:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-color: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

header p {
    color: var(--text-secondary);
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.api-card {
    padding: 15px;
}

.api-settings {
    display: flex;
    gap: 10px;
}

.api-settings input {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.controls input,
.controls select {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--text-secondary);
    color: white;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.news-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.news-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

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

.news-content {
    padding: 20px;
}

.news-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-color);
    line-height: 1.4;
}

.news-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
    line-height: 1.5;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.news-source {
    font-weight: 600;
    color: var(--primary-color);
}

.news-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.bookmark-btn {
    padding: 6px 12px;
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    background: white;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.9rem;
}

.bookmark-btn.bookmarked {
    background-color: var(--primary-color);
    color: white;
}

@media (max-width: 768px) {
    .controls {
        flex-direction: column;
    }

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

    .api-settings {
        flex-direction: column;
    }
}