*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #1c1c1b;--surface: #272725;--surface2: #313130;--border: rgba(255,255,255,.08);--border2: rgba(255,255,255,.14);--text: #f0ede6;--muted: #888780;--faint: #444441;--hiragana: #9F97DD;--katakana: #5DCAA5;--kanji: #E87B6A;--all: #EF9F27;--radius: 16px;--font: -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif}html{background:var(--bg);color:var(--text);font-family:var(--font)}body{min-height:100dvh;display:flex;flex-direction:column;align-items:center;padding:env(safe-area-inset-top,16px) 20px env(safe-area-inset-bottom,20px);padding-top:max(env(safe-area-inset-top),24px)}.header{width:100%;max-width:520px;display:flex;align-items:baseline;justify-content:space-between;padding:0 0 28px}.logo{font-size:22px;font-weight:600;letter-spacing:-.02em;color:var(--text);text-decoration:none}.logo span{color:var(--muted);font-weight:400;font-size:14px;margin-left:6px}.back-link{font-size:12px;color:var(--faint);text-decoration:none;transition:color .2s}.back-link:hover{color:var(--muted)}.decks{width:100%;max-width:520px;display:flex;gap:8px;margin-bottom:24px;flex-wrap:wrap}.deck-btn{flex:1;min-width:80px;padding:10px 12px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;font-size:13px;font-weight:500;font-family:var(--font);letter-spacing:.01em;transition:all .15s;display:flex;align-items:center;justify-content:center;gap:6px}.deck-btn:hover{border-color:var(--border2);color:var(--text)}.deck-btn.active{border-color:transparent;color:#0f0f0e}.deck-btn.active .dot{opacity:1}.deck-btn.active{background:var(--hiragana)}.scene{width:100%;max-width:520px;aspect-ratio:1.55;perspective:1200px;cursor:pointer;-webkit-tap-highlight-color:transparent}.card-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.4,0,.2,1)}.card-inner.flipped{transform:rotateY(180deg)}.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;user-select:none}.face.back{transform:rotateY(180deg)}.char{font-size:clamp(72px,18vw,112px);line-height:1;color:var(--text);font-weight:300}.romaji{font-size:clamp(22px,5vw,32px);font-weight:600;color:var(--text);letter-spacing:.08em}.char-back{font-size:clamp(44px,10vw,64px);color:var(--muted);font-weight:300;margin-top:4px}.meaning{font-size:13px;color:var(--faint);letter-spacing:.04em;margin-top:2px}.face-hint{position:absolute;bottom:16px;font-size:11px;color:var(--faint);letter-spacing:.05em;text-transform:uppercase}.deck-badge{position:absolute;top:14px;left:16px;font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:999px;border:1px solid var(--border);color:var(--muted)}.controls{width:100%;max-width:520px;display:flex;align-items:center;justify-content:space-between;margin-top:18px;gap:12px}.nav-btn{display:flex;align-items:center;gap:8px;padding:10px 20px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;font-size:14px;font-family:var(--font);font-weight:500;transition:all .15s;-webkit-tap-highlight-color:transparent}.nav-btn:hover{border-color:var(--border2);color:var(--text)}.nav-btn:active{transform:scale(.96)}.nav-btn svg{width:16px;height:16px}.progress{display:flex;flex-direction:column;align-items:center;gap:6px}.progress-count{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}.progress-bar{width:80px;height:2px;background:var(--surface2);border-radius:1px;overflow:hidden}.progress-fill{height:100%;border-radius:1px;background:var(--muted);transition:width .3s ease}.done-screen{width:100%;max-width:520px;display:flex;flex-direction:column;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:48px 32px;gap:12px;text-align:center}.done-kanji{font-size:64px;line-height:1;margin-bottom:8px}.done-title{font-size:20px;font-weight:600}.done-sub{font-size:14px;color:var(--muted);line-height:1.6}.restart-btn{margin-top:16px;padding:12px 28px;border-radius:999px;border:1px solid var(--border2);background:transparent;color:var(--text);font-size:14px;font-family:var(--font);font-weight:500;cursor:pointer;transition:all .15s}.restart-btn:hover{background:var(--surface2)}.restart-btn:active{transform:scale(.97)}@media(max-width:400px){body{padding-left:14px;padding-right:14px}.nav-btn{padding:10px 14px}}