:root{color-scheme:light;--ink:#173b3f;--paper:#f5f5ef;--line:#d2ddd6;--accent:#16675d;--vv-top:0px;--vv-height:100dvh;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-underline-offset:3px}button,input,select,textarea{font:inherit}button,.button{cursor:pointer;display:inline-flex;align-items:center;justify-content:center;border:1px solid #b5c7bd;border-radius:9px;background:#fff;color:var(--ink);min-height:40px;padding:8px 14px;text-decoration:none;font-weight:600}button:disabled{opacity:.5;cursor:wait}button:hover,.button:hover{background:#e9efdf}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #d6a64a;outline-offset:3px}.primary{background:var(--ink);border-color:var(--ink);color:#fff}.primary:hover{background:var(--accent)}input,select,textarea{border:1px solid #a9beb5;border-radius:8px;padding:9px;background:#fff;color:#14383a;max-width:100%;min-width:0}input:not([type=checkbox]):not([type=hidden]),select{min-height:44px;width:100%}input[type=range]{padding:0}label{display:grid;gap:7px;font-size:14px}h1{font-size:clamp(23px,4vw,32px);font-weight:650;letter-spacing:-.04em;line-height:1.3;margin:6px 0 18px}h1 span{font-weight:400}p{line-height:1.7}code{overflow-wrap:anywhere;font-size:12px}small,.muted{color:#576e66}.eyebrow{font-size:10px;letter-spacing:.2em;font-weight:700;color:#638276;margin:0 0 6px}
.app-header{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--ink);color:#fff;padding:calc(10px + env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) 10px max(16px,env(safe-area-inset-left))}.brand{font-weight:700;color:#fff;text-decoration:none;white-space:nowrap;font-size:18px;letter-spacing:-.03em}.brand small{font-size:10px;color:#bfd0bd;margin-left:6px}.brand-mark{display:inline-grid;place-items:center;width:30px;height:30px;border:1px solid #547169;border-radius:8px;margin-right:6px;color:#d9dc9e}.navigation summary{cursor:pointer;font-size:13px;min-height:32px;padding:7px}.navigation nav{position:absolute;right:max(10px,env(safe-area-inset-right));top:calc(58px + env(safe-area-inset-top));width:min(290px,calc(100vw - 20px));background:white;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 40px #123b4030;padding:10px;z-index:20}.navigation nav a{display:block;padding:12px;text-decoration:none}.navigation form button{width:100%;font-size:13px}.quick-actions{display:flex;align-items:center;gap:7px;padding:7px max(14px,env(safe-area-inset-left));background:#e6ecdf;border-bottom:1px solid var(--line)}.quick-actions button{min-height:32px;padding:5px 13px;font-size:12px}.quick-actions span{margin-left:auto;font-size:11px;letter-spacing:.08em}
main{width:min(900px,100%);margin:0 auto;padding:24px max(16px,env(safe-area-inset-right)) 24px max(16px,env(safe-area-inset-left));min-width:0}.lesson-heading{display:flex;justify-content:space-between;gap:12px;align-items:center}.lesson-heading>a{font-size:12px;white-space:nowrap}.lesson-select{display:grid;grid-template-columns:1fr 1fr auto;gap:12px;align-items:end;padding:14px;background:#e9ede3;border-radius:12px}.lesson-select label{font-size:12px}.lesson-characters{font-size:12px;overflow-wrap:anywhere;margin:12px 0}.lesson-characters strong{margin-left:8px;letter-spacing:.1em}.preview summary{cursor:pointer;font-size:12px;margin:8px 0 14px}.preview-buttons{display:flex;flex-wrap:wrap;gap:4px;margin-bottom:12px}.preview-buttons button{min-width:34px;min-height:32px;padding:4px}.practice-workspace{border:1px solid #bbcdc2;border-radius:16px;padding:18px;background:#fff;box-shadow:0 10px 35px #284e3010;min-width:0;display:flex;flex-direction:column;gap:10px}.player-bar{background:#fff;z-index:2;flex-shrink:0}.transport{display:flex;gap:7px;align-items:center}.transport button{font-size:13px;min-height:36px}#close-editor{margin:0}.playback-status{display:flex;gap:10px;align-items:center;padding-top:10px}progress{display:block;min-width:0;width:100%;height:8px;accent-color:var(--accent);border:0}output{font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap;min-width:83px}.player-settings{font-size:12px;padding:4px 0 10px;border-bottom:1px solid var(--line)}.player-settings summary{cursor:pointer;display:flex;justify-content:space-between;gap:8px}.player-settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:14px 0}.player-settings-grid label{font-size:12px}.player-settings-grid button{font-size:12px;grid-column:1/-1}.answer-label{display:flex;justify-content:space-between;gap:8px;font-weight:600;font-size:13px}.answer-label span{font-size:10px;font-weight:400;color:#6c8078}#textinput{width:100%;height:96px;min-height:80px;resize:vertical;font:18px/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;flex-shrink:0;scroll-margin:10px;text-transform:uppercase;font-variant-numeric:slashed-zero}.keypad{display:grid;gap:4px;flex-shrink:0;touch-action:manipulation;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.key-row{display:grid;gap:4px;min-width:0}.keyboard-letters{grid-template-columns:repeat(20,minmax(0,1fr))}.keyboard-letters>button{grid-column:span 2}.keyboard-home>button:first-child{grid-column:2/span 2}.keypad .key-side{grid-column:span 3}.keypad button{height:40px;min-height:40px;min-width:0;padding:0;font:600 18px/1 ui-monospace,SFMono-Regular,Consolas,monospace;font-variant-numeric:slashed-zero;border-radius:6px;touch-action:manipulation}.keypad button.pressed{background:#cfdfd4;transform:translateY(1px)}.keypad .key-wide{grid-column:span 3;background:#e6ecdf;font-size:22px}.keyboard-symbols{grid-template-columns:minmax(0,1fr)}.symbol-bank{display:grid;gap:4px;grid-template-columns:repeat(8,minmax(0,1fr));min-width:0}.symbol-bank[hidden]{display:none}#extra-symbols{grid-template-columns:repeat(10,minmax(0,1fr))}.keypad #more-symbols{font:600 11px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#e6ecdf}.keyboard-actions{grid-template-columns:1.25fr 1.25fr 5fr 2.5fr}.keyboard-actions button{background:#e6ecdf}.keyboard-actions #answer-space,.keyboard-actions #close-editor{font:600 13px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.submit-row{display:flex;align-items:center;gap:10px}.submit-row button{font-size:13px}.submit-row span{font-size:10px;color:#6c8078}.practice-note{font-size:12px;color:#60766b}.app-footer{margin:20px auto;padding:18px max(16px,env(safe-area-inset-right)) calc(24px + env(safe-area-inset-bottom));max-width:900px;border-top:1px solid var(--line);font-size:10px;line-height:1.8;color:#687c71}.auth-card{max-width:460px;margin:30px auto}.auth-card form{display:grid;gap:18px}.notice{padding:12px;background:#e7edcd;border:1px solid #ced9ab;border-radius:9px}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.checkbox{display:flex;align-items:center}.table-scroll{max-width:100%;overflow-x:auto}.history,.result-table{width:100%;border-collapse:collapse;font-size:13px}.history th,.history td,.result-table th,.result-table td{text-align:left;padding:10px 7px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.result-table{table-layout:fixed}.result-table td{font-family:ui-monospace,monospace}.result-summary{display:flex;align-items:center;gap:28px;background:#e6ecdf;border-radius:12px;padding:20px}.result-summary>strong{font-size:52px;font-weight:500}.result-summary small{display:block;font-size:13px}
@media(max-width:600px){main{padding-top:18px}.lesson-select{gap:8px;grid-template-columns:1fr 1fr}.lesson-select>button{grid-column:1/-1;min-height:34px;font-size:12px}.practice-workspace{padding:12px;gap:8px}.lesson-heading>a{font-size:10px}.settings-grid{grid-template-columns:1fr}.app-header{padding-top:calc(8px + env(safe-area-inset-top));padding-bottom:8px}.history{font-size:11px}.history th,.history td{padding:8px 3px}.history td:first-child{width:30%}.result-table td{font-size:11px}.editing .practice-workspace{position:fixed;top:calc(var(--vv-top) + max(4px,env(safe-area-inset-top)));left:max(6px,env(safe-area-inset-left));right:max(6px,env(safe-area-inset-right));max-height:calc(var(--vv-height) - max(4px,env(safe-area-inset-top)) - max(4px,env(safe-area-inset-bottom)));overflow-y:auto;z-index:30;box-shadow:0 0 0 100vmax #f5f5efed;padding:10px;border-radius:12px}.editing .player-bar{position:sticky;top:-10px;padding:2px 0 8px}.editing .player-settings{display:none}.editing #close-editor{display:inline-flex}.editing .answer-label{font-size:11px}.editing .submit-row{margin-bottom:env(safe-area-inset-bottom)}.editing .practice-note{padding-top:280px}.editing textarea{resize:none}}
@media(max-height:500px) and (orientation:landscape){.editing .practice-workspace{position:fixed;top:calc(var(--vv-top) + max(2px,env(safe-area-inset-top)));left:max(6px,env(safe-area-inset-left));right:max(6px,env(safe-area-inset-right));max-height:calc(var(--vv-height) - max(2px,env(safe-area-inset-top)) - max(2px,env(safe-area-inset-bottom)));overflow-y:auto;z-index:30;background:white;padding:8px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);grid-template-areas:"player keyboard" "label keyboard" "answer keyboard" "submit keyboard" "error keyboard";gap:6px 12px;align-content:start}.editing .player-bar{grid-area:player;position:static;padding:0}.editing .player-settings{display:none}.editing #close-editor{display:inline-flex}.editing #textinput{grid-area:answer;height:80px;min-height:60px}.editing .answer-label{grid-area:label}.editing .answer-label span{display:none}.editing .keypad{grid-area:keyboard}.editing .keypad button{height:34px;min-height:34px}.editing .submit-row{grid-area:submit;flex-wrap:wrap}.editing #player-error{grid-area:error}}
@media(max-height:600px) and (orientation:portrait){.editing .practice-workspace{gap:6px}.editing .playback-status{padding-top:6px}.editing #textinput{height:80px;min-height:60px}.editing .keypad button{height:36px;min-height:36px}.editing .answer-label span{display:none}}
.answer-caret-mirror{position:absolute;left:-10000px;top:0;visibility:hidden;pointer-events:none;white-space:pre-wrap;overflow-wrap:break-word;border:0;box-sizing:border-box}