:root{--theme:#0B3D91;--ink:#111827;--muted:#64748b;--line:#e5e7eb;--paper:#f8fafc;--gold:#d6a84f}
*{box-sizing:border-box}
html,body{margin:0;padding:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.topbar{background:#0f172a;color:#cbd5e1;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.topbar a{margin-left:18px;color:#e2e8f0}
.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;flex:none;font-size:20px;font-weight:800;color:#0f172a}
.logo img{width:38px;height:38px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;justify-content:center;align-items:stretch;gap:3px;margin:0;padding:0;list-style:none}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;min-height:76px;padding:0 14px;font-size:15px;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;width:330px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 45px rgba(15,23,42,.14);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s}
.mega-menu{width:570px}
.nav-item:after{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
.nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.panel-title{margin:0 0 14px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:.08em}
.panel-list{display:grid;gap:9px}
.panel-list a{display:block;padding:5px 0;color:#334155;font-size:14px}
.panel-list a:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:block;min-height:86px;padding:12px;border:1px solid var(--line);border-radius:10px;background:#f8fafc}
.mega-card:hover{border-color:var(--theme);background:#eff6ff}
.mega-card strong,.mega-card small{display:block}
.mega-card strong{font-size:14px;margin-bottom:5px}
.mega-card small{color:#64748b;font-size:12px;line-height:1.5}
.mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:5px}
.mega-footer{display:block;margin-top:15px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
.header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
.member,.open-account{padding:8px 13px;border-radius:7px;font-size:13px}
.member{color:var(--theme);border:1px solid #bfdbfe}
.open-account{background:var(--theme);color:#fff}
.hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
.hamburger span{display:block;height:2px;margin:5px 0;background:#334155;transition:.2s}
.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer-overlay{display:none;position:fixed;inset:0;z-index:40;background:rgba(15,23,42,.5)}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;right:0;top:0;bottom:0;z-index:50;width:min(380px,88vw);overflow:auto;background:#fff;transform:translateX(100%);transition:.25s;box-shadow:-15px 0 40px rgba(15,23,42,.2)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line)}
.drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
.drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer;color:#475569}
.drawer-menu{padding:10px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #eef2f7;background:none;text-align:left;font:inherit;color:#1e293b;cursor:pointer}
.drawer-toggle:after{content:"＋";float:right;color:#94a3b8}
.drawer-toggle.active:after{content:"－"}
.drawer-submenu{display:none;padding:5px 14px;background:#f8fafc}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:9px 0;color:#64748b;font-size:14px}
.footer{margin-top:70px;background:#0f172a;color:#cbd5e1}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding:48px 0 38px}
.footer-brand img{width:42px;height:42px;object-fit:contain;margin-bottom:10px}
.footer-brand strong{display:block;color:#fff;font-size:18px}
.footer p{margin:10px 0;color:#94a3b8;font-size:13px}
.footer h3{margin:0 0 14px;color:#fff;font-size:15px}
.footer-grid>div:not(.footer-brand) a{display:block;margin:8px 0;color:#94a3b8;font-size:13px}
.footer-grid a:hover{color:#fff}
.footer-bottom{padding:17px 0;border-top:1px solid #263449;color:#94a3b8;font-size:12px}
.video-detail-main{padding:0 0 20px;background:#fff}
.video-crumb{padding:20px 0 12px;color:#64748b;font-size:13px}
.video-crumb a{color:var(--theme)}
.video-heading{text-align:center;padding:10px 0 28px}
.video-heading h1{max-width:900px;margin:0 auto 12px;font-size:clamp(28px,4vw,48px);line-height:1.2;letter-spacing:-.03em;color:#0f172a}
.video-heading .video-meta{display:flex;justify-content:center;flex-wrap:wrap;gap:16px;color:#64748b;font-size:14px}
.video-stage{position:relative;isolation:isolate;overflow:hidden;min-height:clamp(360px,53vw,690px);border-radius:16px;background:#050505;box-shadow:0 20px 50px rgba(15,23,42,.2)}
.video-stage:before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(115deg,rgba(2,6,23,.95),rgba(15,23,42,.38) 50%,rgba(127,29,29,.7)),url("{视频封面}") center/cover no-repeat;filter:saturate(.85)}
.video-stage:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(0deg,rgba(0,0,0,.92),transparent 45%,rgba(0,0,0,.25))}
.stage-topline{position:absolute;top:24px;left:28px;right:28px;display:flex;justify-content:space-between;align-items:center;color:#f8e4a9;font-size:12px;letter-spacing:.18em;text-transform:uppercase}
.stage-mark{display:inline-flex;align-items:center;gap:8px}
.stage-mark:before{content:"";width:8px;height:8px;border-radius:50%;background:#dc2626;box-shadow:0 0 16px #ef4444}
.chapter-list{position:absolute;top:78px;right:26px;display:grid;gap:8px;width:190px}
.chapter-list span{padding:8px 11px;border-left:2px solid rgba(214,168,79,.38);background:rgba(0,0,0,.38);color:#d1d5db;font-size:12px}
.chapter-list span:first-child{border-color:var(--gold);color:#f8e4a9}
.play-button{position:absolute;top:43%;left:50%;width:78px;height:78px;display:grid;place-items:center;border:1px solid rgba(248,228,169,.7);border-radius:50%;background:rgba(8,8,8,.45);color:#f8e4a9;font-size:28px;transform:translate(-50%,-50%);box-shadow:0 0 0 12px rgba(214,168,79,.08)}
.play-button:after{content:"";margin-left:5px;border-top:11px solid transparent;border-bottom:11px solid transparent;border-left:16px solid currentColor}
.subtitle-bar{position:absolute;left:7%;right:7%;bottom:12%;padding:17px 22px;border-left:4px solid var(--gold);background:rgba(0,0,0,.7);color:#f8e4a9;font-size:clamp(17px,2.5vw,28px);font-weight:700;letter-spacing:.03em}
.stage-actions{position:absolute;left:7%;bottom:5%;display:flex;gap:12px}
.stage-actions a{padding:10px 20px;border:1px solid var(--gold);border-radius:5px;color:#f8e4a9;font-size:14px}
.stage-actions a:first-child{background:#a51d2d;border-color:#a51d2d;color:#fff}
.video-content-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;margin-top:36px}
.video-body,.related-videos{min-width:0}
.video-body h2,.related-videos h2{margin:0 0 15px;font-size:22px;color:#0f172a}
.video-description{padding:22px;border:1px solid var(--line);border-radius:12px;background:#fff;color:#475569}
.video-description img,.video-description table{max-width:100%}
.video-description{overflow-x:auto}
.video-player{margin:0 0 25px;max-width:100%;overflow:hidden;border-radius:12px;background:#020617}
.video-player iframe,.video-player video{display:block;width:100%;min-height:400px;border:0}
.video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.video-tags a{padding:5px 10px;border-radius:20px;background:#eff6ff;color:var(--theme);font-size:12px}
.related-list{display:grid;gap:12px}
.related-card{display:block;overflow:hidden;border:1px solid var(--line);border-radius:10px;background:#fff}
.related-card:hover{border-color:var(--theme)}
.related-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:#e2e8f0}
.related-card div{padding:10px 12px}
.related-card strong{display:block;font-size:14px;line-height:1.45}
.related-card small{display:block;margin-top:5px;color:#64748b;font-size:12px}
.video-bottom-nav{display:flex;justify-content:space-between;gap:18px;margin-top:28px;padding-top:20px;border-top:1px solid var(--line);color:#475569;font-size:14px}
.video-bottom-nav a{color:var(--theme)}
@media(max-width:980px){
.main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}
.footer-grid{grid-template-columns:repeat(2,1fr)}
.video-content-grid{grid-template-columns:1fr}.related-list{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:640px){
.container{width:min(100% - 28px,1180px)}.topbar .container{display:block;padding:8px 0}.topbar a{margin:0 12px 0 0}
.logo{font-size:17px}.member{display:none}.open-account{padding:7px 10px}.header-inner{min-height:64px}.nav-link{min-height:64px}
.video-heading{padding-bottom:20px}.video-heading h1{font-size:29px}.video-stage{min-height:470px;border-radius:10px}.chapter-list{display:none}
.stage-topline{left:18px;right:18px;top:18px}.subtitle-bar{left:18px;right:18px;bottom:92px;padding:13px 15px;font-size:17px}.stage-actions{left:18px;bottom:28px}
.stage-actions a{padding:8px 13px}.video-player iframe,.video-player video{min-height:240px}.related-list{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr;gap:24px;padding:35px 0}
.video-bottom-nav{display:block}.video-bottom-nav div{margin:8px 0}
}