.app{min-height:100vh;display:flex;flex-direction:column;max-width:1400px;margin:0 auto;padding:2rem}.header{text-align:center;margin-bottom:2rem}.header-top{display:flex;align-items:center;justify-content:center;gap:.75rem;position:relative;width:100%}.lang-switcher{position:absolute;right:0;top:50%;transform:translateY(-50%);padding:.25rem .5rem;font-size:.75rem;color:var(--text-secondary);background:transparent;border:1px solid var(--border-color, #e5e7eb);border-radius:4px;cursor:pointer;transition:color .2s,border-color .2s}.lang-switcher:hover{color:var(--text-primary);border-color:var(--text-secondary)}.header h1{font-size:1.75rem;font-weight:600;letter-spacing:-.02em;color:var(--text-primary)}.subtitle{margin-top:.25rem;font-size:.9rem;color:var(--text-secondary)}.toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;margin-bottom:1rem}.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:.5rem}.btn{padding:.5rem 1rem;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .15s ease;border:1px solid transparent;font-family:inherit}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:var(--bg-primary);border-color:var(--accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background:#30363d;border-color:var(--text-secondary)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover:not(:disabled){color:var(--text-primary);background:var(--bg-tertiary)}.indent-control{display:flex;align-items:center;gap:.5rem;font-size:.875rem;color:var(--text-secondary)}.indent-control select{padding:.35rem .6rem;border-radius:4px;border:1px solid var(--border);background:var(--bg-tertiary);color:var(--text-primary);font-size:.8rem;cursor:pointer}.error-banner{display:flex;align-items:center;gap:.5rem;padding:.75rem 1rem;background:#f8514926;border:1px solid rgba(248,81,73,.3);border-radius:6px;color:var(--error);font-size:.875rem;margin-bottom:1rem}.error-icon{font-weight:700;color:var(--error)}.editor-container{display:grid;grid-template-columns:1fr 1fr;gap:1rem;flex:1;min-height:400px}@media (max-width: 900px){.editor-container{grid-template-columns:1fr}}.panel{display:flex;flex-direction:column;background:var(--bg-secondary);border:1px solid var(--border);border-radius:8px;overflow:hidden}.panel-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:.6rem 1rem;font-size:.75rem;font-weight:500;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--border)}.validation-badge{font-size:.7rem;padding:.2rem .5rem;border-radius:4px;text-transform:none;font-weight:500}.validation-badge.valid{background:#3fb95033;color:var(--success)}.validation-badge.invalid{background:#f8514933;color:var(--error);max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.output-mode-badge{font-size:.7rem;padding:.2rem .5rem;border-radius:4px;background:var(--bg-tertiary);color:var(--text-secondary)}.panel-input,.panel-output{flex:1;min-height:300px;padding:1rem;font-family:JetBrains Mono,Fira Code,monospace;font-size:.85rem;line-height:1.6}.panel-input{background:var(--bg-primary);color:var(--text-primary);border:none;resize:none;outline:none}.panel-input::placeholder{color:var(--text-secondary);opacity:.6}.panel-output{background:var(--bg-primary);margin:0;overflow:auto;white-space:pre-wrap;word-break:break-all}.panel-output .placeholder{color:var(--text-secondary);opacity:.6}.json-key{color:var(--key)}.json-string{color:var(--string)}.json-number{color:var(--number)}.json-boolean{color:var(--boolean)}.json-null{color:var(--null)}.footer{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);text-align:center;font-size:.8rem;color:var(--text-secondary)}.footer-sponsor{margin:.5rem 0 0;font-size:.8rem;color:var(--text-secondary)}.footer-sponsor-link{margin-left:.25rem;color:var(--accent);text-decoration:none;transition:color .15s ease}.footer-sponsor-link:hover{color:var(--accent-hover);text-decoration:underline}:root{--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-tertiary: #21262d;--border: #30363d;--text-primary: #e6edf3;--text-secondary: #8b949e;--accent: #58a6ff;--accent-hover: #79b8ff;--success: #3fb950;--error: #f85149;--key: #7ee787;--string: #a5d6ff;--number: #79c0ff;--boolean: #ff7b72;--null: #8b949e}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Noto Sans SC,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}#root{min-height:100vh}