:root {
    --blockchain-blue: #0066cc;
    --crypto-gold: #ff9900;
    --block-green: #00cc66;
    --dark-chain: #0a1929;
}

body {
    background: linear-gradient(135deg, #0a1929 0%, #1a2b3c 100%);
    color: #e0f0ff;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.8;
}

.blockchain-container {
    max-width: 1100px;
    background: rgba(15, 30, 45, 0.95);
    border-radius: 20px;
    box-shadow: 
0 20px 60px rgba(0, 102, 204, 0.2),
inset 0 0 0 1px rgba(0, 102, 204, 0.1);
    margin: 40px auto;
    overflow: hidden;
    position: relative;
}

.blockchain-header {
    background: 
linear-gradient(135deg, rgba(0, 102, 204, 0.8) 0%, rgba(0, 51, 102, 0.9) 100%),
url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><rect width="20" height="20" fill="white" opacity="0.1"/></svg>');
    color: white;
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.chain-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.1;
}

.blockchain-title {
    font-size: 3.5rem;
    font-weight: 900;
    text-shadow: 0 0 30px rgba(0, 102, 204, 0.5);
    position: relative;
    z-index: 2;
    letter-spacing: 2px;
}

.blockchain-subtitle {
    font-size: 1.4rem;
    color: #88ccff;
    max-width: 800px;
    margin: 20px auto 0;
    position: relative;
    z-index: 2;
}

.content-area {
    padding: 50px;
    position: relative;
}

.section-title {
    color: var(--blockchain-blue);
    border-bottom: 3px solid var(--blockchain-blue);
    padding-bottom: 15px;
    margin: 50px 0 30px;
    font-size: 2.2rem;
    font-weight: 700;
}

.block-visual {
    background: rgba(0, 51, 102, 0.2);
    border: 2px solid var(--blockchain-blue);
    border-radius: 15px;
    padding: 25px;
    margin: 30px 0;
    position: relative;
}

.block {
    background: rgba(0, 102, 204, 0.1);
    border: 2px solid var(--blockchain-blue);
    border-radius: 10px;
    padding: 20px;
    margin: 15px 0;
    position: relative;
    transition: all 0.3s;
}

.block:hover {
    transform: translateX(10px);
    background: rgba(0, 102, 204, 0.2);
}

.block::before {
    content: '⬆';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--blockchain-blue);
    font-size: 1.5rem;
}

.crypto-joke {
    background: linear-gradient(135deg, rgba(255, 153, 0, 0.1) 0%, rgba(204, 102, 0, 0.1) 100%);
    border: 2px dashed var(--crypto-gold);
    border-radius: 15px;
    padding: 30px;
    margin: 35px 0;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.comparison-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-card h5 {
    color: var(--blockchain-blue);
    margin-bottom: 15px;
}

.mining-simulator {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    padding: 30px;
    margin: 40px 0;
    border: 2px solid var(--crypto-gold);
}

.hash-display {
    font-family: 'Courier New', monospace;
    background: #000;
    color: var(--block-green);
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    overflow-x: auto;
    font-size: 0.9rem;
}

.blockchain-btn {
    background: linear-gradient(135deg, var(--blockchain-blue), #004488);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

.blockchain-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 102, 204, 0.3);
}

.progress-chain {
    height: 30px;
    background: rgba(0, 102, 204, 0.1);
    border-radius: 15px;
    margin: 20px 0;
    overflow: hidden;
    position: relative;
}

.progress-chain-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--blockchain-blue), var(--block-green));
    border-radius: 15px;
    transition: width 1s;
    position: relative;
}

.progress-chain-fill::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 5px;
    background: white;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.use-case-card {
    background: rgba(0, 102, 204, 0.05);
    border-radius: 10px;
    padding: 25px;
    margin: 20px 0;
    border-left: 5px solid var(--blockchain-blue);
    transition: transform 0.3s;
}

.use-case-card:hover {
    transform: translateY(-5px);
    background: rgba(0, 102, 204, 0.1);
}

.word-count {
    color: #88aacc;
    font-size: 0.9rem;
    text-align: right;
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .blockchain-title {
font-size: 2.5rem;
    }
    .content-area {
padding: 25px;
    }
}