:root {
    --primary-color: #0d1117;
    --secondary-color: #161b22;
    --card-bg: #1c2128;
    --border-color: #30363d;
    --text-color: #e6edf3;
    --text-muted: #8b949e;
    --accent-color: #e94560;
    --accent-hover: #d63d56;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--primary-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.header {
    background-color: var(--secondary-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo h1 {
    color: var(--accent-color);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-color);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 0;
    min-width: 180px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

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

.dropdown-menu a {
    display: block;
    padding: 0.5rem 0;
}

.language-switch {
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover,
.lang-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: 0.3s;
}

.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.features {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
}

.home-banner {
    padding: 2rem 0;
}

.banner-image {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-color), #d63d56);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    font-weight: bold;
}

.feature-card h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
}

.latest-news {
    padding: 4rem 0;
    background-color: var(--secondary-color);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.news-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.news-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.news-date {
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.news-card .desc-preview {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #d63d56;
}

.cta {
    padding: 4rem 0;
    background-color: var(--secondary-color);
    text-align: center;
}

.cta h2 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.cta p {
    margin-bottom: 2rem;
    color: var(--text-muted);
}

.page-header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
    padding: 3rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-muted);
}

.research-content {
    padding: 3rem 0;
}

.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.research-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.research-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.research-badge {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.research-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.research-card .desc-preview {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.research-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.page-btn {
    padding: 0.5rem 1rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.page-btn:hover,
.page-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.detail-content {
    padding: 3rem 0;
}

.detail-header {
    margin-bottom: 2rem;
}

.detail-header h1 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.detail-meta {
    display: flex;
    gap: 2rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.detail-cover {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.detail-desc {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.detail-desc h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.detail-desc p {
    color: var(--text-color);
    line-height: 1.8;
}

.preview-section {
    margin-bottom: 2rem;
}

.preview-section h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.preview-images {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-images img {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.download-btn {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--border-color);
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: not-allowed;
    opacity: 0.6;
    margin-bottom: 2rem;
}

.vip-promo {
    background: linear-gradient(135deg, var(--accent-color), #d63d56);
    padding: 3rem;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 2rem;
}

.vip-promo h3 {
    font-size: 1.5rem;
    color: white;
    margin-bottom: 1rem;
}

.vip-promo p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: white;
    color: var(--accent-color);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.vip-contact {
    padding: 4rem 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.contact-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.contact-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    display: block;
}

.copyable {
    cursor: pointer;
    position: relative;
}

.copyable:hover {
    text-decoration: underline;
}

.copyable::after {
    content: '📋';
    margin-left: 0.5rem;
    font-size: 0.9rem;
}

.copy-success {
    animation: pulse 0.5s ease;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.vip-benefits {
    padding: 4rem 0;
    background-color: var(--secondary-color);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.benefit-card p {
    color: var(--text-muted);
}

.back-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.btn-secondary {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.banks-list {
    padding: 4rem 0;
}

.banks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.bank-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.bank-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.bank-logo {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.bank-card h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.bank-chinese {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.bank-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer {
    background-color: var(--secondary-color);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-section h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.footer-section h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--text-muted);
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background-color: var(--secondary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 1rem 0;
    }

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

    .hamburger {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        display: none;
        background-color: var(--card-bg);
        border: none;
        box-shadow: none;
        padding-left: 1rem;
    }

    .dropdown:hover .dropdown-menu {
        display: block;
    }

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

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

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

    .detail-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

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

    .vip-promo {
        padding: 2rem 1rem;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}