:root {
    --primary: #25D366;
    --primary-dark: #128C7E;
    --secondary: #075E54;
    --background: #0a0a0a;
    --surface: #1a1a1a;
    --surface-light: #2a2a2a;
    --text: #ffffff;
    --text-muted: #888888;
    --border: #333333;
    --success: #25D366;
    --warning: #FFB800;
    --error: #FF5252;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text);
    min-height: 100vh;
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 32px;
    padding: 0 8px;
}

.sidebar-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 4px;
}

.nav-links a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
}

.nav-links a:hover {
    background: var(--surface-light);
    color: var(--text);
}

.nav-links a.active {
    background: rgba(37, 211, 102, 0.1);
    color: var(--primary);
}

.nav-links .icon {
    font-size: 1.25rem;
}

/* Main Content */
.content {
    flex: 1;
    margin-left: 260px;
    padding: 24px 32px;
    min-height: 100vh;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.topbar h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.stat-card.highlight {
    background: var(--gradient);
    border: none;
}

.stat-icon {
    font-size: 2rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.stat-card.highlight .stat-label {
    color: rgba(255, 255, 255, 0.8);
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.card h3 {
    margin-bottom: 20px;
    font-weight: 600;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.loading {
    text-align: center;
    color: var(--text-muted);
    padding: 32px;
}

/* Status Badges */
.status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-confirmed {
    background: rgba(37, 211, 102, 0.15);
    color: var(--success);
}

.status-cancelled {
    background: rgba(255, 82, 82, 0.15);
    color: var(--error);
}

.status-completed {
    background: rgba(136, 136, 136, 0.15);
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-danger {
    background: rgba(255, 82, 82, 0.15);
    color: var(--error);
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--surface);
    border-radius: 16px;
    padding: 32px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .content {
        margin-left: 0;
        padding: 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}