:root {
    --dn4-primary: #ffc107;
    --dn4-secondary: #e0a800;
    --dn4-accent: #fd7e14;
    --dn4-light: #fff3cd;
    --dn4-border: #ffeaa7;
}

.dn4-box {
    width: 80%;
    max-width: 600px;
    margin: 0;
    background: white;
    border-radius: 16px;
    border: 4px solid var(--dn4-primary);
    box-shadow: 0 12px 40px rgba(255, 193, 7, 0.2);
    overflow: hidden;
    position: relative;
}

.dn4-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="15" cy="15" r="1.5" fill="rgba(255,193,7,0.05)"/><circle cx="85" cy="25" r="1" fill="rgba(255,193,7,0.05)"/><circle cx="25" cy="85" r="1.2" fill="rgba(255,193,7,0.05)"/><circle cx="75" cy="75" r="0.8" fill="rgba(255,193,7,0.05)"/></svg>');
    pointer-events: none;
}

.dn4-box-header {
    padding: 1.5rem 1.5rem 1rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.dn4-box-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--dn4-primary), var(--dn4-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    box-shadow: 0 8px 25px rgba(255, 193, 7, 0.3);
    position: relative;
    overflow: hidden;
}

.dn4-box-icon::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    50% { transform: translateX(100%) translateY(100%) rotate(45deg); }
    100% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
}

.dn4-box-letters {
    font-size: 1.6rem;
    font-weight: 900;
    color: white;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
    position: relative;
    z-index: 2;
    letter-spacing: 1px;
}

.dn4-box-title {
    font-size: 1.8rem;
    font-weight: 800;
    color: #2c3e50;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.dn4-box-subtitle {
    font-size: 1rem;
    color: #6c757d;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.dn4-box-description {
    font-size: 0.9rem;
    color: #495057;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.dn4-box-features {
    background: linear-gradient(135deg, var(--dn4-light), #fff);
    border: 2px solid var(--dn4-border);
    border-radius: 12px;
    padding: 0.8rem;
    margin: 0.5rem 0;
    position: relative;
    z-index: 1;
}

.dn4-box-feature-text {
    color: var(--dn4-secondary);
    font-weight: 700;
    font-size: 1rem;
    text-align: center;
    margin: 0;
    line-height: 1.5;
}

.dn4-box-actions {
    padding: 0 1rem 1.5rem;
    display: flex;
    gap: 1rem;
    position: relative;
    z-index: 1;
}

.btn-dn4 {
    flex: 1;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary-dn4 {
    background: linear-gradient(135deg, var(--dn4-primary), var(--dn4-secondary));
    color: white;
    box-shadow: 0 6px 20px rgba(255, 193, 7, 0.3);
}

.btn-primary-dn4:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(255, 193, 7, 0.4);
    color: white;
}

.btn-outline-dn4 {
    background: white;
    color: var(--dn4-secondary);
    border: 3px solid var(--dn4-primary);
    box-shadow: 0 6px 20px rgba(255, 193, 7, 0.15);
}

.btn-outline-dn4:hover {
    background: var(--dn4-primary);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(255, 193, 7, 0.3);
}

.btn-dn4::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-dn4:hover::before {
    left: 100%;
}


@media (max-width: 768px) {
    .dn4-box {
        margin: 0 1rem;
        border-radius: 16px;
    }
    .dn4-box-header {
        padding: 1.5rem 1rem;
    }
    .dn4-box-icon {
        width: 50px;
        height: 50px;
        border-radius: 10px;
    }
    .dn4-box-letters {
        font-size: 1.4rem;
    }
    .dn4-box-title {
        font-size: 1.5rem;
    }
    .dn4-box-subtitle {
        font-size: 0.9rem;
    }
    .dn4-box-description {
        font-size: 0.85rem;
    }
    .dn4-box-features {
        margin: 1rem;
        padding: 0.8rem 1rem;
    }
    .dn4-box-actions {
        padding: 0 1rem 1.5rem;
        flex-direction: column;
    }
    .btn-dn4 {
        padding: 0.8rem 1rem;
        font-size: 0.95rem;
    }
}

.dn4-box {
    animation: slideInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dn4-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(255, 193, 7, 0.25);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}