.lesson-shell { display: grid; grid-template-columns: minmax(0,1fr) 220px; gap: clamp(32px, 5vw, 72px); align-items: start; }
.lesson-toc { position: sticky; top: calc(var(--header-h) + 24px); }
.lesson-toc nav { display: grid; gap: 2px; }
.lesson-toc a { min-height: 36px; display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-left: 1px solid var(--line); color: var(--text-3); font-size: 12px; }
.lesson-toc a.active { border-color: var(--accent); color: var(--text); }
.lesson-unit { padding: clamp(28px, 5vw, 56px) 0; border-top: 1px solid var(--line); }
.lesson-unit:first-child { border-top: 0; padding-top: 0; }
.lesson-unit h2 { font-size: var(--fs-4); }
.lesson-prose { max-width: var(--reading-max); }
.activity-card { margin-top: 22px; padding: clamp(18px, 3vw, 28px); border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow-1); }
.activity-options { display: grid; gap: 9px; margin-top: 18px; }
.activity-option { min-height: 48px; display: flex; align-items: center; gap: 10px; padding: 10px 12px; text-align: left; border: 1px solid var(--line); background: var(--bg-elevated); border-radius: var(--radius-s); }
.activity-option:hover { border-color: var(--line-strong); }
.activity-feedback { margin-top: 16px; padding: 14px 16px; border-top: 1px solid var(--line); color: var(--text-2); }
.activity-feedback strong { color: var(--text); }

.button-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 7px; }
.meta-row > span { min-height: 28px; display: inline-flex; align-items: center; padding: 5px 9px; border: 1px solid var(--line); border-radius: var(--radius-pill); color: var(--text-3); font-size: 11px; }
.quiet-link { color: var(--text-2); font-weight: 720; text-decoration: underline; text-underline-offset: 4px; text-decoration-color: var(--line-strong); }
.micro-note { font-size: 12px; color: var(--text-3); }
.home-hero { min-height: min(67vh, 680px); display: grid; grid-template-columns: minmax(0,1fr) minmax(250px,.6fr); align-items: center; gap: clamp(28px,6vw,92px); border-bottom: 1px solid var(--line); }
.home-hero__copy .section-heading { margin-bottom: 22px; }
.home-hero__system { min-height: 330px; position: relative; display: grid; place-items: center; align-content: center; gap: 18px; padding: 28px; border-left: 1px solid var(--line); font: 700 10px/1 var(--font-mono); letter-spacing: .12em; color: var(--text-3); }
.home-hero__system span { width: min(220px,100%); min-height: 44px; display: grid; place-items: center; border: 1px solid var(--line); background: var(--surface); }
.home-hero__system i { height: 20px; width: 1px; background: var(--accent); opacity: .75; }
.home-grid { display: grid; grid-template-columns: 1.4fr 1fr; border-bottom: 1px solid var(--line); }
.dashboard-panel { min-height: 270px; padding: clamp(24px,4vw,42px); border-right: 1px solid var(--line); border-top: 1px solid var(--line); }
.dashboard-panel:nth-child(even) { border-right: 0; }
.dashboard-panel h2 { margin-top: 18px; font-size: var(--fs-4); }
.dashboard-panel--lead { min-height: 360px; }
.class-number { margin-top: 18px; font: 720 clamp(48px,7vw,96px)/.9 var(--font-mono); letter-spacing: -.08em; color: var(--accent); }
.skill-mini-list { display: grid; gap: 8px; margin-top: 20px; }
.skill-mini-list > div { display: flex; justify-content: space-between; gap: 20px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.home-achievements { padding: 34px 0; }
.achievement-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 15px; }
.achievement-pill { padding: 8px 11px; border: 1px solid var(--line); border-radius: var(--radius-pill); font-size: 11px; font-weight: 700; }
.progress-stack { display: grid; gap: 8px; max-width: 620px; }
.progress-label { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-3); }
.progress-label strong { color: var(--text); }
.course-path { margin-top: clamp(34px,5vw,64px); border-top: 1px solid var(--line); }
.course-block { display: grid; grid-template-columns: 190px minmax(0,1fr); border-bottom: 1px solid var(--line); }
.course-block__header { padding: 30px 24px 30px 0; display: flex; flex-direction: column; gap: 12px; color: var(--text-3); }
.course-class-list { border-left: 1px solid var(--line); }
.course-card { display: grid; grid-template-columns: 78px minmax(0,1fr) 38px; gap: 18px; padding: clamp(22px,3vw,34px); border-bottom: 1px solid var(--line); transition: background var(--dur-fast), transform var(--dur-fast); }
.course-card:last-child { border-bottom: 0; }
.course-card:hover { background: var(--surface-2); }
.course-card__index { font: 720 26px/1 var(--font-mono); color: var(--text-3); }
.course-card--current .course-card__index, .course-card--completed .course-card__index { color: var(--accent); }
.course-card--undiscovered { opacity: .72; }
.course-card__copy h2 { margin: 11px 0 8px; font-size: var(--fs-3); }
.course-card__copy p { max-width: 780px; margin-bottom: 16px; }
.course-card__top { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--text-3); font-size: 11px; }
.course-card__arrow { align-self: center; color: var(--text-3); }
.lesson-hero { min-height: 390px; display: flex; flex-direction: column; justify-content: center; padding-bottom: clamp(44px,6vw,76px); }
.lesson-hero h1 { max-width: 900px; margin: 18px 0 16px; font-size: var(--fs-5); }
.lesson-hero > p { max-width: 780px; font-size: var(--fs-3); }
.lesson-hero__meta { display: flex; gap: 9px; color: var(--text-3); font: 700 10px/1 var(--font-mono); letter-spacing: .08em; }
.lesson-unit__head { max-width: var(--reading-max); display: flex; align-items: start; justify-content: space-between; gap: 22px; margin-bottom: 20px; }
.lesson-unit__head h2 { margin: 10px 0 0; }
.unit-time { flex: 0 0 auto; color: var(--text-3); font: 650 10px/1 var(--font-mono); }
.lesson-prose p { font-size: clamp(15px,1.4vw,17px); line-height: 1.72; }
.lesson-bullets, .check-list { padding-left: 1.2em; color: var(--text-2); }
.lesson-bullets li, .check-list li { margin: 8px 0; }
.check-list { list-style: none; padding-left: 0; }
.check-list li { padding-left: 24px; position: relative; }
.check-list li::before { content: '✓'; position: absolute; left: 0; color: var(--signal); }
.concept-flow { display: grid; grid-template-columns: repeat(auto-fit,minmax(130px,1fr)); gap: 1px; margin: 24px 0; background: var(--line); border: 1px solid var(--line); }
.concept-flow__item { min-height: 112px; display: grid; align-content: space-between; padding: 14px; background: var(--surface); }
.concept-flow__item span { color: var(--accent); font: 700 10px/1 var(--font-mono); }
.concept-flow__item strong { font-size: 13px; }
.comparison-table { margin: 24px 0; border: 1px solid var(--line); overflow-x: auto; }
.comparison-row { min-width: 680px; display: grid; grid-template-columns: 130px repeat(3,minmax(160px,1fr)); border-bottom: 1px solid var(--line); }
.comparison-row:last-child { border-bottom: 0; }
.comparison-row > * { padding: 11px 13px; border-right: 1px solid var(--line); font-size: 12px; }
.comparison-row > *:last-child { border-right: 0; }
.comparison-row--head { background: var(--surface-2); color: var(--text-3); }
.lesson-card-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; margin: 24px 0; }
.micro-card { min-height: 130px; padding: 16px; border: 1px solid var(--line); background: var(--surface); }
.micro-card__index { color: var(--accent); font: 700 11px/1 var(--font-mono); }
.micro-card h3 { margin: 14px 0 7px; font-size: 14px; }
.micro-card p { font-size: 13px; margin: 0; }
.workflow-list { list-style: none; padding: 0; margin: 24px 0; border-top: 1px solid var(--line); }
.workflow-list li { display: grid; grid-template-columns: 54px 1fr; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.workflow-list li > span { color: var(--accent); font: 700 10px/1 var(--font-mono); }
.workflow-list p { font-size: 13px; margin: 5px 0 0; }
.lesson-code { overflow-x: auto; padding: 18px; border: 1px solid var(--line); background: var(--bg-elevated); font: 12px/1.6 var(--font-mono); }
.key-value-list { display: grid; grid-template-columns: minmax(120px,.4fr) 1fr; border-top: 1px solid var(--line); }
.key-value-list dt, .key-value-list dd { margin: 0; padding: 12px 0; border-bottom: 1px solid var(--line); }
.key-value-list dt { color: var(--text-3); font-weight: 700; }
.key-value-list dd { color: var(--text-2); }
.activity-card__head h3 { margin: 8px 0 0; font-size: var(--fs-3); }
.activity-context { margin-top: 14px; }
.activity-field { display: grid; gap: 7px; }
.activity-field__label { font-size: 12px; font-weight: 700; }
.activity-map, .activity-rubric, .activity-checklist { display: grid; gap: 10px; margin-top: 18px; }
.activity-check { min-height: 46px; display: flex; gap: 10px; align-items: center; padding: 10px 12px; border: 1px solid var(--line); background: var(--bg-elevated); }
.activity-check input, .activity-option input { width: 18px; height: 18px; min-height: 0; padding: 0; flex: 0 0 auto; }
.activity-sort-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 6px; }
.activity-sort-item { min-height: 52px; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 8px 8px 14px; border: 1px solid var(--line); background: var(--bg-elevated); }
.activity-sort-actions { display: flex; gap: 4px; }
.activity-sort-actions .icon-button { width: 36px; height: 36px; }
.activity-rubric-row { display: grid; grid-template-columns: minmax(120px,1fr) minmax(130px,1fr) 52px; align-items: center; gap: 12px; }
.activity-rubric-row input { min-height: 0; padding: 0; }
.activity-actions { margin-top: 16px; }
.activity-feedback[data-correct='true'] { border-left: 2px solid var(--signal); }
.external-mission, .project-milestone, .checkpoint-zone, .lesson-close { max-width: var(--reading-max); margin-top: 24px; padding: clamp(18px,3vw,28px); border: 1px solid var(--line); background: var(--surface); }
.external-mission__head { display: flex; justify-content: space-between; gap: 16px; font-size: 11px; color: var(--text-3); }
.project-fields-preview { display: flex; flex-wrap: wrap; gap: 7px; margin: 18px 0; }
.project-fields-preview span { padding: 7px 9px; background: var(--surface-2); border: 1px solid var(--line); font-size: 11px; }
.checkpoint-zone .activity-card { box-shadow: none; }
.checkpoint-result, .completion-status { margin-top: 16px; padding: 14px; border-top: 1px solid var(--line); }
.next-note { padding-top: 18px; border-top: 1px solid var(--line); }
.anonymous-banner { position: sticky; top: var(--header-h); z-index: 20; display: flex; align-items: center; gap: 10px; padding: 10px 14px; border: 1px solid var(--line); background: var(--bg-elevated); font-size: 11px; }
.anonymous-banner span { color: var(--text-3); }
.anonymous-banner a { margin-left: auto; text-decoration: underline; }

.project-overview { position: sticky; top: var(--header-h); z-index: 18; display: grid; grid-template-columns: minmax(240px,1fr) auto; gap: 28px; align-items: center; margin: 0 calc(var(--page-gutter) * -1) 34px; padding: 16px var(--page-gutter); border-block: 1px solid var(--line); background: color-mix(in srgb,var(--bg) 92%,transparent); backdrop-filter: blur(14px); }
.project-timeline { display: flex; gap: 4px; overflow-x: auto; padding: 2px; }
.project-timeline a { width: 34px; height: 34px; flex: 0 0 34px; display: grid; place-items: center; border: 1px solid var(--line); color: var(--text-3); font: 700 10px/1 var(--font-mono); }
.project-timeline a.done { border-color: var(--signal); color: var(--text); background: var(--signal-soft); }
.project-stages { border-top: 1px solid var(--line); }
.project-stage { padding: clamp(30px,5vw,62px) 0; border-bottom: 1px solid var(--line); }
.project-stage__head { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 24px; align-items: start; margin-bottom: 28px; }
.project-stage__head h2 { margin: 12px 0 9px; font-size: var(--fs-4); }
.project-stage__head p { max-width: 760px; margin: 0; }
.project-stage--complete { background: linear-gradient(90deg,var(--signal-soft),transparent 36%); }
.project-form-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; max-width: 980px; }
.project-form-grid .field:nth-child(3n) { grid-column: span 2; }
.progress-summary { display: grid; grid-template-columns: repeat(4,1fr); border-block: 1px solid var(--line); }
.progress-summary article { padding: 20px; border-right: 1px solid var(--line); display: grid; gap: 6px; }
.progress-summary article:last-child { border-right: 0; }
.progress-summary span, .progress-summary small { color: var(--text-3); font-size: 10px; }
.progress-summary strong { font-size: var(--fs-4); }
.progress-section { padding: clamp(30px,5vw,56px) 0; border-bottom: 1px solid var(--line); }
.skill-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; margin-top: 18px; }
.skill-grid article { padding: 14px; border: 1px solid var(--line); }
.skill-grid article > div:first-child { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 12px; }
.achievement-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; margin-top: 18px; }
.achievement-grid article { min-height: 130px; padding: 16px; border: 1px solid var(--line); }
.achievement-grid p { margin: 8px 0 0; font-size: 12px; }
.history-list { margin-top: 18px; border-top: 1px solid var(--line); }
.history-list > div { display: grid; grid-template-columns: 1fr 80px 100px; gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 11px; }
.history-list small { color: var(--text-3); }
.diagnostic-panel { max-width: 840px; margin-top: clamp(40px,6vw,80px); padding: clamp(22px,4vw,38px); border: 1px solid var(--line); background: var(--surface); }
.diagnostic-question { margin: 0; padding: 18px 0; border: 0; border-top: 1px solid var(--line); display: grid; gap: 8px; }
.diagnostic-question legend { display: flex; gap: 12px; margin-bottom: 12px; font-weight: 720; }
.diagnostic-question legend span { color: var(--accent); font: 700 10px/1.5 var(--font-mono); }
.diagnostic-question label { min-height: 44px; display: flex; align-items: center; gap: 9px; padding: 9px 10px; border: 1px solid var(--line); }
.diagnostic-question input { width: 17px; height: 17px; min-height: 0; padding: 0; }
.diagnostic-result { margin-top: 18px; padding: 18px; border-left: 2px solid var(--accent); background: var(--accent-soft); }
.diagnostic-result strong { font-size: var(--fs-4); }
.settings-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.settings-panel { min-height: 280px; padding: clamp(20px,3vw,30px); border: 1px solid var(--line); background: var(--surface); }
.panel-title h2 { margin: 11px 0 24px; }
.profile-list { border-top: 1px solid var(--line); }
.profile-row { min-height: 68px; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.profile-row > div:first-child { display: grid; gap: 4px; }
.profile-row small { color: var(--text-3); }
.profile-row--active strong::after { content: ' · ACTIVO'; color: var(--signal); font: 700 9px/1 var(--font-mono); }
.inline-create { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-top: 16px; }
.storage-meter { display: grid; gap: 5px; margin: 20px 0; }
.storage-meter strong { font-size: var(--fs-4); }
.storage-meter small { color: var(--text-3); }
.source-note-grid { display: grid; grid-template-columns: repeat(3,1fr); border-block: 1px solid var(--line); }
.source-note-grid article { padding: 24px; border-right: 1px solid var(--line); }
.source-note-grid article:last-child { border-right: 0; }
.source-note-grid h2 { margin: 12px 0 8px; font-size: var(--fs-3); }
.source-note-grid p { margin: 0; font-size: 12px; }
.about-section { padding: clamp(44px,7vw,86px) 0; border-bottom: 1px solid var(--line); }
.tool-category { margin-top: 34px; }
.tool-category > h3 { color: var(--text-3); font: 700 11px/1 var(--font-mono); text-transform: uppercase; letter-spacing: .08em; }
.tool-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.tool-card { padding: clamp(18px,3vw,26px); border: 1px solid var(--line); background: var(--surface); }
.tool-card header { display: flex; justify-content: space-between; gap: 16px; align-items: start; }
.tool-card h3 { margin: 9px 0 0; font-size: var(--fs-3); }
.tool-card__best { padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.tool-card__best ul, .tool-card details ul { padding-left: 18px; color: var(--text-2); font-size: 12px; }
.tool-card summary { padding: 12px 0; cursor: pointer; font-weight: 700; }
.tool-card footer { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-top: 16px; }
.tool-card footer small { color: var(--text-3); }
.glossary-search { max-width: 420px; margin-bottom: 18px; }
.glossary-list { columns: 2; column-gap: 12px; }
.glossary-item { break-inside: avoid; margin-bottom: 8px; padding: 12px 14px; border: 1px solid var(--line); background: var(--surface); }
.glossary-item summary { cursor: pointer; font-weight: 720; }
.glossary-item p { margin: 10px 0 0; font-size: 12px; }
.independence-note { max-width: 900px; padding: 34px 0; }
.independence-note strong { font-size: var(--fs-3); }
.lesson-body, .lesson-prose, .lesson-shell { min-width: 0; }
.comparison-table { max-width: 100%; min-width: 0; }