:root{--bg: #0b0f19;--card: #131a26;--card-glass: rgba(19, 26, 38, .7);--border: rgba(255, 255, 255, .08);--border-focus: #fbbf24;--text: #c5d1ec;--text-muted: #6a7c9d;--text-light: #ffffff;--primary: #fbbf24;--primary-hover: #f59e0b;--primary-trans: rgba(251, 191, 36, .1);--danger: #ef4444;--danger-hover: #dc2626;--danger-trans: rgba(239, 68, 68, .1);--success: #10b981;--success-trans: rgba(16, 185, 129, .1);--transition: all .25s cubic-bezier(.4, 0, .2, 1);--shadow: 0 10px 30px -10px rgba(0, 0, 0, .7)}body{margin:0;padding:0;background-color:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.glass-card{background:var(--card-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}input,select,textarea{background:#0b0f19b3;border:1px solid var(--border);border-radius:8px;padding:.65rem .85rem;color:var(--text-light);font-size:.9rem;transition:var(--transition);outline:none;width:100%;box-sizing:border-box}input:focus,select:focus,textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px var(--primary-trans)}button{cursor:pointer;border-radius:8px;padding:.65rem 1.25rem;font-size:.9rem;font-weight:600;transition:var(--transition);border:1px solid 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var(--border);text-transform:uppercase;font-size:.75rem;letter-spacing:.05em}td{padding:.85rem 1.25rem;border-bottom:1px solid var(--border);color:var(--text);white-space:nowrap;max-width:300px;overflow:hidden;text-overflow:ellipsis}tr:hover td{background-color:#ffffff03}.badge{display:inline-flex;align-items:center;padding:.2rem .6rem;border-radius:50px;font-size:.75rem;font-weight:600}.badge-exams{background-color:var(--primary-trans);color:var(--primary);border:1px solid rgba(251,191,36,.15)}.badge-books{background-color:var(--success-trans);color:var(--success);border:1px solid rgba(16,185,129,.15)}.badge-projects{background-color:#3b82f61a;color:#60a5fa;border:1px solid rgba(59,130,246,.15)}.alert{padding:.85rem 1.25rem;border-radius:8px;border:1px solid transparent;font-size:.9rem;display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.alert-error{background-color:var(--danger-trans);border-color:#ef444433;color:#fca5a5}.alert-success{background-color:var(--success-trans);border-color:#10b98133;color:#a7f3d0}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1rem}.form-group{display:flex;flex-direction:column;gap:.4rem}.form-group label{font-size:.8rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.02em}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0b0f19cc;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{width:100%;max-width:500px;box-sizing:border-box;margin:1.5rem}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem;margin-bottom:1.5rem}.stat-card{background:var(--card-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:12px;padding:1.25rem;display:flex;flex-direction:column;gap:.5rem;transition:var(--transition)}.stat-card:hover{border-color:#fbbf2433;transform:translateY(-2px)}.stat-card .stat-icon{font-size:1.5rem}.stat-card .stat-value{font-size:1.75rem;font-weight:700;color:#fff}.stat-card 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.activity-text{flex:1;color:var(--text)}.activity-item .activity-time{font-size:.75rem;color:var(--text-muted);flex-shrink:0}.chart-bars{display:flex;align-items:flex-end;gap:6px;height:120px;padding:.5rem 0}.chart-bar{flex:1;background:linear-gradient(180deg,var(--primary) 0%,rgba(251,191,36,.3) 100%);border-radius:4px 4px 0 0;min-height:4px;transition:var(--transition);position:relative}.chart-bar:hover{opacity:.8}.chart-label{display:flex;justify-content:space-between;font-size:.7rem;color:var(--text-muted);margin-top:.35rem}.filter-pills{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1rem}.filter-pill{padding:.35rem .75rem;border-radius:50px;font-size:.8rem;font-weight:500;background:transparent;border:1px solid var(--border);color:var(--text-muted);cursor:pointer;transition:var(--transition)}.filter-pill.active{background:var(--primary-trans);border-color:#fbbf244d;color:var(--primary)}.filter-pill:hover{border-color:#fbbf2433}.user-status{width:8px;height:8px;border-radius:50%;display:inline-block;margin-right:.35rem}.user-status.online{background:var(--success);box-shadow:0 0 6px #10b98166}.user-status.offline{background:var(--text-muted)}