:root{--navy:#1e3a5f;--navy-2:#2c5282;--gold:#d6b35c;--gold-2:#c9a245;--bg:#f6f7f9;--bg-2:#e9ecef;--surface:#fff;--border:#e5e7eb;--text:#111827;--text-muted:#6b7280;--text-faint:#9ca3af;--success-bg:#d1fae5;--success-text:#065f46;--success-border:#10b981;--error-bg:#fee2e2;--error-text:#991b1b;--error-border:#ef4444;--warn-bg:#fef3c7;--warn-text:#92400e;--warn-border:#f59e0b;--radius:12px;--radius-sm:8px;--shadow:0 2px 12px #00000014;--shadow-hover:0 4px 16px #d6b35c2e}*{box-sizing:border-box;margin:0;padding:0}body{background:linear-gradient(135deg, var(--bg) 0%, var(--bg-2) 100%);color:var(--text);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,Arial,sans-serif}button{font-family:inherit}.app-shell{min-height:100vh;display:flex}.sidebar{background:linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);color:#fff;flex-direction:column;flex-shrink:0;gap:4px;width:240px;padding:24px 16px;display:flex}.sidebar-brand{border-bottom:1px solid #ffffff26;margin-bottom:16px;padding:0 12px 20px;font-size:15px;font-weight:700;line-height:1.4}.sidebar-logo{width:100%;max-width:160px;height:auto;display:block}.nav-link{border-radius:var(--radius-sm);color:#fffc;cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:10px;width:100%;padding:10px 12px;font-size:14px;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.nav-link:hover{color:#fff;background:#ffffff14}.nav-link.active{color:#fff;background:#d6b35c40;font-weight:700}.sidebar-footer{border-top:1px solid #ffffff26;margin-top:auto;padding-top:16px}.main-content{flex:1;max-width:1400px;padding:32px 40px}.page-header{justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:24px;display:flex}.page-header h1{color:var(--navy);margin-bottom:4px;font-size:24px;font-weight:700}.page-header p{color:var(--text-muted);font-size:14px}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:20px;padding:24px}.section-title{color:var(--navy);border-bottom:2px solid var(--gold);margin-bottom:16px;padding-bottom:10px;font-size:16px;font-weight:700}.controls-row{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:18px;display:flex}input[type=text],input[type=email],input[type=date],input[type=number],input[type=password],select,textarea{border:2px solid var(--border);color:var(--text);background:#fff;border-radius:10px;width:100%;padding:10px 14px;font-family:inherit;font-size:14px;transition:all .2s}textarea{resize:vertical;min-height:90px}input:focus,select:focus,textarea:focus{border-color:var(--gold);outline:none;box-shadow:0 0 0 3px #d6b35c1f}input::placeholder{color:var(--text-faint)}.search-input{flex:1;min-width:260px}.btn{cursor:pointer;white-space:nowrap;border:none;border-radius:10px;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--gold) 0%, var(--gold-2) 100%);color:var(--navy);box-shadow:0 4px 12px #d6b35c4d}.btn-primary:hover:not(:disabled){background:linear-gradient(135deg, #e0c070 0%, var(--gold) 100%);transform:translateY(-1px)}.btn-secondary{color:var(--navy);border:2px solid var(--border);background:#fff}.btn-secondary:hover:not(:disabled){border-color:var(--gold);background:#f3f4f6}.btn-danger{color:var(--error-border);background:#fff;border:2px solid #fecaca}.btn-danger:hover:not(:disabled){background:var(--error-bg)}.btn-small{padding:6px 14px;font-size:13px}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important}.data-table{border-collapse:collapse;width:100%}.data-table th{text-align:left;text-transform:uppercase;letter-spacing:.4px;color:var(--text-faint);border-bottom:2px solid var(--border);padding:10px 12px;font-size:11px;font-weight:700}.data-table td{border-bottom:1px solid var(--border);vertical-align:top;padding:12px;font-size:14px}.data-table tr:hover td{background:#fafafa}.row-actions{justify-content:flex-end;gap:8px;display:flex}.muted{color:var(--text-faint)}.badge{text-transform:uppercase;letter-spacing:.3px;border-radius:999px;align-items:center;gap:6px;padding:4px 10px;font-size:11px;font-weight:700;display:inline-flex}.badge.success{background:var(--success-bg);color:var(--success-text);border:1px solid var(--success-border)}.badge.warning{background:var(--warn-bg);color:var(--warn-text);border:1px solid var(--warn-border)}.badge.info{color:#1e3a8a;background:#dbeafe;border:1px solid #3b82f6}.badge.neutral{color:#4b5563;border:1px solid var(--border);background:#f3f4f6}.form-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.form-group{flex-direction:column;gap:6px;display:flex}.form-group.span-2{grid-column:span 2}.form-group label{color:#374151;font-size:13px;font-weight:600}.required{color:var(--error-border)}.alert{border-radius:10px;align-items:center;gap:10px;margin-bottom:18px;padding:14px 18px;font-size:14px;display:flex}.alert-success{background:var(--success-bg);border-left:4px solid var(--success-border);color:var(--success-text)}.alert-error{background:var(--error-bg);border-left:4px solid var(--error-border);color:var(--error-text)}.modal-backdrop{z-index:999;background:#00000080;justify-content:center;align-items:flex-start;padding:40px 20px;display:flex;position:fixed;inset:0;overflow-y:auto}.modal{background:#fff;border-radius:14px;width:min(760px,100%);box-shadow:0 20px 60px #0000004d}.modal-header{background:linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);color:#fff;border-radius:14px 14px 0 0;justify-content:space-between;align-items:center;padding:18px 24px;display:flex}.modal-header h3{font-size:17px;font-weight:700}.modal-close{color:#fff;cursor:pointer;background:#ffffff26;border:1px solid #ffffff40;border-radius:8px;width:30px;height:30px;font-size:16px}.modal-body{max-height:70vh;padding:24px;overflow-y:auto}.modal-footer{border-top:2px solid var(--border);background:#f9fafb;border-radius:0 0 14px 14px;justify-content:flex-end;gap:12px;padding:16px 24px;display:flex}.empty-state{text-align:center;color:var(--text-muted);padding:50px 20px}.empty-state .icon{opacity:.5;margin-bottom:10px;font-size:44px}.login-screen{justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.login-card{background:#fff;border-radius:16px;width:min(380px,100%);padding:36px 32px;box-shadow:0 8px 30px #0000001f}.login-logo{width:100%;max-width:220px;height:auto;margin:0 auto 20px;display:block}.login-card h1{color:var(--navy);text-align:center;margin-bottom:6px;font-size:20px}.login-card p{color:var(--text-muted);text-align:center;margin-bottom:24px;font-size:13px}.login-card form{flex-direction:column;gap:14px;display:flex}.login-card .btn{justify-content:center;margin-top:6px}.turma-meta{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:20px;margin-bottom:20px;padding-bottom:18px;display:flex}.turma-meta .item{flex-direction:column;gap:4px;display:flex}.turma-meta .label{text-transform:uppercase;color:var(--text-faint);letter-spacing:.4px;font-size:11px;font-weight:600}.turma-meta .value{color:#374151;font-size:14px;font-weight:500}@media (width<=900px){.app-shell{flex-direction:column}.sidebar{flex-direction:row;width:100%;padding:12px;overflow-x:auto}.sidebar-brand,.sidebar-footer{display:none}.main-content{padding:20px}.form-grid{grid-template-columns:1fr}.form-group.span-2{grid-column:span 1}}