/* Build-a-Kanji — museum-card look of Kanji Unearthed (paper, ink, indigo, rust). Mobile first. */
:root {
  --paper: #f3eee2; --paper-2: #ebe4d3; --card: #fffdf8; --ink: #1d1d1f; --muted: #6f6a60; --line: #d9d0bc;
  --indigo: #274a78; --rust: #b0472d; --ok: #4f7a5a; --ok-bg: #e4efe5; --no: #a8a297; --no-bg: #e7e3da;
  --jp: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --en: 'Source Serif 4', Georgia, serif;
  --ui: Inter, 'Avenir Next', 'Helvetica Neue', Arial, sans-serif;
  --tile: clamp(84px, 27vw, 112px);
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #16171b; --paper-2: #1e2026; --card: #22252c; --ink: #ece7dc; --muted: #a39d91; --line: #3a3d46;
          --indigo: #8fb0e0; --rust: #e0866a; --ok: #8cc49a; --ok-bg: #26382b; --no: #6c6a66; --no-bg: #2b2c30; }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--paper); color: var(--ink); }
body { font-family: var(--en); -webkit-tap-highlight-color: transparent; }
a { color: var(--indigo); }
.app { max-width: 520px; margin: 0 auto; min-height: 100dvh; display: flex; flex-direction: column;
       padding: env(safe-area-inset-top) 16px calc(12px + env(safe-area-inset-bottom)); }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; padding: 12px 0 8px; border-bottom: 1px solid var(--line); }
.brand { text-align: center; }
.brand-name { font-family: var(--ui); font-weight: 700; letter-spacing: .04em; font-size: 18px; }
.brand-sub { font-family: var(--ui); font-size: 12px; color: var(--muted); letter-spacing: .12em; text-transform: uppercase; }
.icon-btn { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line); background: var(--card);
            color: var(--ink); font: 700 18px var(--ui); cursor: pointer; }

/* prompt */
.board { flex: 1; display: flex; flex-direction: column; gap: 14px; padding-top: 14px; }
.prompt { text-align: center; }
.prompt-label { font-family: var(--ui); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.target { font-family: var(--en); font-style: italic; font-weight: 600; font-size: clamp(30px, 9vw, 42px); margin: 4px 0 2px; line-height: 1.1; }
.parts-count { font-family: var(--ui); font-size: 13px; color: var(--muted); }

/* slots */
.slots { display: flex; justify-content: center; gap: 10px; min-height: 64px; }
.slot { width: 58px; height: 64px; border: 2px dashed var(--line); border-radius: 12px; display: grid; place-items: center;
        font: 600 30px var(--jp); background: transparent; color: var(--ink); }
.slot.filled { border-style: solid; border-color: var(--indigo); background: var(--card); }
.slot.plus { width: auto; border: 0; color: var(--muted); font: 600 22px var(--ui); }

/* tiles */
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.tile { min-height: var(--tile); border-radius: 14px; border: 1.5px solid var(--line); background: var(--card); color: var(--ink);
        display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; padding: 8px 4px;
        cursor: pointer; touch-action: manipulation; transition: transform .08s ease, background .2s, border-color .2s; position: relative; }
.tile:active { transform: scale(.97); }
.tile .g { font: 600 clamp(32px, 10vw, 42px)/1 var(--jp); }
.tile .m { font: 500 13px/1.2 var(--ui); color: var(--muted); text-align: center; }
.tile .k { position: absolute; top: 6px; left: 8px; font: 600 11px var(--ui); color: var(--no); }
.tile.sel { border-color: var(--indigo); box-shadow: 0 0 0 2px var(--indigo) inset; }
.tile.ok { background: var(--ok-bg); border-color: var(--ok); }
.tile.ok .m { color: var(--ok); }
.tile.no { background: var(--no-bg); border-color: var(--no-bg); opacity: .55; cursor: default; }
.tile:disabled { cursor: default; }

/* controls */
.controls { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.tries { display: flex; gap: 8px; }
.try-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--line); }
.try-dot.used { background: var(--no); }
.try-dot.won { background: var(--ok); }
.btn { min-height: 48px; padding: 0 22px; border-radius: 24px; border: 1.5px solid var(--ink); background: var(--card); color: var(--ink);
       font: 700 16px var(--ui); cursor: pointer; touch-action: manipulation; }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn:disabled { opacity: .35; cursor: default; }
.hint { font-style: italic; color: var(--muted); text-align: center; font-size: 16px; }
.msg { min-height: 20px; font: 600 14px var(--ui); color: var(--rust); text-align: center; }

/* result */
.result { display: flex; flex-direction: column; gap: 14px; padding: 6px 0 10px; }
.reveal { height: 150px; position: relative; display: grid; place-items: center; }
.reveal .fly { position: absolute; font: 600 44px var(--jp); animation: fly .7s ease-in forwards; }
.reveal .big { font: 700 120px/1 var(--jp); opacity: 0; animation: pop .5s .6s ease-out forwards; }
@keyframes fly { to { transform: translate(0, 0) scale(.6); opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: scale(.85); } to { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { .reveal .fly { display: none; } .reveal .big { animation: none; opacity: 1; } }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 16px; }
.card .label { display: inline-block; font: 700 11px var(--ui); letter-spacing: .14em; padding: 5px 10px; border-radius: 6px; }
.label.ORIGIN { background: var(--indigo); color: var(--card); }
.label.THEORY { border: 1.5px dashed var(--muted); color: var(--muted); }
.label.OLD { border: 1.5px solid var(--rust); color: var(--rust); }
.label.SOUND { border: 1.5px solid var(--indigo); color: var(--indigo); }
.card .row { display: flex; align-items: baseline; gap: 12px; margin-top: 10px; }
.card .kanji { font: 700 52px/1 var(--jp); }
.card .romaji { font-style: italic; color: var(--indigo); font-size: 20px; }
.card .meaning { font-size: 17px; }
.card .eq { font: 500 15px var(--ui); color: var(--muted); margin: 10px 0 0; }
.card .eq b { font-family: var(--jp); color: var(--ink); font-size: 18px; }
.card .story { font-size: 18px; line-height: 1.45; margin: 10px 0 8px; border-left: 3px solid var(--rust); padding-left: 10px; }
.card .src { font: 500 12px var(--ui); color: var(--muted); }
.card .src a { color: var(--muted); }
.share-row { display: flex; gap: 10px; justify-content: center; }
.next { text-align: center; font: 500 13px var(--ui); color: var(--muted); }

/* bonus */
.bonus h3 { margin: 0 0 4px; font: 700 12px var(--ui); letter-spacing: .14em; text-transform: uppercase; color: var(--rust); }
.bonus .q { font-size: 18px; margin: 6px 0 10px; }
.bonus .opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.bonus .opts .wide { grid-column: 1 / -1; }
.bonus .opt { min-height: 64px; border-radius: 12px; border: 1.5px solid var(--line); background: var(--paper-2); color: var(--ink);
              font: 600 15px var(--ui); cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px; }
.bonus .opt .g { font: 600 30px var(--jp); }
.bonus .opt.right { background: var(--ok-bg); border-color: var(--ok); }
.bonus .opt.wrong { background: var(--no-bg); opacity: .6; }
.bonus .explain { margin-top: 10px; line-height: 1.45; }

/* signup */
.signup-title { font: 700 16px var(--ui); }
.signup-text { margin: 4px 0 10px; color: var(--muted); font-size: 15px; }
.signup-row { display: flex; gap: 8px; }
.signup-row input { flex: 1; min-width: 0; min-height: 48px; border-radius: 24px; border: 1.5px solid var(--line); padding: 0 16px;
                    font: 500 16px var(--ui); background: var(--paper); color: var(--ink); }
.signup-done { color: var(--ok); font: 600 14px var(--ui); }
.signup-done.bad { color: var(--rust); }
.signup-fine { margin: 8px 0 0; font: 500 12px var(--ui); color: var(--muted); }
.signup-fine a { color: var(--muted); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.card .more { display: inline-block; margin-top: 12px; font: 700 15px var(--ui); color: var(--indigo); text-decoration: none; }

/* footer + dialogs */
.foot { text-align: center; font: 500 12px var(--ui); color: var(--muted); padding: 14px 0 4px; display: flex; flex-direction: column; gap: 6px; }
.dlg { border: 1px solid var(--line); border-radius: 18px; background: var(--card); color: var(--ink); max-width: min(440px, 92vw); padding: 20px; }
.dlg::backdrop { background: rgba(0,0,0,.35); }
.dlg h2 { margin: 0 0 10px; font: 700 20px var(--ui); }
.dlg ol { padding-left: 20px; line-height: 1.5; font-size: 16px; }
.dlg .small { font-size: 13px; color: var(--muted); font-family: var(--ui); line-height: 1.5; }
.chip { font: 700 12px var(--ui); padding: 2px 8px; border-radius: 6px; }
.chip.ok { background: var(--ok-bg); color: var(--ok); } .chip.no { background: var(--no-bg); color: var(--muted); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; text-align: center; font-family: var(--ui); margin-bottom: 12px; }
.stats .n { font-size: 26px; font-weight: 700; } .stats .l { font-size: 11px; color: var(--muted); }
.dist { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 4px; text-align: left; }
.dist .bar { background: var(--indigo); color: var(--card); font: 700 12px var(--ui); padding: 2px 6px; border-radius: 4px; min-width: 22px; text-align: right; }

/* desktop */
@media (min-width: 720px) {
  .app { padding-top: 24px; }
  :root { --tile: 112px; }
}