:root{color-scheme:light;--bg: #f5f1e8;--surface: rgba(255, 255, 255, .84);--surface-strong: #fffdf8;--ink: #17212b;--muted: #5d6873;--line: #d7d0c2;--accent: #c95f34;--accent-soft: #f4d8ca;--success: #2f8f64;--danger: #b54747;--court: #f6c48f;--court-line: #8d4f22;font-family:Segoe UI,Helvetica Neue,sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:radial-gradient(circle at top,rgba(244,216,202,.8),transparent 30%),linear-gradient(180deg,#fcfaf6 0%,var(--bg) 100%);min-height:100vh}a{color:inherit;text-decoration:none}button,textarea{font:inherit}.app-shell{width:min(1100px,calc(100% - 24px));margin:0 auto;padding:14px 0 32px}.app-shell--lesson{width:min(100%,calc(100% - 12px));max-width:760px;padding-top:8px;padding-bottom:8px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:4px 0 14px;position:sticky;top:0;z-index:30;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#fcfaf6e6}.topbar h1,.section-title,.lesson-title{margin:0;font-family:Georgia,Times New Roman,serif;letter-spacing:-.03em}.eyebrow{margin:0 0 6px;text-transform:uppercase;letter-spacing:.16em;font-size:.75rem;color:var(--accent)}.nav,.cta-row,.pill-row,.choice-list,.feedback-actions,.lesson-meta,.stat-row{display:flex;flex-wrap:wrap;gap:12px}.nav a{padding:8px 12px;border-radius:999px;color:var(--muted);font-size:.95rem}.nav a.active{background:var(--surface);color:var(--ink);border:1px solid var(--line)}.nav-auth-status{padding:8px 6px;font-size:.95rem;font-weight:700;color:var(--ink)}.nav-auth-link{padding:8px 6px;font-size:.95rem;font-weight:700;color:var(--ink);border-radius:999px}.nav-auth-link.active{background:var(--surface);border:1px solid var(--line)}.nav-auth-button{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-size:.95rem;font-weight:700;cursor:pointer}.auth-card{max-width:560px}.auth-form{display:grid;gap:14px;margin:18px 0 0}.auth-field{display:grid;gap:6px;font-weight:700;color:var(--ink)}.auth-field input{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px 14px;font:inherit;background:#fffdf8eb;color:var(--ink)}.auth-error{margin:0;color:#a23b2f;font-weight:700}.page,.hero,.grid,.lesson-layout,.progress-layout,.progress-dashboard,.dashboard-hero,.home-focus-grid{display:grid;gap:20px}.page--lesson{min-height:calc(100vh - 16px);overflow:hidden}.hero{grid-template-columns:1.25fr .95fr;align-items:stretch}.home-stack{display:grid;gap:18px}.card{background:var(--surface);border:1px solid rgba(215,208,194,.8);border-radius:24px;padding:24px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 18px 50px #17212b0f}.diagram-editor{width:100%;min-height:320px;border-radius:18px;border:1px solid var(--line);background:var(--surface-strong);padding:16px;resize:vertical;font-family:Consolas,SFMono-Regular,monospace;font-size:.95rem;line-height:1.5;color:var(--ink)}.hero-copy p,.muted{color:var(--muted)}.primary-button,.secondary-button,.choice-button{border-radius:16px;border:1px solid transparent;padding:12px 16px;cursor:pointer}.primary-button{background:var(--accent);color:#fff}.secondary-button{background:var(--surface-strong);border-color:var(--line)}.choice-button{width:100%;text-align:left;background:var(--surface-strong);border-color:var(--line)}.choice-button.selected{border-color:var(--accent);background:var(--accent-soft)}.choice-button.correct{border-color:var(--success);background:#2f8f641f}.choice-button.incorrect{border-color:var(--danger);background:#b547471a}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.brand-lockup h1{font-size:1.3rem}.brand-lockup .eyebrow{margin-bottom:2px}.pill{display:inline-flex;align-items:center;border-radius:999px;background:var(--surface-strong);border:1px solid var(--line);padding:8px 12px;color:var(--muted)}.lesson-layout{grid-template-columns:minmax(0,720px);justify-content:center;align-items:start}.lesson-layout-compact{grid-template-columns:minmax(0,1fr)}.lesson-session-card{display:grid;gap:10px;min-height:calc(100vh - 24px);padding:14px;overflow:hidden}.lesson-session-header,.lesson-session-kicker,.lesson-session-tools,.lesson-question-header,.lesson-mini-stats,.lesson-secondary-strip,.dashboard-hero-cards,.lesson-node-row{display:flex;flex-wrap:wrap;gap:10px}.lesson-session-header,.lesson-question-header{justify-content:space-between;align-items:start}.lesson-session-header-minimal{align-items:center;justify-content:flex-start;flex-wrap:nowrap;gap:14px}.lesson-question-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:start}.lesson-session-tools,.lesson-mini-stats{justify-content:flex-end}.lesson-shell-pill{display:inline-flex;align-items:center;border-radius:999px;background:#fffdf8eb;border:1px solid rgba(215,208,194,.9);padding:8px 12px;color:var(--ink);font-weight:700}.lesson-shell-back{padding-inline:14px}.lesson-icon-button{width:42px;height:42px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;border:1px solid var(--line);background:#fffdf8f2;color:var(--ink);cursor:pointer;font-size:1.2rem;box-shadow:0 8px 18px #17212b0f}.lesson-hint-button{margin-top:2px}.lesson-progress-shell{display:grid;gap:6px}.lesson-progress-shell--compact{flex:1 1 auto;max-width:420px;min-width:140px;align-self:center}.lesson-progress-bar{height:12px;background:#d7d0c280}.court-wrap{overflow:hidden;padding:18px}.prompt{margin:0;font-size:1.15rem;line-height:1.5}.lesson-prompt-top{font-size:1.35rem;font-weight:700;line-height:1.35;text-align:center;margin-bottom:16px}.lesson-prompt-compact{margin-bottom:2px;text-align:center;font-size:clamp(1.05rem,2.8vw,1.32rem)}.lesson-stage{position:relative;display:flex;align-items:center;justify-content:center;flex:1;min-height:0}.lesson-board-shell{display:grid;place-items:center;width:100%;height:100%;padding:0}.lesson-board-shell svg{width:min(100%,620px);height:auto;max-height:min(72vh,620px)}.lesson-choice-list{gap:10px}.lesson-choice-button{padding:14px 16px;border-radius:18px;font-weight:600}.lesson-outcome{border-radius:20px;padding:14px;border:1px solid var(--line);background:#fffdf8f2;box-shadow:0 10px 24px #17212b14;display:grid;gap:12px}.lesson-outcome-copy{display:grid;gap:8px}.lesson-outcome-copy p,.lesson-outcome-note{margin:0}.lesson-outcome-badge{display:inline-flex;width:fit-content;align-items:center;border-radius:999px;padding:6px 10px;font-size:.85rem;font-weight:700;background:#d7d0c266}.lesson-outcome-badge.correct{background:#2f8f6429;color:var(--success)}.lesson-outcome-badge.incorrect{background:#b547471f;color:var(--danger)}.lesson-outcome.correct{border-color:#2f8f6447}.lesson-outcome.incorrect{border-color:#b5474742}.lesson-feedback-modal{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;align-items:start;justify-items:center;padding:6px 16px 16px;background:linear-gradient(180deg,rgba(23,33,43,.05),rgba(23,33,43,.02) 120px,transparent 240px);pointer-events:none}.lesson-feedback-modal .lesson-outcome{width:min(100%,520px);pointer-events:auto}.lesson-outcome-actions{display:flex;flex-wrap:wrap;gap:10px}.lesson-hint-panel{display:grid;gap:10px;padding-top:2px}.lesson-hint-panel p{margin:0}.lesson-hint-actions{display:flex;flex-wrap:wrap;gap:10px}.lesson-support-card{display:grid;gap:16px}.lesson-board-actions{justify-content:center;margin-bottom:8px}.lesson-meta-button{padding:8px 12px}.unit-hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:center;padding:20px 22px;border-radius:24px;background:linear-gradient(180deg,#ffd788,#ffd07a);border:1px solid rgba(201,95,52,.16);box-shadow:0 18px 42px #c95f341f}.dashboard-hero{grid-template-columns:minmax(0,1.2fr) minmax(0,.95fr);align-items:stretch}.dashboard-hero--compact{padding:22px}.dashboard-hero-copy{display:grid;gap:12px;align-content:start}.dashboard-hero-copy h2,.dashboard-stat-card strong{margin:0}.dashboard-hero-copy p{margin:0;color:var(--muted)}.dashboard-hero-cards{align-content:stretch}.dashboard-stat-card{flex:1 1 180px;min-height:116px;display:grid;gap:8px;align-content:start;padding:16px;border-radius:22px;background:#fffdf8e0;border:1px solid rgba(215,208,194,.9)}.dashboard-stat-card.accent{background:linear-gradient(180deg,#ffd788,#ffd07a);border-color:#c95f342e}.dashboard-stat-label{color:var(--muted);font-size:.9rem;font-weight:600}.dashboard-stat-card strong{font-size:clamp(1.7rem,4vw,2.3rem);line-height:1}.dashboard-stat-meta{color:var(--muted);font-size:.92rem}.home-focus-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.home-focus-card{display:grid;gap:12px}.home-focus-card h3,.progress-lesson-item h3{margin:0}.unit-hero-main,.unit-section,.chapter-list{display:grid;gap:12px}.unit-hero-main h2,.unit-strip h3,.chapter-title-row h4{margin:0}.unit-hero-main p,.unit-strip p,.chapter-copy{margin:0;color:var(--muted)}.unit-badge,.unit-chip,.home-meta-pill,.chapter-badge{display:inline-flex;align-items:center;width:fit-content;border-radius:12px;padding:6px 10px;font-size:.82rem;font-weight:700}.unit-badge,.unit-chip{background:#c983002e;color:#8b5700}.home-meta-pill{background:#ffffffc7;color:var(--ink)}.unit-hero-actions{display:grid;gap:10px;justify-items:end}.chapter-timeline{display:grid;gap:22px}.track-section{display:grid;gap:18px}.reference-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.reference-card{margin-left:0}.reference-card--target{outline:3px solid rgba(214,119,60,.35);outline-offset:3px;scroll-margin-top:96px}.reference-card:before{display:none}.reference-index-card{display:grid;gap:12px}.nav-toggle{display:none;width:44px;height:44px;border-radius:999px;border:1px solid var(--line);background:#fffdf8f5;align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;box-shadow:0 8px 18px #17212b0f}.nav-toggle span{display:block;width:16px;height:2px;border-radius:999px;background:var(--ink)}.reference-copy{display:grid;gap:8px}.inline-link{color:var(--accent);font-weight:700;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:2px}.unit-strip{gap:6px}.chapter-list{position:relative;gap:14px}.chapter-list--compact:before{display:none}.chapter-list:before{content:"";position:absolute;top:0;bottom:0;left:24px;width:4px;border-radius:999px;background:#f8d597e6}.chapter-card{position:relative;margin-left:42px;padding:18px 18px 16px;border-radius:22px;background:var(--surface-strong);border:1px solid rgba(215,208,194,.95);box-shadow:0 12px 30px #17212b0f}.curriculum-unit-card{gap:14px}.lesson-node-row{align-items:center;gap:12px}.lesson-node{position:relative;width:46px;height:46px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;border:1px solid rgba(215,208,194,.95);background:var(--surface-strong);color:var(--muted);font-weight:800;box-shadow:0 8px 20px #17212b0d}.lesson-node.open{border-color:#c95f3442;color:var(--accent)}.lesson-node.live{background:linear-gradient(180deg,#ffd788,#ffd07a);border-color:#c95f3442;color:#8b5700}.lesson-node.done{background:#2f8f6424;border-color:#2f8f644d;color:var(--success)}.lesson-node.locked{opacity:.55;pointer-events:none}.lesson-node:not(:last-child):after{content:"";position:absolute;left:calc(100% + 5px);top:50%;width:10px;height:4px;border-radius:999px;background:#d7d0c2cc;transform:translateY(-50%)}.chapter-card--compact{margin-left:0;padding:12px 14px}.chapter-card--current{border-color:#c95f345c;box-shadow:0 18px 36px #c95f341f;scroll-margin-top:96px}.chapter-card--link{display:grid;gap:10px;transition:transform .14s ease,box-shadow .14s ease,border-color .14s ease}.chapter-card--link:hover{transform:translateY(-1px);border-color:#c95f344d;box-shadow:0 16px 30px #17212b14}.chapter-card--compact:before{display:none}.chapter-card:before{content:"";position:absolute;left:-30px;top:24px;width:16px;height:16px;border-radius:999px;background:#f4d59d;border:4px solid #fff6e4}.chapter-header,.chapter-title-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.chapter-title-row--compact{align-items:center}.chapter-inline-meta{color:var(--muted);font-size:.92rem;white-space:nowrap}.chapter-badge{background:#d7edbe;color:#375a1c}.chapter-status{display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:34px;border-radius:999px;font-weight:700}.chapter-status.done{background:#2f8f6424;color:var(--success)}.chapter-status.live{background:#c95f341f;color:var(--accent)}.chapter-status.locked{background:#5c70831f;color:var(--muted)}.chapter-link{color:var(--accent);font-weight:700}.chapter-link.is-disabled{color:var(--muted)}.chapter-progress{width:100%;height:10px;border-radius:999px;background:#d7d0c2a6;overflow:hidden}.chapter-progress>span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2f8f64,#2f8f64)}.choice-list{flex-direction:column}.feedback{border-radius:18px;padding:16px;border:1px solid var(--line);background:#fffdf8b3}.progress-header{display:grid;gap:8px}.progress-label{color:var(--muted);font-size:.92rem}.glossary-term-wrap{position:relative;display:inline-flex;align-items:center}.glossary-term{border:none;background:#1f8f6b24;color:#145f4a;border-bottom:1px dashed rgba(20,95,74,.45);padding:0 2px;margin:0 1px;cursor:pointer;border-radius:4px}.glossary-term.active{background:#1f8f6b38}.glossary-tooltip{position:absolute;left:50%;bottom:calc(100% + 8px);transform:translate(-50%);min-width:180px;max-width:240px;padding:10px 12px;border-radius:12px;background:#17212bf2;color:#fff;font-size:.86rem;line-height:1.4;z-index:2;box-shadow:0 10px 24px #17212b33}.feedback.correct{border-color:#2f8f6466}.feedback.incorrect{border-color:#b5474759}.progress-bar{width:100%;height:12px;border-radius:999px;background:#d7d0c2a6;overflow:hidden}.progress-bar>span{display:block;height:100%;background:linear-gradient(90deg,#d77a44,#c95f34);border-radius:inherit}.progress-layout{grid-template-columns:1fr 1fr}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:12px 0;border-bottom:1px solid var(--line)}.empty-state{padding:20px;border-radius:18px;background:#fffdf8e6;border:1px dashed var(--line);color:var(--muted)}.review-list{display:grid;gap:16px}.progress-lesson-list{display:grid;gap:14px}.progress-lesson-item{display:grid;gap:12px}.concept-stack{display:grid;gap:14px}.concept-row,.concept-row-strong{display:grid;grid-template-columns:minmax(120px,1fr) minmax(120px,2fr) auto;gap:12px;align-items:center}.concept-row-strong{padding:14px 0;border-bottom:1px solid var(--line)}.concept-meter,.mini-meter{width:100%;height:10px;border-radius:999px;background:#d7d0c2a6;overflow:hidden}.concept-meter>span,.mini-meter>span{display:block;height:100%;background:linear-gradient(90deg,#c95f34,#e39a4b);border-radius:inherit}.review-item{border:1px solid var(--line);border-radius:18px;padding:18px;background:#fffdf8d9}.pill-alert{border-color:#b5474759;background:#b547471a;color:var(--danger)}.review-cta{display:grid;gap:12px}.court-arrow{vector-effect:non-scaling-stroke}.court-arrow-highlight{stroke-dasharray:12 10;animation:court-arrow-flow 1.6s linear infinite}.court-arrow-animated{stroke-dasharray:12 10;animation:court-arrow-flow 1.2s linear infinite}.court-focus-ring{transform-box:fill-box;transform-origin:center;animation:court-focus-pulse 1.4s ease-in-out infinite}.dev-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.play-library-layout{display:grid;grid-template-columns:minmax(320px,420px) minmax(0,1fr);gap:20px;align-items:start}.play-family-chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.play-family-chip{display:grid;gap:2px;min-width:150px;padding:12px 14px;border-radius:18px;border:1px solid var(--line);background:var(--surface-strong);text-align:left}.play-family-chip span{font-size:.98rem;font-weight:700}.play-family-chip small{color:var(--muted);font-size:.8rem}.play-family-chip.active{border-color:#c95f346b;background:#f4d8ca6b}.play-library-groups,.play-family-stack,.play-preview-stack{display:grid;gap:16px}.play-family-block,.play-list{display:grid;gap:10px}.play-list-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:18px;border:1px solid var(--line);background:var(--surface-strong)}.play-list-item.active{border-color:#c95f3459;background:#f4d8ca59}.play-list-copy{display:grid;gap:4px}.play-list-copy span{color:var(--muted);font-size:.9rem}.play-preview-card{position:sticky;top:12px}.play-beat-strip{display:flex;flex-wrap:wrap;gap:10px}.play-beat-button.active{border-color:var(--accent);background:var(--accent-soft)}.play-frame-meta{margin-bottom:12px}.play-frame-stage{position:relative}.play-nav-button{min-width:48px;min-height:48px;padding:10px 14px;font-size:1.2rem}.play-nav-button--overlay{position:absolute;top:50%;z-index:2;transform:translateY(-50%);width:52px;height:52px;min-width:52px;min-height:52px;border-radius:999px;background:#fffdf8f0;box-shadow:0 10px 24px #17212b1f}.play-nav-button--left{left:12px}.play-nav-button--right{right:12px}.play-nav-button:disabled{opacity:.45;cursor:not-allowed}.halfcourt-editor-wrapper{position:relative;outline:none}.halfcourt-editor-wrapper svg:first-child{display:block;width:100%}.halfcourt-editor-overlay{position:absolute;top:0;left:0;width:100%;height:100%;overflow:visible}.editor-toolbar{display:grid;gap:8px;padding:10px 12px;background:var(--surface-strong);border:1px solid var(--line);border-radius:14px;margin-bottom:10px}.editor-toolbar-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.editor-tool-group{display:flex;gap:4px}.editor-tool-btn{padding:6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-size:.85rem;cursor:pointer;font-family:monospace;transition:background .1s,border-color .1s}.editor-tool-btn:hover:not(:disabled){background:var(--accent-soft);border-color:var(--accent)}.editor-tool-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.editor-tool-btn:disabled{opacity:.45;cursor:not-allowed}.editor-frame-nav{display:flex;align-items:center;gap:8px;flex:1;justify-content:center}.editor-frame-label{font-size:.88rem;font-weight:600;min-width:90px;text-align:center}.editor-frame-label small{font-weight:400;color:var(--muted)}.editor-nav-btn{padding:5px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);cursor:pointer;font-size:1rem}.editor-nav-btn:disabled{opacity:.4;cursor:not-allowed}.editor-action-group{display:flex;gap:6px;margin-left:auto}.editor-undo-btn,.editor-discard-btn{padding:6px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer;font-size:.85rem}.editor-undo-btn:disabled,.editor-discard-btn:disabled{opacity:.4;cursor:not-allowed}.editor-save-btn{padding:6px 16px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer;font-size:.85rem;font-weight:600;transition:background .15s,color .15s,border-color .15s}.editor-save-btn.dirty{background:var(--success);color:#fff;border-color:var(--success)}.editor-save-btn:disabled{opacity:.5;cursor:not-allowed}.editor-suboption-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.editor-suboption-label{font-size:.8rem;font-weight:600;color:var(--muted)}.editor-suboption-btn{padding:4px 10px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);cursor:pointer;font-size:.8rem}.editor-suboption-btn.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.editor-purpose-select{padding:4px 8px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);font-size:.85rem}.editor-reused-notice{padding:8px 12px;border-radius:8px;background:#f4d8ca80;border:1px solid rgba(201,95,52,.25);color:var(--accent);font-size:.8rem}.editor-error-notice{padding:8px 12px;border-radius:8px;background:#b547471a;border:1px solid rgba(181,71,71,.3);color:var(--danger);font-size:.8rem}.editor-enter-btn{font-size:.85rem;padding:6px 14px;white-space:nowrap}.play-preview-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:4px}.play-preview-title-row .lesson-title{margin:0}.editor-screen-picker{background:var(--surface-strong);border:1px solid var(--line);border-radius:10px;padding:8px;display:grid;gap:4px;box-shadow:0 4px 16px #00000026;font-family:Segoe UI,Helvetica Neue,sans-serif}.editor-screen-picker-title{font-size:.8rem;font-weight:700;color:var(--muted);margin-bottom:2px}.editor-screen-picker-btn{padding:5px 10px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);cursor:pointer;font-size:.8rem;text-align:left}.editor-screen-picker-btn:hover{background:var(--accent-soft);border-color:var(--accent)}.editor-screen-picker-cancel{padding:4px 10px;border:1px solid transparent;border-radius:6px;background:transparent;color:var(--muted);cursor:pointer;font-size:.75rem;text-align:left}@keyframes court-arrow-flow{0%{stroke-dashoffset:0}to{stroke-dashoffset:-22}}@keyframes court-focus-pulse{0%,to{transform:scale(.96);opacity:.75}50%{transform:scale(1.06);opacity:1}}@media (max-width: 860px){.hero,.grid,.lesson-layout,.progress-layout,.progress-dashboard,.dashboard-hero,.home-focus-grid,.dev-preview-grid,.play-library-layout,.concept-row,.concept-row-strong{grid-template-columns:1fr}.topbar{align-items:center;flex-wrap:wrap;gap:10px;padding:8px 0 12px}.brand-lockup{flex:1 1 auto;min-width:0}.nav-toggle{display:inline-flex}.nav{display:none;width:100%;padding-top:4px}.nav--open{display:flex}.nav a,.nav-auth-link,.nav-auth-status,.nav-auth-button{width:100%;justify-content:flex-start;text-align:left}.app-shell{width:min(100%,calc(100% - 20px));padding:12px 0 32px}.app-shell--lesson{width:min(100%,calc(100% - 8px));padding-top:4px;padding-bottom:4px}.card{border-radius:20px;padding:16px}.lesson-prompt-top{font-size:1.18rem;text-align:left}.lesson-session-card{min-height:calc(100vh - 8px);padding:12px}.lesson-session-header,.lesson-question-header{align-items:start;flex-direction:column}.lesson-session-header-minimal{align-items:center;flex-direction:row;flex-wrap:nowrap}.lesson-progress-shell--compact{min-width:0;max-width:none}.lesson-question-row{grid-template-columns:minmax(0,1fr) auto;gap:10px}.lesson-board-shell svg{width:100%;max-height:min(66vh,560px)}.lesson-outcome-actions{display:grid}.lesson-feedback-modal{padding:4px 10px 10px;align-items:start}.dashboard-hero-cards{display:grid}.unit-hero{grid-template-columns:1fr;padding:18px}.unit-hero-actions{justify-items:start;grid-template-columns:repeat(2,auto);align-items:center}.chapter-card{margin-left:26px;padding:16px}.chapter-card:before{left:-22px}.chapter-list:before{left:16px}.chapter-header,.chapter-title-row{align-items:start;flex-direction:column}.chapter-title-row--compact{gap:4px}.lesson-node-row{gap:10px;overflow-x:auto;padding-bottom:4px}.play-preview-card{position:static}.play-nav-button--overlay{width:46px;height:46px;min-width:46px;min-height:46px}.play-nav-button--left{left:6px}.play-nav-button--right{right:6px}}