10%,rgba(142,107,255,.11),transparent 64%);
  background-attachment:fixed,fixed,fixed,fixed;
  overflow-x:hidden;
}
@media (min-width:1024px){
  body{font-size:17px}
}
::selection{background:rgba(37,230,208,.3);color:#fff}

:focus-visible{
  outline:2px solid var(--og-cyan);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------------- 排版 ---------------- */
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.22;color:var(--og-ink)}
h1{font-size:clamp(30px,5vw,52px)}
h2{font-size:clamp(24px,3.4vw,36px)}
h3{font-size:clamp(19px,2.2vw,25px)}
h4{font-size:clamp(16px,1.5vw,18px);letter-spacing:0;line-height:1.4}

.og-mono{
  font-family:var(--og-font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}

.og-prose{
  max-width:34em;
  font-size:1rem;
  line-height:1.9;
  color:var(--og-ink-soft);
}
.og-prose p+p{margin-top:1.05em}
.og-prose strong{color:var(--og-ink);font-weight:700}
.og-prose a{color:var(--og-cyan);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.og-prose a:hover{color:var(--og-cyan-lift)}
.og-prose ul{margin-top:.8em;display:grid;gap:.45em}
.og-prose ul li{position:relative;padding-left:1.1em}
.og-prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:1.5px;background:var(--og-cyan)}

.og-note{
  max-width:24em;
  font-size:13px;
  line-height:1.8;
  color:var(--og-ink-dim);
}
.og-note strong{color:var(--og-ink-soft)}

.og-rule{
  height:1px;
  border:0;
  background:var(--og-rule);
  margin-block:clamp(24px,3.4vw,44px);
}

/* ---------------- 内容骨架 ---------------- */
.og-main{
  display:block;
  padding:clamp(28px,5vw,64px) var(--og-gutter) clamp(56px,8vw,110px);
}
.og-shell{
  width:100%;
  max-width:var(--og-shell);
  margin:0 auto;
}

.og-section{
  position:relative;
  padding-block:clamp(26px,3.6vw,52px);
}
.og-section + .og-section{border-top:1px solid rgba(38,49,79,.55)}

.og-eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
  font-family:var(--og-font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.24em;
  color:var(--og-ink-dim);
}
.og-eyebrow::before{
  content:"";
  width:18px;
  height:1.5px;
  background:var(--og-rule);
  transition:background var(--og-base) var(--og-ease),box-shadow var(--og-base) var(--og-ease);
}
.og-section[data-active="true"] > .og-eyebrow{color:var(--og-cyan)}
.og-section[data-active="true"] > .og-eyebrow::before{
  background:var(--og-cyan);
  box-shadow:0 0 12px rgba(37,230,208,.85);
}

.og-grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.2vw,32px);
}
.og-span-3{grid-column:span 3}
.og-span-4{grid-column:span 4}
.og-span-5{grid-column:span 5}
.og-span-6{grid-column:span 6}
.og-span-7{grid-column:span 7}
.og-span-8{grid-column:span 8}
.og-span-9{grid-column:span 9}
.og-span-12{grid-column:span 12}

/* ---------------- 面板与纸面 ---------------- */
.og-panel{
  padding:clamp(22px,3vw,40px);
  border:1px solid var(--og-rule);
  border-radius:var(--og-radius-lg);
  background:linear-gradient(165deg,rgba(22,34,62,.62),rgba(14,23,48,.86));
}
.og-slab{
  position:relative;
  padding:clamp(20px,2.6vw,32px);
  border:1px solid var(--og-rule);
  border-radius:var(--og-radius);
  background:linear-gradient(160deg,rgba(22,34,62,.72),rgba(14,23,48,.88));
}
.og-slab--paper{
  border-color:rgba(8,12,22,.14);
  background:var(--og-paper);
  color:var(--og-deep);
}
.og-slab--paper h2,.og-slab--paper h3,.og-slab--paper h4{color:var(--og-deep)}
.og-slab--paper p{color:#39415A}
.og-slab--paper .og-note{color:#4B5570}

/* ---------------- 标签 ---------------- */
.og-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--og-font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.6;
  white-space:nowrap;
}
.og-tag--cyan{color:var(--og-cyan)}
.og-tag--orange{color:var(--og-orange)}
.og-tag--violet{color:var(--og-violet-soft)}
.og-tag--muted{color:var(--og-ink-dim)}

/* ---------------- 按钮 ---------------- */
.og-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  line-height:1.4;
  transition:transform var(--og-fast) var(--og-ease),box-shadow var(--og-fast) var(--og-ease),
             background-color var(--og-fast) var(--og-ease),border-color var(--og-fast) var(--og-ease),
             color var(--og-fast) var(--og-ease);
}
.og-btn--signal{background:var(--og-cyan);color:var(--og-deep)}
.og-btn--signal:hover{background:var(--og-cyan-lift);transform:translateY(-2px);box-shadow:0 14px 30px -16px rgba(37,230,208,.9)}
.og-btn--warm{background:var(--og-orange);color:#1A0C03}
.og-btn--warm:hover{background:#FF9E5E;transform:translateY(-2px);box-shadow:0 14px 30px -16px rgba(255,138,61,.9)}
.og-btn--ghost{border-color:rgba(157,170,200,.35);background:rgba(22,34,62,.5);color:var(--og-ink)}
.og-btn--ghost:hover{border-color:var(--og-cyan);color:var(--og-cyan);transform:translateY(-2px)}

/* ---------------- 面包屑 ---------------- */
.og-breadcrumb{margin-bottom:clamp(18px,2.4vw,32px)}
.og-breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--og-font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--og-ink-dim);
}
.og-breadcrumb__list li+li::before{content:"/";margin-right:8px;color:var(--og-rule)}
.og-breadcrumb__link{transition:color var(--og-fast) var(--og-ease)}
.og-breadcrumb__link:hover{color:var(--og-cyan)}
.og-breadcrumb__current{color:var(--og-ink)}

/* ---------------- 图片容器 ---------------- */
.og-media{
  display:block;
  overflow:hidden;
  border:1px solid var(--og-rule);
  border-radius:var(--og-radius);
  background:linear-gradient(150deg,#0E1730,#060A16);
}
.og-media__frame{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
}
.og-media__frame--wide{aspect-ratio:21/9}
.og-media__frame--tall{aspect-ratio:4/5}
.og-media__frame--square{aspect-ratio:1/1}
.og-media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06);
}
.og-media__caption{
  display:block;
  padding:11px 16px;
  border-top:1px solid var(--og-rule);
  font-family:var(--og-font-mono);
  font-size:12px;
  letter-spacing:.03em;
  color:var(--og-ink-dim);
}

/* ============================================================
   页头
   ============================================================ */
.og-header{
  position:sticky;
  top:0;
  z-index:60;
  padding:12px var(--og-gutter) 0;
  transition:padding var(--og-base) var(--og-ease);
}
.og-header[data-scrolled="true"]{padding-top:6px}

.og-skip{
  position:absolute;
  left:12px;
  top:-200px;
  z-index:200;
  padding:12px 20px;
  border-radius:0 0 14px 14px;
  background:var(--og-cyan);
  color:var(--og-deep);
  font-size:14px;
  font-weight:700;
  transition:top var(--og-fast) var(--og-ease);
}
.og-skip:focus{top:0}

.og-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:80;
  background:rgba(38,49,79,.55);
  pointer-events:none;
}
.og-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--og-cyan) 0%,var(--og-violet) 58%,var(--og-violet-soft) 100%);
  transition:width var(--og-base) linear;
}

.og-header__shell{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  width:100%;
  max-width:var(--og-shell);
  margin:0 auto;
  padding:9px 10px 9px 16px;
  border:1px solid rgba(37,230,208,.16);
  border-radius:999px;
  background:rgba(22,34,62,.68);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  backdrop-filter:blur(18px) saturate(150%);
  box-shadow:0 20px 50px -30px rgba(0,0,0,.95),inset 0 1px 0 rgba(237,241,250,.07);
  transition:background-color var(--og-base) var(--og-ease),border-color var(--og-base) var(--og-ease),
             padding var(--og-base) var(--og-ease),box-shadow var(--og-base) var(--og-ease);
}
.og-header[data-scrolled="true"] .og-header__shell{
  padding-top:5px;
  padding-bottom:5px;
  background:rgba(14,23,48,.9);
  border-color:rgba(37,230,208,.3);
  box-shadow:0 24px 54px -30px rgba(0,0,0,1),inset 0 1px 0 rgba(237,241,250,.09);
}

/* 品牌 */
.og-brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  padding:2px 4px 2px 0;
}
.og-brand__pulse{
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--og-cyan);
  box-shadow:0 0 0 0 rgba(37,230,208,.55);
  animation:og-pulse 2.6s var(--og-ease) infinite;
}
@keyframes og-pulse{
  0%,100%{box-shadow:0 0 0 0 rgba(37,230,208,.5);opacity:1}
  50%{box-shadow:0 0 0 9px rgba(37,230,208,0);opacity:.72}
}
.og-brand__text{display:flex;flex-direction:column;line-height:1.14}
.og-brand__name{font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--og-ink)}
.og-brand__sub{
  font-family:var(--og-font-mono);
  font-size:10px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--og-ink-dim);
}

/* 导航 */
.og-nav{margin-left:auto}
.og-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.og-nav__link{
  display:inline-flex;
  align-items:center;
  padding:8px 14px;
  border-radius:999px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--og-ink-dim);
  white-space:nowrap;
  transition:color var(--og-fast) var(--og-ease),background-color var(--og-fast) var(--og-ease);
}
.og-nav__link:hover{color:var(--og-ink);background:rgba(37,230,208,.10)}
.og-nav__link[aria-current="page"]{
  color:var(--og-deep);
  background:var(--og-cyan);
  box-shadow:0 0 18px -4px rgba(37,230,208,.6);
}

/* 主行动按钮 */
.og-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  flex:0 0 auto;
  padding:10px 18px;
  border-radius:999px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--og-deep);
  background:var(--og-cyan);
  transition:background-color var(--og-fast) var(--og-ease),transform var(--og-fast) var(--og-ease),
             box-shadow var(--og-fast) var(--og-ease);
}
.og-cta:hover{
  background:var(--og-cyan-lift);
  transform:translateY(-1px);
  box-shadow:0 10px 26px -12px rgba(37,230,208,.8);
}

/* 移动端按钮 */
.og-nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:9px 14px;
  border:1px solid rgba(37,230,208,.3);
  border-radius:999px;
  background:rgba(37,230,208,.08);
  color:var(--og-ink);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
}
.og-nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.og-nav-toggle__bars span{
  display:block;
  height:1.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform var(--og-base) var(--og-ease),opacity var(--og-base) var(--og-ease);
}
.og-nav-toggle[aria-expanded="true"] .og-nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.og-nav-toggle[aria-expanded="true"] .og-nav-toggle__bars span:nth-child(2){opacity:0}
.og-nav-toggle[aria-expanded="true"] .og-nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

@media (max-width:1099px){
  .og-cta{display:none}
}
@media (max-width:1023px){
  .og-nav-toggle{display:inline-flex}
  .og-nav{
    position:fixed;
    top:78px;
    left:var(--og-gutter);
    right:var(--og-gutter);
    z-index:70;
    margin-left:0;
    max-height:calc(100vh - 108px);
    overflow-y:auto;
    padding:12px;
    border:1px solid rgba(37,230,208,.22);
    border-radius:22px;
    background:rgba(14,23,48,.97);
    box-shadow:0 34px 70px -34px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity var(--og-base) var(--og-ease),transform var(--og-base) var(--og-ease),
               visibility var(--og-base) var(--og-ease);
  }
  .og-nav[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .og-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .og-nav__link{justify-content:flex-start;padding:12px 14px;border-radius:14px;font-size:16px}
}
@media (max-width:600px){
  .og-header__shell{padding:8px 8px 8px 14px}
  .og-brand__sub{display:none}
}

/* ============================================================
   页脚
   ============================================================ */
.og-footer{
  margin-top:clamp(40px,6vw,88px);
  padding:clamp(36px,5vw,68px) var(--og-gutter) clamp(22px,3vw,34px);
  border-top:1px solid var(--og-rule);
  background:linear-gradient(180deg,rgba(14,23,48,.72),rgba(6,10,22,.96));
}
.og-footer__shell{
  width:100%;
  max-width:var(--og-shell);
  margin:0 auto;
}
.og-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.4fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,3.4vw,56px);
}
@media (max-width:900px){
  .og-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 28px}
}
@media (max-width:560px){
  .og-footer__grid{grid-template-columns:minmax(0,1fr)}
}

.og-footer__brand{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.og-footer__brand-mark{
  width:22px;
  height:3px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--og-cyan),var(--og-violet-soft));
}
.og-footer__brand-name{font-size:19px;font-weight:800;letter-spacing:-.01em;color:var(--og-ink)}
.og-footer__tagline{
  max-width:32em;
  font-size:14.5px;
  line-height:1.85;
  color:var(--og-ink-dim);
}

.og-footer__contact{display:grid;gap:10px;margin-top:20px}
.og-contact-line{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 12px;
  font-size:13.5px;
}
.og-contact-line__key{
  min-width:62px;
  font-family:var(--og-font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--og-ink-dim);
}
.og-contact-line__val{color:var(--og-ink-soft)}

.og-copy{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:4px 11px;
  border:1px dashed rgba(37,230,208,.42);
  border-radius:999px;
  font-family:var(--og-font-mono);
  font-size:13.5px;
  color:var(--og-cyan);
  transition:background-color var(--og-fast) var(--og-ease),border-color var(--og-fast) var(--og-ease);
}
.og-copy:hover{background:rgba(37,230,208,.1);border-style:solid}
.og-copy__text{letter-spacing:.01em}
.og-copy__hint{
  font-family:var(--og-font-sans);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--og-ink-dim);
}

.og-footer__title{
  margin-bottom:14px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--og-ink-dim);
}
.og-footer__list{display:grid;gap:9px}
.og-footer__link{
  display:inline-block;
  font-size:14.5px;
  color:var(--og-ink-soft);
  transition:color var(--og-fast) var(--og-ease),transform var(--og-fast) var(--og-ease);
}
.og-footer__link:hover{color:var(--og-cyan);transform:translateX(3px)}

.og-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(28px,4vw,48px);
  padding-top:18px;
  border-top:1px solid var(--og-rule);
  font-size:12.5px;
  color:var(--og-ink-dim);
}
.og-footer__legal{font-family:var(--og-font-mono);letter-spacing:.04em}
.og-footer__meta{color:var(--og-ink-dim)}

/* ============================================================
   响应式网格兜底
   ============================================================ */
@media (max-width:900px){
  .og-grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .og-span-3,.og-span-4,.og-span-5,.og-span-6,.og-span-7,.og-span-8,.og-span-9,.og-span-12{
    grid-column:1 / -1;
  }
}

/* ============================================================
   动效偏好
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .og-brand__pulse{box-shadow:none}
}