/* ============================================
   比特币中文介绍平台 - 全局样式表
   ============================================ */

/* 全局CSS变量 */
:root {
    --primary-color: #F7931A;
    --primary-dark: #E8820F;
    --secondary-color: #1F2937;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --background-light: #F9FAFB;
    --background-white: #FFFFFF;
    --border-color: #E5E7EB;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   重置与基础样式
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-white);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-dark);
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-2xl);
}

/* ============================================
   导航栏样式
   ============================================ */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--background-white);
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    flex-shrink: 0;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 5px 0;
    transition: all var(--transition-fast);
    border-radius: 2px;
}

/* ============================================
   Hero 首屏
   ============================================ */

.hero {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--background-light) 0%, var(--background-white) 100%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
    margin: 0;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-light);
    margin: 0;
    line-height: 1.5;
}

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

.btn {
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: inline-block;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.hero-image {
    position: relative;
}

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

/* Hero新元素样式 */
.hero-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.hero-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
    padding: 0;
}

.hero-features li {
    font-size: 15px;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    padding-left: 0;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.stat-item {
    flex: 1;
    text-align: center;
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* ============================================
   通用Section样式
   ============================================ */

.section {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-white);
}

.section:nth-child(even) {
    background-color: var(--background-light);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin: 0 0 8px 0;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-light);
    text-align: center;
    margin: 0 0 var(--spacing-xl) 0;
}

/* ============================================
   比特币是什么 - Features Grid
   ============================================ */

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

.feature-card {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md) auto;
    background-color: var(--background-light);
    border-radius: 50%;
    color: var(--primary-color);
}

.feature-icon svg {
    width: 60px;
    height: 60px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.feature-card p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   比特币如何运作 - Timeline
   ============================================ */

.process-timeline {
    margin: var(--spacing-xl) 0;
    position: relative;
}

.timeline-item {
    display: flex;
    gap: var(--spacing-lg);
    position: relative;
    padding: var(--spacing-lg) 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    width: 12px;
    height: 12px;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary-color);
    z-index: 1;
}

.timeline-content {
    margin-left: 60px;
    padding-bottom: var(--spacing-lg);
}

.timeline-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.timeline-content p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

.timeline-divider {
    position: absolute;
    left: 26px;
    top: 52px;
    width: 2px;
    height: var(--spacing-xl);
    background-color: var(--primary-color);
}

.timeline-item:last-child .timeline-divider {
    display: none;
}

.tech-image {
    margin-top: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.tech-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   使用指南 - Guide Cards
   ============================================ */

.guide-cards {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.guide-card {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--primary-color);
}

.guide-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.guide-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    background-color: var(--background-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.guide-icon svg {
    width: 36px;
    height: 36px;
}

.guide-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.guide-card p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   钱包与安全 - Security Grid
   ============================================ */

.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.security-item {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.security-item:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.security-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.security-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.security-item p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
    font-size: 14px;
}

/* 安全高亮框 */
.security-highlight {
    background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-2xl);
}

.security-highlight h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.security-tips {
    list-style: none;
    margin: 0;
    padding: 0;
}

.security-tips li {
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-sm) 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.security-tips li::before {
    content: '⚠️ ';
    margin-right: var(--spacing-sm);
    font-weight: 600;
}

/* ============================================
   应用场景 - Application Grid
   ============================================ */

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

.app-card {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

.app-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.app-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.app-card p {
    margin: 0;
    color: var(--text-light);
    line-height: 1.6;
    font-size: 14px;
}

/* ============================================
   FAQ - 常见问题
   ============================================ */

.faq-container {
    margin-top: var(--spacing-xl);
}

.faq-item {
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: white;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background-color: var(--background-light);
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    transition: all var(--transition-fast);
}

.faq-question:hover {
    background-color: #E8E8E8;
}

.faq-toggle {
    font-size: 20px;
    transition: transform var(--transition-normal);
    display: inline-block;
}

.faq-item.active .faq-question {
    background-color: var(--primary-color);
    color: white;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
    color: white;
}

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

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

.faq-answer p {
    padding: var(--spacing-lg);
    margin: 0;
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   平台声明
   ============================================ */

.platform-notice {
    background-color: #F5F5F5;
}

.notice-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.notice-item {
    background-color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.notice-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.notice-item p {
    margin: 0;
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* ============================================
   联系我们
   ============================================ */

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.contact-item {
    background-color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.contact-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.contact-item p {
    margin: 0;
    font-size: 16px;
}

.contact-item a {
    color: var(--primary-color);
    font-weight: 600;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* ============================================
   页脚
   ============================================ */

.footer {
    background-color: #1a1a1a;
    color: #d4d4d4;
    padding: var(--spacing-2xl) 0 var(--spacing-xl) 0;
    border-top: 1px solid #333;
}

/* 页脚 Header - Logo 和社交媒体 */
.footer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid #333;
}

.footer-logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 4px;
}

.footer-logo-section h3 {
    font-size: 18px;
    font-weight: 700;
    color: white;
    margin: 0;
    line-height: 1.2;
}

.footer-logo-section p {
    font-size: 13px;
    color: #999;
    margin: 4px 0 0 0;
}

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

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #333;
    color: white;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 页脚内容网格 */
.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-section h4 {
    font-size: 15px;
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
    color: white;
    text-transform: capitalize;
    letter-spacing: 0.5px;
}

.footer-section ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-section li {
    margin: 0;
    line-height: 2;
}

.footer-section a {
    color: #999;
    font-size: 13px;
    transition: color var(--transition-fast);
    text-decoration: none;
}

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

/* 页脚底部信息 */
.footer-bottom {
    border-top: 1px solid #333;
    padding-top: var(--spacing-lg);
}

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

.footer-disclaimer h4 {
    font-size: 14px;
    font-weight: 700;
    color: #f59e0b;
    margin: 0 0 var(--spacing-md) 0;
}

.footer-disclaimer p {
    font-size: 12px;
    color: #999;
    margin: 6px 0;
    line-height: 1.6;
}

.footer-disclaimer strong {
    color: #d4d4d4;
}

.footer-security-badge h4 {
    font-size: 14px;
    font-weight: 700;
    color: #10b981;
    margin: 0 0 var(--spacing-md) 0;
}

.footer-security-badge ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-security-badge li {
    font-size: 12px;
    color: #999;
    margin: 6px 0;
    line-height: 1.6;
}

.footer-bottom-end {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #333;
    font-size: 12px;
    color: #666;
}

.footer-bottom-end p {
    margin: 6px 0;
}

/* ============================================
   返回顶部按钮
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    z-index: 999;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

.back-to-top.show {
    display: flex;
}

/* ============================================
   响应式设计 - 平板
   ============================================ */

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-xl);
    }

    .features-grid,
    .guide-cards,
    .application-grid,
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

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

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

    .hero {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: var(--spacing-xl) 0;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }


    .feature-card,
    .guide-card,
    .security-item,
    .app-card {
        padding: var(--spacing-lg);
    }
}

/* ============================================
   响应式设计 - 手机
   ============================================ */

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: white;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
    }

    .nav-menu.active {
        max-height: 500px;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero .container {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: var(--spacing-xl) !important;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

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

    .btn {
        width: 100%;
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .section-title {
        font-size: 24px;
    }

    .section-subtitle {
        font-size: 14px;
    }

    .features-grid,
    .guide-cards,
    .security-grid,
    .application-grid,
    .notice-content,
    .contact-info,
    .market-cards {
        grid-template-columns: 1fr;
    }

    .section-banner,
    .step-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        margin-bottom: var(--spacing-xl);
    }

    .section-banner .banner-text h3,
    .step-row .step-text h3 {
        font-size: 20px;
    }

    .step-row[style*="direction: rtl"] .step-img {
        order: -1;
    }

    .market-card-img {
        height: 180px;
    }

    .market-card-img img {
        max-height: 180px;
    }

    .timeline-item {
        margin-left: 0;
    }

    .timeline-item::before {
        left: -12px;
    }

    .timeline-content {
        margin-left: 30px;
    }

    .timeline-divider {
        left: -6px;
    }

    .faq-container {
        padding: 0;
    }

    .faq-question {
        font-size: 14px;
        padding: var(--spacing-md);
    }

    .faq-answer p {
        padding: var(--spacing-md);
        font-size: 14px;
    }

    .feature-card,
    .guide-card,
    .security-item,
    .app-card,
    .notice-item,
    .contact-item {
        padding: var(--spacing-md);
    }

    .feature-card h3,
    .guide-card h3,
    .security-item h3,
    .app-card h3,
    .notice-item h3,
    .contact-item h3 {
        font-size: 16px;
    }

    .feature-card p,
    .guide-card p,
    .security-item p,
    .app-card p,
    .notice-item p,
    .contact-item p {
        font-size: 13px;
    }

    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }

    .footer-section h4 {
        font-size: 14px;
    }

    .footer-section a {
        font-size: 12px;
    }

    .wallet-featured-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-lg);
    }

    .wallet-featured-card {
        padding: var(--spacing-lg);
    }

    .wallet-featured-card h3 {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    /* 导航栏 - 最小化高度 */
    .navbar {
        position: sticky;
        top: 0;
        z-index: 1000;
        background-color: var(--background-white);
        box-shadow: 0 1px 2px rgba(0,0,0,0.05);
        height: 44px;
    }

    .nav-wrapper {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 4px 12px !important;
        height: 44px;
    }

    .logo {
        display: flex;
        align-items: center;
        gap: 6px;
        flex-shrink: 0;
        height: 36px;
    }

    .logo-text {
        font-size: 15px;
        font-weight: 700;
        color: var(--primary-color);
        margin: 0;
        line-height: 36px;
    }

    .logo-img {
        width: 32px;
        height: 32px;
        flex-shrink: 0;
    }

    .nav-menu {
        position: absolute;
        top: 44px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: white;
        padding: 0;
        gap: 0;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        max-height: 0;
        overflow: hidden;
        visibility: hidden;
        transition: max-height var(--transition-normal), visibility var(--transition-normal);
        z-index: 999;
    }

    .nav-menu.active {
        max-height: 500px;
        visibility: visible;
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 13px;
        color: var(--text-dark);
        padding: 8px 0;
    }

    .hamburger {
        display: flex;
        flex-direction: column;
        cursor: pointer;
        padding: 4px;
        gap: 3px;
        background: none;
        border: none;
    }

    .hamburger span {
        width: 22px;
        height: 2px;
        background-color: var(--text-dark);
        border-radius: 1px;
        transition: all var(--transition-fast);
    }

    /* Hero 首屏 */
    .hero {
        padding: var(--spacing-lg) 0 !important;
        margin-top: 0 !important;
        background: linear-gradient(135deg, var(--background-light) 0%, var(--background-white) 100%);
    }

    .hero .container {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: var(--spacing-lg) !important;
    }

    .hero-content {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
        order: 1;
    }

    .hero-image {
        order: 2;
    }

    .hero-badge {
        display: inline-block;
        font-size: 10px;
        padding: 4px 10px;
        margin-bottom: 6px;
    }

    .hero-title {
        font-size: 22px;
        font-weight: 700;
        line-height: 1.25;
        color: var(--text-dark);
        margin: 0;
    }

    .hero-subtitle {
        font-size: 13px;
        color: var(--text-light);
        margin: 0;
        line-height: 1.5;
    }

    .hero-features {
        list-style: none;
        margin: 8px 0;
        padding: 0;
    }

    .hero-features li {
        font-size: 12px;
        color: var(--text-dark);
        margin-bottom: 6px;
        line-height: 1.4;
    }

    .hero-buttons {
        display: flex;
        gap: 8px;
        flex-wrap: wrap;
        margin: 8px 0;
    }

    .btn {
        flex: 1;
        min-width: 120px;
        padding: 11px 16px;
        font-size: 13px;
        font-weight: 600;
        border-radius: 8px;
    }

    .btn-primary {
        background-color: var(--primary-color);
        color: white;
    }

    .btn-secondary {
        background-color: transparent;
        color: var(--primary-color);
        border: 1.5px solid var(--primary-color);
    }

    .hero-stats {
        display: flex;
        flex-direction: column;
        gap: 8px;
        margin-top: 8px;
        padding-top: 8px;
        border-top: 1px solid var(--border-color);
    }

    .stat-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .stat-number {
        font-size: 16px;
        font-weight: 700;
        color: var(--primary-color);
    }

    .stat-label {
        font-size: 11px;
        color: var(--text-light);
        text-transform: uppercase;
        letter-spacing: 0.3px;
    }

    .hero-image img {
        width: 100%;
        height: auto;
        border-radius: 8px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    }

    /* 板块标题 */
    .section {
        padding: 20px 0 !important;
    }

    .section-title {
        font-size: 18px;
        font-weight: 700;
        color: var(--text-dark);
        text-align: center;
        margin: 0 0 4px 0 !important;
    }

    .section-subtitle {
        font-size: 13px;
        color: var(--text-light);
        text-align: center;
        margin: 0 0 16px 0 !important;
        line-height: 1.5;
    }

    /* 所有网格强制单列 */
    .features-grid,
    .guide-cards,
    .security-grid,
    .application-grid,
    .market-cards,
    .notice-content,
    .contact-info,
    .wallet-featured-grid,
    .footer-content {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    /* 图文横幅和步骤 */
    .section-banner,
    .step-row {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-lg) !important;
    }

    .section-banner .banner-img,
    .section-banner .banner-text,
    .step-row .step-img,
    .step-row .step-text {
        width: 100%;
    }

    .section-banner .banner-text h3,
    .step-row .step-text h3 {
        font-size: 18px;
        margin-bottom: 12px;
    }

    .section-banner .banner-text p,
    .step-row .step-text p {
        font-size: 14px;
        line-height: 1.6;
    }

    /* 卡片样式 - 最小化 */
    .feature-card,
    .guide-card,
    .security-item,
    .app-card,
    .market-card,
    .wallet-featured-card,
    .notice-item,
    .contact-item {
        padding: 14px 12px !important;
        border-radius: 8px !important;
    }

    .feature-card {
        background-color: white;
        border: 1px solid var(--border-color);
        box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    .feature-card h3,
    .guide-card h3,
    .security-item h3,
    .app-card h3,
    .market-card-body h3,
    .wallet-featured-card h3,
    .notice-item h3,
    .contact-item h3 {
        font-size: 15px;
        font-weight: 600;
        color: var(--text-dark);
        margin: 0 0 8px 0 !important;
    }

    .feature-card p,
    .guide-card p,
    .security-item p,
    .app-card p,
    .market-card-body p,
    .wallet-featured-card p,
    .notice-item p,
    .contact-item p {
        font-size: 12px;
        color: var(--text-light);
        line-height: 1.4;
        margin: 0 !important;
    }

    .feature-icon {
        width: 50px;
        height: 50px;
        margin: 0 auto 8px;
        background-color: var(--background-light);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .feature-icon svg {
        width: 30px;
        height: 30px;
    }

    /* 钱包卡片优化 */
    .wallet-featured-card {
        padding: 12px 12px !important;
        position: relative;
    }

    .wallet-icon {
        font-size: 36px;
        margin-bottom: 8px;
    }

    .wallet-featured-card h3 {
        font-size: 15px;
        font-weight: 700;
        color: var(--text-dark);
        margin: 0 0 2px 0;
    }

    .wallet-featured-card > p {
        font-size: 11px;
        color: var(--primary-color);
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.3px;
        margin: 0 0 10px 0;
    }

    .wallet-features {
        list-style: none;
        margin: 0 0 10px 0;
        padding: 0;
        font-size: 12px;
        color: var(--text-dark);
    }

    .wallet-features li {
        margin: 4px 0;
        line-height: 1.3;
    }

    .wallet-badges {
        display: flex;
        flex-wrap: wrap;
        gap: 4px;
        margin-bottom: 10px;
    }

    .wallet-badges .badge {
        display: inline-block;
        background: linear-gradient(135deg, #E3F2FD 0%, #F3E5F5 100%);
        color: #1565C0;
        padding: 3px 8px;
        border-radius: 10px;
        font-size: 10px;
        font-weight: 600;
        border: 0.5px solid #90CAF9;
        white-space: nowrap;
    }

    .wallet-badge {
        position: absolute;
        top: 8px;
        right: 8px;
        background: var(--primary-color);
        color: white;
        padding: 3px 8px;
        border-radius: 12px;
        font-size: 10px;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.2px;
    }

    .wallet-cta {
        display: block;
        width: 100%;
        background: var(--primary-color);
        color: white;
        padding: 10px 12px;
        border-radius: 6px;
        font-weight: 600;
        text-align: center;
        transition: all var(--transition-fast);
        text-decoration: none;
        font-size: 13px;
    }

    .wallet-cta:hover {
        background: var(--primary-dark);
    }

    /* 市场卡片 */
    .market-card {
        padding: 0 !important;
        overflow: hidden;
    }

    .market-card-img {
        background: #F9FAFB;
        padding: 6px;
        height: 150px !important;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .market-card-img img {
        max-height: 150px !important;
        object-fit: contain;
        max-width: 90%;
    }

    .market-card-body {
        padding: 12px !important;
    }

    .market-card-body h3 {
        font-size: 14px;
        font-weight: 700;
        margin: 0 0 6px 0 !important;
        color: var(--text-dark);
    }

    .market-card-body p {
        font-size: 12px;
        color: var(--text-light);
        line-height: 1.4;
        margin: 0 !important;
    }

    /* 图文横幅和步骤 */
    .section-banner,
    .step-row {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
        margin-bottom: 16px !important;
    }

    .section-banner .banner-img img,
    .step-row .step-img img {
        width: 100%;
        height: auto;
        border-radius: 6px;
        box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    }

    .section-banner .banner-text h3,
    .step-row .step-text h3 {
        font-size: 16px;
        font-weight: 700;
        margin: 0 0 8px 0;
        color: var(--text-dark);
    }

    .section-banner .banner-text p,
    .step-row .step-text p {
        font-size: 12px;
        color: var(--text-light);
        line-height: 1.5;
        margin: 0 0 8px 0;
    }

    /* FAQ */
    .faq-item {
        margin-bottom: 10px;
    }

    .faq-question {
        font-size: 13px;
        padding: 12px;
        background-color: var(--background-light);
    }

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

    .faq-answer p {
        padding: 12px;
        font-size: 12px;
        color: var(--text-light);
        line-height: 1.6;
    }

    .faq-toggle {
        font-size: 16px;
    }

    /* 安全提示框 */
    .security-highlight {
        padding: 12px;
        margin-top: 12px;
        background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
        border-left: 3px solid var(--warning-color);
    }

    .security-highlight h3 {
        font-size: 14px;
        font-weight: 700;
        margin: 0 0 10px 0;
        color: var(--text-dark);
    }

    .security-tips {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .security-tips li {
        font-size: 12px;
        color: var(--text-dark);
        margin: 6px 0;
        padding: 0;
        line-height: 1.4;
    }

    .security-tips li::before {
        content: '⚠️ ';
        margin-right: 6px;
        font-weight: 600;
    }

    /* 钱包警告框 */
    .wallet-warning {
        padding: 12px;
        margin-bottom: 12px;
        background-color: #FFFACD;
        border-left: 3px solid #FFD700;
        border-radius: 4px;
    }

    .wallet-warning h3 {
        font-size: 14px;
        font-weight: 700;
        margin: 0 0 8px 0;
        color: var(--text-dark);
    }

    .wallet-warning ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .wallet-warning li {
        font-size: 12px;
        color: var(--text-dark);
        margin: 6px 0;
        padding: 0;
        line-height: 1.4;
    }

    /* Footer */
    .footer {
        background-color: #1a1a1a;
        color: #d4d4d4;
        padding: 16px 0 12px 0 !important;
    }

    .footer-header {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 1px solid #333;
    }

    .footer-logo-section {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .footer-logo {
        width: 36px;
        height: 36px;
    }

    .footer-logo-section h3 {
        font-size: 14px;
        margin: 0;
    }

    .footer-logo-section p {
        font-size: 11px;
        margin: 2px 0 0 0;
    }

    .footer-social {
        display: flex;
        gap: 8px;
        width: 100%;
    }

    .footer-social a {
        flex: 1;
        width: 100%;
        height: 36px;
        font-size: 12px;
    }

    .footer-content {
        display: grid;
        grid-template-columns: 1fr 1fr !important;
        gap: 12px !important;
        margin-bottom: 12px !important;
    }

    .footer-section h4 {
        font-size: 12px;
        font-weight: 700;
        margin: 0 0 8px 0;
        color: white;
    }

    .footer-section a {
        font-size: 11px;
        color: #999;
        line-height: 1.6;
    }

    .footer-bottom-top {
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    .footer-disclaimer h4,
    .footer-security-badge h4 {
        font-size: 12px;
        margin: 0 0 6px 0;
    }

    .footer-disclaimer p,
    .footer-security-badge li {
        font-size: 11px;
        margin: 4px 0;
    }

    .footer-bottom {
        border-top: 1px solid #333;
        padding-top: 8px;
    }

    .footer-bottom-end {
        font-size: 10px;
        padding-top: 8px;
    }

    .footer-bottom-end p {
        margin: 3px 0;
    }

    /* 返回顶部按钮 */
    .back-to-top {
        width: 42px;
        height: 42px;
        bottom: 16px;
        right: 16px;
        font-size: 18px;
        background-color: var(--primary-color);
        color: white;
        border: none;
        border-radius: 50%;
        cursor: pointer;
        display: none;
        align-items: center;
        justify-content: center;
        box-shadow: 0 2px 8px rgba(0,0,0,0.15);
        transition: all var(--transition-fast);
        z-index: 999;
    }

    .back-to-top:hover {
        background-color: var(--primary-dark);
        transform: translateY(-2px);
    }

    .back-to-top.show {
        display: flex;
    }

    /* 容器间距优化 */
    .section {
        padding: 16px 0 !important;
    }

    .hero {
        padding: 16px 0 !important;
    }

    .container {
        padding: 0 12px !important;
        max-width: 100% !important;
    }
}

/* ============================================
   Logo样式
   ============================================ */

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

/* ============================================
   图文横幅与步骤布局
   ============================================ */

.section-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-banner .banner-img img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: block;
}

.section-banner .banner-text h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.section-banner .banner-text p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 16px;
    margin-bottom: var(--spacing-md);
}

.section-banner .banner-text p:last-child {
    margin-bottom: 0;
}

/* 步骤图文交错 */
.step-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.step-row .step-text h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.step-row .step-text p {
    color: var(--text-light);
    line-height: 1.8;
    margin: 0;
    font-size: 16px;
}

.step-row .step-img img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: block;
}

/* 应用场景卡片图片 */
.app-card-img {
    background: #F9FAFB;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    height: 160px;
}

.app-card-img img {
    max-width: 100%;
    height: auto;
    max-height: 160px;
    object-fit: contain;
    display: block;
}

/* 市场分析卡片 */
.market-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.market-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.market-card-img {
    background: #F9FAFB;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 240px;
}

.market-card-img img {
    max-width: 100%;
    height: auto;
    max-height: 240px;
    object-fit: contain;
    display: block;
}

.market-card-body {
    padding: var(--spacing-lg);
}

.market-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 var(--spacing-md) 0;
}

.market-card-body p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   钱包下载板块 - 新卡片设计
   ============================================ */

.wallet-featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.wallet-featured-card {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

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

.wallet-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.wallet-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    display: block;
}

.wallet-featured-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0 0 4px 0;
}

.wallet-featured-card > p {
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 var(--spacing-lg) 0;
}

.wallet-features {
    list-style: none;
    margin: 0 0 var(--spacing-lg) 0;
    padding: 0;
    flex-grow: 1;
}

.wallet-features li {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.4;
}

.wallet-features li:last-child {
    margin-bottom: 0;
}

.wallet-badges {
    display: flex;
    gap: 8px;
    margin-bottom: var(--spacing-lg);
}

.wallet-badges .badge {
    display: inline-block;
    background: linear-gradient(135deg, #E3F2FD 0%, #F3E5F5 100%);
    color: #1565C0;
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid #90CAF9;
    white-space: nowrap;
}

.wallet-cta {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.wallet-cta:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}

/* ============================================
   钱包下载板块
   ============================================ */

.wallet-download {
    background-color: var(--background-light);
}

.wallet-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.wallet-category {
    background-color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.wallet-category h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-dark);
}

.wallet-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.wallet-card {
    background: linear-gradient(135deg, #F9FAFB 0%, #FFFFFF 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.wallet-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.wallet-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-dark);
}

.wallet-card p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0 0 var(--spacing-md) 0;
    line-height: 1.5;
}

.wallet-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.wallet-btn {
    display: inline-block;
    padding: 6px 12px;
    background-color: var(--primary-color);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-align: center;
    flex: 1;
    min-width: 60px;
}

.wallet-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.05);
}

.wallet-warning {
    background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    width: 100%;
    max-width: 100%;
}

.wallet-warning h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

.wallet-warning ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.wallet-warning li {
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-sm) 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.wallet-warning li::before {
    content: '👉 ';
    margin-right: var(--spacing-sm);
    font-weight: 600;
}

/* ============================================
   新页脚样式
   ============================================ */

.footer-trust {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.trust-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.trust-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.trust-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
    color: white;
}

.trust-content p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
    line-height: 1.5;
}

.footer-divider {
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    margin: var(--spacing-xl) 0;
}

.footer-bottom-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-disclaimer {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 3px solid #FF6B6B;
}

.footer-disclaimer h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: #FF6B6B;
}

.footer-disclaimer p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.9);
    margin: var(--spacing-sm) 0;
    line-height: 1.6;
}

.footer-disclaimer strong {
    color: white;
}

.footer-security-badge {
    background: rgba(16, 185, 129, 0.1);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 3px solid #10B981;
}

.footer-security-badge h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    color: #10B981;
}

.footer-security-badge ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-security-badge li {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.9);
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
}

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

.footer-copyright p {
    margin: var(--spacing-sm) 0;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.8);
}

.footer-copyright a {
    color: var(--primary-color);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.footer-copyright a:hover {
    color: white;
}

/* ============================================
   打印样式
   ============================================ */

@media print {
    .navbar,
    .back-to-top,
    .hero-buttons {
        display: none;
    }

    body {
        color: black;
        background: white;
    }

    a {
        color: black;
    }

    .container {
        max-width: 100%;
    }
}

/* ============================================
   暗黑模式支持（可选）
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --text-dark: #F3F4F6;
        --text-light: #D1D5DB;
        --background-white: #111827;
        --background-light: #1F2937;
        --border-color: #374151;
    }

    .navbar {
        background-color: var(--background-white);
    }

    .feature-card,
    .guide-card,
    .security-item,
    .app-card,
    .notice-item,
    .contact-item,
    .faq-item {
        background-color: var(--background-light);
        border-color: var(--border-color);
    }

    .faq-question {
        background-color: var(--background-light);
        color: var(--text-dark);
    }

    .faq-answer {
        background-color: var(--background-light);
    }

    .security-highlight {
        background: rgba(245, 158, 11, 0.1);
    }
}