:root {
  color-scheme: light dark;
  --bg: #f7f7f8; --card: #fff; --text: #111827; --muted: #6b7280;
  --line: #e5e7eb; --accent: #9B2743; --ok: #059669; --bad: #dc2626;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318; --card: #1b1e25; --text: #e8eaed; --muted: #9aa0a6;
    --line: #2c313a; --accent: #C2415C; --ok: #34d399; --bad: #f87171;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}
header {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 12px 20px; background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
h1 { font-size: 17px; margin: 0; }
.spacer { flex: 1; }
nav { display: flex; gap: 4px; }
button { font: inherit; cursor: pointer; border: 0; border-radius: 6px; }
.tab { padding: 6px 14px; background: transparent; color: var(--muted); font-weight: 600; }
.tab.is-active { background: var(--accent); color: #fff; }
.ghost { padding: 6px 10px; background: transparent; color: var(--muted); }
.ghost:hover { background: var(--bg); }

section { max-width: 860px; margin: 0 auto; padding: 20px; }
.toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; }
.toolbar input, .toolbar select {
  font: inherit; padding: 8px 11px; border-radius: 7px;
  border: 1px solid var(--line); background: var(--card); color: var(--text);
}
.toolbar input { flex: 1; }
.count { color: var(--muted); font-size: 13px; white-space: nowrap; }

/* Saved-on date is a first-class grouping, not a footnote. */
.date-group {
  margin: 26px 0 10px; font-size: 13px; font-weight: 700; color: var(--muted);
  display: flex; align-items: center; gap: 10px;
}
.date-group::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.date-group:first-child { margin-top: 0; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px; margin-bottom: 10px;
}
.card-head { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.hw { font-size: 19px; font-weight: 700; }
.pos { color: var(--muted); font-style: italic; font-size: 13px; }
.cefr {
  background: var(--accent); color: #fff; border-radius: 3px;
  padding: 1px 5px; font-size: 10px; font-weight: 700;
}
.phon { color: var(--muted); font-size: 13px; }
.audio {
  background: transparent; color: var(--accent);
  padding: 2px 5px; font-size: 12px; border: 1px solid var(--line); border-radius: 4px;
}
.card-head .spacer { flex: 1; }
.box { font-size: 11px; color: var(--muted); }
.body { margin-top: 10px; }
.sense { margin: 0 0 12px; }
.def { margin: 0; }
.def .lbl { color: var(--muted); font-style: italic; margin-right: 5px; font-size: 13px; }
ul.ex { margin: 5px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
ul.ex li { margin: 2px 0; }
.collocs { margin-top: 6px; font-size: 13px; }
.collocs b { color: var(--muted); font-weight: 600; }
.chip {
  display: inline-block; background: var(--bg); border: 1px solid var(--line);
  border-radius: 999px; padding: 1px 9px; margin: 2px 3px 2px 0; font-size: 12px;
}
.note {
  width: 100%; margin-top: 8px; font: inherit; font-size: 14px;
  padding: 7px 10px; border-radius: 7px;
  border: 1px dashed var(--line); background: transparent; color: var(--text);
}
.note:focus { border-style: solid; outline: none; border-color: var(--accent); }
.actions { display: flex; gap: 8px; margin-top: 10px; }
.actions a, .actions button {
  font-size: 13px; color: var(--muted); background: transparent;
  text-decoration: none; padding: 3px 8px; border-radius: 5px;
}
.actions a:hover, .actions button:hover { background: var(--bg); color: var(--text); }
.del:hover { color: var(--bad) !important; }
.empty { text-align: center; color: var(--muted); padding: 60px 20px; }

/* Review mode */
.card-area { max-width: 620px; margin: 0 auto; }
.flash {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 34px 26px; text-align: center; min-height: 260px;
  display: flex; flex-direction: column; justify-content: center; gap: 14px;
}
.flash .hw { font-size: 32px; }
.flash .answer { text-align: left; }
.grade { display: flex; gap: 10px; justify-content: center; margin-top: 18px; }
.grade button { padding: 11px 26px; font-weight: 700; color: #fff; }
.grade .no { background: var(--bad); }
.grade .yes { background: var(--ok); }
.reveal { padding: 11px 26px; background: var(--accent); color: #fff; font-weight: 700; }
.progress { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 14px; }

/* ---------- audio ---------- */
.audio.big { font-size: 14px; padding: 6px 14px; font-weight: 600; }
.pron-row {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; flex-wrap: wrap; margin: 4px 0 10px;
}
.hw.small { font-size: 17px; font-weight: 700; }

/* ---------- quiz setup ---------- */
#quiz-setup h2 { font-size: 14px; color: var(--muted); margin: 0 0 12px; }
.modes { display: grid; gap: 8px; margin-bottom: 18px; }
.mode {
  display: flex; align-items: center; gap: 12px; cursor: pointer;
  background: var(--card); border: 1px solid var(--line);
  border-radius: 9px; padding: 11px 14px;
}
.mode:hover { border-color: var(--accent); }
.mode.off { opacity: .45; cursor: default; }
.mode.off:hover { border-color: var(--line); }
.mode span { display: block; }
.mode > span:nth-of-type(1) { flex: 1; }
.mode b { display: block; font-size: 14px; font-weight: 600; }
.mode small { color: var(--muted); font-size: 12px; }
.mode .usable { color: var(--muted); font-size: 12px; white-space: nowrap; }
.count-row {
  display: flex; align-items: center; gap: 10px;
  color: var(--muted); font-size: 13px; margin-bottom: 18px;
}
.count-row input {
  width: 76px; font: inherit; padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 7px;
  background: var(--card); color: var(--text);
}

/* ---------- quiz question ---------- */
.flash.quiz { min-height: 0; padding: 26px 24px; }
.q-mode { font-size: 11px; color: var(--muted); letter-spacing: .04em; }
.q-def { font-size: 19px; line-height: 1.5; }
.q-sentence { font-size: 18px; line-height: 1.7; text-align: left; }
.q-sub { font-size: 13px; color: var(--muted); }
.q-label { font-size: 12px; color: var(--muted); margin: 14px 0 6px; text-align: left; }
/* OALD sometimes gives a whole topic plate rather than a single object, so
   allow enough height for those to stay readable. */
.q-image {
  max-width: 100%; max-height: 360px; object-fit: contain;
  margin: 0 auto; border-radius: 8px; background: #fff; padding: 6px;
}
.q-audio { display: flex; justify-content: center; gap: 10px; }

.choices { display: grid; gap: 9px; margin-top: 16px; }
.choice {
  text-align: left; padding: 13px 16px; font-size: 15px;
  background: var(--card); color: var(--text);
  border: 1px solid var(--line); border-radius: 9px;
}
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice:disabled { cursor: default; }
.choice.is-correct { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.choice.is-wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 14%, transparent); }

.input-row { display: flex; gap: 8px; margin-top: 16px; }
.answer-input {
  flex: 1; font: inherit; font-size: 16px; padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--card); color: var(--text); resize: vertical;
}
.answer-input:focus { outline: none; border-color: var(--accent); }
.answer-input.is-correct { border-color: var(--ok); }
.answer-input.is-wrong { border-color: var(--bad); }
.mic {
  padding: 0 14px; font-size: 17px;
  background: var(--card); border: 1px solid var(--line);
}
.mic:hover { border-color: var(--accent); }
.mic.listening { background: var(--bad); border-color: var(--bad); }

.q-foot { margin-top: 18px; text-align: center; }
.verdict { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.verdict.ok { color: var(--ok); }
.verdict.ng { color: var(--bad); }
.q-detail { font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.q-model { font-size: 14px; color: var(--muted); }
.q-model-box {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 9px; padding: 14px 16px; margin-top: 14px; text-align: left;
}
.chip.hit { border-color: var(--ok); color: var(--ok); }
.chip.miss { opacity: .55; text-decoration: line-through; }

/* ---------- graduation / archive ---------- */
.badge {
  background: var(--muted); color: var(--card);
  border-radius: 3px; padding: 1px 6px; font-size: 10px; font-weight: 700;
}
.card.is-archived { opacity: .72; border-style: dashed; }
.grade.secondary { margin-top: 10px; }
.graduate {
  padding: 8px 20px; font-size: 13px; font-weight: 600;
  background: transparent; color: var(--muted);
  border: 1px solid var(--line); border-radius: 6px;
}
.graduate:hover { border-color: var(--ok); color: var(--ok); }

/* ---------- two-months-old, not graduated ---------- */
.attention {
  border: 1px solid var(--line); border-left: 3px solid #d97706;
  background: var(--card); border-radius: 9px;
  padding: 12px 16px; margin-bottom: 22px;
}
.attention-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.attention-head b { font-size: 14px; white-space: nowrap; }
.attention-head .count { flex: 1; white-space: normal; }
#attention-body { margin-top: 14px; }
#attention-body .card { background: var(--bg); }

/* ---------- sense heading / removal ---------- */
.sense-head { display: flex; align-items: center; gap: 8px; margin-bottom: 2px; }
.sense-head .spacer { flex: 1; }
.shcut {
  font-size: 11px; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; color: var(--muted);
}
.sense-drop {
  background: transparent; color: var(--muted);
  font-size: 15px; line-height: 1; padding: 2px 7px; border-radius: 5px;
  opacity: 0; transition: opacity .12s;
}
.card:hover .sense-drop { opacity: 1; }
.sense-drop:hover { background: var(--bg); color: var(--bad); }

/* ---------- offline ---------- */
.offline-note {
  margin: 0 0 16px; padding: 10px 14px; font-size: 13px;
  color: #92400e; background: #fffbeb;
  border: 1px solid #fcd34d; border-left: 3px solid #d97706;
  border-radius: 8px;
}
@media (prefers-color-scheme: dark) {
  .offline-note { color: #fcd34d; background: #2b2410; border-color: #78500a; }
}
.q-broken {
  padding: 26px 16px; font-size: 15px; color: var(--muted);
  border: 1px dashed var(--line); border-radius: 9px;
}