@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.visible{visibility:visible}.block{display:block}.inline{display:inline}.table{display:table}}:root{color:#172033;background:#f6f8fb;font-family:Inter,ui-sans-serif,system-ui,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input{font:inherit}.shell{width:min(100% - 32px,760px);margin:0 auto;padding:32px 0 48px}.auth-loading{color:#526070;text-align:center;min-height:100vh;padding-top:30vh}.auth-form{background:#fff;border:1px solid #e0e6ef;border-radius:16px;gap:16px;margin-top:24px;padding:20px;display:grid}.auth-form label{gap:6px;font-weight:700;display:grid}.auth-form input{border:1px solid #a9b7ce;border-radius:8px;width:100%;padding:11px}.auth-error{color:#7a3b12;background:#fff4e9;border:1px solid #e2a66b;border-radius:8px;margin:0;padding:10px}.auth-link{color:#526070;text-align:center}.app-nav{justify-content:space-between;align-items:center;max-width:760px;margin:0 auto;padding:12px;font-size:.9rem;display:flex}.app-nav a{color:#315ca8;font-weight:700;text-decoration:none}.app-nav-links{align-items:center;gap:10px;display:flex}.app-nav button{padding:7px 11px}.sticky-header{z-index:2;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#f6f8fbf5;padding:24px 0;position:sticky;top:0}.lesson-header{border-bottom:1px solid #d8dfeb}.eyebrow{color:#52658a;letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px;font-size:.78rem;font-weight:700}h1{letter-spacing:-.04em;margin:0;font-size:clamp(2rem,8vw,3.4rem);line-height:1.05}h2{margin:4px 0 8px;font-size:1.35rem}h3{margin:4px 0 8px;font-size:1.1rem}.meta{color:#526070;margin:16px 0 0;line-height:1.5}.progress-track{background:#dbe4f2;border-radius:999px;height:8px;margin-top:18px;overflow:hidden}.progress-track span{background:#315ca8;height:100%;transition:width .2s;display:block}.lesson-content{gap:18px;padding-top:24px;display:grid}.content-block>p,.content-block>h2,.content-block>h3{line-height:1.7}.lesson-card,.callout,.worked-example,.quiz-item,.formula,.interactive-placeholder,.completion-card{background:#fff;border:1px solid #e0e6ef;border-radius:16px;padding:20px;box-shadow:0 8px 24px #23395d0b}.lesson-card p,.callout p,.worked-example p,.interactive-placeholder p,.completion-card p{color:#526070;margin:0;line-height:1.65}.callout{border-left:5px solid #8ba4c9}.callout.why{background:#edf5ff;border-color:#a9c7f5}.callout.warning{border-color:#d99b52}.callout.jargon{border-color:#8d79bd}.responsive-table{margin:0;overflow:hidden}figcaption{margin:0 0 10px;font-weight:700}table{border-collapse:collapse;width:100%}th,td{text-align:left;vertical-align:top;border-bottom:1px solid #e0e6ef;padding:10px 8px}th{color:#52658a;font-size:.85rem}.formula code{color:#fff;background:#172033;border-radius:8px;margin:12px 0;padding:12px;font-size:1.2rem;display:block}.formula dl{margin:0}.formula dl div{gap:10px;display:flex}.formula dt{font-weight:700}.formula dd{color:#526070;margin:0}.worked-example h3{margin-top:0}.worked-step{gap:12px;margin:14px 0;display:flex}.worked-step span{color:#315ca8;background:#e7edf7;border-radius:50%;flex:0 0 28px;justify-content:center;align-items:center;height:28px;font-weight:700;display:flex}.quiz-block{gap:16px;display:grid}.quiz-item{margin:0}.quiz-item legend{padding:0;font-weight:700;line-height:1.45}.quiz-options{gap:8px;margin:16px 0;display:grid}.quiz-option{border:1px solid #d8dfeb;border-radius:10px;align-items:flex-start;gap:10px;padding:12px;display:flex}.quiz-option:has(input:checked){background:#f0f5ff;border-color:#315ca8}.numeric-answer{align-items:center;gap:8px;margin:16px 0;display:flex}.numeric-answer input{border:1px solid #a9b7ce;border-radius:8px;max-width:180px;padding:10px}.quiz-item button,button{color:#fff;cursor:pointer;background:#315ca8;border:0;border-radius:8px;padding:10px 16px}button:disabled{cursor:not-allowed;opacity:.45}.answer-feedback{border-radius:10px;margin-top:14px;padding:12px}.answer-feedback.correct{background:#e9f7ef;border:1px solid #85c99b}.answer-feedback.incorrect{background:#fff4e9;border:1px solid #e2a66b}.answer-feedback p{margin:8px 0 0;line-height:1.55}.answer-feedback ol{margin-bottom:0;padding-left:24px}.hint{color:#526070;font-size:.9rem}.checkpoint{background:#edf5ff;border-color:#a9c7f5}.checkpoint.locked{background:#f0f1f4;border-color:#c4cad4}.advance-button{margin-top:24px}.completion-card{margin-top:18px}.completion-card button{margin-top:14px}.lesson-footer{color:#526070;text-align:center;padding-top:28px;font-size:.9rem}.error{color:#8b2635}.builder-page{padding-bottom:64px}.builder-header{gap:12px;margin-bottom:22px;display:grid}.builder-header .meta{margin:0}.secondary-button{background:#526070;justify-self:start}.builder-form{background:#fff;border:1px solid #e0e6ef;border-radius:16px;gap:14px;padding:18px;display:grid}.builder-grid{gap:14px;display:grid}.builder-card{border:1px solid #d8dfeb;border-radius:12px;gap:10px;margin:0;padding:14px;display:grid}.builder-card legend,.style-switch legend{padding:0 5px;font-weight:700}.line-editor{grid-template-columns:1fr 1fr;gap:10px;display:grid}.builder-field{gap:5px;font-weight:700;display:grid}.builder-field input,.builder-field select{border:1px solid #a9b7ce;border-radius:8px;width:100%;min-width:0;padding:10px}.builder-field input[type=range]{accent-color:#315ca8;padding:0}.slider-value{margin:-5px 0 0;font-weight:700}.builder-error{color:#7a3b12;background:#fff4e9;border:1px solid #e2a66b;border-radius:8px;margin:0;padding:10px}.builder-result{background:#f0f5ff;border:1px solid #a9c7f5;border-radius:16px;margin-top:18px;padding:18px}.builder-result h2{margin-top:0}.result-line{overflow-wrap:anywhere;margin:7px 0}.workings{border-top:1px solid #c7d6ef;margin-top:18px;padding-top:14px}.workings h3{margin-top:0}.working-card{overflow-wrap:anywhere;background:#fff;border:1px solid #d8dfeb;border-radius:9px;flex-wrap:wrap;gap:8px 14px;margin:7px 0;padding:9px;display:flex}.style-switch{border:1px solid #d8dfeb;border-radius:10px;flex-wrap:wrap;gap:14px;padding:12px;display:flex}.review-page{gap:16px;display:grid}.review-card{background:#fff;border:1px solid #a9c7f5;border-radius:16px;padding:24px}.review-card h2{font-size:clamp(1.4rem,6vw,2rem);line-height:1.25}.review-back{border-top:1px solid #d8dfeb;margin-top:18px;padding-top:18px}.review-back p:first-child{font-size:1.25rem;font-weight:700}.reveal-button{background:#526070;margin-top:12px}.rating-panel{background:#edf5ff;border:1px solid #a9c7f5;border-radius:16px;padding:18px}.rating-panel>p{margin-top:0}.rating-buttons{grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.rating-buttons button{gap:5px;min-width:0;padding:12px 8px;display:grid}.rating-buttons span{font-size:.78rem;font-weight:400}.review-summary{background:#fff;border:1px solid #e0e6ef;border-radius:16px;padding:18px}.review-summary-row{border-top:1px solid #e0e6ef;justify-content:space-between;gap:12px;padding:12px 0;display:flex}.review-summary-row strong{white-space:nowrap}.primary-link{color:#fff;background:#315ca8;border-radius:8px;justify-self:start;padding:10px 16px;text-decoration:none}.dashboard{gap:16px;display:grid}.dashboard-card,.track-card,.lesson-list-item,.planned-lesson{background:#fff;border:1px solid #e0e6ef;border-radius:16px;padding:18px}.dashboard-card h2,.track-card h2{margin-top:0}.dashboard-card .primary-link{margin-top:12px;display:inline-block}.dashboard-row{justify-content:space-between;align-items:center;display:flex}.dashboard-number{font-size:2rem;display:block}.dashboard-stats{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.dashboard-stats div{gap:4px;display:grid}.dashboard-stats span{color:#526070;font-size:.85rem}.dashboard-list,.track-list,.lesson-list{gap:12px;margin:0;padding:0;list-style:none;display:grid}.track-card,.lesson-list-item{color:inherit;text-decoration:none}.track-card p{color:#526070;line-height:1.5}.lesson-list{margin:24px 0}.lesson-list-item,.planned-lesson{justify-content:space-between;gap:12px;display:flex}.lesson-list-item span,.planned-lesson span{color:#526070;font-size:.9rem}.planned-lesson{color:#7c8490}.gate-page{gap:16px;display:grid}.check-row{align-items:flex-start;gap:10px;margin:14px 0;line-height:1.5;display:flex}.check-row input{flex:none;margin-top:4px}@media(max-width:480px){.app-nav{align-items:flex-start;gap:8px}.app-nav-links{flex-wrap:wrap;justify-content:flex-end}.dashboard-stats{grid-template-columns:1fr}.builder-page{width:calc(100% - 24px)}.line-editor{grid-template-columns:1fr}.style-switch{display:grid}.builder-result{padding:14px}.rating-buttons{grid-template-columns:repeat(2,1fr)}.review-summary-row{align-items:flex-start;display:grid}.shell{width:calc(100% - 24px);padding-top:16px}.sticky-header{padding:16px 0}.lesson-card,.callout,.worked-example,.quiz-item,.formula,.interactive-placeholder,.completion-card{padding:16px}.responsive-table table,.responsive-table thead,.responsive-table tbody,.responsive-table tr,.responsive-table td{display:block}.responsive-table thead{display:none}.responsive-table tr{border-bottom:1px solid #e0e6ef;padding:8px 0}.responsive-table td{border:0;grid-template-columns:40% 60%;padding:5px 0;display:grid}.responsive-table td:before{color:#52658a;content:attr(data-label);padding-right:8px;font-weight:700}}
