:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: linear-gradient(145deg, #14141e 0%, #0f0f17 100%);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(99, 102, 241, 0.3);
    --text-primary: #f4f4f7;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    --gradient-accent: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px var(--accent-glow);
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 12px 24px;
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: 24px;
}

.logo {
    width: 40px;
    height: 40px;
    background: var(--gradient-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
}

.nav-section {
    margin-bottom: 32px;
}

.nav-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 0 12px;
    margin-bottom: 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--gradient-accent);
    border-radius: 0 4px 4px 0;
    transition: height 0.2s ease;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--text-primary);
}

.nav-item.active::before {
    height: 24px;
}

.nav-icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
}

.nav-item.active .nav-icon,
.nav-item:hover .nav-icon {
    opacity: 1;
}

.nav-badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}

.sidebar-footer {
    margin-top: auto;
    padding: 16px 12px;
    border-top: 1px solid var(--border-subtle);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-name {
    font-weight: 500;
    font-size: 14px;
}

.user-role {
    font-size: 12px;
    color: var(--text-muted);
}

/* Main Content */
.main {
    flex: 1;
    margin-left: 260px;
    padding: 32px;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
    gap: 24px;
    flex-wrap: wrap;
}

.header-left h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 4px;
}

.header-left p {
    color: var(--text-secondary);
    font-size: 15px;
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-accent);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
}

.btn-sm {
    padding: 8px 14px;
    font-size: 13px;
}

/* Search Box */
.search-box {
    position: relative;
    width: 300px;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box svg {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.primary {
    background: var(--accent-glow);
    color: var(--accent-secondary);
}

.stat-icon.success {
    background: var(--success-bg);
    color: var(--success);
}

.stat-icon.warning {
    background: var(--warning-bg);
    color: var(--warning);
}

.stat-icon.danger {
    background: var(--danger-bg);
    color: var(--danger);
}

.stat-icon.info {
    background: var(--info-bg);
    color: var(--info);
}

.stat-trend {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: 20px;
}

.stat-trend.up {
    background: var(--success-bg);
    color: var(--success);
}

.stat-trend.down {
    background: var(--danger-bg);
    color: var(--danger);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
    font-family: 'JetBrains Mono', monospace;
}

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

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
}

.card-action {
    font-size: 13px;
    color: var(--accent-secondary);
    text-decoration: none;
    cursor: pointer;
}

.card-action:hover {
    color: var(--accent-primary);
}

.card-body {
    padding: 24px;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-subtle);
}

.data-table td {
    padding: 16px;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-subtle);
}

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

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.table-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.table-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.table-details h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
}

.table-details span {
    font-size: 12px;
    color: var(--text-muted);
}

.amount {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 14px;
}

.amount.credit {
    color: var(--success);
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

.status-badge.completed,
.status-badge.paid,
.status-badge.active {
    background: var(--success-bg);
    color: var(--success);
}

.status-badge.pending,
.status-badge.processing {
    background: var(--warning-bg);
    color: var(--warning);
}

.status-badge.failed,
.status-badge.overdue {
    background: var(--danger-bg);
    color: var(--danger);
}

.status-badge.draft {
    background: var(--info-bg);
    color: var(--info);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 10px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.filter-tab:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

.filter-tab.active {
    background: var(--accent-glow);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

/* Credit Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.credit-card {
    aspect-ratio: 1.586;
    border-radius: var(--radius-xl);
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.credit-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.3);
}

.credit-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
}

.credit-card.visa {
    background: linear-gradient(135deg, #1a1f71 0%, #2b3990 100%);
}

.credit-card.mastercard {
    background: linear-gradient(135deg, #eb001b 0%, #f79e1b 100%);
}

.credit-card.amex {
    background: linear-gradient(135deg, #006fcf 0%, #00aeef 100%);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.card-chip {
    width: 50px;
    height: 38px;
    background: linear-gradient(135deg, #ffd700, #ffb700);
    border-radius: 6px;
}

.card-brand-logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 2px;
}

.card-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 22px;
    letter-spacing: 4px;
    text-align: center;
}

.card-bottom {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.card-holder {
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 1px;
}

.card-holder span {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-top: 4px;
}

.card-expiry {
    text-align: right;
    font-size: 12px;
}

.card-expiry span {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    margin-top: 4px;
}

/* Invoice Number */
.invoice-number {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    color: var(--accent-secondary);
}

/* Chart Container */
.chart-container {
    height: 200px;
    position: relative;
    margin-top: 16px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 160px;
    padding: 0 8px;
}

.chart-bar-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.chart-bar {
    width: 32px;
    border-radius: 6px 6px 0 0;
    background: var(--gradient-accent);
    transition: all 0.3s ease;
    position: relative;
}

.chart-bar:hover {
    opacity: 0.8;
    transform: scaleY(1.05);
}

.chart-bar::before {
    content: attr(data-value);
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.chart-bar:hover::before {
    opacity: 1;
}

.chart-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Donut Chart */
.donut-chart {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 24px 0;
}

.donut {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: conic-gradient(
        var(--success) 0deg 144deg,
        var(--warning) 144deg 216deg,
        var(--danger) 216deg 252deg,
        var(--accent-primary) 252deg 360deg
    );
    position: relative;
}

.donut::before {
    content: '';
    position: absolute;
    inset: 30px;
    background: var(--bg-secondary);
    border-radius: 50%;
}

.donut-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.donut-value {
    font-size: 28px;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
}

.donut-label {
    font-size: 12px;
    color: var(--text-muted);
}

.donut-legend {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

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

.legend-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    margin-left: auto;
}

/* Customer Avatar */
.customer-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

/* Settings */
.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-subtle);
}

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

.settings-info h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}

.settings-info p {
    font-size: 13px;
    color: var(--text-muted);
}

/* Toggle Switch */
.toggle {
    width: 48px;
    height: 26px;
    background: var(--bg-tertiary);
    border-radius: 13px;
    position: relative;
    cursor: pointer;
    transition: background 0.2s ease;
}

.toggle.active {
    background: var(--accent-primary);
}

.toggle::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.2s ease;
}

.toggle.active::after {
    transform: translateX(22px);
}

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

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Activity Timeline */
.activity-timeline {
    position: relative;
    padding-left: 24px;
}

.activity-timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border-subtle);
}

.activity-item {
    position: relative;
    padding-bottom: 24px;
}

.activity-item:last-child {
    padding-bottom: 0;
}

.activity-item::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 2px solid var(--bg-secondary);
}

.activity-item.success::before {
    background: var(--success);
}

.activity-item.warning::before {
    background: var(--warning);
}

.activity-content h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 4px;
}

.activity-content p {
    font-size: 13px;
    color: var(--text-muted);
}

.activity-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.quick-action {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 24px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    color: var(--text-primary);
}

.quick-action:hover {
    border-color: var(--border-accent);
    transform: translateY(-2px);
}

.quick-action-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-secondary);
}

.quick-action span {
    font-size: 13px;
    font-weight: 500;
}

/* Payment Methods */
.payment-methods {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.payment-method {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.payment-method:hover {
    border-color: var(--border-accent);
}

.payment-method.default {
    border-color: var(--accent-primary);
    background: var(--accent-glow);
}

.pm-brand {
    width: 48px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 11px;
    color: white;
}

.pm-brand.visa {
    background: linear-gradient(135deg, #1a1f71, #2b3990);
}

.pm-brand.mc {
    background: linear-gradient(135deg, #eb001b, #f79e1b);
}

.payment-info h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.payment-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.default-badge {
    font-size: 10px;
    padding: 2px 8px;
    background: var(--accent-primary);
    color: white;
    border-radius: 10px;
    font-weight: 600;
}

/* Upcoming Bills */
.upcoming-bills {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.bill-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: transform 0.2s ease;
}

.bill-item:hover {
    transform: translateX(4px);
}

.bill-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
}

.bill-icon.netflix {
    background: #e50914;
}

.bill-icon.spotify {
    background: #1db954;
}

.bill-icon.aws {
    background: #ff9900;
}

.bill-info {
    flex: 1;
}

.bill-info h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
}

.bill-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.bill-amount {
    text-align: right;
}

.bill-amount .amount {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 15px;
}

.bill-amount .due {
    font-size: 11px;
    color: var(--warning);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 200;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

/* Responsive */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.open {
        display: block;
    }

    .main {
        margin-left: 0;
        padding: 80px 16px 24px;
    }

    .header {
        flex-direction: column;
    }

    .header-actions {
        width: 100%;
    }

    .search-box {
        width: 100%;
    }

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

    .donut-chart {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .header-left h1 {
        font-size: 22px;
    }

    .btn {
        padding: 10px 16px;
        font-size: 13px;
    }

    .stat-value {
        font-size: 24px;
    }

    .credit-card {
        padding: 20px;
    }

    .card-number {
        font-size: 16px;
        letter-spacing: 2px;
    }
}