/* ========================================
   超航网络 - 软件公司官网样式
   主题色：蓝色系（支持日间/夜间模式切换）
   ======================================== */

/* CSS 变量定义 - 日间模式（默认） */
:root {
    /* 主色调 */
    --primary-blue: #0066ff;
    --primary-blue-dark: #0052cc;
    --primary-blue-light: #3399ff;
    --primary-blue-glow: rgba(0, 102, 255, 0.2);

    /* 背景色系 - 日间模式 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-border: #e2e8f0;

    /* 文字色系 - 日间模式 */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;

    /* 灰色系 */
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, #00d4ff 100%);
    --gradient-bg: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    --gradient-card: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);

    /* 阴影 - 日间模式 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px var(--primary-blue-glow);

    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 间距 */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 夜间模式变量覆盖 */
[data-theme="dark"] {
    /* 主色调 - 夜间模式发光效果更强 */
    --primary-blue-glow: rgba(0, 102, 255, 0.3);

    /* 背景色系 - 夜间模式 */
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-tertiary: #1a1a1a;
    --bg-card: #1e1e1e;
    --bg-border: #2a2a2a;

    /* 文字色系 - 夜间模式 */
    --text-primary: #ffffff;
    --text-secondary: #d4d4d4;
    --text-tertiary: #a3a3a3;
    --text-muted: #737373;

    /* 灰色系 - 夜间模式 */
    --gray-100: #262626;
    --gray-200: #2a2a2a;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #f5f5f5;

    /* 渐变 - 夜间模式 */
    --gradient-bg: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    --gradient-card: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);

    /* 阴影 - 夜间模式 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

ul {
    list-style: none;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* 容器 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-img {
    height: 40px;
    width: auto;
}

.footer .logo-img {
    height: 35px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 20px 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(0, 102, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
        var(--gradient-bg);
}

[data-theme="dark"] .hero-gradient {
    background:
        radial-gradient(ellipse at 20% 20%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        var(--gradient-bg);
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-blue);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 15s infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 0.5;
    }
    90% {
        opacity: 0.5;
    }
    100% {
        transform: translateY(-100vh) translateX(100px);
        opacity: 0;
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-tertiary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--primary-blue-glow);
}

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

.btn-secondary:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

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

/* 统计数据 */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--gray-400);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--primary-blue);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ========================================
   通用区块样式
   ======================================== */
section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-blue);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-tertiary);
    max-width: 600px;
    margin: 0 auto;
}

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

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

.about-text h3 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.about-text p {
    color: var(--text-tertiary);
    margin-bottom: 30px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.feature-item i {
    color: var(--primary-blue);
    font-size: 1.1rem;
}

.about-visual {
    display: grid;
    gap: 20px;
}

.visual-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 16px;
    padding: 30px;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.visual-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.card-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.card-icon i {
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.visual-card h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

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

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    padding: 40px 30px;
    position: relative;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.service-card.featured {
    border-color: var(--primary-blue);
    background: linear-gradient(145deg, rgba(0, 102, 255, 0.05) 0%, var(--bg-card) 100%);
}

[data-theme="dark"] .service-card.featured {
    background: linear-gradient(145deg, rgba(0, 102, 255, 0.1) 0%, var(--bg-card) 100%);
}

.service-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gradient-primary);
    color: #fff;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.service-icon {
    width: 70px;
    height: 70px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

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

.service-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.service-card p {
    color: var(--text-tertiary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-features {
    margin-bottom: 24px;
}

.service-features li {
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--bg-border);
    font-size: 0.95rem;
}

.service-features li:last-child {
    border-bottom: none;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-blue);
    font-weight: 600;
}

.service-link:hover {
    color: var(--primary-blue-dark);
}

.service-link i {
    transition: var(--transition-fast);
}

.service-link:hover i {
    transform: translateX(5px);
}

/* ========================================
   案例展示
   ======================================== */
.cases {
    background: var(--bg-secondary);
}

.cases-filter {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 24px;
    border-radius: 30px;
    color: var(--text-tertiary);
    font-weight: 500;
    transition: var(--transition-fast);
    border: 1px solid var(--bg-border);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-blue);
    color: #fff;
    border-color: var(--primary-blue);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.case-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.case-image {
    position: relative;
    height: 200px;
    background: var(--bg-tertiary);
    overflow: hidden;
}

.case-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--gray-400);
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 102, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-link {
    width: 50px;
    height: 50px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    font-size: 1.2rem;
    transform: scale(0);
    transition: var(--transition-normal);
}

.case-card:hover .case-link {
    transform: scale(1);
}

.case-content {
    padding: 30px;
}

.case-category {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-blue);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.case-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.case-content p {
    color: var(--text-tertiary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.case-tech {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.case-tech span {
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ========================================
   产品展示
   ======================================== */
.products {
    background: var(--bg-primary);
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.product-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.product-description h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.product-description p {
    color: var(--text-tertiary);
    line-height: 1.8;
    font-size: 1rem;
}

.product-meta {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 20px;
    transition: var(--transition-normal);
}

.meta-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.meta-item i {
    font-size: 1.5rem;
    color: var(--primary-blue);
    width: 40px;
    height: 40px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.meta-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: block;
}

.meta-value {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.product-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.product-buttons .btn {
    flex: 1;
    min-width: 140px;
    justify-content: center;
}

.product-gallery {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--shadow-sm);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.gallery-item {
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--bg-border);
    cursor: pointer;
}

.gallery-item:hover {
    transform: scale(1.05);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.gallery-item:first-child {
    grid-column: span 2;
}

.gallery-item:first-child img {
    height: 300px;
}

.image-preview {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    cursor: pointer;
}

.image-preview.active {
    opacity: 1;
    visibility: visible;
}

.image-preview img {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

/* ========================================
   技术栈
   ======================================== */
.tech-stack {
    background: var(--bg-primary);
    padding: 80px 0;
}

.tech-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-tertiary);
    transition: var(--transition-fast);
}

.tech-item:hover {
    color: var(--primary-blue);
    transform: translateY(-5px);
}

.tech-item i {
    font-size: 3rem;
}

.tech-item span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ========================================
   团队
   ======================================== */
.team {
    background: var(--bg-secondary);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(260px, 1fr));
    gap: 30px;
    max-width: 1260px;
    margin: 0 auto;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.team-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.team-avatar {
    width: 100px;
    height: 100px;
    margin: 0 auto 24px;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #00d4ff 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: #fff;
}

.team-card h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.team-role {
    display: block;
    color: var(--primary-blue);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.team-card p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.team-social {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.team-social a {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

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

/* ========================================
   客户评价
   ======================================== */
.testimonials {
    background: var(--bg-primary);
}

.testimonials-slider {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    padding: 40px;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.testimonial-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-glow);
}

.testimonial-content {
    position: relative;
    margin-bottom: 30px;
}

.testimonial-content i {
    color: var(--primary-blue);
    font-size: 2rem;
    opacity: 0.3;
    margin-bottom: 16px;
    display: block;
}

.testimonial-content p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-avatar {
    width: 50px;
    height: 50px;
}

.author-avatar i {
    font-size: 3rem;
    color: var(--text-muted);
}

.author-info h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 4px;
}

.author-info span {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item {
    display: flex;
    gap: 20px;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 1.25rem;
    color: var(--primary-blue);
}

.info-content h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 8px;
}

.info-content p {
    color: var(--text-tertiary);
    font-size: 0.95rem;
    line-height: 1.6;
}


.contact-qrcode {
    max-width: 150px;
    margin-top: 12px;
    border-radius: 8px;
}

/* 表单样式 */
.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--bg-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

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

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 10px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group select {
    cursor: pointer;
}

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

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-primary);
    padding: 80px 0 30px;
    border-top: 1px solid var(--bg-border);
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-grid > * {
    min-width: 260px;
}

.footer-brand {
    flex: 2;
}

.footer-links {
    flex: 1;
}

.footer-brand p {
    color: var(--text-tertiary);
    margin: 20px 0;
    line-height: 1.7;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

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


.wechat-link {
    position: relative;
    overflow: visible !important;
    z-index: 10;
}

.wechat-qrcode {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    background: #fff;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
    z-index: 100;
}

.wechat-qrcode img {
    max-width: 200px;
    max-height: 200px;
    width: auto;
    height: auto;
    display: block;
}

.wechat-link:hover .wechat-qrcode {
    opacity: 1;
    visibility: visible;
}

.footer-links h4 {
    color: var(--text-primary);
    font-size: 1.25rem;
    margin-bottom: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
    line-height: 1.8;
}

.footer-links li {
    padding-left: 4px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-newsletter h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.footer-newsletter p {
    color: var(--text-tertiary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.newsletter-form {
    display: flex;
    gap: 10px;
}

.newsletter-form input {
    flex: 1;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.newsletter-form button {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 10px;
    color: #fff;
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.newsletter-form button:hover {
    transform: scale(1.05);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--bg-border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.footer-bottom a {
    color: var(--text-tertiary);
}

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

.beian-gongan {
    margin-top: 8px;
}

.beian-gongan a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.beian-gongan a:hover {
    color: var(--primary-blue);
}

.beian-gongan i {
    font-size: 1rem;
}

/* 公安备案样式 */
.beian-gongan {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
}

.beian-gongan img {
    width: 16px;
    height: 16px;
    vertical-align: middle;
}

.beian-gongan a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* ========================================
   返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-glow);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }

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

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

    .testimonials-slider {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        transform: translateX(100%);
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

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

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

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

    .hero-title {
        font-size: 2.5rem;
    }

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

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }

    .stat-number {
        font-size: 2.5rem;
    }

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

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

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

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

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

    .product-detail {
        grid-template-columns: 1fr;
    }

    .product-buttons {
        flex-direction: column;
    }

    .product-buttons .btn {
        width: 100%;
    }

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

    .gallery-item:first-child {
        grid-column: span 1;
    }

    .gallery-item:first-child img {
        height: 200px;
      cursor: pointer;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .service-card,
    .case-card,
    .team-card,
    .testimonial-card {
        padding: 30px 20px;
    }

    .contact-form {
        padding: 30px 20px;
    }
}

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

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

/* 滚动动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   主题切换按钮
   ======================================== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--bg-border);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-normal);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.theme-toggle:hover {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: #fff;
    transform: rotate(15deg);
}

.theme-toggle i {
    transition: transform var(--transition-normal);
}

.theme-toggle:hover i {
    transform: scale(1.1);
}

/* 隐藏日间/夜间图标 */
.theme-toggle .fa-sun {
    display: none;
}

.theme-toggle .fa-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .theme-toggle {
        position: absolute;
        right: 70px;
        top: 50%;
        transform: translateY(-50%);
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}