/* Global Styles */
:root {
    --primary-color: #02C1A5; /* OKX品牌色 - 蓝绿色 */
    --secondary-color: #0ECFE1; /* 次要品牌色 */
    --accent-color: #FCD535; /* 强调色 - 黄色 */
    --text-color: #f8f8f8;
    --light-text: #fff;
    --dark-text: #333;
    --light-bg: #1E2329; /* 浅色背景，但实际是深色 */
    --dark-bg: #0B0E11; /* 主要深色背景 */
    --medium-bg: #171D24; /* 中间色背景 */
    --border-color: #292D33;
    --success-color: #02C1A5;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* 确保锚点定位时不被固定导航栏遮挡 */
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

section {
    padding: 80px 0;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: 2.8rem;
}

h2 {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 40px;
}

h3 {
    font-size: 1.8rem;
}

p {
    margin-bottom: 15px;
}

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

a:hover {
    color: var(--secondary-color);
}

img {
    max-width: 100%;
    height: auto;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--dark-text);
    box-shadow: 0 4px 15px rgba(2, 193, 165, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(2, 193, 165, 0.4);
    background: var(--secondary-color);
    color: var(--dark-text);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

/* Navbar */
.navbar {
    background-color: var(--dark-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px 0;
}

.navbar.navbar-scrolled {
    background-color: rgba(11, 14, 17, 0.95);
    backdrop-filter: blur(10px);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-accent {
    color: var(--light-text);
    opacity: 0.9;
    font-weight: 400;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}

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

.language-toggle {
    display: flex;
    align-items: center;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    margin-left: 10px;
    padding: 5px 10px;
    border-radius: 4px;
    font-weight: 500;
    color: var(--text-color);
}

.lang-btn.active {
    background-color: var(--primary-color);
    color: var(--dark-text);
}

/* Mobile Navigation */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    background: none;
    border: none;
}

/* Hero Section */
#hero {
    padding-top: 150px;
    padding-bottom: 80px;
    background: radial-gradient(ellipse at top, var(--light-bg) 0%, var(--dark-bg) 70%);
}

#hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: 50px;
}

.hero-image {
    flex: 1;
}

.hero-content h1 {
    color: var(--light-text);
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #b6b6b6;
}

/* Logos Section */
#logos {
    background-color: var(--medium-bg);
    padding: 60px 0;
}

.exchange-logos {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    align-items: center;
    margin-top: 40px;
}

.exchange-item {
    text-align: center;
    margin: 20px;
    transition: var(--transition);
}

.exchange-item img {
    margin-bottom: 15px;
    opacity: 0.8;
    transition: var(--transition);
}

.exchange-item:hover img {
    opacity: 1;
    transform: scale(1.05);
}

.exchange-item .btn {
    margin-top: 10px;
}

/* Benefits Section */
#benefits {
    background-color: var(--dark-bg);
}

.benefits-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.fee-comparison {
    flex: 1;
    min-width: 300px;
}

.benefits-list {
    flex: 1;
    min-width: 300px;
}

.comparison-chart {
    display: flex;
    background-color: var(--medium-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    margin: 30px 0;
}

.standard-rate, .our-rate {
    flex: 1;
    padding: 20px;
    text-align: center;
}

.standard-rate {
    background-color: var(--light-bg);
}

.our-rate {
    background-color: rgba(2, 193, 165, 0.1);
}

.rate-label {
    font-weight: 500;
    margin-bottom: 10px;
}

.rate-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.our-rate .rate-value {
    color: var(--success-color);
}

.benefit-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.benefit-item i {
    color: var(--success-color);
    font-size: 1.5rem;
    margin-right: 15px;
}

/* Exchange Cards Section */
#exchanges {
    background-color: var(--medium-bg);
}

.exchange-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.exchange-card {
    background-color: var(--light-bg);
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: var(--transition);
    max-width: 350px;
    width: 100%;
    border: 1px solid var(--border-color);
}

.exchange-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    border-color: var(--primary-color);
}

.card-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(11, 14, 17, 0.4);
}

.card-header img {
    margin-bottom: 15px;
}

.card-body {
    padding: 20px;
}

.discount-info {
    margin-bottom: 20px;
}

.discount-badge {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--dark-text);
    padding: 5px 10px;
    border-radius: 5px;
    font-weight: 700;
    margin-bottom: 15px;
}

.bonus-info {
    margin-bottom: 20px;
}

.bonus-info h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.exchange-card .btn {
    width: 100%;
}

/* Testimonials Section */
#testimonials {
    background-color: var(--dark-bg);
}

.testimonial-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
    margin-bottom: 50px;
}

.testimonial-card {
    background-color: var(--light-bg);
    border-radius: 10px;
    box-shadow: var(--card-shadow);
    padding: 25px;
    max-width: 350px;
    width: 100%;
    display: flex;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    border-color: var(--primary-color);
}

.testimonial-avatar {
    margin-right: 15px;
}

.testimonial-avatar img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-content {
    flex: 1;
}

.testimonial-rating {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.testimonial-author {
    margin-top: 15px;
    font-size: 0.9rem;
}

.testimonial-author .name {
    font-weight: 600;
    display: block;
    color: var(--primary-color);
}

.testimonial-author .date {
    color: #777;
}

.verification-images h3 {
    text-align: center;
    margin-bottom: 30px;
}

.image-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.image-grid img {
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.image-grid img:hover {
    transform: scale(1.05);
    border-color: var(--primary-color);
}

/* FAQ Section */
#faq {
    background-color: var(--medium-bg);
}

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

.faq-item {
    background-color: var(--light-bg);
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

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

.faq-question h3 {
    margin-bottom: 0;
    font-size: 1.2rem;
}

.faq-toggle {
    color: var(--primary-color);
}

.faq-answer {
    padding: 0 20px 20px;
    display: none;
    color: #b6b6b6;
}

.faq-item.active {
    border-color: var(--primary-color);
}

.faq-item.active .faq-answer {
    display: block;
}

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

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: #fff;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo, .footer-links, .footer-social {
    margin-bottom: 30px;
}

.footer-logo h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

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

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

.footer-links a {
    color: #bbb;
}

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

.social-icons {
    display: flex;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--light-text);
    border-radius: 50%;
    margin-right: 10px;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: var(--primary-color);
    color: var(--dark-text);
    transform: translateY(-3px);
}

.footer-disclaimer {
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    margin-bottom: 30px;
}

.footer-disclaimer h4 {
    margin-bottom: 15px;
    color: var(--light-text);
}

.footer-disclaimer p {
    color: #bbb;
    font-size: 0.9rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: #bbb;
    font-size: 0.9rem;
}

.footer-policies a {
    color: #bbb;
    margin-left: 15px;
}

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

/* Mobile Navigation Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--dark-bg);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    padding: 20px 0;
    z-index: 999;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-10px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu li {
    padding: 12px 25px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.mobile-menu a {
    color: var(--text-color);
    font-size: 1.1rem;
    display: block;
}

.mobile-menu a:hover {
    color: var(--primary-color);
}

.mobile-language {
    display: flex;
    justify-content: center;
    padding: 15px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 10px;
}

.mobile-menu.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 992px) {
    h1 {
        font-size: 2.4rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    #hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }
    
    .footer-content > div {
        flex: 0 0 calc(50% - 20px);
    }
    
    .exchange-card {
        max-width: 320px;
    }
    
    .testimonial-card {
        max-width: 320px;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    section {
        padding: 60px 0;
    }
    
    .nav-links {
        display: none;
    }
    
    .language-toggle {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .footer-content > div {
        flex: 0 0 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-policies {
        margin-top: 15px;
    }
    
    .footer-policies a {
        margin: 0 10px;
    }
    
    .testimonial-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .testimonial-avatar {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .testimonial-rating {
        justify-content: center;
        display: flex;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    #hero {
        padding-top: 120px;
    }
    
    .exchange-item {
        flex: 0 0 100%;
        margin: 10px 0;
    }
    
    .faq-question h3 {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
        margin-bottom: 25px;
    }
    
    section {
        padding: 40px 0;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .rate-value {
        font-size: 1.5rem;
    }
    
    .btn {
        font-size: 0.9rem;
        padding: 8px 16px;
    }
    
    .footer-disclaimer p {
        font-size: 0.8rem;
    }
    
    .image-grid {
        gap: 10px;
    }
    
    .image-grid img {
        width: 100%;
        max-width: 280px;
    }
    
    .benefit-item i {
        font-size: 1.2rem;
    }
    
    .benefit-item p {
        font-size: 0.9rem;
    }
}