:root{--accent: #2563eb;--accent-strong: #1d4ed8;--border: #d4d4d8;--bg: #f4f4f5;--danger: #b91c1c;--success: #15803d;--success-strong: #166534;--toolbar-h: 132px;--page-max: 720px;--page-gutter: 16px}*{box-sizing:border-box}html,body,#root{margin:0;height:100%}body{font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:#18181b}.app{display:flex;flex-direction:column;min-height:100%}.app-header{display:flex;align-items:center;gap:10px;padding:calc(10px + env(safe-area-inset-top)) 14px 10px;background:#fff;border-bottom:1px solid var(--border)}.app-title{flex:1;min-width:0;font-size:16px;font-weight:650;letter-spacing:.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-file-button,.logout-button{display:inline-flex;align-items:center;min-height:38px;padding:0 14px;border:1px solid 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