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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #0f172a;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --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);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

.nav-links a:hover {
    color: var(--primary-color);
    background: var(--bg-light);
}

.nav-links a.active {
    color: var(--primary-color);
    background: var(--bg-light);
}

/* Hero 区域 */
.hero {
    padding: 70px 0 50px;
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    color: white;
    min-height: 55vh;
    display: flex;
    align-items: center;
}

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

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.8;
}

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

.hero-image {
    animation: fadeInRight 0.8s ease;
}

.hero-screenshot {
    width: 100%;
    max-width: 600px;
    border-radius: var(--border-radius);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    border: 4px solid rgba(255, 255, 255, 0.2);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download {
    background: #3b82f6;
    color: white;
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.btn-download:hover {
    background: #2563eb;
    transform: translateY(-3px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

/* 区域通用样式 */
section {
    padding: 100px 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.section-header p {
    color: var(--text-light);
    font-size: 1.125rem;
}

/* 功能特性 */
.features {
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

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

/* CTA 区域 */
.cta {
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

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

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

/* 页脚 */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

/* 使用手册页面样式 */
.manual-page {
    padding: 120px 0 80px;
    background: var(--bg-light);
    min-height: 100vh;
}

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

.manual-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.manual-header p {
    color: var(--text-light);
    font-size: 1.25rem;
}

.manual-content {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    max-width: 1000px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
}

.manual-section {
    margin-bottom: 4rem;
}

.manual-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--primary-color);
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--primary-color);
}

.manual-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--secondary-color);
}

.manual-section h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
    color: var(--text-color);
}

.manual-section p {
    color: var(--text-color);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.manual-section ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.manual-section ul li {
    margin-bottom: 0.75rem;
    color: var(--text-color);
    line-height: 1.7;
}

.manual-section strong {
    color: var(--primary-color);
    font-weight: 600;
}

.manual-section img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.screenshot-container {
    text-align: center;
    margin: 2rem 0;
}

.screenshot-container img {
    max-width: 100%;
    height: auto;
}

.screenshot-caption {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 0.75rem;
    text-align: center;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.feature-item {
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.feature-item strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.quick-links {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
}

.quick-links h4 {
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    font-size: 1.25rem;
}

.quick-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.quick-links ul li {
    margin-bottom: 0.75rem;
}

.quick-links ul li a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.quick-links ul li a:hover {
    text-decoration: underline;
}

.nav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.nav-tab {
    padding: 0.75rem 1.5rem;
    background: var(--bg-light);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.nav-tab:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-screenshot {
        max-width: 100%;
    }
    
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .manual-content {
        padding: 2rem;
    }
    
    .manual-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .nav-tab {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}