:root{
    /* Little Fun Company palette — same as the hub and Letterush: navy background, deep-navy panels, cream text, gold accent */
    --paper:#1E2A5A; --panel:#141D42; --navy:#17203D;
    --ink:#F7F3E8; --ink-soft:rgba(247,243,232,.68); --line:rgba(247,243,232,.18);
    --seal:#E8B838; --gold:#E8B838; --ok:#4CA36A; --batsu:#D45A4A; --guide:rgba(247,243,232,.14);
    --ui:"Zen Kaku Gothic New","Hiragino Sans","Noto Sans JP",system-ui,sans-serif;
    --jp:"Zen Old Mincho","Hiragino Mincho ProN","Yu Mincho","Noto Serif JP",serif;
  }
  *{box-sizing:border-box}
  html,body{margin:0}
  body{font-family:var(--ui);color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh;min-height:100dvh;overflow-x:hidden;
    padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}
  header,nav,.rows,footer{flex-shrink:0}
  main{min-width:0}
  button,input{font-family:inherit;color:inherit}
  button{cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
  button:focus-visible,input:focus-visible{outline:2px solid var(--seal);outline-offset:2px}

  header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:calc(14px + env(safe-area-inset-top)) 20px 0}
  .brand{display:flex;align-items:baseline;gap:12px;white-space:nowrap}
  @media (max-width:900px){ .brand .en{display:none} header{gap:10px} }
  .brand .jp{font-family:var(--jp);font-size:26px;font-weight:700;letter-spacing:.04em}
  .brand .en{font-size:13px;color:var(--ink-soft)}
  .modes{display:flex;border:1px solid var(--ink);border-radius:3px;overflow:hidden}
  .modes.hidden{display:none}
  .modes button.hidden{display:none}
  .hright{display:flex;align-items:center;gap:10px}
  .sound{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:transparent;display:grid;place-items:center;color:var(--ink)}
  .sound[aria-pressed="false"]{color:var(--ink-soft);border-style:dashed}
  .sound svg{width:18px;height:18px}
  .spk{position:absolute;top:8px;right:8px;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--panel);display:grid;place-items:center;color:var(--ink);z-index:2}
  .spk:hover,.spk.playing{border-color:var(--seal);color:var(--seal)}
  .spk svg{width:18px;height:18px}
  .spk.big{position:static;width:110px;height:110px;border-width:2px;border-color:var(--ink)}
  .spk.big svg{width:48px;height:48px}
  .listen-label{font-size:14px;color:var(--ink-soft);margin-top:14px}

  /* ---------- learn ---------- */
  .learn{width:min(960px,100%);display:flex;flex-direction:column;gap:28px}
  .learn h2{font-family:var(--jp);font-size:22px;font-weight:700;margin:0 0 10px;display:flex;align-items:baseline;gap:10px}
  .learn h2 small{font-family:var(--ui);font-size:13px;font-weight:400;color:var(--ink-soft)}
  .learn .note{font-size:13px;color:var(--ink-soft);line-height:1.5;max-width:70ch}
  .chart{display:grid;grid-template-columns:44px repeat(5,1fr);gap:6px;align-items:stretch}
  .chart .rh{display:flex;align-items:center;justify-content:center;font-family:var(--jp);font-size:16px;color:var(--ink-soft)}
  .cell{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:8px 4px;background:var(--panel);border:1px solid var(--line);border-radius:4px;transition:border-color .12s}
  .cell .k{font-family:var(--jp);font-size:34px;line-height:1.1}
  .cell .r{font-size:11px;color:var(--ink-soft)}
  .cell:hover,.cell.playing,.card:hover,.card.playing,.srow:hover,.srow.playing{border-color:var(--seal)}
  .cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
  .card{display:flex;flex-direction:column;align-items:center;gap:2px;padding:12px 8px;background:var(--panel);border:1px solid var(--line);border-radius:4px;text-align:center;transition:border-color .12s}
  .card .k{font-family:var(--jp);font-size:44px;line-height:1.1}
  .card .k.w{font-size:24px;letter-spacing:.04em}
  .card .e{font-size:30px;line-height:1.2}
  .card .m{font-size:14px;font-weight:500}
  .card .r{font-size:12px;color:var(--ink-soft)}
  .card .r .on{font-family:var(--jp)}
  .slist{display:flex;flex-direction:column;gap:6px}
  .srow{display:flex;align-items:center;gap:14px;padding:10px 14px;background:var(--panel);border:1px solid var(--line);border-radius:4px;text-align:left;transition:border-color .12s}
  .srow .ja{font-family:var(--jp);font-size:22px;flex:1}
  .srow .ja i{font-style:normal;color:var(--seal)}
  .srow .en{font-size:13px;color:var(--ink-soft);text-align:right}
  .srow .kj{font-family:var(--jp);font-size:13px;color:var(--ink-soft)}
  .modes button{background:transparent;border:0;padding:8px 18px;font-size:14px;font-weight:500}
  .modes button[aria-pressed="true"]{background:var(--gold);color:var(--navy)}

  .levels{display:flex;flex-wrap:wrap;gap:0 4px;padding:6px 20px 0;border-bottom:1px solid var(--line)}
  .levels button{background:none;border:0;border-bottom:2px solid transparent;padding:6px 12px 10px;display:flex;flex-direction:column;align-items:center;gap:2px;white-space:nowrap;margin-bottom:-1px}
  .levels button .l{font-size:15px;font-weight:700;line-height:1.2}
  .levels button .s{font-family:var(--jp);font-size:12px;color:var(--ink-soft)}
  .levels button[aria-pressed="true"]{border-bottom-color:var(--gold)}
  .levels button[aria-pressed="true"] .s{color:var(--ink)}

  .rows{display:flex;flex-wrap:wrap;gap:6px;padding:12px 20px;border-bottom:1px solid var(--line);align-items:center;min-height:61px}
  .rows .label{font-size:12px;color:var(--ink-soft);margin-right:6px}
  .rows .chips{display:contents}
  .rows .summary{display:none;background:none;border:0;padding:6px 0;font-size:13px;font-weight:500;color:var(--ink)}
  .rows .summary::after{content:" ▾";color:var(--ink-soft)}
  .rows.open .summary::after{content:" ▴"}
  .chip{font-family:var(--jp);font-size:17px;line-height:1;width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:transparent;transition:background .12s,color .12s}
  .chip.pill{width:auto;border-radius:18px;padding:0 13px;font-family:var(--ui);font-size:13px;font-weight:500;height:32px}
  .chip[aria-pressed="true"]{background:var(--gold);color:var(--navy);border-color:var(--gold)}
  .rows .sep{width:1px;height:24px;background:var(--line);margin:0 6px}
  .rows .right{margin-left:auto;display:flex;gap:14px;align-items:center}
  .rows label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--ink-soft)}
  .rows .all{font-size:12px;color:var(--ink-soft);background:none;border:0;text-decoration:underline;text-underline-offset:3px}

  main{flex:1;display:flex;flex-direction:column;align-items:center;padding:24px 20px 20px}
  .stage{width:min(600px,100%);display:flex;flex-direction:column;align-items:center;gap:18px}
  .prompt{position:relative;width:min(300px,80vw,42vh);aspect-ratio:1;container-type:inline-size;max-width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--panel);border:1px solid var(--line);border-radius:4px;
    background-image:linear-gradient(var(--guide) 1px,transparent 1px),linear-gradient(90deg,var(--guide) 1px,transparent 1px);background-size:50% 50%;background-position:-1px -1px}
  .prompt.wide{width:min(480px,100%);aspect-ratio:auto;min-height:120px;padding:22px 56px 22px 22px;background-image:none;container-type:normal}
  .prompt.wide .mark{font-size:min(150px,60vw)}
  .prompt .kana{font-family:var(--jp);font-size:min(200px,52vw);line-height:1;user-select:none}
  @supports (font-size:1cqw){
    .prompt:not(.wide) .kana{font-size:66cqw} .prompt:not(.wide) .answer{font-size:66cqw} .prompt:not(.wide) .mark{font-size:86cqw}
    .prompt:not(.wide) .spk{width:13cqw;height:13cqw;min-width:32px;min-height:32px}
  }
  .prompt .kana.word{font-size:min(64px,14vw);letter-spacing:.06em}
  .prompt .kana.phrase{font-size:min(32px,7vw);line-height:1.45;text-align:center;letter-spacing:.02em}
  .prompt .rj{font-size:15px;color:var(--ink-soft);margin-top:8px;text-align:center;overflow-wrap:anywhere}
  .prompt .usage{font-size:13px;color:var(--ink-soft);margin-top:10px;text-align:center;max-width:36ch}
  .prompt .romaji{font-size:56px;font-weight:700;letter-spacing:.02em;user-select:none;text-align:center;line-height:1.1;overflow-wrap:anywhere}
  .prompt .romaji.small{font-size:clamp(20px,5.5vw,30px)}
  .prompt .emoji{font-size:64px;line-height:1;margin-bottom:8px}
  .prompt .sub{font-size:14px;color:var(--ink-soft);margin-top:8px;text-align:center}
  .prompt canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;border-radius:4px}
  .prompt .answer{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--jp);font-size:min(200px,52vw);line-height:1;color:var(--ink);opacity:0;pointer-events:none;transition:opacity .2s}
  .prompt .answer.show{opacity:.22}
  .prompt .answer.trace{opacity:.14}
  .above{font-size:clamp(26px,8vw,40px);font-weight:700;line-height:1.1;text-align:center;max-width:100%;overflow-wrap:anywhere}
  .above small{display:block;font-size:15px;font-weight:400;color:var(--ink-soft);margin-top:6px}

  .mark{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;font-family:var(--jp);font-size:min(260px,70vw);line-height:1;opacity:0;transform:scale(.8)}
  .mark.maru{color:var(--ok)} .mark.batsu{color:var(--batsu)}
  .mark.pop{animation:pop .5s ease-out forwards}
  @keyframes pop{0%{opacity:0;transform:scale(.6)}30%{opacity:.85;transform:scale(1.05)}100%{opacity:.85;transform:scale(1)}}

  .choices{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;width:min(420px,100%)}
  .choices button{min-width:0;overflow-wrap:anywhere}
  .choices button{padding:14px 12px;font-size:20px;font-weight:500;background:var(--panel);border:1px solid var(--line);border-radius:4px;transition:background .12s,border-color .12s;line-height:1.2}
  .choices button.jp{font-family:var(--jp);font-size:24px}
  .choices button:hover{border-color:var(--ink)}
  .choices button.right{background:var(--ok);color:#fff;border-color:var(--ok)}
  .choices button.wrong{background:var(--batsu);color:#fff;border-color:var(--batsu)}
  .choices button:disabled{cursor:default}
  .choices button .sub{display:block;font-family:var(--ui);font-size:12px;color:var(--ink-soft);margin-top:3px}
  .choices button.right .sub,.choices button.wrong .sub{color:rgba(255,255,255,.85)}
  .choices.one{grid-template-columns:1fr}
  .choices button.jp.phrase{font-size:19px;line-height:1.35}
  .choices button .key{font-size:11px;color:var(--ink-soft);display:block;margin-top:2px;font-family:var(--ui)}
  .choices button.right .key,.choices button.wrong .key{color:rgba(255,255,255,.8)}

  .tools{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;width:100%}
  .tools button{padding:10px 16px;font-size:14px;font-weight:500;background:var(--panel);border:1px solid var(--line);border-radius:4px}
  .tools button:hover{border-color:var(--ink)}
  .tools button.primary{background:var(--gold);color:var(--navy);border-color:var(--gold)}
  .tools button.good{background:var(--ok);color:#fff;border-color:var(--ok)}
  .tools button.bad{background:var(--batsu);color:#fff;border-color:var(--batsu)}
  .tools label{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--ink-soft);padding:0 6px}
  .hint{font-size:13px;color:var(--ink-soft);text-align:center;min-height:1.2em}
  .detail{font-size:16px;color:var(--ink-soft);text-align:center;min-height:1.4em;line-height:1.5;overflow-wrap:anywhere;max-width:100%}
  .detail b{color:var(--ink);font-family:var(--jp);font-size:22px;font-weight:400;margin-right:6px}

  .typein{font-size:30px;font-family:var(--jp);text-align:center;width:min(340px,100%);padding:8px 0;border:0;border-bottom:2px solid var(--ink);background:transparent;letter-spacing:.06em}
  .typein::placeholder{font-family:var(--ui);font-size:15px;color:var(--ink-soft);letter-spacing:0}
  .typein.ok{border-bottom-color:var(--ok)} .typein.ng{border-bottom-color:var(--batsu)}

  .builder{width:100%;display:flex;flex-direction:column;gap:18px;align-items:center}
  .builder .en{font-size:clamp(18px,5.5vw,24px);font-weight:700;text-align:center;line-height:1.3;max-width:100%}
  .line{position:relative;display:flex;flex-wrap:wrap;gap:8px;justify-content:center;align-items:center;min-height:68px;width:100%;padding:10px;border-bottom:2px dashed var(--line)}
  .line:empty::after{content:"Tap words below in order";color:var(--ink-soft);font-size:13px}
  .bank{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;min-height:52px}
  .tile{font-family:var(--jp);font-size:24px;line-height:1;padding:10px 14px;background:var(--panel);border:1px solid var(--line);border-radius:4px}
  .tile.p{color:var(--seal)}
  .tile:hover{border-color:var(--ink)}
  .tile.ghost{visibility:hidden}
  .line.ok .tile{border-color:var(--ok)} .line.ng .tile{border-color:var(--batsu)}

  footer{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:14px 20px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-soft);flex-wrap:wrap}
  footer b{color:var(--ink);font-weight:700;font-size:16px;margin-right:4px}
  .missed{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
  .missed span{font-family:var(--jp);font-size:18px;color:var(--ink)}
  .missed span i{font-style:normal;font-family:var(--ui);font-size:10px;color:var(--seal);vertical-align:top;margin-left:1px}
  footer .reset{background:none;border:0;font-size:12px;color:var(--ink-soft);text-decoration:underline;text-underline-offset:3px}
  .empty{color:var(--ink-soft);font-size:15px;text-align:center;padding:40px 0}

  @media (max-width:560px){
    header{padding:calc(10px + env(safe-area-inset-top)) 14px 0;flex-wrap:wrap;gap:8px 12px} .brand .en{display:none} .brand .jp{font-size:22px}
    .hright{width:100%;justify-content:space-between}
    .modes button{padding:7px 14px;font-size:13px}
    .levels{padding:4px 6px 0;justify-content:center} .levels button{padding:6px 5px 7px;gap:0} .levels button .l{font-size:12.5px} .levels button .s{font-size:10.5px}
    .rows{padding:6px 14px;min-height:0;gap:4px 6px}
    .rows .label{display:none} .rows .summary{display:inline-block}
    .rows .chips{display:none;width:100%;flex-wrap:wrap;gap:6px;padding:4px 0 6px}
    .rows.open .chips{display:flex}
    .rows .right{margin-left:auto;gap:10px}
    .rows .sep{display:none}
    main{padding:14px 14px 16px} .stage{gap:14px}
    .cell .k{font-size:26px} .chart{grid-template-columns:32px repeat(5,1fr);gap:4px} .cell .r{font-size:10px}
    .cards{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))} .card .k{font-size:36px}
    .srow{flex-wrap:wrap;gap:6px} .srow .en{text-align:left;width:100%}
    .choices button{font-size:17px;padding:12px 8px} .choices button.jp.phrase{font-size:17px} .tile{font-size:20px;padding:9px 11px}
    .tools button{padding:9px 12px;font-size:13px}
    footer{padding:10px 14px calc(10px + env(safe-area-inset-bottom));gap:10px 16px;font-size:12px}
  }
  @media (max-width:360px){
    .modes button{padding:7px 10px;font-size:12px} .levels button{padding:5px 4px 6px} .levels button .l{font-size:12px}
    .choices button{font-size:15px}
  }
  /* short screens (phones in landscape): tighten vertical space */
  @media (max-height:460px){
    header{padding-top:6px} .levels button{padding:2px 8px 4px} .levels button .s{display:none}
    .rows{padding:4px 20px;min-height:0} .rows .label{display:none} .rows .summary{display:inline-block} .rows .chips{display:none;width:100%;flex-wrap:wrap;gap:6px} .rows.open .chips{display:flex}
    main{padding:10px 20px} .stage{gap:10px} .prompt{width:min(300px,80vw,46vh)} .prompt.wide{min-height:0;padding:12px 56px 12px 16px}
    .hint{display:none} footer{padding:6px 20px}
  }
  @media (max-height:460px) and (min-width:640px){
    .stage{flex-direction:row;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px 24px;width:min(760px,100%)}
    .above,.detail,.tools{width:100%} .hint{display:none}
    .choices{width:min(340px,48%)} .typein{width:min(300px,45%)}
    .prompt.wide{width:min(420px,48%)}
  }
  @media (prefers-reduced-motion:reduce){.mark.pop{animation:none;opacity:.85;transform:none} *{transition:none!important}}

  /* ---------- custom flashcards ---------- */
  .custom .fmt{font-size:13px;color:var(--ink-soft);line-height:1.7;background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:10px 12px;margin:10px 0 12px}
  .custom .fmt code{font-family:ui-monospace,Menlo,monospace;font-size:12px;background:rgba(247,243,232,.1);padding:1px 5px;border-radius:3px}
  .custom .fmt b{color:var(--ink)}
  .filebtn{display:inline-flex;align-items:center;border:1px solid var(--gold);border-radius:3px;padding:8px 14px;font-size:14px;cursor:pointer;background:var(--gold);color:var(--navy)}
  .filebtn input{display:none}
  .addrow{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:8px;margin-top:10px}
  .addrow input{border:1px solid var(--line);border-radius:3px;padding:9px 10px;font-size:15px;background:var(--panel);min-width:0}
  @media (max-width:600px){ .addrow{grid-template-columns:1fr 1fr} .addrow button{grid-column:span 2} }
  #importMsg{margin-top:8px;min-height:1em}
  .custom h2{margin-bottom:6px}
  /* site bar sits above the flex column */
  .lfc-bar,.lfc-ad{flex-shrink:0}