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

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

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

/* Header styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.header-content {
    text-align: center;
    margin-bottom: 20px;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.title i {
    color: #f6ad55;
    font-size: 2.2rem;
}

.subtitle {
    font-size: 1.1rem;
    color: #718096;
    font-weight: 400;
}

/* Bitcoin Price Display */
.btc-price-container {
    margin-top: 20px;
    padding: 15px 25px;
    background: linear-gradient(135deg, rgba(247, 147, 26, 0.1) 0%, rgba(247, 147, 26, 0.05) 100%);
    border: 1px solid rgba(247, 147, 26, 0.2);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    display: inline-block;
}

.btc-price {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
}

.btc-price i {
    color: #f7931a;
    font-size: 1.4rem;
}

.price-label {
    color: #718096;
    font-weight: 500;
}

.price-value {
    color: #2d3748;
    font-weight: 700;
    font-size: 1.3rem;
}

.price-change {
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
}

.price-change.positive {
    background: rgba(72, 187, 120, 0.1);
    color: #059669;
    border: 1px solid rgba(72, 187, 120, 0.2);
}

.price-change.negative {
    background: rgba(229, 62, 62, 0.1);
    color: #dc2626;
    border: 1px solid rgba(229, 62, 62, 0.2);
}

.price-change.neutral {
    background: rgba(160, 174, 192, 0.1);
    color: #718096;
    border: 1px solid rgba(160, 174, 192, 0.2);
}

.price-update-time {
    text-align: center;
    margin-top: 8px;
    color: #a0aec0;
    font-size: 0.8rem;
}

/* Loading animation for price */
@keyframes priceLoading {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.price-value.loading {
    animation: priceLoading 1.5s ease-in-out infinite;
}

.header-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.refresh-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.refresh-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.refresh-btn:active {
    transform: translateY(0);
}

.source-filter {
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    background: white;
    color: #2d3748;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 200px;
}

.source-filter:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Loading styles */
.loading-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.loading-spinner i {
    font-size: 3rem;
    margin-bottom: 15px;
    color: #f6ad55;
}

.loading-spinner p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Stats container */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

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

.stat-card i {
    font-size: 2rem;
    color: #667eea;
    margin-bottom: 15px;
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #2d3748;
}

.stat-label {
    font-size: 0.9rem;
    color: #718096;
    font-weight: 500;
}

/* Main content */
.main-content {
    margin-bottom: 30px;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

/* News article card */
.news-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.news-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.news-content {
    padding: 25px;
}

.news-source {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    color: #718096;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: #a0aec0;
}

.news-date {
    display: flex;
    align-items: center;
    gap: 5px;
}

.news-date i {
    font-size: 0.8rem;
}

/* Error container */
.error-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.error-message {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 500px;
}

.error-message i {
    font-size: 3rem;
    color: #e53e3e;
    margin-bottom: 20px;
}

.error-message h3 {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 15px;
}

.error-message p {
    color: #718096;
    margin-bottom: 25px;
}

.retry-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .title {
        font-size: 2rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .title i {
        font-size: 1.8rem;
    }
    
    .btc-price-container {
        margin-top: 15px;
        padding: 12px 20px;
    }
    
    .btc-price {
        font-size: 1rem;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .btc-price i {
        font-size: 1.2rem;
    }
    
    .price-value {
        font-size: 1.1rem;
    }
    
    .price-change {
        font-size: 0.8rem;
        min-width: 50px;
    }
    
    .header-actions {
        flex-direction: column;
        gap: 15px;
    }
    
    .source-filter {
        min-width: 100%;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .news-card {
        margin-bottom: 0;
    }
    
    .news-content {
        padding: 20px;
    }
    
    .news-title {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .refresh-btn, .retry-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .source-filter {
        padding: 10px 12px;
        font-size: 0.9rem;
    }
    
    .stat-card {
        padding: 20px;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .news-content {
        padding: 15px;
    }
}

/* Animation for loading */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-card {
    animation: fadeIn 0.6s ease-out;
}

/* Smooth transitions */
* {
    transition: all 0.3s ease;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: rgba(102, 126, 234, 0.5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(102, 126, 234, 0.7);
}