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

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --green: #22c55e;
    --red: #ef4444;
    --yellow: #eab308;
    --blue: #3b82f6;
    --sidebar-width: 240px;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-nav {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s ease;
}

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

.nav-item.active {
    background: var(--accent);
    color: #fff;
}

/* Main */
.main {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 14px;
    flex: 1;
    max-width: 400px;
}

.search-bar input {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    width: 100%;
}

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

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

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    position: relative;
    transition: background 0.15s;
}

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

.badge {
    position: absolute;
    top: 2px;
    right: 2px;
    background: var(--red);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 5px;
    border-radius: 10px;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
}

/* Content */
.content {
    padding: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
}

/* Stat cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: border-color 0.15s;
}

.stat-card:hover {
    border-color: var(--accent);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.revenue { background: rgba(99,102,241,0.15); color: var(--accent); }
.stat-icon.users { background: rgba(59,130,246,0.15); color: var(--blue); }
.stat-icon.orders { background: rgba(34,197,94,0.15); color: var(--green); }
.stat-icon.conversion { background: rgba(234,179,8,0.15); color: var(--yellow); }

.stat-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
}

.stat-change {
    font-size: 12px;
    font-weight: 600;
}

.stat-change.positive { color: var(--green); }
.stat-change.negative { color: var(--red); }

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.card-select {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    padding: 6px 10px;
    font-size: 13px;
    cursor: pointer;
}

/* Chart */
.charts-row {
    margin-bottom: 24px;
}

.chart-container {
    padding: 20px;
    height: 280px;
}

/* Table */
.bottom-row {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 24px;
}

.table-wrapper {
    overflow-x: auto;
}

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

th, td {
    padding: 12px 20px;
    text-align: left;
    font-size: 14px;
    white-space: nowrap;
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--border);
}

th:hover {
    color: var(--text-primary);
}

.sort-icon {
    font-size: 12px;
    margin-left: 4px;
    opacity: 0.5;
}

th.sorted .sort-icon {
    opacity: 1;
    color: var(--accent);
}

td {
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

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

tr:hover td {
    background: rgba(99,102,241,0.04);
}

.status-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.completed { background: rgba(34,197,94,0.15); color: var(--green); }
.status-badge.pending { background: rgba(234,179,8,0.15); color: var(--yellow); }
.status-badge.cancelled { background: rgba(239,68,68,0.15); color: var(--red); }
.status-badge.processing { background: rgba(59,130,246,0.15); color: var(--blue); }

/* Activity */
.activity-list {
    padding: 12px 20px;
}

.activity-item {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 6px;
    flex-shrink: 0;
}

.activity-dot.green { background: var(--green); }
.activity-dot.blue { background: var(--blue); }
.activity-dot.yellow { background: var(--yellow); }
.activity-dot.red { background: var(--red); }

.activity-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.activity-content strong {
    color: var(--text-primary);
}

.activity-time {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
    display: block;
}

/* Responsive */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bottom-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .main {
        margin-left: 0;
    }

    .menu-toggle {
        display: block;
    }

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

    .search-bar {
        max-width: none;
    }
}