:root{--bg-washi-light:#f6f1e7;--bg-surface-light:#fcf9f3;--bg-elevated-light:#fff;--ink-primary-light:#181614;--ink-secondary-light:#474139;--ink-muted-light:#756c61;--shu-light:#c53b34;--shu-hover-light:#9e2923;--oxford-light:#182b49;--oxford-deep-light:#101e35;--sage-light:#355843;--gold-light:#b38428;--sakura-light:#f2c3cd;--border-light:#18161421;--bg-washi-dark:#0d1522;--bg-surface-dark:#142033;--bg-elevated-dark:#1a2940;--ink-primary-dark:#f4eee2;--ink-secondary-dark:#cfc6b6;--ink-muted-dark:#9aa5b6;--shu-dark:#e0524a;--shu-hover-dark:#f0655d;--oxford-dark:#284573;--oxford-deep-dark:#09101b;--sage-dark:#4f8564;--gold-dark:#dfb04f;--sakura-dark:#f2c3cd73;--border-dark:#f4eee224;--bg-washi:var(--bg-washi-light);--bg-surface:var(--bg-surface-light);--bg-elevated:var(--bg-elevated-light);--ink-primary:var(--ink-primary-light);--ink-secondary:var(--ink-secondary-light);--ink-muted:var(--ink-muted-light);--shu:var(--shu-light);--shu-hover:var(--shu-hover-light);--oxford:var(--oxford-light);--oxford-deep:var(--oxford-deep-light);--sage:var(--sage-light);--gold:var(--gold-light);--sakura:var(--sakura-light);--border:var(--border-light)}@media (prefers-color-scheme:dark){:root{--bg-washi:var(--bg-washi-dark);--bg-surface:var(--bg-surface-dark);--bg-elevated:var(--bg-elevated-dark);--ink-primary:var(--ink-primary-dark);--ink-secondary:var(--ink-secondary-dark);--ink-muted:var(--ink-muted-dark);--shu:var(--shu-dark);--shu-hover:var(--shu-hover-dark);--oxford:var(--oxford-dark);--oxford-deep:var(--oxford-deep-dark);--sage:var(--sage-dark);--gold:var(--gold-dark);--sakura:var(--sakura-dark);--border:var(--border-dark)}}@supports (color:light-dark(white, black)){:root{--bg-washi:light-dark(var(--bg-washi-light),var(--bg-washi-dark));--bg-surface:light-dark(var(--bg-surface-light),var(--bg-surface-dark));--bg-elevated:light-dark(var(--bg-elevated-light),var(--bg-elevated-dark));--ink-primary:light-dark(var(--ink-primary-light),var(--ink-primary-dark));--ink-secondary:light-dark(var(--ink-secondary-light),var(--ink-secondary-dark));--ink-muted:light-dark(var(--ink-muted-light),var(--ink-muted-dark));--shu:light-dark(var(--shu-light),var(--shu-dark));--shu-hover:light-dark(var(--shu-hover-light),var(--shu-hover-dark));--oxford:light-dark(var(--oxford-light),var(--oxford-dark));--oxford-deep:light-dark(var(--oxford-deep-light),var(--oxford-deep-dark));--sage:light-dark(var(--sage-light),var(--sage-dark));--gold:light-dark(var(--gold-light),var(--gold-dark));--sakura:light-dark(var(--sakura-light),var(--sakura-dark));--border:light-dark(var(--border-light),var(--border-dark))}}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;accent-color:var(--shu);--radius-sm:10px;--radius-md:16px;--radius-lg:22px;--shadow-card:0 14px 34px -14px #10182840;--font-display:var(--font-en-serif), var(--font-jp-mincho), Georgia, serif;--font-mincho:var(--font-jp-mincho), "Hiragino Mincho ProN", "Yu Mincho", serif;--font-body:var(--font-sans), system-ui, -apple-system, sans-serif}:root[data-theme=light]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg-washi:var(--bg-washi-light);--bg-surface:var(--bg-surface-light);--bg-elevated:var(--bg-elevated-light);--ink-primary:var(--ink-primary-light);--ink-secondary:var(--ink-secondary-light);--ink-muted:var(--ink-muted-light);--shu:var(--shu-light);--shu-hover:var(--shu-hover-light);--oxford:var(--oxford-light);--oxford-deep:var(--oxford-deep-light);--sage:var(--sage-light);--gold:var(--gold-light);--sakura:var(--sakura-light);--border:var(--border-light)}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg-washi:var(--bg-washi-dark);--bg-surface:var(--bg-surface-dark);--bg-elevated:var(--bg-elevated-dark);--ink-primary:var(--ink-primary-dark);--ink-secondary:var(--ink-secondary-dark);--ink-muted:var(--ink-muted-dark);--shu:var(--shu-dark);--shu-hover:var(--shu-hover-dark);--oxford:var(--oxford-dark);--oxford-deep:var(--oxford-deep-dark);--sage:var(--sage-dark);--gold:var(--gold-dark);--sakura:var(--sakura-dark);--border:var(--border-dark)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);color:var(--ink-primary);background-color:var(--bg-washi);background-image:linear-gradient(90deg,#b3842809 1px,#0000 1px),linear-gradient(#182b4909 1px,#0000 1px);background-size:36px 36px;min-block-size:100dvh;line-height:1.6;overflow-x:clip}.app-shell{flex-direction:column;min-block-size:100dvh;display:flex}main{flex:1}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer;background:0 0;border:none}img{max-inline-size:100%;display:block}input,textarea,select{font:inherit;color:var(--ink-primary);background:var(--bg-elevated);border:1.5px solid var(--border);border-radius:var(--radius-sm);inline-size:100%;min-inline-size:0;padding:10px 13px}input:focus,textarea:focus,select:focus{outline:2px solid var(--shu);outline-offset:1px;border-color:var(--shu)}h1,h2,h3,h4{font-family:var(--font-display);letter-spacing:.01em;line-height:1.18}h2{font-size:clamp(1.85rem,3.5vw,2.75rem);font-weight:700}.container{inline-size:100%;max-inline-size:1220px;margin-inline:auto;padding-inline:clamp(14px,3vw,26px)}.muted-copy{color:var(--ink-muted)}.small{font-size:.83rem}.eyebrow{font-family:var(--font-mincho);letter-spacing:.14em;color:var(--shu);align-items:center;gap:10px;margin-block-end:10px;font-size:.82rem;font-weight:700;display:inline-flex}.eyebrow:before{content:"";background:currentColor;block-size:2px;inline-size:24px}.eyebrow-mini{font-family:var(--font-mincho);letter-spacing:.14em;color:var(--gold);font-size:.7rem;font-weight:700;display:block}.btn{white-space:nowrap;border-radius:999px;justify-content:center;align-items:safe center;gap:8px;padding:11px 20px;font-size:.92rem;font-weight:700;transition:transform .15s,background-color .15s,box-shadow .15s;display:inline-flex;position:relative}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-shu{background:var(--shu);color:#fff;box-shadow:0 8px 20px -8px var(--shu)}.btn-shu:hover:not(:disabled){background:var(--shu-hover)}.btn-oxford{background:var(--oxford);color:#fff}.btn-oxford:hover:not(:disabled){filter:brightness(1.12)}.btn-ghost{border:1.5px solid var(--border);background:var(--bg-surface);color:var(--ink-primary)}.btn-ghost:hover:not(:disabled){border-color:var(--shu);color:var(--shu)}.btn-danger{border:1.5px solid var(--shu);color:var(--shu);background:0 0}.btn-danger:hover:not(:disabled){background:var(--shu);color:#fff}.btn-sm{padding:6px 13px;font-size:.8rem}.confirm-delete-group{flex-wrap:wrap;align-items:center;gap:6px;display:inline-flex}.token-pill,.wallet-btn,.has-hover-price{position:relative}.token-pill{background:var(--oxford-deep);color:#fff;border:1px solid #dfb04f73;border-radius:999px;align-items:center;gap:6px;padding:5px 11px;font-size:.78rem;font-weight:700;display:inline-flex}.token-pill.unlocked{background:var(--sage);border-color:#0000}.token-pill.open{background:var(--oxford)}.token-coin,.token-coin-mini{background:radial-gradient(circle at 35% 30%, #fae39c, var(--gold));color:#161412;font-family:var(--font-mincho);border-radius:50%;flex-shrink:0;place-items:center;font-weight:800;display:inline-grid}.token-coin{block-size:26px;inline-size:26px;font-size:.78rem}.token-coin-mini{block-size:20px;inline-size:20px;font-size:.68rem}.token-hover-fiat{background:var(--ink-primary);color:var(--bg-surface);white-space:nowrap;opacity:0;visibility:hidden;pointer-events:none;z-index:60;border-radius:6px;padding:4px 10px;font-size:.74rem;font-weight:700;transition:opacity .16s,transform .16s,visibility .16s;position:absolute;inset-block-end:calc(100% + 7px);inset-inline-start:50%;transform:translate(-50%)translateY(4px);box-shadow:0 6px 18px #00000047}.token-pill:hover .token-hover-fiat,.token-pill:focus-visible .token-hover-fiat,.wallet-btn:hover .token-hover-fiat,.wallet-btn:focus-visible .token-hover-fiat,.has-hover-price:hover .token-hover-fiat,.has-hover-price:focus-visible .token-hover-fiat,.pack-card:hover .token-hover-fiat,.pack-card:focus-visible .token-hover-fiat{opacity:1;visibility:visible;transform:translate(-50%)translateY(0)}.site-header{z-index:50;background:color-mix(in srgb, var(--bg-surface) 90%, transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-block-end:1px solid var(--border);position:sticky;inset-block-start:0}.top-ribbon{background:var(--oxford-deep);color:#f3ede1;border-block-end:2px solid var(--shu);font-size:.76rem}.top-ribbon-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-block:6px;display:flex}.top-ribbon-actions{align-items:center;gap:10px;display:flex}.ribbon-btn{color:#fff;background:#ffffff1a;border-radius:999px;padding:2px 10px;font-size:.74rem;font-weight:600}.ribbon-btn:hover{background:var(--shu)}.header-main{justify-content:space-between;align-items:center;gap:16px;min-block-size:72px;padding-block:8px;display:flex}.brand{align-items:center;gap:12px;min-inline-size:0;display:flex}.hanko-crest{background:var(--shu);color:#fff;block-size:46px;inline-size:46px;font-family:var(--font-mincho);box-shadow:inset 0 0 0 2px var(--shu), inset 0 0 0 3.5px #ffffffc7;border-radius:10px;flex-shrink:0;grid-template-rows:1fr 1fr;place-items:center;padding:3px;font-size:.78rem;font-weight:800;line-height:1;display:grid;transform:rotate(-3deg)}.brand-copy{flex-direction:column;min-inline-size:0;line-height:1.15;display:flex}.brand-copy strong{font-family:var(--font-display);letter-spacing:.12em;font-size:clamp(1.05rem,2vw,1.35rem)}.brand-copy small{font-family:var(--font-mincho);letter-spacing:.14em;color:var(--shu);font-size:.66rem;font-weight:700}.primary-nav{align-items:center;gap:4px;display:flex}.nav-link{border-radius:var(--radius-sm);flex-direction:column;align-items:center;padding:6px 12px;font-size:.86rem;font-weight:600;line-height:1.2;display:flex}.nav-jp{font-family:var(--font-mincho);color:var(--ink-muted);font-size:.65rem}.nav-link:hover{background:color-mix(in srgb, var(--shu) 10%, transparent)}.nav-link.active,.nav-link.active .nav-jp{color:var(--shu)}.header-controls{align-items:center;gap:8px;display:flex}.role-chip{border:1px solid var(--border);background:var(--bg-elevated);text-align:start;border-radius:999px;align-items:center;gap:8px;padding:5px 12px;display:flex}.role-dot{background:var(--sage);border-radius:50%;block-size:9px;inline-size:9px}.role-teacher .role-dot{background:var(--gold)}.role-superadmin .role-dot{background:var(--shu)}.role-meta{flex-direction:column;line-height:1.1;display:flex}.role-meta strong{text-transform:uppercase;letter-spacing:.06em;font-size:.72rem}.role-meta small{color:var(--ink-muted);text-overflow:ellipsis;white-space:nowrap;max-inline-size:110px;font-size:.72rem;overflow:clip}.wallet-btn{background:var(--oxford-deep);color:#fff;border:1px solid #dfb04f73;border-radius:999px;align-items:center;gap:7px;padding:5px 13px 5px 6px;font-weight:700;display:inline-flex}.wallet-unit{opacity:.8;font-size:.74rem}.mobile-menu-btn{flex-direction:column;gap:4px;padding:8px;display:none}.mobile-menu-btn span{background:var(--ink-primary);block-size:2px;inline-size:22px}.hero-section{background:linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-washi) 100%);padding-block:clamp(48px,7vw,92px) clamp(90px,10vw,130px);position:relative;overflow:clip}.sakura-field{pointer-events:none;z-index:1;position:absolute;inset:0}.sakura-field span{background:var(--sakura);opacity:.75;border-radius:100% 0;animation:linear infinite petal-fall;position:absolute;inset-block-start:-20px}@keyframes petal-fall{0%{transform:translateY(-15px)rotate(0)}50%{transform:translate(32px,48vh)rotate(180deg)}to{opacity:0;transform:translate(-18px,98vh)rotate(360deg)}}@media (prefers-reduced-motion:reduce){.sakura-field{display:none}}.hero-emblem-sun{aspect-ratio:1;pointer-events:none;background:radial-gradient(circle at 38% 38%,#c53b3438,#182b4924);border:1px solid #c53b343d;border-radius:50%;inline-size:min(390px,52vw);position:absolute;inset-block-start:44px;inset-inline-end:6%}.hero-layout{z-index:2;grid-template-columns:auto 1fr 340px;align-items:center;gap:clamp(20px,3.5vw,44px);display:grid;position:relative}.vertical-kanji-banner{writing-mode:vertical-rl;font-family:var(--font-mincho);letter-spacing:.18em;color:var(--ink-primary);border-inline-start:3px solid var(--shu);padding-inline-start:14px;font-size:clamp(2.1rem,4vw,3.4rem);font-weight:800}.hero-copy{flex-direction:column;gap:16px;min-inline-size:0;display:flex}.hero-copy h1{font-size:clamp(2.5rem,6vw,4.7rem);font-weight:700;line-height:1.02}.hero-copy h1 span{color:var(--shu);letter-spacing:.08em;margin-block-start:6px;font-size:.64em;display:block}.hero-lead{color:var(--ink-secondary);max-inline-size:620px;font-size:clamp(1rem,1.4vw,1.15rem)}.hero-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.wa-ei-card{background:var(--bg-elevated);border:1px solid var(--border);border-block-start:5px solid var(--oxford);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);gap:12px;padding:24px;display:grid}.wa-ei-card-header{border-block-end:1px dashed var(--border);justify-content:space-between;align-items:center;padding-block-end:10px;display:flex}.wa-ei-list{gap:10px;font-size:.88rem;list-style:none;display:grid}.wa-ei-list li{align-items:flex-start;gap:10px;display:flex}.seigaiha-divider{opacity:.35;background-image:radial-gradient(circle at 50% 100%, transparent 18px, var(--oxford) 19px, var(--oxford) 21px, transparent 22px);pointer-events:none;background-size:48px 28px;block-size:56px;position:absolute;inset-block-end:0;inset-inline:0}.stats-strip{background:var(--oxford-deep);color:#f4eee2;border-block:2px solid var(--gold);padding-block:24px}.stats-grid{text-align:center;grid-template-columns:repeat(4,1fr);gap:18px;display:grid}.stats-grid strong{font-family:var(--font-display);color:var(--gold);font-size:clamp(1.6rem,3vw,2.25rem);display:block}.stats-grid span{opacity:.88;font-size:.82rem}.section{padding-block:clamp(52px,7vw,86px)}.section-alt{background:var(--bg-surface);border-block:1px solid var(--border)}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:18px;margin-block-end:32px;display:flex}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,310px),1fr));gap:24px;display:grid}.lesson-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);transition:transform .2s,box-shadow .2s;overflow:clip}.lesson-card:hover{box-shadow:var(--shadow-card);transform:translateY(-4px)}.lesson-card-trigger{text-align:start;flex-direction:column;block-size:100%;inline-size:100%;display:flex}.lesson-thumb{aspect-ratio:16/9;background:var(--oxford-deep);inline-size:100%;position:relative;overflow:clip}.lesson-thumb img{object-fit:cover;block-size:100%;inline-size:100%;transition:transform .35s}.lesson-card:hover .lesson-thumb img{transform:scale(1.04)}.thumb-placeholder{color:#ffffff80;block-size:100%;inline-size:100%;font-family:var(--font-mincho);place-items:center;font-size:2rem;display:grid}.lesson-jp-ribbon{color:#fff;font-family:var(--font-mincho);text-overflow:ellipsis;white-space:nowrap;background:#101e35db;border-radius:6px;max-inline-size:62%;padding:4px 10px;font-size:.78rem;font-weight:700;position:absolute;inset-block-start:10px;inset-inline-start:10px;overflow:clip}.lesson-badge-corner{z-index:3;position:absolute;inset-block-start:10px;inset-inline-end:10px}.play-medallion{color:#fff;opacity:0;background:#c53b34eb;border-radius:50%;place-items:center;block-size:50px;inline-size:50px;margin:auto;transition:opacity .2s,transform .2s;display:grid;position:absolute;inset:0;transform:scale(.85)}.lesson-card:hover .play-medallion{opacity:1;transform:scale(1)}.lesson-card-body{flex-direction:column;flex:1;gap:10px;min-inline-size:0;padding:18px;display:flex}.lesson-tags{flex-wrap:wrap;gap:6px;display:flex}.tag{border-radius:999px;padding:3px 9px;font-size:.7rem;font-weight:700}.tag-crimson{background:color-mix(in srgb, var(--shu) 14%, transparent);color:var(--shu)}.tag-oxford{background:color-mix(in srgb, var(--oxford) 16%, transparent);color:var(--ink-primary)}.tag-gold{background:color-mix(in srgb, var(--gold) 20%, transparent);color:var(--ink-primary)}.lesson-card-body h3{font-size:1.2rem}.lesson-desc{color:var(--ink-secondary);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;font-size:.87rem;display:-webkit-box;overflow:clip}.lesson-deliverables{flex-wrap:wrap;gap:6px;margin-block-start:2px;display:flex}.deliverable-chip{background:var(--bg-washi);border:1px solid var(--border);border-radius:6px;padding:3px 8px;font-size:.71rem;font-weight:600}.lesson-footer-meta{border-block-start:1px solid var(--border);justify-content:space-between;align-items:center;gap:8px;margin-block-start:auto;padding-block-start:10px;display:flex}.sensei-line{flex-direction:column;line-height:1.2;display:flex}.sensei-line strong{font-size:.82rem}.sensei-line small{color:var(--ink-muted);font-size:.72rem}.open-cta{color:var(--shu);font-size:.8rem;font-weight:700}.pillar-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:22px;display:grid}.pillar-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);text-align:center;padding:28px 22px}.pillar-kanji{border:2px solid var(--shu);block-size:64px;inline-size:64px;color:var(--shu);font-family:var(--font-mincho);border-radius:50%;place-items:center;margin-block-end:14px;font-size:1.8rem;font-weight:800;display:inline-grid}.filter-bar{flex-wrap:wrap;align-items:center;gap:10px;margin-block-end:24px;display:flex}.chip-btn{border:1.5px solid var(--border);background:var(--bg-elevated);border-radius:999px;padding:7px 15px;font-size:.84rem;font-weight:600}.chip-btn.active{background:var(--oxford);color:#fff;border-color:var(--oxford)}.panel-box{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:clamp(18px,3vw,30px)}.form-grid{gap:14px;display:grid}.form-grid label{gap:6px;font-size:.86rem;font-weight:600;display:grid}.two-col{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.three-col{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.input-with-btn{gap:8px;display:flex}.studio-layout{grid-template-columns:1.25fr .95fr;align-items:start;gap:28px;display:grid}.table-stack{gap:12px;display:grid}.item-row{border-radius:var(--radius-sm);background:var(--bg-elevated);border:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;padding:14px 16px;display:flex}.item-row-main{flex:1;align-items:center;gap:14px;min-inline-size:0;display:flex}.item-row-main img{object-fit:cover;border-radius:8px;flex-shrink:0;block-size:52px;inline-size:88px}.row-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}dialog.native-dialog{border:none;border-top:5px solid var(--shu);border-radius:var(--radius-lg);background:var(--bg-surface);color:var(--ink-primary);inline-size:100%;max-inline-size:min(94vw,1080px);margin:auto;padding:0;box-shadow:0 30px 80px -18px #0000008c}dialog.native-dialog:modal{overscroll-behavior:contain}dialog.native-dialog::backdrop{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);overscroll-behavior:contain;background:#0a101bb8;overflow:hidden}.dialog-close-btn{z-index:10;background:color-mix(in srgb, var(--ink-primary) 10%, transparent);border-radius:50%;place-items:center;block-size:36px;inline-size:36px;font-weight:700;display:grid;position:absolute;inset-block-start:12px;inset-inline-end:14px}.dialog-body{max-block-size:88dvh;padding:clamp(20px,3.5vw,34px);position:relative;overflow-y:auto}.lesson-dialog[open]{max-inline-size:min(95vw,1120px)}.lesson-dialog-shell{grid-template-columns:1.25fr .95fr;max-block-size:88dvh;display:grid;position:relative;overflow-y:auto}.lesson-stage-col{border-inline-end:1px solid var(--border);flex-direction:column;min-inline-size:0;display:flex}.video-viewport{aspect-ratio:16/9;background:#000;inline-size:100%;position:relative}.video-viewport iframe{border:0;block-size:100%;inline-size:100%;display:block}.locked-stage{block-size:100%;inline-size:100%;position:relative;overflow:clip}.locked-stage img{object-fit:cover;filter:blur(8px)brightness(.42);block-size:100%;inline-size:100%}.locked-overlay{text-align:center;color:#fff;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:20px;display:flex;position:absolute;inset:0}.hanko-lock{background:var(--shu);block-size:58px;inline-size:58px;font-family:var(--font-mincho);border-radius:50%;place-items:center;font-size:1.5rem;font-weight:800;display:grid}.lesson-stage-details{flex-direction:column;gap:10px;padding:22px 24px;display:flex}.jp-subtitle{font-family:var(--font-mincho);color:var(--shu);font-weight:700}.materials-vault{border-radius:var(--radius-sm);background:color-mix(in srgb, 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var(--shu);box-shadow:var(--shadow-card);border-radius:999px;max-inline-size:calc(100% - 28px);padding:11px 20px;font-size:.86rem;font-weight:600;position:fixed;inset-block-end:48px;inset-inline-start:50%;transform:translate(-50%)}@media (max-width:1040px){.hero-layout{grid-template-columns:1fr}.vertical-kanji-banner{display:none}.studio-layout,.lesson-dialog-shell{grid-template-columns:1fr}.lesson-stage-col{border-inline-end:none;border-block-end:1px solid var(--border)}.footer-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:820px){.mobile-menu-btn{display:flex}.primary-nav{background:var(--bg-surface);border-block-end:1px solid var(--border);box-shadow:var(--shadow-card);flex-direction:column;align-items:stretch;padding:10px 16px;display:none;position:absolute;inset-block-start:100%;inset-inline:0}.primary-nav.open{display:flex}.nav-link{flex-direction:row;justify-content:space-between;padding:11px 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