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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    line-height: 1.6;
    color: #333;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: 2px;
}

.nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.nav-btn {
    background: rgba(255,255,255,0.1);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.nav-btn:hover, .nav-btn.active {
    background: rgba(255,255,255,0.2);
    transform: translateY(-1px);
}

.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.section {
    display: block;
}

.section.hidden {
    display: none;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    background: white;
    padding: 3rem 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.hero h2 {
    color: #764ba2;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.search-section {
    margin-bottom: 2rem;
    text-align: center;
}

.search-box {
    width: 100%;
    max-width: 500px;
    padding: 12px 20px;
    font-size: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    outline: none;
    transition: border-color 0.3s ease;
}

.search-box:focus {
    border-color: #764ba2;
}

.filters {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.filter-btn {
    background: white;
    color: #764ba2;
    border: 2px solid #764ba2;
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.filter-btn:hover, .filter-btn.active {
    background: #764ba2;
    color: white;
    transform: translateY(-2px);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.article-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    height: fit-content;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.article-header {
    padding: 1.5rem 1.5rem 1rem;
}

.article-meta {
    display: flex;
    gap: 10px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.category-tag {
    background: #764ba2;
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag {
    background: #e9ecef;
    color: #666;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
}

.date-tag {
    background: #e9ecef;
    color: #666;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.article-excerpt {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.read-more {
    background: #764ba2;
    color: white;
    padding: 8px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    margin: 0 1.5rem 1.5rem;
}

.read-more:hover {
    background: #667eea;
    transform: translateY(-1px);
}

.article-detail {
    background: white;
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.back-btn {
    background: #6c757d;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

.article-content h3 {
    color: #764ba2;
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    font-weight: 600;
}

.article-content ul {
    margin: 1rem 0 1rem 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.article-content strong {
    color: #764ba2;
}

.about-content {
    margin-top: 2rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.about-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.about-card:hover {
    transform: translateY(-5px);
}

.about-card h3 {
    color: #764ba2;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.disclaimer {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
}

.disclaimer h3 {
    color: #856404;
    margin-bottom: 1rem;
}

.disclaimer p {
    color: #856404;
    font-weight: 500;
}

.footer {
    background: #343a40;
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #764ba2;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p {
    color: #adb5bd;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.footer-section ul {
    list-style: none;
    color: #adb5bd;
}

.footer-section li {
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 2px 0;
}

.footer-section li:hover {
    color: #764ba2;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #495057;
    color: #adb5bd;
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .nav {
        justify-content: center;
        margin-top: 1rem;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

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

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

    .article-detail {
        padding: 2rem 1.5rem;
    }

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

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

    .filters {
        gap: 5px;
    }

    .filter-btn, .nav-btn {
        font-size: 0.8rem;
        padding: 6px 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

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

    .article-detail {
        padding: 1.5rem 1rem;
    }
}