/* 
 * 文件名: extended.css
 * 描述: 扩展样式表，支持时间轴、表单、证书卡片等元素
 */

/* ====================================
 * 1. 时间轴 (Timeline)
 * ==================================== */
.timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-primary);
    transform: translateX(-50%);
}

.timeline-item {
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-year {
    text-align: right;
    padding-right: var(--spacing-lg);
    width: 45%;
}

.timeline-item:nth-child(even) .timeline-year {
    text-align: left;
    padding-left: var(--spacing-lg);
    width: 45%;
    margin-left: 55%;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: 55%;
    padding-left: var(--spacing-lg);
}

.timeline-item:nth-child(even) .timeline-content {
    margin-right: 55%;
    padding-right: var(--spacing-lg);
    text-align: right;
}

.timeline-year {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--color-primary);
}

.timeline-content {
    background-color: var(--color-light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow-sm);
}

.timeline-content h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-content p {
    margin: 0;
    color: #666;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item:nth-child(odd) .timeline-year,
    .timeline-item:nth-child(even) .timeline-year {
        width: 100%;
        text-align: left;
        padding-left: 60px;
        margin-left: 0;
    }
    
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
        padding-left: 60px;
        text-align: left;
    }
}

/* ====================================
 * 2. 价值观卡片 (Value Cards)
 * ==================================== */
.value-card {
    background-color: var(--color-light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    border-top: 4px solid var(--color-primary);
    transition: all 0.3s ease;
}

.value-card:hover {
    background-color: var(--color-background);
    box-shadow: var(--box-shadow-md);
    transform: translateY(-5px);
}

.value-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.value-card p {
    color: #666;
    margin: 0;
}

/* ====================================
 * 3. 认证卡片 (Certificate Cards)
 * ==================================== */
.cert-card {
    background: linear-gradient(135deg, rgba(0, 86, 179, 0.1) 0%, rgba(40, 167, 69, 0.1) 100%);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--color-primary);
    transition: all 0.3s ease;
}

.cert-card:hover {
    background: linear-gradient(135deg, rgba(0, 86, 179, 0.15) 0%, rgba(40, 167, 69, 0.15) 100%);
    box-shadow: var(--box-shadow-md);
    transform: translateX(5px);
}

.cert-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.cert-card p {
    margin-bottom: var(--spacing-sm);
    color: #666;
}

.cert-card p:last-child {
    margin: 0;
}

/* ====================================
 * 4. 证书图片 (Certificate Images)
 * ==================================== */
.cert-image {
    background-color: var(--color-light-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    text-align: center;
    transition: all 0.3s ease;
}

.cert-image:hover {
    box-shadow: var(--box-shadow-md);
    transform: scale(1.05);
}

.cert-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
}

.cert-image p {
    color: #666;
    font-size: 0.9rem;
    margin: 0;
}

/* ====================================
 * 5. 表单样式 (Form Styles)
 * ==================================== */
.contact-form {
    background-color: var(--color-light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: bold;
    color: var(--color-text-dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid #ddd;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family-base);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn {
    width: 100%;
}

/* ====================================
 * 6. 产品分类卡片 (Product Category)
 * ==================================== */
.product-category {
    background-color: var(--color-light-gray);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    transition: all 0.3s ease;
}

.product-category:hover {
    background-color: var(--color-background);
    box-shadow: var(--box-shadow-md);
    transform: translateY(-5px);
}

.product-category h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.product-category p {
    color: #666;
    margin-bottom: var(--spacing-md);
}

.product-category .btn {
    display: inline-block;
}

/* ====================================
 * 7. 响应式调整 (Responsive)
 * ==================================== */
@media (max-width: 768px) {
    .contact-form {
        padding: var(--spacing-md);
    }
    
    .form-group {
        margin-bottom: var(--spacing-md);
    }
}