/* ── Domain Name Guide ───────────────────────────── */

.guide-intro {
    background: linear-gradient(135deg, #f8f9fa 0%, #fff5f0 100%);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.07);
    margin-bottom: 25px;
    border-top: 5px solid #ff6b35;
}

.guide-intro h2 {
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 15px;
}

.guide-intro p {
    font-size: 1.05rem;
    color: #495057;
    line-height: 1.8;
    margin-bottom: 15px;
}

/* Extension grid */
.ext-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.ext-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.08);
    border-top: 4px solid #2c3e50;
    text-align: center;
}

.ext-card.recommended {
    border-top-color: #ff6b35;
}

.ext-label {
    font-size: 1.4rem;
    font-weight: 800;
    color: #2c3e50;
    display: block;
    margin-bottom: 8px;
}

.ext-card.recommended .ext-label {
    color: #ff6b35;
}

.ext-card p {
    font-size: 0.9rem;
    color: #6c757d;
    line-height: 1.6;
    margin: 0;
    text-align: left;
}

.ext-badge {
    display: inline-block;
    background: #ff6b35;
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 8px;
}

.ext-badge-black {
    display: inline-block;
    background: #2c3e50;
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 8px;
}

/* Do / Don't two-column */
.dos-donts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}

.do-col, .dont-col {
    border-radius: 12px;
    padding: 24px;
}

.do-col {
    background: #f0fdf4;
    border-left: 5px solid #27ae60;
}

.dont-col {
    background: #fff9f9;
    border-left: 5px solid #e74c3c;
}

.do-col h3 {
    color: #27ae60;
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dont-col h3 {
    color: #e74c3c;
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.do-col ul, .dont-col ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.do-col ul li, .dont-col ul li {
    font-size: 0.95rem;
    color: #495057;
    line-height: 1.7;
    padding: 4px 0 4px 22px;
    position: relative;
}

.do-col ul li::before {
    content: '✓';
    color: #27ae60;
    font-weight: 700;
    position: absolute;
    left: 0;
}

.dont-col ul li::before {
    content: '✗';
    color: #e74c3c;
    font-weight: 700;
    position: absolute;
    left: 0;
}

@media (max-width: 850px) {
    .dos-donts {
        grid-template-columns: 1fr;
    }

    .ext-grid {
        grid-template-columns: 1fr;
    }
}