/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    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 4px 20px rgba(0, 0, 0, 0.1);
    padding: 2rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: #4a5568;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.tagline {
    font-size: 1.1rem;
    color: #718096;
    font-weight: 300;
}

/* Loading styles */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e2e8f0;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

.loading p {
    color: #4a5568;
    font-size: 1.1rem;
}

/* Article grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding-bottom: 3rem;
}

/* Article cards */
.article {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.article:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.article-header {
    margin-bottom: 1.5rem;
}

.article-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
    color: #718096;
}

.date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-summary {
    color: #4a5568;
    line-height: 1.7;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.article-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white !important;
    text-decoration: none !important;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.article-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.arrow {
    transition: transform 0.3s ease;
}

.article-link:hover .arrow {
    transform: translateX(4px);
}

/* Error message */
.error-message {
    text-align: center;
    padding: 3rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    grid-column: 1 / -1;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.error-message h3 {
    color: #e53e3e;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.error-message p {
    color: #718096;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.retry-btn {
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header {
        padding: 1.5rem 0;
        margin-bottom: 2rem;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .article-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .article {
        padding: 1.5rem;
    }
    
    .article-title {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.8rem;
    }
    
    .article {
        padding: 1.25rem;
    }
    
    .article-title {
        font-size: 1.2rem;
    }
}