* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f6fb;
  color: #1f2937;
  font-size: 16px;
}

.page {
  max-width: 1250px;
  margin: 0 auto;
  padding: 1.25rem;
}

.sticky-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #f4f6fb;
  padding: 0.25rem 0 1rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 10px 18px -18px rgba(15, 23, 42, 0.45);
}

h1 {
  margin: 0 0 1rem;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 0;
}

.filter-section {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.filter-heading {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: #1f2937;
}

.filter-description {
  margin: 0;
  font-size: 1rem;
  color: #475569;
  line-height: 1.5;
}

.filter-inputs {
  display: flex;
  align-items: flex-end;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.help-toggle {
  padding: 0.5rem 0.9rem;
  border: 2px solid #475569;
  border-radius: 6px;
  background: #fff;
  color: #1f2937;
  font-size: 1rem;
  font-weight: 700;
  min-height: 44px;
  cursor: pointer;
}

.help-toggle:focus {
  outline: 3px solid #3b82f6;
  outline-offset: 2px;
}

.help-toggle:hover {
  background: #f8fafc;
}

.action-buttons-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid #cbd5e1;
}

.action-buttons-description {
  margin: 0 0 1rem;
  font-size: 1rem;
  color: #475569;
  line-height: 1.5;
}

.action-buttons {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.data-link {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  background: #fff;
  color: #1f2937;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  font-size: 1rem;
  border: 2px solid #1f2937;
  cursor: pointer;
  min-height: 44px;
  line-height: 1.2;
}

.data-link:hover {
  background: #2563eb;
}

.data-link:focus {
  outline: 3px solid #0284c7;
  outline-offset: 2px;
}

.help-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: 10px;
}

.help-panel h2 {
  margin: 0 0 0.75rem;
}

.help-panel p {
  margin: 0 0 0.9rem;
  line-height: 1.6;
}

.help-panel p:last-child {
  margin-bottom: 0;
}

label {
  font-weight: 700;
  font-size: 1.1rem;
}

select {
  padding: 0.7rem 2.2rem 0.7rem 0.9rem;
  border: 2px solid #475569;
  border-radius: 6px;
  background-color: #fff;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 6.5L8 11l5-4.5' fill='none' stroke='%231f2937' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 14px 14px;
  font-size: 1.1rem;
  min-height: 44px;
  min-width: 180px;
  cursor: pointer;
  color: #1f2937;
}

select:focus {
  outline: 3px solid #3b82f6;
  outline-offset: 2px;
}

.chart-card {
  background: #fff;
  border: 2px solid #cbd5e1;
  border-radius: 10px;
  padding: 1rem;
}

.viz-layout {
  display: grid;
  grid-template-columns: minmax(0, 2.5fr) minmax(400px, 1.4fr);
  gap: 1rem;
  align-items: start;
}

.table-card {
  background: #fff;
  border: 2px solid #cbd5e1;
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  height: auto;
  min-height: unset;
}

.table-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

.table-help {
  margin: 0 0 0.8rem;
  font-size: 1rem;
  color: #334155;
  line-height: 1.5;
}

.table-instructions {
  background: #dbeafe;
  border-left: 4px solid #0284c7;
  padding: 0.8rem 1rem;
  margin: 0 0 1rem;
  font-size: 1rem;
  color: #0c4a6e;
  border-radius: 4px;
  line-height: 1.5;
}

.chart-instructions {
  background: #dcfce7;
  border-left: 4px solid #16a34a;
  padding: 0.8rem 1rem;
  margin: 0 0 1rem;
  font-size: 1rem;
  color: #166534;
  border-radius: 4px;
  line-height: 1.5;
}

.mini-chart-wrap {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 2px solid #cbd5e1;
}

.mini-chart-wrap h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

#diveCompare svg {
  width: 100%;
  height: auto;
  display: block;
}

.mini-placeholder {
  margin: 0.5rem 0 0.3rem;
  font-size: 1rem;
  color: #475569;
  padding: 1rem;
  background: #f1f5f9;
  border-radius: 4px;
}

#rankTable {
  width: 100%;
  overflow-y: auto;
  flex: 1;
  margin-bottom: 1rem;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
}

#rankTable table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

#rankTable th,
#rankTable td {
  text-align: left;
  padding: 0.8rem;
  border-bottom: 1px solid #cbd5e1;
  font-weight: 500;
}

#rankTable th {
  background: #f8fafc;
  font-weight: 700;
  color: #1f2937;
  border-bottom: 2px solid #cbd5e1;
}

#rankTable tbody tr {
  cursor: pointer;
  min-height: 44px;
}

#rankTable tbody tr:hover {
  background: #eff6ff;
  border-left: 4px solid #3b82f6;
}

#rankTable tbody tr:focus {
  outline: 3px solid #3b82f6;
  outline-offset: -2px;
  background: #dbeafe;
}

#rankTable tbody tr.active {
  background: #dbeafe;
  border-left: 4px solid #0284c7;
}

#rankTable .rank-name {
  font-weight: 600;
  color: #1f2937;
}

#chart svg {
  width: 100%;
  height: auto;
  display: block;
}

.chart-guide {
  margin: 1rem 0;
  padding: 0.8rem 1rem;
  background: #fef08a;
  border-left: 4px solid #ca8a04;
  border-radius: 4px;
}

.chart-guide-text {
  margin: 0;
  font-size: 1rem;
  color: #713f12;
  line-height: 1.5;
}

.axis-label {
  font-size: 1rem;
  fill: #1f2937;
  font-weight: 700;
}

.line-path {
  fill: none;
  stroke-width: 2.5;
  opacity: 0.9;
  cursor: pointer;
}

.line-path:hover {
  stroke-width: 4;
  opacity: 1;
}

.line-path.active {
  stroke-width: 4;
  opacity: 1;
}

.line-path.faded {
  opacity: 0.2;
  stroke-width: 2.5;
}

.line-dot {
  stroke: #fff;
  stroke-width: 1.5;
  cursor: pointer;
}

.line-dot:focus {
  stroke: #0284c7;
  stroke-width: 3;
}

.tooltip {
  position: fixed;
  z-index: 10;
  pointer-events: none;
  background: #111827;
  color: #f9fafb;
  border-radius: 8px;
  border: 2px solid #374151;
  padding: 0.8rem;
  font-size: 1rem;
  line-height: 1.5;
  max-width: 300px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.tooltip.hidden {
  display: none;
}

#data-link-section {
  display: flex;
  align-items: center;
}

#data-link-section a {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.9rem;
  background: #1d4ed8;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  font-size: 1rem;
  border: 2px solid #1e40af;
  cursor: pointer;
  min-height: 44px;
  line-height: 1.2;
}

#data-link-section a:hover {
  background: #2563eb;
}

#data-link-section a:focus {
  outline: 3px solid #0284c7;
  outline-offset: 2px;
}

.data-table-modal {
  display: none;
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
}

.data-table-modal.show {
  display: block;
}

.modal-content {
  background-color: #fff;
  margin: 2rem auto;
  padding: 2rem;
  border: 2px solid #cbd5e1;
  border-radius: 10px;
  width: 90%;
  max-width: 1000px;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-close {
  color: #475569;
  float: right;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
  margin: -1rem -1rem 1rem 0;
}

.modal-close:hover {
  color: #1f2937;
}

.data-table-modal table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
  margin-top: 1rem;
}

.data-table-modal th {
  background: #f8fafc;
  color: #1f2937;
  font-weight: 700;
  padding: 0.8rem;
  text-align: left;
  border: 1px solid #cbd5e1;
}

.data-table-modal td {
  padding: 0.6rem;
  border: 1px solid #cbd5e1;
}

.data-table-modal tr:hover {
  background: #eff6ff;
}

@media (max-width: 1050px) {
  .viz-layout {
    grid-template-columns: 1fr;
  }
  
  .page {
    padding: 1rem;
  }
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }
  
  .controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  select {
    width: 100%;
  }
  
  #rankTable table {
    font-size: 1rem;
  }
  
  #rankTable th,
  #rankTable td {
    padding: 0.6rem;
  }
}

/* High contrast mode support */
@media (prefers-contrast: more) {
  body {
    color: #000;
  }
  
  select {
    border-width: 3px;
  }
  
  #rankTable tbody tr:hover,
  #rankTable tbody tr.active {
    border-width: 5px;
  }
}