/* 兼容性和全局样式 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* iOS Safari 兼容性 */
html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-feature-settings: "kern" 1;
    -webkit-font-kerning: auto;
    font-kerning: auto;
}

/* 移动端触摸优化 */
button,
input,
select,
textarea,
a {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* Viewport 适配 */
@supports (padding: max(0px)) {
    .mobile-bottom-bar {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }
}

:root {
    /* 主色调 - XT品牌橙色 */
    --primary-color: #FF6B35;
    --primary-gradient: linear-gradient(135deg, #FF6B35 0%, #F59E0B 100%);
    
    /* 辅助色 */
    --secondary-color: #1E3A8A;
    --accent-color: #F59E0B;
    
    /* 中性色 */
    --white: #FFFFFF;
    --light-gray: #F8FAFC;
    --gray: #6B7280;
    --dark-gray: #374151;
    --black: #111827;
    
    /* 功能色 */
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'Roboto Mono', monospace;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 动画 */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
    overflow-x: hidden;
}

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

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

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

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

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

/* 标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
    margin-right: 24px;
    flex-wrap: wrap;
}

.nav-link {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    font-size: 14px;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.15s ease-in-out;
    white-space: nowrap;
}

.nav-link:hover {
    color: #FF6B35;
    background: rgba(255, 107, 53, 0.1);
    transform: translateY(-1px);
}

/* XT交易所特殊样式 - 第一个链接 */
.nav-link:first-child {
    color: #FF6B35;
    font-weight: 600;
    background: rgba(255, 107, 53, 0.08);
    border: 1px solid rgba(255, 107, 53, 0.2);
}

.nav-link:first-child:hover {
    background: rgba(255, 107, 53, 0.15);
    border-color: rgba(255, 107, 53, 0.3);
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.2);
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 50%, #FF6B35 100%);
    color: var(--white);
    padding: 8rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-left {
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.highlight {
    background: linear-gradient(45deg, #F59E0B, #FF6B35);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

/* 交易所展示区 */
.exchanges {
    padding: var(--spacing-3xl) 0;
    background: var(--light-gray);
}

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

.exchange-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.exchange-card.featured {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, #FFF5F0 0%, #FFFFFF 100%);
}

.card-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.exchange-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-md);
}

.exchange-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.feature-tag {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.exchange-bonus {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.bonus-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.exchange-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.exchange-actions .btn {
    flex: 1;
    justify-content: center;
}

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

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

/* 响应式设计 */
@media (max-width: 1199px) {
    .container {
        max-width: 960px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
}

/* 超宽屏优化 */
@media (min-width: 1400px) {
    .nav-menu {
        gap: 32px;
        margin-right: 32px;
    }
    
    .nav-link {
        font-size: 16px;
        padding: 10px 16px;
    }
}

/* 大屏幕优化 - 为6个交易所链接留出空间 */
@media (max-width: 1199px) {
    .nav-menu {
        gap: 12px;
        margin-right: 16px;
    }
    
    .nav-link {
        font-size: 13px;
        padding: 6px 8px;
    }
}

@media (max-width: 991px) {
    .container {
        max-width: 720px;
    }
    
    .nav-container {
        flex-wrap: wrap;
        justify-content: space-between;
        padding: 12px 16px;
    }
    
    .nav-menu {
        gap: 6px;
        order: 3;
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        margin: 8px 0 0 0;
    }
    
    .nav-link {
        font-size: 12px;
        padding: 4px 8px;
    }
    
    /* 在中等屏幕上保持XT交易所的特殊样式 */
    .nav-link:first-child {
        border-width: 1px;
        font-weight: 600;
    }
    
    .nav-actions {
        order: 2;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .exchanges-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .section-title {
        font-size: 1.875rem;
    }
    
    .exchanges-grid {
        grid-template-columns: 1fr;
    }
    
    .exchange-actions {
        flex-direction: column;
    }
}

@media (max-width: 575px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .exchange-card {
        padding: var(--spacing-lg);
    }
}

/* 特殊效果 */
.exchange-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.exchange-card:hover::before {
    opacity: 1;
}

.exchange-card.featured::before {
    opacity: 1;
}

/* 脉冲动画 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.btn-primary:hover {
    animation: pulse 0.5s ease-in-out;
}

/* 渐变背景动画 */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.hero {
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

/* 卡片悬浮效果增强 */
.exchange-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.exchange-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* 按钮波纹效果 */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

/* Loading 状态 */
.btn.loading {
    pointer-events: none;
    opacity: 0.6;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选择样式 */
::selection {
    background: var(--primary-color);
    color: var(--white);
}

/* 焦点样式 */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 禁用状态 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #CC5500;
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    }
}

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

/* 实时行情数据区 */
.markets {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.market-table-container {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.market-grid {
    display: grid;
    gap: 1px;
    background: var(--light-gray);
}

.market-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--white);
    transition: background-color var(--transition-fast);
}

.market-item:hover {
    background: var(--light-gray);
}

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

.crypto-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.crypto-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--black);
}

.crypto-volume {
    font-size: 0.875rem;
    color: var(--gray);
}

.crypto-price {
    text-align: right;
}

.price {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: var(--spacing-xs);
}

.change {
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.change.positive {
    color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.change.negative {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.mini-chart {
    width: 60px;
    height: 30px;
}

/* 产品功能展示区 */
.products {
    padding: var(--spacing-3xl) 0;
    background: var(--light-gray);
}

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

.product-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.product-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.product-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-md);
}

.product-description {
    color: var(--gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.feature {
    font-size: 0.875rem;
    color: var(--success-color);
    font-weight: 500;
}

/* 平台数据展示区 */
.platform-stats {
    padding: var(--spacing-3xl) 0;
    background: var(--secondary-color);
    color: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.stat-label {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

/* 平台优势区 */
.advantages {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

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

.advantage-item {
    text-align: center;
    padding: var(--spacing-2xl);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    background: rgba(255, 107, 53, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
}

.advantage-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-md);
}

.advantage-description {
    color: var(--gray);
    line-height: 1.6;
}

/* 下载APP区域 */
.app-download {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.app-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e2e8f0" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-lg);
}

.download-subtitle {
    font-size: 1.125rem;
    color: var(--gray);
    margin-bottom: var(--spacing-2xl);
}

.app-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

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

.app-feature i {
    color: var(--success-color);
    font-size: 1.125rem;
}

.download-buttons {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    border-radius: 16px;
    text-decoration: none;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #34D399 0%, #10B981 100%);
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(52, 211, 153, 0.3);
    border: none;
    min-width: 200px;
    justify-content: flex-start;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(52, 211, 153, 0.4);
}

.download-btn i {
    font-size: 24px;
    flex-shrink: 0;
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-text span {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.btn-text small {
    font-size: 12px;
    opacity: 0.8;
}

/* 二维码样式 */
.qr-code {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border: 2px dashed #cbd5e1;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.qr-placeholder:hover {
    border-color: #FF6B35;
}

.qr-placeholder i {
    font-size: 32px;
    color: #64748b;
}

.qr-code p {
    margin: 0;
    font-size: 14px;
    color: #64748b;
    font-weight: 500;
}

/* 兼容性增强 */
@supports not (backdrop-filter: blur(10px)) {
    .balance-card {
        background: rgba(255, 255, 255, 0.25);
    }
    
    .action-btn {
        background: rgba(255, 255, 255, 0.3);
    }
}

/* Grid 不支持时的 Flexbox 备用方案 */
@supports not (display: grid) {
    .download-content {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .quick-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .action-btn {
        flex: 1;
        min-width: 120px;
    }
}

/* 减少动画的用户偏好支持 */
@media (prefers-reduced-motion: reduce) {
    .phone-mockup {
        animation: none;
    }
    
    .feature-item:hover {
        transform: none;
    }
    
    .download-btn:hover {
        transform: none;
    }
}

/* 手机模型 */
.phone-mockup {
    max-width: 300px;
    margin: 0 auto;
    position: relative;
    animation: float 6s ease-in-out infinite;
}

.phone-screen {
    background: #1a1a1a;
    border-radius: 30px;
    padding: 15px;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        0 10px 20px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
}

.phone-screen::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: #666;
    border-radius: 2px;
}

.app-interface {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 20px;
    height: 500px;
    position: relative;
    overflow: hidden;
}

.app-interface::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: inherit;
}

.app-header {
    margin-bottom: 30px;
    position: relative;
    z-index: 2;
}

.balance-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.balance-title {
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.balance-amount {
    color: #ffffff;
    font-size: 24px;
    font-weight: 700;
    margin: 0;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    position: relative;
    z-index: 2;
}

.action-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #ffffff;
    padding: 12px 16px;
    border-radius: 12px;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* 下载选项区域 */
.download-options {
    padding-left: 20px;
}

.download-features {
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: #ffffff;
    transform: translateX(8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #FF6B35 0%, #F59E0B 100%);
    color: #ffffff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.feature-text h4 {
    margin: 0 0 4px 0;
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
}

.feature-text p {
    margin: 0;
    color: #6b7280;
    font-size: 14px;
}

.phone-frame {
    background: var(--black);
    border-radius: 25px;
    padding: 20px 15px;
    box-shadow: var(--shadow-xl);
}

.phone-screen {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    aspect-ratio: 9/16;
}

.app-demo {
    padding: var(--spacing-lg);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.demo-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.demo-logo {
    width: 30px;
    height: 30px;
    background: var(--primary-gradient);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.demo-title {
    font-weight: 600;
    color: var(--black);
}

.demo-balance {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--light-gray);
    border-radius: var(--radius-md);
}

.balance-label {
    font-size: 0.75rem;
    color: var(--gray);
    margin-bottom: var(--spacing-xs);
}

.balance-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
}

.demo-markets {
    flex: 1;
    margin-bottom: var(--spacing-lg);
}

.market-item-demo {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--light-gray);
}

.symbol {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--black);
}

.price-demo {
    font-size: 0.875rem;
    font-weight: 600;
}

.price-demo.positive {
    color: var(--success-color);
}

.demo-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.demo-btn {
    padding: var(--spacing-sm);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.75rem;
}

.demo-btn.buy {
    background: var(--success-color);
    color: var(--white);
}

.demo-btn.sell {
    background: var(--danger-color);
    color: var(--white);
}

/* 新闻资讯区 */
.news-section {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.news-item {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.news-image {
    height: 200px;
    background: var(--light-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-placeholder {
    font-size: 3rem;
    color: var(--gray);
}

.news-content {
    padding: var(--spacing-xl);
}

.news-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.news-excerpt {
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.news-date {
    font-size: 0.875rem;
    color: var(--gray);
}

.news-tag {
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

/* 页脚 */
.footer {
    background: var(--black);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.contact-info p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all var(--transition-normal);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* 移动端底部固定按钮 */
.mobile-bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding: 12px 16px;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    z-index: 1000;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    /* 添加安全区域适配 */
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    /* Flexbox 备用方案 */
    display: none;
}

/* 支持Grid的浏览器 */
@supports (display: grid) {
    .mobile-bottom-bar {
        grid-template-columns: 1fr 1fr;
    }
}

/* 不支持Grid的浏览器使用Flexbox */
@supports not (display: grid) {
    .mobile-bottom-bar {
        display: flex;
        flex-direction: row;
    }
    
    .mobile-register-btn,
    .mobile-download-btn {
        flex: 1;
        margin: 0 6px;
    }
}

.mobile-register-btn,
.mobile-download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    min-height: 44px;
    /* 确保触摸友好的最小高度 */
}

/* 移除重复的样式定义，使用下面的更完善定义 */

.mobile-register-btn:hover,
.mobile-download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.mobile-register-btn:active,
.mobile-download-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 防止iOS双击缩放 */
.mobile-register-btn,
.mobile-download-btn {
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}

/* 提高按钮对比度 */
.mobile-register-btn {
    background: linear-gradient(135deg, #FF6B35 0%, #F59E0B 100%);
    border: none;
    color: #FFFFFF;
}

.mobile-download-btn {
    background: #1E3A8A;
    border: none;
    color: #FFFFFF;
}

/* 响应式更新 */
@media (max-width: 991px) {
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .download-options {
        padding-left: 0;
    }
    
    .phone-mockup {
        max-width: 250px;
    }
    
    .app-interface {
        height: 400px;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 平板设备优化 */
    .exchanges-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 767px) {
    /* 显示移动端底部按钮 */
    .mobile-bottom-bar {
        display: grid !important;
        visibility: visible;
        opacity: 1;
    }
    
    /* 为底部按钮留出空间 */
    body {
        padding-bottom: calc(80px + env(safe-area-inset-bottom));
    }
    
    /* 确保按钮在小屏幕上可见 */
    .mobile-register-btn,
    .mobile-download-btn {
        display: flex !important;
        font-size: 13px;
        padding: 10px 12px;
    }
    
    /* 隐藏桌面端的一些元素 */
    .nav-menu {
        display: none;
    }
    
    .nav-actions {
        display: none;
    }
    
    .nav-container {
        padding: 12px 16px;
    }
    
    .market-item {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .products-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
    
    .download-btn {
        width: 100%;
        max-width: 280px;
    }
    
    .qr-code {
        margin-top: 20px;
    }
    
    .qr-placeholder {
        width: 100px;
        height: 100px;
    }
    
    .feature-item {
        padding: 12px;
        margin-bottom: 16px;
    }
    
    .feature-item i {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .feature-text h4 {
        font-size: 14px;
    }
    
    .feature-text p {
        font-size: 12px;
    }
    
    .app-download {
        padding: 60px 0;
    }
    
    .phone-mockup {
        max-width: 220px;
    }
    
    .app-interface {
        height: 350px;
        padding: 16px;
    }
    
    .balance-amount {
        font-size: 20px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .download-title {
        font-size: 2rem;
    }
}

@media (max-width: 575px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        padding: 12px 20px;
        min-width: auto;
    }
    
    .btn-text span {
        font-size: 14px;
    }
    
    .btn-text small {
        font-size: 11px;
    }
    
    .app-download {
        padding: 40px 0;
    }
    
    .download-content {
        gap: 30px;
    }
    
    .phone-mockup {
        max-width: 200px;
    }
    
    .app-interface {
        height: 300px;
        padding: 12px;
    }
    
    .balance-card {
        padding: 16px;
    }
    
    .balance-amount {
        font-size: 18px;
    }
    
    .action-btn {
        padding: 10px 12px;
        font-size: 12px;
    }
    
    .download-features {
        margin-bottom: 30px;
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
        padding: 16px;
        gap: 12px;
    }
    
    .feature-item:hover {
        transform: none;
    }
    
    .qr-placeholder {
        width: 80px;
        height: 80px;
    }
    
    .qr-placeholder i {
        font-size: 24px;
    }
    
    /* 超小屏幕下的移动端按钮优化 */
    .mobile-bottom-bar {
        padding: 8px 12px;
        padding-bottom: calc(8px + env(safe-area-inset-bottom));
    }
    
    .mobile-register-btn,
    .mobile-download-btn {
        font-size: 12px;
        padding: 8px 10px;
        gap: 4px;
    }
    
    .mobile-register-btn i,
    .mobile-download-btn i {
        font-size: 14px;
    }
    
    /* 容器适配 */
    .container {
        padding: 0 12px;
    }
    
    /* 导航适配 */
    .nav-container {
        padding: 12px;
    }
    
    .nav-logo {
        font-size: 1.2rem;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .btn,
    .exchange-actions,
    .mobile-bottom-bar {
        display: none !important;
    }
    
    .hero {
        background: none !important;
        color: var(--black) !important;
    }
    
    .exchange-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid var(--gray);
    }
    
    body {
        padding-bottom: 0 !important;
    }
}