/* AcidBase Mastery — Reaction Charts Page */

/* ── Category Tabs ──────────────────────────────────── */

.chart-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.chart-tabs .viz-btn {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.6rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--transition);
}

.chart-tabs .viz-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.chart-tabs .viz-btn.active {
  background: rgba(90, 138, 135, 0.12);
  border-color: var(--teal);
  color: var(--teal);
}

/* ── Scenario Grid ──────────────────────────────────── */

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
  gap: 2rem;
}

/* ── Scenario Card ──────────────────────────────────── */

.scenario-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  overflow: hidden;
}

.scenario-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--divider);
}

.scenario-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.scenario-equation {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--teal);
  letter-spacing: 0.02em;
}

.scenario-chart-container {
  position: relative;
  height: 280px;
  padding: 1rem 1.5rem 0.5rem;
}

.scenario-chart-container.titration {
  height: 400px;
}

.scenario-chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}

.scenario-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.scenario-ph {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.scenario-callout {
  font-size: 0.7rem;
  color: var(--text-dim);
  line-height: 1.5;
  text-align: right;
}

/* ── Titration full-width layout ────────────────────── */

.scenario-card.titration-card {
  grid-column: 1 / -1;
}

/* ── Responsive ─────────────────────────────────────── */

@media (max-width: 900px) {
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .scenario-chart-container {
    height: 240px;
  }

  .scenario-chart-container.titration {
    height: 320px;
  }

  .scenario-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .scenario-callout {
    text-align: left;
  }
}

@media (max-width: 600px) {
  .chart-tabs {
    gap: 0.5rem;
  }

  .chart-tabs .viz-btn {
    font-size: 0.55rem;
    padding: 0.5rem 0.75rem;
  }

  .scenario-chart-container {
    height: 200px;
    padding: 0.75rem 1rem 0.25rem;
  }

  .scenario-chart-container.titration {
    height: 260px;
  }

  .scenario-header {
    padding: 1rem;
  }

  .scenario-footer {
    padding: 0.75rem 1rem;
  }
}