:root{--bg: #f1f5f9;--panel: #ffffff;--text: #0f172a;--muted: #475569;--border: #cbd5e1;--accent: #2563eb;--danger: #b91c1c}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app-shell{max-width:1320px;margin:0 auto;padding:20px;font-family:IBM Plex Sans,ui-sans-serif,system-ui,sans-serif}.app-header h1{margin:0 0 4px}.app-header p{margin:4px 0}.privacy{color:var(--muted);font-size:14px}.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:12px}.import-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:12px 0}.dropzone.dragover{outline:2px solid var(--accent);background:#eff6ff}.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}button,input,select,textarea{border:1px solid var(--border);border-radius:8px;padding:8px;font:inherit}button{background:#f8fafc;cursor:pointer}button:hover{border-color:#94a3b8}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(37,99,235,.35);outline-offset:1px}button:disabled{opacity:.6;cursor:not-allowed}fieldset{border:1px solid var(--border);border-radius:8px;margin:8px 0}.inline-check{margin-right:10px}.error-text{color:var(--danger)}.error-banner{border-color:#ef4444;background:#fef2f2}.status-line{color:var(--muted)}.empty{color:var(--muted);font-style:italic}.muted{color:var(--muted);font-size:13px}.editor-grid{display:grid;grid-template-columns:360px 1fr;gap:12px}.file-list{list-style:none;margin:8px 0 0;padding:0;max-height:520px;overflow:auto}.file-list li{padding:4px 0;border-bottom:1px solid #e2e8f0}.file-btn{width:100%;text-align:left}textarea{width:100%;min-height:240px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.diff-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.diff-grid textarea{min-height:210px}.toasts{position:fixed;right:16px;top:16px;z-index:1000;display:grid;gap:8px}.toast{color:#fff;padding:10px 12px;border-radius:8px}.toast.success{background:#166534}.toast.error{background:#991b1b}.help code{background:#e2e8f0;padding:2px 4px;border-radius:4px}@media(max-width:1100px){.import-grid,.editor-grid,.diff-grid{grid-template-columns:1fr}}