:root {
    --bg-color: #05070a;
    --card-bg: rgba(20, 25, 35, 0.7);
    --accent-color: #00d4ff;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --font-family: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    background-image: radial-gradient(circle at 50% 0%, #1a202c 0%, #05070a 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.stat-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Chart Section */
.chart-section {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    margin-bottom: 3rem;
}

.secondary-chart {
    margin-top: 2rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

select {
    background: #1a202c;
    color: white;
    border: 1px solid var(--border-color);
    padding: 0.6rem 1rem;
    border-radius: 0.8rem;
    outline: none;
    cursor: pointer;
}

.time-filters {
    display: flex;
    gap: 0.5rem;
    background: #1a202c;
    padding: 0.3rem;
    border-radius: 0.8rem;
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 0.6rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.filter-btn.active {
    background: var(--accent-color);
    color: #000;
}

.chart-container {
    height: 450px;
    position: relative;
}

footer {
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .chart-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .controls {
        width: 100%;
        flex-direction: column;
    }
    select {
        width: 100%;
    }
    .time-filters {
        width: 100%;
        justify-content: space-between;
    }
}