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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-green: #00d084;
    --accent-red: #ff4757;
    --accent-orange: #f7931a;
    --accent-purple: #627eea;
    --border-glass: rgba(255, 255, 255, 0.1);
    --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(247, 147, 26, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 80%, rgba(98, 126, 234, 0.1) 0%, transparent 40%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

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

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

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple), var(--text-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.last-updated {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Glassmorphism */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    box-shadow: var(--shadow-glass);
}

/* Crypto Section */
.crypto-section {
    margin-bottom: 3rem;
}

.crypto-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.crypto-icon {
    width: 48px;
    height: 48px;
    animation: pulse 2s ease-in-out infinite;
}

.crypto-icon.bitcoin {
    filter: drop-shadow(0 0 10px rgba(247, 147, 26, 0.4));
}

.crypto-icon.ethereum {
    filter: drop-shadow(0 0 10px rgba(98, 126, 234, 0.4));
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.crypto-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.crypto-symbol {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 1rem;
}

/* Price Cards */
.price-cards {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.price-card {
    padding: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.price-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.price-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-orange), #ffb347);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
}

.price-value.eth {
    background: linear-gradient(135deg, var(--accent-purple), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-change {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    width: fit-content;
    margin: 0 auto;
}

.price-change.positive {
    background: rgba(0, 208, 132, 0.15);
    color: var(--accent-green);
}

.price-change.negative {
    background: rgba(255, 71, 87, 0.15);
    color: var(--accent-red);
}

.change-indicator {
    font-size: 1.1rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.stats-grid.compact {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.stat-card {
    padding: 1.25rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Chart Container */
.chart-container {
    padding: 1.5rem;
}

.chart-container canvas {
    width: 100%;
    height: auto;
    max-height: 200px;
}

/* Footer */
.footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-glass);
    margin-top: 1rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    z-index: 1000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-glass);
    border-top-color: var(--accent-orange);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 900px) {
    .price-cards {
        grid-template-columns: 1fr;
    }
    
    .price-value {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header {
        flex-direction: column;
        text-align: center;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .crypto-header h2 {
        font-size: 1.25rem;
    }
    
    .price-value {
        font-size: 1.75rem;
    }
    
    .price-card {
        padding: 1.5rem;
    }
    
    .stats-grid.compact {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .chart-container {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .stats-grid.compact {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-value {
        font-size: 0.95rem;
    }
    
    .price-value {
        font-size: 1.5rem;
    }
}