/* ============================================
   Knowledge Center Example - Style Sheet
   Professional gardening knowledge hub
   ============================================ */

/* ============================================
   1. RESET & BASE STYLES
   ============================================ */

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

:root {
    /* Colors */
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #81C784;
    --secondary-color: #8BC34A;
    --accent-color: #FF9800;
    --text-dark: #212121;
    --text-gray: #555555;
    --text-light: #888888;
    --bg-light: #F5F5F5;
    --bg-white: #FFFFFF;
    --border-color: #E0E0E0;

    /* Typography */
    --font-main: 'Heebo', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   2. HEADER & NAVIGATION
   ============================================ */

.site-header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
}

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

.main-nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-nav {
    background: var(--primary-color);
    color: white !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: background 0.3s;
}

.btn-nav:hover {
    background: var(--primary-dark);
}

/* ============================================
   3. HERO SECTION
   ============================================ */

.hero {
    background: linear-gradient(135deg, #4CAF50 0%, #8BC34A 100%);
    color: white;
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.title-highlight {
    color: #FFF59D;
    font-size: 0.7em;
    font-weight: 600;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: #FFF59D;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* ============================================
   4. SECTIONS
   ============================================ */

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-dark);
}

/* ============================================
   5. CATEGORIES SECTION
   ============================================ */

.categories {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-light);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-dark);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.category-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.category-card p {
    color: var(--text-gray);
    flex-grow: 1;
}

.category-count {
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ============================================
   6. FEATURED GUIDES SECTION
   ============================================ */

.featured-guides {
    padding: var(--spacing-xxl) 0;
    background: white;
}

.guides-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.guide-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
    transition: all 0.3s ease;
}

.guide-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.guide-icon {
    font-size: 4rem;
    min-width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.guide-content {
    flex: 1;
}

.guide-category {
    display: inline-block;
    background: var(--primary-light);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.guide-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.guide-excerpt {
    color: var(--text-gray);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.guide-meta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
    font-size: 0.9rem;
}

.guide-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-read-guide {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-read-guide:hover {
    background: var(--primary-dark);
    gap: var(--spacing-sm);
}

/* ============================================
   7. CTA SECTION
   ============================================ */

.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-xxl) 0;
    text-align: center;
    color: white;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

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

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s;
}

.btn-primary {
    background: white;
    color: #667eea;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ============================================
   8. FOOTER
   ============================================ */

.site-footer {
    background: #2C3E50;
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.footer-column h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--secondary-color);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-contact {
    list-style: none;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

.powered-by {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
}

.powered-by strong {
    color: var(--secondary-color);
}

/* ============================================
   9. RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

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

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .guide-card {
        flex-direction: column;
        text-align: center;
    }

    .guide-icon {
        min-width: auto;
    }

    .guide-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .guide-title {
        font-size: 1.3rem;
    }
}