:root{--bg:#f7f8fb;--panel:#ffffff;--border:#e6e8ee;--text:#12131a;--muted:#656a7a;--primary:#2563eb;--primary-dark:#1d4ed8;--btn-bg:#2563eb;--success:#16a34a;--danger:#dc2626;--radius:12px;--shadow:0 1px 2px rgba(16,19,26,0.04),0 8px 24px rgba(16,19,26,0.06);--header-h:57px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.55}body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}.site-footer,.site-header{flex-shrink:0}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.site-main{flex:1 0 auto;display:flex;flex-direction:column}.site-main>*{width:100%}.container{max-width:1080px;margin:0 auto;padding:0 20px}.narrow{max-width:760px}.container-wide{max-width:1720px}.page-pad{padding-top:40px;padding-bottom:40px}.site-header{background:var(--panel);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:20}.site-header .inner{max-width:1080px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-weight:800;font-size:1.15rem;letter-spacing:-.02em;color:var(--text)}.brand span{color:var(--primary)}.nav-wrap{gap:16px}.nav,.nav-wrap{display:flex;align-items:center}.nav{gap:18px}.nav-actions{display:flex;align-items:center;gap:12px}.view-role{border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);padding:6px 8px;font-size:.85rem;cursor:pointer}.view-role:disabled{opacity:.6;cursor:wait}.theme-toggle{border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);padding:6px 10px;font-size:.85rem;cursor:pointer;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}.theme-toggle:hover{background:var(--tint-hover)}.studio-block{border:1px solid var(--border);border-radius:10px;background:var(--panel);padding:12px 14px;margin:4px 0}.studio-block-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}.studio-stages{list-style:none;margin:0;padding:0;display:grid;grid-gap:6px;gap:6px}.studio-stage{display:flex;align-items:baseline;gap:10px}.studio-stage-dot{flex:none;width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:.8rem;border:1px solid var(--border);color:var(--muted)}.studio-stage-done .studio-stage-dot{background:#16a34a;border-color:#16a34a;color:#fff}.studio-stage-running .studio-stage-dot{border-color:#2563eb;color:#2563eb;animation:studio-pulse 1.2s infinite}.studio-stage-blocked .studio-stage-dot,.studio-stage-error .studio-stage-dot{background:#dc2626;border-color:#dc2626;color:#fff}.studio-stage-pending{color:var(--muted)}@keyframes studio-pulse{0%,to{opacity:1}50%{opacity:.4}}.studio-howto{display:grid;grid-gap:4px;gap:4px;margin:0 0 4px;padding-left:20px;color:var(--muted);font-size:.92rem}.studio-howto strong{color:var(--text)}.studio-saved{border:1px solid var(--border);border-left:3px solid #16a34a;border-radius:10px;padding:12px 14px;margin-bottom:12px;background:var(--bg)}.lesson-figure{margin:18px 0}.lesson-figure img{max-width:100%;height:auto;border-radius:10px;display:block}.lesson-figure figcaption{margin-top:6px;font-size:.8rem;color:var(--muted);line-height:1.4}.lesson-figure figcaption a{color:inherit}.studio-home{display:flex;flex-direction:column;flex:1 0 auto}.studio-home-center{flex:1 1;display:flex;flex-direction:column;justify-content:center}.studio-hero{text-align:center;padding:36px 0 20px}.studio-hero h1{margin:0 0 4px;font-size:2rem;letter-spacing:-.02em}.studio-hero-sub{color:var(--muted);margin:0 0 20px}.studio-hero-row{position:relative;max-width:620px;margin:0 auto}.studio-hero-input{width:100%;font-size:1.05rem;padding:14px 92px 14px 18px;border:1px solid var(--border);border-radius:14px;background:var(--panel);color:var(--text);box-shadow:var(--shadow)}.studio-hero-input:focus{outline:2px solid var(--focus-ring);border-color:var(--primary)}.studio-hero-btn{position:absolute;right:6px;top:50%;transform:translateY(-50%);padding:9px 18px;border-radius:10px;font-size:.95rem}.studio-shortcuts{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:4px 0 8px}.studio-view-block{position:relative;padding:2px 0;border-radius:8px}.studio-view-block-active{background:var(--panel);border:1px solid var(--border);padding:10px 12px;margin:6px 0}.studio-view-row{display:flex;align-items:flex-start;gap:10px}.studio-view-content{flex:1 1;min-width:0}.studio-view-content h2,.studio-view-content h3{margin:14px 0 6px}.studio-view-content ol,.studio-view-content p,.studio-view-content ul{margin:6px 0}.studio-view-dim{opacity:.55}.studio-block-controls{opacity:0;transition:opacity .12s;flex:none}.studio-view-block:focus-within .studio-block-controls,.studio-view-block:hover .studio-block-controls{opacity:1}@media (hover:none){.studio-block-controls{opacity:1}}.studio-proposal{border:1px solid var(--border);border-left:3px solid #2563eb;border-radius:8px;padding:8px 12px;margin-top:8px;background:var(--bg)}.intake-answers{display:grid;grid-gap:10px;gap:10px}.intake-answer .intake-answer-q{font-size:.82rem;color:var(--muted);margin-bottom:3px}.video-figure{margin:0}.video-credit{margin-top:6px;font-size:.8rem;color:var(--muted);line-height:1.4}.video-credit a{color:inherit}.studio-scope{border:1px solid var(--border);border-radius:10px;padding:12px 14px;margin-bottom:12px;background:var(--panel);min-height:84px}.outline-units{display:grid;grid-gap:5px;gap:5px;margin-top:12px}.outline-units>details.disclosure{margin:0}.outline-units>details.disclosure>summary{padding:7px 14px}.outline-units>details.disclosure>.disclosure-body{padding:0 14px 12px}@media (min-width:1000px){.outline-units{grid-template-columns:1fr 1fr}.outline-units>details.disclosure[open]{grid-column:1/-1}.outline-units>details.disclosure:not([open])>summary{height:100%}}.unit-title{flex:1 1;min-width:0}.unit-count{display:inline-flex;align-items:center;gap:5px;flex-shrink:0;font-size:.8rem;font-weight:600;color:var(--accent-text);background:var(--tint-info);border-radius:999px;padding:3px 10px}.unit-count svg{width:12px;height:12px}.sidekick-body .studio-chat-log{align-content:start}.studio-workbench-main>.console-section:first-child,.studio-workbench-plan>.console-section:first-child,.studio-workbench-work>.console-section:first-child{margin-top:0}.check-grid{display:grid;grid-gap:8px;gap:8px;grid-template-columns:1fr}@media (min-width:700px){.check-grid{grid-template-columns:1fr 1fr}}@media (min-width:1200px){.check-grid{grid-template-columns:1fr 1fr 1fr}}.check-item{text-align:left;border:1px solid var(--border);border-radius:10px;background:var(--panel);padding:9px 11px;cursor:pointer;color:var(--text);font:inherit;display:block;width:100%}.check-item:hover{background:var(--tint-hover)}.check-item-head{display:flex;align-items:center;gap:7px;font-weight:600;font-size:.88rem}.check-item-dot{color:var(--muted)}.check-item-done .check-item-dot{color:var(--success)}.check-item-snippet{margin:3px 0 0;font-size:.82rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.check-item-editing{grid-column:1/-1;cursor:auto}.check-item-active{border-color:var(--primary)}.studio-workspace-card{min-height:460px;display:flex;flex-direction:column}.studio-workspace-card>*{min-width:0}.studio-q-progress{margin:0 0 4px;font-size:.82rem}.studio-q-ask{margin:0 0 12px;font-size:1.25rem;line-height:1.35}.studio-q-input{width:100%;resize:vertical}.btn-link{background:none;border:none;padding:0;color:var(--primary);cursor:pointer;font:inherit;font-size:inherit;text-decoration:underline}.studio-workbench{display:block}@media (min-width:1000px){.studio-workbench{display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-gap:20px;gap:20px;align-items:start}.studio-workbench-side{position:-webkit-sticky;position:sticky;top:calc(var(--header-h) + 40px);height:calc(100vh - var(--header-h) - 56px);height:calc(100dvh - var(--header-h) - 56px)}.studio-workbench-side .sidekick,.studio-workbench-side .sidekick-body{height:100%}.sidekick-fab{display:none}.studio-workbench-trio{grid-template-columns:minmax(230px,260px) minmax(0,1fr) minmax(260px,320px);grid-template-areas:"plan work coach"}.studio-workbench-trio>.studio-workbench-plan{grid-area:plan;min-width:0}.studio-workbench-trio>.studio-workbench-work{grid-area:work;min-width:0;display:flex;flex-direction:column}.studio-workbench-trio>.studio-workbench-coach{grid-area:coach;min-width:0}.studio-workbench-trio .check-grid{grid-template-columns:1fr}.studio-workbench-trio>.studio-workbench-coach .sidekick{min-height:420px}.studio-workbench-trio>.studio-workbench-coach .sidekick,.studio-workbench-trio>.studio-workbench-coach .sidekick-body{height:100%}}@media (min-width:1400px){body:has(.studio-workbench-trio){height:100dvh;overflow:hidden}body:has(.studio-workbench-trio) .site-footer{display:none}body:has(.studio-workbench-trio) .site-main{min-height:0;flex:1 1 auto}.site-main>.container:has(>.studio-workbench-trio){display:flex;flex-direction:column;flex:1 1;min-height:0;padding-bottom:20px}.studio-workbench-trio{grid-template-columns:300px minmax(0,1fr) 380px;align-items:stretch;flex:1 1;min-height:0}.studio-workbench-trio>.studio-workbench-plan{display:flex;flex-direction:column;min-height:0}.studio-workbench-trio>.studio-workbench-plan>.console-section{flex:1 1;min-height:0;display:flex;flex-direction:column;margin-top:0}.studio-workbench-trio>.studio-workbench-plan>.console-section>.panel{flex:1 1;min-height:0;overflow-y:auto;overflow-x:hidden}.studio-workbench-trio>.studio-workbench-work{min-height:0}.studio-workbench-trio>.studio-workbench-work>.console-section{flex:1 1;min-height:0;display:flex;flex-direction:column;margin-top:0}.studio-workbench-trio>.studio-workbench-work .studio-workspace-card{flex:1 1;min-height:0;overflow-y:auto;overflow-x:hidden}.studio-workbench-trio>.studio-workbench-coach{display:flex;flex-direction:column;min-height:0}}@media (max-width:999px){.sidekick-fab{position:fixed;right:16px;bottom:16px;z-index:40;border:1px solid var(--border);border-radius:999px;background:var(--primary);color:#fff;font-weight:600;padding:12px 18px;box-shadow:var(--shadow);cursor:pointer}.sidekick-body{display:none}.sidekick-open .sidekick-body{display:block;position:fixed;z-index:40;left:12px;right:12px;bottom:72px;max-width:480px;margin-left:auto;height:70vh;height:70dvh;border-radius:14px;box-shadow:var(--shadow)}}.sidekick-body>.panel.studio-chat{display:flex;flex-direction:column;height:100%;min-height:0}.sidekick-body .studio-chat-log{flex:1 1;min-height:0;max-height:none;overflow-y:auto}.section-banner{display:flex;align-items:center;gap:10px;margin:30px 0 12px}.section-banner-icon{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:9px;flex-shrink:0;background:var(--tint-info);color:var(--accent-text)}.section-banner-icon svg{width:19px;height:19px}.section-banner-label{font-weight:800;font-size:1.25rem;letter-spacing:-.01em}.section-banner-bar{flex:1 1;height:4px;border-radius:999px;opacity:.85;background:linear-gradient(90deg,#ef4444,#f59e0b,#eab308,#22c55e,#3b82f6,#8b5cf6)}.prose-page h1{margin-bottom:4px}.prose-page h2{margin:26px 0 8px;font-size:1.15rem}.prose-page li,.prose-page p{line-height:1.6}.prose-page ul{padding-left:22px;margin:8px 0}.studio-duplicate{border-radius:10px;padding:12px 14px;margin-top:12px;border:1px solid var(--border);background:var(--tint-info);color:var(--text);font-size:.95rem;text-align:left}.studio-hero .studio-duplicate{max-width:620px;margin-left:auto;margin-right:auto}.studio-fit{border-radius:10px;padding:10px 12px;margin-top:10px;border:1px solid var(--warn-border);background:var(--tint-warn-soft);color:var(--warn-text)}.studio-fit-impossible{border-color:var(--err-border);background:var(--tint-err);color:var(--err-text)}.studio-fit p{font-size:.92rem}.coach-card{border:1px solid var(--border);border-left:3px solid #2563eb;border-radius:10px;padding:12px 14px;margin-top:12px;background:var(--bg);text-align:left}.coach-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.coach-summary{margin:8px 0 10px}.coach-subhead{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-top:10px}.coach-checklist{list-style:none;margin:0;padding:0;display:grid;grid-gap:6px;gap:6px}.coach-item{display:grid;grid-template-columns:auto 1fr;grid-gap:8px;gap:8px;align-items:baseline;font-size:.92rem}.coach-status{font-size:.7rem;text-transform:uppercase;letter-spacing:.03em;white-space:nowrap;border-radius:999px;padding:2px 8px;border:1px solid var(--border);color:var(--muted)}.coach-solid .coach-status{background:var(--ok-chip-bg);border-color:var(--ok-chip-border);color:var(--ok-chip-text)}.coach-practice .coach-status{background:var(--tint-warn);border-color:var(--warn-border);color:var(--warn-text)}.coach-steps{margin:6px 0 0;padding-left:20px;display:grid;grid-gap:4px;gap:4px;font-size:.92rem}.coach-teacher-note{margin:10px 0 0;padding:8px 10px;border-radius:8px;background:var(--panel);border:1px solid var(--border);font-size:.9rem}.coach-foot{margin:10px 0 0;font-size:.78rem}.studio-chat{display:grid;grid-gap:12px;gap:12px}.studio-chat-log{display:grid;grid-gap:10px;gap:10px;max-height:420px;overflow-y:auto;padding-right:4px}.studio-chat-turn{display:grid;grid-gap:2px;gap:2px}.studio-chat-turn p{margin:0;white-space:pre-wrap}.studio-chat-who{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.studio-chat-assistant p{background:var(--bg);border:1px solid var(--border);justify-self:start}.studio-chat-assistant p,.studio-chat-user p{border-radius:10px;padding:8px 11px;max-width:46em}.studio-chat-user p{background:#2563eb;color:#fff;justify-self:end}.studio-chat-user .studio-chat-who{justify-self:end}.studio-chat-input{display:grid;grid-gap:8px;gap:8px}.studio-suggestion{border:1px solid var(--border);border-left:3px solid #2563eb;border-radius:10px;padding:10px 12px;background:var(--bg)}.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:8px 11px;cursor:pointer;font-size:1.05rem;line-height:1;color:var(--text)}.site-footer{border-top:1px solid var(--border);background:var(--panel);color:var(--muted);font-size:.9rem;padding:28px 20px 20px}.footer-inner{max-width:1080px;margin:0 auto;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}.footer-brand p{margin:6px 0 0;max-width:340px}.footer-links{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.footer-links a{color:var(--muted)}.footer-links a:hover{color:var(--primary)}.footer-copy{max-width:1080px;margin:18px auto 0;padding-top:14px;border-top:1px solid var(--border);font-size:.8rem}.curriculum-toggle{display:none;width:100%;align-items:center;justify-content:space-between;background:none;border:none;border-bottom:1px solid var(--border);padding:12px 4px;font-weight:700;font-size:1rem;color:var(--text);cursor:pointer}@media (max-width:820px){.curriculum-toggle{display:flex}.curriculum:not(.open) .curriculum-body{display:none}.curriculum:not(.open){padding-bottom:8px}.curriculum-body{padding-top:10px}}details.disclosure{padding:0}details.disclosure>summary{cursor:pointer;padding:15px 18px;font-weight:700;list-style:none;display:flex;align-items:center;gap:10px;-webkit-user-select:none;-moz-user-select:none;user-select:none}details.disclosure>summary::-webkit-details-marker{display:none}details.disclosure>summary:before{content:"+";color:var(--primary);font-size:1.2rem;line-height:1;width:18px;text-align:center;flex-shrink:0}details.disclosure[open]>summary:before{content:"−"}details.disclosure>.disclosure-body{padding:2px 18px 18px}.btn{display:inline-flex;align-items:center;gap:8px;background:var(--btn-bg);color:#fff;border:none;padding:10px 16px;border-radius:10px;font-weight:600;font-size:.95rem;cursor:pointer;transition:background .15s ease}.btn:hover{background:var(--primary-dark);text-decoration:none}.btn.secondary{background:var(--tint-info);color:var(--accent-text)}.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}.btn:disabled{opacity:.6;cursor:default}.grid{display:grid;grid-gap:20px;gap:20px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.card{display:flex;flex-direction:column}.card .body{flex:1 1;display:flex;flex-direction:column}.card .body>.btn{align-self:flex-start}.card-eyebrow{height:24px;overflow:hidden}.card-eyebrow .badge{display:inline-block;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-title{margin:8px 0 0;min-height:calc(2 * 1.4em);line-height:1.4;font-size:1.1rem}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card .body{padding:18px}.card h3{margin:0 0 6px;font-size:1.1rem}.muted{color:var(--muted)}.badge{display:inline-block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--accent-text);background:var(--tint-info);padding:3px 8px;border-radius:999px}.badge-draft{color:var(--warn-text);background:var(--tint-warn)}.form-note{font-size:.85rem;color:var(--muted);white-space:nowrap}.form-note-ok{color:var(--success)}.form-note-err{color:var(--danger);white-space:normal}.hero{padding:64px 0 40px}.hero h1{font-size:2.4rem;line-height:1.1;letter-spacing:-.03em;margin:0 0 14px}.hero p{font-size:1.15rem;color:var(--muted);max-width:620px}.section{padding:48px 0}.section h2{font-size:1.6rem;letter-spacing:-.02em;margin:0 0 6px}.section .lead{color:var(--muted);max-width:640px;margin:0 0 24px}.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary)}.features{display:grid;grid-gap:18px;gap:18px;grid-template-columns:repeat(3,1fr)}.feature{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.feature .ico{font-size:1.6rem}.feature h3{margin:10px 0 6px;font-size:1.1rem}.feature p{margin:0;color:var(--muted);font-size:.95rem}.steps{display:grid;grid-gap:18px;gap:18px;grid-template-columns:repeat(3,1fr)}.step{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px}.step-num{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:999px;background:var(--primary);color:#fff;font-weight:700}.step h3{margin:12px 0 6px;font-size:1.05rem}.step p{margin:0;color:var(--muted);font-size:.95rem}.band{background:linear-gradient(180deg,var(--tint-info),var(--bg));border-top:1px solid var(--border);border-bottom:1px solid var(--border)}@media (max-width:820px){.features,.steps{grid-template-columns:1fr}}.progress{height:8px;background:var(--track);border-radius:999px;overflow:hidden}.progress>span{display:block;height:100%;background:var(--success)}.learn{display:grid;grid-template-columns:320px 1fr;grid-gap:0;gap:0}.curriculum{background:var(--panel);border-right:1px solid var(--border);padding:20px}@media (min-width:821px){.site-header .inner{height:var(--header-h);padding-top:0;padding-bottom:0}.curriculum{position:-webkit-sticky;position:sticky;top:var(--header-h);align-self:start;max-height:calc(100vh - var(--header-h));max-height:calc(100dvh - var(--header-h));overflow-y:auto}.lesson-scroll{min-width:0}}.curriculum h2{font-size:1rem;margin:0 0 4px}.section-title{font-weight:700;margin:18px 0 6px;font-size:.9rem}.lesson-link{display:flex;align-items:center;gap:8px;padding:7px 8px;border-radius:8px;color:var(--text);font-size:.92rem}.lesson-link:hover{background:var(--tint-hover);text-decoration:none}.lesson-link.active{background:var(--tint-info);color:var(--accent-text);font-weight:600}.lesson-link .check{color:var(--success)}.lesson-link .dot{color:var(--border)}.lesson-body{padding:32px 40px;max-width:820px;width:100%;margin:0 auto}.lesson-banner{display:block;max-width:100%;height:auto;margin:16px 0 8px;border-radius:8px}.video-frame{position:relative;padding-top:56.25%;border-radius:var(--radius);overflow:hidden;background:#000}.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.prose h1,.prose h2,.prose h3{line-height:1.2}.prose img{max-width:100%;height:auto!important;width:auto;display:block;margin:16px auto;border-radius:8px}.prose{overflow-wrap:break-word}.prose :is(table,pre){max-width:100%;overflow-x:auto;display:block}.quiz .question{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:14px}.quiz .option{display:block;padding:10px 12px;border:1px solid var(--border);border-radius:10px;margin:8px 0;cursor:pointer}.quiz .option.correct{border-color:var(--success);background:var(--tint-ok)}.quiz .option.wrong{border-color:var(--danger);background:var(--tint-err)}.quiz .explanation{font-size:.9rem;color:var(--muted);margin-top:8px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}.panel h2{font-size:1.15rem;margin:0 0 4px}.stats{display:grid;grid-gap:14px;gap:14px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin:18px 0}.stat{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow)}.stat-value{font-size:1.6rem;font-weight:800;letter-spacing:-.02em}.stat-label{color:var(--muted);font-size:.85rem}.table-wrap{overflow-x:auto}.table{width:100%;border-collapse:collapse;font-size:.93rem}.table th{text-align:left;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700;padding:8px 10px}.table td,.table th{border-bottom:1px solid var(--border)}.table td{padding:10px;vertical-align:top}.table tr:last-child td{border-bottom:none}.pill{display:inline-block;font-size:.75rem;font-weight:700;padding:2px 9px;border-radius:999px;text-transform:capitalize}.pill-ok{background:var(--tint-ok);color:var(--success)}.pill-warn{background:var(--tint-err);color:var(--danger)}.pill-dim{background:var(--tint-dim);color:var(--muted)}.progress-cell{display:flex;align-items:center;gap:8px}.quiz-chips{gap:6px}.console-title,.quiz-chips{display:flex;flex-wrap:wrap}.console-title{align-items:center;gap:10px;margin:0 0 4px}.console-title h1{margin:0}.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:14px}.crumbs a{text-decoration:underline;text-underline-offset:2px}.console-section{margin-top:28px}.console-section>h2{font-size:1.25rem;margin:0 0 12px}.form-grid{display:grid;grid-gap:12px;gap:12px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.field label{display:block;font-size:.82rem;font-weight:600;margin-bottom:4px}.field .hint{font-size:.78rem;color:var(--muted);margin-top:3px}.input,select.input{width:100%;padding:9px 11px;border:1px solid var(--border);border-radius:10px;font-size:.95rem;background:var(--panel);color:var(--text);font-family:inherit}.input:focus{outline:2px solid var(--focus-ring);border-color:var(--primary)}.btn.small{padding:7px 12px;font-size:.85rem}.btn.danger{background:var(--tint-err);color:var(--danger)}.inline-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}body,html{overflow-x:hidden}body,html,iframe,img,video{max-width:100%}@media (max-width:820px){.learn{grid-template-columns:1fr}.curriculum{position:static;max-height:none;border-right:none;border-bottom:1px solid var(--border)}.lesson-body{padding:24px 20px}}@media (max-width:640px){.site-header .inner{padding:12px 16px;gap:10px;position:relative}.nav-toggle{display:inline-flex}.nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--panel);border-bottom:1px solid var(--border);box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:2px;padding:8px 16px 14px}.nav.open{display:flex}.nav a{padding:12px 10px;border-radius:8px;font-size:1rem}.nav a:hover{background:var(--tint-hover);text-decoration:none}.input,select.input,textarea.input{font-size:16px}.container{padding:0 16px}.hero{padding:40px 0 28px}.hero h1{font-size:1.8rem}.hero p{font-size:1.05rem}.grid{grid-template-columns:1fr;gap:16px}.btn{padding:12px 18px}.lesson-link{padding:10px 8px}}.tutor-bubble{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom, 0px));z-index:30;width:56px;height:56px;border-radius:999px;border:none;background:var(--primary);color:#fff;font-size:1.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px rgba(16,19,26,.22)}.tutor-bubble:hover{background:var(--primary-dark)}.tutor{position:fixed;top:0;right:0;bottom:0;width:min(400px,100%);z-index:40;background:var(--panel);border-left:1px solid var(--border);box-shadow:var(--shadow);display:flex;flex-direction:column;transform:translateX(105%);transition:transform .2s ease;visibility:hidden}.tutor.open{transform:none;visibility:visible}.tutor-head{padding:12px 14px;border-bottom:1px solid var(--border);font-weight:700;display:flex;justify-content:space-between;align-items:center}.tutor-messages{flex:1 1;min-height:0;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px}.tutor-msg{max-width:92%;padding:9px 12px;border-radius:var(--radius);font-size:.92rem;line-height:1.45;white-space:pre-wrap;overflow-wrap:break-word}.tutor-msg.user{align-self:flex-end;background:var(--tint-info);color:var(--accent-text)}.tutor-msg.assistant{align-self:flex-start;background:var(--tint-hover);border:1px solid var(--border)}.tutor-typing{opacity:.6;animation:tutor-pulse 1.2s ease-in-out infinite}@keyframes tutor-pulse{0%,to{opacity:.35}50%{opacity:.9}}.tutor-empty{display:flex;flex-direction:column;gap:10px}.tutor-chips{display:flex;flex-wrap:wrap;gap:8px}.tutor-chip{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:999px;padding:9px 12px;font-size:.85rem;cursor:pointer}.tutor-chip:hover{border-color:var(--primary);color:var(--primary-dark)}.tutor-input{display:flex;gap:8px;padding:12px 14px 6px;border-top:1px solid var(--border)}.tutor-input .input{flex:1 1}.tutor-note{font-size:.75rem;color:var(--muted);padding:0 14px calc(10px + env(safe-area-inset-bottom, 0px));margin:0}@media (min-width:1200px){.learn{grid-template-columns:320px minmax(0,1fr) auto}.tutor{position:-webkit-sticky;position:sticky;top:var(--header-h);align-self:start;z-index:auto;width:380px;height:calc(100vh - var(--header-h));height:calc(100dvh - var(--header-h));box-shadow:none;transform:none;transition:none;visibility:visible;display:none}.tutor.open{display:flex}}[data-theme=dark]{color-scheme:dark;--bg:#101319;--panel:#181c24;--border:#2a3040;--text:#e7eaf2;--muted:#98a0b3;--primary:#3b82f6;--primary-dark:#1d4ed8;--accent-text:#9db9f7;--shadow:0 1px 2px rgba(0,0,0,0.4),0 8px 24px rgba(0,0,0,0.35);--tint-info:#1b2440;--tint-hover:#1f2530;--tint-dim:#1e2330;--tint-ok:#11261a;--tint-err:#321a1c;--tint-warn:#33270f;--tint-warn-soft:#2a2210;--warn-text:#eec269;--warn-border:#7a5c1d;--err-text:#f1a2a2;--err-border:#7a3030;--ok-chip-bg:#143622;--ok-chip-border:#245c38;--ok-chip-text:#7fd8a1;--success:#34d399;--danger:#f87171;--track:#2a3040;--focus-ring:#1e40af}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--bg:#101319;--panel:#181c24;--border:#2a3040;--text:#e7eaf2;--muted:#98a0b3;--primary:#3b82f6;--primary-dark:#1d4ed8;--accent-text:#9db9f7;--shadow:0 1px 2px rgba(0,0,0,0.4),0 8px 24px rgba(0,0,0,0.35);--tint-info:#1b2440;--tint-hover:#1f2530;--tint-dim:#1e2330;--tint-ok:#11261a;--tint-err:#321a1c;--tint-warn:#33270f;--tint-warn-soft:#2a2210;--warn-text:#eec269;--warn-border:#7a5c1d;--err-text:#f1a2a2;--err-border:#7a3030;--ok-chip-bg:#143622;--ok-chip-border:#245c38;--ok-chip-text:#7fd8a1;--success:#34d399;--danger:#f87171;--track:#2a3040;--focus-ring:#1e40af}}