/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

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

.nav-logo h2 {
    color: #2563eb;
    font-weight: 700;
    font-size: 1.5rem;
}

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

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

.nav-link:hover {
    color: #2563eb;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #fff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #e0e7ff;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #c7d2fe;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

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

.app-mockup {
    width: 300px;
    height: 600px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-app-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.app-mockup i {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.8);
}

/* 功能特色 */
.features {
    padding: 80px 0;
    background: #f8fafc;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.feature-card p {
    color: #64748b;
    line-height: 1.6;
}

/* 应用截图展示 */
.app-screenshots {
    padding: 80px 0;
    background: #f8fafc;
}

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

.screenshot-item {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.screenshot-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.screenshot-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.screenshot-item:hover .screenshot-image {
    transform: scale(1.05);
}

/* 支持语言 */
.languages {
    padding: 80px 0;
    background: white;
}

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

.language-category {
    text-align: center;
}

.language-category h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.language-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.language-tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.language-tag:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* 下载区域 */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.section-subtitle {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    color: #e0e7ff;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    color: white;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    min-width: 200px;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.download-btn i {
    font-size: 2rem;
}

.download-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.download-label {
    font-weight: 600;
    font-size: 1.1rem;
}

.download-subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 支持区域 */
.support {
    padding: 80px 0;
    background: #f8fafc;
}

.support-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.support-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: white;
    border-radius: 8px;
    text-decoration: none;
    color: #1e293b;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.support-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    color: #2563eb;
}

/* 法律页面样式 */
.legal-content {
    padding: 120px 0 80px;
    background: #f8fafc;
    min-height: 100vh;
}

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

.legal-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.legal-subtitle {
    font-size: 1.2rem;
    color: #64748b;
    font-weight: 500;
}

.legal-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.legal-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 0.5rem;
}

.legal-section p {
    color: #374151;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.legal-section ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.legal-section li {
    color: #374151;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.legal-section a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.legal-section a:hover {
    text-decoration: underline;
}

/* 支持页面样式 */
.support-content {
    padding: 120px 0 80px;
    background: #f8fafc;
    min-height: 100vh;
}

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

.support-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.support-subtitle {
    font-size: 1.2rem;
    color: #64748b;
    font-weight: 500;
}

.support-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.support-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.support-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.support-icon i {
    font-size: 2rem;
    color: white;
}

.support-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 1rem;
}

.support-card p {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.support-card ul {
    text-align: left;
    margin: 1rem 0;
    padding-left: 2rem;
}

.support-card li {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.contact-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    color: white;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.contact-icon i {
    font-size: 1.5rem;
    color: white;
}

.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.contact-card a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
}

.contact-card a:hover {
    text-decoration: underline;
}

.contact-note {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 1rem;
}

.faq-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 3rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.faq-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 2rem;
    text-align: center;
}

.faq-item {
    border-bottom: 1px solid #e2e8f0;
    padding: 1.5rem 0;
}

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

.faq-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0.5rem;
}

.faq-item p {
    color: #64748b;
    line-height: 1.6;
}

.download-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.download-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 2rem;
}

/* 应用预览区域 */
.app-preview-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 3rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.app-preview-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 2rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.preview-item {
    background: #f8fafc;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.preview-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.preview-image {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease;
}

.preview-item:hover .preview-image {
    transform: scale(1.02);
}

/* 导航栏激活状态 */
.nav-link.active {
    color: #2563eb;
    font-weight: 600;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .app-mockup {
        width: 250px;
        height: 500px;
    }

    .section-title {
        font-size: 2rem;
    }

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

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

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

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

    .support-section {
        grid-template-columns: 1fr;
    }

    .legal-section {
        padding: 1.5rem;
    }

    .support-card,
    .contact-card {
        padding: 1.5rem;
    }

    .screenshots-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .hero-app-image {
        border-radius: 15px;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .app-mockup {
        width: 200px;
        height: 400px;
    }

    .app-mockup i {
        font-size: 3rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.language-category,
.download-btn {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动平滑 */
html {
    scroll-behavior: smooth;
}