:root{--bg: #f4f5f8;--surface: #ffffff;--surface-muted: #f8fafc;--surface-sunken: #f1f3f8;--border: #e5e7eb;--border-strong: #d1d5db;--text: #0f172a;--text-muted: #64748b;--text-subtle: #94a3b8;--primary: #4f46e5;--primary-hover: #4338ca;--primary-soft: rgba(79, 70, 229, .12);--primary-ring: rgba(79, 70, 229, .25);--selection-bg: rgba(79, 70, 229, .3);--danger-bg: #fef2f2;--danger-border: #fecaca;--danger-text: #b91c1c;--warning: #d97706;--warning-hover: #b45309;--warning-soft: rgba(217, 119, 6, .14);--radius-sm: 6px;--radius: 8px;--radius-lg: 12px;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);--shadow-sm: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-md: 0 4px 12px rgba(15, 23, 42, .06), 0 2px 4px rgba(15, 23, 42, .04);--shadow-lg: 0 12px 32px rgba(15, 23, 42, .08), 0 4px 8px rgba(15, 23, 42, .04);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", ui-monospace, monospace;--syn-keyword: #7c3aed;--syn-type: #0891b2;--syn-variable: #0f172a;--syn-string: #b91c1c;--syn-number: #047857;--syn-comment: #94a3b8;--syn-operator: #64748b;--syn-punctuation: #475569;--syn-property: #b45309;--syn-atom: #2563eb}[data-theme=dark]{--bg: #0b0f17;--surface: #111827;--surface-muted: #1a2230;--surface-sunken: #0d1320;--border: #253143;--border-strong: #344257;--text: #e5e7eb;--text-muted: #9ca3af;--text-subtle: #6b7280;--primary: #818cf8;--primary-hover: #a5b4fc;--primary-soft: rgba(129, 140, 248, .18);--primary-ring: rgba(129, 140, 248, .4);--selection-bg: rgba(129, 140, 248, .42);--danger-bg: rgba(220, 38, 38, .12);--danger-border: rgba(248, 113, 113, .38);--danger-text: #fca5a5;--warning: #fbbf24;--warning-hover: #fcd34d;--warning-soft: rgba(251, 191, 36, .18);--shadow-xs: 0 1px 2px rgba(0, 0, 0, .4);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .45), 0 1px 2px rgba(0, 0, 0, .35);--shadow-md: 0 4px 12px rgba(0, 0, 0, .5), 0 2px 4px rgba(0, 0, 0, .3);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .6), 0 4px 8px rgba(0, 0, 0, .35);--syn-keyword: #c4b5fd;--syn-type: #67e8f9;--syn-variable: #e5e7eb;--syn-string: #fca5a5;--syn-number: #86efac;--syn-comment: #64748b;--syn-operator: #9ca3af;--syn-punctuation: #cbd5e1;--syn-property: #fde68a;--syn-atom: #93c5fd}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%}body{font-family:var(--font-sans);font-feature-settings:"cv11","ss01";background:var(--bg);color:var(--text);height:100vh;overflow:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}.cm-editor,.cm-editor *,.shortcut,.data-textarea,.data-url-input,.data-entry code,.result-query,.sql-block,.sql-block *,.sql-block-label code,.error-box,.step-counter{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0}#app{height:100vh;display:flex;flex-direction:column}.playground{display:flex;flex-direction:column;height:100vh;background:var(--bg)}.playground-body{display:grid;grid-template-columns:1fr 1fr;flex:1;min-height:0;gap:12px;padding:12px}.editor-side,.output-side{display:flex;flex-direction:column;min-height:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.output-side{overflow-y:auto;padding:16px 18px}.toolbar{display:flex;justify-content:space-between;align-items:center;padding:10px 18px;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow-xs);flex-shrink:0;z-index:2}.toolbar-left{display:flex;align-items:center;gap:14px}.toolbar-right{display:flex;align-items:center;gap:8px}.toolbar-logo{height:32px;width:32px;border-radius:8px;object-fit:cover;box-shadow:var(--shadow-sm)}.toolbar-title{font-weight:600;font-size:15px;letter-spacing:-.01em;color:var(--text);text-decoration:none;cursor:pointer;transition:color .15s ease}.toolbar-title:hover{color:var(--primary)}.toolbar-title:after{content:"";display:inline-block;width:1px;height:16px;background:var(--border);margin:0 4px 0 10px;vertical-align:-3px}.example-select,.backend-select{font-family:inherit;font-size:13px;padding:6px 28px 6px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;color:var(--text);cursor:pointer;-moz-appearance:none;appearance:none;-webkit-appearance:none;transition:border-color .15s ease,box-shadow .15s ease}[data-theme=dark] .example-select,[data-theme=dark] .backend-select{background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%239ca3af' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}.example-select:hover,.backend-select:hover{border-color:var(--border-strong)}.example-select:focus,.backend-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.example-select{max-width:360px}.btn{font-family:inherit;font-size:13px;padding:7px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-weight:500;line-height:1.2;text-decoration:none;display:inline-flex;align-items:center;gap:6px;transition:background .15s ease,border-color .15s ease,box-shadow .15s ease,transform .05s ease}.btn:disabled{opacity:.55;cursor:not-allowed}.btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--primary-ring)}.btn-primary{background:linear-gradient(180deg,#5b52ea,#4f46e5);color:#fff;border-color:#4338ca;box-shadow:0 1px #ffffff2e inset,0 1px 2px #0f172a26}.btn-primary:hover:not(:disabled){background:linear-gradient(180deg,#4f46e5,#4338ca)}.btn-primary:active:not(:disabled){transform:translateY(.5px)}.btn-secondary{background:var(--surface);color:var(--text);box-shadow:var(--shadow-xs)}.btn-secondary:hover:not(:disabled){background:var(--surface-muted);border-color:var(--border-strong)}.btn-icon{padding:7px 9px;color:var(--text-muted)}.btn-icon:hover:not(:disabled){color:var(--text)}.btn-icon svg{display:block}.btn-warnings-toggle[aria-pressed=true]{color:var(--warning)}.btn-warnings-toggle[aria-pressed=true]:hover:not(:disabled){color:var(--warning-hover)}.btn-warnings-toggle[aria-pressed=false]{color:var(--text-subtle);opacity:.6}.btn-warnings-toggle[aria-pressed=false]:hover:not(:disabled){color:var(--text-muted);opacity:1}.shortcut{font-size:11px;font-family:var(--font-mono);padding:1px 5px;margin-left:2px;border-radius:3px;background:#ffffff2e;color:#ffffffe6;letter-spacing:.02em}.editor-container{flex:1;min-height:0;overflow:hidden}.editor-container .cm-editor{height:100%;font-size:14px}.editor-container .cm-scroller{font-family:var(--font-mono);line-height:1.6}.editor-container .cm-editor.cm-focused{outline:none}.cm-editor .tok-keyword{color:var(--syn-keyword);font-weight:600}.cm-editor .tok-typeName{color:var(--syn-type)}.cm-editor .tok-variableName{color:var(--syn-variable)}.cm-editor .tok-string,.cm-editor .tok-string2{color:var(--syn-string)}.cm-editor .tok-number{color:var(--syn-number)}.cm-editor .tok-comment,.cm-editor .tok-lineComment,.cm-editor .tok-blockComment{color:var(--syn-comment);font-style:italic}.cm-editor .tok-operator{color:var(--syn-operator)}.cm-editor .tok-punctuation,.cm-editor .tok-bracket,.cm-editor .tok-paren,.cm-editor .tok-brace,.cm-editor .tok-squareBracket,.cm-editor .tok-angleBracket,.cm-editor .tok-separator{color:var(--syn-punctuation)}.cm-editor .tok-propertyName{color:var(--syn-property)}.cm-editor .tok-atom,.cm-editor .tok-bool,.cm-editor .tok-null,.cm-editor .tok-function,.cm-editor .tok-labelName{color:var(--syn-atom)}.data-panel{border-top:1px solid var(--border);background:var(--surface-muted);flex-shrink:0;max-height:40%;overflow-y:auto;padding:12px 16px}.data-entry{margin-bottom:12px}.data-entry:last-child{margin-bottom:2px}.data-entry-header{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:4px}.data-entry label{min-width:0;flex:1;font-size:12px;color:var(--text-muted)}.data-format-select{flex:0 0 auto;font-family:inherit;font-size:11px;padding:2px 22px 2px 8px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 6px center;color:var(--text);cursor:pointer;-moz-appearance:none;appearance:none;-webkit-appearance:none}[data-theme=dark] .data-format-select{background-image:url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6' fill='none'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%239ca3af' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}.data-format-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.data-entry code{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;white-space:nowrap;font-family:var(--font-mono);font-size:12px;line-height:1.45;background:var(--surface);color:var(--text);padding:3px 6px 10px;border:1px solid var(--border);border-radius:4px;scrollbar-width:thin}.data-entry code::-webkit-scrollbar{height:6px}.data-entry code::-webkit-scrollbar-track{background:transparent}.data-entry code::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:999px}.data-textarea,.data-url-input{width:100%;font-family:var(--font-mono);font-size:12px;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);resize:vertical;line-height:1.55;background:var(--surface);color:var(--text);transition:border-color .15s ease,box-shadow .15s ease}.data-textarea{height:100px}.data-url-input{height:36px}.data-url-row{display:flex;align-items:stretch;gap:6px}.data-url-row .data-url-input{width:auto;min-width:0;flex:1}.data-url-open-button{display:inline-flex;width:36px;height:36px;flex:0 0 36px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--primary);cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease,box-shadow .15s ease}.data-url-open-button:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft);color:var(--primary-hover)}.data-url-open-button:focus-visible{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.data-url-open-button:disabled{color:var(--text-subtle);cursor:not-allowed;opacity:.7}.data-textarea::placeholder{color:var(--text-subtle)}.data-url-input::placeholder{color:var(--text-subtle)}.data-textarea:focus,.data-url-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.results-panel{display:flex;flex-direction:column;gap:16px}.result-block{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--surface);box-shadow:var(--shadow-xs)}.result-header{display:flex;align-items:center;background:var(--surface-muted);border-bottom:1px solid var(--border);gap:12px;padding:6px 10px 6px 14px}.result-query{font-family:var(--font-mono);font-size:12px;color:var(--text-muted);white-space:pre-wrap;word-break:break-word;flex:1;min-width:0;line-height:1.5}.segmented,.format-toggle{display:inline-flex;align-items:stretch;padding:2px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-xs)}.segmented button,.format-toggle-btn{font-family:inherit;font-size:11px;font-weight:500;padding:3px 10px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;border-radius:4px;line-height:1.4;text-transform:none;letter-spacing:0;transition:background .15s ease,color .15s ease}.segmented button.active,.format-toggle-btn.active{background:var(--primary);color:#fff}.segmented button:disabled,.format-toggle-btn:disabled{opacity:.4;cursor:not-allowed}.segmented button:hover:not(:disabled):not(.active),.format-toggle-btn:hover:not(:disabled):not(.active){background:var(--surface-muted);color:var(--text)}.mermaid-view{padding:14px;background:var(--surface);overflow:auto}.mermaid-container{display:flex;justify-content:center}.mermaid-container svg{max-width:100%;height:auto}.result-json{margin:0;padding:14px;font-family:var(--font-mono);font-size:12px;background:var(--surface);color:var(--text);overflow:auto;max-height:400px;line-height:1.55}.result-empty,.result-yes{padding:14px;font-size:13px;font-family:var(--font-mono, ui-monospace, monospace)}.result-empty{color:var(--text-subtle)}.result-yes{color:var(--text)}.result-table{width:100%;border-collapse:collapse;font-size:13px}.result-table thead{position:sticky;top:0;z-index:1}.result-table th{text-align:left;padding:9px 14px;background:var(--surface-muted);border-bottom:1px solid var(--border);font-weight:600;font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}.result-table td{padding:7px 14px;border-bottom:1px solid var(--border);font-family:var(--font-mono);font-size:12.5px;color:var(--text)}.result-table tbody tr{transition:background .1s ease}.result-table tbody tr:nth-child(2n){background:var(--surface-muted)}.result-table tbody tr:hover{background:var(--primary-soft)}.result-table tr:last-child td{border-bottom:none}.sql-preview{display:flex;flex-direction:column;gap:18px}.sql-block{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:8px;background:var(--surface-muted)}.sql-block-wrapper{border-radius:var(--radius);transition:box-shadow .15s ease,outline-color .15s ease;outline:2px solid transparent;outline-offset:1px;margin-bottom:10px}.sql-block-wrapper.highlighted{outline-color:var(--primary);box-shadow:0 0 0 4px var(--primary-ring)}.sql-block-wrapper .sql-block{margin-bottom:0}.sql-block-label{display:inline-block;font-size:11px;color:var(--text-muted);padding:2px 0 6px}.sql-block-label code{font-family:var(--font-mono);font-size:11.5px;color:var(--text);font-weight:600}.error-box{font-family:var(--font-mono);font-size:13px;padding:12px 14px;background:var(--danger-bg);border:1px solid var(--danger-border);border-radius:var(--radius);color:var(--danger-text);white-space:pre-wrap;word-break:break-word;line-height:1.55;margin-bottom:16px;box-shadow:var(--shadow-xs)}.placeholder{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-subtle);font-size:14px;letter-spacing:-.005em}dialog.cycle-modal{padding:0;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:min(720px,calc(100vw - 48px));max-height:90vh;display:flex;flex-direction:column;overflow:hidden}dialog.cycle-modal:not([open]){display:none}dialog.cycle-modal::backdrop{background:#0f172a80}.cycle-modal-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--surface-muted)}.cycle-modal-title{font-weight:600;font-size:14px;color:var(--text)}.cycle-modal-close{background:transparent;border:none;font-size:22px;line-height:1;color:var(--text-muted);cursor:pointer;padding:0 6px;border-radius:4px;transition:background .15s ease,color .15s ease}.cycle-modal-close:hover{background:var(--surface-sunken);color:var(--text)}.cycle-modal-close:focus-visible{outline:none;box-shadow:0 0 0 3px var(--primary-ring)}.cycle-modal-body{padding:18px;overflow:auto;flex:1;min-height:0}.cycle-modal-diagram{display:flex;justify-content:center}.cycle-modal-diagram svg{max-width:100%;height:auto}.cycle-modal-legend{display:flex;gap:18px;padding:10px 16px;border-top:1px solid var(--border);background:var(--surface-muted);font-size:12px;color:var(--text-muted)}.cycle-legend-item{display:inline-flex;align-items:center;gap:6px}.cycle-legend-swatch{display:inline-block;width:18px;height:2.5px;border-radius:1px}.cycle-legend-swatch-grow{background:var(--warning)}.cycle-legend-swatch-flow{background:var(--text-subtle)}.cycle-legend-swatch-neg{background:var(--danger-text)}.cycle-legend-swatch-pos{background:var(--text-subtle)}.mascot-drive{position:relative;width:100%;height:100%;overflow:hidden}.mascot-img{position:absolute;height:180px;width:180px;object-fit:cover;border-radius:12px;top:50%;transform:translateY(-50%);box-shadow:var(--shadow-md);animation:drive 2s linear infinite,bounce .3s ease-in-out infinite}@keyframes drive{0%{left:-200px}to{left:calc(100% + 20px)}}@keyframes bounce{0%,to{margin-top:0}50%{margin-top:-6px}}.output-side::-webkit-scrollbar,.data-panel::-webkit-scrollbar,.result-json::-webkit-scrollbar,.mermaid-view::-webkit-scrollbar{width:10px;height:10px}.output-side::-webkit-scrollbar-track,.data-panel::-webkit-scrollbar-track,.result-json::-webkit-scrollbar-track,.mermaid-view::-webkit-scrollbar-track{background:transparent}.output-side::-webkit-scrollbar-thumb,.data-panel::-webkit-scrollbar-thumb,.result-json::-webkit-scrollbar-thumb,.mermaid-view::-webkit-scrollbar-thumb{background:var(--border);border-radius:5px;border:2px solid var(--surface)}.output-side::-webkit-scrollbar-thumb:hover,.data-panel::-webkit-scrollbar-thumb:hover,.result-json::-webkit-scrollbar-thumb:hover,.mermaid-view::-webkit-scrollbar-thumb:hover{background:var(--border-strong)}.tabbed-results{display:flex;flex-direction:column;gap:10px;flex:1;min-height:0}.tabs{display:flex;gap:2px;border-bottom:1px solid var(--border)}.tab{padding:6px 14px;background:transparent;border:1px solid transparent;border-bottom:none;border-radius:var(--radius-sm) var(--radius-sm) 0 0;font-size:13px;font-weight:500;color:var(--text-muted);cursor:pointer;margin-bottom:-1px}.tab:hover{color:var(--text);background:var(--surface-muted)}.tab.active{color:var(--text);background:var(--surface);border-color:var(--border);border-bottom-color:var(--surface);font-weight:600}.tab-panel{flex:1;min-height:0;display:flex;flex-direction:column}.tab-placeholder{padding:24px;font-size:13px;color:var(--text-muted);text-align:center}.step-panel{display:flex;flex-direction:column;gap:10px}.step-panel .stratum-box,.step-panel .relation-table,.step-panel tr.added{scroll-margin-top:140px;scroll-margin-bottom:16px}.step-sticky-header{position:sticky;top:0;z-index:2;display:flex;flex-direction:column;gap:8px;padding-bottom:6px;background:var(--bg)}.step-controls{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding:8px 10px;background:var(--surface-muted);border:1px solid var(--border);border-radius:var(--radius)}.step-nav-group{display:inline-flex;align-items:center;gap:10px}.step-nav{display:inline-flex;align-items:center;padding:2px;background:var(--surface);border:1px solid var(--border);border-radius:999px;box-shadow:0 1px 2px #0000000a}.step-nav button{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;padding:0;background:transparent;border:none;border-radius:999px;color:var(--text-muted);cursor:pointer;transition:background .12s ease,color .12s ease}.step-nav button:hover:not(:disabled){background:var(--primary-soft);color:var(--primary)}.step-nav button:focus-visible{outline:2px solid var(--primary-ring);outline-offset:1px}.step-nav .step-play{width:30px;height:30px;margin:0 2px;background:var(--primary);color:#fff}.step-nav .step-play:hover:not(:disabled){background:var(--primary-hover);color:#fff}.step-nav button:disabled{opacity:.35;cursor:not-allowed}.step-counter{font-family:var(--font-mono);font-size:12px;color:var(--text-muted)}.step-options{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.step-option{display:inline-flex;align-items:center;gap:6px}.step-option-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}.step-caption{padding:8px 12px;font-size:13px;color:var(--text);background:var(--primary-soft);border-left:3px solid var(--primary);border-radius:0 var(--radius-sm) var(--radius-sm) 0}.step-tree{display:flex;flex-wrap:nowrap;overflow-x:auto;gap:4px;padding:6px;background:var(--surface-sunken);border-radius:var(--radius-sm)}.step-tree-item{flex-shrink:0;padding:3px 8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:11px;color:var(--text-muted);cursor:pointer;white-space:nowrap}.step-tree-item:hover{background:var(--primary-soft);border-color:var(--primary)}.step-tree-item.current{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.step-snapshot{display:flex;flex-direction:column;gap:10px}.stratum-box{padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.stratum-box.current{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-ring)}.stratum-box.extensional{background:var(--surface-sunken)}.stratum-header{width:100%;font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;display:flex;align-items:center;gap:8px;background:transparent;border:none;padding:0;text-align:left;font-family:inherit}button.stratum-header{cursor:pointer}button.stratum-header:hover{color:var(--text)}.stratum-chevron{display:inline-flex;align-items:center;justify-content:center;width:12px;height:12px;color:var(--text-subtle);transition:transform .15s ease}.stratum-chevron svg{display:block}.stratum-box.collapsed .stratum-chevron{transform:rotate(-90deg)}.stratum-summary{text-transform:none;letter-spacing:0;font-weight:400;color:var(--text-subtle)}.stratum-box.collapsed .stratum-header{margin-bottom:0}.stratum-tag{font-size:10px;font-weight:600;padding:2px 7px;background:var(--primary-soft);color:var(--primary);border-radius:999px;text-transform:uppercase;letter-spacing:.04em;line-height:1.4}.relation-table{margin-bottom:12px;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--surface)}.relation-table:last-child{margin-bottom:0}.relation-name{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 10px;background:var(--surface-muted);border-bottom:1px solid var(--border);font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--text)}.relation-size{color:var(--text-subtle);font-weight:400;margin-left:2px}.relation-empty{padding:10px 12px;font-family:var(--font-mono);font-size:12px;color:var(--text-subtle)}.relation-table table{width:100%;border-collapse:collapse;font-family:var(--font-mono);font-size:12px}.relation-table thead th{text-align:left;padding:6px 10px;background:var(--surface-muted);border-bottom:1px solid var(--border);font-weight:600;font-size:10.5px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em}.relation-table tbody td{padding:4px 10px;border-bottom:1px solid var(--border);color:var(--text)}.relation-table tbody tr:last-child td{border-bottom:none}.relation-table tbody tr:nth-child(2n){background:var(--surface-muted)}.relation-table tbody tr.added td{background:var(--primary-soft);font-weight:600;animation:step-added-fade .6s ease-out}@keyframes step-added-fade{0%{background:var(--primary);color:#fff}to{background:var(--primary-soft);color:var(--text)}}.step-queries{margin-top:8px;padding-top:8px;border-top:1px solid var(--border)}.section-title,.step-section-title,.sql-section-title,.data-panel-header{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}@media(max-width:768px){.playground-body{grid-template-columns:1fr;grid-template-rows:1fr 1fr;gap:8px;padding:8px}.toolbar{padding:8px 12px}.toolbar-left{gap:10px}.toolbar-title:after{display:none}.example-select{max-width:180px}.shortcut{display:none}}