:root{--bg:#f5f7fb;--surface:#fff;--surface2:#f8fafc;--text:#101828;--muted:#667085;--line:#e4e7ec;--line2:#d0d5dd;--primary:#155eef;--primary2:#2970ff;--cyan:#19c6e7;--navy:#07132f;--success:#079455;--danger:#d92d20;--warning:#dc6803;--shadow-sm:0 1px 3px rgba(16,24,40,.05),0 1px 2px rgba(16,24,40,.04);--shadow:0 14px 34px rgba(16,24,40,.08);--radius:18px;--sidebar:272px;--topbar:72px}
*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{margin:0;background:radial-gradient(circle at 92% 0,rgba(46,144,250,.07),transparent 24%),var(--bg);color:var(--text);font:14px/1.45 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.ui-icon{display:block;width:20px;height:20px;flex:none}.app-shell{min-height:100vh}
.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);background:linear-gradient(180deg,#07132f 0%,#0a1e49 58%,#081735 100%);color:#c8d6f5;padding:20px 15px 16px;display:flex;flex-direction:column;z-index:60;box-shadow:12px 0 40px rgba(5,16,43,.08);overflow:hidden}.sidebar:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 15% 2%,rgba(41,112,255,.2),transparent 28%),radial-gradient(circle at 110% 60%,rgba(25,198,231,.08),transparent 35%);pointer-events:none}.brand{position:relative;display:flex;align-items:center;gap:12px;padding:1px 7px 20px;margin-bottom:5px;border-bottom:1px solid rgba(255,255,255,.08)}.brand img{width:44px;height:44px;object-fit:contain;border-radius:13px;filter:drop-shadow(0 8px 20px rgba(0,0,0,.18))}.brand div{display:flex;align-items:baseline;gap:5px;letter-spacing:-.02em}.brand b{font-size:20px;color:#fff}.brand span{font-size:11px;color:#6be2ff;font-weight:850;letter-spacing:.12em}.sidebar nav{position:relative;display:flex;flex-direction:column;gap:4px;overflow:auto;padding:9px 0 14px;scrollbar-width:none}.sidebar nav::-webkit-scrollbar{display:none}.sidebar nav a{display:flex;align-items:center;gap:11px;min-height:44px;padding:7px 10px;border:1px solid transparent;border-radius:12px;color:#aebfe6;font-weight:650;transition:.16s ease}.sidebar nav a:hover{color:#fff;background:rgba(255,255,255,.055)}.sidebar nav a.active{color:#fff;background:linear-gradient(90deg,rgba(41,112,255,.25),rgba(25,198,231,.08));border-color:rgba(108,151,255,.18);box-shadow:inset 3px 0 0 #54d7f4}.nav-icon{width:31px;height:31px;border-radius:9px;display:grid;place-items:center;background:rgba(255,255,255,.055);color:#91a9d9}.sidebar nav a.active .nav-icon,.sidebar nav a:hover .nav-icon{color:#fff;background:rgba(255,255,255,.09)}.nav-icon .ui-icon{width:18px;height:18px}.sidebar-user{position:relative;margin-top:auto;padding:14px 7px 2px;border-top:1px solid rgba(255,255,255,.09);display:grid;grid-template-columns:38px 1fr 34px;gap:10px;align-items:center}.avatar,.mini-avatar{display:grid;place-items:center;border-radius:50%;background:linear-gradient(135deg,#2970ff,#19c6e7);color:#fff;font-weight:850;box-shadow:0 6px 18px rgba(41,112,255,.22)}.avatar{width:38px;height:38px}.avatar.small{width:31px;height:31px;font-size:12px}.sidebar-user b{display:block;color:#fff;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user span{display:block;color:#8297c3;font-size:11px;margin-top:2px}.logout-btn{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;color:#91a9d9}.logout-btn:hover{background:rgba(255,255,255,.08);color:#fff}.logout-btn .ui-icon{width:17px;height:17px}
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.content{padding:30px 30px 92px;max-width:1560px;margin:0 auto}.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:23px}.page-head h1{margin:0;font-size:29px;line-height:1.2;letter-spacing:-.035em;color:#101828}.page-head p{margin:6px 0 0;color:#667085;max-width:780px}.head-actions{display:flex;gap:9px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:40px;padding:9px 14px;border-radius:10px;border:1px solid var(--line);font-weight:750;background:#fff;color:#344054;box-shadow:var(--shadow-sm);transition:.15s}.btn:hover{transform:translateY(-1px);border-color:#b2ccff}.btn.primary{background:linear-gradient(135deg,#155eef,#2970ff);color:#fff;border-color:#155eef;box-shadow:0 8px 18px rgba(21,94,239,.18)}.btn.secondary{background:#eef4ff;color:#1849a9;border-color:#d1e0ff}.btn.ghost{background:transparent;box-shadow:none}.btn.small{min-height:32px;padding:6px 10px;font-size:12px}.btn.wide{width:100%}
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.login-body{min-height:100vh;background:linear-gradient(135deg,#06112b 0%,#0b2454 56%,#073c61 100%);overflow:auto}.login-body:before,.login-body:after{content:"";position:fixed;border-radius:50%;pointer-events:none}.login-body:before{width:520px;height:520px;left:-150px;top:-170px;background:radial-gradient(circle,rgba(41,112,255,.28),transparent 65%)}.login-body:after{width:460px;height:460px;right:-160px;bottom:-170px;background:radial-gradient(circle,rgba(25,198,231,.18),transparent 68%)}.login-shell{min-height:100vh;max-width:1180px;margin:auto;padding:40px;display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center;position:relative;z-index:1}.login-brand{color:#fff;max-width:610px}.login-brand>img{width:82px;height:82px;object-fit:contain;margin-bottom:34px;filter:drop-shadow(0 18px 36px rgba(0,0,0,.2))}.eyebrow{display:inline-flex;padding:6px 10px;border:1px solid rgba(125,211,252,.2);background:rgba(25,198,231,.08);border-radius:999px;color:#9fe8fa;font-size:10px;font-weight:850;letter-spacing:.15em}.login-brand h1{margin:17px 0 15px;font-size:50px;line-height:1.04;letter-spacing:-.05em;max-width:580px}.login-brand p{font-size:16px;line-height:1.7;color:#b8c8e8;max-width:560px}.login-card{background:rgba(255,255,255,.98);border:1px solid rgba(255,255,255,.9);border-radius:24px;padding:28px;box-shadow:0 30px 90px rgba(0,0,0,.28)}.login-logo{display:flex;align-items:center;gap:11px;padding-bottom:20px;border-bottom:1px solid #eef0f3;margin-bottom:22px}.login-logo img{width:42px;height:42px;object-fit:contain}.login-logo strong,.login-logo span{display:block}.login-logo strong{font-size:15px}.login-logo span{font-size:11px;color:#667085;margin-top:2px}.login-card h2{margin:0;font-size:27px;letter-spacing:-.03em}.login-card>p{margin:7px 0 20px;color:#667085}.password-wrap{display:flex;position:relative}.password-wrap input{padding-right:60px}.password-wrap button{position:absolute;right:7px;top:50%;transform:translateY(-50%);border:0;background:transparent;color:#155eef;font-size:11px;font-weight:800}.demo-note{margin-top:16px;padding:10px 11px;border-radius:10px;background:#f8fafc;color:#667085;font-size:11px;text-align:center}
html.dark{--bg:#0c111d;--surface:#151b2a;--surface2:#111827;--text:#f2f4f7;--muted:#98a2b3;--line:#283244;--line2:#344054}html.dark body{background:#0c111d;color:#f2f4f7}html.dark .topbar{background:rgba(17,24,39,.9);border-color:#283244}html.dark .panel,html.dark .table-card,html.dark .module-card,html.dark .stat-card,html.dark .discussion-card,html.dark .event-mini{background:#151b2a;border-color:#283244}html.dark .page-head h1,html.dark .panel h3,html.dark .module-card h3,html.dark td{color:#f2f4f7}html.dark .global-search,html.dark .table-search,html.dark .field input,html.dark .field select,html.dark .field textarea,html.dark .form-stack input,html.dark .form-stack select,html.dark .form-stack textarea,html.dark .grade-form input,html.dark .reply-form textarea,html.dark .icon-btn{background:#111827;border-color:#344054;color:#f2f4f7}html.dark th,html.dark .table-tools{background:#111827}html.dark tbody tr:hover{background:#182230}html.dark .metric-list b,html.dark .count-pill{background:#283244;color:#d0d5dd}html.dark .timeline-item,html.dark .stats-mini div,html.dark .contact-cards div,html.dark .day-col{background:#111827;border-color:#283244}
@media(max-width:1180px){.stats-grid{grid-template-columns:repeat(2,1fr)}.module-grid{grid-template-columns:repeat(2,1fr)}.cards-row{grid-template-columns:1fr 1fr}.content{padding:26px 24px 90px}.topbar{padding:0 24px}}
@media(max-width:900px){:root{--sidebar:280px}.sidebar{transform:translateX(-102%);transition:.22s;box-shadow:30px 0 70px rgba(5,16,43,.22)}.sidebar.open{transform:translateX(0)}.main{margin-left:0}.menu-btn{display:grid}.sidebar-backdrop{display:block;position:fixed;inset:0;background:rgba(2,6,23,.45);backdrop-filter:blur(2px);z-index:50;opacity:0;pointer-events:none;transition:.2s}.sidebar-backdrop.show{opacity:1;pointer-events:auto}.global-search{width:auto;flex:1}.dash-grid,.detail-grid,.split-grid{grid-template-columns:1fr}.login-shell{grid-template-columns:1fr;max-width:620px;gap:28px;padding:32px}.login-brand{text-align:center;margin:auto}.login-brand>img{margin:0 auto 20px}.login-brand h1{font-size:38px}.login-brand p{font-size:14px}}
@media(max-width:680px){body{font-size:13px}.topbar{height:64px;padding:0 14px;gap:9px}.global-search kbd{display:none}.global-search{padding:0 9px}.top-actions .mini-avatar{display:none}.content{padding:20px 14px 88px}.page-head{margin-bottom:18px;align-items:stretch;flex-direction:column}.page-head h1{font-size:24px}.page-head>a,.page-head>.btn,.page-head>.head-actions{align-self:flex-start}.stats-grid{grid-template-columns:1fr 1fr;gap:10px}.stat-card{padding:14px;border-radius:15px}.stat-icon{width:38px;height:38px}.stat-card strong{font-size:23px}.module-grid{grid-template-columns:1fr;gap:10px}.cards-row{grid-template-columns:1fr}.panel{padding:16px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.form-actions{position:sticky;bottom:68px;background:rgba(255,255,255,.96);margin:20px -16px -16px;padding:12px 16px;z-index:10}.reply-form{flex-direction:column;align-items:stretch}.submission{grid-template-columns:1fr}.grade-form{grid-template-columns:1fr}.contact-cards{grid-template-columns:1fr}.table-card{border-radius:14px}.table-tools{align-items:stretch;flex-direction:column}.table-search{max-width:none}.mobile-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;height:65px;background:rgba(255,255,255,.97);backdrop-filter:blur(18px);border-top:1px solid var(--line);z-index:45;padding-bottom:env(safe-area-inset-bottom)}.mobile-nav a{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:3px;color:#667085;font-size:9px;font-weight:750}.mobile-nav .ui-icon{width:18px;height:18px}.mobile-nav a:hover{color:#155eef}.login-shell{padding:22px 16px}.login-brand{display:none}.login-card{border-radius:20px;padding:22px}.login-card h2{font-size:24px}html.dark .mobile-nav,html.dark .form-actions{background:rgba(17,24,39,.97)}}
@media(max-width:420px){.stats-grid{grid-template-columns:1fr}.stat-card{align-items:center}.top-actions{gap:6px}.top-actions .icon-btn:first-child{display:none}}