/* Knowledge Center Styles */

/* Hero Section */
.knowledge-hero {
    padding: 6rem 0;
    background: linear-gradient(180deg, var(--primary-navy) 0%, var(--secondary-navy) 100%);
    position: relative;
    overflow: hidden;
    margin-top: 70px;
}

.knowledge-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-gray) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-gray) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--white), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

/* Search Bar */
.search-bar {
    display: flex;
    background: var(--secondary-navy);
    border: 2px solid var(--border-gray);
    border-radius: 40px;
    overflow: hidden;
    transition: var(--transition-medium);
}

.search-bar:focus-within {
    border-color: var(--accent-blue);
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.3);
}

.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 1rem 1.5rem;
    color: var(--white);
    font-family: var(--font-body);
    font-size: 1rem;
}

.search-bar input::placeholder {
    color: var(--text-gray);
}

.search-bar input:focus {
    outline: none;
}

.search-bar button {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border: none;
    padding: 0 1.5rem;
    color: var(--white);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-bar button svg {
    width: 20px;
    height: 20px;
}

.search-bar button:hover {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
}

/* Categories Section */
.categories-section {
    padding: var(--spacing-lg) 0;
    background: var(--primary-navy);
    border-bottom: 1px solid var(--border-gray);
}

.categories {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.category-btn {
    padding: 0.6rem 1.5rem;
    background: var(--secondary-navy);
    border: 2px solid var(--border-gray);
    border-radius: 25px;
    color: var(--text-gray);
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-medium);
}

.category-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.category-btn.active {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border-color: var(--accent-blue);
    color: var(--white);
}

/* Featured Article */
.featured-article-section {
    padding: var(--spacing-lg) 0;
    background: linear-gradient(180deg, var(--primary-navy) 0%, var(--secondary-navy) 100%);
}

.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    background: var(--secondary-navy);
    border: 1px solid var(--border-gray);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition-medium);
}

.featured-article:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 15px 50px rgba(74, 144, 226, 0.2);
}

.featured-image {
    position: relative;
    height: 100%;
    min-height: 400px;
    overflow: hidden;
}

.featured-image .image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.featured-image .image-placeholder svg {
    width: 80px;
    height: 80px;
    opacity: 0.6;
}

.featured-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    padding: 0.5rem 1.2rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border-radius: 20px;
    color: var(--white);
    font-weight: 600;
    font-size: 0.9rem;
}

.featured-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.article-category {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    background: rgba(74, 144, 226, 0.2);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    width: fit-content;
    margin-bottom: var(--spacing-sm);
}

.article-category.school-erp {
    color: #667eea;
}

.article-category.rfid {
    color: #f093fb;
}

.article-category.cybersecurity {
    color: #4facfe;
}

.article-category.digital-transformation {
    color: #43e97b;
}

.featured-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.featured-excerpt {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-gray);
    font-size: 0.9rem;
}

.meta-item svg {
    width: 18px;
    height: 18px;
    color: var(--accent-blue);
}

.read-more {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: var(--white);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: var(--transition-medium);
    width: fit-content;
}

.read-more:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(74, 144, 226, 0.4);
}

/* Articles Grid */
.articles-section {
    padding: var(--spacing-lg) 0;
    background: var(--primary-navy);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.article-card {
    background: var(--secondary-navy);
    border: 1px solid var(--border-gray);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition-medium);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(74, 144, 226, 0.2);
}

.article-card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--primary-navy);
}

.article-card-image .image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-card-image .image-placeholder svg {
    width: 60px;
    height: 60px;
    opacity: 0.5;
}

.article-card-body {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.article-card .article-category {
    margin-bottom: var(--spacing-sm);
}

.article-card-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: var(--white);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    min-height: 3.2rem;
}

.article-card-excerpt {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.article-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-gray);
}

.article-read-time {
    color: var(--text-gray);
    font-size: 0.85rem;
}

.article-link {
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.article-link:hover {
    color: var(--accent-blue);
}

/* Newsletter Section */
.newsletter-section {
    padding: var(--spacing-lg) 0;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    position: relative;
    overflow: hidden;
}

.newsletter-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    pointer-events: none;
}

.newsletter-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.newsletter-content h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.newsletter-content > p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.newsletter-form input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 30px;
    background: var(--white);
    color: var(--primary-navy);
    font-family: var(--font-body);
    font-size: 1rem;
}

.newsletter-form input::placeholder {
    color: var(--text-gray);
}

.newsletter-form input:focus {
    outline: none;
}

.subscribe-btn {
    padding: 1rem 2.5rem;
    background: var(--white);
    border: none;
    border-radius: 30px;
    color: var(--accent-blue);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-medium);
    white-space: nowrap;
}

.subscribe-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.newsletter-note {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .featured-article {
        grid-template-columns: 1fr;
    }

    .featured-image {
        min-height: 300px;
    }

    .featured-title {
        font-size: 1.6rem;
    }

    .articles-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .search-bar {
        flex-direction: column;
    }

    .search-bar input {
        padding: 0.8rem 1.2rem;
    }

    .search-bar button {
        padding: 0.8rem 1.2rem;
    }

    .categories {
        gap: 0.5rem;
    }

    .category-btn {
        padding: 0.5rem 1.2rem;
        font-size: 0.9rem;
    }

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

    .newsletter-form {
        flex-direction: column;
    }

    .subscribe-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

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

    .article-card-title {
        font-size: 1.1rem;
    }

    .featured-content {
        padding: var(--spacing-sm);
    }

    .article-card-body {
        padding: var(--spacing-sm);
    }

    .newsletter-content h2 {
        font-size: 1.8rem;
    }
}