:root {
    --primary: #f0b90b;
    --primary-dark: #d4a306;
    --dark: #1e2026;
    --darker: #0b0e11;
    --gray: #eaecef;
    --light: #f5f7fa;
    --text: #1e2329;
    --text-light: #707a8a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--text);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: var(--darker);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
}

.logo h1 {
    color: white;
    font-size: 1.5rem;
    margin-left: 10px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary);
}

.download-btn {
    background-color: var(--primary);
    color: var(--darker);
    padding: 8px 20px;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: var(--primary-dark);
}

/* 主横幅区域 */
.hero {
    background: linear-gradient(135deg, var(--darker) 0%, #2a2e39 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: var(--gray);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.app-badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.badge {
    display: inline-block;
    background: var(--dark);
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    color: white;
    font-weight: 600;
    transition: transform 0.3s, background 0.3s;
}

.badge:hover {
    transform: translateY(-5px);
    background: rgba(0,0,0,0.3);
}

.badge i {
    margin-right: 10px;
    font-size: 1.5rem;
    vertical-align: middle;
}

/* 内容区域 */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-header p {
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* 币安介绍 */
.intro-content {
    display: flex;
    align-items: center;
    gap: 50px;
}

.intro-text {
    flex: 1;
}

.intro-image {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

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

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* App截图 */
.screenshots {
    background-color: var(--gray);
}

.screenshot-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.screenshot {
    width: 220px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    transition: transform 0.3s;
}

.screenshot:hover {
    transform: scale(1.05);
}

.screenshot img {
    width: 100%;
    height: auto;
    display: block;
}

/* 下载区域 */
.download-section {
    background: linear-gradient(to bottom, #f8f9fa, #e9ecef);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.download-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
    padding: 40px 30px;
}

.download-card i {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.android i {
    color: #3DDC84;
}

.ios i {
    color: #000000;
}

.download-info {
    margin: 25px 0;
}

.download-info div {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--gray);
}

.download-btn-large {
    display: block;
    background: var(--primary);
    color: var(--darker);
    padding: 15px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    margin-top: 20px;
    transition: background 0.3s;
}

.download-btn-large:hover {
    background: var(--primary-dark);
}

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

.faq-item {
    background: white;
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

.faq-question {
    padding: 20px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s, padding 0.3s;
}

.faq-item.active .faq-answer {
    padding: 0 20px 20px;
    max-height: 500px;
}

/* 公告区域 */
.announcements {
    background-color: var(--gray);
}

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

.announcement-item {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}

.announcement-date {
    background: var(--primary);
    color: var(--darker);
    border-radius: 5px;
    padding: 8px 15px;
    font-weight: 600;
    margin-right: 20px;
    min-width: 100px;
    text-align: center;
}

.announcement-title {
    font-weight: 600;
    flex: 1;
}

/* 页脚 */
footer {
    background: var(--darker);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-column h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--primary);
}

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

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

.footer-column ul li a {
    color: #a6b0c3;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column ul li a:hover {
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: white;
    text-decoration: none;
    transition: background 0.3s;
}

.social-links a:hover {
    background: var(--primary);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #a6b0c3;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    nav ul {
        margin-top: 15px;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 10px;
    }
    
    .intro-content {
        flex-direction: column;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .app-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .download-cards {
        grid-template-columns: 1fr;
    }
}

.announcement-title a {
    color: #1e2026 !important;
    text-decoration: none; /* 可选：移除下划线 */
}

/* 鼠标悬停状态 */
.announcement-title a:hover {
    color: #1e2026 !important; 
    text-decoration: underline; /* 可选：添加悬停下划线 */
}

/* 访问过的链接 */
.announcement-title a:visited {
    color: #1e2026 !important;
}