/* growth-curve.css */

:root {
  --bg: #fafaf8;
  --ink: #111111;
  --mid: #555555;
  --faint: #ddddd8;
  --accent: #2a5c3f;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
}

/* ===== NAV ===== */

nav {
  padding: 20px 32px;
  border-bottom: 1px solid var(--faint);
  max-width: 1400px;
  margin: 0 auto;
}

.back-link {
  font-family: 'Source Serif 4', serif;
  font-size: 17px;
  color: var(--mid);
  text-decoration: none;
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--ink);
}

/* ===== PAGE WRAPPER ===== */

.page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 32px;
}

.page-title {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--faint);
}

/* ===== ERROR DISPLAY ===== */

.error-message {
  display: none;
  border: 1px solid var(--faint);
  border-left: 3px solid #c0392b;
  padding: 12px 16px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--ink);
}

/* ===== MAIN GRID ===== */

.calc-main-grid {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 48px;
  align-items: start;
}

.calc-left-column {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.calc-right-column {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ===== SECTION LABELS ===== */

.section-label {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 20px;
}

/* ===== CHART SECTION ===== */

.calc-chart-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.calc-chart-container {
  border: 1px solid var(--faint);
  padding: 16px;
}

.calc-chart-title {
  font-size: 17px;
  color: var(--mid);
  margin-bottom: 12px;
  text-align: center;
}

#growthChart {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* ===== SUBCULTURE TIMING SLIDER ===== */

.timing-control {
  border: 1px solid var(--faint);
  padding: 16px;
}

.timing-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}

.timing-label span {
  font-size: 17px;
  color: var(--mid);
}

.timing-value {
  font-family: 'Source Code Pro', monospace;
  font-size: 17px;
  color: var(--accent);
}

.calc-slider {
  width: 100%;
  height: 2px;
  background: var(--faint);
  border: none;
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  display: block;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.calc-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* ===== KEY CONTROLS PANEL ===== */

.calc-key-controls-panel {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.calc-input-group {
  margin-bottom: 16px;
}

.calc-input-group:last-child {
  margin-bottom: 0;
}

.calc-input-label {
  display: block;
  font-size: 17px;
  color: var(--mid);
  margin-bottom: 4px;
}

.calc-input-field {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--faint);
  padding: 6px 0;
  font-family: 'Source Serif 4', serif;
  font-size: 17px;
  color: var(--ink);
  outline: none;
  width: 100%;
  transition: border-color 0.15s;
}

.calc-input-field:focus {
  border-color: var(--accent);
}

/* ===== OPTIMIZATION BENEFITS ===== */

.calc-optimization-benefits {
  border: 1px solid var(--faint);
  padding: 24px;
}

.calc-optimization-header {
  margin-bottom: 20px;
}

.calc-optimization-header p {
  font-size: 14px;
  color: var(--mid);
  margin-top: 4px;
}

.calc-optimization-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--faint);
}

.calc-benefit-item {
  padding: 20px;
  border-right: 1px solid var(--faint);
  border-bottom: 1px solid var(--faint);
}

.calc-benefit-item:nth-child(2n) {
  border-right: none;
}

.calc-benefit-item:nth-last-child(-n+2) {
  border-bottom: none;
}

.calc-benefit-label {
  font-size: 14px;
  color: var(--mid);
  margin-bottom: 6px;
}

.calc-benefit-value {
  font-family: 'Source Code Pro', monospace;
  font-size: 22px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1.2;
}

.calc-benefit-assumption {
  font-size: 14px;
  color: var(--mid);
  margin-top: 4px;
}

/* ===== SCENARIO PANELS ===== */

.calc-scenarios-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.calc-scenario-panel {
  border: 1px solid var(--faint);
  padding: 24px;
}

.calc-reference-panel {
  border-left: 3px solid var(--faint);
}

.calc-selected-panel {
  border-left: 3px solid var(--accent);
}

.calc-scenario-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--faint);
}

.calc-scenario-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.calc-scenario-subtitle {
  font-size: 17px;
  color: var(--mid);
}

/* ===== METRICS SUMMARY ===== */

.calc-metrics-summary {
  margin-bottom: 24px;
}

.calc-metric-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px solid var(--faint);
}

.calc-metric-item:last-child {
  border-bottom: none;
  font-weight: 600;
  padding-top: 10px;
  border-top: 1px solid var(--faint);
}

.calc-metric-label {
  font-size: 14px;
  color: var(--mid);
}

.calc-metric-value {
  font-family: 'Source Code Pro', monospace;
  font-size: 17px;
  color: var(--accent);
}

/* ===== STAGE BREAKDOWN ===== */

.stage-breakdown-label {
  font-size: 17px;
  font-weight: 600;
  color: var(--mid);
  margin-bottom: 10px;
}

.calc-stage-item {
  border: 1px solid var(--faint);
  padding: 12px;
  margin-bottom: 8px;
}

.calc-stage-item:last-child {
  margin-bottom: 0;
}

.calc-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}

.calc-stage-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.calc-stage-duration {
  font-family: 'Source Code Pro', monospace;
  font-size: 14px;
  color: var(--accent);
  background: rgba(42, 92, 63, 0.07);
  padding: 2px 8px;
}

.calc-stage-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.calc-stage-metric {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.calc-stage-metric-label {
  font-size: 14px;
  color: var(--mid);
}

.calc-stage-metric-value {
  font-family: 'Source Code Pro', monospace;
  font-size: 14px;
  color: var(--ink);
}

/* ===== RESPONSIVE ===== */

@media (max-width: 900px) {
  nav {
    padding: 16px 20px;
  }

  .page {
    padding: 32px 20px;
  }

  .calc-main-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .calc-scenarios-container {
    grid-template-columns: 1fr;
  }

  .calc-optimization-metrics {
    grid-template-columns: 1fr 1fr;
  }
}