/* Reset and Base Styles */
:root {
    --primary-color: #0e6ee6;
    --primary-hover: #0c5bc0;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #ffffff;
    --bg-light: #f5f7fa;
    --border-color: #eaeaea;
    --border-radius: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

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

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

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    list-style-position: inside;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
.site-header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.main-nav a {
    color: var(--text-light);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    text-decoration: none;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary-color);
    background: var(--bg-light);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(14, 110, 230, 0.2);
}

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

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

/* Hero Section */
.hero-section {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
}

.hero-section h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #1a1a1a;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Features */
.features-section {
    padding: 60px 20px;
}

.features-section h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 30px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.25rem;
}

/* Download Section */
.download-section {
    padding: 60px 0;
}

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

.download-section h2 {
    text-align: center;
    margin-bottom: 15px;
}

.download-tip {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 40px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.download-card {
    background: var(--bg-color);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.download-card h3 {
    border-bottom: 2px solid var(--bg-light);
    padding-bottom: 15px;
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.download-card ul {
    list-style: none;
    margin-bottom: 20px;
}

.download-card li {
    margin-bottom: 12px;
}

.download-link {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
}

.sys-req {
    font-size: 0.85rem;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

/* SEO Content / Single Article */
.seo-content, .single-article {
    padding: 60px 20px;
    max-width: 800px;
    margin: 0 auto;
}

.seo-content h2, .single-article h1, .single-article h2 {
    margin: 30px 0 15px;
    color: #222;
}

.seo-content p, .article-content p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.post-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.note-box {
    background-color: #eef5ff;
    border-left: 4px solid var(--primary-color);
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 0 4px 4px 0;
}

.article-content ol {
    margin-bottom: 20px;
    padding-left: 20px;
}

.article-content li {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

/* FAQ */
.faq-list {
    margin-top: 40px;
}

.faq-item {
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.faq-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: #222;
}

/* Footer */
.site-footer {
    background: #1a1a1a;
    color: #aaa;
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
}

.site-footer p {
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.site-footer a {
    color: #ddd;
}

.site-footer a:hover {
    color: #fff;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-wrapper {
        flex-direction: column;
        height: auto;
        padding: 15px 0;
    }
    
    .main-nav ul {
        margin-top: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
}