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var(--border-strong);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4);box-shadow:var(--shadow-md);font-size:var(--ui-sm);line-height:var(--ui-sm-lh);display:flex}.toast--success{border-color:var(--accent-border-strong)}.toast--error{border-color:var(--negative-border-strong)}.toast__close{color:var(--text-muted);cursor:pointer;padding:var(--space-1);border-radius:var(--radius-xs);background:0 0;border:none;display:flex}.toast__close:hover{color:var(--text-primary);background:var(--bg-hover)}.btn{justify-content:center;align-items:center;gap:var(--space-2);border-radius:var(--radius-lg);padding:0 var(--space-5);font-family:var(--font-ui);font-size:var(--ui-md);line-height:var(--ui-md-lh);font-weight:var(--w-semibold);cursor:pointer;transition:background var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), transform var(--motion-fast) var(--ease-ui);border:1px solid #0000;display:inline-flex}.btn:active:not(:disabled){transform:scale(.97)}.btn:disabled{cursor:default}.btn:focus-visible{box-shadow:var(--focus-ring);outline:none}.btn--sm{height:var(--control-sm);font-size:var(--ui-sm)}.btn--md{height:var(--control-md)}.btn--lg{height:var(--control-lg)}.btn--primary{background:var(--accent);color:var(--text-on-accent)}.btn--primary:hover:not(:disabled){background:var(--accent-hover)}.btn--primary:active:not(:disabled){background:var(--accent-active)}.btn--primary:disabled{background:var(--bg-elevated);border-color:var(--border-subtle);color:var(--text-muted)}.btn--secondary{background:var(--bg-elevated);border-color:var(--border-strong);color:var(--text-primary)}.btn--secondary:hover:not(:disabled){background:var(--bg-hover);border-color:var(--border-emphasis)}.btn--secondary:active:not(:disabled){background:var(--bg-pressed)}.btn--secondary:disabled{background:var(--bg-card);color:var(--text-muted)}.btn--ghost{color:var(--text-secondary);background:0 0}.btn--ghost:hover:not(:disabled){background:var(--bg-card);color:var(--text-primary)}.btn--ghost:active:not(:disabled){background:var(--bg-elevated)}.btn--ghost:disabled{opacity:.6}.btn--ghost-destructive{color:var(--text-secondary);background:0 0}.btn--ghost-destructive:hover:not(:disabled){background:var(--negative-tint);color:var(--negative)}.btn--ghost-destructive:active:not(:disabled){background:var(--negative-tint-strong);color:var(--negative)}.btn--ghost-destructive:disabled{opacity:.6}.btn--ghost-destructive:focus-visible{box-shadow:var(--ring-destructive)}.btn--destructive{border-color:var(--negative-border);color:var(--negative);background:0 0}.btn--destructive:hover:not(:disabled){background:var(--negative-tint)}.btn--destructive:active:not(:disabled){background:var(--negative-tint-strong);border-color:var(--negative-border-strong)}.btn--destructive:disabled{border-color:var(--border-subtle);color:var(--text-muted)}.btn--destructive:focus-visible{box-shadow:var(--ring-destructive)}.btn--link{color:var(--accent);height:auto;font-size:inherit;background:0 0;border:none;padding:0}.btn--link:hover:not(:disabled){text-decoration:underline}.field{gap:var(--space-2);flex-direction:column;display:flex}.field__label{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--text-secondary)}.field__input{height:var(--control-md);padding:0 var(--space-4);background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--ui-base);caret-color:var(--accent);transition:border-color var(--motion-fast) var(--ease-ui)}.field__input::placeholder{color:var(--text-muted)}.field__input:hover:not(:focus){border-color:var(--border-strong)}.field__input:focus-visible{border-color:var(--accent);box-shadow:var(--focus-ring);outline:none}.field__input--error{border:1.5px solid var(--negative-border-strong)}.field__error{align-items:center;gap:var(--space-1);font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--negative);display:flex}.field__hint{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--text-muted)}.auth{padding:var(--space-6) var(--space-4);flex:1;justify-content:center;align-items:center;display:flex}.auth__card{gap:var(--space-4);background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-xl);width:100%;max-width:400px;padding:var(--space-8) var(--space-6);box-shadow:var(--shadow-lg), var(--glow-accent);flex-direction:column;display:flex}.auth__wordmark{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold);letter-spacing:-.01em}.auth__wordmark-dot{color:var(--accent)}.auth__title{font-size:var(--ui-xl);line-height:var(--ui-xl-lh);font-weight:var(--w-semibold)}.auth__invite input{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.08em}.auth__error{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--negative);background:var(--negative-tint);border:1px solid var(--negative-border);border-radius:var(--radius-sm);padding:var(--space-2) var(--space-3)}.auth__alt{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--text-secondary);text-align:center}.auth__hp{width:1px;height:1px;position:absolute;top:auto;left:-9999px;overflow:hidden}.modal{max-width:min(480px, calc(100vw - 2 * var(--space-4)));width:100%;color:var(--text-primary);background:0 0;border:none;margin:auto;padding:0}.modal::backdrop{background:var(--bg-overlay)}.modal__panel{max-height:calc(100dvh - 2 * var(--space-8));border:1px solid var(--border-default);border-radius:var(--radius-lg);background:var(--bg-elevated);box-shadow:var(--shadow-lg);flex-direction:column;display:flex;overflow:hidden}.modal__header{justify-content:space-between;align-items:center;gap:var(--space-3);padding:var(--space-5) var(--space-5) var(--space-3);display:flex}.modal__title{font-size:var(--ui-md);line-height:var(--ui-md-lh);font-weight:var(--w-semibold);margin:0}.modal__body{padding:0 var(--space-5) var(--space-5);overflow-y:auto}.modal__body--flush{padding:0}.modal__panel--editor{background:var(--bg-card);border-radius:var(--radius-xl)}.modal--wide{max-width:min(680px, calc(100vw - 2 * var(--space-4)))}@media (width<=640px){.modal:not(.modal--fullscreen-mobile){width:100vw;max-width:none;margin:auto auto 0}.modal:not(.modal--fullscreen-mobile) .modal__panel{border-radius:var(--radius-xl) var(--radius-xl) 0 0;padding-top:var(--space-3);border-bottom:none}.modal:not(.modal--fullscreen-mobile) .modal__panel:before{content:"";width:36px;height:4px;margin:0 auto var(--space-2);border-radius:var(--radius-xs);background:var(--border-strong)}.modal--fullscreen-mobile{width:100vw;max-width:none;height:100dvh;height:var(--vvh,100dvh);margin:0}.modal--fullscreen-mobile .modal__panel{border:none;border-radius:0;height:100%;max-height:none}}.deck-form{gap:var(--space-5);flex-direction:column;display:flex}.deck-form__actions{justify-content:flex-end;gap:var(--space-2);display:flex}.deck-ring{--deck-ring-gap:var(--bg-card);width:var(--deck-ring-size);height:var(--deck-ring-size);flex:0 0 var(--deck-ring-size);border-radius:var(--radius-pill);background:conic-gradient(var(--accent) var(--deck-ring-progress), var(--border-subtle) var(--deck-ring-progress));place-items:center;display:grid}.deck-ring--on-page{--deck-ring-gap:var(--bg-page)}.deck-ring--on-elevated{--deck-ring-gap:var(--bg-elevated)}.deck-ring__cover{width:calc(var(--deck-ring-size) - 8px);height:calc(var(--deck-ring-size) - 8px);border:2px solid var(--deck-ring-gap);border-radius:var(--radius-pill)}.deck-tile{gap:var(--space-3);height:100%;padding:var(--space-4) var(--space-5);border:1px solid var(--border-default);border-radius:var(--radius-lg);background:var(--bg-card);color:inherit;transition:border-color var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui), transform var(--motion-fast) var(--ease-ui);flex-direction:column;display:flex;position:relative}.deck-tile:hover{border-color:var(--border-emphasis);background:var(--bg-elevated);transform:translateY(-2px)}.deck-tile--beyondLimit{border-color:var(--warning-border)}.deck-tile--beyondLimit:hover{border-color:var(--warning)}.deck-tile__top{justify-content:space-between;align-items:flex-start;gap:var(--space-3);display:flex}.deck-tile__metric{align-items:flex-end;gap:var(--space-1);min-width:0;color:var(--text-muted);font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.08em;text-transform:uppercase;text-align:right;flex-direction:column;display:flex}.deck-tile__metric strong{color:var(--text-secondary);font-family:var(--font-ui);font-size:var(--card-sm);line-height:1;font-weight:var(--w-bold);letter-spacing:normal}.deck-tile__metric--accent strong{color:var(--accent)}.deck-tile__metric--quiet strong{font-size:var(--ui-sm);font-weight:var(--w-semibold);white-space:nowrap}.deck-tile__metric--warning,.deck-tile__metric-icon{color:var(--warning)}.deck-tile__body{justify-content:space-between;align-items:flex-end;gap:var(--space-2);min-width:0;display:flex}.deck-tile__identity{gap:var(--space-1);flex-direction:column;min-width:0;display:flex}.deck-tile__primary{color:inherit;font:inherit;font-size:var(--ui-base);line-height:var(--ui-base-lh);font-weight:var(--w-semibold);text-align:left;overflow-wrap:anywhere;cursor:pointer;background:0 0;border:0;padding:0;text-decoration:none}.deck-tile__primary:after{content:"";border-radius:var(--radius-lg);position:absolute;inset:0}.deck-tile__primary:hover{text-decoration:none}.deck-tile__primary:focus-visible{box-shadow:none}.deck-tile__primary:focus-visible:after{box-shadow:var(--focus-ring)}.deck-tile__meta{color:var(--text-secondary);font-size:var(--ui-sm);line-height:var(--ui-sm-lh)}.deck-tile__manage{color:var(--text-muted);flex-shrink:0;text-decoration:none;position:relative}.deck-tile__manage:hover{color:var(--text-primary);text-decoration:none}.soft-limit{gap:var(--space-2);padding:var(--space-4);border:1px solid var(--warning-border);border-radius:var(--radius-lg);background:var(--warning-tint);flex-direction:column;display:flex}.soft-limit__head{align-items:center;gap:var(--space-2);color:var(--text-primary);font-size:var(--ui-base);line-height:var(--ui-base-lh);font-weight:var(--w-semibold);display:flex}.soft-limit__icon{color:var(--warning);flex-shrink:0}.soft-limit__body{color:var(--text-secondary);font-size:var(--ui-sm);line-height:var(--ui-sm-lh)}.soft-limit__note{color:var(--text-muted);font-size:var(--ui-xs);line-height:var(--ui-sm-lh)}.soft-limit__action{margin-top:var(--space-1);align-self:flex-start}.deck-mini{align-items:center;gap:var(--space-3);width:100%;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);color:inherit;font-family:var(--font-ui);text-align:left;cursor:pointer;transition:border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui);background:0 0;border:1px solid #0000;display:flex}.deck-mini:hover{border-color:var(--border-default)}.deck-mini--selected{border-color:var(--accent-border-strong)}.deck-mini__body{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.deck-mini__name{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);font-weight:var(--w-semibold);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.deck-mini--selected .deck-mini__name{color:var(--accent)}.deck-mini__meta{color:var(--text-muted);font-family:var(--font-mono);font-size:var(--ui-xs);line-height:var(--ui-xs-lh)}.deck-mini__metric{color:var(--text-muted);font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.08em;text-transform:uppercase;text-align:right;flex-direction:column;flex:none;align-items:flex-end;gap:1px;display:flex}.deck-mini__metric strong{color:var(--text-secondary);font-family:var(--font-ui);font-size:var(--ui-md);line-height:1;font-weight:var(--w-bold);letter-spacing:normal}.deck-mini__metric--accent strong{color:var(--accent)}.deck-mini__check{border:1px solid var(--border-default);border-radius:var(--radius-pill);width:20px;height:20px;color:var(--text-on-accent);opacity:0;transition:opacity var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);flex:none;place-items:center;display:grid}.deck-mini--selected .deck-mini__check{border-color:var(--accent);background:var(--accent);opacity:1}.study-scope{align-items:center;gap:var(--space-3);flex:auto;min-width:0;display:flex;position:relative}.study-scope__chips{align-items:center;gap:var(--space-2);min-width:0;margin:0;padding:0;list-style:none;display:flex;overflow:hidden}.study-scope__chip{align-items:center;gap:var(--space-2);height:var(--control-md);min-width:0;max-width:180px;padding:0 var(--space-2);border:1px solid var(--border-default);border-radius:var(--radius-pill);background:var(--bg-card);flex:0 auto;display:flex}.study-scope__chip:has(.study-scope__chip-remove:hover){border-color:var(--negative-border)}.study-scope__chip-name{min-width:0;font-size:var(--ui-sm);font-weight:var(--w-medium);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.study-scope__chip-remove{border-radius:var(--radius-pill);background:var(--bg-elevated);width:20px;height:20px;color:var(--text-muted);cursor:pointer;transition:background var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), opacity var(--motion-fast) var(--ease-ui);border:none;flex:none;place-items:center;padding:0;display:grid}.study-scope__chip-remove:hover{background:var(--negative-tint-strong);color:var(--negative)}@media (hover:hover){.study-scope__chip-remove{opacity:0}.study-scope__chip:hover .study-scope__chip-remove,.study-scope__chip:focus-within .study-scope__chip-remove{opacity:1}}.study-scope__more{height:var(--control-md);padding:0 var(--space-3);border:1px dashed var(--border-default);border-radius:var(--radius-pill);color:var(--text-muted);font-family:var(--font-mono);font-size:var(--ui-xs);place-items:center;display:grid}.study-scope__trigger{width:var(--control-md);height:var(--control-md);border:1px dashed var(--border-strong);border-radius:var(--radius-pill);color:var(--text-secondary);cursor:pointer;transition:border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui), transform var(--motion-fast) var(--ease-ui);background:0 0;flex:none;place-items:center;padding:0;display:grid}.study-scope__trigger:hover,.study-scope__trigger--open{border-color:var(--accent-border-strong);color:var(--accent);border-style:solid}.study-scope__trigger--open{transform:rotate(45deg)}.study-scope__panel{top:calc(100% + var(--space-3));z-index:var(--z-overlay);gap:var(--space-3);width:320px;max-width:calc(100vw - var(--space-8));padding:var(--space-4);border:1px solid var(--border-default);border-radius:var(--radius-lg);background:var(--bg-elevated);box-shadow:var(--shadow-lg);flex-direction:column;display:flex;position:absolute;left:0}.study-scope__panel-head{gap:var(--space-1);flex-direction:column;display:flex}.study-scope__panel-head h3{font-size:var(--ui-base);line-height:var(--ui-base-lh);font-weight:var(--w-semibold);margin:0}.study-scope__panel-head p{color:var(--text-secondary);font-size:var(--ui-sm);line-height:var(--ui-sm-lh);margin:0}.study-scope__list{gap:var(--space-1);flex-direction:column;max-height:320px;margin:0;padding:0;list-style:none;display:flex;overflow-y:auto}.study-scope__panel-foot{padding-top:var(--space-2);border-top:1px solid var(--border-subtle);justify-content:flex-end;display:flex}.study-scope__clear{padding:var(--space-1) var(--space-2);border-radius:var(--radius-xs);color:var(--text-secondary);font-family:var(--font-ui);font-size:var(--ui-sm);cursor:pointer;transition:color var(--motion-fast) var(--ease-ui);background:0 0;border:none}.study-scope__clear:hover{color:var(--accent)}@media 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0;border:none;padding:0;text-decoration:underline}.study-bar{width:420px;max-width:100%;height:72px;padding:0 var(--space-6);border-radius:var(--radius-xl);background:var(--accent);box-shadow:var(--glow-accent);color:var(--text-on-accent);font-family:var(--font-ui);cursor:pointer;transition:background var(--motion-fast) var(--ease-ui), transform var(--motion-fast) var(--ease-ui), box-shadow var(--motion-fast) var(--ease-ui);border:none;flex:none;justify-content:space-between;align-items:center;display:flex}.study-bar:hover:not(:disabled){background:var(--accent-hover);box-shadow:var(--shadow-md), var(--glow-accent);transform:translateY(-1px)}.study-bar:active:not(:disabled){background:var(--accent-active);transform:translateY(0)}.study-bar:disabled{background:var(--bg-elevated);color:var(--text-muted);box-shadow:none;cursor:default}.study-bar__label{font-size:var(--ui-lg);font-weight:var(--w-bold)}.study-bar__metric{align-items:baseline;gap:var(--space-2);display:flex}.study-bar__metric strong{font-size:var(--card-sm);line-height:1;font-weight:var(--w-bold)}.study-bar__metric span{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.08em;text-transform:uppercase;opacity:.65}.study-bar__next{white-space:nowrap}.dashboard__decks{gap:var(--space-4);flex-direction:column;display:flex}.dashboard__section-header{justify-content:space-between;align-items:center;gap:var(--space-4);max-width:920px;display:flex}.dashboard__section-header h2,.dashboard__section-title{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold);margin:0}.dashboard__deck-grid{gap:var(--space-4);grid-template-columns:repeat(3,minmax(0,1fr));max-width:920px;margin:0;padding:0;list-style:none;display:grid}.dashboard__activity{gap:var(--space-4);flex-direction:column;display:flex}.dashboard__heatmap{gap:var(--space-3);width:fit-content;max-width:100%;padding:var(--space-5);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);background:var(--bg-card);flex-direction:column;display:flex}.dashboard__heat-grid{grid-template-rows:repeat(7,12px);grid-auto-columns:12px;grid-auto-flow:column;gap:3px;display:grid;overflow:hidden}.dashboard__heat-cell{background:var(--heat-0);width:12px;height:12px;box-shadow:inset 0 0 0 1px var(--border-subtle);border-radius:3px}.dashboard__heat-caption{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin:0}.dashboard__status{padding:var(--space-8);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);color:var(--text-secondary)}.dashboard__status--error{color:var(--negative)}.dashboard__empty{text-align:center;align-items:center;gap:var(--space-3);padding:var(--space-16) var(--space-6);flex-direction:column;display:flex}.dashboard__empty-icon{border:1.5px dashed var(--accent-border-strong);border-radius:var(--radius-pill);width:64px;height:64px;color:var(--accent);margin-bottom:var(--space-2);justify-content:center;align-items:center;display:flex}.dashboard__empty-title{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold)}.dashboard__empty-body{font-size:var(--ui-sm);line-height:var(--ui-sm-lh);color:var(--text-secondary);max-width:44ch}@media (width<=900px){.dashboard__deck-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=700px){.dashboard{gap:var(--space-6)}.dashboard__study-row{gap:var(--space-3);flex-wrap:wrap}.study-bar{width:100%;height:64px;padding:0 var(--space-5)}.dashboard__deck-grid{grid-template-columns:1fr}}.state-panel{align-items:center;gap:var(--space-3);text-align:center;padding:var(--space-12) var(--space-4);border:1px solid var(--border-default);border-radius:var(--radius-lg);flex-direction:column;display:flex}.state-panel__badge{border:1px dashed var(--border-strong);width:52px;height:52px;color:var(--accent);border-radius:50%;justify-content:center;align-items:center;display:flex}.state-panel--negative .state-panel__badge{border-color:var(--negative-border);color:var(--negative)}.state-panel__title{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold);margin:0}.state-panel__body{margin:0 0 var(--space-2);max-width:42ch;color:var(--text-secondary)}.card-editor{gap:var(--space-5);padding:var(--space-6);flex-direction:column;display:flex}.card-editor__header{justify-content:space-between;align-items:center;gap:var(--space-3);display:flex}.card-editor__title{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold);margin:0}.card-editor__header-right{align-items:center;gap:var(--space-3);display:flex}.card-editor__deck-chip{align-items:center;gap:var(--space-2);height:var(--control-sm);padding:0 var(--space-3);border:1px solid var(--border-default);border-radius:var(--radius-pill);background:var(--bg-elevated);font-size:var(--ui-sm);font-weight:var(--w-semibold);white-space:nowrap;display:inline-flex}.card-editor__deck-dot{border-radius:var(--radius-pill);width:10px;height:10px}.card-editor__session{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);white-space:nowrap}.card-editor__notice{padding:var(--space-2) var(--space-3);border:1px solid var(--warning-border);border-radius:var(--radius-md);background:var(--warning-tint);color:var(--warning);font-size:var(--ui-sm);margin:0}.card-editor__fields{gap:var(--space-4);flex-direction:column;display:flex}.editor-field{gap:var(--space-2);flex-direction:column;display:flex}.editor-field__head{justify-content:space-between;align-items:baseline;display:flex}.editor-field__label{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted)}.editor-field__count{font-family:var(--font-mono);font-size:var(--ui-xs);color:var(--text-muted)}.editor-field__count--over{color:var(--negative)}.editor-field__box{min-height:120px;padding:var(--space-5);border:1px solid var(--border-default);border-radius:var(--radius-lg);transition:border-color var(--motion-fast) var(--ease-ui);justify-content:center;align-items:center;display:flex}.editor-field__box--front{background:var(--bg-card-gradient)}.editor-field__box--back{background:var(--bg-card)}.editor-field__box:focus-within{border-color:var(--accent-border-strong);box-shadow:var(--focus-ring)}.editor-field__input:focus-visible{box-shadow:none}.editor-field__input{resize:none;text-align:center;width:100%;max-height:40vh;color:var(--text-primary);font-family:var(--font-ui);font-size:var(--card-sm);line-height:var(--card-lh);font-weight:var(--w-semibold);caret-color:var(--accent);background:0 0;border:none;outline:none;overflow:hidden auto}.editor-field__input::placeholder{color:var(--text-muted);font-weight:var(--w-regular)}.editor-field__input:disabled{color:var(--text-secondary)}.switch{border-radius:var(--radius-pill);background:var(--border-default);appearance:none;cursor:pointer;width:44px;height:26px;transition:background var(--motion-fast) var(--ease-ui);border:none;flex-shrink:0;padding:0;position:relative}.switch__thumb{border-radius:var(--radius-pill);background:var(--text-secondary);width:20px;height:20px;transition:transform var(--motion-fast) var(--ease-ui), background var(--motion-fast) var(--ease-ui);position:absolute;top:3px;left:3px}.switch[aria-checked=true]{background:var(--accent)}.switch[aria-checked=true] .switch__thumb{background:var(--text-on-accent);transform:translate(18px)}.switch:focus-visible{box-shadow:var(--focus-ring);outline:none}.card-editor__reverse{align-items:center;gap:var(--space-3);font-size:var(--ui-sm);color:var(--text-primary);cursor:pointer;display:inline-flex}.card-editor__error{color:var(--negative);font-size:var(--ui-sm);margin:0}.card-editor__footer{justify-content:space-between;align-items:center;gap:var(--space-4);flex-wrap:wrap;display:flex}.card-editor__hint{align-items:center;gap:var(--space-2);color:var(--text-muted);font-size:var(--ui-sm);display:inline-flex}.card-editor__hint-sep{color:var(--border-strong)}.card-editor__save{margin-left:auto}@media (width<=640px){.modal--fullscreen-mobile .card-editor{gap:var(--space-4);height:100%;padding:calc(var(--space-4) + env(safe-area-inset-top,0px)) var(--space-5) calc(var(--space-4) + env(safe-area-inset-bottom,0px))}.modal--fullscreen-mobile .card-editor__fields,.modal--fullscreen-mobile .editor-field{flex:1;min-height:0}.modal--fullscreen-mobile .editor-field__box{height:100%}.modal--fullscreen-mobile .editor-field__input{max-height:100%}.card-editor__reverse{width:100%;padding:var(--space-3) var(--space-4);border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:var(--bg-card);flex-direction:row-reverse;order:-1;justify-content:space-between}.card-editor__footer{justify-content:center}.card-editor__hint{justify-content:center;width:100%}}.deck-view{gap:var(--space-5);width:100%;max-width:var(--content-max);flex-direction:column;display:flex}.deck-view__status{color:var(--text-secondary)}.deck-view__status--error{color:var(--negative)}.deck-view__back{align-items:center;gap:var(--space-2);color:var(--text-secondary);font-size:var(--ui-sm);align-self:flex-start;text-decoration:none;display:inline-flex}.deck-view__back:hover{color:var(--text-primary)}.deck-view__header{justify-content:space-between;align-items:flex-start;gap:var(--space-4);padding-bottom:var(--space-6);border-bottom:1px solid var(--border-subtle);flex-wrap:wrap;display:flex}.deck-view__identity{align-items:center;gap:var(--space-4);display:flex}.deck-view__name{font-size:var(--ui-xl);line-height:var(--ui-xl-lh);font-weight:var(--w-semibold);overflow-wrap:anywhere;margin:0}.deck-view__meta{margin:var(--space-1) 0 0;color:var(--text-secondary);font-size:var(--ui-sm)}.deck-view__incomplete{color:var(--accent)}.deck-view__actions{align-items:center;gap:var(--space-2);flex-wrap:wrap;display:flex}.deck-search{align-items:center;gap:var(--space-2);max-width:420px;height:var(--control-md);padding:0 var(--space-4);border:1px solid var(--border-default);border-radius:var(--radius-md);background:var(--bg-card);transition:border-color var(--motion-fast) var(--ease-ui);display:flex}.deck-search:focus-within{border-color:var(--accent);box-shadow:var(--focus-ring)}.deck-search__input:focus-visible{box-shadow:none}.deck-search__icon{color:var(--text-muted);flex-shrink:0}.deck-search__input{min-width:0;color:var(--text-primary);font-size:var(--ui-base);caret-color:var(--accent);background:0 0;border:none;outline:none;flex:1}.deck-search__input::placeholder{color:var(--text-muted)}.deck-view__empty{align-items:center;gap:var(--space-3);text-align:center;padding:var(--space-12) var(--space-4);border:1px dashed var(--border-default);border-radius:var(--radius-lg);flex-direction:column;display:flex}.deck-view__empty-title{font-size:var(--ui-lg);line-height:var(--ui-lg-lh);font-weight:var(--w-semibold);margin:0}.deck-view__empty-body{margin:0 0 var(--space-2);max-width:42ch;color:var(--text-secondary)}.deck-view__cards{border:1px solid var(--border-subtle);border-radius:var(--radius-lg);background:var(--bg-card-gradient);margin:0;padding:0;list-style:none;overflow:hidden}.deck-view__cards>li+li .card-row{border-top:1px solid var(--border-subtle)}.card-row{align-items:center;gap:var(--space-4);width:100%;min-height:68px;padding:var(--space-4) var(--space-5);text-align:left;cursor:pointer;transition:background var(--motion-fast) var(--ease-ui);background:0 0;border:none;display:flex}.card-row:hover{background:var(--bg-hover)}.card-row__front{min-width:0;color:var(--text-primary);font-size:var(--ui-base);font-weight:var(--w-semibold);white-space:nowrap;text-overflow:ellipsis;flex:1;overflow:hidden}.card-row__back{min-width:0;color:var(--text-secondary);font-size:var(--ui-sm);white-space:nowrap;text-overflow:ellipsis;flex:1;overflow:hidden}.card-row__chip{padding:3px var(--space-2);border-radius:var(--radius-pill);background:var(--accent-tint);border:1px solid var(--accent-border);color:var(--accent);font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.04em;flex-shrink:0}.deck-view__fab{display:none}@media (width<=640px){.deck-view__add{display:none}.deck-view__fab{right:var(--space-5);bottom:calc(var(--space-16) + env(safe-area-inset-bottom,0px));width:var(--control-lg);height:var(--control-lg);border-radius:var(--radius-lg);background:var(--accent);color:var(--text-on-accent);box-shadow:var(--shadow-md);cursor:pointer;z-index:var(--z-overlay);border:none;justify-content:center;align-items:center;display:inline-flex;position:fixed}}.confirm{gap:var(--space-5);flex-direction:column;display:flex}.confirm__message{color:var(--text-secondary);margin:0}.confirm__actions{justify-content:flex-end;gap:var(--space-2);display:flex}.deck-view__limit-chip{align-items:center;gap:var(--space-2);height:var(--control-md);padding:0 var(--space-3);border:1px solid var(--warning-border);border-radius:var(--radius-pill);color:var(--warning);font-size:var(--ui-sm);display:inline-flex}.content-blocks{gap:var(--space-2);flex-direction:column;display:flex}.content-block__text{white-space:pre-wrap;overflow-wrap:anywhere;color:var(--text-primary);font-size:var(--ui-base);line-height:var(--ui-base-lh);margin:0}.content-blocks--inherit .content-block__text{font-size:inherit;line-height:inherit;color:inherit;font-weight:inherit}.content-block__unsupported{padding:var(--space-1) var(--space-2);border:1px solid var(--warning-border);border-radius:var(--radius-pill);background:var(--warning-tint);color:var(--warning);font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.06em;align-self:flex-start}.study{background:var(--bg-page);flex-direction:column;min-height:100dvh;display:flex;overflow-x:clip}.study--panel{padding:var(--space-6) var(--space-4);justify-content:center;align-items:center}.study__header{align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-6) 0;display:flex}.study__progress{flex:1;gap:4px;display:flex}.study__segment{background:var(--border-subtle);height:5px;transition:background var(--motion-fast) var(--ease-ui);border-radius:3px;flex:1}.study__segment--on{background:var(--accent)}.study__counter{font-family:var(--font-mono);font-size:var(--ui-xs);color:var(--text-muted)}.study__stage{padding:var(--space-4) var(--space-5);flex:1;justify-content:center;align-items:center;display:flex}.study__zone{--flip-tilt:-.6deg;-webkit-user-select:none;user-select:none;width:100%;position:relative}.study__stack{justify-content:center;align-items:center;gap:var(--space-6);padding:var(--space-10) var(--space-6);background:var(--bg-card-gradient);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);will-change:transform;transition:transform var(--motion-base) var(--ease-spring), opacity var(--motion-base) var(--ease-ui);flex-direction:column;display:flex;position:absolute;inset:0;overflow:hidden}.study__stack--1{transform:translateY(calc(12px * (1 - var(--drag-progress,0)))) rotate(calc(1.2deg + (var(--flip-tilt,-.6deg) - 1.2deg) * var(--drag-progress,0))) scale(calc(.955 + .045 * var(--drag-progress,0)));opacity:calc(.9 + .1 * var(--drag-progress,0))}.study__stack--2{transform:translateY(calc(22px - 10px * var(--drag-progress,0))) rotate(calc(-1deg + 2.2deg * var(--drag-progress,0))) scale(calc(.915 + .04 * var(--drag-progress,0)));opacity:calc(.55 + .35 * var(--drag-progress,0))}.study__card-layer{perspective:1400px;will-change:transform;position:relative}.study__card-layer--exit-left,.study__card-layer--exit-right,.study__card-layer--settle{transition:transform var(--motion-base) var(--ease-spring), opacity var(--motion-base) var(--ease-ui)}.study__card-layer--glide{transition:transform var(--glide-duration,var(--motion-fast)) cubic-bezier(.15, .55, .5, .75)}.study__card-layer--exit-left{opacity:0;transform:translate(-140%)rotate(-10deg)}.study__card-layer--exit-right{opacity:0;transform:translate(140%)rotate(10deg)}@keyframes study-card-promote{0%{opacity:.85;transform:translateY(12px)scale(.955)}}.study__card-layer{animation:study-card-promote var(--motion-base) var(--ease-spring)}.study__card-layer--seamless{animation:none}.study__flip{transform-style:preserve-3d;transition:transform var(--motion-base) var(--ease-spring);cursor:pointer;touch-action:pan-y;transform:rotate(var(--flip-tilt,-.6deg)) rotateY(0deg);display:grid}.study__flip--flipped{transform:rotate(0)rotateY(180deg)}.study__face{backface-visibility:hidden;justify-content:center;align-items:center;gap:var(--space-6);background:var(--bg-card-gradient);border:1px solid var(--drag-border,var(--border-default));border-radius:var(--radius-xl);min-width:0;padding:var(--space-10) var(--space-6);min-height:340px;box-shadow:var(--shadow-lg), var(--glow-accent), var(--drag-glow,0 0 0 transparent);flex-direction:column;grid-area:1/1;display:flex}.study__face--back{gap:var(--space-5);transform:rotateY(180deg)}.study__deck{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.16em;text-transform:uppercase;color:var(--accent);background:var(--accent-tint);border:1px solid var(--accent-border);border-radius:var(--radius-pill);padding:4px 12px}.study__text{overflow-wrap:anywhere;text-align:center;letter-spacing:-.01em;max-width:100%;font-weight:var(--w-semibold);line-height:1.15}.study__text--xl{font-size:clamp(2.75rem,8vw,4.25rem);line-height:1.05}.study__text--lg{font-size:clamp(2rem,5.5vw,3.25rem);line-height:1.1}.study__text--md{font-size:clamp(1.5rem,3.5vw,2.25rem);line-height:1.2}.study__text--sm{font-size:clamp(1.125rem,2.4vw,1.5rem);line-height:1.45;font-weight:var(--w-medium)}.study__text--xs{font-size:clamp(.9375rem,2vw,1.0625rem);line-height:1.55;font-weight:var(--w-regular);letter-spacing:0}.study__text--asked{font-size:clamp(1rem,2vw,1.3rem);line-height:1.3;font-weight:var(--w-medium);color:var(--text-muted)}.study__text--answer{font-weight:var(--w-bold)}.study__divider{background:linear-gradient(90deg, transparent, var(--accent-border-strong), transparent);width:100%;height:1px}.study__actions{justify-content:center;align-items:center;gap:var(--space-3);padding:0 var(--space-5);display:flex}.study__rewind{width:var(--control-lg);height:var(--control-lg);background:var(--bg-card);border:1px solid var(--border-default);color:var(--text-secondary);cursor:pointer;transition:border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.study__rewind svg{transition:transform var(--motion-base) var(--ease-spring)}.study__rewind:hover:not(:disabled){border-color:var(--border-strong);color:var(--text-primary)}.study__rewind:hover:not(:disabled) svg{transform:rotate(-70deg)}.study__rewind:disabled{opacity:.35;cursor:default}.study__grade{height:var(--control-lg);justify-content:center;gap:var(--space-3);max-width:300px;font-size:var(--ui-md);font-weight:var(--w-semibold);border-radius:var(--radius-lg);transition:background var(--motion-fast) var(--ease-ui), border-color var(--motion-fast) var(--ease-ui), color var(--motion-fast) var(--ease-ui);flex:1}.study__grade--good{background:var(--bg-elevated);border-color:var(--border-strong)}.study__grade--again:hover:not(:disabled){border-color:var(--negative-border);background:var(--negative-tint);color:var(--negative)}.study__grade--good:hover:not(:disabled){border-color:var(--accent-border-strong);background:var(--accent-tint);color:var(--accent)}.study__hints{padding:var(--space-3) var(--space-5) var(--space-4);text-align:center;font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.06em;color:var(--text-muted);margin:0;display:none}@property --result-accuracy{syntax:"<percentage>";inherits:false;initial-value:0%}.result{align-items:center;gap:var(--space-6);text-align:center;flex-direction:column;width:min(100%,420px);display:flex}.result__eyebrow{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.18em;text-transform:uppercase;color:var(--text-muted);margin:0}.result__ring{background:conic-gradient(var(--accent) var(--result-accuracy), var(--border-subtle) 0);width:170px;height:170px;box-shadow:var(--glow-accent);transition:--result-accuracy var(--motion-slow) var(--ease-spring);border-radius:50%;justify-content:center;align-items:center;display:flex}.result__ring-inner{background:var(--bg-card);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;gap:2px;width:146px;height:146px;display:flex}.result__ring-value{font-size:44px;font-weight:var(--w-bold);line-height:1}.result__ring-unit{color:var(--text-secondary);font-size:22px}.result__ring-label{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted)}.result__tiles{gap:var(--space-3);width:100%;display:flex}.result__tile{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:var(--space-4) var(--space-2);flex-direction:column;flex:1;align-items:center;gap:3px;display:flex}.result__tile-value{font-size:var(--ui-lg);font-weight:var(--w-bold)}.result__tile-label{font-family:var(--font-mono);font-size:var(--ui-xs);letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted)}.result__body{color:var(--text-secondary);margin:0;line-height:1.5}@media (width>=860px){.study__header{padding:var(--space-6) var(--space-10) 0}.study__progress{flex:initial;margin-left:auto}.study__segment{flex:initial;width:24px}.study__zone{width:640px}.study__stack,.study__face{border-radius:var(--radius-2xl)}.study__face{padding:var(--space-14) var(--space-12);min-height:420px}.study__stack{padding:var(--space-14) var(--space-12)}.study__zone{--flip-tilt:0deg}.study__actions{padding-bottom:0}.study__grade{flex:initial;width:300px}.study__hints{display:block}}@media (width<=859px){.study__actions{padding-bottom:var(--space-6)}}