:root{--color-bg: #FAFAF8;--color-bg-elevated: #FFFFFF;--color-bg-code: #F5F5F0;--color-bg-code-lines: #EEEEE8;--color-text: #1A1A1A;--color-text-muted: #6B7280;--color-text-subtle: #9CA3AF;--color-primary: #0D7377;--color-primary-hover: #0A5C5F;--color-primary-light: #E6F2F2;--color-secondary: #374151;--color-secondary-hover: #1F2937;--color-border: #E5E5E0;--color-border-strong: #D1D1C8;--color-error: #DC2626;--color-error-bg: #FEF2F2;--color-success: #059669;--font-mono: "JetBrains Mono", "Fira Code", "SF Mono", monospace;--font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;--header-height: 64px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .08);--transition-fast: .15s ease;--transition-normal: .25s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:var(--font-sans);font-size:14px;line-height:1.5;color:var(--color-text);background-color:var(--color-bg);background-image:linear-gradient(to right,var(--color-border) 1px,transparent 1px),linear-gradient(to bottom,var(--color-border) 1px,transparent 1px);background-size:24px 24px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{display:flex;flex-direction:column;height:100%;min-height:100vh}.header{display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 24px;background:var(--color-bg-elevated);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-sm);z-index:100}.header-brand{display:flex;align-items:center;gap:12px}.header-logo{width:28px;height:28px;color:var(--color-primary)}.header-title{font-family:var(--font-mono);font-size:18px;font-weight:600;letter-spacing:-.02em;color:var(--color-text)}.header-badge{padding:3px 8px;font-family:var(--font-mono);font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.05em;color:var(--color-primary);background:var(--color-primary-light);border-radius:var(--radius-sm)}.version-badge{padding:3px 8px;font-family:var(--font-mono);font-size:11px;font-weight:500;color:var(--color-text-muted);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-sm)}.header-controls{display:flex;align-items:center;gap:16px}.sample-select-label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--color-text-muted)}.sample-select{padding:6px 32px 6px 12px;font-family:var(--font-sans);font-size:13px;color:var(--color-text);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6,9 12,15 18,9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.sample-select:hover{border-color:var(--color-border-strong)}.sample-select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.main{display:grid;grid-template-columns:1fr 1fr;gap:1px;flex:1;background:var(--color-border);overflow:hidden}.panel{display:flex;flex-direction:column;background:var(--color-bg-elevated);overflow:hidden}.panel-input{padding:20px;gap:16px;overflow-y:auto}.panel-output{display:flex;flex-direction:column}.editor-group{display:flex;flex-direction:column;min-height:0}.editor-header{display:flex;align-items:center;justify-content:space-between;padding:8px 0}.editor-label{font-family:var(--font-mono);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text)}.editor-hint{font-family:var(--font-mono);font-size:11px;color:var(--color-text-subtle)}.editor-wrapper{display:flex;flex:1;min-height:120px;border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;background:var(--color-bg-code);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);resize:vertical}.editor-wrapper:focus-within{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.editor-wrapper-small{min-height:80px;max-height:200px}.editor-wrapper-autofit{flex:none;height:auto;max-height:300px}.line-numbers{display:flex;flex-direction:column;padding:12px 0;min-width:40px;font-family:var(--font-mono);font-size:13px;line-height:1.6;text-align:right;color:var(--color-text-subtle);background:var(--color-bg-code-lines);border-right:1px solid var(--color-border);user-select:none;overflow:hidden}.line-numbers span{padding:0 12px 0 8px}.editor-textarea{flex:1;padding:12px;font-family:var(--font-mono);font-size:13px;line-height:1.6;color:var(--color-text);background:transparent;border:none;resize:none;outline:none;tab-size:2;white-space:pre;overflow-wrap:normal;overflow-x:auto}.editor-textarea::placeholder{color:var(--color-text-subtle)}.context-details{border-radius:var(--radius-md)}.context-summary{display:flex;align-items:center;gap:8px;padding:10px 12px;font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--color-text-muted);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;user-select:none;transition:all var(--transition-fast)}.context-summary:hover{background:var(--color-bg-code);border-color:var(--color-border-strong)}.context-summary::-webkit-details-marker{display:none}.chevron-icon{width:16px;height:16px;transition:transform var(--transition-fast)}.context-details[open] .chevron-icon{transform:rotate(90deg)}.context-details[open] .context-summary{border-bottom-left-radius:0;border-bottom-right-radius:0;border-bottom-color:transparent}.context-group{padding:12px;background:var(--color-bg);border:1px solid var(--color-border);border-top:none;border-bottom-left-radius:var(--radius-md);border-bottom-right-radius:var(--radius-md)}.action-bar{display:flex;align-items:center;gap:12px;padding-top:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;font-family:var(--font-sans);font-size:14px;font-weight:500;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);position:relative}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-icon{width:16px;height:16px;flex-shrink:0}.btn-primary{color:#fff;background:var(--color-primary)}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{color:#fff;background:var(--color-secondary)}.btn-secondary:hover:not(:disabled){background:var(--color-secondary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.dto-group{display:flex;align-items:center}.dto-group .btn{border-top-right-radius:0;border-bottom-right-radius:0}.lang-select{padding:10px 32px 10px 12px;font-family:var(--font-sans);font-size:13px;color:var(--color-text);background:var(--color-bg);border:1px solid var(--color-border);border-left:none;border-top-right-radius:var(--radius-md);border-bottom-right-radius:var(--radius-md);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6,9 12,15 18,9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;transition:all var(--transition-fast)}.lang-select:hover{background-color:var(--color-bg-code)}.lang-select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.btn-spinner{display:none;width:14px;height:14px;border:2px solid transparent;border-top-color:currentColor;border-radius:50%;animation:spin .6s linear infinite}.btn.loading .btn-text{opacity:.5}.btn.loading .btn-spinner{display:block}.btn.loading .btn-icon{display:none}@keyframes spin{to{transform:rotate(360deg)}}.output-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--color-bg-code-lines);border-bottom:1px solid var(--color-border)}.output-label{font-family:var(--font-mono);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text)}.btn-copy{display:flex;align-items:center;justify-content:center;width:32px;height:32px;padding:0;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast)}.btn-copy:hover{background:var(--color-bg-code);border-color:var(--color-border-strong)}.btn-copy .copy-icon,.btn-copy .check-icon{width:16px;height:16px;color:var(--color-text-muted)}.btn-copy .check-icon{display:none;color:var(--color-success)}.btn-copy.copied .copy-icon{display:none}.btn-copy.copied .check-icon{display:block}.output-wrapper{flex:1;overflow:auto;background:var(--color-bg-code)}.output-content{margin:0;padding:16px 20px;font-family:var(--font-mono);font-size:13px;line-height:1.6;color:var(--color-text);white-space:pre-wrap;word-wrap:break-word}.output-content.error{color:var(--color-error);background:var(--color-error-bg)}.output-content.success{color:var(--color-text)}.output-content .placeholder{color:var(--color-text-subtle);font-style:italic}.loading-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#fafaf8f2;backdrop-filter:blur(4px);z-index:1000;transition:opacity var(--transition-normal)}.loading-overlay.hidden{opacity:0;pointer-events:none}.loading-content{display:flex;flex-direction:column;align-items:center;gap:16px;font-family:var(--font-mono);font-size:14px;color:var(--color-text-muted)}.loading-spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@media (max-width: 900px){#app{height:auto;min-height:100vh}.main{grid-template-columns:1fr;grid-template-rows:min-content min-content;overflow:visible;flex:none}.panel{overflow:visible}.panel-input{padding:16px;gap:12px;overflow-y:visible}.panel-output{min-height:200px}.header{flex-direction:column;height:auto;padding:12px 16px;gap:12px}.header-controls{width:100%}.sample-select-label,.sample-select{flex:1}.action-bar{flex-wrap:wrap}.btn{flex:1;min-width:120px}.dto-group,.dto-group .btn{flex:1}}@media (max-width: 480px){.header-brand{gap:8px}.header-title{font-size:16px}.header-badge{display:none}.editor-wrapper{min-height:100px}.line-numbers{min-width:32px;font-size:12px}.editor-textarea{font-size:12px}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.panel{animation:fadeIn .4s ease backwards}.panel-input{animation-delay:.1s}.panel-output{animation-delay:.2s}