:root{--color-bg: #f4f6f8;--color-surface: #ffffff;--color-border: #dfe3e8;--color-text: #12161f;--color-muted: #5c6472;--color-primary: #1f5fd0;--color-danger: #c0392b;--color-success: #12805c;--radius: 8px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--color-text)}*{box-sizing:border-box}body{margin:0;background:var(--color-bg)}a{color:var(--color-primary)}.layout{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{background:var(--color-surface);border-right:1px solid var(--color-border);padding:20px 16px;display:flex;flex-direction:column;gap:24px}.sidebar h1{font-size:16px;margin:0}.sidebar nav{display:flex;flex-direction:column;gap:4px}.sidebar nav a{padding:8px 10px;border-radius:var(--radius);text-decoration:none;color:var(--color-muted);font-size:14px}.sidebar nav a:hover{background:var(--color-bg)}.sidebar nav a.active{background:var(--color-primary);color:#fff}.main{padding:24px}.page-header{margin-bottom:20px}.page-header 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