/* ================================================================
 * about.css - Styles for About Us page
 * ================================================================ */

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

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 主营业务板块 */
.main-business {
    padding: 100px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.section-title {
    text-align: center;
    font-size: 48px;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    margin: 20px auto 0;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.business-card {
    background: #fff;
    border-radius: 20px;
    padding: 50px 40px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-top: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.business-card:hover::before {
    opacity: 1;
}

.business-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.3);
    border-top-color: #667eea;
}

.business-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.business-icon svg {
    width: 40px;
    height: 40px;
    color: #fff;
}

.business-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.business-card p {
    font-size: 14px;
    color: #718096;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

/* 专利证书板块 */
.patents {
    padding: 100px 0;
    background: #fff;
}

.patents-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-top: 60px;
}

.patents-text h3 {
    font-size: 32px;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 20px;
}

.patents-text p {
    font-size: 16px;
    color: #4a5568;
    line-height: 1.8;
    margin-bottom: 30px;
}

.patents-images {
    position: relative;
    height: 500px;
}

.patent-img {
    position: absolute;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: all 0.4s ease;
    cursor: pointer;
}

.patent-img:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.patent-img.main {
    width: 280px;
    height: 380px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
    border: 3px solid #667eea;
}

.patent-img.back {
    width: 240px;
    height: 320px;
    filter: blur(2px);
    opacity: 0.6;
}

.patent-img.back-1 {
    top: 0;
    left: 0;
}

.patent-img.back-2 {
    top: 0;
    right: 0;
}

.patent-img.back-3 {
    bottom: 0;
    left: 0;
}

.patent-img.back-4 {
    bottom: 0;
    right: 0;
}

.product-showcase {
    margin-top: 60px;
    text-align: center;
}

.product-img {
    max-width: 600px;
    margin: 0 auto;
    border-radius: 20px;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
    transition: transform 0.4s ease;
}

.product-img:hover {
    transform: scale(1.02);
}

/* 公司规模板块 */
.company-size {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.company-size .section-title {
    color: #fff;
}

.company-size .section-title::after {
    background: #fff;
}

.team-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.team-img {
    width: 100%;
    height: 400px;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.3);
    transition: transform 0.4s ease;
}

.team-img:hover {
    transform: scale(1.02);
}

.team-text h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 20px;
}

.team-text p {
    font-size: 16px;
    line-height: 1.8;
    opacity: 0.95;
}

.production-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.production-text h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 20px;
}

.production-text p {
    font-size: 16px;
    line-height: 1.8;
    opacity: 0.95;
}

.production-img {
    width: 100%;
    height: 400px;
    border-radius: 20px;
    object-fit: cover;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.3);
    transition: transform 0.4s ease;
}

.production-img:hover {
    transform: scale(1.02);
}

/* 发展历史板块 */
.development-history {
    padding: 100px 0;
    background: #fff;
}

.timeline-container {
    margin-top: 60px;
    position: relative;
}

.timeline-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.timeline-img {
    width: 100%;
    height: 280px;
    border-radius: 16px;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: all 0.4s ease;
    cursor: pointer;
}

.timeline-img:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
}

.timeline {
    position: relative;
    padding: 40px 0;
}

.timeline-line {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: #e2e8f0;
    transform: translateY(-50%);
}

.timeline-points {
    display: flex;
    justify-content: space-between;
    position: relative;
    z-index: 1;
}

.timeline-point {
    text-align: center;
    position: relative;
}

.point-marker {
    width: 20px;
    height: 20px;
    background: #667eea;
    border-radius: 50%;
    margin: 0 auto 15px;
    position: relative;
    top: -9px;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.timeline-point .year {
    font-size: 24px;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 10px;
}

.event-desc {
    font-size: 14px;
    color: #718096;
    line-height: 1.7;
    max-width: 280px;
    margin: 12px auto 0;
    padding: 0 10px;
    text-align: center;
}

/* 企业文化板块 */
.company-culture {
    padding: 100px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.culture-card {
    position: relative;
    height: 400px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 50px 40px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.culture-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
}

.culture-card.mission-card {
    background: linear-gradient(145deg, #1e3c72 0%, #2a5298 100%);
}

.culture-card.vision-card {
    background: linear-gradient(145deg, #4a00e0 0%, #8e2de2 100%);
}

.culture-card.stance-card {
    background: linear-gradient(145deg, #134e5e 0%, #1a7a8a 100%);
}

.culture-icon {
    width: 88px;
    height: 88px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: background 0.3s ease;
}

.culture-card:hover .culture-icon {
    background: rgba(255, 255, 255, 0.25);
}

.culture-icon svg {
    width: 44px;
    height: 44px;
    color: #fff;
    stroke: #fff;
}

.culture-card h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 16px;
    text-transform: uppercase;
    color: #fff;
    letter-spacing: 2px;
}

.culture-card p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.75;
    max-width: 260px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .business-grid,
    .culture-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .business-grid,
    .patents-content,
    .team-section,
    .production-section,
    .timeline-images,
    .culture-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 36px;
    }

    .patents-images {
        height: 400px;
    }
}