/* ============================================
   中云盈科 - 官网样式表
   风格参考：阿里云 / 华为云
   主色：#1A6DFF (科技蓝)
   ============================================ */

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

:root {
    --primary: #1A6DFF;
    --primary-dark: #0A4FCC;
    --primary-light: #4A8DFF;
    --primary-gradient: linear-gradient(135deg, #1A6DFF 0%, #0A4FCC 100%);
    --primary-soft: #EEF4FF;
    --accent: #00C9A7;
    --accent-gradient: linear-gradient(135deg, #00C9A7 0%, #00B4D8 100%);
    --dark: #0A1628;
    --dark-secondary: #1A2A4A;
    --text: #2D3748;
    --text-secondary: #6B7A99;
    --text-light: #A0B0CC;
    --bg: #FFFFFF;
    --bg-secondary: #F7F9FC;
    --bg-gradient: linear-gradient(180deg, #F7F9FC 0%, #FFFFFF 100%);
    --border: #E2E8F0;
    --shadow-sm: 0 2px 8px rgba(26, 109, 255, 0.08);
    --shadow-md: 0 8px 30px rgba(26, 109, 255, 0.12);
    --shadow-lg: 0 20px 60px rgba(26, 109, 255, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    color: var(--text);
    line-height: 1.7;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul { list-style: none; }

img { max-width: 100%; height: auto; }

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

/* ---------- 通用组件 ---------- */

.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-tag {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 18px;
    border-radius: 20px;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.section-more {
    text-align: center;
    margin-top: 48px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 8px 25px rgba(26, 109, 255, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(26, 109, 255, 0.45);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ---------- 动画辅助 ---------- */
.animate-up,
.animate-left,
.animate-right {
    opacity: 0;
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-up {
    transform: translateY(40px);
}
.animate-left {
    transform: translateX(-40px);
}
.animate-right {
    transform: translateX(40px);
}

.animate-up.visible,
.animate-left.visible,
.animate-right.visible {
    opacity: 1;
    transform: translate(0, 0);
}

/* ============================================
   顶部导航
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
    padding: 10px 0;
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 38px;
    width: auto;
}

.logo-text {
    font-size: 1.35rem;
    font-weight: 800;
    color: #fff;
    transition: var(--transition);
    letter-spacing: 1px;
}

.header.scrolled .logo-text {
    color: var(--dark);
}

/* 导航链接 */
.nav-list {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.header.scrolled .nav-link {
    color: var(--text);
}

.nav-link:hover,
.nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}

.header.scrolled .nav-link:hover,
.header.scrolled .nav-link.active {
    color: var(--primary);
    background: var(--primary-soft);
}

/* 电话 */
.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-phone {
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.header.scrolled .header-phone {
    color: var(--primary);
}

.header-phone i {
    font-size: 1rem;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: var(--transition);
}

.header.scrolled .hamburger span {
    background: var(--dark);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   Hero 主视觉
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0A1628 0%, #132044 30%, #1A2A4A 60%, #0D1F3C 100%);
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

/* 粒子背景 */
.hero-particles {
    position: absolute;
    inset: 0;
}

/* 装饰光效 */
.hero-bg::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 109, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 10s ease-in-out infinite;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.1) 0%, transparent 60%);
    border-radius: 50%;
    animation: float 12s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    color: #fff;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-title em {
    font-style: normal;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* 右侧图示 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-illustration {
    position: relative;
    width: 280px;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, rgba(26, 109, 255, 0.2), rgba(0, 201, 167, 0.15));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: #fff;
    position: relative;
    z-index: 2;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: 0 0 40px rgba(26, 109, 255, 0.3);
}

.orbit-ring {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    animation: orbit 20s linear infinite;
}

.ring-1 {
    width: 100%;
    height: 100%;
    border-color: rgba(26, 109, 255, 0.2);
}

.ring-2 {
    width: 80%;
    height: 80%;
    border-color: rgba(0, 201, 167, 0.15);
    animation-duration: 15s;
    animation-direction: reverse;
    border-style: dashed;
}

.ring-3 {
    width: 60%;
    height: 60%;
    border-color: rgba(255, 255, 255, 0.08);
    animation-duration: 12s;
}

@keyframes orbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Hero 波浪 */
.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    line-height: 0;
}

.hero-wave svg {
    width: 100%;
    height: 80px;
}

/* ============================================
   关于我们
   ============================================ */
.about {
    background: var(--bg);
}

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

.about-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 24px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
}

.about-feature i {
    color: var(--accent);
    font-size: 1.1rem;
}

/* 统计数据 */
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px 20px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-number::after {
    content: '+';
    font-size: 2rem;
}

.stat-card:nth-child(1) .stat-number::after { content: ''; }
.stat-card:last-child .stat-number::after { content: '%'; }

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ============================================
   服务项目
   ============================================ */
.services {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

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

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

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-soft);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 20px;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: var(--primary);
    color: #fff;
}

.service-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.service-link i {
    font-size: 0.8rem;
    transition: var(--transition);
}

.service-link:hover i {
    transform: translateX(4px);
}

/* ============================================
   典型案例
   ============================================ */
.cases {
    background: var(--bg);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    display: block;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    color: inherit;
    text-decoration: none;
}

.case-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.case-img {
    height: 160px;
    background: linear-gradient(135deg, var(--primary-soft), #E8F4FD);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary);
    opacity: 0.6;
}

.case-body {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.case-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.case-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   新闻动态
   ============================================ */
.news {
    background: var(--bg-secondary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.news-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.news-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-6px);
}

.news-date {
    background: var(--primary-gradient);
    color: #fff;
    text-align: center;
    padding: 20px;
}

.news-day {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1.2;
}

.news-month {
    font-size: 0.8rem;
    opacity: 0.85;
}

.news-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-tag {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 12px;
    align-self: flex-start;
}

.news-body h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-body p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.news-link i {
    font-size: 0.75rem;
    transition: var(--transition);
}

.news-link:hover i {
    transform: translateX(4px);
}

/* ============================================
   合作伙伴
   ============================================ */
.partners {
    background: var(--bg);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.partner-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 20px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    min-height: 90px;
}

.partner-logo i {
    font-size: 2rem;
    color: var(--text-light);
    transition: var(--transition);
}

.partner-logo img {
    max-width: 100%;
    max-height: 48px;
    object-fit: contain;
    transition: var(--transition);
    opacity: 0.8;
}

.partner-logo:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
    color: var(--primary);
    transform: translateY(-3px);
}

.partner-logo:hover i {
    color: var(--primary);
}

.partner-logo:hover img {
    opacity: 1;
}

/* ============================================
   联系我们
   ============================================ */
.contact {
    background: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: var(--primary-soft);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--primary);
}

.contact-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.contact-item p,
.contact-item a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-item a:hover {
    color: var(--primary);
}

/* 表单 */
.contact-form-wrapper {
    background: var(--bg);
    padding: 36px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    font-size: 0.95rem;
    font-family: inherit;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
    background: var(--bg);
    color: var(--text);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 109, 255, 0.1);
}

.form-control::placeholder {
    color: var(--text-light);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1.3fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.8;
    opacity: 0.65;
    margin-bottom: 20px;
}

.footer-logo {
    height: 70px;
    margin-bottom: 16px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: #fff;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.footer-links li,
.footer-contact li {
    margin-bottom: 10px;
    font-size: 0.88rem;
    opacity: 0.65;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0.65;
}

.footer-contact i {
    width: 16px;
    color: var(--primary-light);
}

.footer-qrcode h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.qrcode-list {
    display: flex;
    gap: 20px;
}

.qrcode-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-align: center;
}

.qrcode-item img {
    width: 90px;
    height: 90px;
    border-radius: 8px;
    background: #fff;
    padding: 6px;
    object-fit: contain;
}

.qrcode-item span {
    font-size: 0.78rem;
    opacity: 0.65;
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    opacity: 0.5;
}

.footer-bottom a:hover {
    opacity: 1;
    color: var(--primary-light);
}

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.2rem;
    }

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

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

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

/* 手机 */
@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .section-header {
        margin-bottom: 36px;
    }

    /* 导航 */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--bg);
        padding: 80px 24px 24px;
        transition: var(--transition);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.1);
    }

    .nav.open {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-link {
        color: var(--text);
        padding: 12px 16px;
        font-size: 1rem;
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--primary);
        background: var(--primary-soft);
    }

    .hamburger {
        display: flex;
    }

    .header-phone span {
        display: none;
    }

    /* Hero */
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .hero-wave svg {
        height: 40px;
    }

    /* About */
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-features {
        grid-template-columns: 1fr 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    /* Services / Cases / News */
    .services-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    /* Partners */
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-form-wrapper {
        padding: 24px;
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .hero-desc {
        font-size: 0.95rem;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .partner-logo {
        padding: 20px 16px;
    }
}

/* ---------- 移动端遮罩 ---------- */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
}

.nav-overlay.show {
    display: block;
}

/* ============================================
   二级页面通用
   ============================================ */

/* 二级页面 Banner */
.page-banner {
    background: linear-gradient(135deg, #0A1628 0%, #132044 50%, #1A2A4A 100%);
    padding: 140px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(26, 109, 255, 0.12) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.08) 0%, transparent 60%);
    border-radius: 50%;
}

.page-banner .container {
    position: relative;
    z-index: 2;
}

.page-banner h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.65);
}

/* 面包屑 */
.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.5);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb a:hover {
    color: #fff;
}

.breadcrumb .sep {
    color: rgba(255, 255, 255, 0.25);
}

/* 二级页面主体布局 */
.page-main {
    padding: 60px 0 80px;
    background: var(--bg-secondary);
}

.page-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
}

/* ===== 侧边栏 ===== */
.sidebar {
    position: sticky;
    top: 90px;
}

.sidebar-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 24px;
}

.sidebar-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 2px solid var(--primary);
}

.sidebar-list li {
    margin-bottom: 2px;
}

.sidebar-list a {
    display: block;
    padding: 10px 14px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: var(--transition);
}

.sidebar-list a:hover,
.sidebar-list a.active {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-contact {
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
}

.sidebar-contact h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: #fff;
}

.sidebar-contact p {
    font-size: 0.85rem;
    opacity: 0.85;
    margin-bottom: 6px;
}

.sidebar-contact .phone {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 12px 0;
}

.sidebar-contact .phone a {
    color: #fff;
}

/* ===== 列表页文章列表 ===== */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.article-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    display: flex;
    gap: 24px;
    transition: var(--transition);
    cursor: pointer;
}

.article-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.article-date-box {
    min-width: 80px;
    text-align: center;
    padding: 12px 8px;
    background: var(--primary-soft);
    border-radius: var(--radius-sm);
    align-self: flex-start;
}

.article-date-box .day {
    display: block;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.article-date-box .month {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.article-content {
    flex: 1;
}

.article-content .tag {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 8px;
}

.article-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-content h3 a {
    color: var(--dark);
}

.article-content h3 a:hover {
    color: var(--primary);
}

.article-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    font-size: 0.82rem;
    color: var(--text-light);
}

.article-meta i {
    margin-right: 4px;
}

/* 分类标签页 */
.category-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1.5px solid var(--border);
    border-radius: 20px;
    background: var(--bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.category-tab:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.category-tab.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 40px;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
    background: var(--bg);
}

.page-link:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.page-link.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 案例列表页 ===== */
.case-list-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.case-list-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.case-list-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.case-list-img {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-soft), #E8F4FD);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--primary);
    opacity: 0.5;
}

.case-list-body {
    padding: 24px;
}

.case-list-body .industry-tag {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.case-list-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.case-list-body h3 a {
    color: var(--dark);
}

.case-list-body h3 a:hover {
    color: var(--primary);
}

.case-list-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== 详情页 ===== */
.detail-article {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 40px;
}

.detail-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.detail-header h1 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    line-height: 1.4;
}

.detail-meta {
    display: flex;
    gap: 20px;
    font-size: 0.85rem;
    color: var(--text-light);
    flex-wrap: wrap;
}

.detail-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.detail-body {
    font-size: 1rem;
    line-height: 2;
    color: var(--text);
}

.detail-body p {
    margin-bottom: 20px;
}

.detail-body h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin: 32px 0 16px;
}

.detail-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin: 24px 0 12px;
}

.detail-body ul,
.detail-body ol {
    margin: 0 0 20px 20px;
}

.detail-body li {
    margin-bottom: 8px;
}

.detail-body img {
    border-radius: var(--radius-sm);
    margin: 24px 0;
}

.detail-body blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    padding: 16px 20px;
    margin: 20px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

/* 详情页底部导航 */
.detail-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.detail-nav a {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.detail-nav a:hover {
    color: var(--primary-dark);
}

.detail-nav .disabled {
    color: var(--text-light);
    pointer-events: none;
}

/* ===== 二级页面响应式 ===== */
@media (max-width: 1024px) {
    .page-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .case-list-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .page-banner {
        padding: 110px 0 40px;
    }

    .page-banner h1 {
        font-size: 1.6rem;
    }

    .article-item {
        flex-direction: column;
        gap: 16px;
        padding: 20px;
    }

    .article-date-box {
        display: flex;
        align-items: center;
        gap: 8px;
        min-width: auto;
        padding: 8px 16px;
    }

    .article-date-box .day {
        font-size: 1.2rem;
    }

    .case-list-grid {
        grid-template-columns: 1fr;
    }

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

    .detail-article {
        padding: 24px;
    }

    .detail-header h1 {
        font-size: 1.3rem;
    }

    .detail-meta {
        gap: 12px;
    }
}

/* ============================================
   导航下拉菜单
   ============================================ */
.nav-item {
    position: relative;
}

.sub-nav {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 140px;
    background: #fff;
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 40px rgba(0,0,0,0.12);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
    z-index: 100;
    margin-top: 4px;
}

.nav-item:hover .sub-nav {
    opacity: 1;
    visibility: visible;
}

.sub-link {
    display: block;
    padding: 10px 20px;
    font-size: 0.88rem;
    color: var(--text);
    white-space: nowrap;
    transition: var(--transition);
}

.sub-link:hover {
    background: var(--primary-soft);
    color: var(--primary);
}

.nav-arrow {
    font-size: 0.65rem;
    margin-left: 4px;
    transition: var(--transition);
}

.nav-item:hover .nav-arrow {
    transform: rotate(180deg);
}

/* 移动端子菜单 */
@media (max-width: 768px) {
    .sub-nav {
        position: static;
        transform: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        padding: 0 0 0 20px;
        background: transparent;
        display: none;
        margin-top: 0;
    }

    .nav-item.has-sub.open .sub-nav {
        display: block;
    }

    .sub-link {
        color: var(--text-secondary);
        font-size: 0.85rem;
        padding: 8px 16px;
    }

    .sub-link:hover {
        color: var(--primary);
        background: transparent;
    }
}

/* ============================================
   关于我们子页面 - 核心价值观
   ============================================ */
.about-hero-section {
    margin-bottom: 48px;
}

.about-cover {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 32px;
}

.about-cover img {
    width: 100%;
    display: block;
}

.about-intro-text {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text);
}

.about-intro-text p {
    margin-bottom: 16px;
}

.about-subtitle {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    text-align: center;
    margin-bottom: 36px;
    position: relative;
    padding-bottom: 16px;
}

.about-subtitle::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
}

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

.value-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.value-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.value-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-soft);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
    margin: 0 auto 16px;
    transition: var(--transition);
}

.value-card:hover .value-icon {
    background: var(--primary);
    color: #fff;
}

.value-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.value-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   发展大事记 - 时间线
   ============================================ */
.milestone-intro {
    margin-bottom: 40px;
    text-align: left;
    color: var(--text-secondary);
}

.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--accent), transparent);
}

.timeline-item {
    position: relative;
    padding: 0 0 40px 30px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -34px;
    top: 4px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border: 3px solid #fff;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-date {
    display: inline-block;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.timeline-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.timeline-content p, .timeline-body {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.timeline-body p {
    margin-bottom: 8px;
    text-align: left;
}

/* ============================================
   荣誉资质 - 证书卡片
   ============================================ */
.qual-intro {
    margin-bottom: 36px;
    text-align: left;
    color: var(--text-secondary);
}

.qual-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.qual-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.qual-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.qual-img {
    height: 200px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: var(--text-light);
    overflow: hidden;
}

.qual-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 20px;
}

.qual-body {
    padding: 20px;
    text-align: center;
}

.qual-body h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.qual-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .values-grid,
    .qual-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline::before {
        left: 8px;
    }

    .timeline-dot {
        left: -28px;
        width: 12px;
        height: 12px;
    }

    .timeline-item {
        padding-left: 20px;
    }
}

@media (max-width: 480px) {
    .values-grid,
    .qual-grid {
        grid-template-columns: 1fr;
    }
}