body {
    background: linear-gradient(120deg, #eef3fb, #f9fcff);
    font-family: 'Inter', sans-serif;
    color: #1b2b45;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
}

.hero {
    background: #ffffff;
    border-radius: 22px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.05);
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease-in-out;
}

.hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.1);
}

.hero-title {
    font-size: 2.6rem;
    font-weight: 800;
    color: #1870f4;
    margin-bottom: 0.8rem;
}

.hero-badge,
.badge-os {
    display: inline-block;
    background: linear-gradient(to right, #ffdd57, #ffa600);
    color: #5a4100;
    font-size: 1rem;
    padding: 0.4em 1.2em;
    border-radius: 9999px;
    font-weight: 600;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px rgba(255, 204, 0, 0.2);
}

.download-btn {
    display: inline-block;
    background: linear-gradient(135deg, #34d399, #3b82f6);
    color: white;
    padding: 1rem 2.4rem;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 1.2rem;
    border: none;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 4px 14px rgba(52, 211, 153, 0.2);
}

.download-btn:hover {
    background: linear-gradient(135deg, #3b82f6, #34d399);
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(52, 211, 153, 0.3);
}

.guide-section {
    background: #ffffff;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
    margin-top: 2.5rem;
}

.guide-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 1rem;
}

.howto-list .list-group-item {
    background: #f9fbfe;
    border: 1px solid #e0e7ff;
    border-radius: 12px;
    margin-bottom: 1rem;
    padding: 1.2rem;
    font-size: 1.05rem;
    transition: background 0.2s ease-in-out;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.03);
}

.howto-list .list-group-item:hover {
    background: #eef3ff;
}

.howto-list code {
    background: #e5eaf9;
    color: #1e40af;
    padding: 3px 8px;
    border-radius: 6px;
}

.howto-list img {
    max-width: 100%;
    border-radius: 10px;
    margin-top: 0.8rem;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 2rem 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .download-btn {
        width: 100%;
    }

    .guide-section {
        padding: 1.5rem 1rem;
    }

    .guide-title {
        font-size: 1.3rem;
    }
}