/* ===== 全局重置 & 变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-dark: #0A2540;
    --primary-blue: #0055FF;
    --primary-blue-hover: #0040cc;
    --white: #ffffff;
    --light-gray: #F4F7FA;
    --medium-gray: #e6edf4;
    --text-dark: #0A2540;
    --text-body: #2c3e50;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --radius: 12px;
    --transition: all 0.25s ease;
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--white);
    color: var(--text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn-primary {
    display: inline-block;
    background: var(--primary-blue);
    color: var(--white);
    font-weight: 600;
    padding: 10px 28px;
    border-radius: 40px;
    border: none;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 10px rgba(0, 85, 255, 0.2);
}

.btn-primary:hover {
    background: var(--primary-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 85, 255, 0.3);
}

.btn-outline {
    display: inline-block;
    background: transparent;
    color: var(--white);
    font-weight: 600;
    padding: 10px 28px;
    border-radius: 40px;
    border: 1.5px solid var(--white);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-dark);
}

.btn-outline-dark {
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}

.btn-outline-dark:hover {
    background: var(--primary-dark);
    color: var(--white);
}

/* ===== 头部 / 导航 ===== */
.navbar {
    background: var(--white);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: blur(4px);
    background: rgba(255, 255, 255, 0.92);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

/* ---- LOGO ---- */
.logo {
    display: flex;
    align-items: baseline;
    gap: 4px;
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--primary-dark);
    letter-spacing: 0.5px;
}

.logo .brand-name {
    font-weight: 700;
    color: var(--primary-dark);
}

.logo .brand-name i {
    color: var(--primary-blue);
    font-size: 1.6rem;
    margin-right: 6px;
}

.logo .brand-sub {
    font-weight: 300;
    font-size: 0.85rem;
    color: var(--primary-blue);
    letter-spacing: 2px;
    margin-left: 6px;
    padding-left: 8px;
    border-left: 1.5px solid var(--medium-gray);
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.15rem;
        flex-wrap: wrap;
    }
    .logo .brand-sub {
        font-size: 0.7rem;
        border-left: none;
        padding-left: 0;
        margin-left: 0;
        width: 100%;
    }
}

/* ---- 导航菜单 ---- */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-menu a {
    color: var(--text-dark);
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-blue);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    opacity: 1;
}

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

.nav-cta {
    margin-left: 4px;
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--primary-dark);
}

@media (max-width: 920px) {
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        padding: 20px 0 12px;
        border-top: 1px solid var(--medium-gray);
        margin-top: 12px;
    }
    .nav-menu.open {
        display: flex;
    }
    .hamburger {
        display: block;
    }
    .nav-cta {
        margin-left: 0;
    }
    .nav-cta .btn-primary {
        /* 移动端按钮宽度自适应文字，不撑满屏幕 */
        display: inline-block;
        width: auto;
    }
}

/* ===== 通用 section 标题 ===== */
.section-title {
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--primary-dark);
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}

.section-sub {
    color: #5a6f8c;
    font-size: 1.05rem;
    max-width: 640px;
}

.section-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 48px;
}

/* ===== Hero 区 ===== */
.hero {
    background: linear-gradient(135deg, #0A1E33 0%, #1A365D 100%);
    color: var(--white);
    padding: 60px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    right: -10%;
    top: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 85, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-content h1 .highlight {
    color: #7ab7ff;
}

.hero-content p {
    font-size: 1.1rem;
    opacity: 0.85;
    max-width: 480px;
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 40px;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(4px);
    border-radius: var(--radius);
    padding: 20px 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-stats .stat-item {
    text-align: center;
}

.hero-stats .stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    display: block;
    color: #fff;
}

.hero-stats .stat-label {
    font-size: 0.9rem;
    opacity: 0.7;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual i {
    font-size: 12rem;
    color: rgba(255, 255, 255, 0.1);
}

.hero-grid-icon {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    width: 100%;
}

.hero-grid-icon .icon-box {
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
    padding: 24px 12px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
}

.hero-grid-icon .icon-box i {
    font-size: 2.2rem;
    color: #7ab7ff;
    margin-bottom: 10px;
}

.hero-grid-icon .icon-box span {
    display: block;
    font-size: 0.9rem;
    opacity: 0.85;
}

@media (max-width: 820px) {
    .hero .container {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 2.4rem;
    }
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===== 业务概览 (首页卡片) ===== */
.section-services {
    padding: 72px 0 80px;
    background: var(--light-gray);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 24px;
    margin-top: 12px;
}

.service-card {
    background: var(--light-gray);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
    cursor: default;
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
    background: var(--white);
}

.service-card i {
    font-size: 2.4rem;
    color: var(--primary-blue);
    margin-bottom: 12px;
}

.service-card h4 {
    font-weight: 600;
    color: var(--primary-dark);
    font-size: 1rem;
}

/* ===== 关于预览 (首页) ===== */
.section-about-preview {
    background: var(--white);
    padding: 72px 0 80px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    color: var(--primary-dark);
    margin-bottom: 16px;
}

.about-text p {
    margin-bottom: 20px;
    color: #3d5775;
}

.about-image {
    background: var(--medium-gray);
    border-radius: var(--radius);
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #7a8aa0;
    font-size: 1rem;
    border: 1px dashed #bcc9db;
}

.about-image i {
    font-size: 3rem;
    margin-right: 12px;
    color: var(--primary-blue);
}

@media (max-width: 760px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 最新动态 (首页) ===== */
.section-news {
    padding: 72px 0 80px;
    background: var(--white);
}

.news-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.news-item {
    border-bottom: 1px solid var(--medium-gray);
    padding-bottom: 16px;
    transition: var(--transition);
}

.news-item:hover {
    border-bottom-color: var(--primary-blue);
}

.news-item .tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-blue);
    background: #e2ecff;
    padding: 2px 12px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 8px;
}

.news-item h4 {
    color: var(--primary-dark);
    font-weight: 600;
    margin-bottom: 4px;
}

.news-item .date {
    font-size: 0.85rem;
    color: #7a8aa0;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.6fr;
    gap: 24px;
    margin-bottom: 40px;
}

/* 浏览器宽度够大：公司媒体与前面4列同行 */
.footer-media-cell {
    min-width: 0;
}

.footer-brand p {
    max-width: 260px;
    margin-top: 12px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 浏览器宽度不够 → 公司媒体占据整行，换到下一行 */
@media (max-width: 1150px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
    .footer-media-cell {
        grid-column: 1 / -1;
    }
}

.footer-brand .logo {
    color: var(--white);
    font-size: 1.4rem;
}

/* 页脚深色背景下的品牌名需要白色 */
.footer-brand .logo .brand-name {
    color: var(--white);
}

.footer-brand .logo .brand-name i {
    color: #7ab7ff;
}

.footer-brand .logo .brand-sub {
    border-left-color: rgba(255, 255, 255, 0.2);
    color: #7ab7ff;
}

.footer h5 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer ul li {
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.footer ul li a:hover {
    color: var(--white);
}

@media (max-width: 800px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 500px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 内部页面通用 ===== */
.page-placeholder {
    padding: 40px 0 80px;
    background: var(--white);
}

.page-placeholder .container {
    max-width: 1200px;
}

.page-placeholder h1 {
    font-size: 2.6rem;
    color: var(--primary-dark);
    margin-bottom: 16px;
}

.page-placeholder p {
    font-size: 1.1rem;
    color: #3d5775;
    margin-bottom: 24px;
}

.placeholder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin: 32px 0;
}

.placeholder-card {
    background: var(--light-gray);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
}

.placeholder-card i {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.placeholder-card h4 {
    color: var(--primary-dark);
}

/* ===== 联系我们首页区块 ===== */
.section-contact {
    padding: 72px 0 80px;
    background: var(--light-gray);
}

/* 联系我们保持和其他模块一致的宽度 */
.section-contact .container {
    max-width: 1200px;
}

/* ===== 联系方式网格 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 40px;
    margin-top: 24px;
}

@media (max-width: 700px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 在线留言表单 ===== */
.contact-form {
    background: var(--light-gray);
    padding: 36px 40px;
    border-radius: var(--radius);
    margin-top: 28px;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d5dee8;
    border-radius: 8px;
    font-family: inherit;
    background: var(--white);
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 85, 255, 0.1);
}

.contact-form .full-width {
    grid-column: 1 / -1;
}

.contact-form .btn-primary {
    margin-top: 8px;
}

/* 必填项红色星号 */
.form-field.required {
    position: relative;
}

.form-field.required input::placeholder {
    /* placeholder 末尾已有标记无需额外星号 */
}

.form-field.required::after {
    content: '*';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #e74c3c;
    font-weight: 700;
    font-size: 1rem;
    pointer-events: none;
}

@media (max-width: 600px) {
    .contact-form .form-row {
        grid-template-columns: 1fr;
    }
}

/* ===== 首页右侧锚点导航线 ===== */
.section-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 800;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.nav-dot {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    position: relative;
    padding: 8px;
    margin: -8px;
}

.nav-dot span {
    display: block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(0, 85, 255, 0.25);
    transition: var(--transition);
    flex-shrink: 0;
}

.nav-dot:hover span,
.nav-dot.active span {
    background: var(--primary-blue);
    box-shadow: 0 0 8px rgba(0, 85, 255, 0.5);
    transform: scale(1.3);
}

.nav-dot::after {
    content: attr(data-label);
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    font-size: 0.9rem;
    color: var(--text-dark);
    background: rgba(255, 255, 255, 0.94);
    padding: 4px 14px;
    border-radius: 6px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.nav-dot:hover::after,
.nav-dot.active::after {
    opacity: 1;
}

@media (max-width: 768px) {
    .section-nav {
        display: none;
    }
}

/* ===== 公司媒体二维码 ===== */
.media-qrcodes {
    display: flex;
    flex-wrap: nowrap;
    gap: 16px;
    justify-content: center;
    margin-top: 4px;
}

.media-item {
    text-align: center;
    flex-shrink: 0;
}

.media-item img {
    width: 100px;
    height: 100px;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    object-fit: cover;
    margin-bottom: 6px;
}

.media-item span {
    display: block;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
}

/* 屏幕极窄时二维码纵向排列 */
@media (max-width: 450px) {
    .media-qrcodes {
        flex-wrap: wrap;
    }
}

/* ===== 页脚备案 ===== */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    flex-wrap: wrap;
    text-align: center;
}

.footer-beian {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px 16px;
}

.beian-links {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.beian-links a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    transition: var(--transition);
}

.beian-links a:hover {
    color: var(--white);
}

.beian-links i {
    margin-right: 2px;
}

.beian-sep {
    color: rgba(255, 255, 255, 0.2);
}

.footer-social {
    display: flex;
    justify-content: center;
}

.footer-social a {
    margin: 0 8px;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--white);
}

@media (min-width: 600px) {
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* ===== 工具类 ===== */
.mt-16 {
    margin-top: 16px;
}

.text-center {
    text-align: center;
}

.gap-8 {
    gap: 8px;
}

.flex-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.mb-12 {
    margin-bottom: 12px;
}