.ex-page{--ex-bg:hsl(220 40% 98%);--ex-card:hsl(0 0% 100%);--ex-ink:hsl(224 32% 19%);--ex-muted:hsl(221 13% 43%);--ex-line:hsl(220 24% 89%);--ex-blue:hsl(222 76% 48%);--ex-blue-soft:hsl(222 90% 96%);--ex-violet:hsl(261 55% 49%);--ex-violet-soft:hsl(260 85% 96%);--ex-mint:hsl(158 49% 32%);--ex-mint-soft:hsl(156 55% 94%);--ex-coral:hsl(15 68% 43%);--ex-coral-soft:hsl(18 90% 96%);--ex-gold:hsl(36 74% 35%);--ex-gold-soft:hsl(42 95% 94%);--ex-shadow:0 4px 20px hsl(222 35% 30% / .035);--tone:var(--ex-blue);--tone-soft:var(--ex-blue-soft);min-height:100dvh;background:var(--ex-bg);color:var(--ex-ink);font-family:ui-rounded,SF Pro Rounded,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.55;overflow-wrap:break-word}.dark .ex-page{--ex-bg:hsl(222 29% 11%);--ex-card:hsl(223 25% 15%);--ex-ink:hsl(220 35% 94%);--ex-muted:hsl(220 17% 70%);--ex-line:hsl(222 22% 25%);--ex-blue:hsl(219 93% 75%);--ex-blue-soft:hsl(222 39% 22%);--ex-violet:hsl(266 87% 80%);--ex-violet-soft:hsl(261 29% 22%);--ex-mint:hsl(155 55% 71%);--ex-mint-soft:hsl(157 29% 17%);--ex-coral:hsl(20 94% 77%);--ex-coral-soft:hsl(17 29% 20%);--ex-gold:hsl(42 84% 74%);--ex-gold-soft:hsl(39 28% 18%);--ex-shadow:0 4px 20px hsl(0 0% 0% / .08)}.ex-page *{box-sizing:border-box}.ex-page button,.ex-page input,.ex-page select{font:inherit}.ex-page button,.ex-page a,.ex-page input,.ex-page select{-webkit-tap-highlight-color:transparent;touch-action:manipulation}.ex-page button{cursor:pointer}.ex-page button:disabled{cursor:default;opacity:.5}.ex-page button:focus-visible,.ex-page a:focus-visible,.ex-page input:focus-visible,.ex-page select:focus-visible,.ex-page summary:focus-visible{outline:3px solid var(--ex-blue);outline-offset:4px}.ex-page svg{flex-shrink:0}.ex-container{width:min(100%,1360px);padding:0 max(24px,env(safe-area-inset-right)) max(64px,env(safe-area-inset-bottom)) max(24px,env(safe-area-inset-left));margin-inline:auto;min-width:0}.ex-page .ex-muted{color:var(--ex-muted)}.ex-tone-blue{--tone:var(--ex-blue);--tone-soft:var(--ex-blue-soft)}.ex-tone-coral{--tone:var(--ex-coral);--tone-soft:var(--ex-coral-soft)}.ex-tone-mint{--tone:var(--ex-mint);--tone-soft:var(--ex-mint-soft)}.ex-tone-violet{--tone:var(--ex-violet);--tone-soft:var(--ex-violet-soft)}.ex-tone-amber{--tone:var(--ex-gold);--tone-soft:var(--ex-gold-soft)}.ex-page .ex-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:11px 21px;border:1px solid transparent;border-radius:13px;font-size:14px;font-weight:650;text-decoration:none;transition:transform .18s ease,background .18s ease,box-shadow .18s ease;max-width:100%;text-align:center}.ex-page .ex-button:hover:not(:disabled){transform:translateY(-2px)}.ex-page .ex-button-primary{background:#1e57dc;color:#fff;box-shadow:0 4px #1640a2}.ex-page .ex-button-primary:hover:not(:disabled){background:#1b4ec5}.ex-page .ex-button-secondary{background:var(--ex-card);color:var(--ex-ink);border-color:var(--ex-line)}.ex-page .ex-button-next{background:var(--ex-blue-soft);color:var(--ex-blue);border-color:transparent}.ex-page .ex-eyebrow{display:flex;align-items:center;gap:7px;font-size:11px;font-weight:750;letter-spacing:.12em;color:var(--ex-blue);margin:0 0 12px}.ex-hero{display:grid;grid-template-columns:1.35fr 1fr;align-items:center;gap:30px;padding:60px 44px 50px;margin:24px 0 44px;background:var(--ex-blue-soft);border-radius:30px;position:relative;isolation:isolate}.ex-hero-copy{max-width:660px;min-width:0}.ex-page .ex-hero h1{font-size:clamp(1.9rem,3.25vw,2.95rem);font-weight:780;line-height:1.16;letter-spacing:-.045em;margin:0 0 20px}.ex-hero h1 span{color:var(--ex-blue)}.ex-hero-description{max-width:500px;font-size:16px;line-height:1.8;color:var(--ex-muted);margin:0}.ex-hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:24px;margin-top:26px}.ex-hero-secondary{display:inline-flex;align-items:center;gap:5px;color:var(--ex-ink);font-size:14px;font-weight:600;min-height:44px}.ex-hero-points{display:flex;flex-wrap:wrap;gap:17px;margin-top:25px;font-size:12px;color:var(--ex-muted)}.ex-hero-points span{display:flex;align-items:center;gap:5px}.ex-hero-points svg{color:var(--ex-mint)}.ex-playground-art{height:290px;max-width:420px;position:relative;isolation:isolate;width:100%;margin:auto}.ex-art-orbit{position:absolute;width:240px;height:240px;border-radius:50%;background:var(--ex-violet-soft);left:50%;top:13px;transform:translate(-50%);border:16px solid var(--ex-card)}.ex-art-book{position:absolute;left:50%;top:40px;transform:translate(-50%) rotate(-8deg);width:148px;height:165px;border-radius:14px 21px 16px 14px;background:#8fdcbd;box-shadow:inset 10px 0 #4cb88f,5px 8px #2b644f26}.ex-art-book-line{position:absolute;left:22px;top:18px;width:92px;height:5px;border-radius:8px;background:#ddf3ea}.ex-art-eyes{position:absolute;display:flex;gap:32px;left:42px;top:65px}.ex-art-eyes span{width:10px;height:14px;background:#273249;border-radius:50%}.ex-art-smile{position:absolute;top:86px;left:64px;width:22px;height:14px;border-bottom:4px solid hsl(220 30% 22%);border-radius:0 0 20px 20px}.ex-art-cheek{position:absolute;top:88px;width:17px;height:9px;border-radius:50%;background:#fbb49d}.ex-art-cheek-left{left:30px}.ex-art-cheek-right{right:24px}.ex-art-book-bottom{position:absolute;bottom:8px;left:15px;right:0;height:11px;background:#fdfaec;border-radius:8px 0 0 8px}.ex-art-words{position:absolute;left:50%;bottom:15px;transform:translate(-50%) rotate(5deg);display:flex;gap:8px;white-space:nowrap}.ex-art-words span{padding:12px 19px;border-radius:12px;background:var(--ex-card);box-shadow:0 5px 0 var(--ex-line);font-weight:750;color:var(--ex-blue);font-size:20px;border:1px solid var(--ex-line)}.ex-art-words span:nth-child(2){color:var(--ex-violet);transform:translateY(-9px)}.ex-art-words span:nth-child(3){color:var(--ex-coral)}.ex-art-card{position:absolute;display:flex;gap:7px;align-items:center;padding:10px 13px;background:var(--ex-card);border:1px solid var(--ex-line);border-radius:13px;font-size:12px;font-weight:650;box-shadow:var(--ex-shadow)}.ex-art-card-one{top:20px;right:-4px;transform:rotate(9deg)}.ex-art-check{background:var(--ex-mint-soft);color:var(--ex-mint);width:22px;height:22px;display:grid;place-items:center;border-radius:50%}.ex-art-card-two{left:-6px;top:160px;transform:rotate(-9deg);color:var(--ex-violet)}.ex-art-spark{position:absolute;font-size:36px;color:var(--ex-gold);line-height:1}.ex-art-spark-one{left:35px;top:35px}.ex-art-spark-two{right:12px;top:135px;font-size:47px;color:var(--ex-coral)}.ex-art-star{position:absolute;top:6px;left:50%;color:var(--ex-gold);font-size:29px;transform:rotate(12deg)}.ex-section-intro{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:28px;scroll-margin-top:100px}.ex-section-intro h2{font-size:25px;font-weight:740;letter-spacing:-.025em;margin:0}.ex-section-intro .ex-eyebrow{margin-bottom:6px;color:var(--ex-muted)}.ex-personal-progress{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ex-mint)}.ex-directory-layout{display:grid;grid-template-columns:235px minmax(0,1fr);align-items:start;gap:30px}.ex-category-panel{position:sticky;top:105px;padding:20px 14px;background:var(--ex-card);border:1px solid var(--ex-line);border-radius:19px}.ex-category-panel h2{font-size:13px;font-weight:700;margin:0 10px 12px}.ex-category-list{display:grid;gap:3px}.ex-category-list button{min-height:44px;width:100%;display:flex;justify-content:space-between;align-items:center;gap:7px;padding:9px 10px;background:transparent;border:0;border-radius:10px;font-size:12px;color:var(--ex-muted);text-align:left}.ex-category-list button>span:last-child{font-size:11px;font-variant-numeric:tabular-nums;min-width:20px;text-align:center}.ex-category-list button[aria-pressed=true]{background:var(--ex-blue-soft);color:var(--ex-blue);font-weight:700}.ex-category-list button:hover{background:var(--ex-blue-soft)}.ex-category-name{display:flex;align-items:center;gap:9px;min-width:0}.ex-category-name svg{width:17px;height:17px;color:var(--tone)}.ex-guides-link{display:block;margin:18px 8px 0;padding-top:18px;border-top:1px solid var(--ex-line);font-size:12px;color:var(--ex-muted)}.ex-guides-link span{display:flex;align-items:center;gap:4px;margin-top:6px;font-weight:600;color:var(--ex-blue)}.ex-directory-main{min-width:0}.ex-filters{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.ex-search{flex:1 1 300px;display:flex;align-items:center;gap:10px;min-width:0;min-height:50px;padding:0 14px;border:1px solid var(--ex-line);border-radius:12px;background:var(--ex-card);color:var(--ex-muted)}.ex-search input{width:100%;min-width:0;height:48px;background:transparent;color:var(--ex-ink);border:0;font-size:14px;outline-offset:0}.ex-search input::-moz-placeholder{color:var(--ex-muted);opacity:1}.ex-search input::placeholder{color:var(--ex-muted);opacity:1}.ex-search button{display:grid;place-items:center;width:44px;min-height:44px;flex-shrink:0;border:0;background:transparent;color:var(--ex-muted)}.ex-filter-selects{display:flex;gap:8px}.ex-filter-selects select{height:50px;min-width:0;max-width:100%;padding:0 28px 0 12px;background:var(--ex-card);border:1px solid var(--ex-line);border-radius:12px;color:var(--ex-ink);font-size:13px}.ex-results-line{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px;color:var(--ex-muted);padding:13px 0 21px;min-height:50px}.ex-results-line p{margin:0}.ex-results-line button{min-height:44px;display:flex;align-items:center;gap:4px;background:transparent;border:0;color:var(--ex-blue)}.ex-topic-group{margin-bottom:35px}.ex-group-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:15px}.ex-group-title{display:flex;align-items:center;gap:11px}.ex-group-title h2{font-size:18px;font-weight:730;letter-spacing:-.02em;margin:0}.ex-group-title p{font-size:12px;color:var(--ex-muted);margin:2px 0 0}.ex-group-icon{display:grid;place-items:center;width:41px;height:41px;background:var(--tone-soft);color:var(--tone);border-radius:12px;flex-shrink:0}.ex-group-icon svg{width:21px;height:21px}.ex-count-badge{font-size:11px;white-space:nowrap;padding:4px 9px;border-radius:20px;background:var(--ex-card);color:var(--ex-muted);border:1px solid var(--ex-line)}.ex-topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.ex-topic-card{position:relative;display:flex;flex-direction:column;min-width:0;padding:19px 18px 15px;border:1px solid var(--ex-line);border-radius:16px;background:var(--ex-card);box-shadow:var(--ex-shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;min-height:209px;text-decoration:none}.ex-topic-card:hover{transform:translateY(-4px);border-color:var(--tone);box-shadow:0 7px 22px #32426714}.ex-topic-top{display:flex;justify-content:space-between;align-items:center;gap:7px;margin-bottom:18px}.ex-topic-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:var(--tone-soft);color:var(--tone)}.ex-topic-icon svg{width:18px;height:18px}.ex-level{display:inline-flex;align-items:center;font-size:10px;line-height:1.4;font-weight:650;background:var(--ex-bg);color:var(--ex-muted);padding:5px 8px;border-radius:7px;white-space:nowrap}.ex-topic-card h3{font-size:16px;line-height:1.4;font-weight:720;letter-spacing:-.015em;margin:0 0 9px;color:var(--ex-ink)}.ex-card-formats{font-size:11px;line-height:1.7;color:var(--ex-muted);margin:0 0 16px}.ex-card-formats>span{font-weight:700;color:var(--ex-ink)}.ex-activity-note{font-size:12px;line-height:1.5;color:var(--ex-muted);margin:9px 0 0}.ex-topic-bottom{display:flex;align-items:center;justify-content:space-between;gap:6px;margin-top:auto;font-size:10px;color:var(--ex-muted)}.ex-topic-bottom>span:first-child{display:flex;align-items:center;gap:5px;flex-wrap:wrap}.ex-start-arrow{display:grid;place-items:center;width:30px;height:30px;flex-shrink:0;background:var(--tone-soft);color:var(--tone);border-radius:50%}.ex-card-progress{height:3px;position:absolute;bottom:0;left:14px;right:14px;background:var(--ex-line);border-radius:8px;overflow:hidden}.ex-card-progress span{display:block;height:100%;background:var(--ex-mint)}.ex-empty,.ex-restored-guide{margin:65px auto;padding:40px 24px;text-align:center;max-width:650px;min-width:0}.ex-empty>svg{margin:0 auto 15px;color:var(--ex-blue)}.ex-empty h1,.ex-restored-guide h1{font-size:clamp(1.5rem,3vw,2.3rem);font-weight:750;line-height:1.25;margin:15px 0}.ex-empty h3{font-size:20px;font-weight:700}.ex-empty p,.ex-restored-guide>p{color:var(--ex-muted);margin:12px 0 23px}.ex-restored-guide .ex-eyebrow{justify-content:center}.ex-restored-back{display:flex;justify-content:center;align-items:center;gap:7px;min-height:44px;margin-top:24px;color:var(--ex-blue);font-size:13px}.ex-loading{padding:80px 0;max-width:850px;margin:auto;text-align:center;color:var(--ex-muted)}.ex-loading-dot{width:20px;height:20px;background:var(--ex-blue);border-radius:50%;display:block;margin:0 auto 15px;animation:ex-breathe 1.2s ease-in-out infinite alternate}.ex-loading-card{height:280px;background:var(--ex-blue-soft);border-radius:22px;margin-top:30px}.ex-practice{max-width:1160px;margin:0 auto;padding:27px 0}.ex-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:11px;color:var(--ex-muted);font-size:12px;margin-bottom:24px}.ex-breadcrumb a{display:flex;align-items:center;gap:6px;min-height:44px;color:var(--ex-blue);font-weight:600}.ex-practice-header{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:32px}.ex-practice-header>div{min-width:0}.ex-practice-header h1{font-size:clamp(1.6rem,3vw,2.4rem);line-height:1.23;letter-spacing:-.035em;font-weight:760;margin:12px 0}.ex-practice-header p{font-size:14px;color:var(--ex-muted);margin:0}.ex-practice-eyebrow{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:11px;color:var(--ex-muted)}.ex-practice-eyebrow .ex-level{background:var(--tone-soft);color:var(--tone);font-size:11px}.ex-practice-category-icon{display:grid;place-items:center;flex-shrink:0;width:76px;height:76px;border-radius:24px;background:var(--tone-soft);color:var(--tone);transform:rotate(7deg)}.ex-practice-category-icon svg{width:35px;height:35px}.ex-practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}.ex-workspace{min-width:0}.ex-round-progress{margin-bottom:20px}.ex-round-progress>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--ex-muted);margin-bottom:11px}.ex-round-progress>div:first-child>span:first-child{display:flex;align-items:center;gap:6px;color:var(--ex-blue);font-weight:650}.ex-progress-track{height:8px;border-radius:20px;background:var(--ex-line);overflow:hidden}.ex-progress-track>span{height:100%;display:block;background:var(--ex-blue);border-radius:inherit;transition:width .3s ease}.ex-question-card{position:relative;padding:28px;background:var(--ex-card);border:1px solid var(--ex-line);border-radius:22px;box-shadow:var(--ex-shadow);min-height:360px;scroll-margin-top:105px;overflow:hidden}.ex-question-meta{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:25px;font-size:12px;font-weight:600}.ex-format-badge{display:inline-flex;align-items:center;gap:6px;border-radius:8px;padding:6px 9px;color:var(--tone);background:var(--tone-soft);font-size:11px}.ex-question-card h2{font-size:22px;font-weight:730;line-height:1.4;letter-spacing:-.02em;margin:0 0 25px}.ex-question-card h2:focus{outline:none}.ex-fill-area{margin-top:3px}.ex-fill-sentence{display:flex;align-items:center;flex-wrap:wrap;gap:6px 9px;font-size:21px;line-height:1.85;font-weight:500}.ex-fill-sentence span{min-width:0;max-width:100%}.ex-fill-sentence input{border:2px solid var(--ex-line);border-radius:11px;background:var(--ex-bg);color:var(--ex-ink);padding:8px 10px;min-height:51px;max-width:100%;font-size:19px;line-height:1.4;text-align:center;transition:border-color .15s ease}.ex-fill-sentence input:focus{border-color:var(--ex-blue)}.ex-fill-sentence input::-moz-placeholder{color:var(--ex-muted);font-size:15px;opacity:1}.ex-fill-sentence input::placeholder{color:var(--ex-muted);font-size:15px;opacity:1}.ex-input-hint{display:flex;align-items:center;gap:6px;flex-wrap:wrap;color:var(--ex-muted);font-size:12px;margin:16px 0}.ex-question-sentence{font-size:21px;line-height:1.85;margin:0 0 22px;font-weight:500}.ex-inline-gap{display:inline-block;min-width:38px;border-bottom:2px solid var(--ex-blue);color:var(--ex-blue);text-align:center;padding:0 5px;margin:0 5px}.ex-answer-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;margin:12px 0}.ex-answer-option{display:flex;align-items:center;gap:11px;min-width:0;padding:14px;min-height:59px;background:var(--ex-card);color:var(--ex-ink);border:2px solid var(--ex-line);border-radius:13px;text-align:left;transition:border-color .15s ease,background .15s ease}.ex-answer-option>span:nth-child(2){flex:1;min-width:0;overflow-wrap:anywhere}.ex-answer-option[aria-pressed=true]{background:var(--ex-blue-soft);border-color:var(--ex-blue);color:var(--ex-blue)}.ex-option-letter{display:grid;place-items:center;width:27px;height:27px;flex-shrink:0;border-radius:7px;background:var(--ex-bg);font-size:11px;color:var(--ex-muted);font-weight:700}.ex-answer-option[aria-pressed=true] .ex-option-letter{background:var(--ex-blue);color:var(--ex-bg)}.ex-answer-option:hover{border-color:var(--ex-blue)}.ex-feedback-space{margin-top:23px;min-height:12px}.ex-feedback{display:flex;align-items:flex-start;gap:11px;padding:16px;border-radius:13px;font-size:13px;line-height:1.75;animation:ex-feedback-pop .2s ease-out}.ex-feedback>svg{margin-top:2px}.ex-feedback strong{font-size:14px;font-weight:700;display:block;margin-bottom:3px}.ex-feedback p{margin:0}.ex-feedback-hint{background:var(--ex-gold-soft);color:var(--ex-gold)}.ex-feedback-correct{background:var(--ex-mint-soft);color:var(--ex-mint)}.ex-feedback-reveal{background:var(--ex-violet-soft);color:var(--ex-violet)}.ex-feedback .ex-revealed-answer{font-weight:650;margin:4px 0 7px;color:var(--ex-ink)}.ex-assisted-note{display:block;margin-top:9px;font-size:11px}.ex-question-actions{display:flex;align-items:center;flex-wrap:wrap;gap:11px;padding-top:23px;margin-top:8px;border-top:1px solid var(--ex-line)}.ex-question-actions .ex-button{font-size:13px;padding:10px 15px}.ex-retry{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;border:0;background:transparent;color:var(--ex-muted);font-size:12px;padding:9px 5px;margin-left:auto}.ex-question-navigation{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:20px}.ex-question-navigation>span{font-size:11px;color:var(--ex-muted);text-align:center}.ex-all-questions{margin-top:26px;border-top:1px solid var(--ex-line);font-size:13px}.ex-all-questions summary{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:50px;cursor:pointer;color:var(--ex-muted);list-style:none}.ex-all-questions summary::-webkit-details-marker{display:none}.ex-all-questions ol{display:grid;gap:8px;margin-top:10px;padding:0;list-style:none}.ex-all-questions li button{width:100%;min-height:44px;display:flex;gap:12px;text-align:left;border:0;background:var(--ex-card);color:var(--ex-ink);border-radius:10px;padding:10px 12px}.ex-all-questions li button>span{color:var(--ex-blue);min-width:22px}.ex-all-questions li button:hover{background:var(--ex-blue-soft)}.ex-trail{border:1px solid var(--ex-line);background:var(--ex-card);border-radius:20px;padding:22px}.ex-trail-title{display:flex;align-items:center;gap:10px;margin-bottom:20px}.ex-trail-star{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--ex-gold-soft);color:var(--ex-gold);flex-shrink:0}.ex-trail-title h2{font-size:13px;font-weight:700;margin:0 0 2px}.ex-trail-title p{font-size:11px;margin:0;color:var(--ex-muted)}.ex-step-legend{display:flex;gap:13px;font-size:10px;color:var(--ex-muted);margin-bottom:21px}.ex-step-legend>span{display:flex;align-items:center;gap:5px}.ex-step-legend i{display:inline-block;width:7px;height:7px;border-radius:50%}.ex-legend-solved{background:var(--ex-mint)}.ex-legend-help{background:var(--ex-violet)}.ex-trail-round{margin-bottom:17px}.ex-trail-round h3{font-size:11px;font-weight:600;color:var(--ex-muted);margin-bottom:8px}.ex-trail-round>div{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}.ex-trail-round button{display:grid;place-items:center;min-width:0;min-height:44px;border:1px solid var(--ex-line);border-radius:10px;background:var(--ex-bg);color:var(--ex-muted);font-size:12px;font-weight:600}.ex-trail-round button[data-state=solved]{background:var(--ex-mint-soft);color:var(--ex-mint);border-color:transparent}.ex-trail-round button[data-state=help]{background:var(--ex-violet-soft);color:var(--ex-violet);border-color:transparent}.ex-trail-round button[data-state=incorrect]{background:var(--ex-gold-soft);color:var(--ex-gold)}.ex-trail-round button[aria-current=step]{outline:2px solid var(--ex-blue);outline-offset:1px;color:var(--ex-blue)}.ex-check-all{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;min-height:44px;border:1px solid var(--ex-line);border-radius:11px;background:var(--ex-card);color:var(--ex-ink);font-size:12px;font-weight:600;margin-top:8px}.ex-save-note{font-size:10px;color:var(--ex-muted);line-height:1.6;text-align:center;margin:11px 0 0}.ex-encouragement{background:var(--ex-gold-soft);border-radius:17px;padding:21px;margin-top:18px}.ex-encouragement>span{font-size:28px;line-height:1;color:var(--ex-gold)}.ex-encouragement h2{font-size:16px;font-weight:700;line-height:1.55;margin:6px 0 8px}.ex-encouragement p{font-size:12px;color:var(--ex-muted);margin:0}.ex-guide-card{display:flex;align-items:flex-start;gap:10px;margin-top:20px;font-size:11px;color:var(--ex-muted);padding:0 5px;min-height:50px}.ex-guide-card>svg{color:var(--ex-blue);margin-top:2px}.ex-guide-card strong{display:flex;align-items:center;gap:4px;font-size:12px;color:var(--ex-blue);margin-top:3px}.ex-reset-area{margin-top:17px;text-align:center;font-size:11px;color:var(--ex-muted)}.ex-reset-area>button{display:inline-flex;align-items:center;gap:5px;min-height:44px;padding:7px;border:0;background:transparent;color:var(--ex-muted)}.ex-reset-area>p{margin:8px 0}.ex-order-sentence{display:flex;align-items:center;flex-wrap:wrap;gap:9px;font-size:20px;line-height:1.75;margin:22px 0}.ex-word-slots{display:flex;flex-wrap:wrap;gap:7px;min-width:0;max-width:100%;padding:10px;background:var(--ex-blue-soft);border-radius:14px}.ex-word-slot{min-width:50px;min-height:47px;border:1px dashed var(--ex-line);border-radius:10px;background:var(--ex-card);color:var(--ex-muted);padding:7px 10px;font-size:15px}.ex-word-slot.is-filled{border-style:solid;border-color:var(--ex-blue);color:var(--ex-blue);font-weight:650;animation:ex-tile-snap .18s ease-out}.ex-word-slot>span{opacity:.65}.ex-word-bank,.ex-sort-words{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin:17px 0;min-height:48px}.ex-word-tile{display:flex;align-items:center;gap:5px;min-height:47px;max-width:100%;padding:10px 15px;border:1px solid var(--ex-line);border-bottom-width:3px;border-radius:11px;background:var(--ex-card);color:var(--ex-ink);font-size:15px;font-weight:600}.ex-word-tile>svg{color:var(--ex-muted)}.ex-word-tile[aria-pressed=true]{background:var(--ex-blue-soft);border-color:var(--ex-blue);color:var(--ex-blue)}.ex-word-group{font-size:9px;padding:3px 6px;border-radius:6px;background:var(--ex-blue-soft);color:var(--ex-blue);font-weight:400}.ex-matching{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:20px 0 13px}.ex-matching>div{display:grid;gap:10px}.ex-match-item{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;min-height:56px;padding:11px;border:2px solid var(--ex-line);border-radius:12px;background:var(--ex-card);color:var(--ex-ink);text-align:left;font-size:13px;overflow-wrap:anywhere}.ex-match-item[aria-pressed=true]{background:var(--ex-blue-soft);border-color:var(--ex-blue);color:var(--ex-blue)}.ex-match-item.is-correct{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-match-number{display:grid;place-items:center;flex-shrink:0;width:22px;height:22px;border-radius:6px;background:var(--ex-blue-soft);color:var(--ex-blue);font-size:10px}.ex-match-paired{color:var(--ex-blue)}.ex-small-note{font-size:11px;color:var(--ex-muted);margin:12px 0}.ex-sort-buckets{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}.ex-sort-bucket{display:flex;flex-direction:column;align-items:flex-start;gap:13px;min-height:125px;border:2px dashed var(--ex-line);border-radius:14px;background:var(--ex-mint-soft);color:var(--ex-ink);padding:17px;text-align:left;overflow-wrap:anywhere}.ex-sort-bucket.ex-bucket-1{background:var(--ex-violet-soft)}.ex-sort-bucket.ex-bucket-2{background:var(--ex-gold-soft)}.ex-bucket-heading{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;font-weight:650;max-width:100%}.ex-sort-bucket>span:last-child{color:var(--ex-muted);font-size:12px}.ex-error-sentence{display:flex;flex-wrap:wrap;gap:6px;font-size:18px;line-height:1.6;margin:24px 0}.ex-error-sentence button{min-height:45px;border:1px solid var(--ex-line);border-radius:9px;padding:6px 10px;background:var(--ex-bg);color:var(--ex-ink);text-align:left;max-width:100%}.ex-error-sentence button[aria-pressed=true]{background:var(--ex-gold-soft);color:var(--ex-gold);border-color:var(--ex-gold)}.ex-correction-options{margin-top:24px}.ex-correction-options>p{font-size:13px;color:var(--ex-muted);margin-bottom:11px}.ex-judge-options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.ex-judge-options button{display:flex;justify-content:center;align-items:center;gap:8px;min-height:59px;padding:12px;border:2px solid var(--ex-line);border-radius:13px;background:var(--ex-card);color:var(--ex-ink);font-size:14px;font-weight:600}.ex-judge-options button[aria-pressed=true]{background:var(--ex-blue-soft);color:var(--ex-blue);border-color:var(--ex-blue)}.ex-picture{background:var(--ex-blue-soft);border-radius:16px;padding:18px;margin:0 0 24px;text-align:center}.ex-emoji-scene{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:14px;font-size:clamp(2.5rem,6vw,4rem);min-height:100px;line-height:1.3}.ex-picture figcaption{font-size:12px;color:var(--ex-muted);margin-top:10px}.ex-position-picture svg{width:100%;max-width:330px;max-height:190px;display:block;margin:auto}.ex-scene-ground{fill:var(--ex-line)}.ex-scene-table{fill:#c79260}.ex-scene-ball{fill:#f17f55}.ex-scene-ball-shine{fill:#ffc5a8}.ex-scene-box{fill:#79a1ec}.ex-scene-box-top{fill:#2c59b5}.ex-scene-box-front{fill:#79a1ec}.ex-comparison{display:flex;align-items:flex-end;justify-content:center;gap:25px;min-height:160px}.ex-comparison>div{display:flex;align-items:center;flex-direction:column;gap:7px;font-size:12px;min-width:45px}.ex-comparison-track{height:130px;width:46px;display:flex;align-items:flex-end}.ex-comparison-track>span{width:100%;min-height:6px;border-radius:10px 10px 3px 3px;background:var(--ex-blue)}.ex-comparison>div:nth-child(2) .ex-comparison-track>span{background:var(--ex-violet)}.ex-comparison>div:nth-child(3) .ex-comparison-track>span{background:var(--ex-coral)}.ex-finish-card{background:var(--ex-card);border:1px solid var(--ex-line);border-radius:22px;padding:35px 26px;text-align:center}.ex-finish-icon{display:grid;place-items:center;width:72px;height:72px;background:var(--ex-gold-soft);color:var(--ex-gold);border-radius:24px;margin:0 auto 22px;transform:rotate(-7deg)}.ex-finish-icon svg{width:33px;height:33px}.ex-finish-card .ex-eyebrow{justify-content:center}.ex-finish-card h2{font-size:27px;font-weight:760;letter-spacing:-.03em;line-height:1.3;margin:12px 0}.ex-finish-card>p{color:var(--ex-muted);font-size:13px}.ex-score-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:28px 0}.ex-score-grid>div{background:var(--ex-mint-soft);border-radius:14px;padding:17px 8px}.ex-score-grid>div:nth-child(2){background:var(--ex-violet-soft)}.ex-score-grid>div:nth-child(3){background:var(--ex-gold-soft)}.ex-score-grid strong{display:block;font-size:30px;font-weight:750;line-height:1.4}.ex-score-grid span{display:block;font-size:10px;color:var(--ex-muted);margin-top:4px}.ex-finish-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}.ex-finish-card .ex-score-note{font-size:10px;margin-top:20px}.ex-confetti{position:absolute;left:50%;top:20%;pointer-events:none}.ex-confetti span{position:absolute;width:9px;height:9px;border-radius:2px;background:var(--spark-color);animation:ex-celebrate .85s ease-out forwards}@keyframes ex-breathe{0%{transform:scale(.85);opacity:.65}to{transform:scale(1.1);opacity:1}}@keyframes ex-feedback-pop{0%{transform:translateY(3px)}to{transform:translateY(0)}}@keyframes ex-tile-snap{0%{transform:translateY(-4px)}to{transform:translateY(0)}}@keyframes ex-celebrate{0%{transform:translate(0) rotate(0);opacity:1}to{transform:translate(var(--spark-x),var(--spark-y)) rotate(170deg);opacity:0}}.ex-page[data-embedded=true] .ex-container{padding-top:max(8px,env(safe-area-inset-top))}.ex-page[data-embedded=true] .ex-breadcrumb{margin-bottom:10px}.ex-page[data-embedded=true] .ex-hero{margin-top:8px}.ex-page[data-embedded=true] .ex-practice{padding-top:0}@media (min-width:1500px){.ex-hero{padding-inline:58px}.ex-playground-art{max-width:420px}.ex-topic-grid{gap:18px}.ex-topic-card{padding:22px}}@media (max-width:1150px){.ex-directory-layout{grid-template-columns:210px minmax(0,1fr);gap:22px}.ex-topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ex-hero{padding:35px 30px;gap:20px}.ex-art-card-one{right:0}.ex-art-card-two{left:0}.ex-playground-art{max-width:340px}.ex-practice-layout{gap:22px;grid-template-columns:minmax(0,1fr) 280px}.ex-trail{padding:18px}.ex-trail-round>div{gap:4px}.ex-question-card{padding:24px}.ex-question-actions{gap:8px}.ex-retry{margin-left:0}}@media (max-width:900px){.ex-practice-layout{grid-template-columns:minmax(0,1fr)}.ex-practice-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:16px}.ex-trail{grid-row:span 3}.ex-encouragement,.ex-guide-card,.ex-reset-area{margin-top:0}.ex-question-card{padding:28px;min-height:340px}.ex-directory-layout{grid-template-columns:minmax(0,1fr)}.ex-category-panel{position:static;padding:14px}.ex-category-panel h2,.ex-guides-link{display:none}.ex-category-list{display:flex;flex-wrap:wrap;gap:6px}.ex-category-list button{width:auto;border:1px solid var(--ex-line);border-radius:10px;padding:8px 11px;min-height:44px}.ex-category-list button>span:last-child{display:none}.ex-category-name{gap:6px}.ex-category-name svg{width:15px;height:15px}.ex-topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.ex-hero{grid-template-columns:1.3fr 1fr}.ex-hero-description{font-size:14px}.ex-playground-art{height:260px}.ex-art-book{width:125px;height:145px;top:39px}.ex-art-orbit{width:210px;height:210px}.ex-art-eyes{left:34px;gap:27px;top:57px}.ex-art-smile{top:80px;left:52px}.ex-art-cheek{top:77px}.ex-art-words{bottom:20px}.ex-art-words span{padding:10px 14px;font-size:17px}.ex-art-card{font-size:10px}.ex-art-card-one{top:15px;right:-3px}.ex-art-card-two{top:154px;left:-4px}.ex-art-spark-one{left:7px}.ex-art-spark-two{right:-8px}.ex-hero-actions{gap:14px}.ex-hero-points{gap:10px;font-size:10px}.ex-hero-secondary{font-size:12px}}@media (max-width:680px){.ex-container{padding-inline:max(17px,env(safe-area-inset-left));padding-bottom:max(40px,env(safe-area-inset-bottom))}.ex-hero{grid-template-columns:1fr;padding:28px 24px 25px;margin-top:17px;margin-bottom:30px;border-radius:23px;gap:22px}.ex-page .ex-hero h1{font-size:clamp(1.8rem,6.2vw,2.4rem)}.ex-hero-copy{max-width:100%}.ex-playground-art{max-width:290px;height:245px}.ex-art-card-one{right:0}.ex-art-card-two{left:0;top:151px}.ex-art-spark-two{right:0}.ex-art-orbit{top:5px}.ex-art-book{top:28px}.ex-art-words{bottom:6px}.ex-hero-points{font-size:11px;gap:12px;margin-top:20px}.ex-hero-actions{gap:15px;margin-top:23px}.ex-hero-actions .ex-button{font-size:13px;padding-inline:16px}.ex-section-intro{margin-bottom:18px;align-items:flex-start}.ex-section-intro h2{font-size:21px}.ex-section-intro .ex-eyebrow{font-size:9px}.ex-personal-progress{font-size:10px;max-width:110px}.ex-directory-layout{gap:20px}.ex-category-panel{padding:10px}.ex-category-list{gap:5px}.ex-category-list button{font-size:11px;padding:8px;min-height:44px}.ex-category-name{gap:5px}.ex-topic-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.ex-topic-card{padding:15px 13px;min-height:205px;border-radius:14px}.ex-topic-card h3{font-size:15px}.ex-topic-top{flex-wrap:wrap;margin-bottom:13px;gap:9px}.ex-level{font-size:9px}.ex-card-formats{font-size:10px}.ex-topic-bottom{font-size:9px}.ex-topic-bottom>span:first-child{max-width:100px}.ex-start-arrow{width:27px;height:27px}.ex-group-title h2{font-size:17px}.ex-group-title p{font-size:11px}.ex-count-badge{font-size:10px}.ex-search{flex-basis:100%;padding-inline:12px}.ex-search input{font-size:16px}.ex-filter-selects{width:100%}.ex-filter-selects label{flex:1;min-width:0}.ex-filter-selects select{width:100%;font-size:14px;height:47px}.ex-practice{padding-top:13px}.ex-breadcrumb{margin-bottom:13px;font-size:11px;gap:7px}.ex-practice-header{margin-bottom:23px;gap:12px;align-items:flex-start}.ex-practice-header h1{font-size:clamp(1.55rem,5.4vw,2rem);margin:11px 0;line-height:1.3}.ex-practice-header p{font-size:12px}.ex-practice-category-icon{width:48px;height:48px;border-radius:15px;margin-top:5px}.ex-practice-category-icon svg{width:24px;height:24px}.ex-practice-eyebrow{gap:8px;font-size:10px}.ex-question-card{padding:23px 20px;border-radius:18px;scroll-margin-top:85px}.ex-question-card h2{font-size:20px;margin-bottom:23px}.ex-question-meta{margin-bottom:21px;font-size:10px}.ex-format-badge{font-size:10px}.ex-question-sentence{font-size:19px;line-height:1.85}.ex-fill-sentence{font-size:19px}.ex-fill-sentence input{font-size:18px;min-height:49px}.ex-answer-option{padding:12px 11px;gap:8px;font-size:14px;min-height:55px}.ex-option-letter{width:23px;height:23px;font-size:10px}.ex-feedback{padding:13px;font-size:12px;gap:8px}.ex-feedback strong{font-size:13px}.ex-feedback-space{margin-top:19px}.ex-question-actions{gap:8px;padding-top:20px}.ex-question-actions .ex-button{font-size:12px;padding:10px 12px}.ex-question-navigation .ex-button{min-height:44px;padding:9px 14px;font-size:12px}.ex-question-navigation>span{font-size:10px}.ex-input-hint{font-size:11px}.ex-practice-sidebar{grid-template-columns:1fr 1fr;gap:13px}.ex-trail{padding:17px}.ex-trail-round>div{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.ex-encouragement{padding:17px}.ex-encouragement h2{font-size:14px}.ex-encouragement p{font-size:11px}.ex-trail-title h2{font-size:12px}.ex-trail-title{gap:7px}.ex-trail-star{width:29px;height:29px;border-radius:9px}.ex-step-legend{font-size:9px;gap:9px}.ex-matching{gap:10px}.ex-match-item{padding:10px 8px;font-size:12px;gap:5px}.ex-match-number{width:19px;height:19px;font-size:9px}.ex-word-tile{font-size:14px;padding-inline:11px}.ex-sort-bucket{padding:13px;min-height:120px}.ex-bucket-heading{font-size:12px}.ex-judge-options{gap:9px}.ex-judge-options button{font-size:12px;gap:6px;padding:10px 7px}.ex-judge-options svg{width:17px}.ex-error-sentence{font-size:16px}.ex-picture{padding:13px}.ex-emoji-scene{min-height:85px}.ex-score-grid{gap:8px}.ex-finish-card{padding:28px 19px}.ex-finish-card h2{font-size:24px}.ex-score-grid strong{font-size:26px}.ex-score-grid span{font-size:9px}.ex-finish-actions .ex-button{font-size:12px}.ex-restored-guide{padding-inline:6px}.ex-empty{padding-inline:8px}}@media (max-width:420px){.ex-container{padding-inline:max(14px,env(safe-area-inset-left))}.ex-hero{padding:25px 19px 22px}.ex-page .ex-hero h1{font-size:1.8rem}.ex-hero-description{font-size:13px}.ex-hero-points{gap:8px;font-size:10px}.ex-hero-actions{gap:8px;flex-wrap:wrap}.ex-hero-secondary{font-size:11px}.ex-playground-art{height:240px;max-width:260px}.ex-topic-grid{grid-template-columns:minmax(0,1fr)}.ex-topic-card{min-height:180px;padding:17px}.ex-topic-top{flex-wrap:nowrap}.ex-topic-card h3{font-size:17px}.ex-card-formats{font-size:11px}.ex-topic-bottom{font-size:10px}.ex-topic-bottom>span:first-child{max-width:none}.ex-topic-top{margin-bottom:12px}.ex-category-list button{font-size:10px}.ex-category-name svg{width:13px;height:13px}.ex-category-list{gap:4px}.ex-group-title{gap:8px}.ex-group-title h2{font-size:16px}.ex-group-icon{width:34px;height:34px;border-radius:10px}.ex-group-icon svg{width:18px;height:18px}.ex-group-title p{font-size:10px}.ex-section-intro h2{font-size:20px}.ex-practice-category-icon{display:none}.ex-practice-header h1{font-size:1.6rem}.ex-question-card{padding:19px 16px}.ex-question-meta{gap:6px}.ex-format-badge{padding:5px 7px;font-size:9px}.ex-question-actions{display:grid;grid-template-columns:1fr}.ex-question-actions .ex-button{width:100%;font-size:14px}.ex-retry{margin:0;font-size:12px}.ex-question-navigation>span{display:none}.ex-answer-options{grid-template-columns:1fr}.ex-answer-option{font-size:15px;min-height:51px}.ex-fill-sentence,.ex-question-sentence{font-size:18px}.ex-practice-sidebar{grid-template-columns:1fr}.ex-trail{grid-row:auto;padding:19px}.ex-trail-round>div{grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}.ex-encouragement{display:none}.ex-trail-title h2{font-size:14px}.ex-step-legend{font-size:10px;gap:12px}.ex-save-note{font-size:11px}.ex-guide-card{padding:7px 3px}.ex-reset-area{margin-top:0}.ex-order-sentence{font-size:18px}.ex-word-slots{gap:6px;padding:8px}.ex-word-slot{min-width:45px;padding:7px 8px;font-size:14px}.ex-score-grid{grid-template-columns:1fr}.ex-score-grid>div{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 15px}.ex-score-grid span{font-size:12px;margin:0}.ex-score-grid strong{font-size:26px}.ex-sort-words{gap:7px}.ex-word-tile{padding:8px 10px}.ex-word-group{font-size:8px}.ex-sort-buckets{gap:8px}.ex-sort-bucket{padding:11px}.ex-matching{gap:9px}.ex-matching .ex-match-item{flex-wrap:wrap}.ex-question-navigation{gap:8px}.ex-count-badge{font-size:9px;padding:4px 7px}}.ex-mobile-category,.ex-quick-jump{display:none}.ex-answer-controls{border:0;padding:0;margin:0;min-width:0}.ex-answer-option[data-result=revealed]{position:relative}.ex-option-answer-label{position:absolute;top:-10px;right:12px;font-size:10px;font-weight:700;white-space:nowrap;padding:3px 6px;border-radius:5px;background:var(--ex-violet);color:var(--ex-card)}.ex-answer-controls[data-result=revealed] button:disabled{opacity:1;cursor:default}.ex-answer-controls[data-result=revealed] .ex-input-hint{display:none}.ex-answer-option[data-result=revealed],.ex-answer-controls[data-result=revealed] .ex-fill-sentence input,.ex-answer-controls[data-result=revealed] .ex-inline-gap,.ex-answer-controls[data-result=revealed] .ex-word-slot,.ex-answer-controls[data-result=revealed] .ex-match-item,.ex-answer-controls[data-result=revealed] .ex-sort-bucket,.ex-answer-controls[data-result=revealed] .ex-word-group,.ex-answer-controls[data-result=revealed] .ex-judge-options button[aria-pressed=true]{background:var(--ex-violet-soft);border-color:var(--ex-violet);color:var(--ex-violet)}.ex-answer-controls[data-result=revealed] .ex-fill-slot{background:var(--ex-violet-soft);border-color:var(--ex-violet);color:var(--ex-violet);font-weight:700}.ex-answer-option[data-result=revealed] .ex-option-letter{background:var(--ex-violet);color:var(--ex-card)}.ex-answer-controls[data-result=correct] .ex-fill-slot,.ex-answer-controls[data-result=correct] .ex-inline-gap{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-answer-controls .ex-blank-word-option[data-result=revealed]{background:var(--ex-violet-soft);border-color:var(--ex-violet);color:var(--ex-violet);font-weight:700}.ex-answer-controls .ex-blank-word-option[data-result=correct]{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint);font-weight:700}.ex-answer-controls .ex-blank-word-option[data-result=incorrect]{background:var(--ex-gold-soft);border-color:var(--ex-gold);color:var(--ex-gold)}.ex-solution-word{padding:2px 5px;border-radius:5px;background:var(--ex-violet);color:var(--ex-card);font-weight:700;box-decoration-break:clone;-webkit-box-decoration-break:clone}.ex-page nav[aria-label="Main navigation"] a[aria-current=page]{background:var(--ex-blue-soft);color:var(--ex-blue);border-color:var(--ex-blue)}.ex-page nav[aria-label="Main navigation"]>a{min-height:44px}.ex-answer-option[data-result=correct]{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-answer-option[data-result=incorrect]{background:var(--ex-gold-soft);border-color:var(--ex-gold);color:var(--ex-gold)}.ex-task-instruction{padding:12px 14px;background:var(--ex-blue-soft);border-left:3px solid var(--ex-blue);border-radius:0 10px 10px 0;color:var(--ex-ink);font-size:14px;line-height:1.6;margin:0 0 22px}.ex-blank-word-bank{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin:0 0 22px;font-size:13px;color:var(--ex-muted)}.ex-blank-word-bank>span:first-child{font-weight:700;margin-right:2px;color:var(--ex-ink)}.ex-blank-word-option{min-height:44px;padding:8px 15px;border:2px solid var(--ex-line);border-radius:12px;background:var(--ex-card);color:var(--ex-ink);font-size:15px;font-weight:650;cursor:pointer;box-shadow:0 2px 0 var(--ex-line);transition:transform .15s ease,border-color .15s ease,background .15s ease,box-shadow .15s ease}.ex-blank-word-option:hover{transform:translateY(-2px);border-color:var(--ex-blue);box-shadow:0 4px 0 var(--ex-blue-soft)}.ex-blank-word-option:focus-visible,.ex-fill-slot:focus-visible{outline:3px solid var(--ex-blue);outline-offset:3px}.ex-blank-word-option[aria-pressed=true]{background:var(--ex-blue-soft);border-color:var(--ex-blue);color:var(--ex-blue)}.ex-blank-word-option[data-result=correct]{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-fill-sentence{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 7px;margin:0;font-size:21px;line-height:1.85;font-weight:500}.ex-fill-sentence>span{min-width:0;max-width:100%}.ex-fill-slot{display:inline-flex;align-items:center;justify-content:center;vertical-align:baseline;min-width:56px;max-width:100%;min-height:38px;padding:0 6px;border:0;border-bottom:2px dashed var(--ex-blue);border-radius:0;background:transparent;color:var(--ex-blue);font:inherit;font-weight:700;line-height:1.35;overflow-wrap:anywhere;cursor:pointer}.ex-fill-slot.is-filled{border-bottom-style:solid;border-radius:6px 6px 2px 2px;background:var(--ex-blue-soft);padding-inline:9px}.ex-feedback-space:empty{min-height:0;margin-top:0}.ex-match-item:disabled{opacity:.7}.ex-match-item.is-correct:disabled{opacity:1}.ex-finish-card h2{scroll-margin-top:105px}.ex-finish-card h2:focus{outline:none}.ex-question-actions .ex-button-primary:active:not(:disabled){transform:translateY(2px);box-shadow:0 2px #1640a2}@media (max-width:900px){.ex-category-panel{display:none}.ex-mobile-category{display:flex;flex-direction:column;gap:8px;margin-bottom:14px;font-size:12px;font-weight:600;color:var(--ex-muted)}.ex-mobile-category select,.ex-quick-jump select{min-height:48px;min-width:0;width:100%;border:1px solid var(--ex-line);border-radius:12px;padding:10px 35px 10px 13px;background:var(--ex-card);color:var(--ex-ink);font-size:16px}.ex-quick-jump{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px;font-size:12px;color:var(--ex-muted)}.ex-quick-jump select{width:auto;max-width:65%;font-size:14px;min-height:44px}.ex-topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:680px){.ex-level,.ex-format-badge{font-size:11px}.ex-question-meta,.ex-practice-eyebrow{font-size:12px}.ex-input-hint,.ex-small-note{font-size:13px}.ex-feedback{font-size:14px}.ex-feedback strong{font-size:15px}.ex-card-formats{font-size:12px}.ex-topic-bottom{font-size:11px}.ex-topic-card h3{font-size:17px}.ex-practice-header p,.ex-match-item{font-size:14px}.ex-question-card{scroll-margin-top:82px}.ex-page[data-embedded=true] .ex-question-card{scroll-margin-top:16px}}@media (max-width:520px){.ex-topic-grid{grid-template-columns:minmax(0,1fr)}.ex-topic-card{min-height:175px}.ex-topic-top{flex-wrap:nowrap;margin-bottom:12px}.ex-topic-bottom>span:first-child{max-width:none}.ex-question-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px 6px}.ex-question-actions .ex-button-primary{grid-column:1/-1;font-size:15px;min-height:50px}.ex-question-actions .ex-button-secondary{font-size:13px}.ex-question-actions .ex-retry{margin:0;font-size:13px}.ex-hero{padding-bottom:22px;gap:14px}.ex-playground-art{height:190px;max-width:250px}.ex-art-orbit{width:170px;height:170px;top:0;border-width:11px}.ex-art-book{top:15px;width:110px;height:125px}.ex-art-book-line{width:75px}.ex-art-eyes{top:45px;left:30px;gap:22px}.ex-art-smile{top:68px;left:44px}.ex-art-cheek{top:68px}.ex-art-card-two{top:103px;left:0}.ex-art-card-one{top:4px;right:0}.ex-art-words{bottom:0;gap:6px}.ex-art-words span{padding:7px 13px;font-size:16px}.ex-art-spark-two{top:95px;font-size:32px}.ex-section-intro{margin-bottom:16px}.ex-blank-word-bank{font-size:12px;gap:6px;margin-bottom:18px}}@media (max-width:360px){.ex-question-actions .ex-button-secondary>svg{display:none}}@media (prefers-reduced-motion:reduce){.ex-page *,.ex-page *:before,.ex-page *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.ex-confetti{display:none}.ex-topic-card:hover,.ex-page .ex-button:hover:not(:disabled){transform:none}}@media print{.ex-page .web-only,.ex-practice-sidebar,.ex-question-actions,.ex-question-navigation{display:none}.ex-practice-layout,.ex-all-questions{display:block}.ex-page{--ex-bg:hsl(0 0% 100%);--ex-ink:hsl(0 0% 0%);background:var(--ex-bg);color:var(--ex-ink)}}.ex-category-panel{max-height:calc(100vh - 130px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--ex-line) transparent}@supports (height:100dvh){.ex-category-panel{max-height:calc(100dvh - 130px)}}.ex-correction-fill input{width:min(100%,320px);min-height:52px;border:2px solid var(--ex-line);border-radius:11px;background:var(--ex-bg);color:var(--ex-ink);padding:9px 12px;font-size:17px}.ex-correction-fill input:focus{border-color:var(--ex-blue);outline:2px solid var(--ex-blue-soft)}.ex-answer-option[data-result=correct],.ex-judge-options button[data-result=correct]{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-answer-option[data-result=correct] .ex-option-letter{background:var(--ex-mint);color:var(--ex-card)}.ex-answer-option[data-result=incorrect],.ex-judge-options button[data-result=incorrect]{background:var(--ex-coral-soft);border-color:var(--ex-coral);color:var(--ex-coral)}.ex-answer-option[data-result=incorrect] .ex-option-letter{background:var(--ex-coral);color:var(--ex-card)}.ex-answer-controls[data-result=correct] .ex-correction-fill input{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint);-webkit-text-fill-color:var(--ex-mint);font-weight:700}.ex-answer-controls[data-result=revealed] .ex-correction-fill input{background:var(--ex-violet-soft);border-color:var(--ex-violet);color:var(--ex-violet);-webkit-text-fill-color:var(--ex-violet);font-weight:700}.ex-answer-controls[data-result=incorrect] .ex-correction-fill input{background:var(--ex-coral-soft);border-color:var(--ex-coral);color:var(--ex-coral);-webkit-text-fill-color:var(--ex-coral)}.ex-answer-flash{animation:ex-correct-flash .8s ease-out}.ex-answer-controls[data-result=correct] .ex-word-slot{background:var(--ex-mint-soft);border-color:var(--ex-mint);color:var(--ex-mint)}.ex-word-group[data-result=correct]{background:var(--ex-mint-soft);color:var(--ex-mint)}.ex-word-group[data-result=incorrect]{background:var(--ex-coral-soft);color:var(--ex-coral)}.ex-correct-answer-note{margin-top:9px;padding-top:9px;border-top:1px solid var(--ex-line);color:var(--ex-ink);font-size:12px;line-height:1.7}.ex-correct-answer-note>strong{display:inline;font-size:12px;margin:0 5px 0 0}.ex-correct-answer-note .ex-solution-word{background:var(--ex-mint);color:var(--ex-card)}@keyframes ex-correct-flash{0%{box-shadow:0 0 #30a6796b;transform:scale(1)}38%{box-shadow:0 0 0 5px #30a6792e;transform:scale(1.025)}to{box-shadow:0 0 #30a67900;transform:scale(1)}}.ex-topic-card--pending:not(.ex-topic-card--revealed){opacity:0;transform:translate3d(0,14px,0) scale(.985)}.ex-topic-card--entering{animation:ex-topic-card-arrive .44s cubic-bezier(.2,.75,.25,1) var(--ex-reveal-delay,0ms) both;will-change:transform,opacity}@keyframes ex-topic-card-arrive{0%{opacity:0;transform:translate3d(0,14px,0) scale(.985)}72%{opacity:1;transform:translate3d(0,-2px,0) scale(1.005)}to{opacity:1;transform:translateZ(0) scale(1)}}.ex-page,.dark .ex-page{--ex-bg:hsl(var(--learning-surface));--ex-card:hsl(var(--card));--ex-ink:hsl(var(--foreground));--ex-line:hsl(var(--border));--ex-shadow:var(--learning-shadow)}.ex-page :is(h1,h2,h3,.ex-eyebrow){letter-spacing:0}.ex-hero{background:transparent;border-radius:0;border-bottom:1px solid var(--ex-line);padding:40px 20px 36px;margin:0 0 32px;grid-template-columns:minmax(0,1.6fr) minmax(220px,1fr)}.ex-page .ex-hero h1{font-size:42px;line-height:1.2;letter-spacing:0}.ex-teacher-art{display:flex;justify-content:center;align-items:center;min-width:0}.ex-teacher-art img{width:270px;max-width:100%;height:auto;-o-object-fit:contain;object-fit:contain;animation:ex-teacher-float 5s ease-in-out infinite}.ex-hero-description{font-size:16px;line-height:1.7}.ex-page .ex-button{border-radius:8px}.ex-page .ex-button-primary{background:hsl(var(--primary));color:hsl(var(--primary-foreground));box-shadow:none}.ex-page .ex-button-primary:hover:not(:disabled){background:hsl(var(--primary) / .9)}.ex-category-panel{border:0;border-right:1px solid var(--ex-line);border-radius:0;background:transparent;padding:4px 16px 16px 0}.ex-category-list button{font-size:13px;border-radius:8px}.ex-topic-card{border-radius:8px;padding:22px;min-height:225px}.ex-topic-card h3{font-size:18px;line-height:1.4}.ex-card-formats{font-size:12px}.ex-topic-bottom{font-size:12px;padding-top:12px;border-top:1px solid var(--ex-line)}.ex-level{font-size:11px}.ex-search,.ex-filter-selects select,.ex-mobile-category select{border-radius:8px}.ex-activity-note{display:none}.ex-group-title h2{font-size:20px}.ex-group-title p{font-size:13px}@keyframes ex-teacher-float{0%,to{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-9px) rotate(2deg)}}@media (max-width:900px){.ex-page .ex-hero h1{font-size:34px}.ex-hero{padding-inline:0;gap:20px}.ex-teacher-art img{width:220px}}@media (max-width:680px){.ex-hero{grid-template-columns:minmax(0,1fr) 100px;padding:28px 0 24px;gap:10px;align-items:start}.ex-page .ex-hero h1{font-size:28px;margin-bottom:14px}.ex-hero-copy{display:contents}.ex-hero-copy>:is(.ex-eyebrow,.ex-hero-description,.ex-hero-actions,.ex-hero-points){grid-column:1/-1}.ex-hero-copy h1{grid-row:2;grid-column:1}.ex-teacher-art{grid-row:2;grid-column:2}.ex-teacher-art img{width:100px}.ex-hero-description{font-size:15px}.ex-hero-actions{margin-top:8px;gap:18px}.ex-hero-points{margin-top:12px;font-size:12px}.ex-topic-card{min-height:190px;padding:20px}.ex-group-title p{font-size:12px}}@media (prefers-reduced-motion:reduce){.ex-teacher-art img{animation:none}}
