/* ========================================
   BTCDW - 比特币中文知识平台
   全局样式 - 响应式 + 动效
   ======================================== */

/* -------- 重置与基础变量 -------- */
:root {
    --primary-color: #0052CC;
    --primary-light: #1E7FFF;
    --primary-dark: #003A99;
    --secondary-color: #1B3D8E;
    --success-color: #00B4A0;
    --warning-color: #FF9800;
    --danger-color: #FF6B6B;

    --neutral-white: #FFFFFF;
    --neutral-light: #F5F7FA;
    --neutral-light-gray: #E8EEF5;
    --neutral-gray: #D0D7E0;
    --neutral-dark-gray: #6B7280;
    --neutral-dark: #1F2937;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.12);

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans CJK SC', 'Noto Sans', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--neutral-dark);
    background-color: var(--neutral-white);
    overflow-x: hidden;
}

/* -------- 排版 -------- */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.4;
    color: var(--neutral-dark);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--neutral-dark-gray);
    line-height: 1.7;
}

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

a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

ul, ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

ul li, ol li {
    margin-bottom: var(--spacing-sm);
    color: var(--neutral-dark-gray);
    line-height: 1.7;
}

strong {
    font-weight: 600;
    color: var(--neutral-dark);
}

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

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* -------- 导航栏 -------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--neutral-light-gray);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-dark);
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--primary-color);
}

.logo-image {
    height: 40px;
    width: auto;
    max-width: 50px;
    object-fit: contain;
    margin-right: 4px;
}

.logo-icon {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.logo-text {
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--neutral-dark-gray);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.mobile-toggle span {
    width: 25px;
    height: 2px;
    background: var(--neutral-dark);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .nav-menu {
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: white;
        gap: 0;
        border-bottom: 1px solid var(--neutral-light-gray);
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
    }

    .nav-menu.active {
        max-height: 400px;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        border-bottom: 1px solid var(--neutral-light-gray);
        text-align: center;
        font-size: 1rem;
    }

    .nav-link::after {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
}

/* -------- Hero 首屏 -------- */
.hero {
    position: relative;
    padding: 100px var(--spacing-lg) 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
}

.hero-pattern {
    position: absolute;
    top: 0;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 82, 204, 0.05) 0%, transparent 70%);
    animation: float 8s ease-in-out infinite;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badges {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(0, 82, 204, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(0, 82, 204, 0.2);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
    color: var(--neutral-dark);
    animation: slideInUp 0.8s ease 0.1s both;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--neutral-dark-gray);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.8;
    animation: slideInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
    animation: slideInUp 0.8s ease 0.3s both;
}

.btn {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 82, 204, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 8px 20px rgba(0, 82, 204, 0.4);
    transform: translateY(-2px);
}

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

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
    animation: slideInUp 0.8s ease 0.4s both;
}

.stat-item {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--neutral-dark-gray);
    margin-top: var(--spacing-xs);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

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

@media (max-width: 768px) {
    .hero {
        padding: 60px var(--spacing-md) 50px;
    }

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

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: var(--spacing-xl);
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* -------- 通用Section样式 -------- */
.section {
    padding: 80px var(--spacing-lg);
}

.section-alt {
    background: var(--neutral-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-dark);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--neutral-dark-gray);
    margin-bottom: var(--spacing-2xl);
}

.section-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    margin-bottom: var(--spacing-2xl);
}

.content-text h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    margin-left: 0;
}

.feature-list li {
    padding: var(--spacing-md);
    background: var(--neutral-light);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.feature-list li:hover {
    background: linear-gradient(90deg, rgba(0, 82, 204, 0.05), rgba(0, 82, 204, 0));
    transform: translateX(4px);
}

/* -------- 表格 -------- */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.comparison-table th {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
}

.comparison-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--neutral-light-gray);
    color: var(--neutral-dark-gray);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tbody tr:hover {
    background: var(--neutral-light);
}

/* -------- 内容视觉 -------- */
.content-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.visual-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, rgba(0, 82, 204, 0.05), rgba(0, 82, 204, 0.1));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.visual-icon {
    width: 100%;
    height: 100%;
    animation: rotateIcon 20s linear infinite;
}

.visual-caption {
    text-align: center;
    font-size: 0.95rem;
    color: var(--neutral-dark-gray);
    margin: 0;
}

@keyframes rotateIcon {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .section {
        padding: 50px var(--spacing-md);
    }

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

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

/* -------- 流程卡片 -------- */
.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.process-card {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

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

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

.process-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.2;
    margin-bottom: var(--spacing-md);
}

.process-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.process-card p {
    font-size: 0.95rem;
    color: var(--neutral-dark-gray);
    margin: 0;
}

/* -------- 区块链说明 -------- */
.blockchain-explanation {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    margin-top: var(--spacing-lg);
}

.block-items {
    list-style: none;
    margin-left: 0;
}

.block-items li {
    padding: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--neutral-dark-gray);
}

.block-items li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* -------- 指南卡片 -------- */
.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.guide-card {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    transition: all var(--transition-normal);
}

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

.guide-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.guide-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.guide-detail p {
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.guide-detail p:last-child {
    margin-bottom: 0;
}

/* -------- 安全模块 -------- */
.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.security-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--neutral-light-gray);
    transition: all var(--transition-normal);
}

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

.security-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.security-header h3 {
    color: white;
    margin: 0;
    font-size: 1.1rem;
}

.security-content {
    padding: var(--spacing-lg);
}

.security-content ul {
    list-style: none;
    margin: 0;
}

.security-content li {
    padding: var(--spacing-sm) 0;
    color: var(--neutral-dark-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* -------- 应用场景 -------- */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.scenario-card {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    text-align: center;
    transition: all var(--transition-normal);
}

.scenario-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(0, 82, 204, 0.05), rgba(0, 82, 204, 0));
}

.scenario-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.scenario-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.scenario-card p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--neutral-dark-gray);
    line-height: 1.7;
}

/* -------- 数据统计 -------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat-card {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.stat-label {
    font-size: 0.85rem;
    color: var(--neutral-dark-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--neutral-dark-gray);
    margin: 0;
}

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

.faq-item {
    margin-bottom: var(--spacing-md);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.faq-question {
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background: white;
    transition: all var(--transition-fast);
    user-select: none;
}

.faq-item.active .faq-question {
    background: linear-gradient(135deg, rgba(0, 82, 204, 0.05), rgba(0, 82, 204, 0));
}

.faq-question:hover {
    background: var(--neutral-light);
}

.faq-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--neutral-dark);
    margin: 0;
    text-align: left;
}

.faq-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    flex-shrink: 0;
    margin-left: var(--spacing-md);
    font-weight: bold;
    transition: transform var(--transition-fast);
}

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

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

.faq-item.active .faq-answer {
    padding: var(--spacing-lg);
    max-height: 1000px;
}

.faq-answer p {
    color: var(--neutral-dark-gray);
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 0;
}

/* -------- 平台声明 -------- */
.disclaimer-box {
    background: white;
    border: 2px solid var(--warning-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
}

.disclaimer-box h2 {
    color: var(--warning-color);
    margin-bottom: var(--spacing-lg);
}

.disclaimer-content h3 {
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-size: 1.15rem;
}

.disclaimer-content ul {
    margin-left: var(--spacing-lg);
}

.disclaimer-content li {
    color: var(--neutral-dark-gray);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 768px) {
    .disclaimer-box {
        padding: var(--spacing-lg);
    }
}

/* -------- 页脚 -------- */
.footer {
    background: linear-gradient(135deg, #0a1428 0%, #1f2937 100%);
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

/* 页脚顶部 */
.footer-top {
    padding: var(--spacing-3xl) var(--spacing-lg);
    border-bottom: 1px solid rgba(0, 82, 204, 0.2);
}

.footer-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 1.8rem;
    margin: 0 0 var(--spacing-sm) 0;
    color: white;
}

.footer-tagline {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.footer-section {
    flex: 1;
}

.footer-section h3 {
    color: white;
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-text p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.8);
    margin: 0 0 var(--spacing-md) 0;
}

.footer-emphasis {
    background: rgba(0, 82, 204, 0.1);
    padding: var(--spacing-md);
    border-left: 3px solid var(--primary-color);
    border-radius: var(--radius-md);
    color: #87CEEB;
    font-size: 0.85rem;
    font-weight: 500;
}

/* 承诺列表 */
.footer-promises {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-promises li {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: rgba(0, 82, 204, 0.05);
    border-left: 2px solid var(--primary-color);
    border-radius: var(--radius-sm);
}

.footer-promises strong {
    color: white;
    display: block;
    margin-bottom: 2px;
}

.footer-promises span {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

/* 链接 */
.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: var(--spacing-md);
}

.footer-links li {
    margin: 0;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.footer-links a:hover {
    color: white;
    transform: translateX(4px);
    text-decoration: none;
}

/* 联系信息 */
.footer-contact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.contact-item {
    padding: var(--spacing-md);
    background: rgba(0, 82, 204, 0.08);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.contact-item strong {
    display: block;
    color: white;
    margin-bottom: 4px;
}

.footer-contact strong {
    font-size: 0.9rem;
}

.footer-note {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-md);
}

/* 信任徽章 */
.trust-badges {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg);
    background: rgba(0, 82, 204, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 82, 204, 0.2);
    text-align: center;
}

.badge-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.badge-text {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.4;
}

/* 页脚底部 */
.footer-bottom {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.footer-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 82, 204, 0.3), transparent);
    margin-bottom: var(--spacing-lg);
}

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

.legal-content h4,
.safety-info h4 {
    color: white;
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.legal-list li {
    padding: var(--spacing-sm) 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.6;
}

.legal-list strong {
    color: #87CEEB;
}

.legal-emphasis {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(0, 82, 204, 0.15);
    border-left: 3px solid var(--primary-light);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.legal-emphasis a {
    color: #87CEEB;
    font-weight: 600;
}

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

.safety-tips li {
    padding: var(--spacing-sm) 0;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin: 0;
}

.safety-tips li::before {
    content: '';
    margin-right: 6px;
}

/* 版权信息 */
.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;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

.footer-copyright p:first-child {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

.footer-status {
    color: rgba(0, 220, 130, 0.9);
    font-size: 0.8rem;
    margin-top: var(--spacing-md);
}

@media (max-width: 768px) {
    .footer-top {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .footer-bottom {
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

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

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

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

@media (max-width: 768px) {
    .footer {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .footer-content {
        gap: var(--spacing-lg);
    }
}

/* -------- 钱包下载模块 -------- */
.wallets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.wallet-card {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.wallet-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

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

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

.wallet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--neutral-light-gray);
}

.wallet-header h3 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.25rem;
}

.wallet-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(0, 82, 204, 0.1), rgba(0, 82, 204, 0.05));
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--primary-color);
    font-weight: 600;
    white-space: nowrap;
}

.wallet-content {
    flex-grow: 1;
    margin-bottom: var(--spacing-lg);
}

.wallet-content p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.wallet-content ul {
    list-style: none;
    margin-left: 0;
    margin-bottom: var(--spacing-md);
}

.wallet-content li {
    padding: 4px 0;
    color: var(--neutral-dark-gray);
    font-size: 0.9rem;
    margin: 0;
}

.btn-wallet {
    display: block;
    text-align: center;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-wallet:hover {
    box-shadow: 0 6px 16px rgba(0, 82, 204, 0.3);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

.wallet-tips {
    background: linear-gradient(135deg, rgba(0, 82, 204, 0.05), rgba(0, 82, 204, 0));
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-light-gray);
}

.wallet-tips h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.tip-item {
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.tip-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.tip-desc {
    display: block;
    font-size: 0.85rem;
    color: var(--neutral-dark-gray);
    margin-top: var(--spacing-xs);
}

/* -------- 图片展示库 -------- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    auto-rows: 280px;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--neutral-light);
    border: 1px solid var(--neutral-light-gray);
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    background: white;
}

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

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-large {
    grid-column: span 1;
    auto-rows: 350px;
}

@media (min-width: 1200px) {
    .gallery-large {
        grid-column: span 2;
    }
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.7));
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gallery-item:hover .gallery-caption {
    opacity: 1;
}

@media (max-width: 768px) {
    .gallery-grid {
        auto-rows: 200px;
    }

    .gallery-large {
        auto-rows: 200px;
    }

    .gallery-item {
        min-height: 200px;
    }
}

/* -------- 返回顶部按钮 -------- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 82, 204, 0.4);
}

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

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.2rem;
    }
}

/* -------- 响应式手机优化 -------- */
@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .hero {
        padding: 40px var(--spacing-md) 30px;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

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

    .btn {
        width: 100%;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .process-grid,
    .guide-grid,
    .security-grid,
    .scenarios-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        font-size: 0.85rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }
}

/* -------- 打印优化 -------- */
@media print {
    .navbar,
    .back-to-top {
        display: none;
    }

    body {
        background: white;
    }

    .section {
        page-break-inside: avoid;
    }
}