/* Modern Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #2d3748;
    background-color: #f7fafc;
    line-height: 1.6;
    padding-bottom: 40px;
}

/* Header Navigation */
header {
    background-color: #1a202c; /* Deep industrial slate */
    color: #ffffff;
    padding: 1.25rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* Main Container Layout */
main {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1.5rem;
}

/* Typography & Product Details */
h2 {
    font-size: 2.25rem;
    font-weight: 800;
    color: #111827;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

p {
    font-size: 1.125rem;
    color: #4a5568;
    margin-bottom: 1.5rem;
}

p strong {
    color: #1a202c;
}

h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #1a202c;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Specifications List */
ul {
    list-style-type: none;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 2.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

ul li {
    font-size: 1.05rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid #edf2f7;
    display: flex;
    justify-content: space-between;
}

ul li:last-child {
    border-bottom: none;
}

ul li strong {
    color: #718096;
    font-weight: 500;
}

/* High-Conversion CTA Box */
.cta-box {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 2px solid #ed8936; /* Construction orange accent */
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 0 10px 15px -3px rgba(237, 137, 54, 0.1), 0 4px 6px -2px rgba(237, 137, 54, 0.05);
    margin: 3rem;
}

.cta-box h3 {
    color: #dd6b20;
    margin-top: 0;
    font-size: 1.5rem;
    letter-spacing: normal;
}

.cta-box p {
    font-size: 1rem;
    color: #4a5568;
    max-width: 500px;
    margin: 0.5rem auto 1.5rem auto;
}

/* Action Button */
.btn {
    display: inline-block;
    background-color: #ed8936;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.125rem;
    padding: 1rem 2rem;
    border-radius: 6px;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 4px 6px rgba(237, 137, 54, 0.2);
    margin-bottom: 16px;
}

.btn:hover {
    background-color: #dd6b20;
    transform: translateY(-1px);
    box-shadow: 0 7px 14px rgba(237, 137, 54, 0.3);
}

.btn:active {
    transform: translateY(1px);
}

.separator {
    margin-top: 4px
}

/* Responsive adjustments for phones */
@media (max-width: 640px) {
    main {
        margin: 1.5rem auto;
    }
    h2 {
        font-size: 1.75rem;
    }
    .cta-box {
        padding: 1.5rem;
    }
    .btn {
        width: 100%;
        text-align: center;
    }
    ul li {
        flex-direction: column;
        padding: 0.75rem 0;
    }
}