:root {
  --font-family: 'Inter', sans-serif;
  --bg-color: #f8fafc;
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #eef2ff 50%, #f8fafc 100%);
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 0, 0, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-indigo: #4f46e5;
  --accent-teal: #0f766e;
  --table-border: rgba(0, 0, 0, 0.08);
  --table-row-hover: rgba(0, 0, 0, 0.03);
  --positive-emerald: #059669;
  --negative-rose: #e11d48;
  --cec-amber: #ea580c;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  background-size: cover;
  background-repeat: no-repeat;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 4rem;
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #4f46e5, #0d9488);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2rem;
}
.section-header > div:first-child .section-desc {
  margin-bottom: 0;
}
.section-header-actions {
  display: flex;
  gap: 0.5rem;
}
/* Layout */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.header {
  padding: 4rem 0 3rem;
  text-align: center;
}

.legend {
  margin-top: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 1.5rem;
  background: rgba(255,255,255,0.7);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  font-size: 0.875rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.swatch.current {
  background: var(--accent-indigo);
  box-shadow: 0 0 8px rgba(79, 70, 229, 0.4);
}

.section {
  margin-bottom: 5rem;
}

/* Table Wrapper */
.table-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  overflow-x: auto;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  white-space: nowrap;
}

.comparison-table th, 
.comparison-table td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--table-border);
}

.comparison-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(0,0,0,0.03);
}

.comparison-table tbody tr {
  transition: background-color 0.2s;
}

.comparison-table tbody tr:hover {
  background-color: var(--table-row-hover);
}

.comparison-table td {
  font-size: 0.9375rem;
}

.sticky-col {
  position: sticky;
  left: 0;
  background: #ffffff; /* pure white for overlap hiding */
  z-index: 10;
  font-weight: 500;
  box-shadow: 2px 0 5px rgba(0,0,0,0.05);
}

.sortable-row {
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  user-select: none;
}
.sortable-row:hover {
  background: #f1f5f9;
  color: var(--accent-indigo);
}
.sort-icon {
  display: inline-block;
  margin-left: 0.2rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  opacity: 0.5;
  transition: opacity 0.2s;
}
.sortable-row:hover .sort-icon {
  opacity: 1;
  color: var(--accent-indigo);
}

th.sticky-col {
  background: #f8fafc;
}

/* Table Column Provider Styling */
.col-CEBT {
  background: rgba(79, 70, 229, 0.03); /* Indigo tint */
}
.header-CEBT {
  color: var(--accent-indigo) !important;
  border-top: 3px solid var(--accent-indigo);
}

.col-PERACare {
  background: rgba(5, 150, 105, 0.03); /* Emerald tint */
}
.header-PERACare {
  color: var(--positive-emerald) !important;
  border-top: 3px solid var(--positive-emerald);
}

.col-CEC {
  background: rgba(234, 88, 12, 0.03); /* Amber tint */
}
.header-CEC {
  color: var(--cec-amber) !important;
  border-top: 3px solid var(--cec-amber);
}

.footer {
  text-align: center;
  padding-top: 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Control Section */
.controls-section {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  width: 100%;
  gap: 1rem;
  margin-bottom: 2rem;
}
.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
.control-label, .control-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 600;
}
select, input[type="number"] {
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--card-border);
  background: #ffffff;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  outline: none;
}
.segmented-control {
  display: flex;
  background: rgba(0,0,0,0.03);
  border-radius: 6px;
  border: 1px solid var(--card-border);
  overflow: hidden;
}
.seg-btn {
  flex: 1;
  padding: 0.45rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  border-right: 1px solid var(--card-border);
}
.seg-btn:last-child {
  border-right: none;
}
.seg-btn:hover {
  background: rgba(0,0,0,0.02);
}
.seg-btn.active {
  background: #ffffff;
  color: var(--accent-indigo);
  font-weight: 600;
}
.help-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  max-width: 290px;
  line-height: 1.3;
}
.btn-primary {
  padding: 0.5rem 1.5rem;
  background: var(--accent-indigo);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-primary:hover {
  background: #4338ca;
}
.btn-primary.active {
  background: var(--positive-emerald);
}
.btn-primary.active:hover {
  background: #047857;
}
.btn-secondary {
  padding: 0.5rem 1.5rem;
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover {
  background: #f8fafc;
  border-color: var(--text-secondary);
}
.btn-secondary.active {
  background: var(--accent-indigo);
  border-color: var(--accent-indigo);
  color: #fff;
}
.btn-secondary.active:hover {
  background: #4338ca;
}
.btn-text {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-text:hover {
  background: rgba(0,0,0,0.04);
  color: var(--accent-indigo);
  border-color: rgba(0,0,0,0.1);
}

.checkbox-group {
  display: flex;
  gap: 1rem;
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-primary);
}
.checkbox-label input {
  accent-color: var(--accent-teal);
  cursor: pointer;
}

/* Difference Badges */
.diff-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  font-weight: 600;
  white-space: nowrap;
}
.diff-positive {
  background: rgba(5, 150, 105, 0.1);
  color: var(--positive-emerald);
}
.diff-negative {
  background: rgba(225, 29, 72, 0.1);
  color: var(--negative-rose);
}
.diff-neutral {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-secondary);
}

/* Plan Highlights */
.plan-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.badge-current {
  background: rgba(79, 70, 229, 0.1);
  color: var(--accent-indigo);
  border: 1px solid rgba(79, 70, 229, 0.2);
}
.badge-rec {
  background: rgba(15, 118, 110, 0.1);
  color: var(--accent-teal);
  border: 1px solid rgba(15, 118, 110, 0.2);
}
.row-highlight-current, .col-highlight-current {
  background-color: rgba(79, 70, 229, 0.06) !important;
}
.premium-table tbody tr.row-highlight-current:hover {
  background-color: rgba(79, 70, 229, 0.1) !important;
}
.row-highlight-rec, .col-highlight-rec {
  background-color: rgba(15, 118, 110, 0.06) !important;
}
.premium-table tbody tr.row-highlight-rec:hover {
  background-color: rgba(15, 118, 110, 0.1) !important;
}

/* Heatmap Texts */
.val-better {
  color: var(--positive-emerald) !important;
  font-weight: 600;
}
.val-worse {
  color: var(--negative-rose) !important;
  font-weight: 600;
}
.val-neutral {
  color: var(--text-primary);
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  .app-container {
    padding: 0 1rem;
  }
  .comparison-table th,
  .comparison-table td {
    padding: 0.75rem 1rem;
  }
}

/* Premium Overview Tables */
.premium-tables-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.premium-carrier-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--card-border);
}

.premium-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  table-layout: fixed;
}

.premium-table thead th {
  padding: 0.4rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--card-border);
}

.premium-table thead th:first-child { width: 30%; }
.premium-table thead th:not(:first-child) { width: 17.5%; }

.pt-col-right {
  text-align: right;
}

.premium-table tbody tr {
  border-bottom: 1px solid var(--card-border);
  cursor: pointer;
  transition: background 0.15s;
}

.premium-table tbody tr:last-child {
  border-bottom: none;
}

.premium-table tbody tr:hover {
  background: var(--table-row-hover);
}

.premium-table tbody tr.pt-baseline {
  background: rgba(79, 70, 229, 0.06);
  box-shadow: inset 3px 0 0 var(--accent-indigo);
}

.premium-table td {
  padding: 0.55rem 0.75rem;
  color: var(--text-primary);
  vertical-align: middle;
  white-space: nowrap;
}

.pt-checkbox {
  margin-right: 0.5rem;
  accent-color: var(--accent-indigo);
  cursor: pointer;
  vertical-align: middle;
}

.pt-plan-name {
  font-weight: 500;
}

/* Carrier Feature Comparison */
.cf-chevron {
  display: inline-block;
  font-size: 0.65rem;
  color: var(--text-secondary);
  transition: transform 0.2s;
  margin-right: 0.35rem;
}

.comparison-table tbody tr.cf-open .cf-chevron {
  transform: rotate(180deg);
}

.cf-headline {
  font-weight: 500;
  color: var(--text-primary);
}

.comparison-table tbody tr:hover .cf-headline {
  color: var(--accent-indigo);
}

.cf-detail {
  display: none;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.4rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--table-border);
  white-space: normal;
  word-wrap: break-word;
}

#carrier-features-container .comparison-table {
  table-layout: fixed;
}

#carrier-features-container .comparison-table th:first-child,
#carrier-features-container .comparison-table td:first-child {
  width: 22%;
}

#carrier-features-container .comparison-table tr.cf-open td {
  white-space: normal;
}

.comparison-table tbody tr.cf-open .cf-detail {
  display: block;
}

.cf-tag {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  margin-top: 0.35rem;
}

.cf-tag-CEBT     { background: rgba(79, 70, 229, 0.1); color: var(--accent-indigo); }
.cf-tag-PERACare { background: rgba(5, 150, 105, 0.1); color: var(--positive-emerald); }
.cf-tag-CEC      { background: rgba(234, 88, 12, 0.1); color: var(--cec-amber); }

/* Help Button in Header */
.header-content {
  position: relative;
}

.help-btn {
  position: absolute;
  top: 0;
  right: 0;
  font-size: 0.875rem;
  padding: 0.4rem 1rem;
}

/* Help Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.open {
  display: flex;
}

.modal-panel {
  background: #ffffff; /* solid white to prevent content bleed-through on the backdrop */
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--table-border);
  flex-shrink: 0;
}

.modal-header h2 {
  margin-bottom: 0;
  font-size: 1.25rem;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem 2rem 2rem;
  overflow-y: auto;
  flex: 1;
}

.modal-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.35rem;
  color: var(--text-primary);
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.modal-body ul {
  padding-left: 1.25rem;
  margin: 0.25rem 0 0.5rem;
}

.modal-body li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.35rem;
}

.modal-body strong {
  color: var(--text-primary);
  font-weight: 600;
}