:root{--color-bg: #fafafa;--color-surface: #ffffff;--color-border: #e6e6e6;--color-text: #1a1a1a;--color-text-muted: #6b7280;--color-accent: #ea580c;--color-accent-fg: #ffffff;color-scheme:light}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;background:var(--color-bg);color:var(--color-text);font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif}a{color:inherit}button{font:inherit;border:1px solid var(--color-border);background:var(--color-surface);padding:6px 12px;border-radius:6px;cursor:pointer}button.primary{background:var(--color-accent);color:var(--color-accent-fg);border-color:var(--color-accent)}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{font:inherit;border:1px solid var(--color-border);background:var(--color-surface);padding:6px 8px;border-radius:6px}.app-shell{display:grid;grid-template-columns:220px 1fr;height:100vh}.sidebar{border-right:1px solid var(--color-border);background:var(--color-surface);padding:16px}.sidebar h1{margin:0 0 16px;font-size:18px;font-weight:600}.sidebar nav{display:flex;flex-direction:column;gap:4px}.sidebar nav a{text-decoration:none;padding:6px 10px;border-radius:6px;color:var(--color-text)}.sidebar nav a.active{background:var(--color-accent);color:var(--color-accent-fg)}.main{overflow:auto;padding:24px}.split{display:grid;grid-template-columns:320px 1fr;gap:16px;height:calc(100vh - 48px)}.list{border:1px solid var(--color-border);background:var(--color-surface);border-radius:8px;overflow:auto}.list-item{padding:12px;border-bottom:1px solid var(--color-border);cursor:pointer}.list-item:hover{background:#f3f4f6}.list-item.selected{background:#fff7ed}.row{display:flex;gap:8px;align-items:center}.muted{color:var(--color-text-muted)}.spacer{flex:1}.editor-frame{border:1px solid var(--color-border);background:var(--color-surface);border-radius:8px;height:calc(100vh - 240px);overflow:hidden}.error{padding:12px;color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:6px}