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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 1rem;
    line-height: 1.2;
}

h2 {
    font-size: 1.875rem;
    font-weight: 600;
    color: #2d3748;
    margin: 2.5rem 0 1.5rem 0;
    border-bottom: 3px solid #3182ce;
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin: 2rem 0 1rem 0;
}

p {
    margin-bottom: 1.25rem;
    font-size: 1.1rem;
    line-height: 1.7;
    color: #4a5568;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

header h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    opacity: 0.9;
    margin-bottom: 0;
}

/* Main Content */
main {
    background: white;
    margin-top: -20px;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
}

article {
    padding: 3rem 0;
}

section {
    margin-bottom: 3rem;
}

/* Introduction Section */
.introduction {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    padding: 2.5rem;
    border-radius: 15px;
    margin-bottom: 3rem;
    border-left: 5px solid #3182ce;
}

/* Keyword Link Styling */
.keyword-link {
    color: #3182ce;
    text-decoration: none;
    font-weight: 600;
    padding: 2px 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
    background: rgba(49, 130, 206, 0.1);
}

.keyword-link:hover {
    background: rgba(49, 130, 206, 0.2);
    text-decoration: underline;
}

/* Manufacturer Cards */
.manufacturer-card {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.manufacturer-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.manufacturer-card h3 {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.rank {
    background: linear-gradient(135deg, #3182ce 0%, #2c5282 100%);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 50%;
    font-weight: 700;
    margin-right: 1rem;
    min-width: 50px;
    text-align: center;
    font-size: 1.1rem;
}

.rank-1 {
    border: 3px solid #f6ad55;
    background: linear-gradient(135deg, #fff7ed 0%, #fef5e7 100%);
}

.rank-1 .rank {
    background: linear-gradient(135deg, #f6ad55 0%, #ed8936 100%);
    font-size: 1.2rem;
    min-width: 55px;
    padding: 0.6rem 0.8rem;
}

.rank-1 h3 {
    color: #c05621;
}

/* Contact Information */
.contact-info {
    background: #f7fafc;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid #3182ce;
}

.contact-info p {
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.contact-info strong {
    color: #2d3748;
    font-weight: 600;
}

/* Services Section */
.services {
    margin-top: 1rem;
}

.services p {
    text-align: justify;
}

/* FAQ Section */
.faq-item {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid #28a745;
}

.faq-item h3 {
    color: #2c5282;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.faq-item p {
    margin-bottom: 0;
    color: #4a5568;
}

/* Process Steps */
.manufacturing-process h3,
.pcb-types h3,
.quality-control h3,
.innovations-trends h3,
.choosing-manufacturer h3 {
    color: #2c5282;
    border-left: 4px solid #3182ce;
    padding-left: 1rem;
    background: #f7fafc;
    padding: 0.75rem 0 0.75rem 1rem;
    border-radius: 0 8px 8px 0;
}

/* Footer */
footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

footer p {
    margin: 0;
    color: #a0aec0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.25rem;
    }
    
    .manufacturer-card {
        padding: 1.5rem;
    }
    
    .manufacturer-card h3 {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .rank {
        align-self: flex-start;
        margin-right: 0;
        margin-bottom: 0.5rem;
    }
    
    .contact-info {
        padding: 1rem;
    }
    
    .introduction {
        padding: 1.5rem;
    }
    
    article {
        padding: 2rem 0;
    }
}

@media (max-width: 480px) {
    header {
        padding: 2rem 0;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .manufacturer-card {
        padding: 1rem;
    }
    
    .contact-info {
        padding: 1rem;
        font-size: 0.9rem;
    }
    
    .faq-item {
        padding: 1rem;
    }
}

/* Print Styles */
@media print {
    header {
        background: none;
        color: #333;
    }
    
    .manufacturer-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .keyword-link {
        color: #333;
        text-decoration: underline;
    }
}