/* 日本語ゲーム — bright, playful, legible Japanese. */
:root {
  --bg: #fff7ee; --card: #ffffff; --ink: #24202a; --muted: #6f6a78; --line: #f0e4d8;
  --pink: #ff5c8a; --pink-deep: #e6386b; --sun: #ffb703; --sky: #2ec4e6; --leaf: #3ccf7a; --grape: #8a5cf6; --fire: #ff7a3d;
  --ok: #1f9d55; --ok-soft: #e4f8ec; --bad: #d63a3a; --bad-soft: #fde6e6; --warn: #b8730a; --warn-soft: #fff3d6;
  --shadow: 0 6px 20px rgba(80, 40, 20, .10);
  --l5: var(--leaf); --l4: var(--sky); --l3: var(--sun); --l2: var(--fire); --l1: var(--grape);
  --jp: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1b1720; --card: #26212d; --ink: #f6f1ea; --muted: #a79fb0; --line: #37303f;
          --ok-soft: #173d29; --bad-soft: #43201f; --warn-soft: #3d3016; --shadow: 0 6px 20px rgba(0,0,0,.35); }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { font-size: 16px; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, var(--jp);
  background-image: radial-gradient(900px 400px at 110% -10%, rgba(255,92,138,.16), transparent 60%),
                    radial-gradient(700px 400px at -10% 110%, rgba(46,196,230,.16), transparent 60%); }
a { color: var(--pink-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 900px; margin: 0 auto; padding: 1rem 1rem 3rem; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .8rem 1rem; max-width: 900px; margin: 0 auto; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--ink); display: flex; align-items: center; gap: .5rem; }
.brand .mark { display: inline-grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; background: var(--pink); color: #fff; font-family: var(--jp); font-weight: 700; }
.top nav { display: flex; align-items: center; gap: .9rem; flex-wrap: wrap; }
.top nav a { color: var(--ink); font-weight: 600; }
.level-chip, .lv { display: inline-block; padding: .1rem .55rem; border-radius: 999px; font-weight: 800; color: #fff; background: var(--grape); font-size: .85rem; }
.l5 { background: var(--l5); } .l4 { background: var(--l4); } .l3 { background: var(--l3); color: #3a2a00 !important; } .l2 { background: var(--l2); } .l1 { background: var(--l1); }
.linklike { background: none; border: none; color: var(--muted); cursor: pointer; font: inherit; padding: 0; }
.inline { display: inline; }
.foot { text-align: center; color: var(--muted); font-size: .8rem; padding: 1rem; }
.muted { color: var(--muted); } .small { font-size: .82rem; } .sub { font-weight: 500; color: var(--muted); font-size: .8em; }
.card { background: var(--card); border-radius: 18px; box-shadow: var(--shadow); padding: 1.2rem 1.4rem; margin-bottom: 1rem; }
.flash { background: var(--ok-soft); border-radius: 12px; padding: .6rem 1rem; margin-bottom: 1rem; }
.flash p { margin: .2rem 0; }
.banner { background: var(--warn-soft); border-radius: 12px; padding: .6rem 1rem; color: var(--warn); }
.err { background: var(--bad-soft); color: var(--bad); border-radius: 10px; padding: .5rem .8rem; }
h1 { font-size: 1.7rem; margin: .4rem 0 .6rem; letter-spacing: -.01em; }
h3 { margin: 0 0 .5rem; }
button { font: inherit; cursor: pointer; }
.primary { background: var(--pink); color: #fff; border: none; border-radius: 999px; padding: .6rem 1.3rem; font-weight: 800; box-shadow: 0 4px 0 var(--pink-deep); }
.primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--pink-deep); }
.primary.big { font-size: 1.1rem; padding: .8rem 1.6rem; width: 100%; }
.secondary { background: var(--card); color: var(--ink); border: 2px solid var(--line); border-radius: 999px; padding: .55rem 1.2rem; font-weight: 700; }

/* auth */
.auth { max-width: 420px; margin: 2rem auto; }
.auth label { display: block; font-weight: 600; margin: .8rem 0 .3rem; }
.auth input { width: 100%; padding: .7rem .9rem; border: 2px solid var(--line); border-radius: 12px; font: inherit; background: var(--bg); color: var(--ink); }
.auth input:focus { outline: none; border-color: var(--sky); }
.auth .primary { margin-top: 1.2rem; }

/* level select */
.center { text-align: center; }
.levels { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .8rem; margin-top: 1.2rem; }
.level-card { border: none; border-radius: 18px; padding: 1.1rem .8rem; color: #fff; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: .3rem; text-align: center; transition: transform .1s; }
.level-card:hover { transform: translateY(-3px) scale(1.02); }
.level-card.current { outline: 4px solid var(--ink); }
.level-card .big { font-size: 2.2rem; font-weight: 900; }
.level-card .blurb { font-size: .85rem; opacity: .95; }
.level-card .small { color: rgba(255,255,255,.85); }

/* hub */
.hero h1 .lv { font-size: .9rem; vertical-align: middle; }
.games { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1rem 0 1.2rem; }
.game-card { background: var(--card); border-radius: 20px; box-shadow: var(--shadow); padding: 1.2rem; color: var(--ink); display: flex; flex-direction: column; gap: .35rem; position: relative; overflow: hidden; transition: transform .12s; }
.game-card:hover { transform: translateY(-3px); text-decoration: none; }
.game-card::before { content: ""; position: absolute; inset: 0 auto auto 0; height: 6px; width: 100%; background: linear-gradient(90deg, var(--pink), var(--sun), var(--sky)); }
.game-card .icon { font-size: 2.2rem; }
.game-card .name { font-weight: 800; font-size: 1.15rem; }
.game-card .desc { color: var(--muted); font-size: .92rem; min-height: 2.8em; }
.game-card .best { font-size: .85rem; }
.game-card .cta { align-self: flex-start; margin-top: .3rem; background: var(--pink); color: #fff; border-radius: 999px; padding: .35rem .9rem; font-weight: 800; }
.two-col { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.rank { padding-left: 1.4rem; margin: .3rem 0; }
.rank li { display: flex; gap: .6rem; align-items: baseline; padding: .15rem 0; }
.rank li span:first-child { flex: 1; }

/* round */
.round-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.round-head h1 { margin: 0; }
.progress { display: flex; align-items: center; gap: .6rem; font-weight: 700; }
.progress .bar { width: 160px; height: 10px; background: var(--line); border-radius: 999px; overflow: hidden; }
.progress .bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--leaf), var(--sky)); transition: width .3s; }
.stage { background: var(--card); border-radius: 20px; box-shadow: var(--shadow); padding: 1.4rem; margin-top: 1rem; }
.q-level { float: right; }
.q-sentence { font-family: var(--jp); font-size: 1.65rem; line-height: 1.9; margin: .4rem 0 .8rem; word-break: keep-all; }
.q-sentence .blank { display: inline-block; min-width: 2.2em; border-bottom: 3px solid var(--pink); text-align: center; color: var(--pink); }
.q-sentence .blank.filled { color: var(--ink); }
.q-word { font-family: var(--jp); font-size: 2.6rem; font-weight: 700; margin: .3rem 0 0; }
.q-reading { font-family: var(--jp); color: var(--muted); font-size: 1.05rem; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .6rem; margin-top: .8rem; }
.choice { background: var(--bg); color: var(--ink); border: 2px solid var(--line); border-radius: 14px; padding: .8rem .9rem; font-size: 1.05rem; font-family: var(--jp); text-align: left; transition: transform .08s; }
.choice.particle { font-size: 1.6rem; text-align: center; }
.choice:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--sky); }
.choice:disabled { cursor: default; opacity: .7; }
.choice.right { background: var(--ok-soft); border-color: var(--ok); opacity: 1; }
.choice.wrong { background: var(--bad-soft); border-color: var(--bad); opacity: 1; animation: shake .35s; }
.progress .bar.lives i { background: linear-gradient(90deg, var(--fire), var(--bad)); }
.clock { clear: both; height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; margin: .5rem 0 1rem; }
.clock i { display: block; height: 100%; width: 100%; background: linear-gradient(90deg, var(--sky), var(--leaf)); transition-property: width; transition-timing-function: linear; }
.clock.fast i { background: linear-gradient(90deg, var(--fire), var(--pink)); }
.fast-badge { float: right; margin-right: .5rem; background: var(--fire); color: #fff; border-radius: 999px; padding: .1rem .6rem; font-weight: 800; font-size: .85rem; animation: pulse .45s infinite alternate; }
.snap { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: center; min-height: 8rem; }
.snap-kanji { font-family: var(--jp); font-size: 3.4rem; font-weight: 700; text-align: center; line-height: 1.2; word-break: keep-all; }
.snap-def { font-size: 1.35rem; font-weight: 600; text-align: center; border-left: 3px solid var(--line); padding: .6rem 1rem; }
.snap-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: 1rem; }
.snap-btn { border: none; border-radius: 16px; padding: 1rem; font-size: 1.3rem; font-weight: 900; color: #fff; transition: transform .06s; }
.snap-btn.no { background: var(--bad); box-shadow: 0 5px 0 #9d2626; }
.snap-btn.yes { background: var(--ok); box-shadow: 0 5px 0 #14613a; }
.snap-btn:active:not(:disabled) { transform: translateY(3px); box-shadow: none; }
.snap-btn:disabled { opacity: .55; cursor: default; }
.snap-btn.right { outline: 4px solid var(--sun); opacity: 1; }
.snap-btn.wrong { animation: shake .35s; opacity: 1; }
.snap-keys { text-align: center; margin: .6rem 0 0; }
@media (max-width: 420px) { .snap-kanji { font-size: 2.4rem; } .snap-def { font-size: 1.1rem; } }
.trail { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem; font-family: var(--jp); margin: .2rem 0 .4rem; }
.trail span { background: var(--bg); border: 2px solid var(--line); border-radius: 999px; padding: .1rem .6rem; font-size: 1rem; }
.trail i { color: var(--muted); font-style: normal; }
.q-chain { font-family: var(--jp); font-size: 3rem; font-weight: 700; margin: .3rem 0 .6rem; display: flex; align-items: center; gap: .3rem; line-height: 1.2; }
.q-chain .anchor { padding: .1rem .35rem; }
.q-chain .slot { display: inline-grid; place-items: center; min-width: 1.35em; height: 1.35em; border: 3px dashed var(--pink); border-radius: 14px; color: var(--pink); font-size: .9em; }
.q-chain .slot.filled { border-style: solid; border-color: var(--ok); color: var(--ink); background: var(--ok-soft); }
.q-chain .slot.missed { border-color: var(--bad); background: var(--bad-soft); }
.choices.kanji { grid-template-columns: repeat(4, 1fr); }
.choices.kanji .choice { font-size: 1.9rem; padding: .6rem .3rem; }
.pairs { display: grid; grid-template-columns: repeat(5, 1fr); gap: .45rem; margin-top: .8rem; }
.ptile { position: relative; aspect-ratio: 1 / 1.15; border: none; background: transparent; padding: 0; perspective: 600px; cursor: pointer; }
.ptile .face { position: absolute; inset: 0; display: grid; place-items: center; border-radius: 12px; backface-visibility: hidden; transition: transform .5s, box-shadow .15s, border-color .15s; font-family: var(--jp); padding: .15rem; line-height: 1.15; word-break: break-all; }
.ptile .front { background: var(--card); border: 2px solid var(--line); box-shadow: 0 3px 0 var(--line); color: var(--ink); }
.ptile.k .front { font-size: 1.45rem; font-weight: 700; }
.ptile.r .front { font-size: .95rem; background: var(--bg); }
.ptile.r.long .front { font-size: .78rem; letter-spacing: -.03em; }
.ptile .back { background: linear-gradient(135deg, var(--leaf), var(--sky)); color: #fff; transform: rotateY(180deg); font-size: 1.5rem; }
.ptile.sel .front { border-color: var(--sun); box-shadow: 0 0 0 3px var(--sun); }
.ptile.done { pointer-events: none; }
.ptile.done .front { transform: rotateY(180deg); }
.ptile.done .back { transform: rotateY(0); }
.ptile.miss .front { border-color: var(--bad); background: var(--bad-soft); animation: shake .35s; }
.ptile:disabled { cursor: default; }
@media (max-width: 420px) { .pairs { gap: .3rem; } .ptile.k .front { font-size: 1.2rem; } .ptile.r .front { font-size: .8rem; } .ptile.r.long .front { font-size: .68rem; } }
.tiles { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .6rem; min-height: 3rem; }
.tile { background: var(--bg); color: var(--ink); border: 2px solid var(--line); border-radius: 12px; padding: .5rem .8rem; font-family: var(--jp); font-size: 1.3rem; }
.tile:hover:not(:disabled) { border-color: var(--sky); }
.tile.used { visibility: hidden; }
.answer-line { min-height: 3.4rem; border: 2px dashed var(--line); border-radius: 14px; padding: .5rem .8rem; display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; font-family: var(--jp); font-size: 1.35rem; }
.answer-line .placed { background: var(--card); border: 2px solid var(--sky); border-radius: 10px; padding: .25rem .6rem; }
.answer-line .tail { color: var(--muted); }
.row { display: flex; gap: .6rem; margin-top: .8rem; flex-wrap: wrap; align-items: center; }
.feedback { margin-top: .8rem; border-radius: 16px; padding: .9rem 1.1rem; font-weight: 600; }
.feedback.ok { background: var(--ok-soft); color: var(--ok); }
.feedback.bad { background: var(--bad-soft); color: var(--bad); }
.feedback .detail { display: block; font-weight: 400; color: var(--ink); margin-top: .35rem; font-family: var(--jp); }
.feedback .detail .en { color: var(--muted); font-family: inherit; }
.feedback .next { margin-top: .6rem; }
@keyframes shake { 0%,100% { transform: translateX(0) } 25% { transform: translateX(-6px) } 75% { transform: translateX(6px) } }
@keyframes pop { 0% { transform: scale(.6); opacity: 0 } 100% { transform: scale(1); opacity: 1 } }

/* result */
.result { text-align: center; animation: pop .3s ease-out; }
.result .score { font-size: 3.2rem; font-weight: 900; margin: .2rem 0; }
.result .change { display: inline-block; padding: .5rem 1.1rem; border-radius: 999px; font-weight: 800; font-size: 1.1rem; margin: .4rem 0 .8rem; }
.result .change.up { background: var(--ok-soft); color: var(--ok); }
.result .change.down { background: var(--warn-soft); color: var(--warn); }
.result .change.repeat { background: var(--line); color: var(--ink); }
.result .review { text-align: left; margin-top: 1rem; }
.result .review li { padding: .35rem 0; border-bottom: 1px solid var(--line); font-family: var(--jp); }
.result .review .en { color: var(--muted); font-family: inherit; font-size: .85rem; }
@keyframes pulse { from { transform: scale(1); } to { transform: scale(1.08); } }
.confetti { position: fixed; inset: 0; pointer-events: none; overflow: hidden; }
.confetti i { position: absolute; top: -10px; width: 10px; height: 14px; border-radius: 2px; animation: fall 1.6s linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); opacity: .9 } }

/* leaderboard */
.tabs { display: flex; gap: .5rem; flex-wrap: wrap; margin: .5rem 0 1rem; }
.tab { border: 2px solid var(--line); background: var(--card); border-radius: 999px; padding: .35rem .9rem; font-weight: 700; color: var(--ink); }
.tab.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.table { width: 100%; border-collapse: collapse; }
.table th { text-align: left; font-size: .8rem; color: var(--muted); padding: .3rem .5rem; }
.table td { padding: .45rem .5rem; border-top: 1px solid var(--line); }
.table tr.me td { background: var(--warn-soft); }
.history { list-style: none; padding: 0; margin: 0; }
.history li { padding: .35rem 0; border-bottom: 1px solid var(--line); }
.chg.up { color: var(--ok); font-weight: 700; } .chg.down { color: var(--warn); font-weight: 700; } .chg.repeat { color: var(--muted); }

/* grammar */
.grammar .gp summary { cursor: pointer; font-size: 1.05rem; }
.grammar .gp code { background: var(--bg); padding: .1rem .4rem; border-radius: 6px; font-family: var(--jp); margin-left: .4rem; }
.jp { font-family: var(--jp); }
.ex { font-size: 1.15rem; }
.reading { color: var(--muted); font-size: .9rem; }
.prose ul { padding-left: 1.2rem; }
@media (max-width: 600px) { .q-sentence { font-size: 1.4rem; } .progress .bar { width: 110px; } .stage { padding: 1rem; } }