.p0731-body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; margin: 0; padding: 0; background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%); color: #333; line-height: 1.6; }
.p0731-container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.p0731-header { background: linear-gradient(to right, #003366 0%, #0066cc 100%); color: white; padding: 25px 0; text-align: center; border-bottom: 5px solid #ffcc00; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); }
.p0731-main-title { font-size: 2.5rem; margin: 0; text-transform: uppercase; letter-spacing: 1px; text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3); }
.p0731-subtitle { font-size: 1.3rem; margin-top: 10px; font-weight: 300; max-width: 800px; margin-left: auto; margin-right: auto; }
.p0731-content-section { background: white; border-radius: 10px; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); padding: 30px; margin: 30px 0; overflow: hidden; }
.p0731-section-title { color: #003366; border-left: 5px solid #ffcc00; padding-left: 15px; margin-top: 0; font-size: 1.8rem; }
.p0731-error-explanation { background: #e6f7ff; border-left: 4px solid #0066cc; padding: 20px; margin: 25px 0; border-radius: 0 8px 8px 0; }
.p0731-image-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin: 30px 0; }
.p0731-image-card { border-radius: 8px; overflow: hidden; box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); transition: transform 0.3s ease; }
.p0731-image-card:hover { transform: translateY(-5px); }
.p0731-image-card img { width: 100%; height: auto; display: block; }
.p0731-image-caption { background: #003366; color: white; padding: 12px; text-align: center; font-size: 0.9rem; }
.p0731-problem-causes { background: #fff8e6; border: 1px solid #ffcc00; border-radius: 8px; padding: 20px; margin: 25px 0; }
.p0731-solution-steps { background: #e6ffe6; border: 1px solid #4CAF50; border-radius: 8px; padding: 20px; margin: 25px 0; }
.p0731-symptom-list, .p0731-cause-list, .p0731-step-list { padding-left: 20px; }
.p0731-symptom-list li, .p0731-cause-list li, .p0731-step-list li { margin-bottom: 10px; position: relative; padding-left: 25px; }
.p0731-warning { background: #ffebee; border-left: 4px solid #f44336; padding: 15px; margin: 20px 0; border-radius: 0 8px 8px 0; }
.p0731-note { background: #fffde7; border-left: 4px solid #ffcc00; padding: 15px; margin: 20px 0; border-radius: 0 8px 8px 0; }
.p0731-rtb-container { background: #f5f5f5; border-radius: 8px; padding: 20px; margin: 25px 0; text-align: center; }
.p0731-cost-table { width: 100%; border-collapse: collapse; margin: 25px 0; }
.p0731-cost-table th, .p0731-cost-table td { border: 1px solid #ddd; padding: 12px; text-align: left; }
.p0731-cost-table th { background-color: #003366; color: white; }
.p0731-cost-table tr:nth-child(even) { background-color: #f2f2f2; }
.p0731-cost-table tr:hover { background-color: #e6f2ff; }
.p0731-footer { background: #003366; color: white; text-align: center; padding: 30px 0; margin-top: 40px; }
.p0731-footer-content { max-width: 800px; margin: 0 auto; }
.p0731-contact-info { display: flex; justify-content: center; gap: 30px; margin-top: 20px; }
.p0731-contact-item { display: flex; align-items: center; gap: 10px; }