/* ==========================================================================
   bob体育 官网样式 static/css/style.css
   体育AI科技 / AI运动助手 / 技术图谱视觉系统
   ========================================================================== */

:root{
  --c-bg:#060b16;
  --c-bg-alt:#0a1224;
  --c-panel:#0d1730;
  --c-panel-2:#101b38;
  --c-line:#1e2c4d;
  --c-line-soft:#182644;
  --c-text:#dbe4f5;
  --c-text-dim:#8fa0c4;
  --c-text-faint:#5d6d94;
  --c-cyan:#3ce7ff;
  --c-cyan-dim:#1b8fa8;
  --c-purple:#a78bfa;
  --c-orange:#ffb457;
  --c-green:#4ade80;
  --c-pink:#f472b6;
  --c-amber:#fbbf24;
  --c-red:#fb7185;
  --radius:14px;
  --radius-sm:8px;
  --maxw:1240px;
  --font-main:"Microsoft YaHei","PingFang SC","Segoe UI",-apple-system,sans-serif;
  --font-mono:"Consolas","SFMono-Regular",Menlo,monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-main);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:var(--c-cyan);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{font-weight:700;line-height:1.35;margin:0 0 .6em;color:#fff;}
h1{font-size:2rem;}
h2{font-size:1.55rem;}
h3{font-size:1.2rem;}
p{margin:0 0 1em;color:var(--c-text);}
ul,ol{margin:0 0 1em;padding-left:1.4em;}
table{border-collapse:collapse;width:100%;}
th,td{border:1px solid var(--c-line);padding:.6em .8em;text-align:left;font-size:.94rem;}
th{background:var(--c-panel-2);color:var(--c-cyan);}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.mono{font-family:var(--font-mono);}
.eyebrow{
  display:inline-block;font-family:var(--font-mono);letter-spacing:.14em;
  font-size:.72rem;color:var(--c-cyan);text-transform:uppercase;
  border:1px solid var(--c-cyan-dim);border-radius:999px;padding:.3em .9em;
  margin-bottom:.8em;background:rgba(60,231,255,.06);
}
.section{padding:64px 0;border-top:1px solid var(--c-line-soft);position:relative;}
.section-tight{padding:40px 0;}
.section-head{max-width:760px;margin-bottom:32px;}
.section-head p{color:var(--c-text-dim);}
.bg-alt{background:var(--c-bg-alt);}
.bg-grid{
  background-image:
    linear-gradient(rgba(60,231,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(60,231,255,.06) 1px,transparent 1px);
  background-size:38px 38px;
}

/* ---------- top bar / nav ---------- */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(6,11,22,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-line);
}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:var(--maxw);margin:0 auto;}
.logo{display:flex;align-items:center;gap:8px;font-size:1.25rem;font-weight:800;color:#fff;}
.logo img{width:34px;height:34px;}
.logo span{color:var(--c-cyan);}
.nav-main{display:flex;gap:2px;flex-wrap:wrap;}
.nav-main a{
  color:var(--c-text-dim);font-size:.92rem;padding:8px 12px;border-radius:8px;
}
.nav-main a:hover,.nav-main a.active{color:#fff;background:var(--c-panel-2);text-decoration:none;}
.nav-toggle{
  display:none;background:var(--c-panel-2);border:1px solid var(--c-line);
  color:#fff;border-radius:8px;padding:8px 12px;font-size:1rem;cursor:pointer;
}
.breadcrumb{
  font-family:var(--font-mono);font-size:.82rem;color:var(--c-text-faint);
  padding:14px 0;border-bottom:1px solid var(--c-line-soft);
}
.breadcrumb a{color:var(--c-text-dim);}
.breadcrumb span.sep{margin:0 6px;color:var(--c-line);}
.breadcrumb .cur{color:var(--c-cyan);}

/* ---------- hero / tech map ---------- */
.hero-map{
  padding:44px 0 60px;
  background:radial-gradient(ellipse at 50% 0%,#0d1c3d 0%,var(--c-bg) 70%);
  position:relative;overflow:hidden;
}
.hero-top{text-align:center;max-width:820px;margin:0 auto 26px;}
.hero-top .tag-row{font-family:var(--font-mono);font-size:.78rem;color:var(--c-cyan);letter-spacing:.25em;margin-bottom:14px;}
.hero-map h1{font-size:2.1rem;margin-bottom:.5em;}
.hero-map .lead{color:var(--c-text-dim);font-size:1.02rem;}
.hero-svg-wrap{max-width:1080px;margin:0 auto;border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;background:#050a15;}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:26px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:10px;
  font-size:.94rem;font-weight:600;cursor:pointer;border:1px solid var(--c-line);
  background:var(--c-panel-2);color:#fff;transition:.15s;
}
.btn:hover{border-color:var(--c-cyan);color:var(--c-cyan);text-decoration:none;transform:translateY(-1px);}
.btn-primary{background:linear-gradient(135deg,var(--c-cyan),#2a7fff);color:#04101f;border:none;}
.btn-primary:hover{color:#04101f;opacity:.9;}
.btn-outline{background:transparent;}

/* ---------- three layers ---------- */
.layers-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.layer-card{
  background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);
  padding:26px 22px;position:relative;overflow:hidden;
}
.layer-card .layer-idx{font-family:var(--font-mono);font-size:.78rem;color:var(--c-text-faint);}
.layer-card h3{margin-top:6px;}
.layer-card img{border-radius:10px;margin:14px 0;border:1px solid var(--c-line-soft);}
.layer-card ul{color:var(--c-text-dim);font-size:.92rem;}
.layer-note{
  margin-top:26px;padding:18px 22px;border-left:3px solid var(--c-cyan);
  background:rgba(60,231,255,.05);border-radius:0 10px 10px 0;color:var(--c-text-dim);
  font-size:.95rem;
}

/* ---------- dossier ---------- */
.dossier-list{display:flex;flex-direction:column;gap:18px;}
.dossier-card{
  display:grid;grid-template-columns:220px 1fr;gap:20px;
  background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);
  padding:20px;
}
.dossier-card img{border-radius:8px;border:1px solid var(--c-line-soft);}
.dossier-meta{font-family:var(--font-mono);font-size:.74rem;color:var(--c-cyan);letter-spacing:.08em;margin-bottom:8px;}
.dossier-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:6px 16px;margin:10px 0;font-size:.84rem;color:var(--c-text-dim);}
.dossier-fields b{color:var(--c-text);}
.status-pill{display:inline-block;font-size:.72rem;padding:.2em .7em;border-radius:999px;border:1px solid var(--c-green);color:var(--c-green);font-family:var(--font-mono);}

/* ---------- scenario paths ---------- */
.path-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.path-card{background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);padding:22px;}
.path-card .path-id{font-family:var(--font-mono);color:var(--c-orange);font-size:.8rem;}
.path-steps{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0;}
.path-steps span{
  font-family:var(--font-mono);font-size:.76rem;background:var(--c-panel-2);
  border:1px solid var(--c-line-soft);border-radius:999px;padding:.35em .8em;color:var(--c-text-dim);
}
.path-steps span::after{content:"→";margin-left:8px;color:var(--c-line);}
.path-steps span:last-child::after{content:"";}

/* ---------- ai or not matrix ---------- */
.matrix-table{font-size:.92rem;}
.matrix-table td.yes{color:var(--c-green);}
.matrix-table td.no{color:var(--c-red);}
.matrix-table td.maybe{color:var(--c-amber);}
.matrix-legend{display:flex;gap:20px;margin-top:14px;font-size:.85rem;color:var(--c-text-dim);flex-wrap:wrap;}
.matrix-legend span{display:inline-flex;align-items:center;gap:6px;}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block;}
.dot-yes{background:var(--c-green);}
.dot-no{background:var(--c-red);}
.dot-maybe{background:var(--c-amber);}

/* ---------- ai terminal ---------- */
.terminal-wrap{
  background:#050a15;border:1px solid var(--c-line);border-radius:var(--radius);
  overflow:hidden;
}
.terminal-bar{display:flex;gap:6px;padding:12px 16px;border-bottom:1px solid var(--c-line);background:var(--c-panel);}
.terminal-bar i{width:11px;height:11px;border-radius:50%;background:var(--c-line-soft);}
.terminal-body{padding:20px;}
.chat-row{display:grid;grid-template-columns:120px 1fr;gap:14px;margin-bottom:20px;}
.chat-q{font-family:var(--font-mono);color:var(--c-cyan);font-size:.88rem;}
.chat-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
.chat-cols div{background:var(--c-panel);border:1px solid var(--c-line-soft);border-radius:8px;padding:10px 12px;font-size:.82rem;}
.chat-cols div b{display:block;font-family:var(--font-mono);color:var(--c-text-faint);font-size:.7rem;margin-bottom:4px;letter-spacing:.06em;}
.ai-widget{margin-top:24px;}
.ai-input-row{display:flex;gap:10px;flex-wrap:wrap;}
.ai-input-row input{
  flex:1;min-width:220px;background:var(--c-panel);border:1px solid var(--c-line);
  border-radius:8px;padding:12px 14px;color:#fff;font-size:.94rem;
}
.ai-quick{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0;}
.ai-quick button{
  background:var(--c-panel-2);border:1px solid var(--c-line-soft);color:var(--c-text-dim);
  border-radius:999px;padding:.4em .9em;font-size:.8rem;cursor:pointer;
}
.ai-quick button:hover{color:var(--c-cyan);border-color:var(--c-cyan-dim);}
.ai-answer{margin-top:16px;}
.ai-disclaimer{margin-top:14px;font-size:.82rem;color:var(--c-text-faint);border-top:1px dashed var(--c-line);padding-top:12px;}

/* ---------- news after tech ---------- */
.news-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:28px;}
.news-feature{background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;}
.news-feature img{border-bottom:1px solid var(--c-line);}
.news-feature-body{padding:22px;}
.news-index{display:flex;flex-direction:column;gap:14px;}
.news-index a{
  display:block;background:var(--c-panel);border:1px solid var(--c-line);border-radius:10px;
  padding:14px 16px;color:var(--c-text);font-size:.9rem;
}
.news-index a:hover{border-color:var(--c-cyan-dim);text-decoration:none;}
.news-index .idx-tag{display:block;font-family:var(--font-mono);color:var(--c-cyan);font-size:.72rem;margin-bottom:4px;}

/* ---------- app system diagram ---------- */
.appsys-wrap{max-width:1100px;margin:0 auto;}

/* ---------- generic card grids ---------- */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.card{background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);padding:20px;}
.card img{border-radius:8px;margin-bottom:12px;border:1px solid var(--c-line-soft);}
.card h3{font-size:1.05rem;}
.card p{color:var(--c-text-dim);font-size:.9rem;margin-bottom:0;}
.tag-list{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0;}
.tag-list span{font-family:var(--font-mono);font-size:.72rem;background:var(--c-panel-2);border:1px solid var(--c-line-soft);border-radius:6px;padding:.25em .6em;color:var(--c-text-dim);}

/* ---------- article page ---------- */
.article-card{background:var(--c-panel);border:1px solid var(--c-line);border-radius:var(--radius);padding:24px;margin-bottom:22px;}
.article-meta{font-family:var(--font-mono);font-size:.76rem;color:var(--c-text-faint);display:flex;gap:16px;flex-wrap:wrap;margin:10px 0 16px;}
.article-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:8px 20px;font-size:.85rem;color:var(--c-text-dim);margin:14px 0;padding:14px;background:var(--c-panel-2);border-radius:8px;}
.article-fields b{color:#fff;}
.source-note{font-size:.82rem;color:var(--c-text-faint);border-top:1px solid var(--c-line-soft);padding-top:12px;margin-top:14px;}
.figure-cap{font-size:.82rem;color:var(--c-text-faint);padding:8px 4px 0;}
.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:26px;}
.filter-bar button{
  background:var(--c-panel);border:1px solid var(--c-line);color:var(--c-text-dim);
  padding:.5em 1.1em;border-radius:999px;font-size:.86rem;cursor:pointer;
}
.filter-bar button.active,.filter-bar button:hover{color:#fff;border-color:var(--c-cyan);background:var(--c-panel-2);}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:10px;}
.faq-item{background:var(--c-panel);border:1px solid var(--c-line);border-radius:10px;overflow:hidden;}
.faq-q{
  width:100%;text-align:left;background:none;border:none;color:#fff;font-size:.98rem;font-weight:600;
  padding:16px 18px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:10px;
}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--c-cyan);}
.faq-item.open .faq-q::after{content:"−";}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;padding:0 18px;color:var(--c-text-dim);font-size:.92rem;}
.faq-item.open .faq-a{max-height:600px;padding:0 18px 18px;}

/* ---------- forms (register) ---------- */
.register-demo{display:grid;gap:14px;max-width:520px;}
.register-demo label{display:flex;flex-direction:column;gap:6px;font-size:.88rem;color:var(--c-text-dim);}
.register-demo input{
  background:var(--c-panel-2);border:1px solid var(--c-line);border-radius:8px;
  padding:10px 12px;color:var(--c-text-faint);font-family:var(--font-mono);font-size:.86rem;
}
.register-demo button{align-self:flex-start;}

/* ---------- checkpoint steps (download) ---------- */
.checkpoint-list{display:flex;flex-direction:column;gap:14px;}
.checkpoint-item{
  display:grid;grid-template-columns:64px 1fr;gap:16px;background:var(--c-panel);
  border:1px solid var(--c-line);border-radius:var(--radius);padding:18px 20px;align-items:start;
}
.checkpoint-num{font-family:var(--font-mono);font-size:1.4rem;color:var(--c-cyan);font-weight:800;}
.platform-badges{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0;}
.platform-badges a{
  background:var(--c-panel-2);border:1px solid var(--c-line);border-radius:8px;padding:10px 18px;color:#fff;font-size:.9rem;
}

/* ---------- timeline / changelog ---------- */
.changelog-group{margin-bottom:30px;}
.changelog-group h3{color:var(--c-purple);}
.changelog-item{
  display:grid;grid-template-columns:140px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--c-line-soft);
}
.changelog-date{font-family:var(--font-mono);font-size:.8rem;color:var(--c-text-faint);}

/* ---------- company table ---------- */
.info-table td:first-child{color:var(--c-text-dim);width:190px;background:var(--c-panel-2);}

/* ---------- footer ---------- */
footer{background:var(--c-bg-alt);border-top:1px solid var(--c-line);padding:48px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:30px;margin-bottom:30px;}
.footer-col h4{color:#fff;font-size:.92rem;margin-bottom:12px;}
.footer-col a{display:block;color:var(--c-text-dim);font-size:.86rem;padding:4px 0;}
.footer-legal{font-size:.8rem;color:var(--c-text-faint);border-top:1px solid var(--c-line-soft);padding-top:20px;line-height:1.8;}
.back-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:var(--c-panel-2);border:1px solid var(--c-line);color:var(--c-cyan);
  display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;
  opacity:0;pointer-events:none;transition:.2s;z-index:50;
}
.back-top.show{opacity:1;pointer-events:auto;}

/* ---------- utility ---------- */
.mt-0{margin-top:0;}
.text-dim{color:var(--c-text-dim);}
.text-faint{color:var(--c-text-faint);}
.center{text-align:center;}
.small{font-size:.85rem;}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .layers-wrap,.path-grid,.grid-3,.grid-4,.news-layout,.footer-grid{grid-template-columns:1fr;}
  .grid-2{grid-template-columns:1fr;}
  .dossier-card{grid-template-columns:1fr;}
  .chat-cols{grid-template-columns:repeat(2,1fr);}
  .dossier-fields{grid-template-columns:repeat(2,1fr);}
  .article-fields{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .nav-main{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--c-bg-alt);border-bottom:1px solid var(--c-line);padding:10px;}
  .nav-main.open{display:flex;}
  .nav-toggle{display:block;}
  h1{font-size:1.5rem;}
  .hero-map h1{font-size:1.5rem;}
  .chat-cols{grid-template-columns:1fr;}
  .checkpoint-item{grid-template-columns:44px 1fr;}
}