/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: "Microsoft YaHei", "微软雅黑", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: #2c3e50;
    background-color: #f5f7fa;
    line-height: 1.7;
    font-size: 15px;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ========== 通用容器 ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 顶部导航 ========== */
.site-header {
    background: #1f3a5f;
    color: #ffffff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 4px;
    flex-shrink: 0;
}

.brand-name {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    color: #d6deea;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
    background-color: #2b4d7a;
    color: #ffffff;
}

/* ========== 通用 section ========== */
.section {
    padding: 64px 0;
}

.section-title {
    font-size: 28px;
    color: #1f3a5f;
    text-align: center;
    margin-bottom: 16px;
    font-weight: 600;
}

.section-title::after {
    content: "";
    display: block;
    width: 48px;
    height: 3px;
    background: #4a7bb7;
    margin: 12px auto 0;
}

.section-intro {
    text-align: center;
    color: #6b7a8c;
    margin-bottom: 36px;
    font-size: 14px;
}

/* ========== 首页 hero ========== */
.hero {
    background: linear-gradient(180deg, #2b4d7a 0%, #1f3a5f 100%);
    color: #ffffff;
    text-align: center;
    padding: 80px 0 64px;
}

.hero-title {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 18px;
    color: #c9d6e8;
    margin-bottom: 48px;
}

.hero-business {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: left;
}

.biz-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    padding: 24px 20px;
}

.biz-card-title {
    font-size: 16px;
    color: #ffffff;
    margin-bottom: 10px;
    font-weight: 600;
}

.biz-card-desc {
    font-size: 13px;
    color: #b5c5db;
    line-height: 1.6;
}

/* ========== 关于我们 ========== */
.about {
    background: #ffffff;
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    margin-bottom: 36px;
}

.about-text p {
    margin-bottom: 18px;
    color: #3d4f63;
    text-indent: 2em;
    font-size: 15px;
}

.about-info {
    background: #f5f7fa;
    border-radius: 6px;
    padding: 20px;
    border: 1px solid #e3e9f0;
}

.info-table {
    width: 100%;
    border-collapse: collapse;
}

.info-table th,
.info-table td {
    padding: 12px 10px;
    text-align: left;
    font-size: 14px;
    border-bottom: 1px solid #e3e9f0;
    vertical-align: top;
}

.info-table th {
    color: #6b7a8c;
    font-weight: 500;
    width: 38%;
}

.info-table td {
    color: #2c3e50;
    font-weight: 500;
}

.info-table tr:last-child th,
.info-table tr:last-child td {
    border-bottom: none;
}

.compliance-statement {
    background: #eef3f9;
    border-left: 4px solid #4a7bb7;
    padding: 20px 24px;
    border-radius: 4px;
}

.statement-title {
    color: #1f3a5f;
    font-size: 17px;
    margin-bottom: 10px;
    font-weight: 600;
}

.compliance-statement p {
    color: #3d4f63;
    font-size: 14px;
}

/* ========== 业务范围 ========== */
.business {
    background: #f5f7fa;
}

.business-list {
    counter-reset: biz;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.business-item {
    display: flex;
    align-items: center;
    background: #ffffff;
    border: 1px solid #e3e9f0;
    border-radius: 6px;
    padding: 20px 24px;
    transition: border-color 0.2s;
}

.business-item:hover {
    border-color: #4a7bb7;
}

.business-index {
    font-size: 28px;
    font-weight: 700;
    color: #4a7bb7;
    margin-right: 24px;
    min-width: 50px;
    font-family: "Georgia", "Times New Roman", serif;
}

.business-text h3 {
    font-size: 17px;
    color: #1f3a5f;
    margin-bottom: 6px;
    font-weight: 600;
}

.business-text p {
    font-size: 14px;
    color: #6b7a8c;
}

/* ========== 联系我们 ========== */
.contact {
    background: #ffffff;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    background: #f5f7fa;
    border: 1px solid #e3e9f0;
    border-radius: 6px;
    padding: 24px;
}

.contact-label {
    font-size: 13px;
    color: #6b7a8c;
    margin-bottom: 8px;
    font-weight: 500;
}

.contact-value {
    font-size: 16px;
    color: #1f3a5f;
    font-weight: 500;
    word-break: break-all;
}

/* ========== 页脚 ========== */
.site-footer {
    background: #1f3a5f;
    color: #c9d6e8;
    padding: 40px 0 24px;
    font-size: 13px;
}

.footer-info p {
    margin-bottom: 6px;
    line-height: 1.8;
}

.footer-copyright {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: #8fa3bd;
    font-size: 12px;
}

/* ========== 响应式适配 PC 中等分辨率 ========== */
@media (max-width: 992px) {
    .hero-title {
        font-size: 30px;
    }
    .hero-business {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .header-inner {
        height: auto;
        padding: 12px 24px;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .main-nav {
        flex-wrap: wrap;
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 48px 0 40px;
    }
    .hero-title {
        font-size: 24px;
    }
    .hero-subtitle {
        font-size: 15px;
        margin-bottom: 28px;
    }
    .hero-business {
        grid-template-columns: 1fr;
    }
    .section {
        padding: 40px 0;
    }
    .section-title {
        font-size: 22px;
    }
    .business-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .business-index {
        margin-right: 0;
        font-size: 22px;
    }
}