/* =========================================
   摘星星链 - 主样式表 (main.css)
   科技风设计系统
   ========================================= */

/* --- CSS 变量 (科技风) --- */
:root {
    /* 主色调 */
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-secondary: #06b6d4;
    --color-accent: #8b5cf6;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    /* 背景色 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.6);
    --bg-glass: rgba(15, 23, 42, 0.8);
    --bg-overlay: rgba(15, 23, 42, 0.95);

    /* 文字颜色 */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0f172a;

    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #0f172a 100%);
    --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
    --gradient-card: linear-gradient(180deg, rgba(99, 102, 241, 0.1), transparent);
    --gradient-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.3), transparent 70%);

    /* 边框 */
    --border-color: rgba(99, 102, 241, 0.2);
    --border-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* 字体 */
    --font-heading: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
    --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* 字号 */
    --text-hero: clamp(2.5rem, 5vw, 4.5rem);
    --text-h1: clamp(2rem, 4vw, 3rem);
    --text-h2: clamp(1.5rem, 3vw, 2rem);
    --text-h3: 1.25rem;
    --text-body: 1rem;
    --text-small: 0.875rem;

    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.2);

    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* --- 全局重置 --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

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

input, textarea, select {
    font-family: inherit;
}

/* --- 工具类 --- */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

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

.section-tag {
    display: inline-block;
    font-size: var(--text-small);
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    background: rgba(6, 182, 212, 0.1);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.section-title {
    font-size: var(--text-h1);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.section-desc {
    font-size: var(--text-body);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- 按钮 --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--text-body);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.4);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

.btn-ghost {
    color: var(--text-primary);
    background: transparent;
}

.btn-ghost:hover {
    color: var(--color-primary-light);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* --- 导航栏 --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: all var(--transition-base);
    background: transparent;
}

.navbar.scrolled {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-sm) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

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

.nav-link {
    font-size: var(--text-small);
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

/* 下载导航链接：高亮强调，提升可见度 */
.nav-link-download {
    color: var(--color-primary-light);
    font-weight: 600;
}

.btn-nav-download svg {
    flex-shrink: 0;
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

/* --- Hero 区域 --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-2xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: -2;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: -1;
    mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
}

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

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid var(--border-color);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-xl);
    font-size: var(--text-small);
    color: var(--color-primary-light);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: var(--text-hero);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
}

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

.stat-number {
    font-size: var(--text-h1);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.stat-label {
    font-size: var(--text-small);
    color: var(--text-muted);
    margin-top: var(--space-xs);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator span {
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    animation: scrollDown 1.5s infinite;
}

@keyframes scrollDown {
    0% { top: 6px; opacity: 1; }
    100% { top: 24px; opacity: 0; }
}

/* --- 产品矩阵 --- */
.products {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

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

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

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

.product-card.featured {
    grid-column: span 2;
    grid-row: span 2;
    padding: var(--space-2xl);
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.15), transparent);
}

.product-card-glow {
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15), transparent 60%);
    pointer-events: none;
}

.product-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    color: var(--color-primary-light);
}

.claw-icon {
    width: 80px;
    height: 80px;
}

.product-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
    background: rgba(6, 182, 212, 0.1);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-sm);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.product-name {
    font-size: var(--text-h3);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.product-desc {
    font-size: var(--text-body);
    color: var(--color-primary-light);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.product-detail {
    font-size: var(--text-small);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.product-features {
    margin-bottom: var(--space-md);
}

.product-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-small);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.check-icon {
    color: var(--color-success);
    font-weight: bold;
}

.product-link {
    font-size: var(--text-small);
    font-weight: 600;
    color: var(--color-primary-light);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    transition: gap var(--transition-base);
}

.product-link:hover {
    gap: var(--space-sm);
}

/* --- 核心优势 --- */
.features {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

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

.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-base);
}

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

.feature-number {
    font-size: var(--text-h2);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: 0.5;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: var(--text-h3);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

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

/* --- 解决方案 --- */
.solutions {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.solutions-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-small);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

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

.tab-btn.active {
    color: var(--text-primary);
    background: var(--gradient-primary);
    border-color: transparent;
}

.solution-content {
    display: none;
}

.solution-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.solution-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.solution-info h3 {
    font-size: var(--text-h2);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.solution-info p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.solution-list {
    margin-bottom: var(--space-lg);
}

.solution-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-size: var(--text-small);
}

.solution-list li::before {
    content: '✦';
    color: var(--color-primary-light);
}

.solution-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-placeholder {
    width: 100%;
    aspect-ratio: 16/10;
    background: var(--bg-secondary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--text-muted);
}

.visual-icon {
    font-size: 3rem;
}

/* --- 数据统计 --- */
.stats-section {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

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

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.stat-value {
    font-size: var(--text-h1);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: var(--space-xs);
}

.stat-desc {
    font-size: var(--text-small);
    color: var(--text-muted);
}

/* --- 客户评价 --- */
.testimonials {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.testimonials-slider {
    overflow: hidden;
    position: relative;
}

.testimonial-track {
    display: flex;
    gap: var(--space-lg);
    animation: scrollTestimonials 20s linear infinite;
}

@keyframes scrollTestimonials {
    0% { transform: translateX(0); }
    100% { transform: translateX(-33.333%); }
}

.testimonial-card {
    min-width: 400px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    flex-shrink: 0;
}

.testimonial-rating {
    color: var(--color-warning);
    margin-bottom: var(--space-md);
    font-size: 1.25rem;
}

.testimonial-text {
    color: var(--text-secondary);
    font-size: var(--text-body);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: #fff;
}

.author-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.author-role {
    font-size: var(--text-small);
    color: var(--text-muted);
}

/* --- 下载客户端 --- */
.download {
    position: relative;
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    overflow: hidden;
}

.download-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.08) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(circle at 50% 0%, black, transparent 70%);
    -webkit-mask-image: radial-gradient(circle at 50% 0%, black, transparent 70%);
    pointer-events: none;
}

.download .container {
    position: relative;
    z-index: 1;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 960px;
    margin: 0 auto;
}

.download-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.download-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

/* 平台特异的微弱色调，区分 Windows 与 macOS */
.download-card--win {
    background: linear-gradient(160deg, rgba(6, 182, 212, 0.12), transparent 60%), var(--bg-card);
}

.download-card--mac {
    background: linear-gradient(160deg, rgba(139, 92, 246, 0.12), transparent 60%), var(--bg-card);
}

.download-card-glow {
    position: absolute;
    top: -40%;
    right: -30%;
    width: 160%;
    height: 160%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.18), transparent 60%);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

/* 当前系统推荐版本：边框高亮 + 角标 */
.download-card.recommended {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.download-card.recommended::after {
    content: '为你推荐';
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    z-index: 1;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: #fff;
    background: var(--gradient-primary);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.download-os {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.download-os-logo {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
}

.download-os-logo svg {
    width: 30px;
    height: 30px;
}

.download-card--win .download-os-logo {
    color: var(--color-secondary);
}

.download-card--mac .download-os-logo {
    color: var(--color-accent);
}

.download-os-eyebrow {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.download-os-name {
    font-size: var(--text-h3);
    font-weight: 700;
    color: var(--text-primary);
}

.download-tagline {
    font-size: var(--text-small);
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.download-specs {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.download-spec {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.download-spec dt {
    font-size: var(--text-small);
    color: var(--text-muted);
}

.download-spec dd {
    font-size: var(--text-small);
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.download-btn {
    width: 100%;
    margin-top: auto;
}

.download-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--space-sm);
}

.download-tip {
    text-align: center;
    font-size: var(--text-small);
    color: var(--text-muted);
    margin-top: var(--space-xl);
}

.download-tip a {
    color: var(--color-primary-light);
}

.download-tip a:hover {
    color: var(--color-secondary);
}

/* --- CTA 区域 --- */
.cta-section {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.cta-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.15));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150%;
    height: 150%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1), transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-size: var(--text-h1);
    font-weight: 800;
    margin-bottom: var(--space-md);
    position: relative;
    z-index: 1;
}

.cta-desc {
    color: var(--text-secondary);
    font-size: var(--text-body);
    margin-bottom: var(--space-xl);
    position: relative;
    z-index: 1;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}

.cta-note {
    font-size: var(--text-small);
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* --- 页脚 --- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-brand .logo {
    margin-bottom: var(--space-md);
}

.footer-desc {
    color: var(--text-muted);
    font-size: var(--text-small);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.footer-social a:hover {
    color: var(--color-primary-light);
}

.footer-links h4, .footer-contact h4 {
    font-size: var(--text-small);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links ul, .footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links a, .footer-contact li {
    font-size: var(--text-small);
    color: var(--text-muted);
    transition: color var(--transition-base);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border-color);
    font-size: var(--text-small);
    color: var(--text-muted);
}

.footer-legal {
    display: flex;
    gap: var(--space-md);
}

.footer-legal a {
    color: var(--text-muted);
}

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

/* --- 动画类 --- */
[data-animate] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}