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

:root {
    --primary-color: #1a73e8;
    --primary-dark: #0d47a1;
    --primary-light: #5b9ef5;
    --secondary-color: #34a853;
    --warning-color: #fbbc04;
    --danger-color: #d33b27;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --border-color: #dadce0;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 4px 6px 0 rgba(60, 64, 67, 0.3), 0 8px 16px 5px rgba(60, 64, 67, 0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    font-size: 16px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
    font-size: inherit;
}

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

/* Navigation */
.nav-bar {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0;
    transition: width 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.nav-left {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
}

.nav-logo img {
    height: 32px;
    width: 32px;
}

.nav-title {
    font-size: 18px;
    font-weight: 700;
}

.nav-right {
    flex: 1;
    display: flex;
    gap: 24px;
    justify-content: flex-end;
}

.nav-btn {
    padding: 8px 12px;
    background: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    border-radius: 4px;
    white-space: nowrap;
}

.nav-btn:hover,
.nav-btn.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.nav-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    padding: 8px;
}

.nav-menu-btn span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Mobile Menu */
.mobile-menu-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    z-index: 999;
}

.mobile-menu-panel.active {
    max-height: 400px;
    box-shadow: var(--shadow-lg);
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    padding: 12px 0;
}

.mobile-menu-item {
    padding: 12px 20px;
    background: none;
    color: var(--text-primary);
    text-align: left;
    font-size: 14px;
    transition: background 0.2s ease;
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu-item:hover,
.mobile-menu-item.active {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

/* Main */
main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 60px 20px;
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-left {
    padding: 20px 0;
}

.hero-left h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 16px;
}

.hero-intro {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
    background: var(--bg-primary);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}

.feature-icon {
    font-size: 16px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: rgba(26, 115, 232, 0.1);
}

.hero-safety {
    background: rgba(251, 188, 4, 0.1);
    border-left: 3px solid var(--warning-color);
    padding: 12px 16px;
    border-radius: 4px;
}

.hero-safety strong {
    color: var(--text-primary);
    font-weight: 600;
}

.hero-safety p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.hero-right {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image {
    width: 100%;
    max-width: 400px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-secondary);
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Section Module */
.section-module {
    padding: 60px 20px;
    border-bottom: 1px solid var(--border-color);
}

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

.section-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-module h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 32px;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.card-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Coins Section */
.coins-intro {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    text-align: center;
}

.coins-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.coin-category h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.coin-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.coin-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 6px;
    font-size: 13px;
}

.coin-name {
    font-weight: 500;
    color: var(--text-primary);
}

.coin-symbol {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 12px;
}

.coins-image {
    width: 100%;
    max-width: 500px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.coins-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Networks Section */
.networks-intro {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    text-align: center;
}

.networks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.network-item {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.network-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.network-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.network-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.network-type {
    font-size: 11px;
    padding: 4px 8px;
    background: var(--bg-secondary);
    border-radius: 3px;
    color: var(--primary-color);
    font-weight: 600;
}

.network-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.networks-image {
    width: 100%;
    max-width: 500px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.networks-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Advantages Section */
.advantages-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.advantage-item {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    position: relative;
}

.advantage-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 12px;
}

.advantage-item h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.advantage-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.advantage-image {
    width: 100%;
    max-width: 500px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 32px;
}

.advantage-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Reviews Section */
.reviews-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.review-item {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.reviewer-info {
    display: flex;
    gap: 12px;
    flex-direction: column;
}

.reviewer-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.reviewer-location {
    font-size: 12px;
    color: var(--text-secondary);
}

.review-rating {
    font-size: 13px;
}

.review-text {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Team Section */
.team-intro {
    margin-bottom: 32px;
    text-align: center;
}

.team-intro h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.team-intro p {
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.team-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.value-item {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.value-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.value-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.team-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
    text-align: center;
}

.stat-item {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    margin-bottom: 8px;
}

.stat-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

.team-image {
    width: 100%;
    max-width: 500px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 32px;
}

.team-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Download Section */
.download-section {
    text-align: center;
}

.download-intro {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

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

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 32px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    color: var(--text-primary);
    text-decoration: none;
}

.download-btn:hover {
    border-color: var(--primary-color);
    background: rgba(26, 115, 232, 0.05);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.platform-icon {
    font-size: 28px;
}

.platform-name {
    font-weight: 600;
    font-size: 14px;
}

.platform-hint {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: #9aa0a6;
    padding: 40px 20px 20px;
    margin-top: 60px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-column h4 {
    color: white;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

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

.footer-column li {
    margin-bottom: 8px;
}

.footer-column a {
    color: #9aa0a6;
    font-size: 13px;
    transition: color 0.2s ease;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    font-size: 12px;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 900;
    box-shadow: var(--shadow-md);
}

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

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

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .nav-right {
        display: none;
    }

    .nav-menu-btn {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .hero-left h1 {
        font-size: 24px;
    }

    .hero-features {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .coins-list {
        grid-template-columns: 1fr;
    }

    .networks-grid {
        grid-template-columns: 1fr;
    }

    .advantages-content {
        grid-template-columns: 1fr;
    }

    .reviews-content {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        flex-direction: column;
    }

    .mobile-menu-panel.active {
        max-height: 100vh;
    }
}

@media (max-width: 480px) {
    .section-module {
        padding: 40px 16px;
    }

    .section-module h2 {
        font-size: 20px;
    }

    .hero-section {
        padding: 40px 16px;
    }

    .hero-left h1 {
        font-size: 20px;
    }

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