:root{--primary:#1e3a8a;--primary-hover:#1e40af;--primary-light:#eef2ff;--secondary:#0284c7;--success:#047857;--warning:#b45309;--danger:#b91c1c;--bg:#f8fafc;--surface:#fff;--text:#0f172a;--text-muted:#64748b;--text-subtle:#94a3b8;--border:#e2e8f0;--border-strong:#cbd5e1;--shadow-sm:0 1px 2px #0f172a0a;--shadow:0 1px 3px #0f172a14, 0 1px 2px #0f172a0a;--shadow-lg:0 10px 25px -5px #0f172a14, 0 8px 10px -6px #0f172a0a;--radius:10px;--radius-sm:6px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;line-height:1.55}#app{min-height:100vh}a{color:var(--primary);font-weight:500;text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{color:var(--text);letter-spacing:-.01em;margin:0 0 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svg{opacity:.85;flex-shrink:0}.search-icon{color:var(--text-subtle);pointer-events:none;position:absolute;top:50%;left:26px;transform:translateY(-50%)}.input-with-icon{padding-left:34px}.grid{gap:16px;display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (width<=900px){.grid-2,.grid-3,.grid-4,.shell{grid-template-columns:1fr}.sidebar{z-index:50;transition:transform .2s;position:fixed;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main{padding:16px}}.stat-card{flex-direction:column;gap:4px;display:flex}.stat-card .stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;font-size:12px;font-weight:500}.stat-card .stat-value{color:var(--text);letter-spacing:-.02em;font-size:26px;font-weight:700;line-height:1.2}.stat-card .stat-delta{color:var(--success);margin-top:2px;font-size:11px}.stat-card.warning .stat-value{color:var(--warning)}.stat-card.danger 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6px;font-size:11px}.flex{display:flex}.flex-1{flex:1}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-1{gap:4px}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.mt-1{margin-top:4px}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}.ml-1{margin-left:4px}.ml-2{margin-left:8px}.mr-1{margin-right:4px}.mr-2{margin-right:8px}.text-muted{color:var(--text-muted)}.text-subtle{color:var(--text-subtle)}.text-sm{font-size:13px}.text-xs{font-size:11px}.text-center{text-align:center}.font-semibold{font-weight:600}.font-bold{font-weight:700}.empty{text-align:center;color:var(--text-muted);padding:36px 20px;font-size:13px}.progress{background:var(--bg);border-radius:999px;height:8px;overflow:hidden}.progress-fill{background:var(--primary);border-radius:999px;height:100%}.question-block{background:var(--surface);border:1px solid 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var(--border);border-radius:10px;flex-direction:column;display:flex}.chat-messages{flex:1;padding:16px;overflow-y:auto}.msg{border-radius:10px;max-width:70%;margin-bottom:10px;padding:8px 12px;font-size:13px}.msg.mine{background:var(--primary);color:#fff;margin-left:auto}.msg.theirs{background:var(--bg);border:1px solid var(--border)}.chat-input{border-top:1px solid var(--border);gap:8px;padding:12px;display:flex}.schedule-grid{background:var(--border);border-radius:10px;grid-template-columns:80px repeat(5,1fr);gap:1px;display:grid;overflow:hidden}.schedule-cell{background:var(--surface);min-height:60px;padding:10px;font-size:12px}.schedule-cell.header{background:var(--bg);text-align:center;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:600}.schedule-cell.lesson{flex-direction:column;gap:2px;display:flex}.schedule-cell .subj{color:var(--text);font-weight:600}.schedule-cell .meta{color:var(--text-muted);font-size:11px}.notif-list{flex-direction:column;gap:8px;display:flex}.notif{background:var(--surface);border:1px solid var(--border);border-radius:8px;align-items:flex-start;gap:12px;padding:12px 14px;transition:all .12s;display:flex}.notif:hover{border-color:var(--border-strong);background:var(--bg)}.notif.unread{background:var(--primary-light);border-color:#1e3a8a33}.notif .dot{background:var(--primary);border-radius:50%;flex-shrink:0;width:6px;height:6px;margin-top:6px}.notif-popover{background:var(--surface);border:1px solid var(--border);width:380px;max-height:480px;box-shadow:var(--shadow-lg);z-index:100;border-radius:12px;flex-direction:column;display:flex;position:absolute;top:calc(100% + 8px);right:0;overflow:hidden}.notif-popover-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 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.meta-row{color:var(--text-muted);flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:12px;font-size:12px;display:flex}.detail-card .meta-row .badge{font-size:10px}