:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --danger-color: #dc2626;
    --success-color: #16a34a;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1d4ed8 100%);
    color: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    background-color: var(--card-bg);
    padding: 10px;
    border-radius: 8px 8px 0 0;
    box-shadow: var(--shadow);
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: white;
}

/* Tab content */
.tab-content {
    display: none;
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 0 0 8px 8px;
    box-shadow: var(--shadow);
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Controls */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--bg-color);
    border-radius: 6px;
}

.pagination-info {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
}

thead {
    background-color: var(--bg-color);
}

th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

tbody tr:hover {
    background-color: var(--bg-color);
}

.loading {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px !important;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #b91c1c;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Property rows */
.property-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1.5fr 1fr auto;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

#properties-container {
    margin-bottom: 15px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
    padding: 15px;
}

#page-info {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Stats */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.stat-card:nth-child(2) {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stat-card:nth-child(3) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.stat-card h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    opacity: 0.9;
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.stats-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    backdrop-filter: blur(10px);
}

.stat-item-label {
    font-weight: 500;
}

.stat-item-value {
    font-weight: 700;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--danger-color);
}

/* Result messages */
.result-message {
    padding: 15px;
    border-radius: 6px;
    margin-top: 20px;
}

.result-message.success {
    background-color: #dcfce7;
    color: #166534;
    border-left: 4px solid var(--success-color);
}

.result-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

/* Properties display */
.properties-display {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.property-badge {
    background-color: var(--bg-color);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

.property-badge strong {
    color: var(--primary-color);
}

/* Designation preview */
.designation-preview {
    padding: 15px;
    background-color: var(--bg-color);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 10px;
    border: 2px dashed var(--border-color);
}

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Action buttons in table */
.action-buttons {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.edit-btn {
    background-color: var(--primary-color);
    color: white;
}

.edit-btn:hover {
    background-color: var(--primary-hover);
}

.delete-btn {
    background-color: var(--danger-color);
    color: white;
}

.delete-btn:hover {
    background-color: #b91c1c;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .property-row {
        grid-template-columns: 1fr;
    }

    .stats-container {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    table {
        font-size: 0.875rem;
    }

    th, td {
        padding: 8px;
    }
}

/* Property hints */
.property-hints {
    margin-bottom: 15px;
}

.info-box {
    background-color: #e0f2fe;
    border-left: 4px solid var(--primary-color);
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.info-box strong {
    color: var(--primary-color);
}

.info-box small {
    color: var(--text-secondary);
    font-style: italic;
}

/* Property row redesign */
.property-row {
    display: grid;
    grid-template-columns: 200px 1fr auto 40px;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.property-label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.95rem;
}

.property-unit-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0 5px;
}

.property-row-custom {
    grid-template-columns: 200px 1fr auto 40px;
}

.property-select {
    min-width: 200px;
}