/* w7 - 现代商务风格 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --accent-color: #fbbc04;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --text-dark: #202124;
    --text-gray: #5f6368;
    --border-color: #e8eaed;
}

body {
    font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 顶部通知栏 */
.top-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 5%;
    text-align: center;
    position: relative;
}

.banner-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.banner-close {
    position: absolute;
    right: 5%;
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 10px;
}

/* 导航栏 */
.header-modern {
    background: var(--bg-white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 5%;
}

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

.header-left {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-symbol {
    font-size: 2rem;
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

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

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

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

.header-right {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn-header-login {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.6rem 1.5rem;
    border-radius: 24px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

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

.btn-header-register {
    background: var(--primary-color);
    border: none;
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 24px;
    cursor: pointer;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(26, 115, 232, 0.3);
    transition: all 0.3s;
}

.btn-header-register:hover {
    background: #1557b0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.4);
}

.btn-lang {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.6rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    color: var(--text-gray);
}

/* Hero区域 */
.hero-section-large {
    background: linear-gradient(135deg, #e8f0fe 0%, #fef7e0 100%);
    padding: 80px 5% 100px;
    position: relative;
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    background-image: repeating-linear-gradient(45deg, var(--primary-color) 0, var(--primary-color) 1px, transparent 0, transparent 50%);
    background-size: 10px 10px;
}

.hero-content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-text-area h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    padding: 0.5rem 1.2rem;
    border-radius: 24px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    font-size: 0.95rem;
    color: var(--text-gray);
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-subtext {
    font-size: 1.15rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: white;
    padding: 1.2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.3s;
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.highlight-icon {
    font-size: 2rem;
}

.highlight-content h4 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.highlight-content p {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.hero-cta-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn-hero-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(26, 115, 232, 0.3);
    transition: all 0.3s;
}

.btn-hero-primary:hover {
    background: #1557b0;
    transform: translateY(-3px);
    box-shadow: 0 6px 24px rgba(26, 115, 232, 0.4);
}

.btn-hero-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 1rem 2.5rem;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-hero-secondary:hover {
    background: var(--bg-light);
}

.trust-badges {
    display: flex;
    gap: 2rem;
    color: var(--text-gray);
    font-size: 0.95rem;
}

.trust-badges span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 统计数据 */
.stats-container {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-box-fancy {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    text-align: center;
    transition: all 0.3s;
}

.stat-box-fancy:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-plus {
    color: var(--secondary-color);
}

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-gray);
}

/* 实时交易演示 */
.live-trading-demo {
    background: white;
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.live-trading-demo h4 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.trading-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
}

.trading-item:last-child {
    border-bottom: none;
}

.coin-pair {
    font-weight: 600;
    color: var(--text-dark);
}

.coin-price {
    font-weight: 600;
    color: var(--text-dark);
}

.coin-change {
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

.coin-change.up {
    background: #e6f4ea;
    color: var(--secondary-color);
}

.coin-change.down {
    background: #fce8e6;
    color: #ea4335;
}

/* 交易产品区域 */
.trading-products {
    padding: 100px 5%;
    background: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-tag.light {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.section-title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-desc {
    font-size: 1.15rem;
    color: var(--text-gray);
}

.products-grid-enhanced {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.product-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.3s;
    position: relative;
}

.product-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 32px rgba(26, 115, 232, 0.15);
    transform: translateY(-5px);
}

.featured-card {
    border-color: var(--primary-color);
    box-shadow: 0 8px 32px rgba(26, 115, 232, 0.15);
}

.product-badge-hot {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #ea4335, #fbbc04);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
}

.product-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.product-icon {
    font-size: 2.5rem;
}

.product-icon.large {
    font-size: 3rem;
}

.product-header h3 {
    font-size: 1.6rem;
    color: var(--text-dark);
}

.product-description {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.product-features-list {
    margin-bottom: 2rem;
}

.feature-row {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    margin-bottom: 0.8rem;
    color: var(--text-gray);
}

.check-icon {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.product-stats-bar {
    display: flex;
    gap: 2rem;
    padding: 1.5rem 0;
    margin-bottom: 1.5rem;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-mini {
    display: flex;
    flex-direction: column;
}

.stat-mini strong {
    font-size: 1.4rem;
    color: var(--primary-color);
}

.stat-mini span {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.btn-product-action {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-product-action:hover {
    background: #1557b0;
    transform: translateY(-2px);
}

/* 理财区域 */
.earn-section {
    padding: 100px 5%;
    background: linear-gradient(135deg, #e8f0fe 0%, #fef7e0 100%);
}

.earn-content-wrapper {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    max-width: 1400px;
    margin: 0 auto;
}

.earn-title {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.earn-description {
    font-size: 1.1rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

.earn-options {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.earn-option-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    transition: all 0.3s;
    position: relative;
}

.earn-option-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.earn-option-card.highlighted {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(26, 115, 232, 0.15);
}

.earn-label {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
}

.earn-type {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    color: var(--text-dark);
}

.earn-rate {
    margin-bottom: 1.2rem;
    color: var(--text-gray);
}

.earn-rate strong {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.earn-benefits {
    list-style: none;
    padding: 0;
}

.earn-benefits li {
    padding: 0.5rem 0;
    color: var(--text-gray);
    position: relative;
    padding-left: 1.5rem;
}

.earn-benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: 700;
}

.btn-earn-start {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(26, 115, 232, 0.3);
    transition: all 0.3s;
}

.btn-earn-start:hover {
    background: #1557b0;
    transform: translateY(-3px);
}

/* 收益计算器 */
.earn-calculator {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.earn-calculator h4 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-dark);
}

.calc-input-group {
    margin-bottom: 1.5rem;
}

.calc-input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-gray);
    font-weight: 500;
}

.calc-input,
.calc-select {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
}

.calc-input:focus,
.calc-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.calc-result {
    background: linear-gradient(135deg, #e8f0fe 0%, #fef7e0 100%);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    text-align: center;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.btn-calc {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-calc:hover {
    background: #1557b0;
}

/* 学习中心 */
.learning-hub {
    padding: 100px 5%;
    background: var(--bg-white);
}

.section-header.centered {
    text-align: center;
}

.learning-path-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto 5rem;
}

.learning-path-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    transition: all 0.3s;
}

.learning-path-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    transform: translateY(-5px);
}

.learning-path-card.beginner {
    border-color: var(--secondary-color);
}

.learning-path-card.intermediate {
    border-color: var(--primary-color);
}

.learning-path-card.advanced {
    border-color: var(--accent-color);
}

.path-level {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.level-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

.beginner .level-badge {
    background: var(--secondary-color);
}

.advanced .level-badge {
    background: var(--accent-color);
}

.level-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-gray);
}

.learning-path-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.learning-path-card > p {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.course-list {
    margin-bottom: 2rem;
}

.course-item {
    display: grid;
    grid-template-columns: 50px 1fr 80px;
    gap: 1rem;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.course-item:last-child {
    border-bottom: none;
}

.course-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.course-info h4 {
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
    color: var(--text-dark);
}

.course-info p {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.course-duration {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.btn-learning {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-learning:hover {
    background: #1557b0;
    transform: translateY(-2px);
}

/* 视频区域 */
.video-section {
    margin-top: 5rem;
}

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

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.video-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
    cursor: pointer;
}

.video-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    transform: translateY(-5px);
}

.video-thumbnail {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, #e8f0fe, #fef7e0);
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-play-icon {
    font-size: 3rem;
    color: var(--primary-color);
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.video-card h4 {
    padding: 1rem 1rem 0.5rem;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.video-card > p {
    padding: 0 1rem;
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 1rem;
}

.video-meta {
    padding: 0 1rem 1rem;
    display: flex;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-gray);
}

/* 关于我们 */
.about-section {
    padding: 100px 5%;
    background: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    max-width: 1400px;
    margin: 0 auto;
    align-items: center;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.about-content > p {
    font-size: 1.05rem;
    color: var(--text-gray);
    line-height: 1.9;
    margin-bottom: 1.5rem;
}

.about-features {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.feature-icon-large {
    font-size: 3rem;
}

.about-feature h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.about-feature p {
    color: var(--text-gray);
    line-height: 1.8;
}

.about-stats {
    display: grid;
    gap: 2rem;
}

.stat-item-large {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    text-align: center;
    transition: all 0.3s;
}

.stat-item-large:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* FAQ */
.faq-comprehensive {
    padding: 100px 5%;
    background: var(--bg-white);
}

.faq-grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
    max-width: 1400px;
    margin: 0 auto;
}

.faq-category h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.faq-item-detailed {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

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

.faq-item-detailed summary {
    padding: 1.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-dark);
    list-style: none;
}

.faq-item-detailed summary::-webkit-details-marker {
    display: none;
}

.faq-content {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-gray);
    line-height: 1.8;
}

.faq-content p {
    margin-bottom: 1rem;
}

.faq-content ol,
.faq-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.faq-content li {
    margin-bottom: 0.5rem;
}

.fee-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.fee-table th,
.fee-table td {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.fee-table th {
    background: var(--bg-light);
    font-weight: 600;
}

/* APP下载 */
.app-section-fancy {
    padding: 100px 5%;
    background: linear-gradient(135deg, #e8f0fe 0%, #fef7e0 100%);
}

.app-wrapper {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    max-width: 1400px;
    margin: 0 auto;
    align-items: center;
}

.app-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.app-info > p {
    font-size: 1.15rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
}

.app-advantages {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.advantage-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.advantage-icon {
    font-size: 2.5rem;
}

.advantage-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--text-dark);
}

.advantage-item p {
    font-size: 0.9rem;
    color: var(--text-gray);
}

.app-download-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.download-option {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.download-option:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    transform: translateY(-3px);
}

.download-icon {
    font-size: 2rem;
}

.download-text small {
    display: block;
    font-size: 0.7rem;
    color: var(--text-gray);
}

.download-text strong {
    font-size: 0.95rem;
    color: var(--text-dark);
}

.qr-download {
    text-align: center;
}

.qr-code-display {
    background: white;
    width: 150px;
    height: 150px;
    margin: 0 auto 1rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border-color);
}

.qr-placeholder {
    font-size: 3rem;
    color: var(--text-gray);
}

/* 手机预览 */
.phone-mockup-fancy {
    background: white;
    padding: 1.5rem;
    border-radius: 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.phone-screen {
    background: linear-gradient(135deg, #e8f0fe, #fef7e0);
    height: 600px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screen-content {
    font-size: 6rem;
}

/* Footer */
.footer-modern {
    background: var(--text-dark);
    color: white;
    padding: 60px 5% 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    max-width: 1400px;
    margin: 0 auto 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-logo-symbol {
    font-size: 2.5rem;
    color: var(--primary-color);
}

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

.footer-desc {
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.footer-global-stats {
    display: flex;
    gap: 2rem;
}

.global-stat {
    display: flex;
    flex-direction: column;
}

.global-stat strong {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
}

.global-stat span {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: white;
}

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

.footer-column ul li {
    margin-bottom: 0.8rem;
}

.footer-column a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright p {
    color: rgba(255,255,255,0.7);
    margin-bottom: 0.5rem;
}

.disclaimer {
    font-size: 0.85rem;
    max-width: 600px;
}

.footer-social-links {
    display: flex;
    gap: 1.5rem;
}

.social-link {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content-grid,
    .earn-content-wrapper,
    .about-grid,
    .app-wrapper {
        grid-template-columns: 1fr;
    }
    
    .products-grid-enhanced,
    .learning-path-grid,
    .video-grid,
    .faq-grid-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-left {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-text-area h1 {
        font-size: 2rem;
    }
    
    .hero-highlights {
        grid-template-columns: 1fr;
    }
    
    .app-download-options {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
    }
    
    .footer-links-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}