/* ─────────────────────────────────────────────
   DSA Pattern Recognition Trainer
   ───────────────────────────────────────────── */

.pt-gradient {
  background: linear-gradient(135deg, #f59e0b 0%, #a78bfa 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* Stats bar */
.pt-stats-bar {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  padding: 1rem 1.5rem;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

.pt-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  min-width: 70px;
}

.pt-stat span {
  font-family: Orbitron, sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.pt-stat label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pt-accuracy span { color: #22c55e; }

/* Layout */
.pt-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.5rem;
  align-items: start;
}

/* Question card */
.pt-question-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2rem;
  backdrop-filter: blur(10px);
  box-shadow: var(--glass-shadow);
}

.pt-q-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.pt-q-num {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.pt-diff-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

.pt-diff-badge.easy   { background: rgba(34,197,94,0.12);  color: #22c55e; border: 1px solid rgba(34,197,94,0.3);  }
.pt-diff-badge.medium { background: rgba(245,158,11,0.12); color: #f59e0b; border: 1px solid rgba(245,158,11,0.3); }
.pt-diff-badge.hard   { background: rgba(239,68,68,0.12);  color: #ef4444; border: 1px solid rgba(239,68,68,0.3);  }

.pt-q-company {
  font-size: 0.8rem;
  font-weight: 600;
  color: #f59e0b;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pt-q-text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.pt-constraints {
  font-family: "Fira Code", monospace;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* Options grid */
.pt-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.pt-option-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 2px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-family: Poppins, sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
}

.pt-option-btn:hover:not(:disabled) {
  border-color: #a78bfa;
  background: rgba(167,139,250,0.08);
  transform: translateY(-2px);
}

.pt-option-btn.correct {
  border-color: #22c55e;
  background: rgba(34,197,94,0.12);
  color: #22c55e;
}

.pt-option-btn.wrong {
  border-color: #ef4444;
  background: rgba(239,68,68,0.1);
  color: #ef4444;
}

.pt-option-btn.reveal {
  border-color: #22c55e;
  background: rgba(34,197,94,0.08);
  color: #22c55e;
}

.pt-option-btn:disabled { cursor: not-allowed; opacity: 0.7; }

.pt-option-icon { font-size: 1.1rem; flex-shrink: 0; }

/* Feedback */
.pt-feedback {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 12px;
  margin-bottom: 1.25rem;
  align-items: flex-start;
}

.pt-feedback.correct { background: rgba(34,197,94,0.08);  border: 1px solid rgba(34,197,94,0.25); }
.pt-feedback.wrong   { background: rgba(239,68,68,0.08);  border: 1px solid rgba(239,68,68,0.25); }

.pt-feedback-icon { font-size: 1.5rem; flex-shrink: 0; }

.pt-feedback-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.pt-feedback.correct .pt-feedback-title { color: #22c55e; }
.pt-feedback.wrong   .pt-feedback-title { color: #ef4444; }

.pt-feedback-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.pt-next-btn { width: 100%; justify-content: center; }

/* Sidebar */
.pt-sidebar { display: flex; flex-direction: column; gap: 1rem; }

.pt-sidebar-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.25rem;
  backdrop-filter: blur(10px);
}

.pt-sidebar-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Pattern reference list */
.pt-pattern-list { display: flex; flex-direction: column; gap: 0.5rem; }

.pt-pattern-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.pt-pattern-item:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.pt-pattern-item .pt-p-icon { font-size: 1rem; width: 20px; text-align: center; }
.pt-pattern-item .pt-p-name { font-weight: 600; }

/* Breakdown bars */
.pt-breakdown { display: flex; flex-direction: column; gap: 0.6rem; }

.pt-bd-row { display: flex; flex-direction: column; gap: 0.2rem; }

.pt-bd-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.pt-bd-bar {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
}

.pt-bd-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--gradient-1);
  transition: width 0.4s ease;
}

.pt-full-btn { width: 100%; justify-content: center; }

/* Result modal */
.pt-result-modal { max-width: 480px; }

.pt-result-body {
  text-align: center;
  padding: 1rem 0;
}

.pt-result-score {
  font-family: Orbitron, sans-serif;
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, #f59e0b, #a78bfa);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0.5rem 0;
}

.pt-result-label { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }

.pt-result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

.pt-result-stat {
  background: var(--dark-card);
  border-radius: 12px;
  padding: 0.75rem;
  text-align: center;
}

.pt-result-stat span { display: block; font-size: 1.4rem; font-weight: 700; color: var(--accent); }
.pt-result-stat label { font-size: 0.72rem; color: var(--text-secondary); }

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 1024px) { .pt-layout { grid-template-columns: 1fr; } }
@media (max-width: 640px)  { .pt-options { grid-template-columns: 1fr; } }
@media (max-width: 480px)  { .pt-stats-bar { gap: 0.6rem; } .pt-stat span { font-size: 1.2rem; } }