.authored-lines{display:grid;gap:.6rem}.authored-lines__item{display:grid;gap:.18rem;width:100%;text-align:left;border:1px solid rgb(var(--c-slate)/.16);background:rgb(var(--c-surface-cool)/.9);color:var(--foreground);border-radius:14px;padding:.68rem .82rem;cursor:pointer}.authored-lines__header{display:flex;align-items:center;justify-content:space-between;gap:.6rem}.authored-lines__item strong{font-size:.94rem;line-height:1.25;min-width:0}.authored-lines__title-input{flex:1 1 auto;min-width:0;padding:.32rem .48rem;border-radius:10px;border:1px solid rgb(var(--c-slate)/.2);background:rgb(var(--c-surface)/.92);color:var(--foreground);font:inherit;font-size:.94rem;font-weight:700}.authored-lines__action{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;width:1.8rem;height:1.8rem;border-radius:999px;border:1px solid rgb(var(--c-slate)/.16);background:rgb(var(--c-surface)/.92);color:var(--muted-strong)}.authored-lines__action:hover{color:var(--foreground);border-color:rgb(var(--c-gold)/.28)}.authored-lines__item span{color:var(--muted);font-size:.82rem;line-height:1.35;overflow-wrap:anywhere}.authored-lines__item--active{border-color:rgb(var(--c-gold)/.26);background:rgb(var(--c-parchment-wash-4)/.82);box-shadow:inset 0 0 0 1px rgb(var(--c-gold)/.12)}.authored-lines--homepage{grid-template-columns:repeat(auto-fit,minmax(11rem,1fr))}.study-move-menu{position:fixed;z-index:90;display:grid;gap:.2rem;min-width:12.5rem;max-width:min(16rem,calc(100vw - 1.5rem));padding:.35rem;border-radius:14px;border:1px solid rgb(var(--c-slate)/.16);background:rgb(var(--c-surface)/.98);box-shadow:0 18px 42px rgb(var(--c-ink-slate)/.16);transform:translate(-.25rem,-.25rem)}.study-move-menu__item{width:100%;text-align:left;border:0;border-radius:10px;background:transparent;color:var(--foreground);padding:.7rem .85rem;font:inherit}.study-move-menu__item:hover{background:rgb(var(--c-parchment-wash-2)/.72)}.study-move-menu--compact{min-width:11rem;max-width:14rem;transform:none}.study-move-menu--compact .study-move-menu__item{padding:.6rem .75rem}.learner-practice{display:grid;gap:1rem}.learner-practice__feedback{padding:.85rem 1rem;border-radius:1rem;border:1px solid rgb(var(--c-slate)/.16);background:rgb(var(--c-surface-cool)/.92);color:var(--foreground);font-weight:700}.learner-practice__feedback--success{border-color:rgb(var(--c-green)/.24);background:rgb(var(--c-green-wash)/.9);color:rgb(var(--c-green-deep))}.learner-practice__feedback--error{border-color:rgb(var(--c-red-strong)/.22);background:rgb(var(--c-red-wash-2)/.92);color:rgb(var(--c-red-deep-3))}.practice-layout{display:grid;gap:1rem;align-items:start}.practice-board-card,.practice-panel{padding:clamp(1rem,1.7vw,1.35rem)}.practice-board-card{--board-vertical-reserve:16.75rem;display:grid;gap:.75rem}.practice-panel{display:grid;gap:.82rem}.practice-board-card__header{display:flex;align-items:center;justify-content:space-between;gap:.8rem}.practice-board-card__header .eyebrow{margin:0 0 .25rem;color:var(--muted);font-size:.86rem;font-weight:800}.practice-board-card__header h2,.practice-panel h2{margin:0}.practice-progress-card{display:grid;justify-items:end;gap:.42rem;width:min(17.5rem,42%);min-width:12rem}.practice-status-pill{display:inline-flex;align-items:center;border:1px solid rgb(var(--c-gold)/.2);border-radius:999px;background:rgb(var(--c-parchment)/.72);color:rgb(var(--c-bronze-strong));font-weight:850;padding:.45rem .75rem}.practice-progress{width:100%}.practice-progress__track{height:.72rem;overflow:hidden;border-radius:999px;border:1px solid rgb(var(--c-teal)/.16);background:rgb(var(--c-cool-line)/.76);box-shadow:inset 0 1px 4px rgb(var(--c-ink-slate)/.12)}.practice-progress__track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,rgb(var(--c-teal)),rgb(var(--c-green)));box-shadow:0 0 12px rgb(var(--c-green)/.22);transition:width .42s cubic-bezier(.2,.8,.2,1)}.practice-board-meta{display:inline-flex;flex-wrap:wrap;gap:.35rem;align-items:center;margin-top:-.1rem;color:var(--muted);font-size:.96rem;font-weight:760}.practice-board-meta span+span:before{content:"•";margin-inline:0 .35rem;color:rgb(var(--c-ink-muted)/.7)}.practice-board-actions{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}.practice-board-actions .button{min-height:2.7rem;min-width:max-content;border-radius:.85rem;font-weight:850}.practice-board-actions .button--primary{min-width:min(100%,12rem)}.homework-review{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(20rem,.75fr);gap:1rem;align-items:start}.live-review-board{position:relative;width:min(100%,clamp(12rem,calc(100dvh - var(--board-vertical-reserve, 16.75rem)),var(--board-max-size,620px)));margin:0 auto}.live-review-board .editor-board-wrap{width:100%}.live-review-board__arrows{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:2}.live-review-board__arrow{stroke:currentColor;stroke-width:2.35;stroke-linecap:round;opacity:.78;filter:drop-shadow(0 4px 8px rgb(var(--c-ink)/.2))}.live-review-board__arrowhead{fill:rgb(var(--c-gold-deep-2))}.live-review-status{display:inline-flex;align-items:center;gap:.42rem;border:1px solid rgb(var(--c-slate)/.16);border-radius:999px;padding:.4rem .72rem;font-weight:850}.live-review-status--connected{background:rgb(var(--c-green-wash)/.9);color:rgb(var(--c-green-deep))}.live-review-status--connecting,.live-review-status--paused{background:rgb(var(--c-cool-wash-strong)/.9);color:var(--muted)}.live-review-participants{display:flex;flex-wrap:wrap;gap:.5rem}.live-review-participants span{display:inline-flex;border:1px solid rgb(var(--c-slate)/.14);border-radius:999px;background:rgb(var(--c-surface)/.76);color:var(--muted);font-weight:800;padding:.35rem .65rem}.practice-side{display:grid;gap:1rem}.practice-panel__title{display:inline-flex;align-items:center;gap:.7rem}.practice-info-panel{position:relative;overflow:hidden}.practice-info-panel:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgb(var(--c-teal)/.08),rgb(var(--c-surface)/0) 56%);pointer-events:none}.practice-info-panel--success{border-color:rgb(var(--c-green)/.22);background:rgb(var(--c-green-wash)/.72)}.practice-info-panel--error{border-color:rgb(var(--c-red-strong)/.22);background:rgb(var(--c-red-wash-2)/.78)}.practice-info-panel>*{position:relative;z-index:1}.practice-info-panel__mark{display:inline-flex;width:2.55rem;height:2.55rem;align-items:center;justify-content:center;border-radius:999px;background:rgb(var(--c-green-strong));color:rgb(var(--c-green-wash));box-shadow:0 14px 28px rgb(var(--c-green-strong)/.18)}.practice-info-panel__badge{display:inline-flex;align-items:center;gap:.42rem;border:1px solid rgb(var(--c-green)/.16);border-radius:999px;background:rgb(var(--c-green-pale)/.72);color:rgb(var(--c-green-deep));font-weight:850;padding:.36rem .68rem}.practice-info-body{display:grid;gap:.8rem}.practice-info-status{display:flex;flex-wrap:wrap;gap:.5rem}.practice-info-status span{display:inline-flex;min-height:2rem;align-items:center;border:1px solid rgb(var(--c-slate)/.14);border-radius:999px;background:rgb(var(--c-surface)/.72);color:var(--muted);font-size:.9rem;font-weight:800;padding:.35rem .7rem}.practice-info-copy{margin:0;border-radius:.85rem;font-weight:780;line-height:1.45;padding:.75rem .85rem}.practice-info-message{display:grid;gap:.45rem}.practice-info-message strong{color:rgb(var(--c-red-deep));font-size:.96rem;line-height:1.35}.practice-info-message p{margin:0;color:rgb(var(--c-red-deep-2));font-weight:760;line-height:1.45}.practice-info-message button{display:inline-flex;align-items:center;min-height:1.85rem;border:1px solid rgb(var(--c-red-strong)/.24);border-radius:999px;background:rgb(var(--c-surface)/.94);color:rgb(var(--c-red-deep));cursor:pointer;font-weight:900;padding:.2rem .7rem;box-shadow:0 8px 18px rgb(var(--c-red-deep-2)/.08)}.practice-info-message button:hover{background:rgb(var(--c-red-wash)/.92);transform:translateY(-1px)}.learner-practice__actions{display:flex;flex-wrap:wrap;gap:.65rem;align-items:center;justify-content:flex-start}.learner-practice__toolbar{justify-content:flex-start}.learner-practice__solved-badge{display:inline-flex;align-items:center;gap:.45rem;min-height:2.75rem;padding:.7rem .9rem;border-radius:.95rem;border:1px solid rgb(var(--c-green)/.24);background:rgb(var(--c-green-wash)/.86);color:rgb(var(--c-green-deep));cursor:default;font-weight:800;user-select:none}.learner-practice__workspace{display:grid;gap:1rem}.learner-practice__board-panel{align-content:start;gap:.9rem}.learner-practice__progress p{color:var(--muted);line-height:1.5}.learner-practice__submitted{position:relative;overflow:visible}.learner-practice__submitted-menu{position:absolute;transform:none}.learner-practice__submitted-tree{--submitted-success-bg:rgb(var(--c-green-pale)/0.68);--submitted-success-border:rgb(var(--c-green-strong)/0.28);--submitted-success-text:rgb(var(--c-green-deep))}.learner-practice__submitted-tree .move-pill{border-color:var(--submitted-success-border);background:var(--submitted-success-bg);color:var(--submitted-success-text)}.learner-practice__submitted-tree .variation-branch{border-left-color:rgb(var(--c-green-strong)/.18)}.learner-practice__submitted-tree .variation-branch__path,.learner-practice__submitted-tree .variation-move-token__label{color:var(--submitted-success-text)}.learner-practice--homepage .learner-practice__feedback{min-height:auto}.study-annotations{display:grid;gap:.55rem;margin:0;padding:0;list-style:none;max-height:22rem;overflow-y:auto}.study-annotations__item{display:grid;gap:.28rem;padding:.55rem .7rem;border-radius:14px;border:1px solid rgb(var(--c-slate)/.14);background:rgb(var(--c-cool-wash-2)/.94)}.study-annotations__item--active{border-color:rgb(var(--c-gold)/.45);background:rgb(var(--c-warm-wash-strong-2)/.9)}.study-annotations__move{justify-self:start;padding:0;border:0;background:none;font-weight:650;font-size:.9rem;color:var(--muted);cursor:pointer}.study-annotations__item--active .study-annotations__move{color:rgb(var(--c-bronze-strong))}.study-annotations__note{overflow-wrap:anywhere;font-size:.95rem}.study-annotations__note>:last-child{margin-bottom:0}.study-annotations__note h1,.study-annotations__note h2,.study-annotations__note h3,.study-annotations__note p,.study-annotations__note ul{margin:0 0 .5rem;font-size:inherit}.study-annotations__note ul{padding-left:1.2rem}.study-filters{display:grid;gap:1rem}.study-filters__actions{display:flex;flex-wrap:wrap;gap:.75rem}.study-card,.study-list{display:grid;gap:1rem}.study-card{padding:1.25rem}.study-card__header{display:flex;justify-content:space-between;gap:1rem;align-items:flex-start}.study-card__header h2{margin:0;font-size:1.2rem}.study-card__header p{margin:.35rem 0 0;color:var(--muted)}.tag-row{display:flex;flex-wrap:wrap;gap:.5rem}.tag-chip{display:inline-flex;padding:.35rem .65rem;border-radius:999px;background:rgb(var(--c-teal-wash-strong)/.75);color:rgb(var(--c-slate-deep-2));font-size:.85rem;font-weight:600}.study-meta{display:flex;flex-wrap:wrap;gap:.9rem;color:var(--muted);font-size:.95rem}.study-card__actions{display:flex;flex-wrap:wrap;gap:.75rem}.input-icon{position:relative;display:flex;align-items:center}.input-icon svg{position:absolute;left:.95rem;color:var(--muted);pointer-events:none}.input-icon input{padding-left:2.6rem}.study-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(17rem,1fr));gap:1.1rem}.study-tile{display:grid;grid-template-rows:auto 1fr;min-width:0;padding:0;overflow:hidden;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}.study-tile:hover{border-color:rgb(var(--c-gold)/.28);box-shadow:0 20px 44px rgb(var(--c-ink)/.12);transform:translateY(-2px)}.study-tile__banner{display:flex;align-items:center;gap:.9rem;min-width:0;padding:1rem 1.1rem;background:linear-gradient(135deg,rgb(var(--c-warm-wash)/.9),rgb(var(--c-parchment-mid-2)/.55));border-bottom:1px solid var(--border)}.study-tile__icon-avatar{display:inline-grid;width:3.6rem;height:3.6rem;flex-shrink:0;place-items:center;border-radius:.75rem}.study-tile__icon-avatar--blue{background:rgb(var(--c-blue-wash-strong)/.9);color:rgb(var(--c-blue))}.study-tile__icon-avatar--green{background:rgb(var(--c-green-pale)/.85);color:rgb(var(--c-green-soft))}.study-tile__icon-avatar--violet{background:rgb(var(--c-violet-pale)/.9);color:rgb(var(--c-violet))}.study-tile__icon-avatar--orange{background:rgb(var(--c-amber-wash-strong)/.9);color:rgb(var(--c-amber-strong))}.study-tile__icon-avatar--coral{background:rgb(var(--c-warm-wash-strong-3)/.95);color:rgb(var(--c-orange))}.study-tile__icon-avatar--sky{background:rgb(var(--c-blue-wash)/.95);color:rgb(var(--c-blue-soft))}.study-tile__icon-avatar--gold{background:rgb(var(--c-amber-wash-strong)/.9);color:rgb(var(--c-gold-strong))}.study-tile__banner-text{display:grid;gap:.15rem;min-width:0}.study-tile__banner-top{display:flex;align-items:center;justify-content:space-between;gap:.5rem;min-width:0}.study-tile__badges{display:flex;flex-direction:column;align-items:flex-end;gap:.3rem;flex-shrink:0}.study-tile__banner-top h2{margin:0;flex:1;min-width:0;overflow:hidden;font-size:1.02rem;text-overflow:ellipsis;white-space:nowrap}.study-tile__banner-text p{margin:0;color:var(--muted);font-size:.82rem;font-weight:700}.study-tile__body{display:grid;align-content:start;gap:.75rem;min-width:0;padding:1.1rem}.study-tile__desc{margin:0;overflow:hidden;color:var(--muted);font-size:.9rem;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.study-tile__meta{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1rem;color:var(--muted);font-size:.82rem;font-weight:700}.study-tile__meta span{display:inline-flex;align-items:center;gap:.35rem}.study-tile__actions{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:.15rem}.study-tile__icon-button{display:inline-grid;flex-shrink:0;width:2.35rem;height:2.35rem;place-items:center;border-radius:999px;border:1px solid rgb(var(--c-gold)/.18);background:rgb(var(--c-surface)/.7);color:var(--muted);cursor:pointer;transition:color .15s ease,border-color .15s ease,background-color .15s ease}.study-tile__icon-button:hover{border-color:rgb(var(--c-red)/.28);background:rgb(var(--c-red-wash)/.6);color:var(--danger)}.privacy-badge{display:inline-flex;flex-shrink:0;align-items:center;gap:.35rem;padding:.32rem .65rem;border-radius:999px;font-size:.76rem;font-weight:800;white-space:nowrap}.privacy-badge--public{background:rgb(var(--c-green-pale)/.85);color:rgb(var(--c-green-soft-2))}.privacy-badge--unlisted{background:rgb(var(--c-teal-wash-strong)/.82);color:rgb(var(--c-slate-deep-2))}.privacy-badge--invite-only{background:rgb(var(--c-violet-pale)/.9);color:rgb(var(--c-violet))}@keyframes studies-shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.study-editor-shell{display:grid;gap:1rem}.study-workspace{padding:1rem 0 2.5rem}.study-editor-v2{padding:1rem;display:grid;gap:1rem}.study-editor-v2__topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;flex-wrap:wrap}.study-editor-v2__heading{min-width:0;flex:1 1 420px;display:grid;gap:.45rem}.study-title-input{width:100%;border:0;outline:none;background:transparent;font-size:clamp(1.4rem,3vw,2.3rem);font-weight:800;letter-spacing:-.05em;padding:0}.study-title-input:focus{box-shadow:none}.study-editor-v2__meta{display:flex;flex-wrap:wrap;gap:.75rem;color:var(--muted);font-size:.95rem}.study-editor-v2__actions{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem}.study-editor-v2__heading h1{margin:0;overflow-wrap:anywhere}.study-invite-manager{display:grid;gap:.7rem}.live-study-manager{display:grid;gap:.75rem;max-width:100%;min-width:0}.live-study-manager__fields{display:grid;gap:.7rem}.live-study-manager__fields .field,.live-study-manager__fields input{min-width:0;width:100%}.live-study-manager__actions{display:flex;flex-wrap:wrap;gap:.55rem;align-items:center}.live-study-manager__actions .button{min-width:0;max-width:100%}.live-study-manager__actions .button--primary{flex:1 1 12rem}.live-study-manager__actions .button--secondary{flex:1 1 8rem}.live-study-manager__section{display:grid;gap:.55rem}.live-study-manager__section-header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.4rem;color:var(--foreground)}.live-study-manager__section-header small{color:var(--muted);font-weight:760}.live-study-manager__group{cursor:pointer;width:100%}.live-study-manager__group>small{color:var(--muted);font-weight:850}.live-study-manager__group--selected{border-color:rgb(var(--c-gold)/.45);background:rgb(var(--c-parchment-wash-5)/.86);box-shadow:inset 0 0 0 1px rgb(var(--c-gold)/.16)}.live-study-manager__group--selected>small{color:var(--accent-strong)}.study-invite-search{display:flex;align-items:center;gap:.55rem;padding:0 .9rem;border:1px solid rgb(var(--c-slate)/.2);border-radius:16px;background:rgb(var(--c-surface)/.9)}.study-invite-search input{border:0;border-radius:0;box-shadow:none;background:transparent;padding-left:0}.study-invite-list,.study-invite-results{display:grid;gap:.55rem}.study-invite-result,.study-invite-row{display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-height:3.2rem;padding:.7rem .8rem;border:1px solid rgb(var(--c-slate)/.18);border-radius:14px;background:rgb(var(--c-cool-wash-strong)/.82);text-align:left}.study-invite-result{cursor:pointer}.study-invite-result span,.study-invite-row span{min-width:0;display:grid;gap:.15rem}.study-invite-result small,.study-invite-result strong,.study-invite-row small,.study-invite-row strong{overflow-wrap:anywhere}.study-invite-result small,.study-invite-row small{color:var(--muted)}.study-editor-v2__desktop{display:none}.study-editor-v2__mobile{display:grid}.study-editor-topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;padding-bottom:.5rem}.study-editor-topbar strong{display:block;font-size:clamp(1.45rem,3vw,2.3rem);letter-spacing:-.05em}.study-editor-topbar__title{display:grid;gap:.2rem}.study-editor-desktop{display:none}.study-editor-mobile{display:grid;gap:1rem}.editor-board-wrap{width:min(100%,var(
      --board-fit-size,clamp(12rem,calc(100dvh - var(--board-vertical-reserve, 12rem)),var(--board-max-size,620px))
    ));margin:0 auto}.editor-main{--board-vertical-reserve:15.25rem;padding:1rem;display:grid;gap:1rem}.editor-main__toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem}.editor-main__status{display:flex;flex-wrap:wrap;gap:.75rem;color:var(--muted);font-size:.95rem}.board-editor{--board-vertical-reserve:20.5rem;display:grid;gap:1rem}.board-editor__workspace{display:grid;gap:.85rem}.board-editor__palette{min-width:0}.board-editor__palette-row{display:grid;grid-template-columns:repeat(13,minmax(0,2.55rem));justify-content:center;gap:clamp(.12rem,.7vw,.32rem)}.board-editor__piece{display:grid;place-items:center;min-width:0;aspect-ratio:1;border:1px solid rgb(var(--c-slate)/.18);border-radius:.62rem;background:rgb(var(--c-surface)/.8);color:var(--foreground);cursor:pointer;overflow:hidden;padding:.04rem;transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease}.board-editor__piece--active,.board-editor__piece:hover{border-color:rgb(var(--c-teal)/.28);background:rgb(var(--c-teal-wash)/.95);box-shadow:0 0 0 3px rgb(var(--c-teal)/.14)}.board-editor__piece:hover{transform:translateY(-1px)}.board-editor__piece svg{display:block;width:98%;height:98%}.board-editor__piece--tool svg{width:1.25rem;height:1.25rem}.board-editor__board{width:min(100%,clamp(12rem,calc(100dvh - var(--board-vertical-reserve)),var(--board-max-size,620px)))}.board-editor__controls{display:grid;gap:.8rem}.board-editor__tool-row{display:flex;align-items:center;justify-content:space-between;gap:.42rem;flex-wrap:nowrap;min-width:0}.board-editor__tool-spacer{flex:1 1 auto;min-width:.35rem}.board-editor__move-color svg{stroke-width:2.35}.board-editor__move-color--white svg{fill:rgb(var(--c-surface));stroke:rgb(var(--c-ink))}.board-editor__move-color--black svg{fill:rgb(var(--c-ink));stroke:rgb(var(--c-ink))}.board-editor__move-color--active{box-shadow:0 0 0 3px rgb(var(--c-gold)/.22),0 10px 22px rgb(var(--c-gold)/.16)}.board-editor__fen{align-items:center;display:grid;grid-template-columns:auto minmax(0,1fr);gap:.5rem .75rem;min-width:0}.board-editor__fen label{margin:0}.board-editor__fen-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.5rem;align-items:center}.board-editor__fen>p{grid-column:2;margin:0}.board-editor__fen-row input{font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:.88rem}.board-editor__actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.75rem}.editor-sidebar{display:grid;gap:1rem}.board-controls{display:flex;flex-wrap:wrap;justify-content:center;gap:.45rem;padding:.25rem}@media (max-height:760px){.editor-main,.practice-board-card{gap:.55rem;padding:.75rem}.editor-main{--board-vertical-reserve:12.25rem}.practice-board-card{--board-vertical-reserve:14.25rem}.board-editor{--board-vertical-reserve:17.5rem;gap:.65rem}.board-editor__workspace{gap:.55rem}.board-editor__palette-row{grid-template-columns:repeat(13,minmax(0,2.25rem))}.board-controls{gap:.28rem;padding:0}.board-controls .icon-button,.board-editor__fen-row .icon-button,.board-editor__tool-row .icon-button{width:2.25rem;height:2.25rem;border-radius:.65rem}.challenge-board-actions .button,.practice-board-actions .button{min-height:2.35rem;padding:.58rem .82rem}.challenge-board-actions,.editor-main__toolbar,.learner-practice__toolbar,.practice-board-actions{gap:.45rem}}.move-list{display:flex;flex-wrap:wrap;gap:.5rem}.move-table{display:grid;gap:.6rem}.study-tree{display:grid;gap:.7rem}.study-tree__section,.study-tree__variations,.variation-branch,.variation-branch__children{display:grid;gap:.5rem}.variation-branch{padding-left:calc(var(--variation-depth, 1) * .8rem);border-left:2px solid var(--variation-border,rgb(var(--c-gold)/.18))}.variation-branch__flow{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem .45rem}.variation-branch__title-row{display:inline-flex;flex-wrap:wrap;align-items:center;gap:.45rem}.variation-branch__path{color:var(--variation-accent,var(--primary-strong));font-size:.9rem;font-weight:700}.variation-branch__title{color:var(--muted);font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.03em}.variation-move-token{display:inline-flex;align-items:center;gap:.24rem;min-width:0}.variation-move-token__label{color:var(--variation-accent,var(--primary-strong));font-size:.82rem;font-weight:700;flex-shrink:0}.move-table__row{display:grid;grid-template-columns:2.5rem minmax(0,1fr) minmax(0,1fr);gap:.5rem;align-items:center}.move-table__number{color:var(--muted);font-weight:700;font-size:.92rem}.move-pill{border:1px solid rgb(var(--c-slate)/.16);background:rgb(var(--c-surface-cool)/.9);border-radius:.82rem;padding:.48rem .66rem;cursor:pointer;text-align:left;min-width:0;line-height:1.15}.move-pill--active{background:rgb(var(--c-parchment)/.88);color:rgb(var(--c-bronze-strong));border-color:rgb(var(--c-gold)/.26)}.markdown-preview{min-height:10rem;border:1px solid rgb(var(--c-slate)/.14);border-radius:18px;padding:1rem;background:rgb(var(--c-cool-wash-2)/.94);overflow-wrap:anywhere}.markdown-preview--empty{color:var(--muted)}.markdown-preview h1,.markdown-preview h2,.markdown-preview h3,.markdown-preview p,.markdown-preview ul{margin:0 0 .8rem}.markdown-preview ul{padding-left:1.2rem}.markdown-preview code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;background:rgb(var(--c-cool-line));padding:.1rem .35rem;border-radius:8px}.shortcut-grid{display:grid;gap:.75rem;margin-bottom:1rem}.shortcut-grid__row{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;color:var(--muted)}.shortcut-grid__row span:last-child{color:var(--foreground);font-weight:700;text-align:right}.content-editor{padding:.9rem;display:grid;gap:.85rem}.content-editor__topbar{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:.75rem}.content-editor__title{min-width:0;flex:1 1 360px;display:grid;gap:.35rem}.content-editor__title input{width:100%;border:0;background:transparent;font-size:clamp(1.35rem,3vw,2rem);font-weight:800;letter-spacing:-.04em;padding:0;outline:none}.content-editor__title span{color:var(--muted)}.content-editor__grid{display:grid;gap:1rem}.content-editor--embedded{padding:0;background:transparent;border:0;box-shadow:none}.content-editor--embedded .content-editor__topbar{padding:0}.content-editor--embedded .content-editor__grid{gap:.9rem}.study-editor-v2--embedded{padding:0;background:transparent;box-shadow:none;border:0}.study-editor-v2--embedded .study-editor-v2__topbar{padding:0}.study-editor-v2--embedded .study-editor-v2__desktop,.study-editor-v2--embedded .study-editor-v2__mobile{margin-top:.5rem}.study-editor-v2--embedded .study-editor-v2__desktop{grid-template-columns:minmax(0,1.42fr) minmax(300px,360px)}.study-editor-v2--embedded .editor-board-wrap{--board-max-size:680px}.board-announcement-rail{display:flex;align-items:center;justify-content:center;height:2.7rem;margin-top:-.15rem}.board-announcement-rail>.board-announcement{max-height:100%}.board-announcement{display:flex;align-items:center;gap:.6rem;min-width:0;max-width:100%;border:1px solid rgb(var(--c-ink)/.12);border-radius:.85rem;background:rgb(var(--c-cool-wash-strong)/.92);color:var(--muted);padding:.34rem .4rem .34rem .6rem;animation:board-announcement-in .32s cubic-bezier(.2,.9,.25,1) both}.board-announcement__body{display:flex;align-items:center;gap:.5rem;min-width:0;border:0;background:none;color:inherit;font:inherit;text-align:left;padding:0}.board-announcement__body--action{cursor:pointer}.board-announcement__mark{display:inline-flex;flex:none;align-items:center;justify-content:center;width:1.7rem;height:1.7rem;border-radius:999px;background:rgb(var(--c-surface)/.8);color:inherit;box-shadow:inset 0 0 0 1px rgb(var(--c-ink)/.08)}.board-announcement__text{display:flex;align-items:baseline;gap:.4rem;min-width:0}.board-announcement__text strong{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.95rem;font-weight:850;letter-spacing:-.01em}.board-announcement__text small{flex:none;font-size:.8rem;font-weight:700;opacity:.75}.board-announcement__action{display:inline-flex;flex:none;align-items:center;gap:.3rem;border:1px solid;border-radius:.65rem;background:rgb(var(--c-surface)/.72);color:inherit;font-size:.82rem;font-weight:850;padding:.3rem .6rem;cursor:pointer;transition:transform .14s ease,background .14s ease}.board-announcement__action:hover{transform:translateY(-1px);background:rgb(var(--c-surface)/.95)}.board-announcement--praise,.board-announcement--success{border-color:rgb(var(--c-green-strong)/.34);background:rgb(var(--c-green-wash)/.96);color:rgb(var(--c-green-deep))}.board-announcement--progress{border-color:rgb(var(--c-blue)/.26);background:rgb(var(--c-blue-wash-2)/.96);color:rgb(var(--c-blue-deep))}.board-announcement--progress .board-announcement__mark{background:rgb(var(--c-blue)/.12);box-shadow:inset 0 0 0 1px rgb(var(--c-blue)/.24);animation:board-announcement-tick .42s cubic-bezier(.2,.9,.25,1) both}@keyframes board-announcement-tick{0%{opacity:0;transform:scale(.6)}60%{opacity:1;transform:scale(1.12)}to{opacity:1;transform:scale(1)}}.board-announcement--alert,.board-announcement--prompt{border-color:rgb(var(--c-red)/.3);background:rgb(var(--c-red-wash-6)/.96);color:rgb(var(--c-red-mid))}.board-announcement--wrong{border-color:rgb(var(--c-red)/.45);background:rgb(var(--c-red-wash-7)/.97);color:rgb(var(--c-red))}.board-announcement--wrong .board-announcement__mark{background:rgb(var(--c-red)/.12);box-shadow:inset 0 0 0 1px rgb(var(--c-red)/.26)}.board-announcement--wrong .board-announcement__text strong{font-weight:900}.board-announcement--wrong .board-announcement__action{border-color:rgb(var(--c-red)/.55);background:rgb(var(--c-red));color:rgb(var(--c-red-wash-8))}.board-announcement--wrong .board-announcement__action:hover{background:rgb(var(--c-red-mid))}.board-announcement--coach,.board-announcement--warning{border-color:rgb(var(--c-gold)/.38);background:rgb(var(--c-parchment-wash-6)/.96);color:rgb(var(--c-bronze-strong))}.board-announcement--celebrating{box-shadow:0 10px 26px rgb(var(--c-green-strong)/.16)}.board-announcement--celebrating .board-announcement__mark{position:relative;z-index:2;background:rgb(var(--c-green-strong)/.16);box-shadow:inset 0 0 0 1px rgb(var(--c-green-strong)/.3);animation:board-announcement-cheer 1s cubic-bezier(.22,1,.3,1) both}.board-announcement--celebrating .board-announcement__text strong{animation:board-announcement-headline .62s cubic-bezier(.2,.9,.25,1) both}@keyframes board-announcement-in{0%{opacity:0;transform:translateY(.4rem)}to{opacity:1;transform:translateY(0)}}@keyframes board-announcement-headline{0%{opacity:0;transform:translateY(.35rem) scale(.94)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes board-announcement-cheer{0%{opacity:0;transform:scale(1.4) translateY(.35rem) rotate(-16deg)}18%{opacity:1;transform:scale(2.05) translateY(-.15rem) rotate(9deg)}40%{opacity:1;transform:scale(1.68) translateY(-.1rem) rotate(-5deg)}62%{transform:scale(1.45) translateY(-.08rem) rotate(2deg)}80%{transform:scale(1.32) translateY(0) rotate(0deg)}to{opacity:1;transform:scale(1.28) translateY(0) rotate(0deg)}}@media (prefers-reduced-motion:reduce){.board-announcement,.board-announcement--celebrating .board-announcement__mark,.board-announcement--celebrating .board-announcement__text strong{animation-duration:1ms}}.content-picker-search{display:flex;align-items:center;gap:.65rem;border:1px solid rgb(var(--c-slate)/.2);border-radius:16px;padding:0 .9rem;background:rgb(var(--c-surface)/.9)}.content-picker-search input{border:0;background:transparent;box-shadow:none;padding-left:0;padding-right:0}.content-picker-list{display:grid;gap:.6rem;max-height:min(20rem,46vh);overflow:auto}.content-picker-item{text-align:left;border:1px solid rgb(var(--c-slate)/.14);border-radius:18px;padding:.8rem .9rem;background:rgb(var(--c-cool-wash)/.88);display:grid;gap:.2rem;cursor:pointer}.content-picker-item span{color:var(--muted)}.content-picker-item--active{border-color:rgb(var(--c-teal-deep)/.26);background:rgb(var(--c-teal-wash-strong)/.72)}.content-versions-panel{padding:.78rem .9rem;min-height:0}.content-versions-panel--inline{padding:0}.content-versions-panel__row{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem .75rem}.content-versions-panel__row h2{margin:0;font-size:1.05rem}.content-versions-panel--inline .content-versions-panel__row{gap:.4rem}.content-versions-panel--inline .content-versions-panel__row h2{font-size:.92rem;color:var(--muted)}.content-versions-panel__select{flex:1 1 240px;min-width:min(100%,220px)}.content-versions-panel--inline .content-versions-panel__select{flex:0 1 13rem;min-width:9.5rem}.content-versions-panel__select select{width:100%;min-height:2.35rem;border:1px solid rgb(var(--c-slate)/.18);border-radius:14px;padding:.45rem .7rem;background:rgb(var(--c-cool-wash)/.9);color:var(--foreground);font-weight:650}.content-versions-panel--inline .content-versions-panel__select select{min-height:2.4rem;border-radius:999px;padding-inline:.85rem}.advanced-panel summary{cursor:pointer;font-weight:700;list-style:none}.advanced-panel summary::-webkit-details-marker{display:none}.advanced-panel[open] summary{margin-bottom:1rem}@media (min-width:768px){.learner-practice__workspace{grid-template-columns:minmax(0,1.1fr) minmax(300px,400px);align-items:start}.study-filters{grid-template-columns:2fr 1fr 1fr auto;align-items:end}.content-editor__grid{grid-template-columns:320px minmax(0,1fr);align-items:start}.study-editor-desktop{display:grid;grid-template-columns:220px minmax(0,1.35fr) 280px;gap:1rem;align-items:start}.editor-center{grid-template-rows:auto auto}.study-editor-mobile{display:none}}@media (max-width:767px){.practice-board-card__header{display:grid}.practice-progress-card{justify-items:stretch;width:100%;min-width:0}}@media (min-width:980px) and (max-width:1279px){.study-editor-v2{padding:1rem}.study-editor-v2__desktop{display:grid}.learner-practice__workspace,.study-editor-v2__desktop{grid-template-columns:minmax(0,1fr) minmax(280px,340px);gap:.9rem;align-items:start}.study-editor-v2__mobile{display:none}.editor-board-wrap{--board-max-size:520px}.editor-main{position:sticky;top:5.7rem}.study-editor-v2--embedded .study-editor-v2__desktop{grid-template-columns:minmax(0,1.3fr) minmax(280px,330px)}.study-editor-v2--embedded .editor-board-wrap{--board-max-size:560px}}@media (min-width:1280px){.study-editor-v2{padding:1.2rem}.study-editor-v2__desktop{display:grid}.learner-practice__workspace,.study-editor-v2__desktop{grid-template-columns:minmax(0,1.3fr) 380px;gap:1rem;align-items:start}.study-editor-v2__mobile{display:none}.editor-main{position:sticky;top:5.7rem}.study-editor-v2--embedded .study-editor-v2__desktop{grid-template-columns:minmax(0,1.42fr) 350px}.study-editor-v2--embedded .editor-board-wrap{--board-max-size:680px}}@media (max-width:767px){.board-announcement-rail{height:2.35rem;margin-top:0}.board-announcement{width:100%;min-width:0;gap:.4rem;border-radius:.6rem;padding:.28rem .3rem .28rem .45rem}.board-announcement__mark{width:1.5rem;height:1.5rem}.board-announcement__text strong{font-size:.85rem}.board-announcement__text small{display:none}.board-announcement__action{font-size:.78rem;padding:.26rem .5rem}.board-announcement__body{flex:1 1 auto}}