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.chapter-card__number{background-color:var(--color-green-light);border-color:var(--color-green-pastel);color:#2e7d32}.chapter-card--locked .chapter-card__number{background-color:var(--color-bg-secondary);border-color:var(--color-border);color:var(--color-text-muted)}.chapter-card__progress{margin-top:4px}.sidebar{width:260px;background:var(--color-sidebar-bg);border-right:1px solid var(--color-sidebar-border);overflow:hidden;transition:transform var(--transition-base);display:flex;flex-direction:column;color:var(--color-sidebar-text)}.code-editor{display:flex;flex-direction:column;height:100%;background:var(--color-bg-secondary);border-radius:var(--radius-md);overflow:hidden;border:1px solid rgba(0,0,0,.1);box-shadow:0 2px 8px #00000014}.code-editor__header{display:flex;align-items:center;justify-content:space-between;padding:8px var(--space-md);background:var(--color-bg-tertiary);border-bottom:1px solid 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var(--btn-shadow)}.mode-switcher{position:fixed;top:12px;left:50%;transform:translate(-50%);display:flex;gap:0;background:var(--bg-elevated);border:1px solid var(--btn-border);border-radius:10px;padding:4px;z-index:999;box-shadow:0 2px 8px #00000080}.mode-button{padding:8px 20px;background:transparent;color:var(--text-secondary);border:none;border-radius:7px;cursor:pointer;font-size:13px;font-weight:500;transition:all .15s ease;white-space:nowrap}.mode-button:hover{background:var(--btn-secondary-hover);color:var(--text-primary)}.mode-button.active{background:var(--btn-primary-bg);color:var(--btn-primary-text);box-shadow:0 1px 3px #0000004d;font-weight:500}.mode-button.do-not-click{color:var(--text-tertiary);font-style:italic}.mode-button.do-not-click:hover{background:#fb923c1a;color:var(--chai-accent)}@media screen and (max-width:768px){.mode-switcher{top:8px;left:56px;right:8px;transform:none;padding:2px;border-radius:6px;gap:0;width:auto}.mode-button{padding:6px 8px;font-size:11px;min-height:40px;border-radius:5px;flex:1}.reset-button{bottom:16px;right:16px;padding:10px 16px;font-size:12px;min-height:44px;border-radius:8px}}.sql-lab{width:100%;height:calc(100vh - 60px);display:flex;flex-direction:column;overflow:hidden;position:relative;--bg-primary: #000000 !important;--bg-secondary: #0a0a0a !important;--bg-tertiary: #121212 !important;--bg-elevated: #1a1a1a !important;--text-primary: #e4e4e4 !important;--text-secondary: #a0a0a0 !important;--text-tertiary: #707070 !important;--border-color: #1a1a1a !important;--border-light: #1a1a1a !important;--border-medium: #2a2a2a !important;--border-dark: #3a3a3a !important}.sql-lab .app{width:100%!important;height:100%!important;max-width:100%!important;max-height:100%!important;overflow:hidden!important;position:relative!important}.sql-lab .main-layout{width:100%!important;height:100%!important;max-height:100%!important;display:flex!important;flex-direction:row!important;overflow:hidden!important}.sql-lab .split-content-area{flex:1!important;display:flex!important;flex-direction:row!important;height:100%!important;max-height:100%!important;width:auto!important;overflow:hidden!important;padding-top:72px!important}.sql-lab .sidebar{width:300px!important;min-width:300px!important;max-width:300px!important;flex-shrink:0!important;height:100%!important}.sql-lab .left-panel{display:flex!important;flex-direction:column!important;height:100%!important;overflow:hidden!important;border-right:1px solid var(--border-color)}.sql-lab .right-panel{display:flex!important;flex-direction:column!important;height:100%!important;min-width:200px!important;flex:1!important;overflow:hidden!important}.sql-lab .mode-switcher{top:72px!important;z-index:998!important}:root{--chai-orange: #fb923c;--chai-orange-light: #fdba74;--chai-orange-dark: #f97316;--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--text-primary: #111827;--text-secondary: #6b7280;--text-tertiary: #9ca3af;--border-light: #e5e7eb;--border-medium: #d1d5db;--border-dark: #9ca3af;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--transition-fast: .15s ease-in-out;--transition-normal: .25s ease-in-out;--transition-slow: .35s ease-in-out;--z-navbar: 1000;--z-modal: 2000;--z-tooltip: 3000}@media(prefers-color-scheme:dark){:root{--bg-primary: #111827;--bg-secondary: #1f2937;--bg-tertiary: #374151;--text-primary: #f9fafb;--text-secondary: #d1d5db;--text-tertiary: #9ca3af;--border-light: #374151;--border-medium: #4b5563;--border-dark: #6b7280}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}#root{min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:.5rem}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}h4{font-size:1.25rem}h5{font-size:1.125rem}h6{font-size:1rem}p{margin-bottom:1rem}a{color:var(--chai-orange);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--chai-orange-dark)}button{font-family:inherit;cursor:pointer;border:none;background:none;transition:all var(--transition-fast)}.app-root{display:flex;flex-direction:column;min-height:100vh}.app-main{flex:1 1 auto;width:100%;overflow-y:auto}.container{width:100%;max-width:1280px;margin:0 auto;padding:0 1rem}.text-center{text-align:center}.text-orange{color:var(--chai-orange)}.bg-orange{background-color:var(--chai-orange)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-medium);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--border-dark)}