/* ==================== 全局变量与重置 ==================== */
:root {
    /* 电脑端高级感配色 */
    --desktop-bg: #0a0e27;
    --desktop-primary: #6366f1;
    --desktop-secondary: #8b5cf6;
    --desktop-text: #f8fafc;
    --desktop-card: #1e293b;
    --desktop-accent: #22d3ee;
    --desktop-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* 手机端深色配色（与电脑端统一风格） */
    --mobile-bg: #0f172a;
    --mobile-primary: #6366f1;
    --mobile-secondary: #8b5cf6;
    --mobile-text: #f1f5f9;
    --mobile-card: #1e293b;
    --mobile-accent: #22d3ee;
    --mobile-border: rgba(255, 255, 255, 0.08);
    --mobile-muted: rgba(241, 245, 249, 0.6);

    /* 通用 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--desktop-bg);
    color: var(--desktop-text);
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}
/* ==================== 3D背景容器 ==================== */
#three-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ==================== 手机端菜单按钮 ==================== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: var(--transition);
}

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

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

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

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--mobile-bg);
    border-bottom: 1px solid var(--mobile-border);
    padding: 1rem 0;
    transform: translateY(-10px);
    opacity: 0;
    transition: var(--transition);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-links {
    list-style: none;
}

.mobile-nav-links li {
    border-bottom: 1px solid var(--mobile-border);
}

.mobile-nav-links a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--mobile-text);
    font-weight: 500;
    transition: var(--transition);
}

.mobile-nav-links a:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--mobile-accent);
}

/* ==================== 全局基础布局（所有设备共用） ==================== */

/* 导航栏基础 */
.navbar {
    z-index: 1000;
    backdrop-filter: blur(20px);
}

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

.logo {
    font-weight: 800;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 英雄区基础 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    text-align: center;
}

.hero-content {
    max-width: var(--max-width);
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border-radius: 50px;
}

.hero-title {
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.title-line {
    display: block;
    font-weight: 900;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    color: rgba(248, 250, 252, 0.7);
    line-height: 1.8;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(2, 2fr);
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: rgba(30, 41, 59, 0.5);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    font-weight: 600;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

/* 关于我们基础 */
.about {
    padding: 8rem 0;
    position: relative;
}

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

.about-text h3 {
    font-weight: 700;
    background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-text p {
    color: rgba(248, 250, 252, 0.7);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

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

.stat-number {
    font-weight: 800;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: rgba(248, 250, 252, 0.6);
    font-size: 0.95rem;
}

.tech-card {
    background: var(--desktop-card);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
}

.tech-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tech-card-icon {
    font-size: 2rem;
}

.tech-card-title {
    font-size: 1.3rem;
    font-weight: 700;
}

.tech-card-body ul {
    list-style: none;
}

.tech-card-body li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: rgba(248, 250, 252, 0.7);
}

.tech-card-body li:last-child {
    border-bottom: none;
}

/* 服务介绍基础 */
.services {
    padding: 8rem 0;
    position: relative;
}

.section-title {
    text-align: center;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: rgba(248, 250, 252, 0.6);
    margin-bottom: 4rem;
}

.services-grid {
    display: grid;
    gap: 2rem;
}

.service-card {
    background: var(--desktop-card);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon svg {
    width: 30px;
    height: 30px;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-card p {
    color: rgba(248, 250, 252, 0.6);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: 0.5rem 0;
    color: rgba(248, 250, 252, 0.7);
    position: relative;
    padding-left: 1.5rem;
}

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

/* 核心优势基础 */
.advantage {
    padding: 8rem 0;
    position: relative;
}

.advantage-grid {
    display: grid;
    gap: 2rem;
}

.advantage-card {
    background: var(--desktop-card);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-number {
    position: absolute;
    top: -10px;
    right: 10px;
    font-size: 5rem;
    font-weight: 900;
    color: rgba(99, 102, 241, 0.1);
    line-height: 1;
}

.advantage-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.advantage-card p {
    color: rgba(248, 250, 252, 0.6);
    line-height: 1.7;
}

/* 成功案例基础 */
.cases {
    padding: 8rem 0;
    position: relative;
}

.cases-grid {
    display: grid;
    gap: 2rem;
}

.case-card {
    background: var(--desktop-card);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: var(--transition);
}

.case-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder {
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
}

.case-content {
    padding: 2rem;
}

.case-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

.case-content p {
    color: rgba(248, 250, 252, 0.6);
    line-height: 1.6;
}

/* 联系区域基础 */
.contact {
    padding: 8rem 0;
    position: relative;
    text-align: center;
}

.contact-desc {
    color: rgba(248, 250, 252, 0.7);
    margin-bottom: 3rem;
}

.qrcode-container {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

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

.qrcode-image {
    border-radius: 12px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    padding: 10px;
    background: white;
    transition: var(--transition);
}

.qrcode-text {
    margin-top: 1rem;
    color: rgba(248, 250, 252, 0.7);
}

/* 页脚基础 */
.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(248, 250, 252, 0.5);
}

.footer p {
    margin: 0.5rem 0;
}

.icp {
    font-size: 0.9rem;
}

.icp a {
    color: rgba(248, 250, 252, 0.5);
    text-decoration: none;
    transition: color 0.3s ease;
}

.icp a:hover {
    color: rgba(248, 250, 252, 0.8);
}

.police-record {
    font-size: 0.9rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.police-record a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(248, 250, 252, 0.5);
    text-decoration: none;
    transition: color 0.3s ease;
}

.police-record a:hover {
    color: rgba(248, 250, 252, 0.8);
}

.police-record-icon {
    width: 16px;
    height: 16px;
    vertical-align: middle;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-line {
    width: 2px;
    height: 40px;
    background: linear-gradient(to bottom, var(--desktop-accent), transparent);
    animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
    0% { opacity: 0; transform: translateY(-10px); }
    50% { opacity: 1; }
    100% { opacity: 0; transform: translateY(10px); }
}

/* ==================== 电脑端样式 (>=768px) ==================== */
@media (min-width: 768px) {
    /* 导航栏 */
    .navbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(10, 14, 39, 0.9);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding: 1rem 2rem;
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
    }
    .nav-container {
        max-width: var(--max-width);
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .logo {
        font-size: 1.8rem;
        font-weight: 800;
        background: linear-gradient(135deg, var(--desktop-primary), var(--desktop-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        letter-spacing: -0.5px;
    }

    .nav-links {
        display: flex;
        gap: 2.5rem;
        list-style: none;
    }

    .nav-links a {
        font-weight: 500;
        position: relative;
        transition: var(--transition);
        padding: 0.5rem 0;
    }

    .nav-links a::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 0;
        height: 2px;
        background: var(--desktop-accent);
        transition: var(--transition);
    }

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

    .nav-links a:hover {
        color: var(--desktop-accent);
    }

    /* 英雄区 */
    .hero {
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 8rem 2rem 4rem;
        position: relative;
    }

    .hero-content {
        max-width: var(--max-width);
        text-align: center;
        position: relative;
        z-index: 1;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.5rem 1.5rem;
        background: rgba(99, 102, 241, 0.1);
        border: 1px solid rgba(99, 102, 241, 0.2);
        border-radius: 50px;
        margin-bottom: 2rem;
        opacity: 0;
        transform: translateY(20px);
    }

    .badge-icon {
        font-size: 1.2rem;
    }

    .badge-text {
        font-size: 0.95rem;
        font-weight: 500;
        color: var(--desktop-accent);
    }

    .hero-title {
        margin-bottom: 1.5rem;
        overflow: hidden;
    }

    .title-line {
        display: block;
        font-size: 4.5rem;
        font-weight: 900;
        line-height: 1.1;
        background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        opacity: 0;
        transform: translateY(100%);
        letter-spacing: -1px;
    }

    .hero-desc {
        font-size: 1.4rem;
        color: rgba(248, 250, 252, 0.7);
        margin-bottom: 3rem;
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
        opacity: 0;
        line-height: 1.8;
    }

    .hero-features {
        display: flex;
        justify-content: center;
        gap: 2rem;
        margin-bottom: 3rem;
        opacity: 0;
    }

    .feature-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .feature-icon {
        font-size: 2rem;
    }

    .feature-text {
        font-size: 0.9rem;
        color: rgba(248, 250, 252, 0.6);
        font-weight: 500;
    }

    /* 联系按钮 */
    .contact-btn {
        display: inline-flex;
        align-items: center;
        gap: 1rem;
        padding: 1.2rem 3rem;
        background: var(--desktop-gradient);
        color: white;
        font-size: 1.1rem;
        font-weight: 600;
        border-radius: 50px;
        border: none;
        cursor: pointer;
        transition: var(--transition);
        box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
        opacity: 0;
        transform: scale(0.8);
    }

    .contact-btn:hover {
        transform: translateY(-3px) scale(1.05);
        box-shadow: 0 15px 40px rgba(99, 102, 241, 0.6);
    }

    .contact-btn svg {
        width: 24px;
        height: 24px;
    }

    /* 滚动指示器 */
    .scroll-indicator {
        position: absolute;
        bottom: 3rem;
        left: 50%;
        transform: translateX(-50%);
        opacity: 0;
    }

    .scroll-line {
        width: 2px;
        height: 60px;
        background: linear-gradient(to bottom, var(--desktop-accent), transparent);
        animation: scrollBounce 2s infinite;
    }

    @keyframes scrollBounce {
        0%, 100% { transform: translateY(0); opacity: 1; }
        50% { transform: translateY(20px); opacity: 0.5; }
    }

    /* 关于我们 */
    .about {
        padding: 8rem 0;
        position: relative;
    }

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

    .about-text h3 {
        font-size: 2rem;
        margin-bottom: 1.5rem;
        background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .about-text p {
        color: rgba(248, 250, 252, 0.7);
        margin-bottom: 1.5rem;
        line-height: 1.8;
    }

    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
        margin-top: 3rem;
    }

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

    .stat-number {
        font-size: 2.5rem;
        font-weight: 800;
        background: linear-gradient(135deg, var(--desktop-primary), var(--desktop-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        margin-bottom: 0.5rem;
    }

    .stat-label {
        font-size: 0.9rem;
        color: rgba(248, 250, 252, 0.6);
    }

    .tech-card {
        background: var(--desktop-card);
        border-radius: 20px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        padding: 2rem;
        transition: var(--transition);
    }

    .tech-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }

    .tech-card-header {
        display: flex;
        align-items: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
    }

    .tech-card-icon {
        font-size: 2rem;
    }

    .tech-card-title {
        font-size: 1.3rem;
        font-weight: 700;
    }

    .tech-card-body ul {
        list-style: none;
    }

    .tech-card-body li {
        padding: 0.8rem 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        color: rgba(248, 250, 252, 0.7);
    }

    .tech-card-body li:last-child {
        border-bottom: none;
    }

    /* 服务介绍 */
    .services {
        padding: 8rem 0;
        position: relative;
    }

    .section-title {
        text-align: center;
        font-size: 2.5rem;
        font-weight: 800;
        margin-bottom: 1rem;
        background: linear-gradient(135deg, var(--desktop-text), var(--desktop-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        opacity: 0;
    }

    .section-subtitle {
        text-align: center;
        font-size: 1.1rem;
        color: rgba(248, 250, 252, 0.6);
        margin-bottom: 4rem;
    }

    .services-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }

    .service-card {
        background: var(--desktop-card);
        padding: 2.5rem;
        border-radius: 20px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        transition: var(--transition);
        position: relative;
        overflow: hidden;
        opacity: 0;
        transform: translateY(50px);
    }

    .service-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--desktop-primary), var(--desktop-secondary));
        transform: scaleX(0);
        transition: var(--transition);
    }

    .service-card:hover {
        transform: translateY(-10px) scale(1.02);
        border-color: var(--desktop-accent);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }

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

    .service-icon {
        width: 60px;
        height: 60px;
        background: linear-gradient(135deg, var(--desktop-primary), var(--desktop-secondary));
        border-radius: 15px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.5rem;
    }

    .service-icon svg {
        width: 30px;
        height: 30px;
        color: white;
    }

    .service-card h3 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .service-card p {
        color: rgba(248, 250, 252, 0.6);
        line-height: 1.8;
        margin-bottom: 1.5rem;
    }

    .service-features {
        list-style: none;
    }

    .service-features li {
        padding: 0.5rem 0;
        padding-left: 1.5rem;
        position: relative;
        color: rgba(248, 250, 252, 0.5);
        font-size: 0.9rem;
    }

    .service-features li::before {
        content: "\2713";
        position: absolute;
        left: 0;
        color: var(--desktop-accent);
        font-weight: bold;
    }

    /* 核心优势 */
    .advantage {
        padding: 8rem 0;
        position: relative;
    }

    .advantage-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }

    .advantage-card {
        background: var(--desktop-card);
        padding: 2rem;
        border-radius: 20px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        text-align: center;
        transition: var(--transition);
        position: relative;
        overflow: hidden;
        opacity: 0;
        transform: translateY(50px);
    }

    .advantage-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }

    .advantage-number {
        position: absolute;
        top: 1rem;
        right: 1rem;
        font-size: 3rem;
        font-weight: 900;
        color: rgba(255, 255, 255, 0.05);
        line-height: 1;
    }

    .advantage-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }

    .advantage-card h3 {
        font-size: 1.3rem;
        margin-bottom: 0.8rem;
    }

    .advantage-card p {
        color: rgba(248, 250, 252, 0.6);
        line-height: 1.6;
        font-size: 0.95rem;
    }

    /* 成功案例 */
    .cases {
        padding: 8rem 0;
        position: relative;
    }

    .cases-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }

    .case-card {
        background: var(--desktop-card);
        border-radius: 20px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        overflow: hidden;
        transition: var(--transition);
        opacity: 0;
        transform: translateY(50px);
    }

    .case-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }

    .case-image {
        width: 100%;
        height: 200px;
        background: linear-gradient(135deg, var(--desktop-primary), var(--desktop-secondary));
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 3rem;
    }

    .case-content {
        padding: 2rem;
    }

    .case-content h3 {
        font-size: 1.3rem;
        margin-bottom: 0.8rem;
    }

    .case-content p {
        color: rgba(248, 250, 252, 0.6);
        line-height: 1.6;
        font-size: 0.95rem;
    }

    /* 联系区域 */
    .contact {
        padding: 8rem 0;
        position: relative;
        text-align: center;
    }

    .contact-desc {
        font-size: 1.2rem;
        color: rgba(248, 250, 252, 0.7);
        margin-bottom: 3rem;
    }

    .qrcode-container {
        display: flex;
        justify-content: center;
        gap: 3rem;
    }

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

    .qrcode-image {
        width: 200px;
        height: 200px;
        border-radius: 12px;
        border: 2px solid rgba(255, 255, 255, 0.1);
        padding: 10px;
        background: white;
        transition: var(--transition);
    }

    .qrcode-image:hover {
        transform: scale(1.05);
        border-color: var(--desktop-accent);
    }

    .qrcode-text {
        margin-top: 1rem;
        font-size: 1.1rem;
        color: rgba(248, 250, 252, 0.7);
    }

    /* 页脚 */
    .footer {
        text-align: center;
        padding: 2rem 2rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        color: rgba(248, 250, 252, 0.5);
    }

    .footer p {
        margin: 0.5rem 0;
    }

    .icp {
        font-size: 0.9rem;
    }

    .police-record {
        font-size: 0.9rem;
    }

    .police-record-icon {
        width: 16px;
        height: 16px;
    }

    /* 隐藏手机端元素 */
    .mobile-only {
        display: none !important;
    }
}

/* ==================== 手机端样式 (<768px) ==================== */
@media (max-width: 767px) {
    body {
        background: var(--mobile-bg);
        color: var(--mobile-text);
    }

    .container {
        padding: 0 1.5rem;
    }

    /* 手机端3D粒子背景保留，同时添加渐变装饰 */
    body::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background:
            radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
            radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
            radial-gradient(ellipse at 50% 50%, rgba(34, 211, 238, 0.05) 0%, transparent 70%);
        z-index: -1;
        pointer-events: none;
    }
    /* 导航栏 */
    .navbar {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(20px);
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--mobile-border);
    }

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

    .logo {
        font-size: 1.5rem;
        font-weight: 800;
        background: linear-gradient(135deg, var(--mobile-primary), var(--mobile-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
        color: var(--mobile-text);
    }

    .mobile-menu {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--mobile-border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        padding: 0 0;
    }

    .mobile-menu.active {
        max-height: 400px;
        padding: 0.5rem 0;
    }

    .mobile-nav-links a {
        display: block;
        padding: 1rem 1.5rem;
        color: var(--mobile-text);
        font-weight: 500;
        transition: var(--transition);
    }

    .mobile-nav-links a:active {
        background: rgba(99, 102, 241, 0.1);
    }

    /* 英雄区 */
    .hero {
        padding: 5rem 1.5rem 3rem;
        text-align: center;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .hero-content {
        width: 100%;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
        background: rgba(99, 102, 241, 0.15);
        border: 1px solid rgba(99, 102, 241, 0.2);
        border-radius: 50px;
        margin-bottom: 1.5rem;
    }

    .badge-icon {
        font-size: 1rem;
    }

    .badge-text {
        font-size: 0.85rem;
        font-weight: 500;
        color: var(--mobile-accent);
    }

    .hero-title {
        margin-bottom: 1rem;
    }

    .title-line {
        display: block;
        font-size: 2.2rem;
        font-weight: 800;
        line-height: 1.2;
        background: linear-gradient(135deg, var(--mobile-text), var(--mobile-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .hero-desc {
        font-size: 1rem;
        color: var(--mobile-muted);
        margin-bottom: 2rem;
        line-height: 1.6;
    }

    .hero-features {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        margin-bottom: 2rem;
    }

    .feature-icon {
        font-size: 1.5rem;
    }

    .feature-text {
        font-size: 0.85rem;
        color: var(--mobile-muted);
    }

    /* 联系按钮 */
    .contact-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.8rem;
        width: 100%;
        padding: 1.2rem;
        background: linear-gradient(135deg, var(--mobile-primary), var(--mobile-secondary));
        color: white;
        font-size: 1.1rem;
        font-weight: 600;
        border-radius: 12px;
        border: none;
        cursor: pointer;
        transition: var(--transition);
    }

    .contact-btn:active {
        transform: scale(0.98);
        opacity: 0.9;
    }

    .contact-btn svg {
        width: 22px;
        height: 22px;
    }

    /* 滚动指示器 */
    .scroll-indicator {
        display: none;
    }

    /* 关于我们 */
    .about {
        padding: 4rem 0;
    }

    .about-content {
        display: grid;
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-text h3 {
        font-size: 1.5rem;
        text-align: center;
        background: linear-gradient(135deg, var(--mobile-text), var(--mobile-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .about-text p {
        color: var(--mobile-muted);
        text-align: center;
    }

    .stats-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

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

    .stat-number {
        font-size: 2rem;
        background: linear-gradient(135deg, var(--mobile-primary), var(--mobile-secondary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .stat-label {
        color: var(--mobile-muted);
    }

    .tech-card {
        background: var(--mobile-card);
        border: 1px solid var(--mobile-border);
        border-radius: 16px;
        padding: 1.5rem;
    }

    .tech-card-icon {
        font-size: 1.5rem;
    }

    .tech-card-title {
        font-size: 1.1rem;
        color: var(--mobile-text);
    }

    .tech-card-body li {
        color: var(--mobile-muted);
        border-bottom-color: var(--mobile-border);
    }

    /* 服务介绍 */
    .services {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 1.8rem;
        text-align: center;
        background: linear-gradient(135deg, var(--mobile-text), var(--mobile-accent));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .section-subtitle {
        font-size: 1rem;
        text-align: center;
        color: var(--mobile-muted);
        margin-bottom: 2rem;
    }

    .services-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .service-card {
        background: var(--mobile-card);
        padding: 2rem;
        border-radius: 16px;
        border: 1px solid var(--mobile-border);
    }

    .service-icon {
        width: 50px;
        height: 50px;
        background: linear-gradient(135deg, var(--mobile-primary), var(--mobile-secondary));
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.2rem;
    }

    .service-icon svg {
        width: 26px;
        height: 26px;
        color: white;
    }

    .service-card h3 {
        font-size: 1.3rem;
        margin-bottom: 0.8rem;
        color: var(--mobile-text);
    }

    .service-card p {
        color: var(--mobile-muted);
        line-height: 1.7;
        font-size: 0.95rem;
    }

    .service-features li {
        color: var(--mobile-muted);
    }

    .service-features li::before {
        color: var(--mobile-accent);
    }

    /* 核心优势 */
    .advantage {
        padding: 4rem 0;
    }

    .advantage-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .advantage-card {
        background: var(--mobile-card);
        padding: 1.5rem;
        border-radius: 16px;
        border: 1px solid var(--mobile-border);
    }

    .advantage-number {
        color: rgba(99, 102, 241, 0.1);
    }

    .advantage-icon {
        font-size: 2rem;
    }

    .advantage-card h3 {
        font-size: 1.1rem;
        color: var(--mobile-text);
    }

    .advantage-card p {
        color: var(--mobile-muted);
        font-size: 0.9rem;
    }

    /* 成功案例 */
    .cases {
        padding: 4rem 0;
    }

    .cases-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .case-card {
        background: var(--mobile-card);
        border-radius: 16px;
        border: 1px solid var(--mobile-border);
    }

    .case-image {
        height: 150px;
        background: linear-gradient(135deg, var(--mobile-primary), var(--mobile-secondary));
        font-size: 2rem;
    }

    .case-content {
        padding: 1.5rem;
    }

    .case-content h3 {
        font-size: 1.2rem;
        color: var(--mobile-text);
    }

    .case-content p {
        color: var(--mobile-muted);
        font-size: 0.9rem;
    }

    /* 联系区域 */
    .contact {
        padding: 4rem 0;
        text-align: center;
    }

    .contact-desc {
        color: var(--mobile-muted);
        font-size: 1rem;
        text-align: center;
    }

    .qrcode-container {
        justify-content: center;
    }

    .qrcode-image {
        width: 180px;
        height: 180px;
        border-radius: 12px;
        border: 2px solid var(--mobile-border);
        padding: 8px;
        background: white;
    }

    .qrcode-text {
        color: var(--mobile-muted);
        font-size: 1rem;
    }

    /* 页脚 */
    .footer {
        padding: 2rem 1.5rem;
        border-top: 1px solid var(--mobile-border);
        color: rgba(241, 245, 249, 0.4);
        font-size: 0.9rem;
        text-align: center;
    }

    .police-record {
        font-size: 0.85rem;
    }

    .police-record-icon {
        width: 14px;
        height: 14px;
    }

    /* 隐藏电脑端元素 */
    .desktop-only {
        display: none !important;
    }
}