/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #5b59d6;
  --primary-light: #f0f0ff;
  --primary-lighter: #f7f7fe;
  --primary-dark: #4a48b0;
  --primary-glow: rgba(91, 89, 214, 0.08);
  --green: #059669;
  --green-bg: #ecfdf5;
  --green-border: rgba(5, 150, 105, 0.15);
  --red: #dc2626;
  --red-bg: #fef2f2;
  --red-border: rgba(220, 38, 38, 0.12);
  --amber: #b45309;
  --amber-bg: #fffbeb;
  --amber-border: rgba(180, 83, 9, 0.12);
  --bg: #f8f9fb;
  --white: #ffffff;
  --text: #111827;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --border: #e5e7eb;
  --border-light: #f0f1f3;
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: 0.15s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Header === */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.header-icon {
  width: 28px;
  height: 28px;
}

.header-wordmark {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Share button */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: background var(--transition), transform 0.1s;
  white-space: nowrap;
}

.share-btn:hover {
  background: #e4e4fc;
}

.share-btn:active {
  transform: scale(0.97);
}

.share-btn svg {
  flex-shrink: 0;
}

.share-confirmation {
  font-size: 12px;
  color: var(--green);
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.3s;
  white-space: nowrap;
}

.share-confirmation.visible {
  opacity: 1;
}

/* === Container === */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 32px 40px;
}

/* === Top Row (School + Optimizer) === */
.top-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
  align-items: start;
}

/* === Panel (Card) === */
.panel {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  border: 1px solid var(--border-light);
}

.panel-header-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.panel-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  flex-shrink: 0;
}

.panel-icon-amber {
  background: var(--amber-bg);
  color: var(--amber);
}

.panel-icon-primary {
  background: var(--primary-light);
  color: var(--primary);
}

.panel h2 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.panel-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  padding-left: 46px;
}

/* === Divider === */
.divider {
  height: 1px;
  background: var(--border);
  margin: 18px 0;
}

/* === Input Stack (vertical layout for school inputs) === */
.input-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.input-group input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  font-weight: 600;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-group input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-prefix {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix span {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
}

.input-prefix input[type="number"] {
  padding-left: 28px !important;
}

/* === Slider Groups === */
.slider-group {
  margin-bottom: 16px;
}

.slider-group > label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.label-detail {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-faint);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.slider-row input[type="range"] {
  flex: 1;
}

.slider-label-left,
.slider-label-right {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 72px;
}

.slider-label-left strong,
.slider-label-right strong {
  color: var(--text);
}

.slider-label-right {
  text-align: right;
}

/* Charge type sliders */
.charge-type-sliders {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.charge-slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.charge-slider-row span {
  min-width: 72px;
  font-size: 13px;
  color: var(--text-secondary);
}

.charge-slider-row input[type="range"] {
  flex: 1;
}

.charge-slider-remainder {
  font-size: 13px;
  color: var(--text-faint);
  padding-left: 2px;
  margin-top: 2px;
}

/* === Range Input Styling === */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 5px;
  background: var(--border);
  border-radius: 4px;
  cursor: pointer;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--white);
  border-radius: 50%;
  cursor: pointer;
  border: 2.5px solid var(--primary);
  box-shadow: var(--shadow-xs);
  transition: box-shadow 0.15s, transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 4px var(--primary-glow);
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--white);
  border-radius: 50%;
  cursor: pointer;
  border: 2.5px solid var(--primary);
  box-shadow: var(--shadow-xs);
}

/* Filled track */
input[type="range"] {
  background: linear-gradient(var(--primary), var(--primary)) no-repeat var(--border);
}

/* === Volume Summary === */
.volume-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  background: var(--primary-lighter);
  border: 1px solid rgba(91, 89, 214, 0.08);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 4px;
}

.volume-summary strong {
  font-size: 18px;
  color: var(--primary);
  letter-spacing: -0.3px;
}

/* === Comparison Section === */
.panel-comparison {
  margin-bottom: 0;
}

.comparison-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.comparison-col {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: box-shadow var(--transition);
}

.comparison-col:hover {
  box-shadow: var(--shadow-md);
}

.comparison-col h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.col-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-gray {
  background: var(--text-faint);
}

.inline-icon {
  width: 20px;
  height: 20px;
}

/* Competitor col */
.competitor-col {
  border-color: var(--border);
  background: var(--white);
}

.competitor-col h3 {
  color: var(--text-secondary);
}

/* Onespot col */
.onespot-col {
  border-color: rgba(91, 89, 214, 0.3);
  background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

.onespot-col h3 {
  color: var(--primary);
}

/* === Rate Inputs (Competitor) === */
.rate-inputs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.rate-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.rate-row label {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.input-suffix,
.input-prefix-sm {
  display: flex;
  align-items: center;
  gap: 3px;
  width: 100px;
  flex-shrink: 0;
}

/* $ prefix goes before the input, % suffix goes after */
.input-prefix-sm {
  justify-content: flex-end;
}

.input-suffix {
  justify-content: flex-end;
}

.input-suffix input,
.input-prefix-sm input {
  width: 70px;
  padding: 7px 8px;
  font-size: 13px;
  font-weight: 600;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  text-align: right;
  background: var(--white);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-suffix input:focus,
.input-prefix-sm input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.input-suffix span,
.input-prefix-sm span {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-faint);
  width: 14px;
  flex-shrink: 0;
}

/* === Rate Display (Onespot — static) === */
.rate-display {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.rate-row-static {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.rate-row-static span:first-child {
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
}

.rate-row-static em {
  font-style: normal;
  font-size: 11px;
  color: var(--text-faint);
  background: var(--primary-light);
  padding: 1px 5px;
  border-radius: 4px;
}

.highlight-row {
  margin-top: 4px;
  padding: 8px 10px;
  background: var(--green-bg);
  border-radius: 6px;
  border: 1px solid var(--green-border);
}

.highlight-row span:first-child {
  color: var(--text-muted);
}

.highlight-row span:last-child {
  color: var(--green);
  font-weight: 600;
}

/* === Results Block === */
.results-block {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.results-block h4,
.optimizer-results h4 {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-faint);
  margin-bottom: 6px;
  margin-top: 14px;
}

.results-block h4:first-child,
.optimizer-results h4:first-child {
  margin-top: 0;
}

.result-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
  font-size: 13px;
}

.result-line span {
  color: var(--text-secondary);
}

.result-line strong {
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.total-line {
  border-top: 1.5px solid var(--border);
  margin-top: 6px;
  padding-top: 8px;
}

.total-line span {
  font-weight: 600;
}

.competitor-col .total-line strong {
  color: var(--text);
  font-size: 15px;
}

.onespot-col .total-line strong {
  color: var(--primary);
  font-size: 15px;
}

.rate-line strong {
  color: var(--text-muted);
  font-size: 13px;
}

/* === Savings Banner === */
.savings-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: background var(--transition), color var(--transition);
}

.savings-banner span:first-child {
  font-size: 15px;
}

.savings-banner span:last-child {
  font-size: 13px;
  opacity: 0.85;
}

.savings-banner.saves {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.savings-banner.costs-more {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

.savings-banner.neutral {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(91, 89, 214, 0.1);
}

/* === Service Fee Optimizer === */
.optimizer-inputs {
  margin-bottom: 20px;
}

.slider-row.compact {
  gap: 14px;
}

.slider-row.compact strong {
  min-width: 44px;
  font-size: 15px;
  color: var(--primary);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Break-even hero */
.breakeven-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 20px 16px;
  background: var(--primary-lighter);
  border-radius: var(--radius-md);
  border: 1px solid rgba(91, 89, 214, 0.18);
  margin-bottom: 20px;
}

.breakeven-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--primary);
}

.breakeven-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.15;
  margin: 4px 0;
  letter-spacing: -1px;
  font-variant-numeric: tabular-nums;
}

.breakeven-detail {
  font-size: 12px;
  color: var(--text-muted);
}

/* Optimizer results */
.optimizer-results {
  margin-bottom: 16px;
}

.positive {
  color: var(--green) !important;
}

.negative {
  color: var(--red) !important;
}

/* Status badge */
.status-badge {
  display: inline-flex;
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 700;
  transition: background var(--transition), color var(--transition);
}

.status-badge.offset {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.status-badge.surplus {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.status-badge.shortfall {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

/* === Footer === */
.site-footer {
  text-align: center;
  padding: 20px 32px 28px;
  font-size: 12px;
  color: var(--text-faint);
}

.site-footer p {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.footer-logo {
  height: 14px;
  width: auto;
  vertical-align: middle;
  opacity: 0.6;
}

/* === Responsive === */
@media (max-width: 900px) {
  .top-row {
    grid-template-columns: 1fr;
  }

  .comparison-columns {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 20px 16px 32px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  .panel {
    padding: 22px 18px;
  }

  .panel-subtitle {
    padding-left: 0;
  }

  .savings-banner {
    flex-direction: column;
    text-align: center;
    gap: 4px;
  }

  .rate-row-static {
    flex-direction: column;
    gap: 2px;
  }
}

@media (max-width: 480px) {
  .header-wordmark {
    font-size: 13px;
  }

  .share-btn-text {
    display: none;
  }

  .share-btn {
    padding: 7px 10px;
  }
}

/* === Print === */
@media print {
  body {
    background: white;
  }

  .site-header,
  .site-footer {
    display: none;
  }

  input[type="range"] {
    display: none;
  }

  .panel {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }

  .comparison-col {
    border: 1px solid #ddd;
  }

  .savings-banner {
    border: 2px solid currentColor;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
}