/* 基础样式和重置 */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #7c3aed;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn svg {
    margin-left: 0.5rem;
}

/* 头部导航 */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo img {
    margin-right: 0.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-item.active .nav-link {
    color: var(--primary-color);
}

.nav-item.active .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 1px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.mobile-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

/* 英雄区域 */
.hero-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin: 2rem 0;
}

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

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

.stat-text {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
}

.app-badges {
    display: flex;
    gap: 1rem;
}

.app-badge img {
    transition: transform 0.2s ease;
}

.app-badge:hover img {
    transform: translateY(-2px);
}

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

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 100%;
    height: auto;
}

/* 特性区域 */
.features-section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 36rem;
    margin: 0 auto;
}

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

.feature-card {
    padding: 2rem;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.feature-icon img {
    width: 32px;
    height: 32px;
    filter: brightness(0) invert(1);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 流程区域 */
.process-section {
    padding: 5rem 0;
    background-color: var(--bg-light);
}

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

.process-step {
    padding: 2rem;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    position: relative;
    border: 1px solid var(--border-color);
}

.step-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.2;
    margin-bottom: 1rem;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.step-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.step-link:hover {
    text-decoration: underline;
}

/* 新闻推荐区域 */
.news-section {
    padding: 5rem 0;
    background-color: var(--bg-white);
}

.news-section .section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 3rem;
    text-align: left;
}

.news-section .section-description {
    margin: 0;
    max-width: none;
}

.section-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.section-link:hover {
    text-decoration: underline;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.news-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.news-card:hover::after {
    transform: scaleX(1);
}

.news-image {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
    opacity: 0.2;
}

.news-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 2;
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    display: block;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.news-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.news-card:hover .news-title {
    color: var(--primary-color);
}

.news-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.meta-item::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background-color: var(--text-light);
    border-radius: 50%;
}

.meta-item:first-child::before {
    display: none;
}

.news-list {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.list-news-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
    cursor: pointer;
}

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

.list-news-item:hover {
    background-color: var(--bg-light);
    padding-left: 2rem;
}

.list-news-item:hover .list-title {
    color: var(--primary-color);
}

.list-date {
    font-size: 0.875rem;
    color: var(--text-light);
    min-width: 60px;
    font-weight: 500;
}

.list-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.list-title {
    font-size: 1rem;
    font-weight: 500;
    margin: 0;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.list-category {
    font-size: 0.75rem;
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* 下载CTA区域 */
.download-cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.cta-content {
    max-width: 36rem;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

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

.download-cta .btn-primary:hover {
    background-color: var(--bg-light);
}

/* 页脚 */
.footer {
    background-color: #111827;
    color: #d1d5db;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-logo img {
    margin-right: 0.5rem;
}

.footer-description {
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    transition: all 0.2s ease;
}

.social-link:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.link-group-title {
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.link-list {
    list-style: none;
}

.link-list li {
    margin-bottom: 0.75rem;
}

.link-list a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.2s ease;
}

.link-list a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    opacity: 0.7;
}

.footer-bottom-links {
    display: flex;
    gap: 2rem;
}

.footer-bottom-links a {
    color: #9ca3af;
    text-decoration: none;
    font-size: 0.875rem;
}

.footer-bottom-links a:hover {
    color: white;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-card {
    animation: fadeInUp 0.6s ease forwards;
}

.news-card:nth-child(1) {
    animation-delay: 0.1s;
}

.news-card:nth-child(2) {
    animation-delay: 0.2s;
}

.news-card:nth-child(3) {
    animation-delay: 0.3s;
}

.list-news-item {
    animation: fadeInUp 0.6s ease forwards;
}

.list-news-item:nth-child(1) {
    animation-delay: 0.4s;
}

.list-news-item:nth-child(2) {
    animation-delay: 0.5s;
}

.list-news-item:nth-child(3) {
    animation-delay: 0.6s;
}

.list-news-item:nth-child(4) {
    animation-delay: 0.7s;
}

/* 法律页面样式 */
.legal-content {
    padding: 3rem 0 5rem;
    background-color: var(--bg-light);
}

.legal-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.legal-header .page-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.legal-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.legal-body {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-white);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.notice-box {
    background-color: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.notice-box.important {
    background-color: #fee2e2;
    border-color: #fca5a5;
}

.notice-box p {
    margin: 0;
    color: #7c2d12;
}

.notice-box.important p {
    color: #7f1d1d;
}

.legal-section {
    margin-bottom: 2.5rem;
}

.legal-section h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.legal-section h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin: 1.5rem 0 0.75rem;
}

.legal-section p {
    margin-bottom: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.legal-section ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.legal-section li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.legal-section li strong {
    color: var(--text-primary);
}

.contact-info {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
}

.contact-info p {
    margin-bottom: 0.5rem;
}

.acceptance-box {
    background-color: #dcfce7;
    border: 1px solid #86efac;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    text-align: center;
    margin-top: 3rem;
}

.acceptance-box p {
    margin: 0;
    color: #166534;
    font-weight: 500;
}

.legal-footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .legal-body {
        padding: 2rem 1.5rem;
    }
    
    .legal-header .page-title {
        font-size: 2rem;
    }
    
    .legal-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 576px) {
    .legal-body {
        padding: 1.5rem;
    }
    
    .legal-section h2 {
        font-size: 1.25rem;
    }
    
    .notice-box,
    .acceptance-box {
        padding: 1rem;
    }
}

/* 动画效果 */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

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

/* 加载动画 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s ease;
}

.page-loader::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid #f3f4f6;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 页面加载完成 */
body.loaded .page-loader {
    opacity: 0;
    pointer-events: none;
}

/* 动画元素 */
.animate-in {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

/* 暗色主题 */
.dark-theme {
    --bg-white: #1f2937;
    --bg-light: #111827;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --primary-color: #3b82f6;
    --primary-dark: #1d4ed8;
}

/* 菜单打开状态 */
body.menu-open {
    overflow: hidden;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: 2rem;
        transition: left 0.3s ease;
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 1rem;
    }
    
    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}