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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: #333;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #667eea;
}

.download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.hero {
    padding: 150px 20px 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 80px;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.hero-content {
    flex: 1;
    min-width: 300px;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 15px;
}

.description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 30px;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.primary-btn {
    background: white;
    color: #667eea;
    padding: 15px 35px;
    border-radius: 35px;
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-icon {
    font-size: 18px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.app-mockup {
    background: #1a1a1a;
    border-radius: 50px;
    padding: 15px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.mockup-screen {
    width: 280px;
    height: 600px;
    background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
    border-radius: 45px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.screen-header {
    height: 45px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 10px;
}

.status-bar {
    background: rgba(0, 0, 0, 0.3);
    color: white;
    font-size: 12px;
    padding: 5px 20px;
    border-radius: 20px;
}

.screen-content {
    flex: 1;
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
}

.content-title {
    color: white;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 30px;
    text-align: center;
}

.content-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.item {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: 15px;
    color: white;
    font-size: 16px;
    font-weight: 500;
}

.features, .functions, .feedback, .privacy {
    background: white;
    padding: 80px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.section-subtitle {
    color: #666;
    font-size: 16px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.feature-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
}

.functions-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.function-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    color: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.function-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.function-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.function-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
}

.function-card p {
    font-size: 15px;
    line-height: 1.8;
    opacity: 0.95;
}

.feedback-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    max-width: 800px;
    margin: 0 auto;
}

.feedback-link {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #f8f9fa;
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
}

.feedback-link:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.link-icon {
    font-size: 20px;
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
    background: #f8f9fa;
    padding: 40px;
    border-radius: 20px;
}

.privacy-content ul {
    list-style: none;
}

.privacy-content li {
    position: relative;
    padding-left: 25px;
    padding-bottom: 20px;
    color: #555;
    line-height: 1.8;
}

.privacy-content li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.privacy-content li:last-child {
    padding-bottom: 0;
}

.footer {
    background: #1a1a2e;
    padding: 40px 20px;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer .logo-text {
    color: white;
}

.copyright {
    color: #888;
    font-size: 14px;
}

.footer-link {
    color: #667eea;
    text-decoration: none;
    font-size: 14px;
}

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

.footer-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    font-size: 14px;
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-links .divider {
    color: #555;
}

.beian {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #333;
}

.beian a {
    color: #888;
    text-decoration: none;
    font-size: 12px;
    transition: color 0.3s ease;
}

.beian a:hover {
    color: #667eea;
}

/* 页面通用样式 */
.page-content {
    padding-top: 70px;
}

.page-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 100px 20px 80px;
    text-align: center;
    color: white;
}

.page-hero h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.page-subtitle {
    font-size: 18px;
    opacity: 0.9;
}

/* 功能介绍页面样式 */
.functions-detail {
    background: white;
    padding: 80px 20px;
    max-width: 900px;
    margin: 0 auto;
}

.function-detail-card {
    background: #f8f9fa;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 40px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.function-detail-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.function-header {
    display: flex;
    align-items: center;
    gap: 25px;
    margin-bottom: 30px;
}

.function-icon-large {
    font-size: 64px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    width: 100px;
    height: 100px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.function-info h2 {
    font-size: 28px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.function-tag {
    color: #667eea;
    font-size: 14px;
    font-weight: 500;
}

.function-body > p {
    color: #555;
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 30px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.feature-check {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.feature-text h4 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.feature-text p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

/* 隐私条款页面样式 */
.privacy-detail {
    background: white;
    padding: 80px 20px;
    max-width: 900px;
    margin: 0 auto;
}

.privacy-card {
    background: #f8f9fa;
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.privacy-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.privacy-item {
    display: flex;
    gap: 25px;
    align-items: flex-start;
}

.privacy-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 20px;
    font-weight: 700;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.privacy-text h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.privacy-text p {
    color: #555;
    font-size: 15px;
    line-height: 1.8;
}

.privacy-summary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 20px;
}

.summary-card {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 50px 40px;
    text-align: center;
}

.summary-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.summary-card h2 {
    font-size: 28px;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
}

.summary-list {
    list-style: none;
    text-align: left;
}

.summary-list li {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
    color: #555;
    font-size: 15px;
}

.summary-list li:last-child {
    border-bottom: none;
}

.summary-check {
    color: #667eea;
    font-size: 18px;
    font-weight: bold;
}

/* 行动号召区域 */
.call-to-action {
    background: #f8f9fa;
    padding: 80px 20px;
    text-align: center;
}

.call-to-action h2 {
    font-size: 32px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.call-to-action p {
    color: #666;
    font-size: 16px;
    margin-bottom: 30px;
}

/* 功能预览区域 */
.functions-preview {
    background: white;
    padding: 80px 20px;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 800px;
    margin: 0 auto 40px;
}

.preview-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.preview-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.preview-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.preview-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.preview-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.6;
}

.view-more-btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.view-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        flex-direction: column;
        text-align: center;
        gap: 50px;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .description {
        margin-left: auto;
        margin-right: auto;
    }

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

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

    .feedback-links {
        flex-direction: column;
        align-items: center;
    }

    .feedback-link {
        width: 100%;
        justify-content: center;
        max-width: 300px;
    }

    .page-hero h1 {
        font-size: 32px;
    }

    .function-header {
        flex-direction: column;
        text-align: center;
    }

    .function-icon-large {
        width: 80px;
        height: 80px;
        font-size: 48px;
    }

    .privacy-item {
        flex-direction: column;
        text-align: center;
    }

    .privacy-number {
        margin: 0 auto;
    }

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

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

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}