/* =============================================
   SAT Digital Prep – Bluebook-Inspired Styles
   ============================================= */

:root {
  --sat-blue:        #1e3a5f;
  --sat-blue-light:  #2d5a9e;
  --sat-accent:      #4a9eff;
  --sat-green:       #16a34a;
  --sat-green-bg:    #dcfce7;
  --sat-red:         #dc2626;
  --sat-red-bg:      #fee2e2;
  --sat-yellow:      #d97706;
  --sat-yellow-bg:   #fef3c7;
  --sat-gray-50:     #f8fafc;
  --sat-gray-100:    #f1f5f9;
  --sat-gray-200:    #e2e8f0;
  --sat-gray-400:    #94a3b8;
  --sat-gray-600:    #475569;
  --sat-gray-700:    #334155;
  --sat-gray-900:    #0f172a;
  --sat-white:       #ffffff;
  --sat-radius:      10px;
  --sat-shadow:      0 2px 12px rgba(0,0,0,0.08);
  --sat-shadow-lg:   0 8px 32px rgba(0,0,0,0.12);
  --sat-font:        'Segoe UI', system-ui, -apple-system, sans-serif;
}

.sat-theme-dark {
  --sat-gray-50:    #0f172a;
  --sat-gray-100:   #1e293b;
  --sat-gray-200:   #334155;
  --sat-gray-400:   #64748b;
  --sat-gray-600:   #94a3b8;
  --sat-gray-700:   #cbd5e1;
  --sat-gray-900:   #f1f5f9;
  --sat-white:      #1e293b;
  --sat-shadow:     0 2px 12px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; }

.sat-prep-wrap {
  font-family: var(--sat-font);
  font-size: 16px;
  color: var(--sat-gray-900);
  background: var(--sat-gray-50);
  min-height: 300px;
  border-radius: var(--sat-radius);
  overflow: hidden;
}

/* ---- Header ---- */
.sat-header {
  background: var(--sat-blue);
  color: #fff;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.sat-header-left { display: flex; align-items: center; gap: 14px; }
.sat-logo-icon { width: 40px; height: 40px; flex-shrink: 0; }
.sat-title { margin: 0; font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em; }
.sat-subtitle { margin: 2px 0 0; font-size: 0.8rem; opacity: 0.75; }

.sat-score-badge {
  background: rgba(255,255,255,0.15);
  border-radius: 8px;
  padding: 8px 16px;
  text-align: center;
  min-width: 70px;
}
.sat-score-badge #sat-score-text { display: block; font-size: 1.3rem; font-weight: 700; }
.sat-score-label { font-size: 0.7rem; opacity: 0.75; letter-spacing: 0.05em; text-transform: uppercase; }

/* ---- Selector Panel ---- */
.sat-selector-panel {
  padding: 24px;
  background: var(--sat-white);
  border-bottom: 1px solid var(--sat-gray-200);
}
.sat-panel-title {
  margin: 0 0 16px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sat-gray-600);
}
.sat-domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}
.sat-domain-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  padding: 14px 16px;
  background: var(--sat-gray-50);
  border: 2px solid var(--sat-gray-200);
  border-radius: var(--sat-radius);
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: left;
}
.sat-domain-btn:hover {
  border-color: var(--sat-accent);
  background: #eff6ff;
}
.sat-domain-btn.active {
  border-color: var(--sat-blue-light);
  background: #eff6ff;
  box-shadow: 0 0 0 3px rgba(74,158,255,0.15);
}
.sat-domain-icon { font-size: 1.4rem; line-height: 1; }
.sat-domain-name { font-size: 0.9rem; font-weight: 600; color: var(--sat-gray-900); }
.sat-domain-desc { font-size: 0.75rem; color: var(--sat-gray-600); }

/* Subtypes */
.sat-subtype-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.sat-sub-btn {
  padding: 7px 14px;
  font-size: 0.82rem;
  background: var(--sat-gray-100);
  border: 1.5px solid var(--sat-gray-200);
  border-radius: 20px;
  cursor: pointer;
  color: var(--sat-gray-700);
  transition: all 0.15s;
  font-weight: 500;
}
.sat-sub-btn:hover { border-color: var(--sat-accent); color: var(--sat-blue-light); }
.sat-sub-btn.active {
  background: var(--sat-blue);
  color: #fff;
  border-color: var(--sat-blue);
}

/* Generate row */
.sat-generate-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.sat-count-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--sat-gray-700);
  font-weight: 500;
}
.sat-count-picker select {
  padding: 8px 10px;
  border: 1.5px solid var(--sat-gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  color: var(--sat-gray-900);
  background: var(--sat-white);
}
.sat-btn-primary {
  padding: 11px 24px;
  background: var(--sat-blue-light);
  color: #fff;
  border: none;
  border-radius: var(--sat-radius);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, transform 0.12s;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sat-btn-primary:hover { background: var(--sat-blue); }
.sat-btn-primary:active { transform: scale(0.98); }
.sat-btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

/* Spinner */
@keyframes sat-spin { to { transform: rotate(360deg); } }
.sat-spinner {
  width: 18px; height: 18px;
  animation: sat-spin 0.8s linear infinite;
}

/* ---- Error Box ---- */
.sat-error-box {
  margin: 16px 24px 0;
  padding: 12px 16px;
  background: var(--sat-red-bg);
  border: 1px solid var(--sat-red);
  border-radius: 8px;
  color: var(--sat-red);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sat-error-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--sat-red);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0;
  line-height: 1;
}

/* ---- Questions Area ---- */
#sat-questions-area {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ---- Single Question Card ---- */
.sat-question-card {
  background: var(--sat-white);
  border: 1.5px solid var(--sat-gray-200);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--sat-shadow);
  transition: box-shadow 0.2s;
}
.sat-question-card:hover { box-shadow: var(--sat-shadow-lg); }

.sat-q-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--sat-gray-100);
  border-bottom: 1px solid var(--sat-gray-200);
  flex-wrap: wrap;
}
.sat-q-num {
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--sat-blue);
  background: #dbeafe;
  padding: 3px 10px;
  border-radius: 20px;
}
.sat-q-domain {
  font-size: 0.78rem;
  color: var(--sat-gray-600);
  background: var(--sat-gray-200);
  padding: 3px 10px;
  border-radius: 20px;
}
.sat-q-skill {
  font-size: 0.78rem;
  color: var(--sat-blue-light);
  font-style: italic;
}
.sat-q-difficulty {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
}
.sat-diff-hard { background: var(--sat-yellow-bg); color: var(--sat-yellow); }
.sat-diff-veryhard { background: var(--sat-red-bg); color: var(--sat-red); }

.sat-q-body { padding: 20px 24px; }

/* Passage */
.sat-passage-box {
  background: var(--sat-gray-50);
  border-left: 4px solid var(--sat-accent);
  border-radius: 0 8px 8px 0;
  padding: 16px 18px;
  margin-bottom: 20px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--sat-gray-700);
}
.sat-passage-source {
  font-size: 0.78rem;
  color: var(--sat-gray-400);
  margin-bottom: 8px;
  font-style: italic;
}
.sat-passage-text { margin: 0; }

/* Question Stem */
.sat-question-stem {
  font-size: 1rem;
  font-weight: 600;
  color: var(--sat-gray-900);
  line-height: 1.6;
  margin-bottom: 18px;
}

/* Answer Choices */
.sat-choices { display: flex; flex-direction: column; gap: 10px; }
.sat-choice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border: 2px solid var(--sat-gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--sat-white);
  text-align: left;
  width: 100%;
  font-size: 0.95rem;
  color: var(--sat-gray-900);
  line-height: 1.55;
}
.sat-choice:hover:not(:disabled) {
  border-color: var(--sat-accent);
  background: #f0f7ff;
}
.sat-choice-letter {
  font-weight: 700;
  font-size: 0.9rem;
  width: 26px;
  height: 26px;
  min-width: 26px;
  border-radius: 50%;
  background: var(--sat-gray-200);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sat-gray-700);
  margin-top: 1px;
  transition: all 0.15s;
}
.sat-choice-text { flex: 1; }

/* Choice states */
.sat-choice.sat-selected {
  border-color: var(--sat-blue-light);
  background: #eff6ff;
}
.sat-choice.sat-selected .sat-choice-letter {
  background: var(--sat-blue-light);
  color: #fff;
}
.sat-choice.sat-correct {
  border-color: var(--sat-green);
  background: var(--sat-green-bg);
}
.sat-choice.sat-correct .sat-choice-letter {
  background: var(--sat-green);
  color: #fff;
}
.sat-choice.sat-wrong {
  border-color: var(--sat-red);
  background: var(--sat-red-bg);
}
.sat-choice.sat-wrong .sat-choice-letter {
  background: var(--sat-red);
  color: #fff;
  text-decoration: line-through;
}
.sat-choice:disabled { cursor: default; }

/* Submit / Explanation */
.sat-submit-row {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.sat-submit-btn {
  padding: 10px 22px;
  background: var(--sat-blue-light);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.sat-submit-btn:hover { background: var(--sat-blue); }
.sat-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.sat-result-badge {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  display: none;
}
.sat-result-badge.correct { background: var(--sat-green-bg); color: var(--sat-green); display: inline-block; }
.sat-result-badge.wrong { background: var(--sat-red-bg); color: var(--sat-red); display: inline-block; }

.sat-explanation {
  margin-top: 16px;
  padding: 16px 18px;
  background: #fafafa;
  border: 1px solid var(--sat-gray-200);
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--sat-gray-700);
  display: none;
}
.sat-explanation.visible { display: block; }
.sat-explanation-title {
  font-weight: 700;
  color: var(--sat-blue);
  margin-bottom: 6px;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Loading skeleton ---- */
.sat-loading-skeleton {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
@keyframes sat-shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}
.sat-skeleton-block {
  background: linear-gradient(90deg, var(--sat-gray-200) 25%, var(--sat-gray-100) 50%, var(--sat-gray-200) 75%);
  background-size: 800px 100%;
  animation: sat-shimmer 1.5s infinite linear;
  border-radius: 6px;
}
.sat-skel-header { height: 48px; }
.sat-skel-passage { height: 100px; }
.sat-skel-question { height: 28px; width: 70%; }
.sat-skel-choice { height: 46px; }

/* ---- Results Panel ---- */
.sat-results-panel {
  margin: 16px 24px 24px;
  background: var(--sat-white);
  border: 2px solid var(--sat-blue-light);
  border-radius: 12px;
  overflow: hidden;
}
.sat-results-header {
  background: var(--sat-blue);
  color: #fff;
  padding: 14px 24px;
}
.sat-results-header h3 { margin: 0; font-size: 1.1rem; }
.sat-results-body {
  display: flex;
  justify-content: center;
  gap: 36px;
  padding: 24px;
}
.sat-result-stat { text-align: center; }
.sat-stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--sat-blue-light);
  line-height: 1;
}
.sat-stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--sat-gray-600);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
#sat-reset-btn { margin: 0 24px 24px; }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .sat-domain-grid { grid-template-columns: 1fr 1fr; }
  .sat-header { flex-direction: column; align-items: flex-start; }
  .sat-results-body { gap: 20px; }
  .sat-q-meta { gap: 6px; }
  #sat-questions-area { padding: 16px; }
  .sat-selector-panel { padding: 16px; }
}