/* ==========================================================================
   乐动在线 · 共享样式表  /assets/site.css
   夜间演播控制室基调：深空黑底、信号红焦点、电光青状态、奶油纸出版面
   ========================================================================== */

:root{
  --ink:#0A0C10;
  --ink-2:#17110E;
  --paper:#F3E7D3;
  --white:#EEF2F5;
  --red:#FF3A2E;
  --cyan:#2FE0D0;
  --amber:#FFB43C;
  --brick:#D1531F;
  --gray:#6E7681;
  --teal-ink:#12262B;

  --line:rgba(238,242,245,.12);
  --line-strong:rgba(238,242,245,.26);
  --dim:rgba(238,242,245,.72);
  --dim-2:rgba(238,242,245,.52);

  --radius-lg:28px;
  --radius-md:18px;
  --radius-sm:12px;

  --maxw:1200px;
  --gutter:20px;

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--white);
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 82% -12%, rgba(47,224,208,.10), transparent 65%),
    radial-gradient(760px 460px at 4% 4%, rgba(255,58,46,.10), transparent 62%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

::selection{background:var(--red);color:#fff}

:focus-visible{
  outline:2px solid var(--red);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- 排版工具 ---------- */
.oa-mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.04em}
.oa-strong{color:var(--white);font-weight:700}
.oa-dim{color:var(--dim-2)}

/* ---------- 布局容器 ---------- */
.oa-container{
  width:min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline:auto;
}
.oa-container--narrow{max-width:820px}
.oa-section{padding:clamp(40px,7vw,88px) 0}
.oa-section--tight{padding:clamp(28px,4vw,52px) 0}

.oa-kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--brick);
}
.oa-kicker::before{content:"";width:26px;height:1px;background:currentColor;flex:0 0 auto}
.oa-h2{font-size:clamp(26px,3.6vw,42px);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-top:14px}
.oa-lead{font-size:17px;line-height:1.8;color:var(--dim);max-width:62ch;margin-top:16px}

.oa-grid{display:grid;gap:clamp(18px,2.4vw,28px)}
.oa-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.oa-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.oa-grid--split{grid-template-columns:minmax(0,7fr) minmax(0,3fr);align-items:start}
@media (max-width:900px){
  .oa-grid--3,.oa-grid--split{grid-template-columns:1fr}
}
@media (max-width:720px){
  .oa-grid--2{grid-template-columns:1fr}
}

.oa-rule{
  border:0;height:1px;margin:0;
  background:linear-gradient(90deg,var(--brick),rgba(238,242,245,.10) 68%,transparent);
}

.oa-notes{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--gray);
}

/* ---------- 面板 ---------- */
.oa-panel{
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:rgba(18,38,43,.55);
  padding:clamp(20px,3vw,30px);
}
.oa-panel--flat{background:rgba(238,242,245,.03)}
.oa-panel--paper{
  background-color:var(--paper);
  background-image:radial-gradient(rgba(23,17,14,.14) 1px, transparent 1px);
  background-size:6px 6px;
  color:var(--ink-2);
  border-color:rgba(23,17,14,.16);
}
.oa-panel--paper .oa-panel__title{color:var(--ink-2)}
.oa-panel--paper a{color:var(--brick);text-decoration:underline;text-underline-offset:4px}
.oa-panel--paper a:hover{color:var(--red)}
.oa-panel__head{
  display:flex;flex-wrap:wrap;gap:10px 18px;
  align-items:baseline;justify-content:space-between;
  margin-bottom:18px;
}
.oa-panel__title{font-size:20px;font-weight:700;letter-spacing:-.01em}

/* ---------- 按钮 ---------- */
.oa-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 24px;border-radius:999px;
  border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.01em;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.oa-btn--primary{
  background:var(--red);color:#fff;
  box-shadow:0 12px 34px -16px rgba(255,58,46,.95);
}
.oa-btn--primary:hover{background:#ff5749;transform:translateY(-2px)}
.oa-btn--ghost{border-color:var(--line-strong);color:var(--paper)}
.oa-btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.oa-btn--cyan{border-color:rgba(47,224,208,.5);color:var(--cyan);background:rgba(47,224,208,.07)}
.oa-btn--cyan:hover{background:var(--cyan);color:var(--ink);transform:translateY(-2px)}
.oa-btn--sm{padding:9px 16px;font-size:13px}

/* ---------- 标签 ---------- */
.oa-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  border:1px solid currentColor;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  background:rgba(238,242,245,.03);
  white-space:nowrap;
}
.oa-tag--onair{color:var(--red)}
.oa-tag--cyan{color:var(--cyan)}
.oa-tag--amber{color:var(--amber)}
.oa-tag--brick{color:var(--brick)}
.oa-tag--plain{color:var(--gray)}

/* ---------- 面包屑 ---------- */
.oa-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--gray);
}
.oa-breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.oa-breadcrumb li::after{content:"/";color:var(--brick)}
.oa-breadcrumb li:last-child::after{content:""}
.oa-breadcrumb a{color:var(--gray);transition:color .18s var(--ease)}
.oa-breadcrumb a:hover{color:var(--cyan)}
.oa-breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 图片容器基础规则 ---------- */
.oa-media{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--teal-ink),#0A0C10 68%);
  isolation:isolate;
}
.oa-media > img,
.oa-media > svg,
.oa-media > video,
.oa-media > picture > img{
  width:100%;height:100%;
  object-fit:cover;
  display:block;
}
.oa-media--wide{aspect-ratio:16 / 9}
.oa-media--square{aspect-ratio:1 / 1}
.oa-media--tall{aspect-ratio:3 / 4}
.oa-media--cut{clip-path:polygon(0 0,100% 0,100% 88%,0 100%);border-radius:var(--radius-lg) var(--radius-lg) 0 0}
.oa-media__cap{
  margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--gray);
}

/* ---------- 长文 ---------- */
.oa-prose{max-width:68ch;font-size:17px;line-height:1.85;color:rgba(238,242,245,.86)}
.oa-prose h2{font-size:clamp(22px,2.4vw,28px);font-weight:700;margin:2em 0 .6em;letter-spacing:-.01em}
.oa-prose h3{font-size:19px;font-weight:700;margin:1.6em 0 .5em}
.oa-prose p{margin:0 0 1.1em}
.oa-prose ul{margin:0 0 1.2em;padding-left:1.1em;list-style:disc}
.oa-prose li{margin-bottom:.5em}
.oa-prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:4px}
.oa-prose code{font-family:var(--font-mono);font-size:.9em;background:var(--teal-ink);padding:2px 7px;border-radius:6px}

/* ---------- 显现 ---------- */
.oa-reveal{
  opacity:0;transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.oa-reveal.is-in{opacity:1;transform:none}

/* ---------- 主题筛选 ---------- */
.oa-filter{display:flex;flex-wrap:wrap;gap:8px}
.oa-filter__btn{
  padding:8px 16px;border-radius:999px;
  border:1px solid var(--line-strong);
  background:rgba(238,242,245,.03);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--dim);cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.oa-filter__btn:hover{border-color:var(--cyan);color:var(--cyan)}
.oa-filter__btn[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff}
[data-filter-item].is-in{animation:oa-fadein .24s ease-out both}
@keyframes oa-fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ==========================================================================
   头部：框架式导航
   ========================================================================== */
.oa-skip{
  position:fixed;left:16px;top:-64px;z-index:300;
  padding:10px 18px;border-radius:999px;
  background:var(--red);color:#fff;font-size:14px;font-weight:600;
  transition:top .2s var(--ease);
}
.oa-skip:focus{top:14px}

.oa-header{
  position:sticky;top:0;z-index:120;
  background:rgba(10,12,16,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.oa-topbar{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:12px 22px;
  padding:14px 0 10px;
}

.oa-brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.oa-brand__mark{
  position:relative;width:38px;height:38px;flex:0 0 auto;
  border-radius:12px;background:var(--red);
  box-shadow:0 0 0 5px rgba(255,58,46,.14);
}
.oa-brand__mark::before{
  content:"";position:absolute;inset:12px;border-radius:50%;
  background:#fff;animation:oa-blink 3s ease-in-out infinite;
}
.oa-brand__text{display:flex;flex-direction:column;line-height:1.2}
.oa-brand__name{font-size:19px;font-weight:800;letter-spacing:.05em}
.oa-brand__tag{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--gray);text-transform:uppercase}

.oa-status{
  display:inline-flex;align-items:center;gap:9px;
  flex:1 1 auto;min-width:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--gray);
}
.oa-status__dot{
  width:8px;height:8px;flex:0 0 auto;border-radius:50%;
  background:var(--cyan);
  animation:oa-pulse 2.4s ease-out infinite;
}

.oa-quick{display:flex;flex-wrap:wrap;gap:8px;margin-left:auto}
.oa-quick__link{
  display:inline-block;
  padding:8px 14px;border-radius:999px;
  border:1px solid var(--line-strong);
  background:rgba(238,242,245,.04);
  font-size:13px;color:var(--dim);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.oa-quick__link:hover{
  color:#fff;border-color:var(--red);
  background:rgba(255,58,46,.16);
}

.oa-nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 16px;border-radius:999px;
  border:1px solid var(--line-strong);
  background:rgba(238,242,245,.05);
  font-size:13px;font-weight:600;cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.oa-nav-toggle:hover{border-color:var(--red);background:rgba(255,58,46,.14)}
.oa-nav-toggle__bars{position:relative;display:block;width:16px;height:10px;flex:0 0 auto}
.oa-nav-toggle__bars::before,
.oa-nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:100%;height:2px;border-radius:2px;
  background:var(--red);transition:transform .2s var(--ease),top .2s var(--ease);
}
.oa-nav-toggle__bars::before{top:0}
.oa-nav-toggle__bars::after{top:8px}
.oa-nav-toggle[aria-expanded="true"]{border-color:var(--red)}
.oa-nav-toggle[aria-expanded="true"] .oa-nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.oa-nav-toggle[aria-expanded="true"] .oa-nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

.oa-nav{
  border-top:1px solid rgba(238,242,245,.08);
  background:linear-gradient(180deg,rgba(23,17,14,.65),rgba(10,12,16,0));
}
.oa-nav__list{
  display:flex;align-items:center;gap:4px;
  overflow-x:auto;
  padding:8px 0 10px;
  scrollbar-width:thin;
}
.oa-nav__item{flex:0 0 auto}
.oa-nav__link{
  display:inline-flex;align-items:center;gap:10px;
  padding:10px 16px;border-radius:999px;
  font-size:15px;font-weight:500;color:var(--dim);
  white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.oa-nav__idx{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--gray);transition:color .18s var(--ease);
}
.oa-nav__link:hover{background:rgba(238,242,245,.07);color:#fff}
.oa-nav__link:hover .oa-nav__idx{color:var(--cyan)}
.oa-nav__link[aria-current="page"]{background:var(--paper);color:var(--ink-2);font-weight:700}
.oa-nav__link[aria-current="page"] .oa-nav__idx{color:var(--brick)}

.oa-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--amber) 58%,var(--cyan));
  transition:transform .1s linear;
}

@media (max-width:1080px){
  .oa-quick__link{font-size:12px;padding:7px 12px}
}

@media (max-width:880px){
  .oa-nav-toggle{display:inline-flex;order:1;margin-left:auto}
  .oa-brand__tag{display:none}
  .oa-status{display:none}
  .oa-quick{
    order:2;flex:1 1 100%;margin-left:0;
    flex-wrap:nowrap;overflow-x:auto;
    padding-bottom:4px;
  }
  .oa-nav{display:none}
  .oa-nav[data-open]{
    display:block;
    background:rgba(23,17,14,.98);
    border-top-color:rgba(255,58,46,.42);
  }
  .oa-nav__list{
    flex-direction:column;align-items:stretch;gap:2px;
    padding:12px 0 18px;overflow:visible;
  }
  .oa-nav__item{flex:1 1 auto}
  .oa-nav__link{
    width:100%;justify-content:flex-start;
    font-size:17px;padding:14px 16px;border-radius:14px;
  }
  .oa-nav__link[aria-current="page"]{
    background:rgba(255,58,46,.15);
    color:#fff;
    box-shadow:inset 3px 0 0 var(--red);
  }
  .oa-nav__link[aria-current="page"] .oa-nav__idx{color:var(--red)}
}

/* ==========================================================================
   页脚
   ========================================================================== */
.oa-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-2);
  border-top:1px solid rgba(238,242,245,.08);
}
.oa-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,
    var(--red) 0 20%,
    var(--brick) 20% 38%,
    var(--amber) 38% 54%,
    var(--cyan) 54% 72%,
    var(--teal-ink) 72% 100%);
}

.oa-footer__inner{
  display:grid;
  grid-template-columns:minmax(260px,1.5fr) repeat(3,minmax(120px,1fr));
  gap:34px 28px;
  padding:clamp(42px,6vw,66px) 0 clamp(24px,4vw,36px);
}
.oa-footer__brand{min-width:0}
.oa-footer__logo{font-size:26px;font-weight:800;letter-spacing:-.01em}
.oa-footer__tag{
  margin-top:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--gray);
}
.oa-footer__contact{
  margin-top:18px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;
  color:var(--paper);
  word-break:break-word;
}
.oa-footer__address{
  margin-top:6px;
  font-size:13px;line-height:1.7;color:var(--gray);
  max-width:34ch;
}
.oa-footer__title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.2em;color:var(--brick);text-transform:uppercase;
}
.oa-footer__links li + li{margin-top:10px}
.oa-footer__links a{
  font-size:15px;color:rgba(238,242,245,.78);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.oa-footer__links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.oa-footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  padding:20px 0 30px;
  border-top:1px solid rgba(238,242,245,.1);
}
.oa-footer__copy{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--gray);
}
.oa-footer__legal{display:flex;flex-wrap:wrap;gap:18px}
.oa-footer__legal a{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--gray);transition:color .18s var(--ease);
}
.oa-footer__legal a:hover{color:var(--red)}

@media (max-width:1024px){
  .oa-footer__inner{grid-template-columns:1fr 1fr}
  .oa-footer__brand{grid-column:1 / -1}
}
@media (max-width:560px){
  .oa-footer__inner{grid-template-columns:1fr;gap:28px}
  .oa-footer__address{max-width:none}
}

/* ==========================================================================
   动画
   ========================================================================== */
@keyframes oa-pulse{
  0%{box-shadow:0 0 0 0 rgba(47,224,208,.55)}
  70%{box-shadow:0 0 0 10px rgba(47,224,208,0)}
  100%{box-shadow:0 0 0 0 rgba(47,224,208,0)}
}
@keyframes oa-blink{
  0%,100%{opacity:1}
  50%{opacity:.32}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .oa-reveal{opacity:1;transform:none}
}