:root{font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html{min-width:320px;min-height:100%}#root{min-height:100vh}:root{--ink: #24313f;--muted: #66717d;--cream: #f7f3eb;--paper: #fffdf9;--line: #ded7cc;--line-strong: #cfc5b8;--navy: #1f3d57;--coral: #df6b55;--coral-dark: #b94f3d;--coral-soft: #faece8;--blue: #2f7ca8;--blue-soft: #e8f1f6;--mustard: #d99a2b;--mustard-dark: #a97418;--mustard-soft: #fbf3e3;--teal: #269688;--teal-dark: #1d746a;--teal-soft: #e6f3f1;--success: #2f7f57;--success-soft: #edf7f1;--danger: #b94f4f;--danger-soft: #fff0ee;--shadow: 0 10px 28px rgba(55, 47, 37, .08)}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0;color:var(--ink);background-color:var(--cream);background-image:linear-gradient(rgba(91,78,60,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(91,78,60,.045) 1px,transparent 1px);background-size:28px 28px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input{font:inherit}.app-layout{display:grid;grid-template-columns:320px minmax(0,920px);align-items:start;justify-content:center;gap:22px;width:min(1280px,calc(100% - 32px));margin:24px auto 40px}.app,.sound-selector{border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.app{width:100%;min-width:0;padding:30px;overflow:hidden;background:#fffdf9f7}.eyebrow,.section-kicker,.feedback-kicker{margin:0 0 7px;color:var(--mustard-dark);font-size:12px;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.sound-selector{position:sticky;top:16px;max-height:calc(100vh - 32px);padding:21px;overflow-y:auto;background:#fffdf9f7}.selector-heading{text-align:center}.selector-heading h2{margin:0;font-size:21px}.selector-count{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:14px;padding:11px 13px;background:var(--mustard-soft);border:1px solid rgba(217,154,43,.22);border-radius:12px}.selector-count strong{color:var(--mustard-dark);font-size:24px}.selector-count span,.selector-question-count{color:var(--muted);font-size:12px}.selector-question-count{margin:8px 0 0}.selector-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}.selector-actions button,.clear-history-button{padding:9px 11px;color:var(--ink);background:var(--paper);border:1px solid var(--line-strong);border-radius:9px;cursor:pointer;font-size:13px;font-weight:750}.selector-actions button:hover,.clear-history-button:hover{border-color:var(--mustard);background:var(--mustard-soft)}.selection-warning{margin:14px 0 0;padding:10px;color:#91433d;background:var(--danger-soft);border:1px solid #efc9c4;border-radius:9px;font-size:13px;text-align:center}.sound-group{margin-top:23px}.sound-group h3{display:flex;align-items:center;gap:9px;margin:0 0 10px;color:var(--muted);font-size:13px;letter-spacing:.09em;text-transform:uppercase}.sound-group h3:after{content:"";height:1px;flex:1;background:var(--line)}.sound-group h3 small{display:inline-flex;min-width:25px;height:22px;align-items:center;justify-content:center;color:#fff;background:var(--navy);border-radius:999px;font-size:10px}.sound-checkbox-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.sound-checkbox{position:relative;display:grid;min-height:51px;place-items:center;padding:7px 4px;background:#fff;border:1px solid var(--line);border-radius:10px;cursor:pointer}.sound-checkbox:hover{border-color:var(--blue)}.sound-checkbox input{position:absolute;width:1px;height:1px;opacity:0}.sound-checkmark{position:absolute;top:4px;right:5px;display:inline-flex;width:16px;height:16px;align-items:center;justify-content:center;color:transparent;background:#f5f1ea;border:1px solid var(--line-strong);border-radius:5px;font-size:9px;font-weight:900}.sound-checkbox-active{background:var(--blue-soft);border-color:#2f7ca86b}.sound-checkbox-active .sound-checkmark{color:#fff;background:var(--blue);border-color:var(--blue)}.sidebar-symbol{font-family:Segoe UI,Arial Unicode MS,sans-serif;font-size:18px;font-weight:850}.pronunciation-note{margin:22px 0 0;padding:11px;color:var(--muted);background:#f6f2eb;border:1px dashed var(--line-strong);border-radius:10px;font-size:11px;line-height:1.45;text-align:center}.app-header{display:flex;justify-content:space-between;align-items:flex-start;gap:24px}.app-header h1{margin:0;font-size:clamp(30px,4vw,42px);line-height:1.06;letter-spacing:-.035em}.app-header p:not(.eyebrow){max-width:650px;margin:10px 0 0;color:var(--muted);line-height:1.55}.score{display:grid;min-width:100px;padding:11px 15px;color:#fff;background:var(--navy);border-radius:13px;text-align:center}.score-label{color:#ffffffb8;font-size:10px;font-weight:850;letter-spacing:.12em;text-transform:uppercase}.score-value{margin-top:2px;font-size:25px;line-height:1}.score-value span{color:#ffffffad;font-size:15px}.question-card{position:relative;margin-top:26px;padding:18px;overflow:hidden;color:#fff;background:linear-gradient(135deg,#193750,#235477 62%,#337ca4);border-radius:18px}.question-card-header{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between}.question-card-label,.question-number{color:#ffffffc2;font-size:11px;font-weight:850;letter-spacing:.1em;text-transform:uppercase}.question-number{padding:7px 9px;background:#ffffff1c;border-radius:999px}.word-stage{position:relative;z-index:2;display:flex;min-height:190px;align-items:center;justify-content:center;margin-top:14px;padding:30px 36px;overflow:hidden;background:#ffffff14;border:1px solid rgba(255,255,255,.13);border-radius:14px}.word-decoration{position:absolute}.decoration-one{width:74px;height:74px;top:-28px;left:-24px;border:2px solid rgba(255,255,255,.12);border-radius:18px;transform:rotate(18deg)}.decoration-two{width:90px;height:90px;right:-32px;bottom:-38px;background:#d99a2b29;border-radius:28px;transform:rotate(22deg)}.word{position:relative;z-index:2;margin:0;font-size:clamp(46px,8vw,76px);font-weight:780;letter-spacing:.02em;text-align:center}.target-letters{color:#fff7dd;text-decoration-color:#f2b847;text-decoration-line:underline;text-decoration-thickness:5px;text-underline-offset:8px}.question-prompt{position:relative;z-index:2;margin:14px 0 0;color:#ffffffbd;font-size:13px;text-align:center}.answer-section{margin-top:28px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:15px}.section-heading h2{margin:0;font-size:23px}.section-help{max-width:330px;margin:0;color:var(--muted);font-size:13px;text-align:right}.answer-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.answer-button{min-height:66px;padding:12px;color:var(--ink);background:#fff;border:1px solid var(--line-strong);border-radius:12px;cursor:pointer;font-family:Segoe UI,Arial Unicode MS,sans-serif;font-size:25px;font-weight:850}.answer-button:hover:not(:disabled){border-color:var(--blue)}.answer-button.selected{color:#fff;background:var(--blue);border-color:var(--blue)}.answer-button.correct-choice{color:#215e42;background:var(--success-soft);border-color:#6bad8a}.answer-button.incorrect-choice{color:#8f3e3e;background:var(--danger-soft);border-color:#d98b83}.answer-button:disabled{cursor:default}.action-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.main-button,.secondary-button{width:100%;padding:13px 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var(--line)}.history-header{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:17px}.history-header h2{margin:0;font-size:24px}.history-header p:not(.section-kicker){margin:6px 0 0;color:var(--muted);font-size:14px}.history-empty{margin:0;padding:21px;color:var(--muted);background:#f6f2eb;border:1px dashed var(--line-strong);border-radius:12px;text-align:center}.history-list{display:grid;gap:12px;max-height:540px;overflow-y:auto}.history-entry{padding:17px;background:#fff;border:1px solid var(--line);border-left:5px solid var(--line-strong);border-radius:13px}.correct-history-entry{border-left-color:var(--teal)}.incorrect-history-entry{border-left-color:var(--coral)}.history-entry-heading{display:flex;align-items:center;justify-content:space-between}.history-status{display:inline-flex;padding:6px 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small{color:var(--muted);font-size:10px;font-weight:800;text-transform:uppercase}@media(max-width:1000px){.app-layout{grid-template-columns:1fr}.sound-selector{position:static;max-height:none}.sound-checkbox-list{grid-template-columns:repeat(8,minmax(0,1fr))}}@media(max-width:700px){.app-layout{width:min(100% - 16px,1280px);margin:8px auto 22px;gap:12px}.app,.sound-selector{padding:18px}.app-header{display:block}.score{display:inline-grid;margin-top:17px}.word{font-size:48px}.section-heading{display:block}.section-help{margin-top:8px;text-align:left}.answer-buttons{grid-template-columns:repeat(2,minmax(0,1fr))}.action-buttons{grid-template-columns:1fr}.sound-checkbox-list{grid-template-columns:repeat(4,minmax(0,1fr))}.history-header{display:block}.clear-history-button{margin-top:13px}.history-details{grid-template-columns:1fr}}@media(max-width:430px){.sound-checkbox-list{grid-template-columns:repeat(3,minmax(0,1fr))}.answer-buttons{grid-template-columns:1fr}}.quick-filter-section{margin-top:18px;padding:14px;background:#f7f3ec;border:1px solid var(--line);border-radius:13px}.quick-filter-section h3{margin:0 0 10px;color:var(--muted);font-size:11px;font-weight:900;letter-spacing:.1em;text-transform:uppercase}.quick-filter-grid{display:grid;gap:8px}.quick-filter-grid button{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;min-height:45px;padding:10px 11px;color:var(--ink);background:#fff;border:1px solid var(--line-strong);border-radius:10px;text-align:left;font-size:12px;font-weight:800;transition:transform .15s ease,border-color .15s ease,background .15s ease}.quick-filter-grid button:hover{transform:translateY(-1px);border-color:var(--blue)}.quick-filter-grid button.active{color:var(--navy);background:var(--blue-soft);border-color:var(--blue);box-shadow:0 0 0 2px #2f7ca81c}.quick-filter-grid small{display:grid;min-width:27px;height:27px;place-items:center;color:var(--muted);background:#f1ece4;border-radius:999px;font-size:10px}.quick-filter-grid button.active small{color:#fff;background:var(--blue)}.answer-buttons{grid-template-columns:repeat(3,minmax(0,1fr))}@media(max-width:700px){.answer-buttons{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:520px){.answer-buttons{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:360px){.answer-buttons{grid-template-columns:1fr}}