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

:root {
    --primary-color: #3375BB;
    --primary-dark: #2860a0;
    --primary-light: #4a8fd4;
    --secondary-color: #1a1a2e;
    --accent-color: #00d4aa;
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #1a1a2e;
    --border-color: #e5e5e5;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

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

a:hover {
    color: var(--primary-dark);
}

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

ul {
    list-style: none;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--secondary-color);
}

.logo img {
    border-radius: var(--radius-sm);
}

.logo:hover {
    color: var(--primary-color);
}

.nav-list {
    display: flex;
    gap: 32px;
}

.nav-list a {
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-list a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: var(--transition);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4fd 50%, #f5f5f5 100%);
}

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

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.breadcrumb span:not(:last-child)::after {
    content: '>';
    margin-left: 8px;
}

.breadcrumb a {
    color: var(--text-muted);
}

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

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--secondary-color);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.hero-update {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.section {
    padding: 80px 0;
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 20px;
    text-align: center;
}

.section-desc {
    text-align: center;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 48px;
    font-size: 1.05rem;
}

.wallet-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.wallet-content h3 {
    font-size: 1.35rem;
    color: var(--secondary-color);
    margin: 28px 0 16px;
}

.wallet-content p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.wallet-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: #fff;
    padding: 32px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

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

.feature-card img {
    width: 100%;
    max-width: 200px;
    margin: 0 auto 24px;
    border-radius: var(--radius-md);
}

.feature-card h3 {
    font-size: 1.15rem;
    color: var(--secondary-color);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

.download-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    gap: 60px;
    align-items: center;
}

.download-content h3 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin: 28px 0 16px;
}

.download-content p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.download-checklist {
    background: var(--bg-light);
    padding: 24px 32px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.download-checklist li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 12px;
    color: var(--text-light);
}

.download-checklist li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

.download-checklist li:last-child {
    margin-bottom: 0;
}

.download-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 32px;
}

.download-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 40px;
}

.security-item {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.security-item h3 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 16px;
}

.security-item p {
    color: var(--text-light);
    line-height: 1.8;
}

.security-warning {
    background: linear-gradient(135deg, #fff5f5, #fff0f0);
    padding: 40px;
    border-radius: var(--radius-md);
    border-left: 4px solid #e74c3c;
}

.security-warning h3 {
    font-size: 1.25rem;
    color: #c0392b;
    margin-bottom: 16px;
}

.security-warning p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.warning-text {
    background: rgba(231, 76, 60, 0.1);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    color: #c0392b;
    font-weight: 500;
    margin-bottom: 0;
}

.guide-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 48px;
}

.guide-intro p {
    color: var(--text-light);
    font-size: 1.05rem;
}

.guide-steps {
    max-width: 900px;
    margin: 0 auto;
}

.guide-step {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    padding: 32px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-light);
    line-height: 1.8;
}

.guide-cta {
    text-align: center;
    margin-top: 48px;
}

.guide-cta p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    margin-bottom: 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
    padding: 24px 32px;
    cursor: pointer;
    position: relative;
    margin: 0;
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: 32px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    transform: translateY(-50%) rotate(45deg);
}

.faq-answer {
    padding: 0 32px 24px;
    display: none;
}

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

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
}

.trouble-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.trouble-card {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.trouble-card:hover {
    box-shadow: var(--shadow-md);
}

.trouble-card h3 {
    font-size: 1.15rem;
    color: var(--secondary-color);
    margin-bottom: 16px;
}

.trouble-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.8;
}

.trouble-cta {
    text-align: center;
}

.trouble-cta p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.showcase-slider {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.showcase-item {
    flex: 0 0 auto;
}

.showcase-item img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 240px;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 1.05rem;
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    color: var(--text-light);
    margin-bottom: 24px;
    line-height: 1.8;
}

.contact-actions {
    margin: 32px 0;
}

.contact-note {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer {
    background: var(--bg-dark);
    color: #fff;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-brand img {
    border-radius: var(--radius-sm);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
}

.copyright {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.disclaimer {
    color: rgba(255,255,255,0.5);
    font-size: 0.85rem;
    max-width: 800px;
    margin: 0 auto;
}

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 90px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .trouble-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 16px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero-image {
        order: -1;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section h2 {
        font-size: 1.6rem;
    }
    
    .wallet-grid,
    .download-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .wallet-image,
    .download-image {
        order: -1;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .security-grid {
        grid-template-columns: 1fr;
    }
    
    .trouble-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-slider {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 20px;
        justify-content: flex-start;
    }
    
    .showcase-item img {
        max-width: 200px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .back-to-top {
        right: 16px;
        bottom: 80px;
        width: 44px;
        height: 44px;
    }
    
    .guide-step {
        flex-direction: column;
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto;
    }
    
    .faq-question {
        padding: 20px 48px 20px 20px;
        font-size: 1rem;
    }
    
    .faq-question::after {
        right: 20px;
    }
    
    .faq-answer {
        padding: 0 20px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
    
    .btn-large {
        padding: 14px 32px;
        font-size: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .download-actions {
        flex-direction: column;
    }
    
    .feature-card,
    .security-item,
    .trouble-card,
    .guide-step {
        padding: 24px;
    }
    
    .security-warning {
        padding: 24px;
    }
}