/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主题色 */
    --primary-color: #8B5CF6;
    --secondary-color: #EC4899;
    --accent-color: #06B6D4;
    
    /* 背景色 */
    --bg-dark: #0F172A;
    --bg-card: #1E293B;
    --bg-hover: #334155;
    
    /* 文字色 */
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
    --gradient-secondary: linear-gradient(135deg, #06B6D4 0%, #3B82F6 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    cursor: pointer;
}

.logo-icon {
    font-size: 32px;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

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

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 28px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==================== 主横幅 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.15) 0%, transparent 50%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 48px 0;
}

.hero-title {
    font-size: 64px;
    font-weight: 900;
    margin-bottom: 24px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 28px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--primary-color);
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

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

.animate-fade-in {
    animation: fadeIn 0.8s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 0.8s ease-out 0.4s both;
}

.animate-fade-in-delay-3 {
    animation: fadeIn 0.8s ease-out 0.6s both;
}

.animate-fade-in-delay-4 {
    animation: fadeIn 0.8s ease-out 0.8s both;
}

/* ==================== 通用区块 ==================== */
.section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-muted);
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.feature-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-description {
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.7;
}

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

.feature-list li {
    color: var(--text-secondary);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ==================== 应用截图 ==================== */
.screenshots {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #1a1f2e 100%);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.screenshot-placeholder {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    aspect-ratio: 9 / 16;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px dashed rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.screenshot-placeholder:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.screenshot-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.screenshot-placeholder p {
    font-size: 18px;
    color: var(--text-muted);
}

/* ==================== 技术亮点 ==================== */
.tech-highlights {
    background: var(--bg-dark);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.tech-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.tech-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.tech-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.tech-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* ==================== 下载区域 ==================== */
.download {
    background: linear-gradient(180deg, #1a1f2e 0%, var(--bg-dark) 100%);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.download-card {
    background: var(--bg-card);
    padding: 48px;
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

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

.platform-icon {
    font-size: 72px;
    margin-bottom: 24px;
}

.download-card h3 {
    font-size: 28px;
    margin-bottom: 8px;
}

.version {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.requirements {
    list-style: none;
    margin-bottom: 32px;
}

.requirements li {
    color: var(--text-secondary);
    padding: 8px 0;
}

.btn-download,
.btn-store {
    display: block;
    width: 100%;
    margin-bottom: 12px;
}

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

.btn-store {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.disabled:hover {
    transform: none;
}

.download-notice {
    text-align: center;
    padding: 24px;
    background: rgba(236, 72, 153, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(236, 72, 153, 0.3);
}

.download-notice p {
    color: var(--secondary-color);
    font-size: 16px;
}

/* ==================== 文档链接 ==================== */
.docs {
    background: var(--bg-dark);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.doc-card {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    text-decoration: none;
    color: inherit;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

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

.doc-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.doc-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.doc-card p {
    color: var(--text-muted);
    font-size: 14px;
}

/* ==================== 联系我们 ==================== */
.contact {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #1a1f2e 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.contact-card {
    background: var(--bg-card);
    padding: 48px;
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 56px;
    margin-bottom: 24px;
}

.contact-card h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* ==================== 页脚 ==================== */
.footer {
    background: #0a0e1a;
    padding: 64px 0 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 48px;
    margin-bottom: 48px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    color: var(--text-muted);
    margin-bottom: 8px;
}

/* ==================== 返回顶部按钮 ==================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    opacity: 0;
    transform: translateY(100px);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid,
    .tech-grid,
    .download-cards,
    .docs-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .section {
        padding: 64px 0;
    }
}