/* ============================================
   FunTrek Lab 产品官网样式
   简约现代风格
   ============================================ */

/* CSS 变量 */
:root {
    --color-primary: #6366F1;
    --color-primary-dark: #4F46E5;
    --color-text: #1E293B;
    --color-text-secondary: #64748B;
    --color-bg: #FFFFFF;
    --color-bg-gray: #F0F4FF;
    --color-border: #E2E8F0;
    --color-shadow: rgba(99, 102, 241, 0.08);

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;

    --header-height: 64px;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

ul, ol {
    list-style: none;
}

/* 容器 */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
    z-index: 1000;
    transition: background var(--transition-normal);
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.05);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition-fast);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: var(--header-height);
    /* 使用新背景图 */
    background-image: url('../assets/hero-bg-new2.png');
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

/* Hero 文字容器 - 无卡片，直接显示 */
.hero-content {
    position: relative;
    z-index: 1;
    padding: 40px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    color: #1E293B;
    text-shadow: 0 2px 12px rgba(255, 255, 255, 0.9);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: #6366F1;
    text-shadow: 0 1px 8px rgba(255, 255, 255, 0.8);
}

.hero-desc {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: #475569;
    text-shadow: 0 1px 6px rgba(255, 255, 255, 0.8);
}

/* ============================================
   按钮
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

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

/* ============================================
   通用区块
   ============================================ */
.section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
}

.section:nth-child(odd) {
    background: linear-gradient(180deg, #F8FAFC 0%, #EEF2FF 100%);
}

.section-gray {
    background: linear-gradient(180deg, #EEF2FF 0%, #E8F4FD 50%, #F0F4FF 100%);
}

.section-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-desc {
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

/* ============================================
   关于我们
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.06);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

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

/* ============================================
   产品展示
   ============================================ */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.1);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    cursor: pointer;
    border: 1px solid rgba(99, 102, 241, 0.08);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.15);
}

.product-icon-wrap {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-icon {
    width: 80%;
    height: 80%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.product-icon-placeholder {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-primary) 0%, #5856D6 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.product-info {
    padding: var(--spacing-md);
}

.product-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    /* 限制两行 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    /* 限制两行 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
}

.product-link:hover {
    color: var(--color-primary-dark);
}

/* ============================================
   隐私协议
   ============================================ */
.privacy-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.privacy-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.privacy-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.privacy-content p:last-of-type {
    margin-bottom: var(--spacing-lg);
}

.privacy-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.privacy-btn {
    min-width: 160px;
}

/* ============================================
   技术支持
   ============================================ */
.support-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.support-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.06);
}

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

.support-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.support-item p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.support-item a {
    font-size: 0.875rem;
    font-weight: 500;
}

.link {
    color: var(--color-primary);
    font-weight: 500;
}

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

/* ============================================
   页脚
   ============================================ */
.footer {
    background: linear-gradient(180deg, #1E293B 0%, #0F172A 100%);
    color: white;
    padding: var(--spacing-lg) 0;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

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

.footer-copy {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 60px;
        --spacing-lg: 32px;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: white;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        color: var(--color-text);
    }

    .nav-toggle {
        display: flex;
    }

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

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

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

    .hero-content {
        padding: var(--spacing-lg);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .support-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

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

    .stat-item {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        text-align: left;
    }

    .stat-number {
        margin-bottom: 0;
        font-size: 1.5rem;
    }
}

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

.product-card {
    animation: fadeIn 0.4s ease forwards;
}

.product-card:nth-child(1) { animation-delay: 0.05s; }
.product-card:nth-child(2) { animation-delay: 0.1s; }
.product-card:nth-child(3) { animation-delay: 0.15s; }
.product-card:nth-child(4) { animation-delay: 0.2s; }
.product-card:nth-child(5) { animation-delay: 0.25s; }
.product-card:nth-child(6) { animation-delay: 0.3s; }
.product-card:nth-child(7) { animation-delay: 0.35s; }
.product-card:nth-child(8) { animation-delay: 0.4s; }
.product-card:nth-child(9) { animation-delay: 0.45s; }
.product-card:nth-child(10) { animation-delay: 0.5s; }
.product-card:nth-child(11) { animation-delay: 0.55s; }