/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --light-blue: #60a5fa;
    --dark-blue: #1e40af;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f3f4f6;
    --white: #ffffff;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h1 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--secondary-blue);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-blue);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    transition: all 0.3s ease;
}

/* 首页横幅 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    background-image: 
        url('/static/background.png'),
        linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    background-size: cover, cover;
    background-position: center, center;
    background-repeat: no-repeat, no-repeat;
    background-attachment: fixed, fixed;
    color: var(--white);
    text-align: center;
    margin-top: 70px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.85) 0%, rgba(59, 130, 246, 0.75) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--white);
    color: var(--primary-blue);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* 章节样式 */
.section {
    padding: 80px 0;
}

.section-blue {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
}

.section-light {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-blue);
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--secondary-blue);
    border-radius: 2px;
}

.section-title-white {
    color: var(--white);
}

.section-title-white::after {
    background: var(--white);
}

/* 关于我们 */
.about-content {
    max-width: 900px;
    margin: 0 auto 4rem;
    text-align: center;
}

.about-text p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-light);
}

.philosophy-section {
    margin: 4rem 0;
}

.philosophy-title {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-dark);
    font-weight: 600;
    position: relative;
    padding-bottom: 0.5rem;
}


/* 服务理念 */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.philosophy-card {
    background: linear-gradient(135deg, var(--secondary-blue) 0%, var(--light-blue) 100%);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2);
}

.philosophy-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.4);
}

.philosophy-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.philosophy-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.philosophy-card p {
    font-size: 1.1rem;
    color: var(--white);
    opacity: 0.95;
}


/* 主要业务 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.service-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border-top: 4px solid var(--secondary-blue);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
    border-top-color: var(--primary-blue);
}

.service-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.service-card h3 {
    font-size: 1.3rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.service-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 平台资质 */
.platform-content {
    max-width: 1000px;
    margin: 0 auto;
}

.platform-info h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--white);
}

.certificate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.certificate-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.certificate-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--white);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 0.5rem;
}

.certificate-card ul {
    list-style: none;
}

.certificate-card li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.95);
}

.certificate-card strong {
    color: var(--white);
    font-weight: 600;
}

/* 证书图片 */
.certificate-image {
    margin-top: 3rem;
    text-align: center;
}

.report-image {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.report-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

/* 时间线 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--secondary-blue);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-date {
    flex: 0 0 160px;
    background: var(--secondary-blue);
    color: var(--white);
    padding: 1rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline-content {
    flex: 1;
    background: var(--white);
    padding: 1rem 2em;
    border-radius: 10px;
    margin: 0 2rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.timeline-item:nth-child(even) .timeline-content {
    border-left: none;
}

.timeline-content h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.timeline-content p {
    color: var(--text-light);
}

.status-box {
    max-width: 800px;
    margin: 3rem auto 0;
    background: linear-gradient(135deg, var(--secondary-blue) 0%, var(--light-blue) 100%);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    color: var(--white);
    font-size: 1.2rem;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

/* 联系我们 */
.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-info h3 {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.contact-info > p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.contact-details {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.contact-details p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    text-align: left;
}

/* 页脚 */
.footer {
    background: var(--primary-blue);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .timeline::before {
        left: 30px;
    }

    .timeline-item {
        flex-direction: row !important;
        padding-left: 60px;
    }

    .timeline-date {
        position: absolute;
        left: 0;
        width: 60px;
        flex: none;
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    .timeline-content {
        margin: 0;
        border-left: 4px solid var(--secondary-blue) !important;
        border-right: none !important;
    }

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

    .philosophy-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.8rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .philosophy-card {
        padding: 1.2rem 0.8rem;
        min-width: 0;
    }

    .philosophy-icon {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }

    .philosophy-card h3 {
        font-size: 1.1rem;
        margin-bottom: 0.5rem;
    }

    .philosophy-card p {
        font-size: 0.9rem;
    }

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

@media (max-width: 480px) {
    .hero {
        min-height: 500px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .section {
        padding: 50px 0;
    }

    .philosophy-grid {
        gap: 0.5rem;
    }

    .philosophy-card {
        padding: 1rem 0.5rem;
    }

    .philosophy-icon {
        font-size: 1.8rem;
    }

    .philosophy-card h3 {
        font-size: 1rem;
    }

    .philosophy-card p {
        font-size: 0.85rem;
    }
}