* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.navbar {
    background-color: #1677ff;
    color: #ffffff;
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 24px;
    font-weight: bold;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.home-link {
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.home-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.main-content {
    min-height: calc(100vh - 200px);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

.category-section {
    margin-bottom: 30px;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.category-section h2 {
    margin-bottom: 15px;
    font-size: 18px;
    color: #333;
}

.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.category-btn {
    padding: 12px 24px;
    border: 1px solid #d9d9d9;
    background-color: #ffffff;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    flex: 1 1 calc(20% - 10px);
    min-width: 120px;
    text-align: center;
}

.category-btn:hover {
    border-color: #1677ff;
    color: #1677ff;
}

.category-btn.active {
    background-color: #1677ff;
    color: #ffffff;
    border-color: #1677ff;
}

.filter-section {
    margin-bottom: 30px;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.filter-section h2 {
    margin-bottom: 15px;
    font-size: 18px;
    color: #333;
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-item label {
    font-size: 14px;
    color: #666;
    white-space: nowrap;
}

#tail-number {
    padding: 10px 16px;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    font-size: 14px;
    width: 180px;
    transition: border-color 0.3s ease;
}

#tail-number:focus {
    outline: none;
    border-color: #1677ff;
    box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.1);
}

.checkbox-group {
    display: flex;
    gap: 20px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 14px;
}

.filter-btn {
    padding: 10px 24px;
    background-color: #1677ff;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 14px;
    font-weight: 500;
}

.filter-btn:hover {
    background-color: #40a9ff;
}

.result-info {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: #f0f2f5;
    border-radius: 8px;
}

.result-info p {
    font-size: 14px;
    color: #666;
    margin: 0;
}

#category-info {
    font-weight: bold;
    color: #333;
}

#result-count {
    color: #1677ff;
    font-weight: 500;
}

.number-section {
    margin-bottom: 30px;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.number-section h2 {
    margin-bottom: 15px;
    font-size: 18px;
    color: #333;
}

.number-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
}

@media (max-width: 768px) {
    .number-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .number-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1025px) {
    .number-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

.number-card {
    background-color: #ffffff;
    border: 1px solid #d9d9d9;
    border-radius: 8px;
    padding: 20px 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.number-card:hover {
    border-color: #1677ff;
    box-shadow: 0 4px 12px rgba(22, 119, 255, 0.2);
    transform: translateY(-2px);
}

.number-card.selected {
    background-color: #e6f7ff;
    border-color: #1677ff;
}

.number-card .number {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 12px;
    color: #333;
}

.number-card .copy-btn {
    padding: 6px 12px;
    background-color: #f0f0f0;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.number-card .copy-btn:hover {
    background-color: #e0e0e0;
    color: #1677ff;
}

.pagination {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.pagination-btn {
    padding: 8px 16px;
    background-color: #ffffff;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.pagination-btn:hover:not(.disabled) {
    border-color: #1677ff;
    color: #1677ff;
}

.pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-info {
    font-size: 14px;
    color: #666;
}

.footer {
    background-color: #1677ff;
    color: #ffffff;
    padding: 40px 0;
    margin-top: 50px;
}

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

.footer-top {
    margin-bottom: 30px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.contact-btn {
    padding: 12px 24px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    text-decoration: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.contact-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

.contact-phone {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

@media (max-width: 768px) {
    .navbar-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .container {
        padding: 20px 15px;
    }
    
    .logo h1 {
        font-size: 20px;
    }
    
    .category-btn {
        flex: 1 1 calc(50% - 10px);
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .filter-item {
        width: 100%;
    }
    
    #tail-number {
        width: 100%;
    }
    
    .result-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 15px;
    }
    
    .footer-content {
        padding: 0 15px;
    }
    
    .contact-info {
        text-align: center;
    }
}