:root{--bg:#0d0d14;--card:#1e1e2a;--border:#2e2e3e;--gold:#ffa502;--green:#2ed573;--blue:#3a9dd4;--purple:#a55eea;--red:#ff4757;--text:#f0f0f8;--muted:#6b6b80;--surface:#16161f}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{font-family:'DM Mono',monospace;background:var(--bg);color:var(--text);padding-top:44px}
.app{max-width:480px;margin:0 auto;padding:6px 0 40px}
nav{position:fixed;top:0;left:0;right:0;background:rgba(13,13,20,0.97);border-bottom:1px solid var(--border);display:flex;height:44px;z-index:9999}
nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-decoration:none;color:var(--muted)}
nav a.on{color:var(--gold)}
nav a span:first-child{font-size:1.1rem;line-height:1;margin-bottom:1px}
nav a span:last-child{font-size:0.38rem;letter-spacing:0.06em;text-transform:uppercase;color:inherit}
.pg-head{padding:10px 18px 6px;display:flex;align-items:baseline;justify-content:space-between}
.pg-title{font-size:0.56rem;letter-spacing:0.2em;text-transform:uppercase;color:var(--muted)}
.pg-acc{font-size:0.65rem;color:var(--gold)}
.mod{margin:0 14px 12px;border-radius:16px;overflow:hidden;border:1px solid rgba(165,94,234,0.35);background:linear-gradient(135deg,rgba(165,94,234,0.06),#1e1e2a)}
.mod-top{padding:11px 14px;display:flex;align-items:center;gap:10px;cursor:pointer;user-select:none}
.mod-top:active{opacity:0.75}
.mod-info{flex:1;min-width:0}
.mod-grammar{font-family:'Noto Sans JP',sans-serif;font-size:1.6rem;color:var(--gold);font-weight:700;line-height:1.1;margin-bottom:4px}
.mod-meaning{font-size:0.6rem;color:var(--muted);line-height:1.5}
.mod-sub{font-size:0.54rem;color:var(--muted);margin-top:2px}
.mod-right{text-align:right;flex-shrink:0}
.mod-pct{font-size:1rem;font-weight:500;line-height:1}
.mod-chevron{font-size:0.8rem;color:var(--muted);margin-top:4px;transition:transform 0.2s}
.mod.open .mod-chevron{transform:rotate(90deg)}
.mod-prog{height:3px;background:var(--border);margin:0 14px 8px}
.mod-prog-fill{height:100%;border-radius:2px;transition:width 0.4s}
.mod-body{display:none;border-top:1px solid var(--border)}
.mod.open .mod-body{display:block}
.tabs{display:flex;border-bottom:1px solid var(--border)}
.tab{flex:1;padding:10px 6px;background:transparent;border:none;font-family:'DM Mono',monospace;font-size:0.6rem;color:var(--muted);cursor:pointer;text-transform:uppercase;letter-spacing:0.06em;border-bottom:2px solid transparent;margin-bottom:-1px}
.tab.active{color:var(--gold);border-bottom-color:var(--gold)}
.tab:active{opacity:0.7}
.tab-content{display:none;padding:14px 16px}
.tab-content.active{display:block}
.notes-text{font-size:0.72rem;line-height:1.85;color:var(--text);white-space:pre-wrap;word-break:break-word}
.notes-text strong,.notes-lbl{color:var(--gold);font-weight:500}
.focus-pill{display:inline-block;background:rgba(255,165,2,0.08);border:1px solid rgba(255,165,2,0.2);color:var(--gold);font-size:0.6rem;padding:4px 10px;border-radius:6px;margin-bottom:12px;line-height:1.4}
.ex-item{padding:11px 0;border-bottom:1px solid var(--border)}
.ex-item:last-child{border-bottom:none}
.ex-jp{font-family:'Noto Sans JP',sans-serif;font-size:1rem;line-height:1.5;margin-bottom:4px}
.ex-en{font-size:0.6rem;color:var(--muted);line-height:1.4}
.quiz-screen{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg);z-index:1000;overflow-y:auto;-webkit-overflow-scrolling:touch}
.quiz-screen.active{display:block}
.qnav{display:flex;align-items:center;padding:50px 16px 8px;gap:10px}
.qback{width:36px;height:36px;background:var(--card);border:1px solid var(--border);border-radius:9px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem;color:var(--text);flex-shrink:0}
.qback:active{opacity:0.6}
.qinfo{flex:1}
.qpoint{font-family:'Noto Sans JP',sans-serif;font-size:0.95rem;color:var(--gold);font-weight:500}
.qprog{font-size:0.58rem;color:var(--muted);margin-top:1px}
.prog-track{height:3px;background:var(--border);margin:0 16px 12px;border-radius:2px;overflow:hidden}
.prog-fill{height:100%;background:var(--gold);border-radius:2px;transition:width 0.4s}
.qcard{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px;margin:0 16px 10px;position:relative;overflow:hidden}
.qcard::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--gold),transparent)}
.qtag{font-size:0.5rem;letter-spacing:0.15em;text-transform:uppercase;color:var(--muted);margin-bottom:7px}
.qen{font-size:0.9rem;line-height:1.7}
.qhint{font-size:0.58rem;color:var(--muted);margin-top:6px}
.qlabel{font-size:0.54rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted);margin:0 16px 7px;display:block}
.ans-row{min-height:44px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:6px 10px;margin:0 16px 8px;display:flex;flex-wrap:wrap;gap:5px;align-items:center}
.ans-placeholder{color:var(--muted);font-size:0.62rem}
.bank-header{display:flex;align-items:center;justify-content:space-between;padding:0 16px;margin-bottom:6px}
.bank-toggle{padding:4px 10px;background:var(--surface);border:1px solid var(--border);border-radius:7px;font-family:'DM Mono',monospace;font-size:0.6rem;color:var(--muted);cursor:pointer;transition:color 0.15s,border-color 0.15s}
.bank-toggle.active{color:var(--gold);border-color:var(--gold)}
.word-bank{display:flex;flex-wrap:wrap;gap:6px;padding:0 16px;margin-bottom:8px}
.wtok{font-family:'Noto Sans JP',sans-serif;font-size:0.9rem;padding:7px 11px;border-radius:9px;border:2px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;user-select:none;line-height:1}
.wtok:active{opacity:0.7}
.wtok.used{opacity:0.2;pointer-events:none}
.wtok.in-ans{border-color:var(--gold);color:var(--gold);background:rgba(255,165,2,0.08)}
.wtok.ok{border-color:var(--green);color:var(--green);background:rgba(46,213,115,0.12)}
.wtok.wrong{border-color:var(--red);color:var(--red);background:rgba(255,71,87,0.1)}
.act-row{display:flex;gap:8px;padding:0 16px;margin-bottom:8px}
.check-btn{flex:2;padding:11px;background:var(--blue);color:#fff;border:none;border-radius:10px;font-family:'DM Mono',monospace;font-size:0.72rem;font-weight:500;cursor:pointer;text-transform:uppercase}
.clear-btn{flex:1;padding:11px;background:transparent;color:var(--muted);border:1px solid var(--border);border-radius:10px;font-family:'DM Mono',monospace;font-size:0.68rem;cursor:pointer}
.fb{margin:0 16px 8px;padding:10px 13px;border-radius:10px;display:none}
.fb.show{display:flex;gap:8px;align-items:flex-start}
.fb.ok{background:rgba(46,213,115,0.08);border:1px solid rgba(46,213,115,0.3)}
.fb.wrong{background:rgba(255,71,87,0.08);border:1px solid rgba(255,71,87,0.3)}
.fb-icon{font-size:0.95rem;flex-shrink:0}
.fb-title{font-size:0.72rem;font-weight:500;margin-bottom:2px}
.fb-ans{font-family:'Noto Sans JP',sans-serif;font-size:0.88rem;color:var(--green);margin-top:3px}
.next-btn{display:none;margin:0 16px 14px;padding:13px;background:var(--gold);color:#000;border:none;border-radius:11px;font-family:'DM Mono',monospace;font-size:0.76rem;font-weight:500;cursor:pointer;text-transform:uppercase;width:calc(100% - 32px)}
.next-btn.show{display:block}
.res{padding:60px 20px 20px;text-align:center}
.res-emoji{font-size:3rem;margin-bottom:10px}
.res-title{font-family:'Noto Sans JP',sans-serif;font-size:1.3rem;font-weight:700;color:var(--gold);margin-bottom:5px}
.res-score{font-size:3rem;font-weight:500;margin-bottom:2px}
.res-sub{font-size:0.58rem;color:var(--muted);text-transform:uppercase;letter-spacing:0.1em;margin-bottom:20px}
.res-card{background:var(--card);border:1px solid var(--border);border-radius:13px;overflow:hidden;margin-bottom:12px;text-align:left}
.res-row{display:flex;justify-content:space-between;padding:10px 14px;border-bottom:1px solid var(--border);font-size:0.72rem}
.res-row:last-child{border-bottom:none}
.rl{color:var(--muted)}.vg{color:var(--green);font-weight:500}.vr{color:var(--red);font-weight:500}
.retry-btn{width:100%;padding:14px;background:var(--gold);color:#000;border:none;border-radius:12px;font-family:'DM Mono',monospace;font-size:0.8rem;font-weight:500;cursor:pointer;text-transform:uppercase;margin-bottom:8px}
.done-btn{width:100%;padding:12px;background:var(--card);color:var(--text);border:1px solid var(--border);border-radius:12px;font-family:'DM Mono',monospace;font-size:0.72rem;cursor:pointer;text-transform:uppercase}

/* Level-up shimmer on Next button */
@keyframes levelup-shimmer {
  0%   { background:var(--gold); box-shadow:none; }
  20%  { background:#a55eea; box-shadow:0 0 18px rgba(165,94,234,0.8), 0 0 40px rgba(165,94,234,0.4); }
  50%  { background:#c084fc; box-shadow:0 0 28px rgba(192,132,252,0.9), 0 0 60px rgba(165,94,234,0.5); }
  80%  { background:#a55eea; box-shadow:0 0 18px rgba(165,94,234,0.8), 0 0 40px rgba(165,94,234,0.4); }
  100% { background:var(--gold); box-shadow:none; }
}
.next-btn.level-up {
  animation: levelup-shimmer 1.8s ease-in-out;
  color: #fff;
}