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

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(255, 255, 255, 0.1);
    --gradient-primary: linear-gradient(135deg, #3b82f6, #06b6d4);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    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);
    font-weight: 500;
    transition: color 0.3s;
    padding: 8px 0;
}

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

/* ==================== Hero 区域 ==================== */
.hero {
    padding: 140px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.15) 0%, transparent 60%);
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--accent-blue);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==================== 按钮 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
}

.btn-outline:hover {
    background: var(--accent-blue);
    color: white;
}

/* ==================== 统计区域 ==================== */
.stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 4px;
}

/* ==================== 通用区块 ==================== */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ==================== 特性区域 ==================== */
.features {
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 14px;
    font-size: 1.75rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ==================== 步骤区域 ==================== */
.steps {
    background: var(--bg-secondary);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==================== 平台下载 ==================== */
.platforms {
    background: var(--bg-primary);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
    transition: all 0.3s;
}

.platform-card:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-4px);
}

.platform-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.platform-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.platform-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

/* ==================== FAQ ==================== */
.faq {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: rgba(59, 130, 246, 0.3);
}

.faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.faq-item h3::before {
    content: 'Q';
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 700;
}

.faq-item p {
    color: var(--text-secondary);
    padding-left: 40px;
    line-height: 1.7;
}

/* ==================== 下载页面 ==================== */
.download-header {
    padding: 140px 0 60px;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.15) 0%, transparent 60%);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    padding: 8px 16px;
    background: var(--bg-card);
    border-radius: 8px;
    margin-bottom: 24px;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.back-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.page-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.download-main-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-top: 32px;
    padding: 18px 48px;
    font-size: 1.25rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: 12px;
    font-weight: 700;
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.4);
    transition: all 0.3s;
}

.download-main-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.5);
}

/* 下载区块 */
.download-section {
    padding: 60px 0;
    background: var(--bg-secondary);
}

.download-section:nth-child(even) {
    background: var(--bg-primary);
}

.platform-title {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.75rem;
    margin-bottom: 24px;
}

.platform-title .icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.5rem;
}

.platform-title .icon.windows { background: linear-gradient(135deg, #0078d4, #00bcf2); }
.platform-title .icon.macos { background: linear-gradient(135deg, #555, #999); }
.platform-title .icon.linux { background: #fcc624; color: #333; }
.platform-title .icon.android { background: linear-gradient(135deg, #3DDC84, #00C853); }
.platform-title .icon.ios { background: linear-gradient(135deg, #555, #000); }

.client-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.client-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 24px;
    transition: all 0.3s;
}

.client-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
}

.client-info h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.client-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}

.client-meta span {
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
}

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

.size, .date {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.client-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.ios-note {
    text-align: center;
    padding: 20px;
    background: rgba(59, 130, 246, 0.05);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 12px;
    margin-top: 24px;
    color: var(--text-secondary);
}

/* ==================== 404页面 ==================== */
.error-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.error-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 100px 24px;
    text-align: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-title {
    font-size: 2rem;
    margin: 16px 0 24px;
}

.error-desc {
    color: var(--text-secondary);
    max-width: 500px;
    line-height: 1.8;
    margin-bottom: 32px;
}

.error-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.error-suggestions {
    margin-top: 48px;
}

.error-suggestions h3 {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.suggestion-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.suggestion-links a {
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.suggestion-links a:hover {
    color: var(--text-primary);
    border-color: var(--accent-blue);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 48px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .features-grid,
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .page-title {
        font-size: 2.25rem;
    }
    
    .features-grid,
    .steps-grid,
    .platform-grid {
        grid-template-columns: 1fr;
    }
    
    .stats {
        gap: 32px;
    }
    
    .navbar .container {
        flex-direction: column;
        height: auto;
        padding: 16px 24px;
        gap: 16px;
    }
    
    .nav-menu {
        gap: 24px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}