* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --muted: #6b7280;
    --bg: #f3f4f6;
    --card-bg: #fff;
    --border: #e5e7eb;
    --nav-bg: #1e293b;
    --text: #111827;
}

body { font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.5; }

/* Nav */
.nav { display: flex; align-items: center; background: var(--nav-bg); color: #fff; padding: 0 20px; height: 52px; gap: 24px; }
.nav-brand { font-weight: 700; font-size: 16px; }
.nav-menu { display: flex; gap: 4px; flex: 1; }
.nav-link { color: #94a3b8; text-decoration: none; padding: 6px 12px; border-radius: 6px; font-size: 13px; }
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.1); }
.nav-right { display: flex; align-items: center; gap: 12px; }
.nav-user { font-size: 12px; color: #94a3b8; }
.btn-logout { color: #f87171 !important; font-size: 12px; }

/* Content */
.content { max-width: 1200px; margin: 0 auto; padding: 24px 20px; }
.page-header { margin-bottom: 20px; }
.page-header h2 { font-size: 20px; font-weight: 700; }

/* Card */
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 16px; overflow: hidden; }
.card-title { font-weight: 600; font-size: 14px; padding: 12px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }
.card-body { padding: 16px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }

/* Table */
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { font-weight: 600; background: #f9fafb; white-space: nowrap; }
.table-sm th, .table-sm td { padding: 6px 10px; }
.text-center { text-align: center; }
.text-muted { color: var(--muted); font-size: 13px; }
.text-success { color: var(--success); }

/* Badge */
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 600; background: #e5e7eb; color: #374151; }
.badge-master { background: #fef3c7; color: #92400e; }
.badge-admin { background: #dbeafe; color: #1e40af; }
.badge-customer { background: #d1fae5; color: #065f46; }
.badge-info { background: #dbeafe; color: #1e40af; }

/* Button */
.btn { display: inline-block; padding: 6px 14px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px; cursor: pointer; text-decoration: none; color: var(--text); background: #fff; }
.btn:hover { background: #f9fafb; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-sm { padding: 3px 10px; font-size: 12px; }
.btn-block { display: block; width: 100%; text-align: center; }

/* Form */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }

/* Alert */
.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 13px; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* Login */
.login-body { background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%); min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.login-box { background: #fff; padding: 40px; border-radius: 12px; width: 100%; max-width: 400px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.login-box h1 { font-size: 24px; text-align: center; margin-bottom: 4px; }
.login-subtitle { text-align: center; color: var(--muted); margin-bottom: 24px; }

/* Panel card */
.panel-card .card-title { background: #f0f9ff; }

/* Form row */
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* Fieldset */
.fieldset { border: 1px solid var(--border); border-radius: 6px; padding: 12px 16px; margin-bottom: 16px; }
.fieldset legend { font-size: 12px; font-weight: 700; color: var(--muted); padding: 0 6px; }

/* Modal */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.modal-content { background: #fff; border-radius: 12px; width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.modal-lg { max-width: 720px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { font-size: 16px; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--muted); }
.modal-content form { padding: 20px; }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; padding-top: 16px; border-top: 1px solid var(--border); margin-top: 8px; }

/* Circuit tree */
.panel-block { background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 12px; overflow: hidden; }
.panel-header { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; background: #f0f9ff; border-bottom: 1px solid var(--border); }
.panel-info { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.panel-icon { font-size: 18px; color: var(--primary); }
.panel-actions { display: flex; gap: 4px; flex-shrink: 0; }
.badge-panel { background: #dbeafe; color: #1e40af; }

.circuit-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.circuit-table th, .circuit-table td { padding: 6px 10px; text-align: left; border-bottom: 1px solid #f3f4f6; }
.circuit-table th { font-weight: 600; background: #fafbfc; font-size: 11px; color: var(--muted); text-transform: uppercase; }
.circuit-table tr:hover { background: #f9fafb; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); font-size: 15px; }