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

:root {
    --us-primary-blue: #1e3a5f;
    --us-dark-blue: #0f1f33;
    --us-accent-orange: #e67e22;
    --us-light-orange: #f39c12;
    --us-text-dark: #2c3e50;
    --us-text-gray: #5d6d7e;
    --us-bg-light: #f8f9fa;
    --us-white: #ffffff;
    --us-transition: all 0.3s ease;
}

body {
    font-family: "Microsoft YaHei", "Source Han Sans CN", "PingFang SC", sans-serif;
    color: var(--us-text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Banner区域 */
.us-hero-banner {
    height: 500px;
    background: linear-gradient(135deg, var(--us-dark-blue) 0%, var(--us-primary-blue) 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

    .us-hero-banner::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('https://kimi-web-img.moonshot.cn/img/imgs.699pic.com/e9507128135e2d16d3dff893d153214fbd7521f9.v2') center/cover;
        opacity: 0.15;
    }

.us-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--us-white);
    padding: 0 20px;
    animation: us-fadeInUp 1s ease;
}

@keyframes us-fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.us-hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.us-hero-content p {
    font-size: 20px;
    opacity: 0.9;
    font-weight: 300;
}

.us-hero-divider {
    width: 60px;
    height: 3px;
    background: var(--us-accent-orange);
    margin: 20px auto;
}

/* 通用容器 */
.us-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.us-section {
    padding: 80px 0;
}

.us-section-title {
    text-align: center;
    margin-bottom: 60px;
}

    .us-section-title h2 {
        font-size: 36px;
        color: var(--us-primary-blue);
        margin-bottom: 15px;
        font-weight: 600;
    }

    .us-section-title p {
        color: var(--us-text-gray);
        font-size: 16px;
    }

.us-title-line {
    width: 50px;
    height: 3px;
    background: var(--us-accent-orange);
    margin: 15px auto;
}

/* 品牌故事 */
.us-story-section {
    background: var(--us-white);
}

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

.us-story-text h3 {
    font-size: 28px;
    color: var(--us-primary-blue);
    margin-bottom: 20px;
}

.us-story-text p {
    color: var(--us-text-gray);
    margin-bottom: 15px;
    line-height: 1.8;
}

.us-story-timeline {
    position: relative;
    padding-left: 30px;
}

.us-timeline-line {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--us-accent-orange), var(--us-primary-blue));
}

.us-timeline-item {
    position: relative;
    margin-bottom: 30px;
    cursor: pointer;
    transition: var(--us-transition);
    padding: 15px;
    border-radius: 8px;
}

    .us-timeline-item:hover {
        background: var(--us-bg-light);
        transform: translateX(5px);
    }

.us-timeline-dot {
    position: absolute;
    left: -34px;
    top: 20px;
    width: 12px;
    height: 12px;
    background: var(--us-accent-orange);
    border-radius: 50%;
    border: 3px solid var(--us-white);
    box-shadow: 0 0 0 2px var(--us-accent-orange);
}

.us-timeline-year {
    font-size: 14px;
    color: var(--us-accent-orange);
    font-weight: 600;
    margin-bottom: 5px;
}

.us-timeline-content {
    font-size: 16px;
    color: var(--us-text-dark);
    font-weight: 500;
}

.us-timeline-detail {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    font-size: 14px;
    color: var(--us-text-gray);
    margin-top: 10px;
}

.us-timeline-item.us-active .us-timeline-detail {
    max-height: 100px;
}

.us-story-image {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

    .us-story-image img {
        width: 100%;
        height: 400px;
        object-fit: cover;
        transition: var(--us-transition);
    }

    .us-story-image:hover img {
        transform: scale(1.05);
    }

/* 业务介绍 */
.us-services-section {
    background: var(--us-bg-light);
}

.us-services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.us-service-card {
    background: var(--us-white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    transition: var(--us-transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

    .us-service-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: var(--us-accent-orange);
        transform: scaleX(0);
        transition: var(--us-transition);
    }

    .us-service-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }

        .us-service-card:hover::before {
            transform: scaleX(1);
        }

.us-service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--us-primary-blue), var(--us-dark-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--us-white);
    font-size: 28px;
    transition: var(--us-transition);
}

.us-service-card:hover .us-service-icon {
    background: var(--us-accent-orange);
    transform: rotateY(360deg);
}

.us-service-card h3 {
    font-size: 20px;
    color: var(--us-primary-blue);
    margin-bottom: 15px;
}

.us-service-card p {
    color: var(--us-text-gray);
    font-size: 14px;
    line-height: 1.6;
}

/* 核心差异 */
.us-difference-section {
    background: var(--us-white);
}

.us-difference-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.us-diff-card {
    text-align: center;
    padding: 40px;
    border-radius: 12px;
    background: var(--us-bg-light);
    transition: var(--us-transition);
    position: relative;
    overflow: hidden;
}

    .us-diff-card:hover {
        background: var(--us-primary-blue);
        color: var(--us-white);
    }

        .us-diff-card:hover h3,
        .us-diff-card:hover p,
        .us-diff-card:hover .us-diff-stat {
            color: var(--us-white);
        }

.us-diff-icon {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--us-accent-orange);
}

.us-diff-card h3 {
    font-size: 22px;
    color: var(--us-primary-blue);
    margin-bottom: 15px;
    transition: var(--us-transition);
}

.us-diff-stat {
    font-size: 36px;
    font-weight: 700;
    color: var(--us-accent-orange);
    margin: 20px 0;
    font-family: Arial, sans-serif;
    transition: var(--us-transition);
}

.us-diff-card p {
    color: var(--us-text-gray);
    font-size: 15px;
    line-height: 1.6;
    transition: var(--us-transition);
}

/* 服务网络 */
.us-network-section {
    background: linear-gradient(to bottom, var(--us-bg-light), var(--us-white));
}

.us-network-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.us-map-container {
    background: var(--us-white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    min-height: 400px;
    position: relative;
}

.us-map-placeholder {
    width: 100%;
    height: 350px;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.us-map-marker {
    position: absolute;
    cursor: pointer;
    transition: var(--us-transition);
}

    .us-map-marker:hover {
        transform: scale(1.2);
    }

.us-marker-dot {
    width: 20px;
    height: 20px;
    background: var(--us-accent-orange);
    border-radius: 50%;
    box-shadow: 0 0 0 8px rgba(230, 126, 34, 0.3);
    animation: us-pulse 2s infinite;
}

@keyframes us-pulse {
    0%, 100% {
        box-shadow: 0 0 0 8px rgba(230, 126, 34, 0.3);
    }

    50% {
        box-shadow: 0 0 0 15px rgba(230, 126, 34, 0.1);
    }
}

.us-marker-label {
    position: absolute;
    top: 25px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--us-primary-blue);
    color: var(--us-white);
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    transition: var(--us-transition);
}

.us-map-marker:hover .us-marker-label {
    opacity: 1;
}

.us-location-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.us-location-card {
    background: var(--us-white);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border-left: 4px solid var(--us-accent-orange);
    transition: var(--us-transition);
    cursor: pointer;
}

    .us-location-card:hover,
    .us-location-card.us-active {
        transform: translateX(10px);
        box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    }

    .us-location-card h4 {
        color: var(--us-primary-blue);
        font-size: 18px;
        margin-bottom: 8px;
    }

    .us-location-card p {
        color: var(--us-text-gray);
        font-size: 14px;
        line-height: 1.5;
    }

/* 联系信息 */
.us-contact-section {
    background: var(--us-primary-blue);
    color: var(--us-white);
}

    .us-contact-section .us-section-title h2,
    .us-contact-section .us-section-title p {
        color: var(--us-white);
    }

.us-contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.us-contact-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    padding: 35px 25px;
    border-radius: 12px;
    text-align: center;
    transition: var(--us-transition);
    border: 1px solid rgba(255,255,255,0.2);
}

    .us-contact-card:hover {
        background: rgba(255,255,255,0.2);
        transform: translateY(-5px);
    }

.us-contact-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--us-accent-orange);
}

.us-contact-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: 600;
}

.us-contact-card p,
.us-contact-card a {
    color: rgba(255,255,255,0.9);
    font-size: 15px;
    text-decoration: none;
    transition: var(--us-transition);
}

    .us-contact-card a:hover {
        color: var(--us-accent-orange);
    }

.us-work-time {
    margin-top: 10px;
    font-size: 13px;
    opacity: 0.8;
}

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

    .us-difference-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .us-contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .us-network-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .us-hero-content h1 {
        font-size: 32px;
    }

    .us-hero-content p {
        font-size: 16px;
    }

    .us-story-grid {
        grid-template-columns: 1fr;
    }

    .us-services-grid,
    .us-difference-grid,
    .us-contact-grid {
        grid-template-columns: 1fr;
    }

    .us-section-title h2 {
        font-size: 28px;
    }

    .us-section {
        padding: 60px 0;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载优化 */
.us-lazy-load {
    opacity: 0;
    transition: opacity 0.5s ease;
}

    .us-lazy-load.us-loaded {
        opacity: 1;
    }