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

:root {
    --primary-color: #ffffff;
    --secondary-color: #cccccc;
    --text-color: #ffffff;
    --text-light: #cccccc;
    --bg-color: #000000;
    --accent-color: #007AFF;
    --border-color: #333333;
    --section-padding: 80px 0;
}

html {
    height: 100%;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    background-color: #000000;
    -webkit-tap-highlight-color: transparent;
    overscroll-behavior: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background: linear-gradient(to bottom, #333333, #000000);
    background-color: #000000;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
}

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

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-brand-icon {
    width: 32px;
    height: 32px;
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

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

.nav-menu a:hover {
    color: var(--accent-color);
}

.download-link {
    background-color: #FE9500;
    color: white !important;
    padding: 8px 20px;
    border-radius: 20px;
    transition: background-color 0.3s;
}

.download-link:hover {
    background-color: #d67d00;
}

.language-btn {
    background: none;
    border: none;
    color: var(--text-color);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.3s;
    font-family: inherit;
}

.language-btn:hover {
    color: var(--accent-color);
}

/* 英雄区域 */
.hero {
    padding: 100px 0 60px;
    text-align: center;
    flex: 1;
}

.hero-icon {
    max-width: 180px;
    height: auto;
    margin-bottom: 30px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--primary-color);
    line-height: 1.2;
}

.hero-device {
    max-width: 100%;
    width: 100%;
    max-width: 450px;
    height: auto;
    margin: 0 auto 40px;
    display: block;
}

.hero-subtitle-first {
    font-size: 20px;
    color: var(--text-light);
    max-width: 900px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-light);
    max-width: 900px;
    margin: 0 auto 30px;
    line-height: 1.8;
}

.getting-started-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: none;
    border: none;
    color: #007AFF;
    padding: 0;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: color 0.3s;
}

.getting-started-btn:hover {
    color: #0051D5;
}

.arrow-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid #007AFF;
    font-size: 18px;
    transition: border-color 0.3s, background-color 0.3s;
}

.getting-started-btn:hover .arrow-icon {
    border-color: #0051D5;
    background-color: rgba(0, 122, 255, 0.1);
}

/* 徽章区域 */
.badges {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.badges .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.badge-item {
    padding: 8px 16px;
    background-color: #f5f5f5;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-color);
    font-weight: 500;
}

/* 主要标题 */
.main-heading {
    padding: var(--section-padding);
    text-align: center;
}

.heading-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.heading-description {
    font-size: 18px;
    color: var(--text-light);
    max-width: 800px;
    margin: 30px auto 0;
    line-height: 1.8;
}

/* 使用场景 */
.use-cases {
    padding: 60px 0;
    background-color: #f9f9f9;
}

.section-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 40px;
    text-align: center;
    color: var(--primary-color);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.use-case-item {
    padding: 30px;
    background-color: white;
    border-radius: 12px;
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.use-case-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* 工具功能 */
.tools {
    padding: var(--section-padding);
}

.tools .section-title {
    margin-bottom: 60px;
}

.tool-item {
    margin-bottom: 80px;
    padding: 40px;
    background-color: #f9f9f9;
    border-radius: 16px;
}

.tool-item:last-child {
    margin-bottom: 0;
}

.tool-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.tool-description {
    font-size: 18px;
    color: var(--text-color);
    margin-bottom: 15px;
    line-height: 1.8;
}

.tool-details {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.8;
}

.tool-tagline {
    font-size: 16px;
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 25px;
    line-height: 1.8;
}

.tool-item em {
    font-style: italic;
    color: var(--primary-color);
}

.download-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.3s;
}

.download-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.download-btn.large {
    padding: 16px 40px;
    font-size: 18px;
}

/* 用户评价 */
.testimonials {
    padding: var(--section-padding);
    background-color: #f9f9f9;
}

.testimonials-intro {
    font-size: 18px;
    color: var(--text-light);
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
    line-height: 1.8;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-item {
    padding: 30px;
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.testimonial-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.testimonial-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.testimonial-author {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-color);
}

.testimonial-role {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.testimonial-text {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

/* 详细使用场景 */
.detailed-use-cases {
    padding: var(--section-padding);
}

.detailed-use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.detailed-use-case-item {
    padding: 30px;
    background-color: #f9f9f9;
    border-radius: 12px;
    transition: transform 0.3s, background-color 0.3s;
}

.detailed-use-case-item:hover {
    transform: translateY(-5px);
    background-color: #f0f0f0;
}

.detailed-use-case-item h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.detailed-use-case-item p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

/* 最终 CTA */
.final-cta {
    padding: var(--section-padding);
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.cta-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

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

.final-cta .download-btn:hover {
    background-color: #f0f0f0;
}

/* 页脚 */
.footer {
    padding: 60px 0 40px;
    background-color: #000000;
    color: white;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 25px;
    margin-bottom: 15px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-copyright {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 12px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .heading-title {
        font-size: 32px;
    }

    .section-title {
        font-size: 24px;
    }

    .tool-title {
        font-size: 24px;
    }

    .nav-menu {
        gap: 15px;
        font-size: 14px;
    }

    .cta-title {
        font-size: 32px;
    }

    .testimonials-grid,
    .detailed-use-cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0 40px;
    }

    .hero-title {
        font-size: 28px;
    }

    .nav-menu {
        gap: 10px;
        font-size: 13px;
    }

    .nav-menu a,
    .language-btn {
        padding: 6px 12px;
        font-size: 13px;
    }

    .download-link {
        padding: 6px 16px;
        font-size: 13px;
    }

    .badges .container {
        gap: 10px;
    }

    .badge-item {
        font-size: 12px;
        padding: 6px 12px;
    }
}