:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --header-height: 60px;
}

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

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    height: var(--header-height);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

main {
    max-width: 800px;
    margin: calc(var(--header-height) + 2rem) auto 4rem;
    padding: 0 1rem;
}

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

.article-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.article-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.article-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.article-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    color: var(--primary-color);
}

.article-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
}

.article-content p {
    margin-bottom: 1.5rem;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 1.5rem 0;
}

.article-content ul, .article-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content pre {
    background-color: #f1f5f9;
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.article-content code {
    font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    font-size: 0.9rem;
}

blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin-left: 0;
    margin-right: 0;
    font-style: italic;
    color: var(--text-light);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 2rem 0;
}

.tag {
    background-color: #e0e7ff;
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
}

.share-section {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.share-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.share-buttons {
    display: flex;
    gap: 1rem;
}

.share-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.5rem 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

footer {
    background-color: var(--card-bg);
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .article-title {
        font-size: 2rem;
    }
    
    .article-content {
        padding: 1.5rem;
    }
}

.converter-form {
    background-color: #f8fafc;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.calculation-mode {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.calculation-mode label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-color);
}

.calculation-mode input[type="radio"] {
    margin: 0;
}

.calc-mode {
    transition: all 0.3s ease;
}

.form-row {
    display: flex;
    gap: 1rem;
    align-items: end;
    flex-wrap: wrap;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    min-width: 120px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--card-bg);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.form-group button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 1rem;
    align-self: flex-start;
}

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

.conversion-result {
    background-color: #f8fafc;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.conversion-result h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result-item {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-color);
}

.result-unit {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

.formula-display {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f1f5f9;
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}

.formula-display strong {
    color: var(--text-color);
    font-size: 0.9rem;
}

.formula-display code {
    display: block;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: var(--card-bg);
    border-radius: 4px;
    font-family: 'SF Mono', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.scenario-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.scenario-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.scenario-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.scenario-card p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.example-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 1rem;
    width: 100%;
}

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

.reference-table {
    margin: 1.5rem 0;
    overflow-x: auto;
}

.reference-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.reference-table th,
.reference-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.reference-table th {
    background-color: #f8fafc;
    font-weight: 600;
    color: var(--text-color);
}

.reference-table td {
    font-size: 0.9rem;
}

.reference-table tr:last-child td {
    border-bottom: none;
}

.reference-table tr:hover {
    background-color: #f8fafc;
}

.search-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--card-bg);
    transition: border-color 0.3s ease;
    margin-bottom: 0.5rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.search-results {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--card-bg);
    margin-bottom: 1rem;
}

.search-result-item {
    padding: 0.75rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.search-result-item:hover {
    background-color: #f1f5f9;
}

.search-result-item:last-child {
    border-bottom: none;
}

.error-message {
    background-color: #fee2e2;
    color: #991b1b;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid #fca5a5;
    margin: 1rem 0;
}

.success-message {
    background-color: #d1fae5;
    color: #065f46;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid #a7f3d0;
    margin: 1rem 0;
}

@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .form-group {
        min-width: auto;
    }
    
    .form-group button {
        align-self: stretch;
    }
}