/* ==================== 关于我们页面样式 ==================== */

/* 视频展示区域样式 */
.video-section {
    margin: 40px 0;
    text-align: center;
}

.video-header {
    margin-bottom: 30px;
}

.video-title {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
    position: relative;
}

.video-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #007bff, #0056b3);
    margin: 15px auto 0;
    border-radius: 2px;
}

.video-subtitle {
    font-size: 16px;
    color: #666;
    margin-top: 10px;
}

.video-container {
    max-width: 800px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    /* 16:9 aspect ratio */
    background: #000;
    cursor: pointer;
}

.video-cover {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.brand-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.video-wrapper:hover .play-overlay {
    opacity: 0.9;
}

.play-button {
    transition: transform 0.2s ease;
}

.play-button:hover {
    transform: scale(1.1);
}

.video-wrapper.playing .video-cover,
.video-wrapper.playing .play-overlay {
    opacity: 0;
    pointer-events: none;
}

.video-wrapper.playing .brand-video {
    display: block;
}

/* 优势框样式 */
.advantages-section {
    margin: 50px 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.advantage-box {
    background-color: #262947;
    color: white;
    padding: 30px 20px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.advantage-box img {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
    object-fit: contain;
}

.advantage-box h5 {
    font-size: 18px;
    font-weight: bold;
    margin: 15px 0;
    color: white;
}

.advantage-box p {
    font-size: 14px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* 科技产品网格样式 */
.tech-product-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin: 40px 0;
}

.tech-product-content h3 {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin-bottom: 20px;
}

.tech-product-content p {
    font-size: 16px;
    line-height: 1.8;
    color: #666;
}

.tech-product-image {
    text-align: center;
}

.tech-product-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* 公司介绍网格样式 */
.company-intro-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: start;
    margin: 40px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 40px;
    border-radius: 12px;
    border-left: 4px solid #007bff;
}

.company-title h3 {
    font-size: 24px;
    font-weight: bold;
    color: #262947;
    margin: 0;
    padding-right: 20px;
    border-right: 2px solid #dee2e6;
    text-align: right;
}

.company-description p {
    font-size: 16px;
    line-height: 1.8;
    color: #495057;
    margin: 0;
    text-align: justify;
}

/* 赞助网格样式 */
.sponsorship-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin: 40px 0;
}

.sponsorship-column {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.sponsorship-column:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.sponsorship-image {
    margin-bottom: 20px;
}

.sponsorship-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
}

.sponsorship-column h5 {
    font-size: 18px;
    font-weight: bold;
    color: #262947;
    margin: 15px 0;
    line-height: 1.4;
}

.sponsorship-column p {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .sponsorship-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .video-title {
        font-size: 24px;
    }

    .video-container {
        margin: 0 15px;
        border-radius: 8px;
    }

    .play-button svg {
        width: 50px;
        height: 50px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .tech-product-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .tech-product-content {
        order: 2;
    }

    .tech-product-image {
        order: 1;
    }

    .tech-product-content h3 {
        font-size: 24px;
        text-align: center;
    }

    .tech-product-content p {
        text-align: center;
    }

    .company-intro-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 30px 20px;
    }

    .company-title h3 {
        text-align: center;
        border-right: none;
        border-bottom: 2px solid #dee2e6;
        padding-right: 0;
        padding-bottom: 15px;
        margin-bottom: 20px;
    }

    .company-description p {
        text-align: left;
    }

    .sponsorship-grid {
        grid-template-columns: 1fr;
    }

    .sponsorship-column {
        padding: 20px;
    }

    .sponsorship-image img {
        height: 180px;
    }

    .sponsorship-column h5 {
        font-size: 16px;
    }

    .sponsorship-column p {
        font-size: 13px;
    }
}