:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.app-header {
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.app-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

.app-content {
    padding: 2rem;
}

.input-group {
    display: flex;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.input-group input {
    flex: 1;
    padding: 1rem;
    border: none;
    font-size: 1rem;
    outline: none;
}

.input-group button {
    padding: 0 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.input-group button:hover {
    background-color: var(--secondary-color);
}

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

.examples p {
    margin-bottom: 0.5rem;
    color: #666;
}

.example-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.example-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    background-color: rgba(67, 97, 238, 0.1);
    transition: var(--transition);
}

.example-links a:hover {
    background-color: rgba(67, 97, 238, 0.2);
}

.error-message {
    padding: 1rem;
    background-color: #ffebee;
    color: #c62828;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feed-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.feed-header h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.visit-site {
    font-size: 0.9rem;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.visit-site:hover {
    text-decoration: underline;
}

.feed-description {
    color: #666;
    font-size: 0.95rem;
}

.feed-items {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.feed-item {
    padding: 1.5rem;
    border-radius: var(--border-radius);
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 1px solid #eee;
}

.feed-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.feed-item h3 {
    margin-bottom: 0.5rem;
}

.feed-item h3 a {
    color: var(--dark-color);
    text-decoration: none;
    transition: var(--transition);
}

.feed-item h3 a:hover {
    color: var(--primary-color);
}

.item-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 0.8rem;
}

.item-meta i {
    margin-right: 0.3rem;
}

.item-description {
    margin-bottom: 1rem;
    color: #444;
    font-size: 0.95rem;
    line-height: 1.7;
}

.item-description img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 0.5rem 0;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.read-more:hover {
    text-decoration: underline;
}

.app-footer {
    padding: 1.5rem;
    text-align: center;
    background-color: #f8f9fa;
    color: #666;
    font-size: 0.9rem;
}

.credits {
    margin-top: 0.3rem;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Loading spinner */
.loading-spinner {
    display: none;
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(67, 97, 238, 0.2);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .app-header h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .input-group input {
        width: 100%;
    }
    
    .input-group button {
        width: 100%;
        padding: 1rem;
        justify-content: center;
    }
    
    .example-links {
        flex-direction: column;
        align-items: center;
    }
}