body {
    background: #f7f9fc;
}

.area-hero {
    background: linear-gradient(135deg, #0b2b6b 0%, #1a4a8a 100%);
    color: #fff;
    padding: 90px 0 50px;
}

    .area-hero .hero-title {
        font-size: 36px;
        font-weight: 800;
        letter-spacing: .5px;
        margin: 0 0 12px;
        text-align: center;
    }

    .area-hero .hero-sub {
        opacity: .92;
        margin: 0;
        text-align: center;
        font-size: 16px;
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
    }

.letter-section {
    padding: 30px 0 50px;
}

.letter-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.letter-nav {
    background: white;
    border-radius: 8px;
    padding: 20px 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.letter-nav-bar {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.letter-nav-item {
    padding: 8px 10px;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 4px;
    text-decoration: none;
}

    .letter-nav-item:hover {
        color: #0b2b6b;
        background: #f0f0f0;
    }

    .letter-nav-item.active {
        color: #0b2b6b;
        background: #e6f2ff;
        font-weight: 600;
    }

    .letter-nav-item.all {
        color: #999;
    }

        .letter-nav-item.all.active {
            color: #666;
            background: #f0f0f0;
        }

.letter-title {
    font-size: 72px;
    font-weight: 800;
    color: #333;
    text-align: center;
    margin: 40px 0 30px;
    letter-spacing: 2px;
}

.tld-list-section {
    background: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.tld-columns {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px 30px;
    column-gap: 40px;
}

.tld-item {
    margin-bottom: 12px;
    font-size: 14px;
}

.tld-link {
    color: #0b2b6b;
    text-decoration: underline;
    cursor: pointer;
    transition: color 0.2s;
}

    .tld-link:hover {
        color: #096dd9;
    }

.tld-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: baseline;
}

    .tld-group .tld-link {
        white-space: nowrap;
    }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

    .empty-state p {
        font-size: 16px;
        margin: 0;
    }

@media (max-width: 1200px) {
    .tld-columns {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .tld-columns {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px 20px;
    }

    .letter-title {
        font-size: 48px;
    }

    .letter-nav-bar {
        gap: 10px;
    }

    .letter-nav-item {
        padding: 6px 12px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .tld-columns {
        grid-template-columns: 1fr;
    }
}