/* ============================================================
   优博看台 /assets/site.css — 框架式 Bento 赛前面板
   ============================================================ */

:root{
  --ink:#0B211C;
  --pitch:#123028;
  --line:#1E4A3E;
  --pulse:#3BF0AE;
  --soft:#A8F5D6;
  --amber:#FFA02E;
  --amber-deep:#C96F0B;
  --text:#C7D1CD;
  --mute:#7E8C87;
  --paper:#F2F6F3;
  --shadow:#05100D;

  --font-display:"Barlow Condensed","Oswald","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:88px;
  --bar-h:72px;
  --pad:clamp(16px,3vw,40px);
  --hard:6px 6px 0 var(--shadow);
  --hard-sm:4px 4px 0 var(--shadow);
  --ease:cubic-bezier(.2,.8,.25,1);
  --pulse-cycle:2.4s;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
img,svg{display:block;max-width:100%}
:focus-visible{outline:3px solid var(--pulse);outline-offset:2px;box-shadow:0 0 0 2px var(--ink)}
::selection{background:var(--amber);color:var(--shadow)}

/* ---------- 基础排版 ---------- */
body{
  background-color:var(--ink);
  background-image:repeating-linear-gradient(12deg,rgba(30,74,62,.34) 0 1px,transparent 1px 96px);
  background-attachment:fixed;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  padding-left:var(--rail-w);
  padding-top:var(--bar-h);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.12;letter-spacing:.01em;color:var(--paper)}
h1{font-size:clamp(34px,5vw,64px)}
h2{font-size:clamp(24px,3vw,38px)}
h3{font-size:clamp(18px,2.2vw,24px);font-family:var(--font-body);font-weight:700;letter-spacing:0}
p{max-width:38em}
#main-content:focus{outline:none}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;top:0;left:50%;z-index:300;
  transform:translate(-50%,-160%);
  padding:12px 20px;
  background:var(--pulse);color:var(--shadow);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.08em;
  border:2px solid var(--shadow);
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,8px)}

/* ---------- 脉冲点 ---------- */
.pulse-dot{
  display:inline-block;width:8px;height:8px;flex:0 0 auto;
  background:var(--pulse);
  box-shadow:0 0 0 2px rgba(59,240,174,.16);
  animation:pulse-dot var(--pulse-cycle) var(--ease) infinite;
}
@keyframes pulse-dot{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.32;transform:scale(.7)}
}

/* ---------- 头部框架 ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:100}

.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;
  background:rgba(30,74,62,.7);z-index:150;pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--pulse),var(--amber));
  transition:transform .12s linear;
}

.frame-bar{
  display:flex;align-items:center;gap:clamp(10px,2vw,24px);
  height:var(--bar-h);
  padding-inline:clamp(14px,2.2vw,28px);
  background:var(--ink);
  border-bottom:2px solid var(--line);
  box-shadow:0 2px 0 var(--shadow);
  transition:background-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header[data-scrolled] .frame-bar{
  background:linear-gradient(90deg,var(--ink) 0%,var(--pitch) 100%);
  box-shadow:0 6px 0 rgba(5,16,13,.8);
}

.brand{display:flex;align-items:center;gap:12px;margin-right:auto;min-width:0}
.brand__mark{
  position:relative;flex:0 0 auto;width:36px;height:36px;
  border:2px solid var(--pulse);
  background:
    linear-gradient(135deg,transparent 45%,var(--pulse) 45% 55%,transparent 55%),
    linear-gradient(160deg,var(--pitch),var(--ink));
  box-shadow:var(--hard-sm);
}
.brand__mark::after{
  content:"";position:absolute;right:-5px;bottom:-5px;width:8px;height:8px;
  background:var(--amber);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand__name{
  font-family:var(--font-display);font-weight:800;
  font-size:22px;letter-spacing:.08em;color:var(--paper);
}
.brand__tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.13em;color:var(--mute);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

.frame-bar__meta{
  display:none;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mute);
  white-space:nowrap;
}
.frame-bar__cta{flex:0 0 auto}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;
  border:2px solid var(--line);
  background:var(--pitch);color:var(--soft);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.14em;
  box-shadow:var(--hard-sm);cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--pulse);color:var(--pulse)}
.nav-toggle:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--shadow)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars > span{
  display:block;height:2px;background:var(--pulse);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{display:inline-block}

/* ---------- 左侧竖向导航导轨 ---------- */
.site-rail{
  position:fixed;top:var(--bar-h);left:0;bottom:0;width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;
  padding:18px 0;
  background:linear-gradient(180deg,var(--pitch) 0%,var(--ink) 72%);
  border-right:2px solid var(--line);
  overflow-y:auto;overscroll-behavior:contain;
  z-index:95;
}
.rail__list{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  width:100%;
}
.rail__item{display:flex;justify-content:center;width:100%}
.rail__link{
  writing-mode:vertical-rl;
  display:block;
  padding:12px 9px;
  border:2px solid transparent;
  color:var(--text);
  font-size:14px;letter-spacing:.22em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.rail__index{
  font-family:var(--font-mono);font-size:10px;font-weight:500;
  letter-spacing:.08em;color:var(--mute);
}
.rail__index::after{content:"·"}
.rail__label{display:inline}
.rail__link:hover,
.rail__link:focus-visible{
  color:var(--soft);border-color:var(--pulse);
  background:rgba(59,240,174,.07);
}
.rail__link[aria-current="page"]{
  color:var(--pulse);border-color:var(--line);
  background:rgba(59,240,174,.1);
}
.rail__link[aria-current="page"] .rail__index{color:var(--amber)}
.rail__link[aria-current="page"] .rail__label::after{
  content:"";display:block;width:6px;height:6px;margin-top:8px;
  background:var(--amber);
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,var(--ink) 0%,var(--pitch) 42%,var(--ink) 100%);
  border-top:2px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:140px;
  background:linear-gradient(180deg,rgba(59,240,174,.09),transparent);
  pointer-events:none;
}
.footer-inner{
  position:relative;z-index:1;
  max-width:1220px;margin-inline:auto;
  padding:clamp(34px,6vw,72px) var(--pad) 0;
}
.footer-top{
  display:grid;
  grid-template-columns:1.5fr .8fr .8fr 1.15fr;
  gap:clamp(20px,3vw,44px);
  padding-bottom:clamp(26px,4vw,46px);
  border-bottom:2px solid var(--line);
}
.footer-brand__name{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(26px,3vw,34px);line-height:1.1;
  letter-spacing:.08em;color:var(--paper);
}
.footer-brand__tag{
  margin-top:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--pulse);
}
.footer-lede{
  margin-top:14px;max-width:26em;
  font-size:14.5px;line-height:1.8;color:var(--text);
}
.footer-stamp{
  display:flex;align-items:center;gap:8px;margin-top:16px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:var(--mute);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.24em;color:var(--soft);
  padding-bottom:10px;margin-bottom:12px;
  border-bottom:1px dashed var(--line);
}
.footer-list{display:grid;gap:9px}
.footer-link{
  display:inline-block;
  font-size:14.5px;color:var(--text);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible{color:var(--pulse);border-color:var(--pulse);transform:translateX(3px)}

.footer-contact__list{display:grid}
.footer-contact__item{
  display:grid;grid-template-columns:44px 1fr;gap:10px;align-items:baseline;
  padding-block:9px;
  border-bottom:1px dashed rgba(30,74,62,.9);
  font-size:13.5px;
}
.footer-contact__item:last-child{border-bottom:0}
.footer-contact__label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--mute);
}
.footer-contact__value{color:var(--text);word-break:break-word}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;
  padding-block:20px 30px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer-legal__link{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mute);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-legal__link:hover,
.footer-legal__link:focus-visible{color:var(--pulse);border-color:var(--pulse)}
.footer-meta{
  display:flex;flex-wrap:wrap;gap:6px 20px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--mute);
}
.footer-meta__icp{color:var(--mute)}
.footer-meta__copy{color:var(--mute)}
.footer-mark{
  position:absolute;right:clamp(8px,3vw,40px);bottom:-14px;
  margin:0;max-width:none;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(56px,11vw,150px);line-height:.8;letter-spacing:.02em;
  color:rgba(30,74,62,.55);
  pointer-events:none;user-select:none;
}

/* ---------- 通用容器与章节 ---------- */
.wrap{
  width:100%;max-width:1220px;margin-inline:auto;
  padding-inline:var(--pad);
}
.section{position:relative;padding-block:clamp(38px,6vw,84px)}
.section__head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(12px,2vw,26px);align-items:start;
  margin-bottom:clamp(18px,3vw,34px);
}
.section__tag{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.32em;
  color:var(--mute);
  padding-block-start:4px;
  border-inline-start:2px solid var(--line);
  padding-inline-start:9px;
}
.section__title{color:var(--paper)}
.lede{margin-top:12px;max-width:34em;color:var(--text)}
.prose{max-width:34em;display:grid;gap:14px}
.prose p{max-width:34em}

/* ---------- 斜切分区 ---------- */
.edge-slant{clip-path:polygon(0 0,100% 0,100% 100%,0 calc(100% - 30px))}
.edge-slant--flip{clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),0 100%)}

/* ---------- Bento ---------- */
.bento{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(10px,1.4vw,18px);
}
.tile{
  grid-column:span 4;
  position:relative;
  padding:clamp(16px,2.2vw,26px);
  background:var(--pitch);
  border:2px solid var(--line);
  box-shadow:var(--hard);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.tile:hover{
  border-color:var(--pulse);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 var(--shadow);
}
.tile--1x1{grid-column:span 4}
.tile--2x1{grid-column:span 8}
.tile--1x2{grid-column:span 4;grid-row:span 2}
.tile--2x2{grid-column:span 8;grid-row:span 2}
.tile--paper{
  background:var(--paper);color:#12211D;border-color:var(--ink);
}
.tile--paper h2,.tile--paper h3,.tile--paper .tile__title{color:#0B211C}
.tile--paper .tile__kicker{color:var(--amber-deep)}
.tile__kicker{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.22em;color:var(--mute);
  display:block;margin-bottom:10px;
}
.tile__title{font-size:clamp(17px,2vw,21px);color:var(--paper);font-weight:700;line-height:1.35}

/* ---------- 指标 ---------- */
.stat{display:grid;gap:4px}
.stat__value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(24px,3.4vw,36px);line-height:1.05;
  color:var(--amber);letter-spacing:-.01em;
}
.stat__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--mute);
}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:var(--pitch);
  --btn-fg:var(--soft);
  --btn-bd:var(--line);
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 20px;
  font-family:var(--font-mono);font-size:13.5px;font-weight:700;letter-spacing:.08em;
  background:var(--btn-bg);color:var(--btn-fg);
  border:2px solid var(--btn-bd);
  box-shadow:var(--hard-sm);
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),
             background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:7px 7px 0 var(--shadow)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--shadow)}
.btn--pulse{--btn-bg:var(--pulse);--btn-fg:var(--shadow);--btn-bd:var(--pulse)}
.btn--pulse:hover{--btn-bg:var(--soft);--btn-bd:var(--soft)}
.btn--amber{--btn-bg:var(--amber);--btn-fg:var(--shadow);--btn-bd:var(--amber)}
.btn--amber:hover{--btn-bg:#FFB65C;--btn-bd:#FFB65C}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--text);--btn-bd:var(--line)}
.btn--ghost:hover{--btn-fg:var(--soft);--btn-bd:var(--pulse)}
.btn--sm{padding:8px 14px;font-size:12px;box-shadow:var(--hard-sm)}

/* ---------- 面包屑 ---------- */
.crumbs{margin-block:0 clamp(16px,2.4vw,26px)}
.crumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mute);
}
.crumbs__item{display:flex;align-items:center;gap:8px}
.crumbs__link{color:var(--mute);border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease)}
.crumbs__link:hover,.crumbs__link:focus-visible{color:var(--pulse);border-color:var(--pulse)}
.crumbs__item[aria-current="page"]{color:var(--soft)}
.crumbs__sep{color:var(--line)}

/* ---------- 图片容器（页面阶段放图） ---------- */
.media-frame{
  position:relative;overflow:hidden;
  min-height:150px;
  border:2px solid var(--line);
  box-shadow:var(--hard);
  background:
    repeating-linear-gradient(135deg,rgba(59,240,174,.1) 0 2px,transparent 2px 14px),
    linear-gradient(160deg,var(--pitch),var(--ink));
}
.media-frame > img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__label{
  position:absolute;left:0;bottom:0;
  padding:6px 10px;
  background:var(--ink);color:var(--soft);
  border-top:2px solid var(--line);border-right:2px solid var(--line);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
}

/* ---------- 纸白分区 ---------- */
.surface-paper{
  background:var(--paper);color:#12211D;
  border-block:2px solid var(--line);
}
.surface-paper h2,.surface-paper h3{color:#0B211C}
.surface-paper a{color:var(--amber-deep)}
.surface-paper a:hover{color:#0B211C}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s var(--ease) var(--reveal-delay,0ms),
             transform .5s var(--ease) var(--reveal-delay,0ms);
}
[data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (max-width:1023px){
  :root{--rail-w:0px;--bar-h:64px}

  .frame-bar{padding-inline:14px}
  .brand__name{font-size:19px}
  .nav-toggle{display:inline-flex}

  .site-rail{
    top:auto;left:0;right:0;bottom:0;width:100%;
    max-height:min(78vh,560px);
    padding:8px 0 12px;
    border-right:0;border-top:2px solid var(--pulse);
    background:var(--pitch);
    box-shadow:0 -8px 0 rgba(5,16,13,.65);
    transform:translateY(103%);
    transition:transform .3s var(--ease);
    z-index:96;
  }
  .site-rail[data-open]{transform:translateY(0)}
  .rail__list{
    display:grid;grid-template-columns:1fr 1fr;gap:2px;
    background:var(--line);border-block:2px solid var(--line);
    align-items:stretch;
  }
  .rail__item{background:var(--pitch);justify-content:flex-start}
  .rail__link{
    writing-mode:horizontal-tb;
    display:flex;align-items:baseline;gap:10px;
    padding:14px 16px;font-size:15px;letter-spacing:.04em;
    border:0;
  }
  .rail__link:hover,
  .rail__link:focus-visible{background:rgba(59,240,174,.1);border-color:transparent}
  .rail__link[aria-current="page"]{
    background:rgba(59,240,174,.12);border-color:transparent;
    box-shadow:inset 3px 0 0 var(--amber);
  }
  .rail__link[aria-current="page"] .rail__label::after{display:none}

  html.nav-open{overflow:hidden}

  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .bento{grid-template-columns:repeat(6,minmax(0,1fr))}
  .tile,.tile--1x1,.tile--1x2{grid-column:span 3}
  .tile--2x1,.tile--2x2{grid-column:span 6;grid-row:auto}
  .section__tag{writing-mode:horizontal-tb;border-inline-start:0;padding-inline-start:0;border-bottom:2px solid var(--line);padding-bottom:6px}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  .brand__tag{display:none}
  .frame-bar__cta{display:none}
  .frame-bar__meta{display:none}
  .rail__list{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-mark{display:none}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .bento{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tile,.tile--1x1,.tile--1x2,.tile--2x1,.tile--2x2{grid-column:span 2;grid-row:auto}
  .section__head{grid-template-columns:1fr}
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .scroll-progress__bar{transition:none}
}