/* 
 * LINARIS.io - Modern B2B SaaS/AI Landing Page Stylesheet
 * Version: 1.0.0
 */

/* 1. CSS变量定义 */
:root {
    /* 颜色变量 */
    --color-primary: #000000;
    --color-secondary: #121212;
    --color-bg-light: #FFFFFF;
    --color-bg-dark: #121212;
    --color-text-main: #000000;
    --color-text-muted: #444444;
    --color-text-light: #FFFFFF;
    --color-text-dim: #A0A0A0;
    
    /* 辅助色 & 点缀色 */
    --color-accent: #00FFC2; /* 荧光青/绿 */
    --color-status-green: #22C55E;
    --color-pastel-orange: #FFF4E5;
    --color-pastel-blue: #E5F0FF;
    --color-pastel-red: #FFE5E5;
    
    /* 字体变量 */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Helvetica Neue', Arial, sans-serif;
    
    /* 间距 & 布局 */
    --container-max-width: 1280px;
    --section-padding: 100px 5%;
    --border-radius-lg: 32px;
    --border-radius-md: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. 全局基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-light);
    color: var(--color-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

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

ul {
    list-style: none;
}

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

/* 3. 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 50px; /* 胶囊型 */
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
}

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

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

/* 4. 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    font-weight: 500;
    color: var(--color-text-muted);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 5. Hero Section 样式 */
.hero {
    display: flex;
    align-items: center;
    padding: 160px 5% 100px;
    max-width: var(--container-max-width);
    margin: 0 auto;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.eyebrow {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    display: block;
}

.hero h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    max-width: 540px;
}

.hero-visual {
    flex: 1;
    position: relative;
}

/* 数据浮动卡片组件 */
.data-card {
    position: absolute;
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 16px 20px;
    border-radius: var(--border-radius-md);
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    animation: float 4s ease-in-out infinite;
}

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

/* 6. 通用卡片样式 (痛点展示) */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    padding: 0 5%;
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.card {
    background: #FAFAFA;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0,0,0,0.05);
}

.icon-box {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 1.5rem;
}

/* 7. 解决方案对比区 (深色背景) */
.comparison-section {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--section-padding);
    margin-top: 100px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid #333;
    margin-top: 40px;
}

.comparison-row {
    display: contents;
}

.comparison-cell {
    padding: 30px 20px;
    border-bottom: 1px solid #333;
}

.comparison-cell.header-cell {
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    font-size: 0.9rem;
}

/* 8. 价格方案 (Pricing) */
.pricing-section {
    padding: var(--section-padding);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: var(--container-max-width);
    margin: 0 auto;
    align-items: center;
}

.pricing-card {
    padding: 50px 40px;
    border-radius: var(--border-radius-lg);
    border: 1px solid #EEE;
    text-align: center;
}

.pricing-card.featured {
    background-color: var(--color-bg-dark);
    color: white;
    transform: scale(1.05);
    box-shadow: 0 40px 80px rgba(0,0,0,0.15);
    border: none;
}

.price {
    font-size: 3.5rem;
    font-weight: 800;
    margin: 20px 0;
}

.price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-dim);
}

/* 9. 页脚样式 (Footer) */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: 80px 5% 40px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    max-width: var(--container-max-width);
    margin: 0 auto 60px;
}

.footer-info {
    max-width: 300px;
}

.footer-info .logo {
    margin-bottom: 20px;
    display: block;
}

.footer-nav {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    margin-bottom: 24px;
    font-size: 1rem;
    color: var(--color-accent);
}

.footer-column a {
    display: block;
    margin-bottom: 12px;
    color: var(--color-text-dim);
}

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

.footer-bottom {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding-top: 40px;
    border-top: 1px solid #333;
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--color-text-dim);
}

/* 10. 响应式媒体查询 */

/* Tablet */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 120px;
    }
    
    .hero-description {
        margin: 0 auto 40px;
    }

    .card-grid, .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comparison-grid {
        font-size: 0.9rem;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* 通常手机端改用汉堡菜单，此处简化隐藏 */
    }
    
    .header {
        padding: 15px 5%;
    }

    .card-grid, .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-row {
        display: block;
        margin-bottom: 30px;
        border: 1px solid #333;
        border-radius: 16px;
    }
    
    .comparison-cell {
        border-bottom: none;
    }

    .footer-top {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-nav {
        gap: 40px;
        flex-wrap: wrap;
    }
}

/* 11. 实用工具类 */
.text-accent { color: var(--color-accent); }
.bg-pastel-orange { background-color: var(--color-pastel-orange); }
.bg-pastel-blue { background-color: var(--color-pastel-blue); }
.bg-pastel-red { background-color: var(--color-pastel-red); }

.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 5%;
}

.hide-mobile {
    @media (max-width: 768px) { display: none; }
}