:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --success-color: #27ae60;
    --text-color: #333;
    --bg-color: #ecf0f1;
    --surface-color: #ffffff;
    --border-color: #bdc3c7;
    --muted-color: #5f6b76;
    --demo-bg: #f8f9fa;
    --danger-color: #c0392b;
}

body.article-page {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
}

.article-layout {
    padding: 20px;
}

.article-shell {
    max-width: 900px;
    margin: 0 auto;
    background: var(--surface-color);
    padding: 40px 50px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.article-header {
    margin-bottom: 32px;
}

.article-title {
    font-size: 1.8em;
    line-height: 1.4;
    color: var(--primary-color);
    margin: 0 0 10px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-color);
}

.article-meta {
    margin-bottom: 16px;
}

.article-date {
    display: inline-block;
    color: var(--muted-color);
    font-size: 0.9em;
}

.article-lead > :last-child {
    margin-bottom: 0;
}

.article-section + .article-section {
    margin-top: 40px;
}

.article-entry h2 {
    font-size: 1.4em;
    margin: 0 0 15px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--secondary-color);
}

.article-entry h3 {
    font-size: 1.1em;
    margin-top: 25px;
    margin-bottom: 14px;
    color: #444;
    border-left: 4px solid var(--accent-color);
    padding-left: 10px;
}

.article-entry h4 {
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.article-entry p,
.article-entry ul,
.article-entry ol,
.article-entry table,
.article-entry pre,
.article-entry .article-note {
    margin-bottom: 1.2em;
}

.article-entry a {
    color: #1d4f91;
}

.article-entry pre {
    background-color: #24292e;
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
}

.article-entry code {
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 0.9em;
}

.article-entry p code,
.article-entry li code,
.article-entry td code,
.article-entry dd code {
    background-color: rgba(27, 31, 35, 0.06);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    color: #c0392b;
}

.article-entry code a {
    text-decoration: none;
    color: #c0392b;
}

.article-entry code a:hover {
    text-decoration: underline;
}

.article-entry table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

.article-entry th,
.article-entry td {
    border: 1px solid var(--border-color);
    padding: 10px 12px;
    text-align: left;
    vertical-align: top;
}

.article-entry th {
    background-color: #f7f9fa;
    color: var(--secondary-color);
    font-weight: 600;
}

.article-entry tr:nth-child(even) {
    background-color: #fafbfc;
}

.article-demo {
    background-color: var(--demo-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 30px;
}

.article-demo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.field-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.field-group {
    margin-bottom: 18px;
}

.field-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 0.95em;
}

.field-group input,
.field-group textarea,
.field-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font: inherit;
    background: #fff;
}

.button {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-weight: 700;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.button:hover {
    background-color: #2980b9;
}

.button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.button-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.media-frame {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: #0f1720;
}

.surface-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    margin-top: 16px;
}

.meta-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 16px;
}

.meta-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
}

.meta-label {
    display: block;
    color: var(--muted-color);
    font-size: 0.85em;
    margin-bottom: 4px;
}

.meta-value {
    font-weight: 700;
    color: var(--primary-color);
    word-break: break-word;
}

.status-text {
    margin-top: 14px;
    font-weight: 600;
    color: var(--secondary-color);
}

.status-text.error {
    color: var(--danger-color);
}

.muted-text {
    font-size: 0.92em;
    color: var(--muted-color);
}

.article-note {
    padding: 14px 16px;
    border-left: 4px solid var(--accent-color);
    background: #f4f8fb;
    border-radius: 6px;
}

@media (max-width: 760px) {
    .article-layout {
        padding: 14px;
    }

    .article-shell {
        padding: 20px;
    }

    .article-demo-grid,
    .field-grid,
    .meta-grid {
        grid-template-columns: 1fr;
    }
}