/* ══════════════════════════════════════════════════════════
   VocabMaster — smart-review.css
   Overlay panel for adaptive smart review sessions
   ══════════════════════════════════════════════════════════ */

/* ── Overlay shell ──────────────────────────────────────── */
#panel-smart-review {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#panel-smart-review.hidden { display: none; }

/* ── Header: progress bar + timer ──────────────────────── */
.sr-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 12px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sr-close-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  line-height: 1;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}
.sr-close-btn:hover { background: var(--danger-light); color: var(--danger); }

.sr-progress-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sr-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.sr-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #818CF8);
  border-radius: var(--radius-pill);
  transition: width 0.4s ease;
}

.sr-counter {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 40px;
  text-align: right;
}

.sr-timer {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  min-width: 36px;
  text-align: right;
}

/* ── Question screen ────────────────────────────────────── */
#srQuestionScreen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  padding: 32px 20px 24px;
  gap: 20px;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
}

/* ── Mode badge ─────────────────────────────────────────── */
.sr-mode-badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  align-self: center;
}

/* ── Prompt area ────────────────────────────────────────── */
.sr-prompt-wrap {
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sr-prompt-main {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  word-break: break-word;
}

.sr-prompt-sub {
  font-size: 1rem;
  color: var(--text-muted);
  font-style: italic;
  min-height: 1.4em;
}

.sr-instruction {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 2px;
}

/* ── MCQ options ────────────────────────────────────────── */
#srMCQArea {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.sr-opt {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  word-break: break-word;
}
.sr-opt:not(:disabled):hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-1px);
}
.sr-opt:disabled { cursor: default; }

.sr-opt-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 5px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}

.sr-opt-correct {
  border-color: var(--success) !important;
  background: var(--success-light) !important;
  color: var(--success) !important;
}
.sr-opt-correct .sr-opt-key {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

.sr-opt-wrong {
  border-color: var(--danger) !important;
  background: var(--danger-light) !important;
  color: var(--danger) !important;
}
.sr-opt-wrong .sr-opt-key {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

/* ── Typing area ────────────────────────────────────────── */
#srTypingArea {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.sr-typing-input {
  width: 100%;
  padding: 14px 18px;
  font-size: 1.1rem;
  font-weight: 600;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  color: var(--text);
  text-align: center;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sr-typing-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 15%, transparent);
}
.sr-input-correct {
  border-color: var(--success) !important;
  background: var(--success-light) !important;
  color: var(--success) !important;
  box-shadow: none !important;
}
.sr-input-wrong {
  border-color: var(--danger) !important;
  background: var(--danger-light) !important;
  color: var(--danger) !important;
  box-shadow: none !important;
}

.sr-check-btn {
  padding: 11px 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.sr-check-btn:hover:not(:disabled) { background: var(--primary-hover, #4338CA); transform: translateY(-1px); }
.sr-check-btn:disabled { opacity: 0.5; cursor: default; transform: none; }

/* ── Feedback block ─────────────────────────────────────── */
#srFeedback {
  width: 100%;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: var(--radius-lg);
  border: 1.5px solid transparent;
  animation: srFadeIn 0.2s ease;
}

@keyframes srFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sr-fb-ok {
  background: var(--success-light);
  border-color: var(--success);
}
.sr-fb-err {
  background: var(--danger-light);
  border-color: var(--danger);
}

.sr-fb-icon {
  font-size: 1.3rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1.4;
}
.sr-fb-ok .sr-fb-icon { color: var(--success); }
.sr-fb-err .sr-fb-icon { color: var(--danger); }

.sr-fb-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.sr-fb-title {
  font-weight: 700;
  color: var(--text);
  font-size: 0.92rem;
}

.sr-fb-example {
  color: var(--text);
  font-style: italic;
}

.sr-fb-vi {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.sr-fb-requeue {
  margin-top: 2px;
  font-size: 0.78rem;
  color: var(--warning, #D97706);
  font-weight: 600;
}

/* ── Next button ────────────────────────────────────────── */
#srNextBtn {
  padding: 12px 36px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  align-self: center;
}
#srNextBtn:hover { background: var(--primary-hover, #4338CA); transform: translateY(-1px); }

/* ── Done screen ────────────────────────────────────────── */
#srDoneScreen {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-y: auto;
  padding: 32px 20px 48px;
}

.sr-done-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: 560px;
}

.sr-done-emoji {
  font-size: 3.5rem;
  line-height: 1;
}

.sr-done-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  text-align: center;
}

.sr-done-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  width: 100%;
}

.sr-done-stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 10px;
  text-align: center;
}

.sr-done-stat-val {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.sr-done-stat-lbl {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

.sr-done-section {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.sr-done-section-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.sr-done-perfect {
  text-align: center;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--success);
  background: var(--success-light);
  border-color: var(--success);
}

/* Wrong word list */
.sr-wrong-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.sr-wrong-item:last-child { border-bottom: none; }

.sr-wrong-word {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  min-width: 90px;
}

.sr-wrong-meaning {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Recommendations */
.sr-rec {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.sr-rec:last-child { border-bottom: none; }

.sr-rec-icon { font-size: 1.1rem; flex-shrink: 0; }
.sr-rec-txt  { flex: 1; color: var(--text); }

.sr-rec-btn {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--primary-light);
  color: var(--primary);
  border: none;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
}
.sr-rec-btn:hover { background: var(--primary); color: #fff; }

/* Action buttons row */
.sr-done-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  width: 100%;
}

.sr-done-retry,
.sr-done-close {
  flex: 1;
  max-width: 200px;
  padding: 13px 20px;
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: background 0.15s, transform 0.1s;
}
.sr-done-retry {
  background: var(--primary);
  color: #fff;
}
.sr-done-retry:hover { background: var(--primary-hover, #4338CA); transform: translateY(-1px); }

.sr-done-close {
  background: var(--card);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.sr-done-close:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }

/* ── Mobile ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  #srQuestionScreen { padding: 20px 16px 20px; gap: 16px; }
  #srMCQArea { grid-template-columns: 1fr; }
  .sr-done-stats { grid-template-columns: repeat(2, 1fr); }
  .sr-done-actions { flex-direction: column; align-items: center; }
  .sr-done-retry, .sr-done-close { max-width: 100%; }
  .sr-prompt-main { font-size: 1.8rem; }
}