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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #0f0f1e 100%);
    color: #ffffff;
    min-height: 100vh;
    padding: 40px 20px;
}

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

header {
    text-align: center;
    margin-bottom: 50px;
}

.baslik {
    font-size: 48px;
    color: #00ff88;
    text-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.alt-baslik {
    font-size: 18px;
    color: #00cc6a;
    opacity: 0.8;
}

.doviz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.doviz-kart {
    background: linear-gradient(145deg, #0f0f0f, #1f1f1f);
    border-radius: 20px;
    padding: 35px;
    text-align: center;
    box-shadow: 0 0 40px rgba(0, 255, 136, 0.15);
    border: 2px solid rgba(0, 255, 136, 0.3);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.doviz-kart:hover {
    transform: translateY(-8px);
    box-shadow: 0 0 60px rgba(0, 255, 136, 0.4);
    border-color: rgba(0, 255, 136, 0.6);
}

.doviz-kart::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, #00ff88, transparent);
}

.doviz-icon {
    font-size: 64px;
    margin-bottom: 15px;
    filter: drop-shadow(0 0 10px rgba(0, 255, 136, 0.5));
}

.doviz-adi {
    font-size: 20px;
    color: #00ff88;
    margin-bottom: 8px;
    font-weight: 600;
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.doviz-sembol {
    font-size: 14px;
    color: #00cc6a;
    margin-bottom: 20px;
    opacity: 0.7;
}

.doviz-kur {
    font-size: 42px;
    font-weight: bold;
    color: #ffffff;
    margin-bottom: 15px;
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.8);
    font-variant-numeric: tabular-nums;
}

.doviz-degisim {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0.3);
}

.doviz-degisim.yukari {
    color: #00ff88;
    border: 1px solid rgba(0, 255, 136, 0.3);
}

.doviz-degisim.asagi {
    color: #ff4757;
    border: 1px solid rgba(255, 71, 87, 0.3);
}

.ok {
    font-size: 20px;
}

footer {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 15px;
    border: 1px solid rgba(0, 255, 136, 0.2);
}

footer p {
    color: #00cc6a;
    font-size: 14px;
}

#sonGuncelleme {
    color: #00ff88;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

@media (max-width: 768px) {
    .baslik {
        font-size: 32px;
    }
    
    .doviz-grid {
        grid-template-columns: 1fr;
    }
    
    .doviz-kur {
        font-size: 32px;
    }
}