/* ============================================
   Clash Verge 中文官方网站 - 设计系统 v4.0
   文件夹: c7/
   主题: Light Mode / 极简科技风 + 升级UI
   SEO: 语义化HTML + 结构化数据 + 关键词优化
   ============================================ */

/* ========== CSS 设计令牌系统 ========== */
:root {
    /* 色彩令牌 - 浅色底色系 */
    --bg-primary: #f8f9fc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef1f6;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --bg-glass-hover: rgba(59, 130, 246, 0.03);

    /* 主色系 - 靛蓝 */
    --accent-primary: #3b82f6;
    --accent-primary-light: #60a5fa;
    --accent-primary-dark: #2563eb;
    --accent-primary-dim: rgba(59, 130, 246, 0.08);
    --accent-primary-glow: rgba(59, 130, 246, 0.15);

    /* 辅助色系 - 紫罗兰 */
    --accent-secondary: #8b5cf6;
    --accent-secondary-light: #a78bfa;
    --accent-secondary-dim: rgba(139, 92, 246, 0.07);
    --accent-secondary-glow: rgba(139, 92, 246, 0.12);

    /* 强调色 - 翠绿 */
    --accent-teal: #14b8a6;
    --accent-teal-dim: rgba(20, 184, 166, 0.08);

    /* 功能色 */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* 渐变 */
    --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-hero: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #c084fc 100%);
    --gradient-subtle: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.02) 50%, transparent 100%);
    --gradient-card-border: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(139, 92, 246, 0.3));
    --gradient-hero-text: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);

    /* 文本色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-accent: #3b82f6;

    /* 边框 & 阴影 */
    --border-color: #e2e8f0;
    --border-subtle: #f1f5f9;
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.03);
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07);
    --shadow-lg: 0 16px 48px rgba(15, 23, 42, 0.09);
    --shadow-xl: 0 24px 64px rgba(15, 23, 42, 0.12);
    --shadow-glow-primary: 0 4px 32px rgba(59, 130, 246, 0.1);
    --shadow-glow-secondary: 0 4px 32px rgba(139, 92, 246, 0.08);

    /* 圆角 */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* 字体 */
    --font-display: 'Space Grotesk', 'Inter', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* 间距令牌 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* 过渡 */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: 200ms var(--ease-out-expo);
    --transition-normal: 350ms var(--ease-out-expo);
    --transition-slow: 500ms var(--ease-out-expo);

    /* 容器 */
    --container-max: 1200px;
    --container-narrow: 860px;
}

/* ========== 基础重置 ========== */
*, *::before, *::after {
    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-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

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

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

::selection {
    background: rgba(59, 130, 246, 0.15);
    color: var(--text-primary);
}

/* ========== 背景系统 ========== */
.bg-canvas {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.bg-grid {
    position: absolute;
    width: 250%;
    height: 250%;
    top: -75%;
    left: -75%;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 25%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 25%, transparent 70%);
    animation: gridDrift 35s linear infinite;
}

@keyframes gridDrift {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.45;
    animation: orbPulse 22s ease-in-out infinite;
}

.bg-orb-1 {
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.16), transparent 70%);
    top: -15%; right: -10%;
}

.bg-orb-2 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.12), transparent 70%);
    bottom: 5%; left: -10%;
    animation-delay: -8s;
}

.bg-orb-3 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.08), transparent 70%);
    top: 45%; left: 38%;
    animation-delay: -15s;
}

@keyframes orbPulse {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.45; }
    33% { transform: translate(35px, -25px) scale(1.05); opacity: 0.55; }
    66% { transform: translate(-20px, 20px) scale(0.96); opacity: 0.38; }
}

.bg-noise {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(248, 249, 252, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: 0 1px 20px rgba(15, 23, 42, 0.05);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    object-fit: contain;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.25);
}

.nav-logo-text {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: var(--gradient-hero-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2px;
    list-style: none;
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
    letter-spacing: 0.2px;
}

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

.nav-link.active {
    color: var(--accent-primary);
    background: var(--accent-primary-dim);
    font-weight: 600;
}

.nav-cta {
    padding: 8px 20px !important;
    background: var(--gradient-hero) !important;
    color: #fff !important;
    border-radius: var(--radius-full) !important;
    font-weight: 600 !important;
    letter-spacing: 0.3px !important;
    margin-left: 8px;
    font-size: 13px !important;
}

.nav-cta:hover {
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3) !important;
    transform: translateY(-1px) !important;
}

/* 汉堡菜单 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.menu-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s var(--ease-spring);
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== 页面容器 ========== */
.page-wrapper {
    padding-top: 72px;
    min-height: 100vh;
    animation: pageIn 0.5s var(--ease-out-expo);
}

@keyframes pageIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ========== Hero 区域 ========== */
.hero {
    min-height: calc(100vh - 72px);
    display: flex;
    align-items: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
}

.hero-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 60px;
    align-items: center;
}

.hero-left {
    animation: heroSlideLeft 0.8s var(--ease-out-expo) forwards;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent-primary-dim);
    border: 1px solid rgba(59, 130, 246, 0.12);
    border-radius: var(--radius-full);
    font-size: 13px;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
    font-weight: 600;
    letter-spacing: 0.3px;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-success);
    border-radius: 50%;
    animation: dotBlink 2s ease-in-out infinite;
    box-shadow: 0 0 6px rgba(16, 185, 129, 0.4);
}

@keyframes dotBlink {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.8); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(36px, 5.5vw, 60px);
    font-weight: 800;
    line-height: 1.08;
    margin-bottom: var(--space-md);
    letter-spacing: -1.5px;
    color: var(--text-primary);
}

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

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 480px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    font-family: inherit;
    letter-spacing: 0.2px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::before { opacity: 1; }

.btn-primary {
    background: var(--gradient-hero);
    color: #fff;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: var(--accent-primary-dim);
    transform: translateY(-1px);
}

.btn-teal {
    background: linear-gradient(135deg, #14b8a6, #0d9488);
    color: #fff;
    box-shadow: 0 4px 20px rgba(20, 184, 166, 0.2);
}

.btn-teal:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(20, 184, 166, 0.3);
}

/* ========== Hero 右侧视觉 ========== */
.hero-right {
    position: relative;
    animation: heroSlideRight 0.8s var(--ease-out-expo) 0.15s forwards;
    opacity: 0;
}

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

.hero-mockup {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
    position: relative;
    overflow: hidden;
}

.hero-mockup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
}

.mockup-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.mockup-dot { width: 11px; height: 11px; border-radius: 50%; }
.mockup-dot.red { background: #ef4444; }
.mockup-dot.yellow { background: #eab308; }
.mockup-dot.green { background: #22c55e; }

.mockup-title {
    margin-left: 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.mockup-body {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mockup-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    transition: all var(--transition-fast);
}

.mockup-row:hover {
    background: var(--accent-primary-dim);
    border-color: rgba(59, 130, 246, 0.12);
}

.mockup-status {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--color-success);
    box-shadow: 0 0 6px rgba(16, 185, 129, 0.3);
    flex-shrink: 0;
}

.mockup-status.offline {
    background: var(--text-muted);
    box-shadow: none;
}

.mockup-text {
    flex: 1;
    font-size: 12px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.mockup-speed {
    font-size: 10px;
    color: var(--accent-primary);
    font-family: var(--font-display);
    font-weight: 600;
    padding: 3px 8px;
    background: var(--accent-primary-dim);
    border-radius: var(--radius-xs);
    white-space: nowrap;
}

/* 浮动卡片 */
.hero-float-card {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    box-shadow: var(--shadow-md);
    animation: floatY 5s var(--ease-out-expo) infinite;
}

.hero-float-card.card-1 { top: -12px; right: -20px; }
.hero-float-card.card-2 { bottom: 25px; left: -35px; animation-delay: -2.5s; }

@keyframes floatY {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.float-label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.float-value {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 800;
    background: var(--gradient-hero-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 2px;
}

/* ========== 特性区域 ========== */
.features-section {
    padding: var(--space-4xl) var(--space-lg);
    max-width: var(--container-max);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 800;
    margin-bottom: var(--space-md);
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 15px;
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xs);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-card-border);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.18);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
}

.feature-card:hover::before { opacity: 1; }

.feature-icon {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: var(--space-lg);
}

.feature-title {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ========== 统计区域 ========== */
.stats-section {
    padding: var(--space-3xl) var(--space-lg);
    background: var(--gradient-subtle);
    position: relative;
}

.stats-container {
    max-width: 960px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

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

.stat-number {
    font-family: var(--font-display);
    font-size: clamp(32px, 4vw, 44px);
    font-weight: 800;
    background: var(--gradient-hero-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
    line-height: 1.1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* ========== 下载页面 ========== */
.download-page {
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
}

.page-hero {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
    position: relative;
}

.page-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    margin-bottom: var(--space-md);
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.page-hero p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 560px;
    margin: 0 auto;
}

.divider-deco {
    width: 50px; height: 3px;
    background: var(--gradient-hero);
    border-radius: 2px;
    margin: var(--space-md) auto;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.downloads-grid {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xs);
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-card-border);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.download-card:hover {
    transform: translateY(-4px);
    border-color: rgba(59, 130, 246, 0.18);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
}

.download-card:hover::before { opacity: 1; }

.download-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.download-platform-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, var(--accent-primary-dim), var(--accent-secondary-dim));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
}

.download-platform-info h3 {
    font-family: var(--font-display);
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.download-platform-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.download-version {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: var(--accent-secondary-dim);
    border: 1px solid rgba(139, 92, 246, 0.12);
    border-radius: var(--radius-full);
    font-size: 11px;
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: var(--space-lg);
    font-family: var(--font-mono);
}

.download-features {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.download-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.download-features li::before {
    content: '✓';
    color: var(--color-success);
    font-weight: bold;
    font-size: 13px;
    flex-shrink: 0;
}

.btn-download {
    width: 100%;
    justify-content: center;
    padding: 13px 24px;
}

/* ========== 内容页面通用 ========== */
.content-page {
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
}

.content-body {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) var(--space-xl);
    margin-bottom: var(--space-xl);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-hero);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.content-card:hover::before { opacity: 1; }

.content-card h2 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--accent-primary);
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-card p, .content-card li {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
}

.content-card ul { list-style: none; padding-left: 0; }

.content-card ul li {
    padding-left: 24px;
    position: relative;
}

.content-card ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

.content-card strong { color: var(--text-primary); }

/* Info/Warning boxes */
.info-box {
    background: var(--accent-primary-dim);
    border: 1px solid rgba(59, 130, 246, 0.12);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.info-box strong { color: var(--accent-primary); }

.warning-box {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.15);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.warning-box strong { color: var(--color-warning); }

/* FAQ */
details {
    margin-bottom: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    border: 1px solid var(--border-subtle);
    transition: border-color var(--transition-fast);
}

details:hover { border-color: var(--border-color); }

details[open] { border-color: rgba(59, 130, 246, 0.15); }

summary {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

summary::before {
    content: '▸';
    color: var(--accent-primary);
    font-size: 12px;
    transition: transform 0.2s;
}

details[open] summary::before { transform: rotate(90deg); }

details p, details div {
    margin-top: var(--space-sm);
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 34px;
    margin-top: var(--space-lg);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 9px; top: 0; bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: -29px; top: 5px;
    width: 12px; height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-primary-dim), 0 0 10px rgba(59, 130, 246, 0.15);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--accent-primary);
    margin-bottom: 3px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.timeline-title {
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 3px;
    font-size: 14px;
}

.timeline-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ========== Markdown 渲染样式 ========== */
.markdown-body {
    font-size: 14px;
    line-height: 1.85;
    color: var(--text-secondary);
}

.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
    font-family: var(--font-display);
    color: var(--text-primary);
    margin: 24px 0 12px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.markdown-body h2 {
    font-size: 21px;
    color: var(--accent-primary);
    border-bottom: 2px solid var(--border-subtle);
    padding-bottom: 8px;
}

.markdown-body h3 { font-size: 17px; color: var(--text-primary); }
.markdown-body p { margin-bottom: 14px; }
.markdown-body ul, .markdown-body ol { padding-left: 22px; margin-bottom: 14px; }
.markdown-body li { margin-bottom: 5px; }

.markdown-body code {
    font-family: var(--font-mono);
    background: var(--accent-primary-dim);
    padding: 2px 7px;
    border-radius: var(--radius-xs);
    font-size: 12px;
    color: var(--accent-primary);
    border: 1px solid rgba(59, 130, 246, 0.08);
}

.markdown-body pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 18px;
}

.markdown-body pre code {
    background: none; padding: 0;
    color: var(--text-secondary);
    font-size: 12px; border: none; line-height: 1.6;
}

.markdown-body blockquote {
    border-left: 3px solid var(--accent-primary);
    padding: 12px 20px;
    margin: 16px 0;
    color: var(--text-muted);
    font-style: italic;
    background: var(--accent-primary-dim);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body a {
    color: var(--accent-primary);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.markdown-body a:hover { border-bottom-color: var(--accent-primary); }

.markdown-body table {
    width: 100%; border-collapse: collapse;
    margin-bottom: 18px; font-size: 13px;
}

.markdown-body th, .markdown-body td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.markdown-body th {
    background: var(--accent-primary-dim);
    font-family: var(--font-display);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.markdown-body tr:hover td { background: var(--bg-tertiary); }

.markdown-body hr {
    border: none;
    height: 1px;
    background: var(--border-color);
    margin: 32px 0;
}

.markdown-body strong { color: var(--text-primary); font-weight: 650; }

/* ========== CTA 区域 ========== */
.cta-section {
    padding: var(--space-3xl) var(--space-lg);
    text-align: center;
    position: relative;
}

.cta-section h2 {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.cta-section p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: var(--space-lg);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* ========== 友情链接 ========== */
.friend-links {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-lg);
    text-align: center;
}

.friend-links h4 {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.friend-links-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 20px;
}

.friend-links-list a {
    color: var(--text-muted);
    font-size: 13px;
    transition: color var(--transition-fast);
}

.friend-links-list a:hover { color: var(--accent-primary); }

/* ========== 页脚 ========== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: var(--space-2xl) var(--space-lg) var(--space-xl);
    background: var(--bg-secondary);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr 1fr;
    gap: 44px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 12px;
    line-height: 1.75;
    max-width: 300px;
}

.footer-col h4 {
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.footer-col a {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    padding: 5px 0;
    transition: all var(--transition-fast);
}

.footer-col a:hover {
    color: var(--accent-primary);
    transform: translateX(3px);
}

.footer-bottom {
    max-width: var(--container-max);
    margin: 40px auto 0;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-muted);
}

.footer-links-inline {
    display: flex;
    gap: 20px;
}

.footer-links-inline a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: 12px;
}

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

/* ========== 滚动动画 ========== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal:nth-child(2) { transition-delay: 0.06s; }
.reveal:nth-child(3) { transition-delay: 0.12s; }
.reveal:nth-child(4) { transition-delay: 0.18s; }
.reveal:nth-child(5) { transition-delay: 0.24s; }
.reveal:nth-child(6) { transition-delay: 0.3s; }

/* ========== 对比表格 ========== */
.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin-top: var(--space-lg);
}

.compare-table th, .compare-table td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--border-color);
}

.compare-table th {
    background: var(--accent-primary-dim);
    font-family: var(--font-display);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.compare-table tr:hover td { background: var(--bg-tertiary); }
.compare-table .check { color: var(--color-success); font-weight: bold; }
.compare-table .cross { color: var(--text-muted); }

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 42px;
    height: 42px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
    opacity: 0;
    pointer-events: none;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1100px) {
    .hero-grid { gap: 36px; }
    .footer-container { gap: 32px; }
}

@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-container { grid-template-columns: repeat(2, 1fr); gap: 44px; }
    .footer-container { grid-template-columns: repeat(2, 1fr); }
    .hero-float-card.card-2 { display: none; }
}

@media (max-width: 768px) {
    :root {
        --space-3xl: 48px;
        --space-4xl: 64px;
    }

    .menu-toggle { display: flex; }

    .nav-links {
        display: none;
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px; gap: 4px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
    }

    .nav-links.open { display: flex; }
    .nav-cta { margin-left: 0; margin-top: 8px; width: 100%; justify-content: center; }

    .hero { padding: var(--space-2xl) var(--space-md); }
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 36px; }
    .hero-left { order: 1; }
    .hero-right { order: 2; display: none; }
    .hero-subtitle { margin: 0 auto var(--space-xl); }
    .hero-actions { justify-content: center; }

    .features-grid { grid-template-columns: 1fr; }
    .downloads-grid { grid-template-columns: 1fr; }
    .stats-container { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .footer-container { grid-template-columns: 1fr; gap: var(--space-xl); }
    .footer-bottom { flex-direction: column; gap: 14px; text-align: center; }
    .content-card { padding: var(--space-xl) var(--space-lg); }
    .hero-float-card { display: none; }
    .download-card { padding: var(--space-lg); }
    .back-to-top { bottom: 20px; right: 20px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 32px; }
    .stats-container { grid-template-columns: 1fr 1fr; gap: 24px; }
    .stat-number { font-size: 28px; }
    .btn { padding: 12px 22px; font-size: 13px; }
    .nav-logo-text { font-size: 15px; }
}


/* ===== 下载弹窗 ===== */
.popup-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  z-index: 9999;
  justify-content: center;
  align-items: center;
}
.popup-overlay.active { display: flex; }
.popup {
  background: var(--bg-card, #fff);
  border-radius: var(--radius-lg, 16px);
  padding: 40px 32px 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 24px 64px rgba(0,0,0,.2);
  animation: popupIn .25s ease;
}
@keyframes popupIn {
  from { opacity: 0; transform: translateY(16px) scale(.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.popup-ic { font-size: 44px; margin-bottom: 16px; }
.popup h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text-primary, #0f172a);
}
.popup p {
  font-size: .9rem;
  color: var(--text-secondary, #64748b);
  margin: 0 0 28px;
  line-height: 1.6;
}
.popup-btns { display: flex; gap: 12px; justify-content: center; }
.popup-btns .btn { min-width: 110px; }

/* ===== c3c7 整改: 内联样式外置(铁律17) ===== */
.inline-flex { display:inline-flex; }
.inline-flex-mb8 { margin-bottom:8px;display:inline-flex; }
.text-center-mt15 { margin-top:1.5rem;text-align:center; }
.table-scroll { overflow-x:auto; }
.mt-72 { margin-top:72px; }
.note-center { margin-top:1rem;text-align:center;font-size:0.9rem;color:var(--text-muted); }

.js .reveal { opacity: 0; }
.js .reveal.in { opacity: 1; }