/* WEEX唯客交易所 - 专业CSS样式文件 */

/* ==================== 基础配置 ==================== */
:root {
    /* 主色调 - 蓝色系（专业金融色调） */
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --primary-light: #42a5f5;
    
    /* 辅助色 - 金色/橙色（代表财富和活力） */
    --accent-color: #ffa726;
    --accent-dark: #f57c00;
    --accent-light: #ffb74d;
    
    /* 功能色 */
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    
    /* 背景色 */
    --bg-color: #ffffff;
    --bg-secondary: #f5f7fa;
    --bg-dark: #0d1f3c;
    --bg-gradient: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%);
    
    /* 文字色 */
    --text-color: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-white: #ffffff;
    
    /* 边框色 */
    --border-color: #e0e0e0;
    --border-light: #f0f0f0;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.20);
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* 字体大小 */
    --font-xs: 12px;
    --font-sm: 14px;
    --font-md: 16px;
    --font-lg: 18px;
    --font-xl: 20px;
    --font-xxl: 24px;
    --font-xxxl: 32px;
    --font-hero: 48px;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 过渡时间 */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
    
    /* 响应式断点 */
    --breakpoint-xs: 480px;
    --breakpoint-sm: 768px;
    --breakpoint-md: 992px;
    --breakpoint-lg: 1200px;
    --breakpoint-xl: 1440px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==================== 响应式工具类 ==================== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ==================== 通用组件 ==================== */
/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    outline: none;
}

.btn:focus {
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.3);
}

.btn-primary {
    background: var(--bg-gradient);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

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

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xxl);
    font-size: var(--font-lg);
}

/* Section Header */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-header h2 {
    font-size: var(--font-xxxl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--bg-gradient);
    border-radius: var(--radius-full);
}

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

@media (max-width: 768px) {
    .section-header h2 {
        font-size: var(--font-xxl);
    }
    
    .section-header p {
        font-size: var(--font-md);
    }
}

/* ==================== 导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    height: 70px;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-brand a {
    display: block;
}

.nav-brand img {
    height: 40px;
    width: auto;
    display: block;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    position: relative;
    transition: var(--transition-normal);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    left: 0;
    transition: var(--transition-normal);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-size: var(--font-md);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-menu a:not(.btn):hover {
    color: var(--primary-color);
    background: rgba(30, 136, 229, 0.1);
}

.nav-menu a:not(.btn)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--spacing-md);
    right: var(--spacing-md);
    height: 2px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.nav-menu a:not(.btn):hover::after {
    transform: scaleX(1);
}

/* 响应式导航 */
@media (max-width: 992px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-color);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu a {
        display: block;
        padding: var(--spacing-md);
        width: 100%;
    }
    
    .nav-menu .btn {
        width: 100%;
        margin-top: var(--spacing-md);
    }
}

/* ==================== Hero主视觉区 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a3a5c 50%, var(--primary-dark) 100%);
    overflow: hidden;
    padding-top: 70px;
}

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

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://picsum.photos/seed/particles/1920/1080') center center;
    opacity: 0.05;
    animation: particleFloat 20s ease-in-out infinite;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-30px) scale(1.1);
    }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.hero-title-main {
    display: block;
    font-size: var(--font-hero);
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.hero-title-sub {
    display: block;
    font-size: var(--font-xxl);
    font-weight: 600;
    color: var(--primary-light);
}

.hero-description {
    font-size: var(--font-lg);
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    max-width: 560px;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(5px);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: var(--font-xxl);
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.7);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-image {
    animation: fadeInRight 0.8s ease-out 0.3s backwards;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* 响应式Hero */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: var(--spacing-xxl);
        padding-bottom: var(--spacing-xxl);
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-image {
        order: 2;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-stats {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-actions {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding-top: 100px;
        padding-bottom: var(--spacing-xxl);
    }
    
    .hero-title-main {
        font-size: var(--font-xxxl);
    }
    
    .hero-title-sub {
        font-size: var(--font-xl);
    }
    
    .hero-description {
        font-size: var(--font-md);
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
    
    .stat-item {
        padding: var(--spacing-md);
    }
    
    .stat-number {
        font-size: var(--font-xl);
    }
}

/* ==================== 核心特性区 ==================== */
.features {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    animation: fadeInUp 0.6s ease-out backwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.feature-icon img {
    width: 50px;
    height: 50px;
    filter: brightness(0) invert(1);
}

.feature-card h3 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    font-size: var(--font-md);
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .features {
        padding: var(--spacing-xl) 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
}

/* ==================== 服务介绍区 ==================== */
.services {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-color);
}

.services-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
}

.service-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    animation: fadeInUp 0.8s ease-out backwards;
}

.service-item:nth-child(1) { animation-delay: 0.1s; }
.service-item:nth-child(2) { animation-delay: 0.3s; }
.service-item:nth-child(3) { animation-delay: 0.5s; }

.service-item-reverse {
    direction: rtl;
}

.service-item-reverse > * {
    direction: ltr;
}

.service-content {
    position: relative;
}

.service-number {
    display: inline-block;
    font-size: var(--font-xxxl);
    font-weight: 800;
    color: var(--primary-light);
    opacity: 0.3;
    margin-bottom: var(--spacing-md);
}

.service-content h3 {
    font-size: var(--font-xxl);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
}

.service-content > p {
    font-size: var(--font-md);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.service-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.service-features li {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-md);
    color: var(--text-color);
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
}

.service-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.service-image img:hover {
    box-shadow: var(--shadow-xl);
    transform: scale(1.02);
}

@media (max-width: 992px) {
    .service-item,
    .service-item-reverse {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .service-item-reverse {
        direction: ltr;
    }
    
    .service-image {
        order: -1;
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .services {
        padding: var(--spacing-xl) 0;
    }
    
    .services-list {
        gap: var(--spacing-xl);
    }
}

/* ==================== 安全保障区 ==================== */
.security {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #e8f4f8 100%);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.security-card {
    background: var(--bg-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.6s ease-out backwards;
}

.security-card:nth-child(1) { animation-delay: 0.1s; }
.security-card:nth-child(2) { animation-delay: 0.15s; }
.security-card:nth-child(3) { animation-delay: 0.2s; }
.security-card:nth-child(4) { animation-delay: 0.25s; }
.security-card:nth-child(5) { animation-delay: 0.3s; }
.security-card:nth-child(6) { animation-delay: 0.35s; }

.security-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
    background: linear-gradient(135deg, var(--bg-color) 0%, #f0f7ff 100%);
}

.security-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gradient);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.security-card:hover .security-icon {
    transform: scale(1.05) rotate(5deg);
}

.security-icon img {
    width: 60px;
    height: 60px;
    filter: brightness(0) invert(1);
}

.security-card h3 {
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
}

.security-card p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 992px) {
    .security-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .security {
        padding: var(--spacing-xl) 0;
    }
    
    .security-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .security-card {
        padding: var(--spacing-lg);
    }
    
    .security-icon {
        width: 80px;
        height: 80px;
    }
    
    .security-icon img {
        width: 50px;
        height: 50px;
    }
}

/* ==================== 平台数据区 ==================== */
.stats {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-dark);
    color: var(--text-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.6s ease-out backwards;
    backdrop-filter: blur(5px);
}

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.2s; }
.stat-card:nth-child(3) { animation-delay: 0.3s; }
.stat-card:nth-child(4) { animation-delay: 0.4s; }

.stat-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon img {
    width: 50px;
    height: 50px;
    filter: brightness(0) invert(1);
}

.stat-info {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: var(--font-xxxl);
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
}

.stat-unit {
    font-size: var(--font-xl);
    font-weight: 600;
    color: var(--accent-light);
    margin-left: var(--spacing-xs);
}

.stat-desc {
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.7);
}

@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .stats {
        padding: var(--spacing-xl) 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .stat-card {
        padding: var(--spacing-lg);
    }
    
    .stat-value {
        font-size: var(--font-xxl);
    }
}

/* ==================== 常见问题区 ==================== */
.faq {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

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

.faq-item {
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.6s ease-out backwards;
}

.faq-item:nth-child(1) { animation-delay: 0.1s; }
.faq-item:nth-child(2) { animation-delay: 0.15s; }
.faq-item:nth-child(3) { animation-delay: 0.2s; }
.faq-item:nth-child(4) { animation-delay: 0.25s; }
.faq-item:nth-child(5) { animation-delay: 0.3s; }
.faq-item:nth-child(6) { animation-delay: 0.35s; }

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    margin: 0;
}

.faq-question button {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    font-size: var(--font-md);
    font-weight: 600;
    color: var(--text-color);
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-fast);
}

.faq-question button::after {
    content: '+';
    font-size: var(--font-xl);
    font-weight: 300;
    color: var(--primary-color);
    transition: all var(--transition-fast);
}

.faq-question button:hover {
    color: var(--primary-color);
    background: rgba(30, 136, 229, 0.05);
}

.faq-question button[aria-expanded="true"]::after {
    content: '−';
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.faq-answer p {
    padding: var(--spacing-lg);
    font-size: var(--font-md);
    color: var(--text-secondary);
    line-height: 1.7;
    border-top: 1px solid var(--border-light);
}

@media (max-width: 768px) {
    .faq {
        padding: var(--spacing-xl) 0;
    }
    
    .faq-question button {
        padding: var(--spacing-md);
        font-size: var(--font-sm);
    }
    
    .faq-answer p {
        padding: var(--spacing-md);
        font-size: var(--font-sm);
    }
}

/* ==================== 行动号召区 ==================== */
.cta {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-gradient);
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 167, 38, 0.1) 0%, transparent 70%);
    animation: ctaGlow 10s ease-in-out infinite;
}

@keyframes ctaGlow {
    0%, 100% {
        transform: scale(1) rotate(0deg);
    }
    50% {
        transform: scale(1.2) rotate(180deg);
    }
}

.cta-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out;
}

.cta-content h2 {
    font-size: var(--font-xxxl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-content > p {
    font-size: var(--font-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.cta-benefits {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.cta-benefits li {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    font-size: var(--font-md);
}

.cta-benefits li::before {
    content: '✓';
    color: var(--accent-color);
    margin-right: var(--spacing-sm);
    font-weight: 700;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.cta-note {
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.7);
}

.cta-note a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.cta-note a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .cta {
        padding: var(--spacing-xl) 0;
    }
    
    .cta-content h2 {
        font-size: var(--font-xxl);
    }
    
    .cta-benefits {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-actions .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xxl);
}

.footer-brand {
    max-width: 300px;
}

.footer-brand img {
    height: 40px;
    width: auto;
    margin-bottom: var(--spacing-lg);
}

.footer-brand > p {
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-social img {
    width: 18px;
    height: 18px;
    filter: brightness(0) invert(1);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: var(--font-md);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
}

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

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-sm);
    transition: all var(--transition-fast);
}

.footer-column a:hover {
    color: var(--primary-light);
    padding-left: var(--spacing-sm);
}

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

.footer-bottom p {
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-brand {
        max-width: 100%;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .footer {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-column {
        text-align: center;
    }
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--bg-gradient);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
}

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

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

.back-to-top svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 平滑滚动 */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==================== 图片优化 ==================== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 图片加载过渡 */
img[src] {
    opacity: 1;
    transition: opacity var(--transition-normal);
}

/* ==================== 打印样式 ==================== */
@media print {
    .header,
    .back-to-top,
    .nav-toggle {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-lg);
    }
    
    .section-header h2::after {
        display: none;
    }
}

/* ==================== 无障碍优化 ==================== */
/* 焦点样式 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --text-color: #000000;
        --text-secondary: #333333;
        --border-color: #000000;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* ==================== 性能优化 ==================== */
/* GPU加速 */
.feature-card,
.security-card,
.stat-card,
.service-image img {
    will-change: transform;
}

/* 减少重绘 */
.container,
.nav-menu,
.features-grid {
    contain: layout;
}