/* ---------- design tokens (shared) ---------- */
:root{
  --paper: #f4efe2;
  --paper-edge: #e7dfc9;
  --sumi: #262421;
  --indigo: #29344a;
  --indigo-soft: #4d5a78;
  --vermillion: #b23a2e;
  --vermillion-soft: #d98e83;
  --moss: #5c6e4f;
  --wrong: #9c3b2e;
  --correct: #4f6b3f;
  --card-bg: #fffdf8;
}

*{ box-sizing: border-box; }

html,body{
  margin:0; padding:0; min-height:100%;
  background: var(--paper);
  background-image:
    radial-gradient(circle at 10% 15%, rgba(41,52,74,0.035) 0, transparent 40%),
    radial-gradient(circle at 90% 85%, rgba(178,58,46,0.045) 0, transparent 45%);
  color: var(--sumi);
  font-family: 'Inter', sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap{
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

/* ---------- generic buttons ---------- */
.btn{
  font-family:'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--indigo);
  background: none;
  border: 1.5px solid var(--indigo);
  border-radius: 3px;
  padding: 9px 18px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.btn:hover:not(:disabled){ background: var(--indigo); color: #fff; }
.btn:disabled{ opacity: 0.3; cursor: not-allowed; }

/* ============================================================
   HOME / level-select screen
   ============================================================ */
.home-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom: 26px;
}
.home-head h1{
  font-family:'Noto Serif JP', serif;
  font-weight:700;
  font-size:1.7rem;
  margin:0;
  color: var(--indigo);
  letter-spacing:0.02em;
}
.home-head p{
  margin:6px 0 0;
  font-size:0.85rem;
  color: var(--indigo-soft);
}

.levels{
  display:grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.level-card{
  position:relative;
  background: var(--card-bg);
  border:1px solid var(--paper-edge);
  border-radius:4px;
  box-shadow: 0 1px 0 rgba(38,36,33,0.04);
  padding: 26px 28px 24px;
  cursor:pointer;
  text-align:left;
  font-family:'Inter', sans-serif;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.level-card::before{
  content:"";
  position:absolute;
  top:0; left:28px; right:28px;
  height:3px;
  background: var(--vermillion);
  border-radius: 0 0 3px 3px;
}
.level-card:hover{
  transform: translateY(-3px);
  box-shadow: 0 8px 22px rgba(38,36,33,0.10);
  border-color: #d8ceb4;
}

.level-card .row{
  display:flex;
  align-items:center;
  gap:16px;
}
.level-badge{
  flex-shrink:0;
  width:56px; height:56px;
  border-radius:50%;
  border:2.5px solid var(--vermillion);
  color: var(--vermillion);
  display:flex; align-items:center; justify-content:center;
  font-family:'Noto Serif JP', serif;
  font-size:1.15rem; font-weight:700;
  background: rgba(178,58,46,0.04);
}
.level-card h2{
  margin:0;
  font-family:'Noto Serif JP', serif;
  font-weight:700;
  font-size:1.15rem;
  color: var(--indigo);
  letter-spacing:0.02em;
}
.level-card .sub{
  margin:3px 0 0;
  font-size:0.8rem;
  color: var(--indigo-soft);
}
.level-card .meta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-top:16px;
  padding-top:14px;
  border-top:1px dashed var(--paper-edge);
  font-size:0.78rem;
  color: var(--indigo-soft);
}
.level-card .meta .count b{ color: var(--indigo); font-weight:600; }
.level-card .meta .state{ display:flex; align-items:center; gap:6px; }
.level-card .dot{
  width:8px; height:8px; border-radius:50%;
  background: var(--paper-edge);
}
.level-card .dot.done{ background: var(--moss); }
.level-card .dot.partial{ background: var(--vermillion-soft); }
.level-card .arrow{ color: var(--vermillion); font-size:1.1rem; }

/* home loading placeholder */
.home-loading{
  text-align:center;
  color: var(--indigo-soft);
  font-size:0.9rem;
  padding: 40px 0;
}

/* ============================================================
   QUIZ screen
   ============================================================ */
.quiz-bar{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  margin-bottom: 22px;
}
.quiz-bar .title-wrap h1{
  font-family:'Noto Serif JP', serif;
  font-weight:700;
  font-size:1.5rem;
  margin:0 0 4px;
  color: var(--indigo);
  letter-spacing: 0.02em;
}
.quiz-bar .title-wrap p{
  margin:0;
  font-size:0.85rem;
  color: var(--indigo-soft);
}

.back-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-bottom:16px;
  font-size:0.82rem;
  font-weight:600;
  color: var(--indigo-soft);
  background:none;
  border:none;
  cursor:pointer;
  padding:0;
  transition: color .15s ease;
}
.back-link:hover{ color: var(--indigo); }

.score-stamp{
  flex-shrink:0;
  width: 74px; height: 74px;
  border-radius: 50%;
  border: 2.5px solid var(--vermillion);
  color: var(--vermillion);
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  transform: rotate(-6deg);
  font-family:'Noto Serif JP', serif;
  line-height:1.05;
  background: rgba(178,58,46,0.03);
}
.score-stamp .n{ font-size:1.15rem; font-weight:700; }
.score-stamp .d{ font-size:0.6rem; letter-spacing: 0.05em; }

.progress-track{
  height:5px;
  width:100%;
  background: var(--paper-edge);
  border-radius: 3px;
  overflow:hidden;
  margin-bottom: 28px;
}
.progress-fill{
  height:100%;
  background: var(--indigo);
  width:0%;
  transition: width .25s ease;
}

/* kanji chip list (N4 levels that show one) */
.kanji-pool{
  display:flex;
  flex-wrap:wrap;
  gap: 6px;
  margin: -10px 0 22px;
}
.kanji-pool span{
  font-family:'Noto Serif JP', serif;
  font-size: 0.95rem;
  background: var(--card-bg);
  border:1px solid var(--paper-edge);
  color: var(--indigo-soft);
  padding: 3px 9px;
  border-radius: 3px;
}

.card{
  background: var(--card-bg);
  border: 1px solid var(--paper-edge);
  border-radius: 4px;
  box-shadow: 0 1px 0 rgba(38,36,33,0.04);
  padding: 40px 34px 30px;
  position: relative;
}
.card::before{
  content: "";
  position:absolute;
  top:0; left: 28px; right: 28px;
  height: 3px;
  background: var(--vermillion);
  border-radius: 0 0 3px 3px;
}

.q-index{
  font-size: 0.72rem;
  color: var(--indigo-soft);
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

.kanji-display{
  text-align:center;
  margin-bottom: 6px;
}
.kanji-word{
  font-family: 'Noto Serif JP', serif;
  font-size: 3.1rem;
  font-weight: 600;
  color: var(--sumi);
  line-height:1;
}
.kanji-word .target{ color: var(--vermillion); }

ruby rt{
  font-family: 'Noto Serif JP', serif;
  font-size: 0.95rem;
  color: var(--indigo-soft);
  font-weight: 400;
}

.clue{
  text-align:center;
  font-size: 0.95rem;
  color: var(--indigo-soft);
  font-style: italic;
  margin: 10px 0 30px;
}
.clue b{
  font-style: normal;
  color: var(--indigo);
}

.options{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 22px;
}

.opt{
  display:flex;
  align-items:center;
  gap: 10px;
  text-align:left;
  padding: 13px 16px;
  border: 1.5px solid var(--paper-edge);
  border-radius: 3px;
  background: #fff;
  font-family:'Noto Serif JP', serif;
  font-size: 1.05rem;
  color: var(--sumi);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
}
.opt .dot{
  width: 15px; height:15px;
  border-radius:50%;
  border: 1.5px solid var(--indigo-soft);
  flex-shrink:0;
  position:relative;
}
.opt:hover:not(.locked){
  border-color: var(--indigo-soft);
  background: #faf8f2;
}
.opt.selected .dot{
  border-color: var(--indigo);
  background: var(--indigo);
}
.opt.correct{
  border-color: var(--correct);
  background: rgba(79,107,63,0.08);
}
.opt.correct .dot{
  background: var(--correct);
  border-color: var(--correct);
}
.opt.incorrect{
  border-color: var(--wrong);
  background: rgba(156,59,46,0.07);
}
.opt.incorrect .dot{
  background: var(--wrong);
  border-color: var(--wrong);
}
.opt.locked{ cursor: default; }

.feedback{
  min-height: 26px;
  text-align:center;
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.feedback.correct{ color: var(--correct); }
.feedback.incorrect{ color: var(--wrong); }

.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top: 26px;
  font-size: 0.85rem;
}
.nav .counter{
  color: var(--indigo-soft);
  letter-spacing: 0.03em;
  text-align:center;
}

.done-banner{
  text-align:center;
  margin-top: 22px;
  font-size: 0.85rem;
  color: var(--moss);
  font-weight:600;
}

/* restart score button */
.restart-zone{
  display:flex;
  justify-content:center;
  margin-top: 18px;
}
.btn-restart{
  border-color: var(--vermillion);
  color: var(--vermillion);
  background: rgba(178,58,46,0.03);
}
.btn-restart:hover:not(:disabled){ background: var(--vermillion); border-color: var(--vermillion); color:#fff; }
.confirm-inline{
  margin-top:12px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:10px;
  font-size:0.85rem;
  color: var(--wrong);
  font-weight:600;
  animation: fadein .18s ease;
}
.confirm-inline .btn-confirm-yes{ border-color: var(--wrong); color: var(--wrong); }
.confirm-inline .btn-confirm-yes:hover:not(:disabled){ background: var(--wrong); border-color: var(--wrong); color:#fff; }

@keyframes fadein{ from{opacity:0; transform:translateY(-4px);} to{opacity:1; transform:none;} }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 480px){
  .options{ grid-template-columns: 1fr; }
  .card{ padding: 30px 22px 26px; }
  .kanji-word{ font-size: 2.5rem; }
  .home-head{ flex-direction:column; align-items:flex-start; }
}