/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.logo-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3498db, #e74c3c);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.logo-icon:hover {
    transform: scale(1.1) rotate(360deg);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
    background: linear-gradient(45deg, #3498db, #e74c3c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navigation {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(45deg, #3498db, #e74c3c);
    transition: width 0.3s ease;
}

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

.nav-menu a:hover {
    color: #3498db;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 3px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #2c3e50;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px); }
    100% { transform: translateY(-100px); }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: slideInUp 1s ease;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
    animation: slideInUp 1s ease 0.2s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    margin-top: 40px;
    animation: slideInUp 1s ease 0.4s both;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #f39c12;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Main Content */
.main-content {
    background: white;
    margin-top: -50px;
    position: relative;
    z-index: 3;
    border-radius: 20px 20px 0 0;
    padding: 80px 0;
}

/* Keyword Sections */
.keyword-sections {
    margin-bottom: 60px;
}

.keyword-section {
    margin-bottom: 80px;
    padding: 40px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.keyword-section:hover {
    transform: translateY(-5px);
}

.keyword-section h2 {
    color: #2c3e50;
    font-size: 2.2rem;
    margin-bottom: 30px;
    text-align: center;
    position: relative;
}

.keyword-section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(45deg, #3498db, #e74c3c);
    border-radius: 2px;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.content-item {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid #3498db;
}

.content-item:hover {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    transform: translateY(-3px);
}

.content-item h3 {
    color: #2c3e50;
    font-size: 1.4rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.content-item p {
    color: #555;
    line-height: 1.7;
    text-align: justify;
}

.content-item a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.content-item a:hover {
    color: #e74c3c;
    text-decoration: underline;
}

/* Main Articles */
.main-articles {
    margin-top: 60px;
}

.featured-article {
    background: white;
    padding: 50px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
    transition: all 0.3s ease;
}

.featured-article:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    transform: translateY(-5px);
}

.featured-article h2 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-align: center;
    position: relative;
}

.featured-article h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(45deg, #f39c12, #e74c3c);
    border-radius: 2px;
}

.featured-article h3 {
    color: #3498db;
    font-size: 1.6rem;
    margin: 30px 0 15px;
    font-weight: 600;
}

.featured-article p {
    color: #555;
    line-height: 1.8;
    margin-bottom: 20px;
    text-align: justify;
}

.featured-article ul {
    margin: 20px 0;
    padding-left: 30px;
}

.featured-article li {
    color: #555;
    margin-bottom: 10px;
    line-height: 1.6;
}

.featured-article li strong {
    color: #2c3e50;
}

.featured-article a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.featured-article a:hover {
    color: #e74c3c;
    text-decoration: underline;
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 60px 0 20px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    color: #f39c12;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.footer-section h4 {
    color: #3498db;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.footer-section p {
    line-height: 1.6;
    margin-bottom: 15px;
    opacity: 0.9;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #f39c12;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.social-links a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: #3498db;
}

.social-media {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.social-media a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 8px 12px;
    border: 1px solid #555;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.social-media a:hover {
    background: #3498db;
    border-color: #3498db;
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #555;
    opacity: 0.8;
}

.footer-bottom a {
    color: #f39c12;
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        gap: 15px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .content-item {
        padding: 20px;
    }
    
    .featured-article {
        padding: 30px 20px;
    }
    
    .featured-article h2 {
        font-size: 2rem;
    }
    
    .keyword-section {
        padding: 30px 20px;
    }
    
    .keyword-section h2 {
        font-size: 1.8rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .social-media {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .featured-article h2 {
        font-size: 1.6rem;
    }
    
    .keyword-section h2 {
        font-size: 1.5rem;
    }
    
    .content-item h3 {
        font-size: 1.2rem;
    }
}

/* Print Styles */
@media print {
    .header,
    .hero,
    .footer {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
        padding: 20px 0;
    }
    
    .keyword-section,
    .featured-article {
        box-shadow: none;
        border: 1px solid #ccc;
        margin-bottom: 20px;
        page-break-inside: avoid;
    }
    
    a {
        color: #000 !important;
        text-decoration: underline !important;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .hero {
        background: #000;
        color: #fff;
    }
    
    .keyword-section {
        background: #fff;
        border: 2px solid #000;
    }
    
    .content-item {
        border: 1px solid #000;
    }
}

/* Focus Styles for Accessibility */
a:focus,
button:focus {
    outline: 3px solid #3498db;
    outline-offset: 2px;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(45deg, #3498db, #e74c3c);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 1000;
}

.scroll-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.scroll-to-top.visible {
    display: flex;
}