:root{color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Yu Gothic,sans-serif;--color-bg: #f4f6f9;--color-surface: #ffffff;--color-border: #dde3ea;--color-text: #1e2a3a;--color-text-muted: #5a6470;--color-primary: #2f6fed;--color-primary-dark: #1e2a3a;--color-success: #2ea05a;--color-warning: #e08e2b;--color-danger: #c0392b}*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-text)}button{font-family:inherit;cursor:pointer}input,select{font-family:inherit}a{color:var(--color-primary)}.app-shell{display:flex;min-height:100vh}.app-sidebar{width:220px;flex-shrink:0;background:var(--color-primary-dark);color:#fff;padding:24px 16px}.app-sidebar h1{font-size:16px;margin:0 0 24px}.app-sidebar nav{display:flex;flex-direction:column;gap:4px}.app-sidebar nav a{color:#c9d6e8;text-decoration:none;padding:10px 12px;border-radius:6px;font-size:14px}.app-sidebar nav a:hover,.app-sidebar nav a.active{background:#ffffff14;color:#fff}.app-main{flex:1;padding:32px 40px;overflow-y:auto}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.page-header h2{margin:0;font-size:22px}