/* Variables */
:root {
    --bg-dark: #1a1d21;
    --bg-darker: #13161a;
    --bg-card: #22262c;
    --bg-hover: #2a2f36;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-color: #374151;
    --accent-blue: #3b82f6;
    --accent-green: #22c55e;
    --accent-yellow: #f59e0b;
    --accent-red: #ef4444;
    --radius: 8px;
    --radius-lg: 12px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* Loading */
.loading-screen, .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-secondary);
}

.loading-screen {
    min-height: 100vh;
}

/* Login */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border-color);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    transition: border-color 0.2s;
}

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

.form-group input::placeholder {
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #2563eb;
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-hover);
}

.btn-link {
    background: transparent;
    color: var(--accent-blue);
    padding: 8px;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 12px;
    font-size: 13px;
}

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

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
}

/* App Layout */
.app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-darker);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 22px;
    font-weight: 700;
}

.sidebar-header span {
    font-size: 12px;
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
    padding: 4px 8px;
    border-radius: 4px;
    margin-left: 8px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
}

.nav-item {
    display: block;
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius);
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 4px;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-blue);
    color: white;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

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

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.page-header h2 {
    flex: 1;
    font-size: 24px;
    font-weight: 700;
}

/* Dashboard */
.dashboard h2 {
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.stat-card.success .stat-value { color: var(--accent-green); }
.stat-card.warning .stat-value { color: var(--accent-yellow); }
.stat-card.danger .stat-value { color: var(--accent-red); }
.stat-card.primary .stat-value { color: var(--accent-blue); }

/* Tables */
.table-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

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

.table th,
.table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: var(--bg-darker);
}

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

.table tbody tr:last-child td {
    border-bottom: none;
}

.mono {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 13px;
}

/* Badges & Status */
.badge {
    display: inline-block;
    padding: 4px 10px;
    font-size: 13px;
    font-weight: 600;
    background: var(--accent-blue);
    color: white;
    border-radius: 50px;
}

.status {
    display: inline-block;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
}

.status.active, .status.online {
    background: rgba(34, 197, 94, 0.1);
    color: var(--accent-green);
}

.status.inactive, .status.offline {
    background: rgba(107, 114, 128, 0.1);
    color: var(--text-muted);
}

/* Actions */
.actions {
    display: flex;
    gap: 8px;
}

/* Modals */
.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;
    padding: 20px;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 480px;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Sections */
.section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title.warning {
    color: var(--accent-yellow);
}

/* Client Detail */
.client-info {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 32px;
    border: 1px solid var(--border-color);
}

.info-row {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-row .label {
    width: 120px;
    color: var(--text-muted);
    font-size: 14px;
}

/* Utilities */
.text-muted {
    color: var(--text-muted);
}

.text-warning {
    color: var(--accent-yellow);
}

.empty {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 80px;
    }
    .sidebar-header h1,
    .sidebar-header span,
    .nav-item span,
    .user-info {
        display: none;
    }
    .main-content {
        margin-left: 80px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
        padding: 16px;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}