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var(--fsp-border);border-radius:var(--radius-md);background:transparent;color:var(--color-text-secondary);cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}.font-settings__trigger:hover,.font-settings__trigger--active{background:var(--fsp-bg-subtle);border-color:var(--color-border-hover);color:var(--fsp-text)}.font-settings__trigger--active{border-color:var(--fsp-accent);color:var(--fsp-accent)}.font-settings__trigger-glyph{font-weight:600;font-size:14px;line-height:1}.font-settings__trigger-glyph sup{font-size:10px}.font-settings__dot{position:absolute;top:4px;right:4px;width:6px;height:6px;border-radius:50%;background:var(--fsp-accent)}.font-settings__panel{position:fixed;display:block;z-index:10000;width:272px;overflow-y:auto;padding:12px 14px 10px;border:1px solid var(--fsp-border);border-radius:12px;background:var(--fsp-bg);color:var(--fsp-text);box-shadow:var(--fsp-shadow);text-align:left;font-size:12.5px;line-height:1.4;animation:fs-pop .14s 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.12s ease}.font-settings__preset:hover{color:var(--fsp-text)}.font-settings__preset--active{background:var(--fsp-bg);color:var(--fsp-text);box-shadow:var(--shadow-sm),0 0 0 1px var(--fsp-border)}.font-settings__sections{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}.font-settings__row{display:grid;grid-template-columns:82px 1fr 38px;align-items:center;gap:10px;min-height:26px}.font-settings__label{font-size:12px;font-weight:500;line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:default}.font-settings__value{text-align:right;font-size:11px;font-variant-numeric:tabular-nums;color:var(--fsp-text-muted)}.font-settings__slider{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:16px;margin:0;background:transparent;cursor:pointer}.font-settings__slider:focus-visible{outline:none}.font-settings__slider::-webkit-slider-runnable-track{height:3px;border-radius:999px;background:linear-gradient(to right,var(--fsp-accent) var(--fill, 0%),var(--fsp-border) var(--fill, 0%))}.font-settings__slider::-webkit-slider-thumb{-webkit-appearance:none;width:13px;height:13px;margin-top:-5px;border-radius:50%;border:2px solid var(--fsp-bg);background:var(--fsp-accent);box-shadow:0 0 0 1px var(--fsp-accent);transition:transform .12s ease}.font-settings__slider:hover::-webkit-slider-thumb,.font-settings__slider:focus-visible::-webkit-slider-thumb{transform:scale(1.15)}.font-settings__slider::-moz-range-track{height:3px;border-radius:999px;background:var(--fsp-border)}.font-settings__slider::-moz-range-progress{height:3px;border-radius:999px;background:var(--fsp-accent)}.font-settings__slider::-moz-range-thumb{width:9px;height:9px;border-radius:50%;border:2px solid var(--fsp-bg);background:var(--fsp-accent);box-shadow:0 0 0 1px var(--fsp-accent)}.font-settings__footnote{margin:10px 0 0;padding-top:8px;border-top:1px solid var(--fsp-border);color:var(--fsp-text-muted);font-size:10.5px}@media(max-width:480px){.font-settings__panel{width:min(272px,calc(100vw - 24px))}}.sidebar-rail{flex:0 0 18px;align-self:stretch;display:flex;align-items:center;justify-content:center;padding:0;border:none;border-right:1px solid var(--color-border);background:var(--color-bg-primary);color:var(--color-text-muted);cursor:pointer;transition:background var(--transition-fast),color var(--transition-fast);z-index:2}.sidebar-rail:hover{background:var(--color-orange-muted);color:var(--color-orange-primary)}.sidebar-rail__chevron{display:flex;align-items:center;justify-content:center;width:14px;height:14px;transition:transform var(--transition-base)}.sidebar-rail__chevron svg{width:100%;height:100%}.sidebar-rail--collapsed .sidebar-rail__chevron{transform:rotate(180deg)}@media(max-width:968px){.lab .sidebar-rail{display:none}}@media(max-width:768px){.sql-lab .sidebar-rail{display:none}}.sidebar__inner{width:var(--sidebar-width, 320px);height:100%;display:flex;flex-direction:column;overflow:hidden}.sql-lab{--sql-header-height: 52px;font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary)}.sql-lab code,.sql-lab pre{font-family:var(--font-mono)}.sql-lab .anim-stage{border:1px solid var(--border-color);border-radius:14px;background:var(--bg-secondary);outline:none}.sql-lab .anim-stage:focus-visible{border-color:var(--orange-primary);box-shadow:var(--focus-ring)}.sql-lab .anim-stage__canvas{min-height:300px;padding:26px 22px;overflow-x:auto;background-image:linear-gradient(var(--color-hairline) 1px,transparent 1px),linear-gradient(90deg,var(--color-hairline) 1px,transparent 1px);background-size:22px 22px}.sql-lab .anim-stage__footer{border-top:1px solid var(--border-color);padding:16px 20px 18px}.sql-lab .anim-stage__caption-slot{min-height:48px}.sql-lab .anim-stage__caption{margin:0;font-size:calc(14px * var(--fs-scale, 1));line-height:1.6;color:var(--text-secondary)}.sql-lab .anim-stage code{padding:1px 6px;border-radius:5px;border:1px solid var(--border-color);background:var(--bg-tertiary);font-size:calc(12.5px * var(--fs-scale, 1));color:var(--text-primary)}.sql-lab .anim-stage__caption code{color:var(--orange-primary)}.sql-lab .anim-stage__caption strong{font-weight:600;color:var(--text-primary)}.sql-lab .anim-stage__controls{display:flex;align-items:center;gap:14px;margin-top:16px}.sql-lab .anim-stage__play{display:grid;place-items:center;flex-shrink:0;width:36px;height:36px;border:none;border-radius:50%;background:var(--orange-primary);color:#111010;cursor:pointer;transition:background-color .15s ease,transform .15s ease}.sql-lab .anim-stage__play:hover{background:var(--orange-hover);transform:scale(1.05)}.sql-lab .anim-stage__track{display:flex;flex:1;min-width:0;align-items:flex-start;gap:6px}.sql-lab .anim-stage__seg{flex:1;min-width:0;padding:4px 0 2px;border:none;background:none;text-align:left;cursor:pointer}.sql-lab .anim-stage__seg-bar{display:block;height:3px;border-radius:999px;background:var(--border-medium);transition:background-color .15s ease}.sql-lab .anim-stage__seg.is-past .anim-stage__seg-bar{background:var(--orange-border)}.sql-lab .anim-stage__seg.is-current .anim-stage__seg-bar{background:var(--orange-primary)}.sql-lab .anim-stage__seg:hover .anim-stage__seg-bar{background:var(--text-tertiary)}.sql-lab .anim-stage__seg.is-past:hover .anim-stage__seg-bar,.sql-lab .anim-stage__seg.is-current:hover .anim-stage__seg-bar{background:var(--orange-hover)}.sql-lab .anim-stage__seg-label{display:block;margin-top:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:calc(11px * var(--fs-scale, 1));font-weight:500;color:var(--text-tertiary);transition:color .15s ease}.sql-lab .anim-stage__seg.is-current .anim-stage__seg-label{color:var(--text-primary)}.sql-lab .anim-stage__steppers{display:flex;flex-shrink:0;gap:4px}.sql-lab .anim-stage__stepper{display:grid;place-items:center;width:32px;height:32px;border:1px solid var(--border-color);border-radius:8px;background:transparent;color:var(--text-secondary);cursor:pointer;transition:border-color .15s ease,color .15s ease,background-color .15s ease}.sql-lab .anim-stage__stepper:hover:not(:disabled){border-color:var(--border-medium);background:var(--bg-tertiary);color:var(--text-primary)}.sql-lab .anim-stage__stepper:disabled{opacity:.3;cursor:default}@media(max-width:768px){.sql-lab .anim-stage__canvas{padding:18px 14px}.sql-lab .anim-stage__seg-label{display:none}}@media(prefers-reduced-motion:reduce){.sql-lab .anim-stage *{animation-duration:.01ms!important;transition-duration:.01ms!important}}.sql-lab .tgrid{display:inline-flex;flex-direction:column;align-items:flex-start;gap:6px;min-width:0}.sql-lab .tgrid__caption{font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1));color:var(--orange-primary);white-space:nowrap}.sql-lab .tgrid__frame{display:flex;flex-direction:column;border:1px solid var(--border-color);border-radius:10px;background:var(--bg-primary);overflow:hidden}.sql-lab .tgrid__head{display:flex;border-bottom:1px solid var(--border-color);background:var(--bg-tertiary)}.sql-lab .tgrid__row{display:flex;border-bottom:1px solid var(--color-hairline)}.sql-lab .tgrid__row:last-child{border-bottom:none}.sql-lab .tgrid__cell{flex-shrink:0;box-sizing:border-box;padding:6px 8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-family:var(--font-mono);font-size:calc(12px * var(--fs-scale, 1));line-height:1.5;color:var(--text-primary);border-right:1px solid var(--color-hairline)}.sql-lab .tgrid__cell:last-child{border-right:none}.sql-lab .tgrid__cell.is-num{text-align:right}.sql-lab .tgrid__cell.is-null{color:var(--tone-null);font-style:italic}.sql-lab .tgrid__cell--head{font-weight:600;font-size:calc(11px * var(--fs-scale, 1));letter-spacing:.03em;text-transform:uppercase;color:var(--text-secondary)}.sql-lab .tgrid__cell--extra{border-left:1px dashed var(--border-medium);font-style:normal}.sql-lab .tgrid__empty{padding:14px 12px;font-size:calc(12px * var(--fs-scale, 1));color:var(--text-tertiary);font-style:italic}.sql-lab .tgrid__note{font-size:calc(11px * var(--fs-scale, 1));color:var(--text-tertiary)}.sql-lab .anim-row{display:flex;flex-wrap:wrap;align-items:flex-start;gap:28px}.sql-lab .anim-notes{display:flex;flex-direction:column;gap:10px;width:250px;min-width:0}.sql-lab .anim-note{border:1px solid;border-radius:10px;padding:10px 12px}.sql-lab .anim-note__title{font-size:calc(12px * var(--fs-scale, 1));font-weight:600}.sql-lab .anim-note__body{margin-top:4px;font-size:calc(11.5px * var(--fs-scale, 1));line-height:1.55;color:var(--text-secondary)}.sql-lab .anim-note__body code{font-size:calc(11px * var(--fs-scale, 1))}.sql-lab .anim-note--focus{border-color:color-mix(in oklab,var(--tone-focus) 35%,transparent);background:color-mix(in oklab,var(--tone-focus) 7%,transparent)}.sql-lab .anim-note--focus .anim-note__title{color:var(--tone-focus)}.sql-lab .anim-note--keep{border-color:color-mix(in oklab,var(--tone-keep) 35%,transparent);background:color-mix(in oklab,var(--tone-keep) 7%,transparent)}.sql-lab .anim-note--keep .anim-note__title{color:var(--tone-keep)}.sql-lab .anim-note--drop{border-color:color-mix(in oklab,var(--tone-drop) 35%,transparent);background:color-mix(in oklab,var(--tone-drop) 7%,transparent)}.sql-lab .anim-note--drop .anim-note__title{color:var(--tone-drop)}.sql-lab .anim-note--nullish{border-color:color-mix(in oklab,var(--tone-null) 35%,transparent);background:color-mix(in oklab,var(--tone-null) 7%,transparent)}.sql-lab .anim-note--nullish .anim-note__title{color:var(--tone-null)}.sql-lab .anim-note--idle,.sql-lab .anim-note--muted{border-color:var(--border-color);background:var(--color-overlay)}.sql-lab .anim-note--idle .anim-note__title,.sql-lab .anim-note--muted .anim-note__title{color:var(--text-secondary)}.sql-lab .anim-verdict{border:1px solid var(--border-color);border-radius:10px;padding:10px 12px;background:var(--bg-primary);font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1));line-height:1.7}.sql-lab .anim-verdict__bad{color:var(--tone-drop)}.sql-lab .anim-verdict__good{color:var(--tone-keep)}@media(max-width:900px){.sql-lab .anim-notes{width:100%}}.sql-lab .anim-col{display:flex;flex-direction:column;gap:18px}.sql-lab .anim-result{display:flex;flex-direction:column;gap:8px}.sql-lab .anim-result__arrow{font-size:calc(16px * var(--fs-scale, 1));color:var(--orange-primary);line-height:1}.sql-lab .qo{display:flex;flex-direction:column;gap:4px;min-width:300px;padding:14px;border:1px solid var(--border-color);border-radius:10px;background:var(--bg-primary)}.sql-lab .qo__line{display:flex;align-items:center;gap:10px;padding:5px 8px;border-radius:6px;opacity:.4;transition:opacity .22s ease,background-color .22s ease}.sql-lab .qo__line.is-done{opacity:.75}.sql-lab .qo__line.is-active{opacity:1;background:var(--orange-subtle);box-shadow:inset 0 0 0 1px var(--orange-border)}.sql-lab .qo__line code{background:none;border:none;padding:0;font-size:calc(12px * var(--fs-scale, 1));white-space:pre}.sql-lab .qo__badge{display:grid;place-items:center;flex-shrink:0;width:20px;height:20px;border-radius:50%;background:var(--bg-tertiary);border:1px solid var(--border-color);font-family:var(--font-mono);font-size:calc(11px * var(--fs-scale, 1));font-weight:600;color:var(--orange-primary)}.sql-lab .qo__line.is-active .qo__badge{background:var(--orange-primary);border-color:var(--orange-primary);color:#111010}.sql-lab .qo__verdict{margin-top:10px}@media(max-width:900px){.sql-lab .qo{min-width:0;width:100%}}.sql-lab .sidebar{position:relative;background:var(--bg-secondary);color:var(--text-primary);display:flex;flex-direction:column;overflow:hidden;border-right:1px solid var(--border-color)}.sql-lab .sidebar-header{position:relative;padding:16px 16px 12px;border-bottom:1px solid var(--border-color)}.sql-lab .sidebar-header h2{margin:0 0 2px;font-size:calc(14px * var(--fs-scale, 1));font-weight:600;color:var(--text-primary)}.sql-lab .sidebar-header p{margin:0;font-size:calc(11px * var(--fs-scale, 1));color:var(--text-tertiary);line-height:1.4}.sql-lab .lessons-container{flex:1;overflow-y:auto;padding:8px 0 16px}.sql-lab .chapter{margin-bottom:6px}.sql-lab .chapter-title{display:flex;align-items:center;gap:8px;padding:10px 16px 6px;margin:0;font-size:calc(11px * var(--fs-scale, 1));font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary);cursor:pointer;-webkit-user-select:none;user-select:none;transition:color .15s ease}.sql-lab .chapter-title:hover{color:var(--text-primary)}.sql-lab .chapter-chevron{display:inline-block;width:10px;font-size:calc(13px * var(--fs-scale, 1));line-height:1;color:var(--text-tertiary);transition:transform .15s ease}.sql-lab .chapter-chevron.expanded{transform:rotate(90deg)}.sql-lab .lessons-list{display:flex;flex-direction:column;gap:1px;padding:0 8px;overflow:hidden;animation:expandList .2s ease-out}@keyframes expandList{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.sql-lab .lesson-item{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:8px;cursor:pointer;transition:background-color .15s ease}.sql-lab .lesson-item:hover{background:var(--bg-tertiary)}.sql-lab .lesson-item.active{background:var(--orange-subtle)}.sql-lab .lesson-number{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:var(--bg-tertiary);border:1px solid var(--border-color);font-size:calc(11px * var(--fs-scale, 1));font-weight:600;font-variant-numeric:tabular-nums;flex-shrink:0;color:var(--text-secondary)}.sql-lab .lesson-item.active .lesson-number{background:var(--orange-primary);border-color:var(--orange-primary);color:#111010}.sql-lab .lesson-title{flex:1;min-width:0;font-size:calc(13px * var(--fs-scale, 1));line-height:1.35;color:var(--text-primary)}.sql-lab .lesson-item.active .lesson-title{font-weight:500}.sql-lab .difficulty-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;margin:0 8px 0 7px}.sql-lab .difficulty-dot.easy{background:var(--success)}.sql-lab .difficulty-dot.medium{background:var(--warning)}.sql-lab .difficulty-dot.hard{background:var(--error)}.sql-lab .lesson-anim-badge{margin-left:auto;flex-shrink:0;font-size:calc(8px * var(--fs-scale, 1));line-height:1;color:var(--orange-primary);opacity:.7}.sql-lab .lesson-item.active .lesson-anim-badge{opacity:1}.sql-lab .mobile-menu-button{display:none;position:fixed;bottom:16px;left:16px;z-index:1001;width:44px;height:44px;border-radius:999px;background:var(--color-bg-inverse);color:var(--color-text-inverse);border:none;cursor:pointer;align-items:center;justify-content:center;box-shadow:var(--shadow-lg)}.sql-lab .mobile-close-button{display:none;position:absolute;top:12px;right:12px;width:30px;height:30px;background:transparent;border:none;color:var(--text-secondary);cursor:pointer;align-items:center;justify-content:center;border-radius:6px}.sql-lab .mobile-close-button:hover{background:var(--bg-tertiary);color:var(--text-primary)}.sql-lab .mobile-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:var(--color-scrim);z-index:998}@media screen and (max-width:768px){.sql-lab .mobile-menu-button,.sql-lab .mobile-close-button{display:flex}.sql-lab .mobile-overlay{display:block}.sql-lab .sidebar{position:fixed;top:var(--navbar-height);left:0;bottom:0;width:85%!important;max-width:320px!important;min-width:0!important;z-index:999;transform:translate(-100%);transition:transform .25s ease-in-out;box-shadow:var(--shadow-lg)}.sql-lab .sidebar.mobile-open{transform:translate(0)}}.sql-lab .sidebar.sidebar-collapsible{--sidebar-width: 300px;transition:transform .25s ease,width .2s ease,min-width .2s ease,max-width .2s ease}@media screen and (min-width:769px){.sql-lab .sidebar.sidebar-collapsible.is-collapsed{--sidebar-current-width: 0px;border-right-width:0}}.sql-lab .query-editor{display:flex;flex-direction:column;height:100%;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;overflow:hidden}.sql-lab .editor-toolbar{display:flex;justify-content:space-between;align-items:center;gap:8px;height:40px;flex-shrink:0;padding:0 6px 0 16px;border-bottom:1px solid var(--border-color)}.sql-lab .toolbar-left{display:flex;align-items:center;gap:12px;min-width:0}.sql-lab .toolbar-title{font-size:calc(11px * var(--fs-scale, 1));font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.sql-lab .toolbar-right{display:flex;gap:8px}.sql-lab .run-button{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 10px 0 8px;border:none;border-radius:6px;background:var(--orange-primary);color:#111010;font-size:calc(12px * var(--fs-scale, 1));font-weight:600;letter-spacing:.01em;cursor:pointer;transition:background-color .15s ease,transform .15s ease}.sql-lab .run-button svg{width:12px;height:12px}.sql-lab .run-button:hover{background:var(--orange-hover)}.sql-lab .run-button:active{transform:translateY(1px)}.sql-lab .keyboard-hint{margin-left:2px;padding:1px 5px;border-radius:4px;background:#0000001f;font-family:var(--font-sans);font-size:calc(10.5px * var(--fs-scale, 1));font-weight:500;color:inherit;opacity:.8}.sql-lab .editor-wrapper{flex:1;min-height:0}@media screen and (max-width:768px){.sql-lab .editor-toolbar{padding:0 6px 0 12px}.sql-lab .run-button{height:32px}.sql-lab .keyboard-hint{display:none}}.sql-lab .schema-viewer{height:100%;display:flex;flex-direction:column;background:var(--bg-secondary);overflow:hidden}.sql-lab .schema-header{flex-shrink:0;padding:14px 20px;border-bottom:1px solid var(--border-color)}.sql-lab .schema-header h3{margin:0 0 2px;color:var(--text-primary);font-size:calc(14px * var(--fs-scale, 1));font-weight:600}.sql-lab .schema-subtitle{margin:0;color:var(--text-tertiary);font-size:calc(12px * var(--fs-scale, 1))}.sql-lab .schema-content{flex:1;overflow-y:auto;padding:16px}.sql-lab .tables-list{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}.sql-lab .table-card{border:1px solid var(--border-color);border-radius:10px;background:var(--bg-primary);overflow:hidden}.sql-lab .table-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;cursor:pointer;transition:background-color .15s ease}.sql-lab .table-header:hover{background:var(--bg-tertiary)}.sql-lab .table-info{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.sql-lab .table-name{margin:0;font-family:var(--font-mono);font-size:calc(13px * var(--fs-scale, 1));font-weight:600;color:var(--text-primary)}.sql-lab .table-description{margin:0;font-size:calc(12px * var(--fs-scale, 1));color:var(--text-secondary)}.sql-lab .row-count{font-size:calc(11px * var(--fs-scale, 1));color:var(--text-tertiary);font-variant-numeric:tabular-nums}.sql-lab .expand-icon{color:var(--text-tertiary);font-size:calc(10px * var(--fs-scale, 1));transition:transform .15s ease}.sql-lab .expand-icon.expanded{transform:rotate(180deg)}.sql-lab .table-details{border-top:1px solid var(--border-color);padding:14px}.sql-lab .columns-section h5{margin:0 0 8px;font-size:calc(10.5px * var(--fs-scale, 1));font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.sql-lab .columns-table{width:100%;border-collapse:separate;border-spacing:0;font-size:calc(12.5px * var(--fs-scale, 1));border:1px solid var(--border-color);border-radius:8px;overflow:hidden}.sql-lab .columns-table th{padding:7px 12px;text-align:left;background:var(--bg-tertiary);font-size:calc(10.5px * var(--fs-scale, 1));font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-secondary)}.sql-lab .columns-table td{padding:7px 12px;border-top:1px solid var(--color-hairline);vertical-align:top}.sql-lab .column-name{display:flex;align-items:center;gap:6px;font-family:var(--font-mono);font-weight:600;color:var(--text-primary)}.sql-lab .badge{display:inline-flex;align-items:center;height:16px;padding:0 5px;border-radius:4px;font-family:var(--font-sans);font-size:calc(9.5px * var(--fs-scale, 1));font-weight:700;letter-spacing:.04em}.sql-lab .badge.primary{background:var(--color-warning-bg);color:var(--warning);border:1px solid var(--color-warning-border)}.sql-lab .badge.foreign{background:var(--color-info-bg);color:var(--color-info);border:1px solid var(--color-info-border)}.sql-lab .column-type{color:var(--text-secondary);font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1))}.sql-lab .column-description{color:var(--text-secondary);font-size:calc(12px * var(--fs-scale, 1))}.sql-lab .sample-query-section{margin-top:12px;display:flex;justify-content:flex-end}.sql-lab .sample-query-button{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 12px;border:1px solid var(--border-color);border-radius:7px;background:var(--bg-secondary);color:var(--text-primary);font-size:calc(12px * var(--fs-scale, 1));font-weight:500;cursor:pointer;transition:border-color .15s ease,background-color .15s ease}.sql-lab .sample-query-button:hover{border-color:var(--orange-border);background:var(--orange-subtle);color:var(--orange-primary)}.sql-lab .relationships-section{margin-top:20px;padding:14px;border:1px solid var(--border-color);border-radius:10px;background:var(--bg-primary)}.sql-lab .relationships-section h4{margin:0 0 10px;font-size:calc(10.5px * var(--fs-scale, 1));font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--text-tertiary)}.sql-lab .relationships-list{display:flex;flex-direction:column;gap:8px}.sql-lab .relationship-item{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 12px;border-left:3px solid var(--orange-primary);border-radius:6px;background:var(--bg-secondary);font-size:calc(12.5px * var(--fs-scale, 1))}.sql-lab .rel-from,.sql-lab .rel-to{padding:1px 7px;border-radius:4px;border:1px solid var(--border-color);background:var(--bg-tertiary);font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1));font-weight:600;color:var(--text-primary)}.sql-lab .rel-arrow{color:var(--orange-primary);font-weight:600}.sql-lab .rel-type{color:var(--text-tertiary);font-style:italic;font-size:calc(11.5px * var(--fs-scale, 1))}.sql-lab .rel-description{width:100%;margin:2px 0 0;color:var(--text-secondary);font-size:calc(12px * var(--fs-scale, 1))}.sql-lab .schema-viewer .empty-state{display:flex;align-items:center;justify-content:center;padding:40px 20px;color:var(--text-secondary);font-size:calc(13px * var(--fs-scale, 1));text-align:center}@media screen and (max-width:768px){.sql-lab .schema-viewer{overflow:visible;height:auto}.sql-lab .schema-content{padding:12px;overflow-y:visible}.sql-lab .table-header{padding:12px}.sql-lab .columns-table{display:block;overflow-x:auto}.sql-lab .columns-table thead,.sql-lab .columns-table tbody,.sql-lab .columns-table tr{display:table;width:100%;table-layout:fixed}.sql-lab .sample-query-button{width:100%;justify-content:center;min-height:40px}}.sql-lab .results-panel{display:flex;flex-direction:column;height:100%;min-height:0;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;overflow:hidden}.sql-lab .results-header{display:flex;justify-content:space-between;align-items:center;flex-shrink:0;border-bottom:1px solid var(--border-color)}.sql-lab .tabs{display:flex;width:100%;padding:0 8px}.sql-lab .tab{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 12px;background:transparent;border:none;font-size:calc(12.5px * var(--fs-scale, 1));font-weight:500;color:var(--text-secondary);cursor:pointer;transition:color .15s ease}.sql-lab .tab:after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:2px 2px 0 0;background:transparent;transition:background-color .15s ease}.sql-lab .tab:hover,.sql-lab .tab.active{color:var(--text-primary)}.sql-lab .tab.active:after{background:var(--orange-primary)}.sql-lab .tab-badge{display:inline-flex;align-items:center;height:18px;padding:0 7px;border-radius:999px;background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);font-size:calc(11px * var(--fs-scale, 1));font-weight:600;font-variant-numeric:tabular-nums}.sql-lab .tab.active .tab-badge{background:var(--orange-subtle);border-color:var(--orange-border);color:var(--orange-primary)}.sql-lab .validation-banner{display:flex;align-items:center;gap:10px;flex-shrink:0;padding:10px 16px;font-size:calc(13px * var(--fs-scale, 1));font-weight:500;border-bottom:1px solid}.sql-lab .validation-banner.success{background:var(--color-success-bg);color:var(--success);border-color:var(--color-success-border)}.sql-lab .validation-banner.incorrect,.sql-lab .validation-banner.error{background:var(--color-error-bg);color:var(--error);border-color:var(--color-error-border)}.sql-lab .validation-icon{font-size:calc(15px * var(--fs-scale, 1));font-weight:700;line-height:1}.sql-lab .validation-message{flex:1}.sql-lab .results-content{flex:1;overflow:auto;min-height:0}.sql-lab .empty-state{display:flex;align-items:center;justify-content:center;height:100%;min-height:120px;color:var(--text-tertiary);font-size:calc(13px * var(--fs-scale, 1))}.sql-lab .error-message{margin:16px;padding:12px 16px;border:1px solid var(--color-error-border);border-left:3px solid var(--error);border-radius:8px;background:var(--color-error-bg);color:var(--error);font-family:var(--font-mono);font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.6;white-space:pre-wrap;word-break:break-word}.sql-lab .table-wrapper{overflow:auto;padding:12px 16px 16px}.sql-lab .results-table{width:100%;border-collapse:separate;border-spacing:0;font-size:calc(12.5px * var(--fs-scale, 1));font-variant-numeric:tabular-nums;border:1px solid var(--border-color);border-radius:8px;overflow:hidden}.sql-lab .results-table thead{position:sticky;top:0;z-index:1}.sql-lab .results-table th{padding:8px 14px;text-align:left;background:var(--bg-tertiary);font-size:calc(11px * var(--fs-scale, 1));font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--text-secondary);border-bottom:1px solid var(--border-color);white-space:nowrap}.sql-lab .results-table td{padding:8px 14px;border-bottom:1px solid var(--color-hairline);color:var(--text-primary);font-family:var(--font-mono);font-size:calc(12px * var(--fs-scale, 1))}.sql-lab .results-table tbody tr:nth-child(2n) td{background:var(--color-overlay)}.sql-lab .results-table tbody tr:hover td{background:var(--orange-subtle)}.sql-lab .results-table tbody tr:last-child td{border-bottom:none}.sql-lab .null-value{color:var(--tone-null);font-style:italic}.sql-lab .schema-tab-content{flex:1;min-height:0;overflow:hidden}@media screen and (max-width:768px){.sql-lab .results-panel{height:auto;overflow:visible}.sql-lab .results-content{overflow-y:visible;max-height:none;height:auto}.sql-lab .tab{padding:0 10px;min-height:44px}.sql-lab .table-wrapper{padding:12px;-webkit-overflow-scrolling:touch}.sql-lab .results-table td{white-space:nowrap}.sql-lab .results-table th:first-child,.sql-lab .results-table td:first-child{position:sticky;left:0;background:var(--bg-secondary);z-index:2}.sql-lab .results-table thead th:first-child{background:var(--bg-tertiary);z-index:3}}.sql-lab .solution-panel{border:1px solid var(--border-color);border-radius:12px;background:var(--bg-secondary);overflow:hidden}.sql-lab .solution-panel.is-open{border-color:var(--orange-border)}.sql-lab .solution-panel__toggle{display:flex;align-items:center;gap:10px;width:100%;padding:11px 14px;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;text-align:left;transition:color .15s ease,background-color .15s ease}.sql-lab .solution-panel__toggle:hover{background:var(--bg-tertiary);color:var(--text-primary)}.sql-lab .solution-panel__chevron{display:inline-block;font-size:calc(15px * var(--fs-scale, 1));line-height:1;transition:transform .18s ease}.sql-lab .solution-panel__chevron.is-open{transform:rotate(90deg)}.sql-lab .solution-panel__label{font-size:calc(13px * var(--fs-scale, 1));font-weight:600}.sql-lab .solution-panel__hint{margin-left:auto;font-size:calc(11.5px * var(--fs-scale, 1));color:var(--text-tertiary)}.sql-lab .solution-panel__body{border-top:1px solid var(--border-color);padding:14px}.sql-lab .solution-panel__code{margin:0;padding:12px 14px;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-primary);color:var(--text-primary);font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.65;white-space:pre-wrap;word-break:break-word;overflow-x:auto}.sql-lab .solution-panel__actions{display:flex;gap:8px;margin-top:12px}.sql-lab .solution-panel__action{height:30px;padding:0 13px;border:1px solid var(--border-color);border-radius:7px;background:transparent;font-size:calc(12px * var(--fs-scale, 1));font-weight:500;color:var(--text-secondary);cursor:pointer;transition:border-color .15s ease,color .15s ease,background-color .15s ease}.sql-lab .solution-panel__action:hover{border-color:var(--border-medium);background:var(--bg-tertiary);color:var(--text-primary)}.sql-lab .solution-panel__action--primary{border-color:var(--orange-border);background:var(--orange-subtle);color:var(--orange-primary)}.sql-lab .solution-panel__action--primary:hover{border-color:var(--orange-primary);background:var(--orange-primary);color:#111010}.sql-lab .lesson-flow{flex:1;min-width:0;height:100%;overflow:hidden;background:var(--bg-primary)}.sql-lab .lesson-flow__scroll{height:100%;overflow-y:auto;padding:36px 40px 96px}.sql-lab .lesson-flow--empty{display:grid;place-items:center;color:var(--text-tertiary);font-size:calc(14px * var(--fs-scale, 1))}.sql-lab .lesson-flow__header{max-width:760px;margin-bottom:36px}.sql-lab .lesson-flow__crumbs{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:calc(11.5px * var(--fs-scale, 1));letter-spacing:.02em;color:var(--text-tertiary)}.sql-lab .lesson-flow__dot{color:var(--border-medium)}.sql-lab .lesson-flow__title{margin:12px 0 0;font-size:calc(30px * var(--fs-scale, 1));font-weight:600;letter-spacing:-.025em;line-height:1.15;color:var(--text-primary)}.sql-lab .lesson-flow__tagline{margin:12px 0 0;font-size:calc(15px * var(--fs-scale, 1));line-height:1.65;color:var(--text-secondary)}.sql-lab .lesson-flow__section{max-width:1100px;margin-bottom:36px}.sql-lab .lesson-flow__section--flush{margin-bottom:12px}.sql-lab .lesson-flow__section--flush+.lesson-flow__section:not(.lesson-flow__section--flush){margin-top:36px}.sql-lab .lesson-flow__section-head{margin-bottom:14px}.sql-lab .lesson-flow__section-head h2{margin:0;font-size:calc(11.5px * var(--fs-scale, 1));font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--orange-primary)}.sql-lab .lesson-flow__section-head p{margin:4px 0 0;font-size:calc(13px * var(--fs-scale, 1));color:var(--text-tertiary)}.sql-lab .lesson-flow__context{padding:14px 18px;border-left:3px solid var(--orange-border);border-radius:0 10px 10px 0;background:var(--bg-secondary);font-size:calc(14px * var(--fs-scale, 1));line-height:1.7;color:var(--text-secondary)}.sql-lab .lesson-flow__task{margin-top:12px;padding:14px 18px;border-left:3px solid var(--orange-primary);border-radius:0 10px 10px 0;background:var(--orange-subtle);font-size:calc(14.5px * var(--fs-scale, 1));line-height:1.7;color:var(--text-primary)}.sql-lab .lesson-flow__task strong{color:var(--orange-primary);font-weight:600}.sql-lab .lesson-flow__hint-row{margin-top:12px}.sql-lab .lesson-flow__hint-toggle,.sql-lab .lesson-flow__schema-toggle{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 14px;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-secondary);font-size:calc(12.5px * var(--fs-scale, 1));font-weight:500;color:var(--text-secondary);cursor:pointer;transition:border-color .15s ease,color .15s ease,background-color .15s ease}.sql-lab .lesson-flow__hint-toggle:hover,.sql-lab .lesson-flow__schema-toggle:hover{border-color:var(--border-medium);background:var(--bg-tertiary);color:var(--text-primary)}.sql-lab .lesson-flow__hint{margin-top:10px;padding:12px 16px;border:1px dashed var(--orange-border);border-radius:8px;font-size:calc(13px * var(--fs-scale, 1));line-height:1.65;color:var(--text-secondary)}.sql-lab .lesson-flow__editor{height:280px}.sql-lab .lesson-flow__results{min-height:240px;max-height:460px;display:flex;flex-direction:column}.sql-lab .lesson-flow__chevron{display:inline-block;transition:transform .18s ease;font-size:calc(15px * var(--fs-scale, 1));line-height:1}.sql-lab .lesson-flow__chevron.is-open{transform:rotate(90deg)}.sql-lab .lesson-flow__schema{margin-top:14px;height:420px;border:1px solid var(--border-color);border-radius:12px;overflow:hidden}@media screen and (max-width:768px){.sql-lab .lesson-flow__scroll{padding:20px 16px 96px}.sql-lab .lesson-flow__title{font-size:calc(24px * var(--fs-scale, 1))}}.sql-lab .lesson-flow__context code,.sql-lab .lesson-flow__task code,.sql-lab .lesson-flow__hint code{padding:1px 6px;border-radius:5px;border:1px solid var(--border-color);background:var(--bg-tertiary);font-size:.92em;color:var(--text-primary)}.sql-lab .split-content-area{flex:1;display:flex;min-width:0;height:100%;overflow:hidden;background:var(--bg-primary)}.sql-lab .left-panel{display:flex;flex-direction:column;height:100%;overflow:hidden;border-right:1px solid var(--border-color)}.sql-lab .right-panel{display:flex;flex-direction:column;flex:1;min-width:200px;height:100%;overflow:hidden}.sql-lab .problem-section{display:flex;flex-direction:column;overflow:hidden;background:var(--bg-secondary)}.sql-lab .problem-header{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;flex-shrink:0;padding:14px 20px;border-bottom:1px solid var(--border-color)}.sql-lab .problem-title-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;flex:1 1 240px;min-width:0}.sql-lab .problem-title-row h2{margin:0;font-size:calc(18px * var(--fs-scale, 1));font-weight:600;letter-spacing:-.01em;color:var(--text-primary)}.sql-lab .problem-actions{display:flex;gap:8px;align-items:center;flex-shrink:0}.sql-lab .action-button{display:inline-flex;align-items:center;height:30px;padding:0 12px;border:1px solid var(--orange-border);border-radius:7px;background:var(--orange-subtle);color:var(--orange-primary);font-size:calc(12px * var(--fs-scale, 1));font-weight:600;white-space:nowrap;cursor:pointer;transition:background-color .15s ease,border-color .15s ease,color .15s ease}.sql-lab .action-button:hover:not(:disabled){background:var(--orange-primary);border-color:var(--orange-primary);color:#111010}.sql-lab .action-button.hint-button-small{background:transparent;color:var(--text-secondary);border-color:var(--border-color);font-weight:500}.sql-lab .action-button.hint-button-small:hover{background:var(--bg-tertiary);border-color:var(--border-medium);color:var(--text-primary)}.sql-lab .action-button.loaded{background:var(--color-success-bg);border-color:var(--color-success-border);color:var(--success);cursor:default}.sql-lab .action-button:disabled{cursor:not-allowed}.sql-lab .problem-content{flex:1;overflow-y:auto;padding:20px}.sql-lab .problem-description{margin:0 0 16px;color:var(--text-secondary);font-size:calc(14px * var(--fs-scale, 1));line-height:1.65}.sql-lab .problem-task{margin:16px 0;padding:12px 16px;border-radius:8px;border-left:3px solid var(--orange-primary);background:var(--bg-tertiary);color:var(--text-primary);font-size:calc(14px * var(--fs-scale, 1));line-height:1.65}.sql-lab .lesson-context{margin:16px 0;padding:12px 16px;border-radius:8px;border-left:3px solid var(--orange-border);background:var(--bg-tertiary);color:var(--text-secondary);font-size:calc(13px * var(--fs-scale, 1));line-height:1.6}.sql-lab .hint-box{margin:16px 0;padding:12px 16px;border:1px dashed var(--orange-border);border-radius:8px;color:var(--text-secondary);font-size:calc(13px * var(--fs-scale, 1));line-height:1.6}.sql-lab .difficulty-badge{display:inline-flex;align-items:center;height:20px;padding:0 8px;border-radius:999px;border:1px solid transparent;font-size:calc(10.5px * var(--fs-scale, 1));font-weight:600;letter-spacing:.05em;text-transform:uppercase}.sql-lab .difficulty-badge.easy{background:var(--color-success-bg);color:var(--success);border-color:var(--color-success-border)}.sql-lab .difficulty-badge.medium{background:var(--color-warning-bg);color:var(--warning);border-color:var(--color-warning-border)}.sql-lab .difficulty-badge.hard{background:var(--color-error-bg);color:var(--error);border-color:var(--color-error-border)}.sql-lab .challenge-problem{margin:16px 0;padding:14px 16px;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-primary);overflow-x:auto}.sql-lab .challenge-problem pre{margin:0;font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.6;color:var(--text-primary);white-space:pre}.sql-lab .challenge-example{margin:16px 0;padding:12px 16px;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-primary)}.sql-lab .challenge-example summary{cursor:pointer;-webkit-user-select:none;user-select:none;color:var(--text-primary);font-weight:500;font-size:calc(13px * var(--fs-scale, 1))}.sql-lab .challenge-example pre{margin-top:12px;font-size:calc(12.5px * var(--fs-scale, 1));line-height:1.6;color:var(--text-primary);overflow-x:auto}.sql-lab .schema-section{display:flex;flex-direction:column;overflow:hidden;background:var(--bg-secondary)}.sql-lab .editor-section,.sql-lab .results-section{display:flex;flex-direction:column;overflow:hidden;padding:12px}.sql-lab .editor-section{padding-bottom:0}.sql-lab .results-section{padding-top:0}.sql-lab .resize-handle-horizontal{width:6px;flex-shrink:0;cursor:ew-resize;position:relative;display:flex;align-items:center;justify-content:center;background:transparent;transition:background .15s ease;z-index:10;-webkit-user-select:none;user-select:none}.sql-lab .resize-handle-vertical{height:12px;flex-shrink:0;cursor:ns-resize;position:relative;display:flex;align-items:center;justify-content:center;background:transparent;transition:background .15s ease;z-index:10;-webkit-user-select:none;user-select:none}.sql-lab .resize-handle-horizontal:hover,.sql-lab .resize-handle-horizontal.dragging,.sql-lab .resize-handle-vertical:hover,.sql-lab 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var(--space-md);background-color:var(--color-error-bg);border:1px solid var(--color-error-border);border-left:3px solid var(--color-error);color:var(--color-error);margin-top:var(--space-sm);border-radius:var(--radius-md);font-family:var(--font-mono);font-size:var(--text-sm);white-space:pre-wrap;word-break:break-word}.lab .preview-pane__error-icon{font-weight:var(--font-bold);flex-shrink:0}.lab .preview-pane__return{font-family:var(--font-mono);font-size:var(--text-sm);background-color:var(--color-bg-tertiary);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);overflow-x:auto}.lab .preview-pane__return code{color:var(--color-text-primary);background:none;padding:0}.lab .validation-panel__run-btn{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 var(--space-md);margin:0 var(--space-xs);background:var(--color-orange-primary);color:#111010;border-radius:var(--radius-sm);font-size:var(--text-xs);font-weight:var(--font-semibold);letter-spacing:.02em;transition:background-color var(--transition-fast),transform var(--transition-fast),opacity var(--transition-fast)}.lab .validation-panel__run-btn:hover:not(:disabled){background:var(--color-orange-hover)}.lab .validation-panel__run-btn:active:not(:disabled){transform:translateY(1px)}.lab .validation-panel__run-btn:disabled{opacity:.5}.lab .validation-panel__content{flex:1;min-height:0;overflow-y:auto;padding:var(--space-md) var(--space-lg) var(--space-xl);scroll-behavior:smooth}.lab .validation-panel__loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-md);padding:var(--space-2xl);color:var(--color-text-secondary);font-size:var(--text-sm)}.lab .validation-panel__spinner{width:28px;height:28px;border:2.5px solid var(--color-border);border-top-color:var(--color-orange-primary);border-radius:50%;animation:spin .8s linear infinite}.lab .validation-panel__empty{display:flex;align-items:center;justify-content:center;height:100%;text-align:center;padding:var(--space-2xl);color:var(--color-text-muted);font-size:var(--text-sm)}.lab .validation-panel__results{display:flex;flex-direction:column;gap:var(--space-md)}.lab .validation-panel__success{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background-color:var(--color-success-bg);border:1px solid var(--color-success-border);border-radius:var(--radius-md);color:var(--color-success)}.lab .validation-panel__success-icon{width:24px;height:24px;flex-shrink:0}.lab .validation-panel__success h3{font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--color-success);margin-bottom:2px}.lab .validation-panel__success p{font-size:var(--text-sm);color:var(--color-success);opacity:.85}.lab 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