:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #10b981;
    --sidebar-width: 260px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--primary);
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1rem;
    border-radius: 0.75rem;
    text-decoration: none;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-item:hover,
.nav-item.active {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--text-main);
}

.nav-item.active {
    color: var(--primary);
}

.nav-item .material-symbols-rounded {
    font-size: 1.5rem;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 3rem;
    max-width: 1400px;
}

header {
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
}

.stat-card .label {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

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

/* Chart Layout - 3 Columns */
.chart-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.chart-container {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem;
    border-radius: 1.5rem;
    position: relative;
    height: 320px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.chart-container:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.chart-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin: 0;
}

.chart-value {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* Glow Effects */
.chart-container.cpu {
    border-bottom: 3px solid #ef4444;
}

.chart-container.ram {
    border-bottom: 3px solid #3b82f6;
}

.chart-container.net {
    border-bottom: 3px solid #a855f7;
}

.chart-wrapper {
    flex: 1;
    position: relative;
    width: 100%;
    min-height: 0;
}

@media (max-width: 768px) {
    .sidebar {
        width: 80px;
        padding: 2rem 1rem;
    }

    .logo span,
    .nav-item span:not(.material-symbols-rounded) {
        display: none;
    }

    .main-content {
        margin-left: 80px;
        padding: 1.5rem;
    }
}