/* ═══════════════════════════════════════════════
   FILE: styles/wrongbook.css
   RESPONSIBILITY: Wrong Answer Book page styles
   ═══════════════════════════════════════════════ */

/* ── Stats Bar ─────────────────────────────── */
.wb-stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.wb-stat {
  flex: 1;
  min-width: 80px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
}
.wb-stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: 'Playfair Display', serif;
  color: var(--fg);
  line-height: 1;
}
.wb-stat-num.pending { color: var(--red); }
.wb-stat-num.mastered { color: var(--green); }
.wb-stat-label {
  font-size: .72rem;
  color: var(--mid);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* ── Top Actions ───────────────────────────── */
.wb-top-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.wb-practice-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  background: var(--gold);
  color: #fff;
  border: none;
  border-radius: 24px;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.wb-practice-btn:hover { opacity: .88; transform: translateY(-1px); }
.wb-clear-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 9px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 24px;
  color: var(--mid);
  font-size: .85rem;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.wb-clear-btn:hover { border-color: var(--red); color: var(--red); }

/* ── Filter Pills ──────────────────────────── */
.wb-filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.wb-pill {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--mid);
  font-size: .82rem;
  cursor: pointer;
  transition: all .15s;
}
.wb-pill.sel,
.wb-pill:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: #fff;
}
/* Subject pills use custom color when selected */
.wb-pill[data-f]:not([data-f="all"]).sel {
  background: var(--sc, var(--gold));
  border-color: var(--sc, var(--gold));
  color: #fff;
}

/* ── Wrong Answer Cards ────────────────────── */
.wb-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  margin-bottom: 14px;
  transition: border-color .15s;
}
.wb-card.mastered {
  border-color: var(--green);
  opacity: .7;
}
.wb-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.wb-subj-tag {
  font-size: .74rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid;
  letter-spacing: .02em;
}
.wb-date {
  font-size: .76rem;
  color: var(--mid);
  margin-left: auto;
}
.wb-attempts {
  color: var(--red);
  font-weight: 600;
}
.wb-mastered-tag {
  font-size: .76rem;
  color: var(--green);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  background: #16a34a18;
}
.wb-passage {
  font-size: .84rem;
  color: var(--mid);
  background: var(--bg);
  border-left: 3px solid var(--border);
  padding: 8px 12px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 10px;
  line-height: 1.6;
  max-height: 120px;
  overflow-y: auto;
}
.wb-diagram {
  font-family: monospace;
  font-size: .8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  overflow-x: auto;
  margin-bottom: 10px;
}
.wb-question {
  font-size: .95rem;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 12px;
  line-height: 1.5;
}
.wb-answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 10px;
}
.wb-opt {
  font-size: .82rem;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--mid);
}
.wb-opt-correct {
  background: #16a34a18;
  border-color: var(--green);
  color: var(--green);
  font-weight: 600;
}
.wb-opt-wrong {
  background: #dc262618;
  border-color: var(--red);
  color: var(--red);
  text-decoration: line-through;
}
.wb-explanation {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}
.wb-en {
  font-size: .83rem;
  color: var(--mid);
  line-height: 1.5;
}
.wb-zh {
  font-size: .82rem;
  color: var(--mid);
  opacity: .85;
  line-height: 1.5;
}
.wb-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.wb-btn-master {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--green);
  background: transparent;
  color: var(--green);
  font-size: .8rem;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.wb-btn-master:hover { background: var(--green); color: #fff; }
.wb-btn-remove {
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--mid);
  font-size: .8rem;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.wb-btn-remove:hover { border-color: var(--red); color: var(--red); }

/* ── Empty State ───────────────────────────── */
.wb-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--mid);
}
.wb-empty-icon { font-size: 3rem; margin-bottom: 14px; }
.wb-empty-title { font-size: 1.1rem; font-weight: 600; color: var(--fg); margin-bottom: 6px; }
.wb-empty-sub { font-size: .88rem; line-height: 1.5; }

/* ── Practice View ─────────────────────────── */
#wb-practice-view {
  display: none;
}
.wb-p-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.wb-p-back {
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--mid);
  font-size: .85rem;
  cursor: pointer;
  transition: border-color .15s;
}
.wb-p-back:hover { border-color: var(--fg); color: var(--fg); }
.wb-p-meta {
  font-size: .82rem;
  color: var(--mid);
}
.wb-p-prog-bar {
  height: 4px;
  background: var(--border);
  border-radius: 4px;
  margin-bottom: 18px;
  overflow: hidden;
}
.wb-p-prog-fill {
  height: 100%;
  background: var(--gold);
  border-radius: 4px;
  transition: width .3s ease;
}
.wb-p-fzzh {
  font-size: .84rem;
  color: var(--mid);
  padding: 8px 14px;
  background: var(--bg);
  border-radius: 0 0 10px 10px;
  border: 1px solid var(--border);
  border-top: none;
  display: none;
}
.wb-p-next-btn {
  display: none;
  margin-top: 14px;
  width: 100%;
  padding: 12px;
  background: var(--gold);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s;
}
.wb-p-next-btn:hover { opacity: .88; }

/* ── Responsive ────────────────────────────── */
@media (max-width: 500px) {
  .wb-answers { grid-template-columns: 1fr; }
  .wb-stats-bar .wb-stat { min-width: 60px; padding: 10px 6px; }
}

/* ── Spaced Repetition Badges ──────────────── */
.wb-sr-badge {
  font-size: .72rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--mid);
  white-space: nowrap;
}
.wb-sr-badge.sr-due {
  background: #f59e0b18;
  border-color: #f59e0b60;
  color: #d97706;
  font-weight: 600;
}
.wb-card.due-today {
  border-color: #f59e0b50;
  background: linear-gradient(135deg, var(--card), #f59e0b06);
}
.wb-pill-due.sel {
  background: #f59e0b !important;
  border-color: #f59e0b !important;
}
.wb-pill-due:hover { background: #f59e0b; border-color: #f59e0b; }
.wb-sr-hint {
  font-size: .78rem;
  opacity: .8;
  margin-left: 4px;
}

/* ── Daily Challenge Card (home page) ──────── */
.dc-ready {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.dc-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
}
.dc-desc {
  font-size: .83rem;
  color: var(--mid);
}
.dc-start-btn {
  padding: 9px 22px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  border: none;
  border-radius: 24px;
  font-weight: 700;
  font-size: .9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .15s, transform .1s;
  box-shadow: 0 2px 8px #f59e0b40;
}
.dc-start-btn:hover { opacity: .88; transform: translateY(-1px); }
.dc-done {
  text-align: center;
  padding: 10px 0;
}
.dc-done-icon { font-size: 1.8rem; margin-bottom: 4px; }
.dc-done-title { font-weight: 700; margin-bottom: 2px; }
.dc-done-sub { font-size: .84rem; color: var(--mid); }

/* ── Daily Challenge Page ───────────────────── */
.dc-page-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.dc-page-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  font-weight: 700;
}
.dc-result-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 24px;
  text-align: center;
  margin-top: 20px;
}
.dc-r-icon { font-size: 2.5rem; margin-bottom: 10px; }
.dc-r-pct  { font-size: 3rem; font-weight: 800; font-family: 'Playfair Display', serif; color: var(--gold); }
.dc-r-score  { font-size: 1rem; color: var(--mid); margin: 6px 0; }
.dc-r-msg    { font-size: 1.1rem; font-weight: 600; margin: 8px 0; }
.dc-r-streak { font-size: .9rem; color: var(--mid); margin-top: 4px; }

/* ── Weak Area Diagnosis ────────────────────── */
.wa-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 4px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.wa-row:last-child { border-bottom: none; }
.wa-left  { grid-column: 1; grid-row: 1; }
.wa-right { grid-column: 2; grid-row: 1; display: flex; align-items: center; gap: 10px; }
.wa-bar-bg {
  grid-column: 1 / -1;
  grid-row: 2;
  height: 5px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.wa-bar-fill { height: 100%; border-radius: 4px; transition: width .4s ease; }
.wa-subj  { font-weight: 600; font-size: .9rem; }
.wa-count { font-size: .76rem; color: var(--mid); margin-top: 1px; }
.wa-pct   { font-size: 1rem; font-weight: 700; min-width: 38px; text-align: right; }
.wa-badge {
  font-size: .7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  letter-spacing: .02em;
}
.wa-red   { background: #dc262618; color: var(--red); }
.wa-amber { background: #f59e0b18; color: #d97706; }
.wa-green { background: #16a34a18; color: var(--green); }