*,*:before,*:after{box-sizing:border-box}:root{--bg: #0f1419;--bg-card: #1a2332;--border: #2a3a4d;--text: #e8eef4;--text-muted: #8b9cb3;--accent: #5eb8ff;--accent-dim: #3a7ab8;--danger: #ff6b6b;--success: #69db7c;font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.5;color:var(--text);background:var(--bg)}body{margin:0;min-height:100vh}a{color:var(--accent)}.page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(ellipse at 20% 20%,rgba(94,184,255,.08) 0%,transparent 50%),radial-gradient(ellipse at 80% 80%,rgba(105,219,124,.05) 0%,transparent 50%),var(--bg)}.card{width:100%;max-width:420px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:32px;box-shadow:0 8px 32px #0006}.card-wide{max-width:520px}.title{margin:0 0 8px;font-size:1.5rem;font-weight:600;text-align:center}.subtitle{margin:0 0 24px;text-align:center;color:var(--text-muted);font-size:.9rem}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-size:.875rem;color:var(--text-muted)}input[type=email],input[type=password],input[type=text]{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);font-size:1rem}input:focus{outline:none;border-color:var(--accent)}.btn{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:11px 16px;border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:background .15s}.btn-primary{background:var(--accent);color:#0f1419}.btn-primary:hover:not(:disabled){background:#7ec8ff}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border);width:auto;padding:8px 16px}.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}.error-msg{margin-bottom:16px;padding:10px 12px;background:#ff6b6b1f;border:1px solid rgba(255,107,107,.3);border-radius:8px;color:var(--danger);font-size:.875rem}.footer-link{margin-top:20px;text-align:center;font-size:.875rem;color:var(--text-muted)}.class-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}.class-option{padding:16px;border:2px solid var(--border);border-radius:10px;cursor:pointer;text-align:center;transition:border-color .15s,background .15s}.class-option:hover{border-color:var(--accent-dim)}.class-option.selected{border-color:var(--accent);background:#5eb8ff14}.class-option .name{font-weight:600;margin-bottom:4px}.class-option .desc{font-size:.75rem;color:var(--text-muted)}.panel{max-width:480px;width:100%}.panel-wide{max-width:560px}.panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.panel-header h1{margin:0;font-size:1.25rem}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat-item{padding:14px;background:var(--bg);border:1px solid var(--border);border-radius:8px}.stat-item .label{font-size:.75rem;color:var(--text-muted);margin-bottom:4px}.stat-item .value{font-size:1.125rem;font-weight:600}.divider{height:1px;background:var(--border);margin:20px 0}.meta{font-size:.8rem;color:var(--text-muted)}.badge{display:inline-block;padding:4px 10px;background:#5eb8ff26;border-radius:20px;font-size:.8rem;color:var(--accent)}