:root{--brand:#0B63FF;--text:#111827;--muted:#6B7280;--border:#E5E7EB;--bg:#fff;--shadow:0 10px 30px rgba(0,0,0,.06);--radius:18px}
*{box-sizing:border-box}html,body{padding:0;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg)}
a{color:inherit;text-decoration:none}.container{max-width:1120px;margin:0 auto;padding:0 16px}
.header{border-bottom:1px solid var(--border);background:#fff;position:sticky;top:0;z-index:10}.header-inner{display:flex;gap:16px;align-items:center;padding:12px 0}
.nav{margin-left:auto;display:flex;gap:14px}.nav a{padding:8px 10px;border-radius:10px}.nav a.active,.nav a:hover{background:#F3F4F6;color:#0B63FF}
.btn{display:inline-block;padding:10px 16px;border-radius:12px;background:var(--brand);color:#fff;box-shadow:var(--shadow)}.btn.outline{background:#fff;border:1px solid #cfe0ff;color:#0B63FF}
.video-hero{margin:20px 0}.video-hero .frame{position:relative;border-radius:20px;overflow:hidden;box-shadow:var(--shadow);background:#000}
.video-hero video{width:100%;height:auto;display:block}
.video-controls{display:flex;gap:10px;justify-content:center;margin:10px 0 0 0}
.video-controls .btn{padding:10px 16px;border-radius:999px}
.playlist{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.playlist .item{border:1px solid var(--border);border-radius:12px;padding:10px;background:#fff;box-shadow:var(--shadow);cursor:pointer;display:flex;gap:10px;align-items:center}
.playlist .item.active{outline:2px solid var(--brand)}
.playlist .thumb{width:56px;height:32px;background:#E5E7EB;border-radius:8px;flex:0 0 auto;display:flex;align-items:center;justify-content:center;font-size:12px;color:#555}
.hero{margin:24px 0;background:linear-gradient(135deg,#0B63FF,#2563eb);color:#fff;border-radius:20px;padding:40px;box-shadow:var(--shadow)}.hero h1{margin:0 0 12px;font-size:34px;line-height:1.2}
.grid{display:grid;gap:16px}.grid-3{grid-template-columns:repeat(3,1fr)}.card{border:1px solid var(--border);border-radius:var(--radius);padding:16px;background:#fff;box-shadow:var(--shadow)}
.kpi{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:24px 0}.kpi .item{border:1px solid var(--border);border-radius:16px;padding:16px;background:#fff;box-shadow:var(--shadow);text-align:left}
.kpi .value{font-size:22px;font-weight:700}.kpi .label{color:var(--muted);font-size:14px}.section{margin:32px 0}h1,h2,h3{margin:12px 0}
.footer{border-top:1px solid var(--border);margin-top:40px}.footer-inner{display:flex;justify-content:space-between;align-items:center;padding:18px 0;color:#6B7280;font-size:14px}
.article{max-width:760px}.list{display:grid;gap:12px}.aspect-video{position:relative;padding-top:56.25%;background:#F3F4F6;border-radius:12px}
@media (max-width:900px){.kpi{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:1fr}.playlist{grid-template-columns:repeat(2,1fr)}}