:root{--primary:#0B3D91;--ink:#14213d;--muted:#68738a;--line:#e5eaf2;--soft:#f5f8fc;--accent:#f59e0b;--radius:18px}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:Arial,"Noto Sans TC","PingFang HK","Microsoft JhengHei",sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#101b32;color:#dbe6f7;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .topbar-links{display:flex;gap:20px}.topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--primary);white-space:nowrap}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{margin-left:auto}.nav-list{display:flex;align-items:center;gap:3px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}.nav-link{display:block;padding:27px 13px;font-size:14px;font-weight:700;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8490a5}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:0 18px 38px #15294d1a;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .mega-menu{width:620px}.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;pointer-events:auto}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .panel-title{margin:0 0 13px;color:var(--primary);font-weight:800;font-size:15px}
    .panel-list{display:grid;gap:8px}.panel-list a{padding:6px 0;border-bottom:1px solid var(--line);font-size:14px}
    .panel-list a:hover,.drawer-submenu a:hover{color:var(--primary)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{padding:10px;border:1px solid var(--line);border-radius:11px;background:#fbfcff;min-width:0}
    .mega-card img{width:34px;height:34px;object-fit:contain;border-radius:7px;margin-bottom:5px}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis}
    .mega-card strong{font-size:13px}.mega-card small{color:var(--muted);font-size:11px;line-height:1.5;margin-top:2px}
    .mega-footer{display:block;color:var(--primary);font-size:13px;font-weight:700;margin-top:15px}
    .header-btns{display:flex;align-items:center;gap:9px}.member-btn,.open-btn{padding:8px 13px;border-radius:8px;font-size:13px;font-weight:700}
    .member-btn{color:var(--primary);border:1px solid #cbd8ef}.open-btn{color:#fff;background:var(--primary)}
    .hamburger{display:none;border:0;background:none;padding:7px;cursor:pointer}.hamburger span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
    .drawer-overlay{display:none}.mobile-drawer{display:none}
    .video-detail-main{padding:58px 0 82px;background:linear-gradient(180deg,#f7faff 0,#fff 38%)}
    .video-breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:20px}
    .video-breadcrumb a{color:var(--primary)}
    .video-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:32px;align-items:start}
    .video-article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 14px 40px #1939670b}
    .video-player{background:#101827;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
    .video-player img{width:100%;height:100%;object-fit:cover;opacity:.72}
    .video-player:after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#08152e66,#f59e0b22)}
    .video-play{position:absolute;z-index:1;width:70px;height:70px;border-radius:50%;border:2px solid #fff;background:#0b3d91dd;color:#fff;font-size:28px;padding-left:6px}
    .video-body{padding:30px 34px}.video-body h1{font-size:clamp(25px,4vw,42px);line-height:1.25;margin:0 0 16px;color:#101c35}
    .video-meta{display:flex;flex-wrap:wrap;gap:9px 20px;padding:13px 0;margin-bottom:25px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .video-intro{font-size:17px;color:#48556c;margin:0 0 25px}.video-content{min-width:0;max-width:100%;overflow-x:auto;font-size:16px}
    .video-content img,.video-content table{max-width:100%}.video-content a{color:var(--primary);text-decoration:underline}
    .video-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px}.video-tags a{padding:5px 10px;background:#eef4ff;border-radius:99px;color:var(--primary);font-size:12px}
    .video-side{display:grid;gap:18px}.side-card{border:1px solid var(--line);border-radius:16px;background:#fff;padding:20px}
    .side-card h2{font-size:17px;margin:0 0 15px}.related-video{display:grid;grid-template-columns:100px 1fr;gap:11px;padding:11px 0;border-top:1px solid var(--line)}
    .related-video:first-of-type{border-top:0}.related-video img{width:100px;height:64px;object-fit:cover;border-radius:8px;background:#dbe5f5}
    .related-video strong{font-size:13px;line-height:1.45;display:block}.related-video small{color:var(--muted);font-size:11px}
    .back-video{display:inline-flex;padding:10px 14px;border:1px solid #cbd8ef;border-radius:9px;color:var(--primary);font-weight:700;font-size:13px}
    .footer{background:#101b32;color:#c8d3e5;padding:54px 0 20px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px}
    .footer-brand strong{color:#fff;font-size:20px}.footer p{font-size:13px;color:#aebbd0}.footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a{display:block;font-size:13px;margin:7px 0;color:#c8d3e5}.footer-grid a:hover{color:#fff}
    .footer-bottom{border-top:1px solid #31405a;margin-top:35px;padding-top:18px;display:flex;justify-content:space-between;gap:15px;font-size:12px;color:#96a6be}
    @media(max-width:980px){.main-nav{display:none}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}.hamburger{display:block}.mobile-drawer{display:block;position:fixed;z-index:40;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;box-shadow:-10px 0 35px #10244933;transition:.25s;overflow:auto}.mobile-drawer.open{right:0}.drawer-overlay{position:fixed;z-index:35;inset:0;background:#08152e88;opacity:0;visibility:hidden;transition:.25s}.drawer-overlay.open{display:block;opacity:1;visibility:visible}.drawer-head{height:76px;padding:20px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:15px;color:var(--primary);font-weight:800}.drawer-head a{margin-left:auto;color:#fff;background:var(--primary);padding:5px 10px;border-radius:7px;font-size:12px}.drawer-close{border:0;background:none;font-size:27px;color:var(--muted);cursor:pointer}.drawer-menu{padding:14px 20px}.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;font:inherit;font-weight:700;color:var(--ink)}.drawer-toggle:after{content:"＋";float:right;color:var(--primary)}.drawer-toggle.active:after{content:"－"}.drawer-submenu{display:none;padding:5px 0 8px 15px}.drawer-submenu.open{display:block}.drawer-submenu a{display:block;padding:7px 0;font-size:13px;color:var(--muted)}.video-detail-layout{grid-template-columns:1fr}.video-side{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:620px){.container{width:min(100% - 28px,1180px)}.topbar .container{display:block;padding:7px 0}.topbar-links{gap:12px;margin-top:3px}.member-btn{display:none}.video-detail-main{padding:34px 0 55px}.video-body{padding:23px 19px}.video-body h1{font-size:27px}.video-side{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:24px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:6px}}