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

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #172554;
    --accent-color: #2563eb;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei','Heiti SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
}

/* 页面加载动画 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    border-bottom: 1px solid #eef2f7;
}

.page-loader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    color: var(--text-primary);
}

.loader-logo h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.loader-spinner {
    margin: 2rem 0;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(37, 99, 235, 0.15);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader-text {
    font-size: 1.1rem;
    opacity: 0.9;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.9; }
    50% { opacity: 0.6; }
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-logo h2 {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.5rem;
}

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

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

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* 主页横幅 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: #ffffff;
    overflow: hidden;
}



@keyframes sparkle {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(-100px) translateY(-100px); }
}

.hero-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    z-index: 2;
    position: relative;
}

.hero-content {
    color: var(--text-primary);
    max-width: 720px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    letter-spacing: 0;
}

.gradient-text {
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
    max-width: 680px;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
    border: none;
    position: relative;
}





.btn-primary:hover {
    filter: brightness(1.03);
    transform: translateY(-1px);
    box-shadow: none;
}

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





.btn-secondary:hover {
    background: rgba(37, 99, 235, 0.04);
    transform: translateY(-1px);
    box-shadow: none;
    border-color: var(--primary-color);
}

/* 技术网格动画 */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.75rem;
    color: var(--text-primary);
}
.hero-highlights li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow-sm);
}
.hero-highlights i {
    color: var(--primary-color);
}

/* 英雄区极简商务风背景（细格纹） */
.hero.hero--grid {
    background-color: #ffffff;
    background-image:
      linear-gradient(to right, rgba(17,24,39,0.04) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(17,24,39,0.04) 1px, transparent 1px);
    background-size: 24px 24px;
}
.hero--grid .hero-container {
    padding-bottom: 56px;
    border-bottom: 1px solid #eef2f7;
}
.hero--grid .hero-visual {
    justify-content: flex-start;
}

/* 英雄区纯白极简布局（文案+信任条） */
.hero.hero--plain .hero-container { grid-template-columns: 1fr; gap: 2rem; }
.hero.hero--plain { min-height: 88vh; }
.hero--plain .hero-visual { justify-content: flex-start; }

/* 英雄区信任条 */
.hero-stats {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
    color: var(--text-secondary);
    font-weight: 600;
}
.hero-stats .sep {
    width: 1px;
    height: 18px;
    background: #e5e7eb;
    display: inline-block;
}

/* 隐藏“AI风格”的视觉元素 */
.tech-grid, .tech-item, .hero-bg-animation { display: none !important; }

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    perspective: 1000px;
}

.tech-item {
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
    transition: transform 0.3s ease;
}

.tech-item:nth-child(1) { animation-delay: 0s; }
.tech-item:nth-child(2) { animation-delay: 1.5s; }
.tech-item:nth-child(3) { animation-delay: 3s; }
.tech-item:nth-child(4) { animation-delay: 4.5s; }

.tech-item:hover {
    transform: rotateY(15deg) rotateX(15deg) scale(1.1);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 背景动画 */
.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

/* 核心优势 */
.advantages {
    padding: 5.5rem 0;
    background: var(--bg-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

/* 服务项目 */
.services {
    padding: 7rem 0;
    background: white;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: 0;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

/* removed sweep overlay for a more business look */

/* removed */

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.service-icon {
    display: none;
}

.service-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

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

.service-card li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.service-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 解决方案 */
.solutions {
    padding: 7rem 0;
    background: var(--bg-secondary);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.solution-item {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
}

.solution-item:hover {
    transform: translateY(-5px);
}

.solution-bg {
    width: 80px;
    height: 80px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.solution-bg i {
    font-size: 2rem;
    color: white;
}

/* 行业解决方案 · 视觉升级 */
.solutions .solution-bg {
  position: relative;
  transition: transform .3s ease, box-shadow .3s ease, background .3s ease;
  box-shadow: 0 6px 14px rgba(15,23,42,.06);
}

/* 悬浮微动效：图标底块轻微上浮与投影增强 */
.solutions .solution-item:hover .solution-bg {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(15,23,42,.12);
}

/* 渐变主题按序区分，形成品牌化色板 */
.solutions .solution-item:nth-child(1) .solution-bg {
  background: linear-gradient(135deg, #60a5fa, #2563eb);
  border: 1px solid rgba(37,99,235,.22);
}
.solutions .solution-item:nth-child(2) .solution-bg {
  background: linear-gradient(135deg, #f59e0b, #f43f5e);
  border: 1px solid rgba(244,63,94,.22);
}
.solutions .solution-item:nth-child(3) .solution-bg {
  background: linear-gradient(135deg, #10b981, #06b6d4);
  border: 1px solid rgba(16,185,129,.22);
}
.solutions .solution-item:nth-child(4) .solution-bg {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: 1px solid rgba(99,102,241,.22);
}

/* 标题下划线点缀，提升信息分组的视觉层次 */
.solutions .solution-item h3 {
  position: relative;
  margin-top: .5rem;
}
.solutions .solution-item h3::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  margin: .5rem auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(37,99,235,0), rgba(37,99,235,.8), rgba(37,99,235,0));
  opacity: .7;
}

.solution-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.solution-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 关于我们 */
.about {
    padding: 7rem 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-intro {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.feature-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 0.25rem;
}

.feature-item h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.tech-stack {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
}

.tech-category {
    margin-bottom: 2rem;
}

.tech-category:last-child {
    margin-bottom: 0;
}

.tech-category h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tags span {
    background: #fff;
    color: var(--primary-color);
    border: 1px solid rgba(37,99,235,0.25);
    padding: 0.4rem 0.8rem;
    border-radius: 18px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* 联系我们 */
.contact {
    padding: 7rem 0;
    background: #ffffff;
    color: var(--text-primary);
}

.contact .section-header h2,
.contact .section-header p {
    color: inherit;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-top: 0.25rem;
}

.contact-item h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--text-secondary);
}

/* 联系我们：去除 QQ 与邮箱链接下划线，仅在悬浮时变色 */
.contact-info a {
    text-decoration: none;
    color: var(--text-secondary);
}
.contact-info a:hover,
.contact-info a:focus-visible {
    text-decoration: none;
    color: var(--primary-color);
}

.contact-form {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 8px;
    background: #ffffff;
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9ca3af;
}

.form-group select {
    color: var(--text-primary);
}

.form-group select option {
    background: #ffffff;
    color: var(--text-primary);
}

.contact-form .btn-primary {
    width: 100%;
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 1rem;
    font-size: 1.05rem;
}

.contact-form .btn-primary:hover {
    background: var(--secondary-color);
}

/* 页脚 */
.footer {
    background: #ffffff;
    color: var(--text-primary);
    padding: 3rem 0 1rem;
    border-top: 1px solid #eef2f7;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #f3f4f6;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.social-links a:hover {
    background: var(--primary-color);
    color: #ffffff;
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(15,23,42,.08);
    margin-top: 28px;
    padding-top: 16px;
    text-align: center;
    color: rgba(15,23,42,.66);
    font-size: .95rem;
}
.footer-bottom p {
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.footer-bottom a {
    color: inherit;
    text-decoration: none;
    position: relative;
    padding-bottom: 2px;
    transition: color .2s ease;
}
.footer-bottom a::after {
    content: "";
    position: absolute;
    left: 0; bottom: 0;
    width: 0; height: 2px;
    background: currentColor;
    transition: width .25s ease;
}
.footer-bottom a:hover,
.footer-bottom a:focus-visible { color: var(--primary-color); }
.footer-bottom a:hover::after,
.footer-bottom a:focus-visible::after { width: 100%; }

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
    }
    
    .nav-menu a {
        font-size: 1.2rem;
        padding: 1rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .tech-item {
        width: 100px;
        height: 100px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 英雄区导语（城市/定位） */
.hero-overline {
    font-size: .95rem;
    font-weight: 600;
    letter-spacing: .06em;
    color: var(--text-secondary);
    margin-bottom: .75rem;
}

/* 英雄区摄影背景（更企业） */
.hero.hero--photo {
    background: #f7f9fc url('https://images.unsplash.com/photo-1549692520-acc6669e2f0c?q=80&w=1600&auto=format&fit=crop') center/cover no-repeat;
}
.hero.hero--photo::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.62);
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* 顶部CTA按钮（导航） */
.btn-nav {
    padding: 10px 16px;
    border-radius: 8px;
    font-weight: 600;
}
@media (max-width: 768px) {
    .nav-cta { display: none; }
}

/* CTA 行动条 */
.cta-band {
    background: #ffffff;
    padding: 48px 0;
    border-top: 1px solid #eef2f7;
    border-bottom: 1px solid #eef2f7;
}
.cta-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}
.cta-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: .25rem;
}
.cta-text p {
    color: var(--text-secondary);
}

/* 客户案例 */
.cases {
    padding: 6rem 0;
    background: #fff;
}
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.case-card {
    background: #fff;
    border: 1px solid rgba(0,0,0,.06);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: transform .3s ease, box-shadow .3s ease;
    height: 100%;
}
.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.case-logo {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: .75rem;
}

.case-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: .75rem;
    color: var(--text-primary);
}
.case-meta {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: .5rem;
    color: var(--text-secondary);
}

/* 合作伙伴 Logo 带 */
.partners {
    padding: 4rem 0;
    background: var(--bg-secondary);
}
.partner-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    justify-items: center;
    align-items: center;
    opacity: .9;
}
.partner-logos a.logo {
    width: 100%;
    height: 96px;
    min-height: 80px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 24px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 1px 2px rgba(0,0,0,.04);
    font-weight: 700;
    color: var(--text-secondary);
    text-decoration: none;
    filter: none;
    opacity: .95;
    letter-spacing: .02em;
    transition: transform .2s ease, box-shadow .2s ease, filter .2s ease, opacity .2s ease, color .2s ease;
}
.partner-logos a.logo::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--brand, var(--primary-color));
    display: inline-block;
    margin-right: 8px;
    box-shadow: 0 0 0 1px rgba(0,0,0,.06) inset;
}
.partner-logos a.logo:hover,
.partner-logos a.logo:focus-visible {
    transform: translateY(-3px);
    filter: none;
    opacity: 1;
    color: var(--text-primary);
    box-shadow: 0 12px 24px rgba(15,23,42,.12), 0 0 0 3px var(--ring);
}
/* 品牌色变量（按序） */
.partner-logos a.logo:nth-child(1) { --brand: #00A4FF; } /* Tencent Cloud */
.partner-logos a.logo:nth-child(2) { --brand: #FF6A00; } /* Alibaba Cloud */
.partner-logos a.logo:nth-child(3) { --brand: #D81E06; } /* Huawei Cloud */
.partner-logos a.logo:nth-child(4) { --brand: #FF9900; } /* AWS */
.partner-logos a.logo:nth-child(5) { --brand: #0078D4; } /* Azure */
.partner-logos a.logo:nth-child(6) { --brand: #4285F4; } /* GCP */

/* 合作伙伴徽标：图片版本样式 */
.partner-logos { gap: 32px; }
.partner-logos a.logo::before { display: none !important; content: none !important; }
.partner-logos a.logo { filter: none; }
.partner-logos a.logo img {
  height: clamp(48px, 4vw, 80px);
  width: auto;
  max-width: 85%;
  display: block;
  margin: 0 auto;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: .95;
  transition: filter .2s ease, opacity .2s ease, transform .2s ease;
}
.partner-logos a.logo:hover img,
.partner-logos a.logo:focus-visible img { filter: none; opacity: 1; }

@media (min-width: 1200px) {
  .partner-logos { grid-template-columns: repeat(6, 1fr); }
  .partner-logos a.logo { height: 112px; }
  .partner-logos a.logo img { height: clamp(64px, 5vw, 96px); }
}

/* 顶部信息条 */
.topbar {
    background: #ffffff;
    border-bottom: 1px solid #eef2f7;
    color: var(--text-secondary);
    font-size: 0.95rem;
}
.topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
}
.topbar i { color: var(--primary-color); margin-right: 6px; }
.topbar-right span { margin-left: 12px; }
.topbar-right a { margin-left: 12px; color: var(--text-secondary); text-decoration: none; transition: color .2s ease; }
.topbar-right a:hover { color: var(--primary-color); }
.topbar .sep { opacity: .4; margin: 0 8px; }

/* 顶部信息条存在时，导航下移 */
.navbar { top: 40px; }
@media (max-width: 768px) {
    .nav-menu {
        top: 120px;
        height: calc(100vh - 120px);
    }
}

/* 交付流程 */
.process { padding: 6rem 0; background: #fff; }
.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}
.step {
    background: #fff;
    border: 1px solid rgba(0,0,0,.06);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform .3s ease, box-shadow .3s ease;
}
.step .num {
    width: 40px; height: 40px;
    border-radius: 10px;
    background: linear-gradient(180deg, rgba(37,99,235,.12), rgba(37,99,235,.05));
    border: 1px solid rgba(37,99,235,.25);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-primary); font-weight: 800;
    margin-bottom: .75rem;
    box-shadow: 0 2px 6px rgba(15,23,42,.06), inset 0 1px 0 rgba(255,255,255,.5);
}

/* 交付流程 · 序号徽章按序配色（与行业解决方案色板保持一致） */
.process-steps .step:nth-child(1) .num {
  background: linear-gradient(135deg, #60a5fa, #2563eb);
  border-color: rgba(37,99,235,.35);
  color: #fff;
}
.process-steps .step:nth-child(2) .num {
  background: linear-gradient(135deg, #f59e0b, #f43f5e);
  border-color: rgba(244,63,94,.35);
  color: #fff;
}
.process-steps .step:nth-child(3) .num {
  background: linear-gradient(135deg, #10b981, #06b6d4);
  border-color: rgba(16,185,129,.35);
  color: #fff;
}
.process-steps .step:nth-child(4) .num {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border-color: rgba(99,102,241,.35);
  color: #fff;
}
.step h4 { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin-bottom: .5rem; }
.step p { color: var(--text-secondary); }



/* 资质与合规 */
.certs { padding: 5rem 0; background: var(--bg-secondary); }
.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}
.cert-badge {
    background: #fff;
    border: 1px solid rgba(0,0,0,.06);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: .75rem;
    box-shadow: var(--shadow-sm);
}
.cert-badge i { color: var(--primary-color); }
.cert-badge h4 { font-size: 1rem; font-weight: 700; color: var(--text-primary); }
.cert-badge p { font-size: .95rem; color: var(--text-secondary); }

/* =================== 高端视觉增强（增量覆盖） =================== */
:root { --ring: rgba(37,99,235,.35); }

body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

/* 更宽的内容容器 */
.container, .nav-container, .hero-container { max-width: 1200px; }

/* 玻璃态滚动导航 */
.navbar.scrolled {
  background: rgba(255,255,255,0.98);
  box-shadow: 0 8px 32px rgba(15,23,42,.08);
  border-bottom-color: rgba(0,0,0,.08);
}

/* 按钮质感升级 */
.btn { border-radius: 12px; }
.btn-primary {
  background: linear-gradient(180deg, #2563eb, #1e40af);
  border: 1px solid rgba(30,64,175,.5);
  box-shadow: 0 8px 16px rgba(37,99,235,.2), inset 0 1px 0 rgba(255,255,255,.2);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(37,99,235,.28), inset 0 1px 0 rgba(255,255,255,.25);
  filter: none;
}
.btn-secondary {
  border: 1.5px solid rgba(37,99,235,.45);
  background: linear-gradient(180deg, rgba(37,99,235,.06), rgba(37,99,235,.02));
}

/* 英雄区柔光渐变背景（不改变现有结构） */
.hero.hero--plain::before {
  content: '';
  position: absolute;
  inset: -10%;
  background:
    radial-gradient(600px 300px at 10% 10%, rgba(37,99,235,.10), transparent 60%),
    radial-gradient(500px 250px at 90% 20%, rgba(16,185,129,.10), transparent 60%),
    radial-gradient(600px 300px at 50% 100%, rgba(99,102,241,.10), transparent 60%);
  filter: blur(30px);
  z-index: 1;
}
.hero .hero-container { position: relative; z-index: 2; }

/* 信任条、数字与标题点缀 */
.hero-stats { background: #fff; border: 1px solid rgba(0,0,0,.06); border-radius: 12px; padding: .75rem 1rem; }
.stat-number {
  background: linear-gradient(180deg, #111827, #334155);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.section-header h2 { position: relative; display: inline-block; }
.section-header h2::after {
  content: '';
  position: absolute; left: 50%; transform: translateX(-50%);
  bottom: -12px; width: 64px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, rgba(37,99,235,0), rgba(37,99,235,.8), rgba(37,99,235,0));
}

/* 卡片“渐变描边 + 高级阴影” */
.service-card, .solution-item, .case-card, .cert-badge, .stat-item, .contact-form, .tech-stack, .step {
  background: linear-gradient(#fff, #fff) padding-box,
              linear-gradient(135deg, rgba(37,99,235,.18), rgba(15,23,42,.08)) border-box;
  border: 1px solid transparent;
}
.service-card:hover, .solution-item:hover, .case-card:hover, .stat-item:hover, .step:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(15,23,42,.1);
}

/* 表单聚焦高亮 */
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: rgba(37,99,235,.45); box-shadow: 0 0 0 4px var(--ring);
}

/* 细节润色 */
.partner-logos .logo { box-shadow: 0 1px 0 rgba(0,0,0,.03) inset; }
.cta-band { background: linear-gradient(180deg, #fff, #f8fafc); }
.topbar { backdrop-filter: blur(8px); }

/* 表单错误态与按钮加载态、Toast 通知 */
.form-group .field-error { border-color: #ef4444 !important; box-shadow: 0 0 0 4px rgba(239,68,68,.18); }

.btn[disabled], .btn.btn--loading { opacity: .7; cursor: not-allowed; }
.btn.btn--loading { position: relative; }
.btn.btn--loading::after {
  content: '';
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.5);
  border-top-color: #fff;
  border-radius: 50%;
  display: inline-block;
  margin-left: 8px;
  vertical-align: -2px;
  animation: spin .6s linear infinite;
}

/* Toast 通知 */
.toast {
  position: fixed; top: 20px; right: 20px;
  padding: 12px 16px; border-radius: 10px; color: #fff;
  font-weight: 600; z-index: 10000;
  transform: translateX(100%);
  transition: transform .3s ease, opacity .3s ease;
  box-shadow: 0 10px 20px rgba(0,0,0,.15);
  max-width: 320px;
}
.toast.show { transform: translateX(0); }
.toast--success { background: linear-gradient(180deg, #10b981, #059669); }
.toast--error   { background: linear-gradient(180deg, #ef4444, #dc2626); }
.toast--info    { background: linear-gradient(180deg, #3b82f6, #1d4ed8); }

/* 跳转到主要内容（可访问性） */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: #111827; color: #fff; padding: 10px 14px; border-radius: 8px;
  z-index: 2000;
}
.skip-link:focus { left: 24px; top: 16px; outline: none; box-shadow: 0 0 0 4px var(--ring); }

/* 暗色模式轻量适配（跟随系统偏好） */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #e5e7eb;
    --text-secondary: #94a3b8;
    --bg-primary: #0b1220;
    --bg-secondary: #0f172a;
  }
  body { background: var(--bg-primary); color: var(--text-primary); }
  .navbar { background: rgba(15,23,42,0.75); border-bottom-color: rgba(255,255,255,.08); }
  .navbar.scrolled { background: rgba(15,23,42,0.9); box-shadow: 0 8px 32px rgba(0,0,0,.35); }
  .topbar { background: rgba(15,23,42,0.6); border-bottom-color: rgba(255,255,255,.08); }
  .services, .about, .contact, .cases, .process, .footer { background: var(--bg-primary); }
  .service-card, .solution-item, .case-card, .cert-badge, .stat-item, .contact-form, .tech-stack {
    background: #0f172a;
    border-color: rgba(255,255,255,.06);
  }
  .section-header h2, .hero-title {
    background: linear-gradient(180deg, #e5e7eb, #94a3b8);
    -webkit-background-clip: text; background-clip: text; color: transparent;
  }
}

/* 顶部信息条滚动隐藏（与导航联动） */
.topbar { transition: transform .3s ease, opacity .3s ease; will-change: transform; }
.compact-header .topbar { transform: translateY(-100%); opacity: 0; }
.compact-header .navbar { top: 0; }

/* 回到顶部按钮 */
.back-to-top {
  position: fixed; right: 24px; bottom: 28px; z-index: 1100;
  width: 44px; height: 44px; border: none; cursor: pointer;
  border-radius: 12px; color: #fff; font-weight: 800; line-height: 1;
  background: linear-gradient(180deg, #2563eb, #1e40af);
  box-shadow: 0 12px 24px rgba(37,99,235,.28), inset 0 1px 0 rgba(255,255,255,.25);
  opacity: 0; transform: translateY(10px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, box-shadow .2s ease;
}
.back-to-top:hover { box-shadow: 0 16px 32px rgba(37,99,235,.34), inset 0 1px 0 rgba(255,255,255,.3); }
.back-to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* 全局平滑滚动与选中态 */
html { scroll-behavior: smooth; }
::selection { background: rgba(37,99,235,.14); color: #0f172a; }

/* focus-visible 无障碍高亮（与表单聚焦统一） */
.btn:focus-visible,
.nav-menu a:focus-visible,
.topbar a:focus-visible,
.footer-section a:focus-visible,
.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible {
  outline: none;
  border-color: rgba(37,99,235,.45);
  box-shadow: 0 0 0 4px var(--ring);
  border-radius: 10px;
}

/* 减少动态偏好支持 */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* 英雄标题渐变字（低调深色） */
.hero-title {
  background: linear-gradient(180deg, #0f172a, #334155);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* Anchor 滚动偏移，防止被固定导航遮挡 */
section { scroll-margin-top: 120px; }

/* 移动端整体优化（仅 ≤768px 生效） */
@media (max-width: 768px) {
  /* 锚点偏移与容器内边距 */
  section { scroll-margin-top: 80px; }
  .container { padding: 0 20px; }

  /* 分区留白与标题区 */
  .services, .solutions, .about, .contact, .cases, .process { padding: 4rem 0; }
  .section-header { margin-bottom: 2.5rem; }
  .section-header h2 { font-size: 2rem; }

  /* 按钮适度收紧，避免换行 */
  .hero .hero-buttons .btn { padding: 12px 20px; font-size: 1rem; }
}

/* 导航激活态高亮与下划线展开 */
.nav-menu a.active { color: var(--primary-color); }
.nav-menu a.active::after { width: 100%; }

/* 移动端性能热修复（减少卡顿，仅 ≤768px） */
@media (max-width: 768px) {
  /* 1) 禁用昂贵的模糊与大面积滤镜 */
  .navbar { backdrop-filter: none !important; }
  .hero.hero--plain::before { display: none !important; }
  .hero-bg-animation { display: none !important; }

  /* 2) 关闭全局平滑滚动，避免长距离滚动卡顿 */
  html { scroll-behavior: auto; }

  /* 3) 弱化阴影与悬浮动画（移动端无悬停也更省资源） */
  .service-card, .solution-item, .case-card, .stat-item, .step { box-shadow: var(--shadow-sm) !important; }
  .service-card:hover, .solution-item:hover, .case-card:hover, .stat-item:hover, .step:hover {
    transform: none !important;
    box-shadow: var(--shadow-sm) !important;
  }
}

/* 页脚底部信息 · 样式优化 */
.footer .footer-bottom {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid rgba(15,23,42,.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 16px;
  color: rgba(15,23,42,.66);
  font-size: .95rem;
}
.footer .footer-bottom p {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer .footer-bottom a {
  color: inherit;
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color .2s ease;
}
.footer .footer-bottom a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: currentColor;
  transition: width .25s ease;
}
.footer .footer-bottom a:hover,
.footer .footer-bottom a:focus-visible { color: var(--primary-color); }
.footer .footer-bottom a:hover::after,
.footer .footer-bottom a:focus-visible::after { width: 100%; }

@media (max-width: 640px) {
  .footer .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
}

/* 手机端隐藏顶部信息条（城市与QQ），并恢复导航定位 */
@media (max-width: 768px) {
  .topbar { display: none !important; }
  .navbar { top: 0 !important; }
  .nav-menu {
    top: 80px !important; /* 仅导航高度 */
    height: calc(100vh - 80px) !important;
  }
}
/* 顶部信息条 · 移动端单行精简（隐藏邮箱） */
@media (max-width: 768px) {
  .topbar-inner {
    height: 40px;
    padding: 0;
    flex-wrap: nowrap;
  }
  .topbar-left,
  .topbar-right {
    width: auto;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
  }
  /* 仅保留 QQ，隐藏邮箱与竖线，防溢出 */
  .topbar-right a[href^="mailto:"],
  .topbar-right .email,
  .topbar-right .mail,
  .topbar .sep { display: none !important; }
  .topbar-right a,
  .topbar-right span {
    display: inline-flex;
    flex: 0 0 auto;
    max-width: 100%;
    white-space: nowrap;
  }
  .topbar i { margin-right: 4px; }
  /* 顶栏为 40px，恢复导航/菜单定位 */
  .navbar { top: 40px; }
  .nav-menu {
    top: 120px; /* 40 顶栏 + 80 导航高度 */
    height: calc(100vh - 120px);
  }
}