/* ═══════════════════════════════════════════════════════════════════
   DeepVault Game Math Practice — Styles
   ═══════════════════════════════════════════════════════════════════ */

/* ── Dashboard Cards ──────────────────────────────────────────── */
.ex-card {
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
  padding: 14px 16px;
}
.ex-card:hover {
  border-color: #d2991d;
  box-shadow: 0 0 0 1px #d2991d;
}

.ex-card-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.ex-level-badge {
  margin-left: auto;
  background: #d2991d;
  color: #0d1117;
  font-size: 0.75rem;
  font-weight: 700;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ex-card-progress {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ex-card-bar {
  flex: 1;
  height: 4px;
  background: rgba(210, 153, 29, 0.15);
  border-radius: 2px;
  overflow: hidden;
}

.ex-card-bar-fill {
  height: 100%;
  background: #d2991d;
  border-radius: 2px;
  transition: width 0.4s ease;
}

.ex-card-pct {
  font-size: 0.7rem;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 32px;
  text-align: right;
}

/* ── Topic Page ───────────────────────────────────────────────── */
.ex-topic-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.ex-back {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-block;
  margin-bottom: 20px;
}
.ex-back:hover { color: var(--accent); }

.ex-topic-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}
.ex-topic-icon { font-size: 3rem; }
.ex-topic-title { font-size: 1.8rem; margin: 0; color: var(--text-primary); }
.ex-topic-desc { color: var(--text-secondary); margin: 4px 0 0; }

.ex-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.ex-stat {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius, 8px);
  padding: 16px;
  text-align: center;
}
.ex-stat-value { font-size: 1.5rem; color: #58a6ff; font-weight: 600; }
.ex-stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

.ex-rules {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius, 8px);
  padding: 16px 20px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ── Level Grid ───────────────────────────────────────────────── */
.ex-levels {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 24px;
}
.ex-level-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius, 8px);
  padding: 14px;
  text-align: center;
  transition: border-color 0.2s;
}
.ex-level-card.ex-current { border-color: #58a6ff; }
.ex-level-card.ex-completed { border-color: #3fb950; }
.ex-level-card.ex-locked { opacity: 0.5; }
.ex-level-status { font-size: 1.2rem; margin-bottom: 6px; }
.ex-level-num { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; }
.ex-level-title { font-size: 0.85rem; color: var(--text-primary); margin: 4px 0; }
.ex-level-stars { font-size: 0.75rem; margin-top: 4px; }

/* ── Scratch Pad ─────────────────────────────────────────────── */
.ex-scratch {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius, 6px);
  color: var(--text-secondary);
  padding: 10px 14px;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  resize: vertical;
  margin-bottom: 12px;
  line-height: 1.5;
}
.ex-scratch:focus { outline: none; border-color: #8b949e; }
.ex-scratch::placeholder { color: var(--text-muted); }

.ex-scratch-toolbar {
  display: flex;
  gap: 3px;
  margin-bottom: 6px;
}

.ex-sym-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 3px 7px;
  cursor: pointer;
  font-family: 'Courier New', monospace;
  transition: background 0.15s, border-color 0.15s;
}

.ex-sym-btn:hover {
  background: rgba(88, 166, 255, 0.1);
  border-color: #58a6ff;
  color: var(--text-primary);
}

/* ── 3D Graph Toolbar ──────────────────────────────────────────── */
.ex-3d-toolbar {
  margin-top: 8px;
  padding: 8px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.ex-3d-inp {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  padding: 3px 6px;
  font-size: 0.8rem;
  font-family: monospace;
  text-align: center;
}

.ex-3d-inp:focus { outline: none; border-color: #58a6ff; }

.ex-3d-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.ex-3d-btn:hover { background: rgba(88,166,255,0.1); border-color: #58a6ff; }
.ex-3d-btn-clear:hover { border-color: #f85149; background: rgba(248,81,73,0.1); }

.ex-3d-graph { min-height: 200px; }

/* ── Visual Diagrams ────────────────────────────────────────── */

.ex-visual-wrap {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius, 8px);
  padding: 16px;
  margin-bottom: 12px;
  text-align: center;
}

/* ── Practice Session ─────────────────────────────────────────── */
.ex-session {
  max-width: 700px;
  margin: 0 auto;
  padding: 20px 0;
}

.ex-session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.ex-session-progress { font-size: 0.9rem; color: var(--text-secondary); }
.ex-session-streak { font-size: 0.9rem; color: #d2991d; font-weight: 600; }

.ex-scenario {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 3px solid #58a6ff;
  border-radius: var(--radius, 8px);
  padding: 20px 24px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.ex-input-area {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.ex-answer-input {
  flex: 1;
  background: var(--bg-primary, #0d1117);
  border: 1px solid var(--border);
  border-radius: var(--radius, 6px);
  color: var(--text-primary);
  padding: 10px 14px;
  font-size: 1rem;
  font-family: 'Courier New', monospace;
}
.ex-answer-input:focus { outline: none; border-color: #58a6ff; }
.ex-units {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.ex-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.ex-feedback {
  padding: 12px 16px;
  border-radius: var(--radius, 6px);
  margin-bottom: 12px;
  font-weight: 600;
}
.ex-feedback-correct {
  background: rgba(63, 185, 80, 0.1);
  border: 1px solid rgba(63, 185, 80, 0.3);
  color: #3fb950;
}
.ex-feedback-incorrect {
  background: rgba(248, 81, 73, 0.1);
  border: 1px solid rgba(248, 81, 73, 0.3);
  color: #f85149;
}

.ex-solution {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 3px solid #3fb950;
  border-radius: var(--radius, 6px);
  padding: 12px 16px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.ex-hint {
  background: var(--bg-secondary);
  border-left: 2px solid #d2991d;
  border-radius: var(--radius, 4px);
  padding: 8px 14px;
  margin-bottom: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── Results Page ─────────────────────────────────────────────── */
.ex-results {
  max-width: 600px;
  margin: 40px auto;
  text-align: center;
}
.ex-result-hero {
  padding: 30px;
  margin-bottom: 20px;
}
.ex-result-hero h2 { font-size: 1.8rem; margin: 12px 0 8px; }
.ex-result-icon { font-size: 4rem; }
.ex-clears { color: #d2991d; font-weight: 600; }
.ex-levelup {
  background: rgba(88, 166, 255, 0.1);
  border: 1px solid rgba(88, 166, 255, 0.3);
  border-radius: var(--radius, 8px);
  padding: 20px;
  margin-bottom: 20px;
}
.ex-levelup-icon { font-size: 2rem; }
.ex-levelup h3 { color: #58a6ff; margin: 8px 0 0; }
.ex-results-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}
.ex-results-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Mobile ───────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .ex-stats { grid-template-columns: repeat(2, 1fr); }
  .ex-levels { grid-template-columns: repeat(2, 1fr); }
  .ex-topic-header { flex-direction: column; text-align: center; }
  .ex-results-bar { grid-template-columns: 1fr; }
  .ex-results-actions { flex-direction: column; align-items: center; }
}