:root{--paper:#f5f2ea;--surface:#fffdf8;--ink:#2b2722;--ink-soft:#6f675b;--line:#ddd6c6;--shu:#c23b2b;--shu-deep:#9e2c1f;--shu-wash:#c23b2b14;--kon:#2d4d7c;--kon-wash:#2d4d7c17;--gold:#8f7327;--code-bg:#2b2722;--code-ink:#ede8dd;--font-display:"Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "BIZ UDMincho", serif;--font-body:"Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;--font-mono:ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--paper:#1c1a16;--surface:#26231e;--ink:#e9e4d8;--ink-soft:#a59c8b;--line:#3d382f;--shu:#e56a54;--shu-deep:#f08272;--shu-wash:#e56a541f;--kon:#8fb0dc;--kon-wash:#8fb0dc1f;--gold:#d3af5e;--code-bg:#14120f;--code-ink:#ddd6c6}}*{box-sizing:border-box}html{height:100%}body{background:var(--paper);min-height:100%;color:var(--ink);font-family:var(--font-body);-webkit-font-smoothing:antialiased;margin:0;font-size:16px;line-height:1.85}h1,h2,h3{font-family:var(--font-display);margin:0;font-weight:600;line-height:1.4}p{margin:0}button{color:inherit;cursor:pointer;background:0 0;border:none;padding:0;font-family:inherit;font-size:1rem}button:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--kon);outline-offset:2px}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}.study-shell{--study-paper:#f3f0e8;--study-surface:#fffdf8;--study-surface-muted:#ebe7dc;--study-ink:#17213a;--study-ink-soft:#687080;--study-line:#d8d4ca;--study-line-strong:#b9b6af;--study-accent:#e06142;--study-accent-deep:#b9472e;--study-accent-wash:#fbe9e2;--study-navy:#16284d;--study-navy-wash:#e7ebf2;--study-success:#28735a;--study-success-wash:#e4f2eb;--study-danger:#b44037;--study-danger-wash:#f9e8e5;--study-shadow:0 24px 70px #1b233417;--study-shadow-small:0 8px 28px #1b233414;--study-radius:1.25rem;--study-font:Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;--study-mono:"SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;background:var(--study-paper);min-height:100svh;color:var(--study-ink);font-family:var(--study-font);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;grid-template-columns:minmax(14.5rem,17rem) minmax(0,1fr);font-size:1rem;line-height:1.75;display:grid;overflow-x:clip}.study-shell *,.study-shell :before,.study-shell :after{box-sizing:border-box}.study-shell button,.study-shell input,.study-shell select,.study-shell textarea{font:inherit}.study-shell button,.study-shell a{-webkit-tap-highlight-color:transparent}.study-shell button:focus-visible,.study-shell a:focus-visible,.study-shell [tabindex]:focus-visible{outline:3px solid color-mix(in srgb, var(--study-accent) 72%, white);outline-offset:3px}.study-shell h1,.study-shell h2,.study-shell h3,.study-shell p{margin:0}.study-shell h1,.study-shell h2,.study-shell h3{font-family:var(--study-font)}.study-shell .study-sidebar{background:var(--study-navy);color:#f8f5ed;border-right:1px solid #ffffff1c;flex-direction:column;height:100svh;padding:2rem 1.5rem 1.5rem;display:flex;position:sticky;top:0}.study-shell .brand-mark{color:#ffd4c6;border:1px solid #ffffff4d;border-radius:50%;place-items:center;width:2.75rem;height:2.75rem;margin-bottom:1rem;display:grid}.study-shell .brand-mark svg{width:1.35rem;height:1.35rem}.study-shell .brand-name{color:#fffdf8;letter-spacing:.12em;font-size:1.45rem;font-weight:720;line-height:1.2}.study-shell .brand-caption{color:#f8f5ed9e;letter-spacing:.14em;margin-top:.35rem;font-size:.76rem;font-weight:600;display:block}.study-shell .side-nav{gap:.35rem;margin-top:3rem;display:grid}.study-shell .side-nav button,.study-shell .side-nav a{color:#f8f5edab;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:.65rem;align-items:center;gap:.75rem;min-height:2.75rem;padding:.6rem .75rem;text-decoration:none;transition:background-color .16s,color .16s;display:flex}.study-shell .side-nav button:hover,.study-shell .side-nav a:hover,.study-shell .side-nav [aria-current=page]{color:#fffdf8;background:#ffffff17}.study-shell .side-nav [aria-current=page]:before{content:"";background:#ff896b;border-radius:50%;flex:none;width:.38rem;height:.38rem}.study-shell .side-progress{color:#f8f5edb8;background:#ffffff0d;border:1px solid #ffffff21;border-radius:.9rem;margin-top:auto;padding:1rem;font-size:.78rem}.study-shell .side-progress strong{color:#fffdf8;margin-bottom:.3rem;font-size:1.05rem;display:block}.study-shell .side-progress progress,.study-shell .session-progress progress{width:100%;height:.32rem;color:var(--study-accent);accent-color:var(--study-accent);background:#ffffff26;border:0;border-radius:999px;margin-top:.75rem;overflow:hidden}.study-shell .side-progress progress::-webkit-progress-bar{background:#ffffff26;border-radius:999px}.study-shell .session-progress progress::-webkit-progress-bar{background:#ffffff26;border-radius:999px}.study-shell .side-progress progress::-webkit-progress-value{background:var(--study-accent);border-radius:999px}.study-shell .session-progress progress::-webkit-progress-value{background:var(--study-accent);border-radius:999px}.study-shell .side-progress progress::-moz-progress-bar{background:var(--study-accent);border-radius:999px}.study-shell .session-progress progress::-moz-progress-bar{background:var(--study-accent);border-radius:999px}.study-shell .side-footer{color:#f8f5ed73;margin-top:1.25rem;font-size:.72rem}.study-shell .study-main{min-width:0}.study-shell .study-topbar{border-bottom:1px solid var(--study-line);background:color-mix(in srgb, var(--study-paper) 90%, transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);justify-content:space-between;align-items:center;gap:1rem;min-height:4.5rem;padding:.75rem clamp(1.25rem,4vw,4rem);display:flex}.study-shell .breadcrumb{min-width:0;color:var(--study-ink-soft);letter-spacing:.06em;text-overflow:ellipsis;white-space:nowrap;font-size:.78rem;font-weight:650;overflow:hidden}.study-shell .mobile-brand{color:var(--study-ink);letter-spacing:.1em;font-size:1rem;font-weight:760;display:none}.study-shell .storage-indicator{color:var(--study-ink-soft);flex:none;align-items:center;gap:.45rem;font-size:.74rem;display:inline-flex}.study-shell .storage-indicator:before{background:var(--study-success);width:.42rem;height:.42rem;box-shadow:0 0 0 .22rem color-mix(in srgb, var(--study-success) 13%, transparent);content:"";border-radius:50%}.study-shell .storage-indicator[data-status=memory]:before,.study-shell .storage-indicator[data-status=blocked]:before{background:var(--study-danger);box-shadow:0 0 0 .22rem color-mix(in srgb, var(--study-danger) 13%, transparent)}.study-shell .storage-indicator[data-status=conflict]:before{background:var(--study-accent);box-shadow:0 0 0 .22rem color-mix(in srgb, var(--study-accent) 15%, transparent)}.study-shell .study-content{width:min(100%,64rem);margin-inline:auto;padding:clamp(2.75rem,7vw,6.5rem) clamp(1.25rem,5vw,4.5rem) 6rem}.study-shell .home-heading{max-width:50rem}.study-shell .eyebrow,.study-shell .panel-label{color:var(--study-accent-deep);letter-spacing:.16em;text-transform:uppercase;font-size:.73rem;font-weight:760;line-height:1.4}.study-shell .home-heading h1,.study-shell .session-header h1{max-width:14em;color:var(--study-ink);letter-spacing:-.055em;margin-top:.85rem;font-size:clamp(2.25rem,6.5vw,5.5rem);font-weight:720;line-height:1.06}.study-shell .home-heading .lede{max-width:41rem;color:var(--study-ink-soft);margin-top:1.35rem;font-size:clamp(1rem,1.6vw,1.16rem);line-height:1.9}.study-shell .resume-panel,.study-shell .feature-panel,.study-shell .reading-card,.study-shell .question-card,.study-shell .finish-panel,.study-shell .settings-panel{border:1px solid var(--study-line);border-radius:var(--study-radius);background:var(--study-surface);box-shadow:var(--study-shadow);margin-top:clamp(2.5rem,6vw,5.5rem);position:relative;overflow:hidden}.study-shell .resume-panel,.study-shell .feature-panel{grid-template-columns:minmax(0,1fr) minmax(13rem,34%);align-items:center;gap:clamp(1.5rem,5vw,4rem);min-height:22rem;padding:clamp(1.75rem,5vw,4rem);display:grid}.study-shell .resume-panel:before,.study-shell .feature-panel:before{background:var(--study-accent);content:"";width:.3rem;position:absolute;inset:0 auto 0 0}.study-shell .resume-panel h2,.study-shell .feature-panel h2,.study-shell .finish-panel h2{max-width:17em;color:var(--study-ink);letter-spacing:-.035em;margin-top:.75rem;font-size:clamp(1.7rem,3.2vw,2.7rem);font-weight:720;line-height:1.25}.study-shell .panel-description{max-width:38rem;color:var(--study-ink-soft);margin-top:1rem}.study-shell .panel-actions,.study-shell .session-actions{flex-wrap:wrap;align-items:center;gap:.75rem;margin-top:1.75rem;display:flex}.study-shell .btn{cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:.5rem;min-height:2.75rem;padding:.65rem 1.2rem;font-size:.9rem;font-weight:720;line-height:1.25;text-decoration:none;transition:transform .15s,background-color .15s,border-color .15s,color .15s,box-shadow .15s;display:inline-flex}.study-shell .btn:hover:not(:disabled){transform:translateY(-1px)}.study-shell .btn:active:not(:disabled){transform:translateY(0)}.study-shell .btn:disabled{cursor:not-allowed;opacity:.52}.study-shell .btn-primary{background:var(--study-accent-deep);color:#fff;box-shadow:0 8px 20px color-mix(in srgb, var(--study-accent) 23%, transparent)}.study-shell .btn-primary:hover:not(:disabled){background:color-mix(in srgb, var(--study-accent-deep) 85%, black)}.study-shell .btn-secondary{border-color:var(--study-line-strong);background:var(--study-surface);color:var(--study-ink)}.study-shell .btn-secondary:hover:not(:disabled){border-color:var(--study-ink);background:var(--study-surface-muted)}.study-shell .btn-text{color:var(--study-ink-soft);background:0 0;padding-inline:.55rem}.study-shell .btn-text:hover:not(:disabled){color:var(--study-ink)}.study-shell .orbital-art{aspect-ratio:1;background:radial-gradient(circle, var(--study-accent-wash) 0 13%, transparent 14% 100%);pointer-events:none;border-radius:50%;justify-self:center;width:min(100%,16rem);position:relative}.study-shell .orbit-ring{border:1px solid color-mix(in srgb, var(--study-navy) 32%, transparent);border-radius:50%;position:absolute;inset:12%}.study-shell .orbit-ring:nth-child(2){border-color:color-mix(in srgb, var(--study-accent) 45%, transparent);inset:27%}.study-shell .orbit-ring:first-child{transform:rotate(-21deg)scaleY(.58)}.study-shell .orbit-core{background:var(--study-accent);color:#fff;box-shadow:0 0 0 .8rem var(--study-accent-wash);border-radius:50%;place-items:center;display:grid;position:absolute;inset:40%}.study-shell .orbit-dot{background:var(--study-navy);width:.65rem;height:.65rem;box-shadow:0 0 0 .35rem var(--study-navy-wash);border-radius:50%;position:absolute;top:15%;left:50%;transform:translate(-50%)}.study-shell .section-heading{border-bottom:1px solid var(--study-line);justify-content:space-between;align-items:end;gap:1rem;margin-top:clamp(3.25rem,8vw,7rem);padding-bottom:.85rem;display:flex}.study-shell .section-heading h2{letter-spacing:-.025em;font-size:clamp(1.35rem,2.5vw,1.9rem);font-weight:720}.study-shell .section-heading p,.study-shell .section-heading>span{color:var(--study-ink-soft);font-size:.78rem}.study-shell .checkpoint-list{margin-top:.4rem;display:grid}.study-shell .checkpoint-card{border-bottom:1px solid var(--study-line);grid-template-columns:3.2rem minmax(0,1fr) auto;align-items:center;gap:1rem;min-height:6.5rem;padding:1.35rem 0;display:grid}.study-shell button.checkpoint-card,.study-shell a.checkpoint-card{width:100%;color:inherit;text-align:left;cursor:pointer;background:0 0;border-top:0;border-left:0;border-right:0;text-decoration:none}.study-shell button.checkpoint-card:hover .checkpoint-info h3,.study-shell a.checkpoint-card:hover .checkpoint-info h3,.study-shell button.checkpoint-card:hover .checkpoint-info>strong,.study-shell a.checkpoint-card:hover .checkpoint-info>strong{color:var(--study-accent-deep)}.study-shell .checkpoint-number{color:var(--study-accent-deep);font-family:var(--study-mono);letter-spacing:.06em;font-size:.76rem;font-weight:720}.study-shell .checkpoint-info h3,.study-shell .checkpoint-info>strong{font-size:1.05rem;font-weight:720;line-height:1.4;transition:color .15s;display:block}.study-shell .checkpoint-info p,.study-shell .checkpoint-info>span{color:var(--study-ink-soft);margin-top:.25rem;font-size:.86rem;display:block}.study-shell .checkpoint-status{min-width:5.5rem;color:var(--study-ink-soft);text-align:right;justify-content:flex-end;align-items:center;gap:.45rem;font-size:.76rem;font-weight:680;display:inline-flex}.study-shell .checkpoint-card:disabled{cursor:not-allowed}.study-shell .checkpoint-card:disabled .checkpoint-info,.study-shell .checkpoint-card:disabled .checkpoint-status{opacity:.58}.study-shell .session-header{gap:.35rem;display:grid}.study-shell .session-header h1{max-width:18em;font-size:clamp(2rem,5vw,4rem)}.study-shell .session-meta{color:var(--study-ink-soft);flex-wrap:wrap;gap:.6rem 1.25rem;margin-top:1rem;font-size:.82rem;display:flex}.study-shell progress.session-progress{background:var(--study-line);width:100%;height:.42rem;color:var(--study-accent);accent-color:var(--study-accent);border:0;border-radius:999px;margin-top:2rem;display:block;overflow:hidden}.study-shell progress.session-progress::-webkit-progress-bar{background:var(--study-line)}.study-shell progress.session-progress::-webkit-progress-value{background:var(--study-accent);border-radius:999px}.study-shell progress.session-progress::-moz-progress-bar{background:var(--study-accent);border-radius:999px}.study-shell .reading-card,.study-shell .question-card,.study-shell .finish-panel,.study-shell .settings-panel{padding:clamp(1.4rem,4.5vw,3.75rem)}.study-shell .reading-title{border-bottom:1px solid var(--study-line);letter-spacing:-.025em;padding-bottom:1.1rem;font-size:clamp(1.4rem,3vw,2rem);font-weight:720}.study-shell .reading-content{max-width:47rem;margin-top:1.5rem}.study-shell .reading-content>*+*{margin-top:1.4rem}.study-shell .reading-content figure{margin-inline:0}.study-shell .reading-content figcaption{color:var(--study-ink-soft);margin-bottom:.5rem;font-size:.78rem;font-weight:650}.study-shell .reading-content h3{font-size:1rem;line-height:1.6}.study-shell .reading-content>p{color:color-mix(in srgb, var(--study-ink) 90%, var(--study-ink-soft));font-size:clamp(.98rem,1.4vw,1.08rem);line-height:2}.study-shell .reading-content pre{color:#f2f4f8;font-family:var(--study-mono);tab-size:2;background:#111a2e;border-radius:.85rem;padding:1.2rem 1.35rem;font-size:.86rem;line-height:1.75;overflow-x:auto}.study-shell .reading-content code{background:var(--study-navy-wash);color:var(--study-navy);font-family:var(--study-mono);border-radius:.3rem;padding:.12em .35em;font-size:.88em}.study-shell .reading-content pre code{color:inherit;font-size:inherit;background:0 0;padding:0}.study-shell .reading-content ul{gap:.65rem;padding-left:1.4rem;display:grid}.study-shell .reading-content li::marker{color:var(--study-accent)}.study-shell .reading-content aside{border-left:3px solid var(--study-accent);background:var(--study-accent-wash);color:var(--study-ink);padding:1rem 1.15rem;font-size:.9rem}.study-shell .reading-content aside .eyebrow{margin-bottom:.35rem;display:block}.study-shell .question-card h2{letter-spacing:-.025em;max-width:38rem;font-size:clamp(1.35rem,2.7vw,2rem);font-weight:720;line-height:1.5}.study-shell .question-card>.eyebrow+h2{margin-top:.65rem}.study-shell .choice-list{gap:.75rem;margin-top:2rem;display:grid}.study-shell .answer-choice{border:1px solid var(--study-line);background:var(--study-surface);width:100%;min-height:4.25rem;color:var(--study-ink);text-align:left;cursor:pointer;border-radius:.9rem;grid-template-columns:2.15rem minmax(0,1fr) auto;align-items:center;gap:.9rem;padding:.85rem 1rem;line-height:1.55;transition:border-color .15s,background-color .15s,box-shadow .15s,transform .15s,opacity .15s;display:grid}.study-shell .answer-choice:not(:disabled):hover{border-color:var(--study-navy);box-shadow:var(--study-shadow-small);transform:translateY(-1px)}.study-shell .answer-choice:disabled{cursor:default}.study-shell .choice-letter{border:1px solid var(--study-line-strong);width:2.15rem;height:2.15rem;color:var(--study-ink-soft);font-family:var(--study-mono);border-radius:50%;place-items:center;font-size:.76rem;font-weight:720;display:grid}.study-shell .choice-copy{min-width:0;font-size:.92rem}.study-shell .choice-result{color:var(--study-ink-soft);font-size:.76rem;font-weight:760}.study-shell .answer-choice[data-state=correct]{border-color:var(--study-success);background:var(--study-success-wash)}.study-shell .answer-choice[data-state=correct] .choice-letter{border-color:var(--study-success);background:var(--study-success);color:#fff}.study-shell .answer-choice[data-state=correct] .choice-result{color:var(--study-success)}.study-shell .answer-choice[data-state=wrong]{border-color:var(--study-danger);background:var(--study-danger-wash)}.study-shell .answer-choice[data-state=wrong] .choice-letter{border-color:var(--study-danger);color:var(--study-danger)}.study-shell .answer-choice[data-state=wrong] .choice-result{color:var(--study-danger)}.study-shell .answer-choice[data-state=dim]{opacity:.5}.study-shell .feedback-panel{border:1px solid var(--study-line);background:var(--study-surface-muted);border-radius:.9rem;margin-top:1.5rem;padding:1.2rem 1.35rem}.study-shell .feedback-panel[data-correct=true]{border-color:color-mix(in srgb, var(--study-success) 42%, var(--study-line));background:var(--study-success-wash)}.study-shell .feedback-panel[data-correct=false]{border-color:color-mix(in srgb, var(--study-danger) 42%, var(--study-line));background:var(--study-danger-wash)}.study-shell .feedback-panel strong{margin-bottom:.35rem;display:block}.study-shell .feedback-panel h2{margin-bottom:.4rem;font-size:1.05rem;line-height:1.5}.study-shell .feedback-panel p{font-size:.9rem}.study-shell .finish-panel{text-align:center}.study-shell .finish-symbol{background:var(--study-accent-wash);width:4.25rem;height:4.25rem;color:var(--study-accent-deep);border-radius:50%;place-items:center;margin-inline:auto;font-size:1.6rem;display:grid}.study-shell .finish-panel h1,.study-shell .finish-panel h2{margin-inline:auto}.study-shell .finish-panel h1{letter-spacing:-.045em;max-width:16em;margin-top:.8rem;font-size:clamp(2rem,5vw,3.6rem);font-weight:720;line-height:1.12}.study-shell .finish-panel>p{max-width:35rem;color:var(--study-ink-soft);margin:.9rem auto 0}.study-shell .finish-panel .panel-actions{justify-content:center}.study-shell .summary-grid{text-align:left;grid-template-columns:repeat(auto-fit,minmax(min(100%,14rem),1fr));gap:.75rem;margin-top:2rem;display:grid}.study-shell .summary-grid>*{background:var(--study-surface-muted);border-radius:.75rem;min-width:0;padding:1rem}.study-shell .summary-grid strong{font-size:1.15rem;display:block}.study-shell .summary-grid span,.study-shell .summary-grid p{color:var(--study-ink-soft);font-size:.75rem}.study-shell .status-banner{border:1px solid var(--study-line);background:var(--study-surface);border-radius:.8rem;grid-template-columns:minmax(0,1fr);gap:.45rem;margin-bottom:1.25rem;padding:.9rem 1rem;font-size:.84rem;display:grid}.study-shell .status-banner .panel-actions{margin-top:.65rem}.study-shell .status-banner[data-kind=error]{border-color:color-mix(in srgb, var(--study-danger) 48%, var(--study-line));background:var(--study-danger-wash)}.study-shell .status-banner[data-kind=conflict]{border-color:color-mix(in srgb, var(--study-accent) 52%, var(--study-line));background:var(--study-accent-wash)}.study-shell .settings-panel h2{font-size:clamp(1.35rem,2.8vw,2rem)}.study-shell .settings-panel>*+*{margin-top:1rem}.study-shell .glossary-term{color:var(--study-navy);cursor:help;display:inline;position:relative}.study-shell .glossary-term>button{min-height:1.5em;color:inherit;font:inherit;text-align:inherit;cursor:help;background:0 0;border:0;border-bottom:1px dotted;border-radius:0;padding:0;display:inline}.study-shell .glossary-tooltip{border:1px solid var(--study-line);background:var(--study-surface);width:auto;box-shadow:var(--study-shadow-small);color:var(--study-ink);border-radius:.65rem;margin:.5rem 0;padding:.75rem .85rem;font-size:.78rem;line-height:1.65;display:none;position:static}.study-shell .glossary-term[data-open=true] .glossary-tooltip,.study-shell .glossary-tooltip strong{display:block}@media (prefers-color-scheme:dark){.study-shell{--study-paper:#141821;--study-surface:#1d2330;--study-surface-muted:#252c39;--study-ink:#f3efe5;--study-ink-soft:#aab0bd;--study-line:#353d4b;--study-line-strong:#596170;--study-accent:#f27a5d;--study-accent-deep:#ff9a81;--study-accent-wash:#3a2828;--study-navy:#b9c9ea;--study-navy-wash:#283246;--study-success:#69c59c;--study-success-wash:#20362f;--study-danger:#f18a80;--study-danger-wash:#402927;--study-shadow:0 24px 70px #00000047;--study-shadow-small:0 8px 28px #00000038;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}.study-shell .study-sidebar{background:#0e1524}.study-shell .reading-content pre{background:#0c1019}.study-shell .btn-primary{color:#141821}}@media (width<=47.99rem){.study-shell{display:block}.study-shell .study-sidebar{border:0;border-bottom:1px solid var(--study-line);background:var(--study-paper);height:auto;color:var(--study-ink);padding:.5rem 1rem;display:block;position:static}.study-shell .study-sidebar .brand-mark,.study-shell .study-sidebar .brand-name,.study-shell .side-progress,.study-shell .side-footer{display:none}.study-shell .side-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:.25rem;margin:0}.study-shell .side-nav button{color:var(--study-ink-soft);justify-content:center;gap:.4rem;padding:.5rem .35rem;font-size:.78rem}.study-shell .side-nav svg{flex-shrink:0;width:1rem;height:1rem}.study-shell .side-nav button:hover,.study-shell .side-nav [aria-current=page]{background:var(--study-navy-wash);color:var(--study-ink)}.study-shell .side-nav [aria-current=page]:before{display:none}.study-shell .study-topbar{z-index:20;min-height:4rem;padding-inline:1rem;position:sticky;top:0}.study-shell .mobile-brand{display:block}.study-shell .breadcrumb{display:none}.study-shell .study-content{padding:2.75rem max(1rem, env(safe-area-inset-left)) 4rem}.study-shell .resume-panel,.study-shell .feature-panel{grid-template-columns:1fr;min-height:auto}.study-shell .orbital-art{grid-row:1;width:min(58vw,13rem)}.study-shell .summary-grid{grid-template-columns:1fr}}@media (width<=35rem){.study-shell .home-heading h1,.study-shell .session-header h1{letter-spacing:-.04em}.study-shell .section-heading{flex-direction:column;align-items:flex-start}.study-shell .checkpoint-card{grid-template-columns:2.25rem minmax(0,1fr);gap:.7rem}.study-shell .checkpoint-status{text-align:left;grid-column:2;justify-content:flex-start;min-width:0}.study-shell .panel-actions,.study-shell .session-actions{flex-direction:column;align-items:stretch}.study-shell .panel-actions .btn,.study-shell .session-actions .btn{width:100%}.study-shell .answer-choice{grid-template-columns:2.15rem minmax(0,1fr);align-items:start}.study-shell .choice-result{grid-column:2}.study-shell .status-banner{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){.study-shell *,.study-shell :before,.study-shell :after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}