:root{--bg: #0f1419;--surface: #1a2332;--surface-hover: #243044;--border: #2d3a4f;--text: #e8edf4;--muted: #8b9cb3;--accent: #3d9cf5;--accent-dim: #2a6fad;--success: #34c759;--danger: #ff5c5c;--warning: #f5a623;font-family:DM Sans,system-ui,sans-serif;line-height:1.5;color:var(--text);background:var(--bg)}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh}a{color:var(--accent);text-decoration:none}button,input,select{font:inherit}.container{max-width:1100px;margin:0 auto;padding:1.5rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.6rem 1rem;border-radius:8px;border:none;cursor:pointer;font-weight:600;transition:background .15s,opacity .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-dim)}.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-ghost:hover{background:var(--surface-hover)}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:.35rem .65rem;font-size:.875rem}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.35rem;font-size:.875rem;color:var(--muted)}.form-group input,.form-group select{width:100%;padding:.6rem .75rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text)}.form-group input:focus,.form-group select:focus{outline:2px solid var(--accent);border-color:transparent}.error-banner{background:#ff5c5c26;border:1px solid var(--danger);color:#ffb4b4;padding:.75rem 1rem;border-radius:8px;margin-bottom:1rem;font-size:.9rem}.success-banner{background:#34c7591f;border:1px solid var(--success);color:#9ae6b0;padding:.75rem 1rem;border-radius:8px;margin-bottom:1rem}.nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-bottom:1px solid var(--border);background:var(--surface)}.nav-brand{font-weight:700;font-size:1.1rem}.nav-links{display:flex;gap:1rem;align-items:center}.nav-links a.active{color:var(--accent);font-weight:600}table{width:100%;border-collapse:collapse;font-size:.9rem}th,td{text-align:left;padding:.6rem .5rem;border-bottom:1px solid var(--border)}th{color:var(--muted);font-weight:500}.badge{display:inline-block;padding:.15rem .5rem;border-radius:999px;font-size:.75rem;font-weight:600}.badge-success{background:#34c75933;color:var(--success)}.badge-failed,.badge-danger{background:#ff5c5c33;color:var(--danger)}.badge-secondary{background:#8b9cb333;color:var(--muted)}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}@media (max-width: 768px){.grid-2{grid-template-columns:1fr}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem}.auth-card{width:100%;max-width:400px}.auth-card h1{margin-bottom:.25rem}.auth-card p.sub{color:var(--muted);margin-bottom:1.5rem;font-size:.95rem}.week-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:.5rem}.day-column{min-height:200px}.day-header{font-weight:600;font-size:.8rem;color:var(--muted);margin-bottom:.5rem;text-align:center}.class-slot{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.5rem;margin-bottom:.4rem;font-size:.8rem;cursor:pointer;transition:border-color .15s,background .15s}.class-slot:hover{border-color:var(--accent);background:var(--surface-hover)}.class-slot.selected{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.class-slot .time{font-weight:600;color:var(--accent)}.weekday-chips{display:flex;flex-wrap:wrap;gap:.5rem}.chip{padding:.4rem .75rem;border-radius:999px;border:1px solid var(--border);background:var(--bg);cursor:pointer;font-size:.85rem;-webkit-user-select:none;user-select:none}.chip.active{background:var(--accent);border-color:var(--accent);color:#fff}