:root {
    --primary-color: #6a11cb; /* Tech Purple */
    --secondary-color: #2575fc; /* Tech Blue */
    --accent-color: #ff4b1f; /* Vibrant Orange for CTA */
    --text-dark: #1f1f1f;
    --text-light: #666666;
    --white: #ffffff;
    --bg-light: #f4f7f6;
    --border-radius: 10px;
    --shadow: 0 10px 20px rgba(0,0,0,0.08);
    --card-border: 1px solid #e1e1e1;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background-color: var(--white);
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: 1px;
}

.site-nav ul {
    display: flex;
    gap: 25px;
}

.site-nav a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
}

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

.site-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

.site-nav a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 100px 0;
    text-align: center;
    color: var(--white);
}

.hero-content h1 {
    font-size: 38px;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.hero-content p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 12px 35px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(255, 75, 31, 0.4);
}

.btn-primary:hover {
    background-color: #e03e15;
    transform: translateY(-2px);
}

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

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

/* Content Sections */
.content-section {
    padding: 70px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    border-left: 5px solid var(--primary-color);
    padding-left: 20px;
}

.section-title h2 {
    font-size: 26px;
    color: var(--text-dark);
    font-weight: 700;
}

.more {
    color: var(--text-light);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.3s;
}

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

/* Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 30px;
}

.info-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: var(--card-border);
    display: flex;
    flex-direction: column;
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.img-wrapper {
    width: 100%;
    height: 160px;
    background-color: #eee;
}

.gradient-box {
    width: 100%;
    height: 100%;
}

.card-text {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-text h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-dark);
    font-weight: 600;
}

.card-text p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* Article Section */
.article-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.seo-article {
    background: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    border: var(--card-border);
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}

.seo-article h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.seo-article p {
    font-size: 15px;
    color: var(--text-light);
    text-indent: 2em;
    text-align: justify;
    line-height: 1.8;
}

/* Footer */
.site-footer {
    background-color: #111;
    color: #bbb;
    padding: 60px 0 30px;
    margin-top: 60px;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    font-size: 26px;
    font-weight: bold;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-content p {
    font-size: 14px;
    margin-bottom: 25px;
    opacity: 0.8;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.footer-links {
    margin-bottom: 30px;
}

.footer-links a {
    margin: 0 15px;
    font-size: 14px;
    color: #888;
}

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

.copyright {
    border-top: 1px solid #333;
    padding-top: 20px;
    font-size: 12px;
    color: #666;
}

/* Responsive */
@media (max-width: 768px) {
    .site-nav {
        display: none; 
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .cta-group {
        flex-direction: column;
        gap: 15px;
        padding: 0 40px;
    }
    
    .card-grid {
        grid-template-columns: repeat(1, 1fr);
        gap: 20px;
    }
    
    .img-wrapper {
        height: 140px;
    }
}