/* ===== 基础变量与重置 ===== */
:root {
    /* 主色调 */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;
    
    /* 紫色 */
    --purple-400: #a78bfa;
    --purple-500: #8b5cf6;
    --purple-600: #7c3aed;
    
    /* 灰色 */
    --gray-25: #fcfcfd;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --gray-950: #030712;
    
    /* 语义颜色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --bg-dark: var(--gray-950);
    
    /* 文字色 */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-500);
    --text-muted: var(--gray-400);
    --text-inverse: #ffffff;
    
    /* 边框 */
    --border-light: var(--gray-200);
    --border-medium: var(--gray-300);
    
    /* 阴影 */
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
    --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.15);
    --shadow-glow-lg: 0 0 100px rgba(99, 102, 241, 0.2);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    
    /* 动画 */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

code {
    font-family: var(--font-mono);
}

ul, ol {
    list-style: none;
}

/* ===== 布局容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ===== 公告栏 ===== */
.announcement-bar {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    color: white;
    padding: var(--space-3) 0;
    font-size: 14px;
}

.announcement-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.announcement-badge {
    background: rgba(255,255,255,0.2);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 12px;
}

.announcement-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-weight: 500;
    opacity: 0.9;
}

.announcement-link:hover {
    opacity: 1;
}

/* ===== 导航栏 ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 700;
    font-size: 20px;
    color: var(--text-primary);
}

.logo-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    transition: transform var(--transition-base);
}

.nav-brand:hover .logo-icon {
    transform: scale(1.05);
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--gray-100);
}

.nav-github {
    background: var(--gray-100);
}

.nav-github:hover {
    background: var(--gray-200);
}

.github-stars {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        padding: var(--space-4);
        background: white;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-lg);
        display: none;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        justify-content: center;
        padding: var(--space-3) var(--space-4);
    }
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    box-shadow: var(--shadow-sm), 0 0 0 0 rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--gray-200);
    border-color: var(--border-medium);
}

.btn-light {
    background: white;
    color: var(--gray-900);
    box-shadow: var(--shadow-sm);
}

.btn-light:hover {
    background: var(--gray-50);
    box-shadow: var(--shadow-md);
}

/* ===== 英雄区域 ===== */
.hero {
    position: relative;
    padding: var(--space-24) 0 var(--space-20);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.1), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(99, 102, 241, 0.08), transparent);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 50% at 50% 0%, black, transparent);
}

.hero-glow {
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12), transparent 60%);
    filter: blur(60px);
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.03em;
}

.title-gradient {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--primary-600) 50%, var(--purple-500) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-10);
    line-height: 1.7;
}

/* ===== 安装组件 ===== */
.install-widget {
    max-width: 560px;
    margin: 0 auto var(--space-10);
}

.install-tabs {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
}

.install-tab {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.install-tab:hover {
    color: var(--text-primary);
}

.install-tab.active {
    background: white;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.install-terminal {
    position: relative;
    background: var(--gray-950);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.terminal-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dots span:nth-child(1) { background: #ff5f57; }
.terminal-dots span:nth-child(2) { background: #febc2e; }
.terminal-dots span:nth-child(3) { background: #28c840; }

.terminal-title {
    font-size: 12px;
    color: var(--gray-500);
    font-family: var(--font-mono);
}

.terminal-body {
    padding: var(--space-5) var(--space-6);
}

.install-command {
    display: none;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-mono);
    font-size: 14px;
}

.install-command.active {
    display: flex;
}

.install-command .prompt {
    color: var(--primary-400);
    font-weight: 600;
}

.install-command code {
    color: var(--gray-100);
}

.copy-btn {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    padding: var(--space-2);
    color: var(--gray-400);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

/* ===== 英雄按钮 ===== */
.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* ===== 区块通用 ===== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-16);
}

.section-badge {
    display: inline-block;
    padding: var(--space-1) var(--space-4);
    background: var(--primary-50);
    color: var(--primary-600);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-badge-light {
    background: rgba(255,255,255,0.15);
    color: white;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 功能区域 ===== */
.features-section {
    padding: var(--space-24) 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-6);
}

.feature-card {
    padding: var(--space-8);
    background: white;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-200);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-4px);
}

.feature-card.featured {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    border: none;
    color: white;
}

.feature-card.featured h3,
.feature-card.featured p {
    color: white;
}

.feature-card.featured p {
    opacity: 0.9;
}

.feature-card.featured .feature-icon-wrapper {
    background: rgba(255,255,255,0.2);
    color: white;
}

.feature-icon-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--primary-50);
    color: var(--primary-600);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 统计区域 ===== */
.stats-section {
    padding: var(--space-24) 0;
}

.stats-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.stats-text h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
}

.stats-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.stat-card {
    text-align: center;
    padding: var(--space-6);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}

.stat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--primary-50);
    color: var(--primary-600);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

@media (max-width: 992px) {
    .stats-content {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }
    
    .stats-text {
        text-align: center;
    }
}

@media (max-width: 600px) {
    .stats-cards {
        grid-template-columns: 1fr;
    }
}

/* ===== 隐私区域 ===== */
.privacy-section {
    padding: var(--space-16) 0;
}

.privacy-card {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    padding: var(--space-16);
    text-align: center;
}

.privacy-content {
    max-width: 600px;
    margin: 0 auto;
}

.privacy-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: white;
    color: var(--primary-600);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-lg);
}

.privacy-card h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.privacy-card p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

.privacy-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-600);
    font-weight: 600;
}

.privacy-link:hover {
    color: var(--primary-700);
}

/* ===== Zen 区域 ===== */
.zen-section {
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-950) 100%);
    color: white;
}

.zen-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.zen-text h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.zen-text p {
    font-size: 1.125rem;
    color: var(--gray-400);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.zen-providers {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    margin-bottom: var(--space-8);
}

.provider-logo {
    padding: var(--space-3) var(--space-5);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-300);
}

.provider-logo.more {
    background: linear-gradient(135deg, var(--primary-600), var(--purple-600));
    border: none;
    color: white;
}

/* ===== FAQ 区域 ===== */
.faq-section {
    padding: var(--space-24) 0;
    background: var(--bg-secondary);
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.faq-item {
    background: white;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-200);
}

.faq-item[open] {
    box-shadow: var(--shadow-md);
}

.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-chevron {
    flex-shrink: 0;
    color: var(--text-tertiary);
    transition: transform var(--transition-base);
}

.faq-item[open] .faq-chevron {
    transform: rotate(180deg);
}

.faq-content {
    padding: 0 var(--space-6) var(--space-6);
}

.faq-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-content code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

/* ===== 订阅区域 ===== */
.newsletter-section {
    padding: var(--space-16) 0;
}

.newsletter-card {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--purple-600) 100%);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    text-align: center;
    color: white;
}

.newsletter-card h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.newsletter-card p {
    opacity: 0.9;
    margin-bottom: var(--space-8);
}

.newsletter-form {
    display: flex;
    gap: var(--space-3);
    max-width: 480px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: var(--space-3) var(--space-5);
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 15px;
}

.newsletter-form input::placeholder {
    color: rgba(255,255,255,0.7);
}

.newsletter-form input:focus {
    outline: none;
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.4);
}

.newsletter-form .btn-primary {
    background: white;
    color: var(--primary-600);
}

.newsletter-form .btn-primary:hover {
    background: var(--gray-100);
}

@media (max-width: 500px) {
    .newsletter-form {
        flex-direction: column;
    }
}

/* ===== 页脚 ===== */
.footer {
    background: var(--gray-950);
    color: var(--gray-400);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand p {
    margin-top: var(--space-3);
    font-size: 14px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 18px;
    font-weight: 700;
    color: white;
}

.footer-logo svg {
    color: var(--primary-500);
}

.footer-links-group h4 {
    color: white;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-links-group ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links-group a {
    font-size: 14px;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    font-size: 14px;
}

.footer-bottom a {
    color: var(--primary-400);
}

.footer-bottom a:hover {
    color: var(--primary-300);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}