:root{--bg: #f6f7fb;--surface: #ffffff;--surface-2: #f8fafc;--border: #e6e8ee;--border-strong: #d4d8e3;--text: #0f172a;--text-soft: #475569;--muted: #94a3b8;--accent: #1d4ed8;--accent-strong: #1e3a8a;--accent-soft: #eff6ff;--accent-contrast: #ffffff;--accent-shadow: 29, 78, 216;--accent2: #f97316;--accent2-strong: #ea580c;--accent2-soft: #fff7ed;--accent2-shadow: 234, 88, 12;--ok: #16a34a;--ok-soft: #ecfdf5;--warn: #d97706;--warn-soft: #fffbeb;--danger: #dc2626;--danger-soft: #fef2f2;--info: #0ea5e9;--info-soft: #f0f9ff;--radius: 14px;--radius-sm: 10px;--radius-xs: 8px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .04), 0 1px 3px rgba(15, 23, 42, .06);--shadow-md: 0 4px 12px rgba(15, 23, 42, .06), 0 2px 4px rgba(15, 23, 42, .04);--shadow-lg: 0 12px 32px rgba(15, 23, 42, .1);--sidebar-w: 248px;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;background:radial-gradient(1200px 480px at 100% -10%,rgba(var(--accent-shadow),.06),transparent 60%),var(--bg);color:var(--text);min-height:100vh}a{color:var(--accent-strong);text-decoration:none}a:hover{text-decoration:underline}h1{font-size:1.55rem;font-weight:700;letter-spacing:-.02em;margin:0 0 4px}h2{font-size:1.05rem;font-weight:650;letter-spacing:-.01em;margin:28px 0 12px;color:var(--text)}.app-shell{display:grid;grid-template-columns:var(--sidebar-w) 1fr;min-height:100vh}.sidebar{position:sticky;top:0;align-self:start;height:100vh;display:flex;flex-direction:column;gap:6px;padding:18px 14px;background:var(--surface);border-right:1px solid var(--border)}.brand{display:flex;align-items:center;gap:10px;padding:8px 10px 16px;font-weight:700;font-size:1.05rem;letter-spacing:-.02em}.brand .logo{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;color:#fff;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-strong) 100%);box-shadow:0 4px 12px rgba(var(--accent-shadow),.35);flex:none}.nav-links{display:flex;flex-direction:column;gap:2px}.nav-link{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:var(--radius-sm);color:var(--text-soft);font-weight:550;text-decoration:none;transition:background .12s ease,color .12s ease}.nav-link:hover{background:var(--surface-2);color:var(--text);text-decoration:none}.nav-link .ico{width:18px;height:18px;flex:none;opacity:.85}.nav-link.active{background:var(--accent-soft);color:var(--accent-strong);box-shadow:inset 3px 0 0 var(--accent2)}.nav-link.active .ico{opacity:1}.sidebar-foot{margin-top:auto;padding-top:12px;border-top:1px solid var(--border)}.main{min-width:0;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:flex-end;gap:12px;padding:12px 36px;border-bottom:1px solid var(--border);background:var(--surface)}.course-switcher{display:inline-flex;align-items:center;gap:9px}.course-switcher .cs-label{color:var(--muted);font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.content{padding:32px 36px 56px;max-width:1120px;width:100%;margin:0 auto}.page-sub{color:var(--muted);margin:0 0 22px;font-size:.92rem}.card{border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;margin-bottom:14px;background:var(--surface);box-shadow:var(--shadow-sm)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin-bottom:8px}.stat{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:16px 18px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:6px}.stat .label{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;font-weight:600}.stat .value{font-size:1.5rem;font-weight:700;letter-spacing:-.02em}.stat .value.small{font-size:1.05rem;font-weight:600}.bar{--pct: 0%;position:relative;height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden;min-width:90px}.bar>span{position:absolute;top:0;right:0;bottom:0;left:0;width:var(--pct);border-radius:999px;background:linear-gradient(90deg,var(--accent) 0%,var(--accent-strong) 100%);transition:width .4s ease}.bar.ok>span{background:linear-gradient(90deg,#22c55e,#16a34a)}.bar.warn>span{background:linear-gradient(90deg,#fbbf24,#d97706)}.bar.danger>span{background:linear-gradient(90deg,#f87171,#dc2626)}.bar-row{display:flex;align-items:center;gap:10px}.bar-row .pct{font-variant-numeric:tabular-nums;color:var(--text-soft);font-size:.85rem;min-width:38px;text-align:right}.badge{display:inline-flex;align-items:center;gap:5px;padding:2px 9px;border-radius:999px;font-size:.78rem;font-weight:600;line-height:1.6;border:1px solid transparent;white-space:nowrap}.badge.neutral{background:var(--surface-2);color:var(--text-soft);border-color:var(--border)}.badge.accent{background:var(--accent-soft);color:var(--accent-strong)}.badge.ok{background:var(--ok-soft);color:var(--ok)}.badge.warn{background:var(--warn-soft);color:var(--warn)}.badge.danger{background:var(--danger-soft);color:var(--danger)}.badge.info{background:var(--info-soft);color:var(--info)}.badge .dot{width:6px;height:6px;border-radius:999px;background:currentColor}.table-wrap{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--surface);box-shadow:var(--shadow-sm)}table{border-collapse:collapse;width:100%}thead th{text-align:left;padding:11px 16px;font-size:.74rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:var(--surface-2);border-bottom:1px solid var(--border)}tbody td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text);vertical-align:middle}tbody tr:last-child td{border-bottom:none}tbody tr{transition:background .1s ease}tbody tr:hover{background:var(--surface-2)}button{cursor:pointer;font:inherit;font-weight:600;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:8px 14px;transition:background .12s ease,border-color .12s ease,box-shadow .12s ease}button:hover{background:var(--surface-2);border-color:var(--muted)}button:active{transform:translateY(.5px)}button.btn-danger{color:var(--danger);border-color:#f3c0c0;background:var(--danger-soft)}button.btn-danger:hover{background:#fde7e7;border-color:#e9a3a3}button.btn-ghost{border-color:transparent;background:transparent;color:var(--text-soft);padding:7px 10px}button.btn-ghost:hover{background:var(--surface-2);color:var(--text)}.enroll-banner{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--accent-soft);border-radius:var(--radius-sm);margin-bottom:16px}.filters{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:16px}.filters label{display:inline-flex;align-items:center;gap:8px;color:var(--text-soft);font-weight:550;font-size:.9rem}select{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:7px 11px;cursor:pointer;transition:border-color .12s ease,box-shadow .12s ease}select:focus-visible,button:focus-visible,a:focus-visible{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.muted{color:var(--muted)}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spacer{flex:1}.kv{display:flex;gap:8px;align-items:baseline}.kv .k{color:var(--muted);font-size:.85rem}.empty{display:grid;place-items:center;gap:6px;padding:40px 16px;color:var(--muted);border:1px dashed var(--border-strong);border-radius:var(--radius);background:var(--surface)}.state{display:flex;align-items:center;gap:12px;padding:28px;color:var(--text-soft)}.spinner{width:20px;height:20px;border:2.5px solid var(--accent-soft);border-top-color:var(--accent);border-radius:999px;animation:spin .7s linear infinite;flex:none}@keyframes spin{to{transform:rotate(360deg)}}.auth{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr}.auth-hero{position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:center;gap:22px;padding:56px clamp(36px,6vw,84px);color:#fff;background:radial-gradient(900px 520px at 12% 0%,rgba(255,255,255,.16),transparent 55%),radial-gradient(700px 600px at 100% 100%,rgba(255,255,255,.1),transparent 50%),linear-gradient(150deg,var(--accent) 0%,var(--accent-strong) 52%,#172554 100%)}.auth-hero .brand{padding:0;color:#fff}.auth-hero .brand .logo{background:#ffffff2e;box-shadow:none}.auth-hero h1{font-size:clamp(1.9rem,3.4vw,2.6rem);line-height:1.12;margin:6px 0 0;max-width:16ch}.auth-hero .lead{font-size:1.02rem;line-height:1.55;max-width:46ch;color:#ffffffdb;margin:0}.auth-features{display:flex;flex-direction:column;gap:12px;margin-top:6px}.auth-feature{display:flex;align-items:center;gap:12px;font-weight:500;color:#fffffff2}.auth-feature .check{flex:none;width:26px;height:26px;border-radius:999px;display:grid;place-items:center;background:#ffffff2e}.auth-panel{display:grid;place-items:center;padding:40px 24px;background:var(--surface)}.auth-card{width:100%;max-width:380px;display:flex;flex-direction:column;gap:8px;text-align:center}.auth-card .logo-lg{width:56px;height:56px;margin:0 auto 10px;display:grid;place-items:center;border-radius:16px;color:#fff;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-strong) 100%);box-shadow:0 10px 28px rgba(var(--accent-shadow),.4)}.auth-card h2{margin:0;font-size:1.3rem}.auth-card .hint{color:var(--muted);margin:0 0 18px;font-size:.92rem}.auth-form{text-align:left;display:flex;flex-direction:column;gap:14px}.auth-form .field{display:flex;flex-direction:column;gap:6px}.auth-form label{font-size:.85rem;font-weight:600;color:var(--text-soft)}.auth-form input{width:100%;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:11px 13px;transition:border-color .12s ease,box-shadow .12s ease}.auth-form input:focus-visible{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.auth-form .btn-primary{margin-top:4px}.auth-card .btn-primary:disabled{opacity:.65;cursor:default;filter:none}.alert{text-align:left;background:var(--danger-soft);color:var(--danger);border:1px solid #f3c0c0;border-radius:var(--radius-sm);padding:10px 13px;margin-bottom:16px;font-size:.9rem;font-weight:500}.btn-primary{width:100%;justify-content:center;display:inline-flex;align-items:center;gap:10px;padding:12px 18px;font-size:1rem;font-weight:650;color:var(--accent-contrast);background:linear-gradient(135deg,var(--accent2) 0%,var(--accent2-strong) 100%);border:none;border-radius:var(--radius-sm);box-shadow:0 6px 18px rgba(var(--accent2-shadow),.38)}.btn-primary:hover{color:var(--accent-contrast);background:linear-gradient(135deg,var(--accent2) 0%,var(--accent2-strong) 100%);border-color:transparent;filter:brightness(1.06);box-shadow:0 8px 22px rgba(var(--accent2-shadow),.48)}.splash{min-height:100vh;display:grid;place-items:center;gap:18px;background:radial-gradient(900px 480px at 50% 0%,var(--accent-soft),transparent 60%),var(--bg)}.splash-inner{display:flex;flex-direction:column;align-items:center;gap:16px;color:var(--text-soft)}.splash .logo-lg{width:52px;height:52px;display:grid;place-items:center;border-radius:15px;color:#fff;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-strong) 100%);box-shadow:0 10px 28px rgba(var(--accent-shadow),.4)}@media (max-width: 860px){.auth{grid-template-columns:1fr}.auth-hero{display:none}.auth-panel{min-height:100vh}}@media (max-width: 760px){.app-shell{grid-template-columns:1fr}.sidebar{position:sticky;top:0;height:auto;flex-direction:row;align-items:center;gap:4px;padding:10px 12px;border-right:none;border-bottom:1px solid var(--border);overflow-x:auto;z-index:10}.brand{padding:4px 8px}.brand .brand-text{display:none}.nav-links{flex-direction:row}.nav-link span:not(.ico){display:none}.sidebar-foot{margin-top:0;margin-left:auto;padding-top:0;border-top:none}.content{padding:22px 16px 44px}.topbar{padding:10px 16px}}@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important}}