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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
}

li::marker {
    unicode-bidi: isolate;
    font-variant-numeric: tabular-nums;
    text-transform: none;
    text-indent: 0px !important;
    text-align: start !important;
    text-align-last: auto !important;
}

.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: #0052cc;
    transition: color 0.2s ease;
}

a:hover {
    color: #003d99;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: #0052cc;
    color: white;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #003d99;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 82, 204, 0.2);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid #0052cc;
    color: #0052cc;
}

.btn-outline:hover {
    background-color: #0052cc;
    color: white;
}

/* 头部样式 */
header {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #f0f0f0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
}

header h1 a {
    color: #0052cc;
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-img {
    width: 170px;
    height: 55px;
    display: block;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    background: linear-gradient(135deg, #0052cc, #0077ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header nav {
    display: flex;
    align-items: center;
    gap: 30px;
}

header nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
    margin: 0;
    padding: 0;
}

header nav ul li a {
    color: #1a1a1a;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
    position: relative;
}

header nav ul li a:hover {
    color: #0052cc;
}

header nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #0052cc;
    transition: width 0.3s ease;
}

header nav ul li a:hover::after {
    width: 100%;
}

/* 主要内容区域 */
main {
    margin-top: 80px;
    padding: 0;
}

/* 英雄区域 - 金融平台风格 */
.hero {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    padding: 40px 0;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
    background: linear-gradient(135deg, #0077ff, #00aaff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffffff;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: #cccccc;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.btn-primary {
    background: linear-gradient(135deg, #0077ff, #00aaff);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0066cc, #0088ff);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 119, 255, 0.3);
}

/* 市场行情显示器 */
.market-ticker {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.ticker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.ticker-header h3 {
    color: white;
    margin: 0;
    font-size: 1.2rem;
}

.refresh-badge {
    background: #00cc00;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.ticker-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ticker-item:last-child {
    border-bottom: none;
}

.ticker-item .symbol {
    font-weight: 600;
    color: white;
}

.ticker-item .price {
    font-weight: 600;
    color: white;
}

.ticker-item .change {
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
}

.ticker-item .change.positive {
    background: rgba(0, 204, 0, 0.2);
    color: #00cc00;
}

.ticker-item .change.negative {
    background: rgba(204, 0, 0, 0.2);
    color: #cc0000;
}

/* 特性部分 */
.features-section {
    padding: 100px 0;
    background: #ffffff;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
    text-align: center;
    border: 1px solid #f0f0f0;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.feature-card .feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 交易工具部分 */
.trading-tools {
    padding: 100px 0;
    background: #f8f9ff;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.tool-card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.tool-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #0052cc;
}

.tool-card p {
    color: #666;
    line-height: 1.6;
}

/* 应用下载CTA */
.app-download {
    padding: 100px 0;
    background: linear-gradient(135deg, #0052cc 0%, #0077ff 100%);
    color: white;
    text-align: center;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.download-content p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.download-buttons .btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    font-weight: 600;
}

.download-buttons .btn-outline {
    background: transparent;
    border: 2px solid white;
    color: white;
}

.download-buttons .btn-outline:hover {
    background: white;
    color: #0052cc;
}

.download-buttons .icon {
    font-size: 1.2rem;
}

/* 特性网格 */
.features {
    padding: 100px 0;
    background: #ffffff;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.section-title p {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature {
    background: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    text-align: center;
    border: 1px solid #f0f0f0;
}

.feature:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #0052cc, #0077ff);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.feature h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.feature p {
    color: #666;
    line-height: 1.6;
}

/* 服务网格 */
.services {
    padding: 100px 0;
    background: #f8f9ff;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.service:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #0052cc;
}

/* 页脚样式 */
footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: white;
    padding: 60px 0 30px;
}

footer .container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 5px;
}

.footer-brand h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #ccc, #ccc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    color: #ccc;
    line-height: 1.6;
    margin-bottom: 20px;
}

.footer-links h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: #ffffff;
}

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

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #ccc;
    transition: color 0.2s ease;
}

.footer-links ul li a:hover {
    color: #0077ff;
}

.footer-bottom {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    margin-top: 40px;
}

.footer-bottom p {
    color: #999;
    margin: 0;
}

/* 语言切换器样式 */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 10px;
}

.language-switcher select {
    border: none;
    background: transparent;
    color: #666;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 4px 8px;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.language-switcher select:focus {
    outline: none;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    footer .container {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .hero .container {
        gap: 40px;
    }

    .hero-content h1 {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: row;
        gap: 0;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .market-ticker {
        order: -1;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .feature-card {
        padding: 25px;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .tool-card {
        padding: 25px;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-buttons .btn {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .feature {
        padding: 30px;
    }

    footer .container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .service {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 80px 0 40px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .section-title h2 {
        font-size: 2rem;
    }

    .feature {
        padding: 20px;
    }

    .feature-card {
        padding: 20px;
    }

    .tool-card {
        padding: 20px;
    }

    .service {
        padding: 20px;
    }

    .download-content h2 {
        font-size: 2rem;
    }

    .download-content p {
        font-size: 1rem;
    }

    /* 移动端表格优化 */
    .ticker-item {
        flex-wrap: wrap;
        gap: 8px;
    }

    .ticker-item .symbol,
    .ticker-item .price,
    .ticker-item .change {
        flex: 1;
        min-width: 80px;
        text-align: center;
    }
}

/* 超小屏幕设备 */
@media (max-width: 360px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-buttons .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .feature-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    .feature h3 {
        font-size: 1.2rem;
    }

    .feature-card .feature-icon {
        font-size: 2rem;
    }

    .feature-card h3 {
        font-size: 1.1rem;
    }
}

/* 横屏模式优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: 60px 0;
    }

    .nav-menu {
        padding: 60px 20px 20px;
    }

    .nav-menu ul li a {
        padding: 10px 0;
        font-size: 1rem;
    }
}

/* 移动端导航菜单 */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 30px;
        height: 24px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 1000;
    }

    .mobile-menu-toggle span {
        display: block;
        height: 3px;
        width: 100%;
        background-color: #1a1a1a;
        border-radius: 3px;
        transition: all 0.3s ease;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: translateY(10px) rotate(45deg);
    }

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: translateY(-10px) rotate(-45deg);
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: white;
        box-shadow: -5px 0 25px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
        padding: 80px 30px 30px;
        transition: right 0.3s ease;
        z-index: 999;
        overflow-y: auto;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu ul {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }

    .nav-menu ul li {
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-menu ul li:last-child {
        border-bottom: none;
    }

    .nav-menu ul li a {
        display: block;
        padding: 15px 0;
        font-size: 1.1rem;
        font-weight: 500;
    }

    .nav-menu ul li a::after {
        display: none;
    }

    .language-switcher {
        margin-top: 30px;
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
        width: 100%;
    }

    .language-switcher select {
        font-size: 1rem;
        padding: 8px 12px;
    }

    /* 防止背景滚动 */
    body.menu-open {
        overflow: hidden;
    }

    /* 覆盖层 */
    .nav-menu::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: -1;
    }

    .nav-menu.active::before {
        opacity: 1;
        visibility: visible;
    }
}

/* 超小屏幕导航优化 */
@media (max-width: 480px) {
    .nav-menu {
        width: 85%;
        padding: 70px 20px 20px;
    }

    .nav-menu ul li a {
        font-size: 1rem;
        padding: 12px 0;
    }

    .language-switcher {
        margin-top: 20px;
    }
}

/* 高DPI设备优化 */
@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
    .mobile-menu-toggle span {
        height: 2.5px;
    }
}

/* 减少动画对性能的影响 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}


/* 联系页面样式 */
.contact {
    padding: 40px 0;
}

.contact .container {
    max-width: 1000px;
}

.contact h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 40px;
    color: #1a1a1a;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #0052cc;
}

.contact-info p {
    line-height: 2;
    margin-bottom: 15px;
    color: #666;
}

.contact-info p strong {
    color: #1a1a1a;
}

.contact-form {
    background: #f8f9ff;
    padding: 25px;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #1a1a1a;
    line-height: 1.6;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    line-height: 1.6;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0052cc;
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 30px;
    text-align: center;
    line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form {
        padding: 25px;
    }

    .contact h2 {
        font-size: 2rem;
    }

    .contact-info h3,
    .contact-form h3 {
        font-size: 1.3rem;
    }
}

/* 佣金费率表格样式 */
.commission-table {
    padding: 80px 0;
    background: #f8f9ff;
}

.table-container {
    overflow-x: auto;
    margin: 30px 0;
    border-radius: 12px;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
}

.commission-rates-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.commission-rates-table th,
.commission-rates-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
}

.commission-rates-table th {
    background: linear-gradient(135deg, #0052cc, #0077ff);
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.commission-rates-table tr:hover {
    background-color: #f8f9ff;
}

.commission-rates-table td {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

.commission-rates-table td:first-child {
    font-weight: 600;
    color: #1a1a1a;
}

.table-notes {
    text-align: center;
    margin-top: 20px;
    color: #999;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 响应式表格 */
@media (max-width: 768px) {
    .commission-table {
        padding: 60px 0;
    }

    .commission-rates-table th,
    .commission-rates-table td {
        padding: 12px 15px;
        font-size: 0.85rem;
    }

    .commission-rates-table th {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .commission-rates-table {
        font-size: 0.8rem;
    }

    .commission-rates-table th,
    .commission-rates-table td {
        padding: 10px 12px;
    }

    .table-container {
        margin: 20px -15px;
        border-radius: 0;
    }
}

/* Tabbed Interface Styles */
.tabs-container {
    margin: 40px 0;
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 10px;
}

.tab-button {
    padding: 12px 24px;
    background-color: #f0f0f0;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.tab-button:hover {
    background-color: #e0e0e0;
    color: #333;
}

.tab-button.active {
    background: linear-gradient(135deg, #0052cc, #0077ff);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 82, 204, 0.2);
}

.tab-content {
    border: 1px solid #f0f0f0;
    border-radius: 12px;
    background: white;
    overflow: hidden;
}

.tab-pane {
    display: none;
    padding: 0;
}

.tab-pane.active {
    display: block;
}

/* Responsive Tabs */
@media (max-width: 768px) {
    .tabs {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .tab-button {
        width: 100%;
        max-width: 300px;
        text-align: center;
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .tabs {
        gap: 6px;
    }

    .tab-button {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .tab-content {
        border-radius: 8px;
    }
}

/* Volume Discounts Styles */
.volume-discounts {
    margin-top: 40px;
    padding: 30px;
    background: #f8f9ff;
    border-radius: 12px;
    border: 1px solid #e0e0e0;
}

.volume-discounts h4 {
    font-size: 1.4rem;
    color: #0052cc;
    margin-bottom: 25px;
    text-align: center;
    font-weight: 600;
}

.discount-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.discount-tier {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid #f0f0f0;
}

.discount-tier h5 {
    font-size: 1.1rem;
    color: #1a1a1a;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: center;
    padding-bottom: 15px;
    border-bottom: 2px solid #0052cc;
}

.discount-tier p {
    margin: 12px 0;
    color: #666;
    line-height: 1.5;
    font-size: 0.95rem;
}

.discount-tier p:first-of-type {
    margin-top: 0;
}

.discount-tier p:last-of-type {
    margin-bottom: 0;
}

/* Responsive Design for Discounts */
@media (max-width: 768px) {
    .volume-discounts {
        padding: 20px;
        margin-top: 30px;
    }

    .discount-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .discount-tier {
        padding: 20px;
    }

    .volume-discounts h4 {
        font-size: 1.2rem;
        margin-bottom: 20px;
    }
}

@media (max-width: 480px) {
    .volume-discounts {
        padding: 15px;
        margin-top: 25px;
    }

    .discount-tier {
        padding: 15px;
    }

    .discount-tier h5 {
        font-size: 1rem;
        margin-bottom: 15px;
    }

    .discount-tier p {
        font-size: 0.9rem;
        margin: 10px 0;
    }
}

/* 帮助页面样式 */
.nav-item {
    position: relative;
    list-style: none;
}

.subnav {
    display: none;
    /* 默认隐藏 */
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    padding: 0;
    margin: 0;
}

.subnav li {
    padding: 0;
}

.subnav a {
    display: block;
    padding: 10px;
    color: #333;
    text-decoration: none;
}

.subnav a:hover {
    background: #f0f0f0;
}

/* 当有active类时显示下拉菜单 */
.subnav.active {
    display: block;
}