/* ===== 全局样式重置与基础设置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #333333;
    --light-gray: #f8f8f8;
    --medium-gray: #eaeaea;
    --dark-gray: #666666;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-hover: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.65;
    color: var(--primary-color);
    background-color: var(--secondary-color);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 布局组件 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
}

/* ===== 排版系统 ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-base);
    position: relative;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border: none;
    outline: none;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-hover);
    min-width: 160px;
    font-size: 1.05rem;
    margin: 0 var(--spacing-xs);
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-hover);
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--light-gray);
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-md);
}

/* ===== 顶部导航栏 ===== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.top-nav {
    z-index: 1000;
    transition: var(--transition-base);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 12px 0;
}

.top-nav.scrolled {
    padding: 8px 0;
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo{
    width: 60px;
    height: 60px;
}
.logo-container {
    transition: var(--transition-base);
}

.logo-container img {
    max-width: 100px;
    height: auto;
    transition: transform 0.3s ease;
}

.logo-container img:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    font-size: 1.05rem;
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: var(--transition-base);
}

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

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

.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    width: 32px;
    height: 24px;
    position: relative;
    z-index: 2;
}

.menu-icon, .menu-icon::before, .menu-icon::after {
    content: '';
    position: absolute;
    width: 32px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition-base);
}

.menu-icon {
    top: 50%;
    transform: translateY(-50%);
}

.menu-icon::before {
    top: -8px;
}

.menu-icon::after {
    bottom: -8px;
}

.mobile-menu-toggle.active .menu-icon {
    background-color: transparent;
}

.mobile-menu-toggle.active .menu-icon::before {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active .menu-icon::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* ===== 头部英雄区域 ===== */
.hero-section {
    padding: var(--spacing-xxl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    background-color: var(--light-gray);
    margin-top: 70px;
}

.hero-bg-shape {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(0, 0, 0, 0.03) 0%, transparent 70%);
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
    font-weight: 800;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 主要内容区域 ===== */
main {
    position: relative;
}

/* ===== 介绍部分 ===== */
.intro-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.intro-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
}

.intro-image {
    flex: 1;
    width: 300px;
}

.image-frame {
    width: 300px;
    margin: 0 auto;
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

.image-frame:hover {
    transform: rotate(0deg) scale(1.02);
}

.intro-visual {
    width: 300px;
    height: auto;
    display: block;
}

.intro-text {
    flex: 1;
    min-width: 300px;
    max-width: 600px;
}

.intro-title {
    position: relative;
    display: inline-block;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: bold;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.intro-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.intro-desc {
    font-size: clamp(1.1rem, 2vw, 1.2rem);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    color: var(--dark-gray);
    line-height: 1.8;
}

.intro-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 1rem;
    color: var(--dark-gray);
    font-weight: 500;
}

/* ===== 下载区域 ===== */
.download-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background-color: var(--light-gray);
    border-top: 1px solid var(--medium-gray);
    text-align: center;
    overflow: hidden;
}

.download-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.download-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
}

.download-info {
    flex: 1;
    min-width: 300px;
    text-align: left;
    max-width: 500px;
}

.download-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-md);
}

.download-desc {
    font-size: 1.1rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-lg);
}

.app-platforms {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.platform-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--primary-color);
    color: var(--secondary-color);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
}

.download-qrcodes {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

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

.qrcode-box {
    position: relative;
    background-color: var(--secondary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-hover);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
}

.qrcode-ribbon {
    position: absolute;
    top: -10px;
    right: -10px;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.qrcode-box:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.qrcode {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-md);
    border: 2px solid var(--primary-color);
    transition: transform 0.3s ease;
}

.qrcode:hover {
    transform: scale(1.05);
}

.qrcode-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    text-align: center;
}

/* ===== 功能特点区域 ===== */
.features-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-color);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-subtitle {
    display: inline-block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--primary-color);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--dark-gray);
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background-color: var(--secondary-color);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-hover);
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: var(--transition-base);
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: inline-block;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.2) rotate(5deg);
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-desc {
    font-size: 1.05rem;
    color: var(--dark-gray);
    line-height: 1.6;
}

.feature-divider {
    width: 40px;
    height: 3px;
    background-color: var(--primary-color);
    margin: var(--spacing-lg) auto;
    border-radius: 3px;
}

.feature-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ===== 用户评价区域 ===== */
.testimonials-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background-color: var(--light-gray);
    overflow: hidden;
}

.testimonials-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.testimonial-card {
    background-color: var(--secondary-color);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition-hover);
    box-shadow: var(--shadow-sm);
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.testimonial-quote {
    position: absolute;
    top: 10px;
    left: 15px;
    font-size: 5rem;
    color: rgba(0, 0, 0, 0.03);
    font-weight: 900;
    line-height: 1;
    z-index: 0;
}

.testimonial-text {
    font-size: 1.1rem;
    color: var(--dark-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    position: relative;
    z-index: 1;
    flex-grow: 1;
}

.author-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.author-avatar {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.testimonial-card:hover .author-avatar {
    transform: scale(1.1) rotate(5deg);
}

.author-details {
    flex: 1;
}

.author-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.author-rating {
    color: var(--primary-color);
    font-size: 1rem;
}

/* ===== 常见问题区域 ===== */
.faq-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background-color: var(--secondary-color);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--secondary-color);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-hover);
    position: relative;
    overflow: hidden;
}

.faq-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.faq-question {
    position: relative;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    padding-left: var(--spacing-lg);
}

.faq-question::before {
    content: 'Q';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    font-weight: bold;
    color: var(--primary-color);
    background-color: var(--light-gray);
    border: 2px solid var(--primary-color);
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition-base);
}

.faq-item:hover .faq-question::before {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

.faq-toggle {
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    transition: var(--transition-base);
}

.faq-toggle::before, .faq-toggle::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 14px;
    background-color: var(--primary-color);
    top: 50%;
    left: 50%;
    transition: var(--transition-base);
}

.faq-toggle::before {
    transform: translate(-50%, -50%);
}

.faq-toggle::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.active .faq-toggle::after {
    transform: translate(-50%, -50%) rotate(180deg);
    opacity: 0;
}

.faq-answer {
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: 1.05rem;
    color: var(--dark-gray);
    line-height: 1.7;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    opacity: 1;
}

.faq-answer::before {
    content: 'A';
    position: absolute;
    left: 0;
    top: 0;
    font-weight: bold;
    color: var(--primary-color);
    background-color: var(--light-gray);
    border: 2px solid var(--primary-color);
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

/* ===== 联系客服区域 ===== */
.contact-section {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background-color: var(--light-gray);
}

.contact-content {
    position: relative;
    padding: var(--spacing-xl);
    background-color: var(--secondary-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
    align-items: center;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--light-gray);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.contact-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-text {
    flex: 1;
}

.contact-label {
    display: block;
    font-size: 0.9rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.contact-qrcode {
    flex: 1;
    min-width: 200px;
    text-align: center;
}

.kefu-qrcode {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-md);
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.kefu-qrcode:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* ===== 页脚区域 ===== */
footer {
    position: relative;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--secondary-color), transparent);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    flex: 1;
    min-width: 250px;
}

.footer-logo {
    max-width: 150px;
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-base);
}

.social-link:hover {
    color: var(--secondary-color);
    transform: translateY(-2px);
}

.footer-links {
    flex: 1;
    min-width: 200px;
}

.footer-heading {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary-color);
}

.footer-links a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

.footer-download {
    flex: 1;
    min-width: 200px;
}

.footer-qrcode {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.small-qrcode {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    border: 2px solid var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.copyright {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

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

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

/* ===== 动画效果 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ===== 动画类 ===== */
.animate-fadeIn {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.animate-slideInLeft {
    opacity: 0;
    animation: slideInLeft 0.8s ease forwards;
}

.animate-slideInRight {
    opacity: 0;
    animation: slideInRight 0.8s ease forwards;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .features-grid, .testimonials-grid {
        gap: var(--spacing-md);
    }
    
    .intro-content, .download-content {
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 36px;
        --spacing-xxl: 48px;
    }
    
    /* 联系我们区域移动端优化 */
    .contact-content {
        padding: 10px;
        gap: var(--spacing-lg);
    }
    
    .contact-item {
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .kefu-qrcode {
        width: 180px;
        height: 180px;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background-color: var(--secondary-color);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-lg);
        transition: var(--transition-base);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 1;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .intro-image, .intro-text, .download-info, .download-qrcodes, .contact-info, .contact-qrcode {
        flex: 100%;
    }
    
    .intro-content, .download-content, .contact-content {
        text-align: center;
    }
    
    .intro-stats {
        gap: var(--spacing-md);
    }
    
    .footer-content {
        justify-content: center;
        text-align: center;
    }
    
    .footer-heading::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .feature-badge {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        font-size: 0.8rem;
        padding: 4px 8px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 24px;
        --spacing-xl: 32px;
        --spacing-xxl: 40px;
    }
    
    /* 联系我们区域小屏移动端优化 */
    .contact-content {
        padding: 10px;
        gap: var(--spacing-md);
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .contact-icon {
        margin-bottom: var(--spacing-xs);
    }
    
    .kefu-qrcode {
        width: 150px;
        height: 150px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .btn {
        min-width: 140px;
        padding: 12px 24px;
        font-size: 1rem;
    }
    
    .feature-card, .testimonial-card, .faq-item {
        padding: var(--spacing-md);
    }
    
    .feature-icon {
        font-size: 2rem;
    }
    
    .qrcode {
        width: 150px;
        height: 150px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* ===== 打印样式 ===== */
@media print {
    body {
        background-color: white;
        color: black;
    }
    
    .top-nav, .btn, .download-section, .contact-section, .social-links {
        display: none;
    }
    
    footer {
        background-color: white;
        color: black;
        border-top: 1px solid black;
    }
    
    .footer-links a {
        color: black;
    }
}

/* ===== 无障碍支持 ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===== 高对比度模式支持 ===== */
@media (prefers-contrast: high) {
    body {
        color: #000;
        background-color: #fff;
    }
    
    .feature-card, .testimonial-card, .faq-item {
        border: 2px solid #000;
    }
    
    .btn-secondary {
        border-width: 3px;
    }
}