/* ============================================================================
   Split Test Pro — Design System
   Semantic HTML + CSS Custom Properties
   ============================================================================ */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg: #f6f6f7;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f2f3;
  --color-border: #e1e3e5;
  --color-border-hover: #c9cccf;
  --color-text: #202223;
  --color-text-secondary: #6d7175;
  --color-text-disabled: #8c9196;
  --color-link: #2c6ecb;
  --color-link-hover: #1f5199;

  /* Status colors */
  --color-success: #008060;
  --color-success-bg: #f1f8f5;
  --color-warning: #b98900;
  --color-warning-bg: #fdf8ec;
  --color-critical: #d72c0d;
  --color-critical-bg: #fdf3f0;
  --color-info: #2c6ecb;
  --color-info-bg: #f0f5fa;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI',
    Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas,
    'Liberation Mono', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.75rem;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  --border: 1px solid var(--color-border);

  /* Shadows */
  --shadow-sm: 0 1px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 1px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 2px 16px rgba(0, 0, 0, 0.1);

  /* Layout */
  --page-max-width: 1200px;
  --page-padding: var(--space-6);
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 600;
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }

p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

small {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

code, pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
}

/* --------------------------------------------------------------------------
   Page Layout
   -------------------------------------------------------------------------- */
.page {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--page-padding);
}

.page--full-width {
  max-width: none;
}

.page-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.page-header__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.page-header__back:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  text-decoration: none;
}

.page-header__title-group {
  flex: 1;
}

.page-header__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.page-header__subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-top: var(--space-1);
}

.page-header__actions {
  display: flex;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------------
   Card
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card + .card {
  margin-top: var(--space-4);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Stack Layouts
   -------------------------------------------------------------------------- */
.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.stack--tight { gap: var(--space-2); }
.stack--loose { gap: var(--space-6); }

.inline {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.inline--tight { gap: var(--space-2); }
.inline--spread { justify-content: space-between; }

/* --------------------------------------------------------------------------
   Grid
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--sidebar { grid-template-columns: 1fr 3fr; }

@media (max-width: 768px) {
  .grid--2, .grid--3, .grid--sidebar {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1;
  border: var(--border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  min-height: 2.25rem;
}

button:hover, .btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

button:disabled, .btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background: var(--color-link);
  color: white;
  border-color: var(--color-link);
}

.btn--primary:hover {
  background: var(--color-link-hover);
  border-color: var(--color-link-hover);
}

.btn--critical {
  background: var(--color-critical);
  color: white;
  border-color: var(--color-critical);
}

.btn--critical:hover {
  background: #c42506;
  border-color: #c42506;
}

.btn--large {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-md);
  min-height: 2.75rem;
}

.btn--loading {
  position: relative;
  color: transparent;
}

.btn--loading::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="number"],
input[type="password"],
input[type="search"],
textarea,
select {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-link);
  box-shadow: 0 0 0 1px var(--color-link);
}

input:invalid {
  border-color: var(--color-critical);
}

fieldset {
  border: none;
  padding: 0;
}

legend {
  font-size: var(--font-size-base);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.form-group {
  margin-bottom: var(--space-4);
}

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

.radio-group, .checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.radio-group label, .checkbox-group label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 400;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Banners / Alerts
   -------------------------------------------------------------------------- */
.banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid;
  font-size: var(--font-size-base);
}

.banner--success {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
}

.banner--warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.banner--critical {
  background: var(--color-critical-bg);
  border-color: var(--color-critical);
  color: var(--color-critical);
}

.banner--info {
  background: var(--color-info-bg);
  border-color: var(--color-info);
  color: var(--color-info);
}

.banner__content {
  flex: 1;
}

.banner__content p {
  color: inherit;
}

.banner__actions {
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   Badge
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  line-height: 1;
  text-transform: capitalize;
}

.badge--created {
  background: var(--color-info-bg);
  color: var(--color-info);
}

.badge--started {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge--paused {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge--completed {
  background: #e4e5e7;
  color: var(--color-text-secondary);
}

.badge--archived {
  background: #e4e5e7;
  color: var(--color-text-disabled);
}

/* --------------------------------------------------------------------------
   Tables / Resource Lists
   -------------------------------------------------------------------------- */
.resource-list {
  list-style: none;
  border: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
}

.resource-list__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border-bottom: var(--border);
  font-size: var(--font-size-sm);
}

.resource-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border);
  transition: background 0.1s;
}

.resource-item:last-child {
  border-bottom: none;
}

.resource-item:hover {
  background: var(--color-surface-hover);
}

.resource-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
}

.resource-item a:hover {
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: var(--border);
  margin-bottom: var(--space-4);
}

.tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.tab:hover {
  color: var(--color-text);
}

.tab[aria-selected="true"],
.tab--active {
  color: var(--color-text);
  border-bottom-color: var(--color-link);
}

.tab-panel {
  display: none;
}

.tab-panel[aria-hidden="false"],
.tab-panel--active {
  display: block;
}

/* --------------------------------------------------------------------------
   Sub-tabs (used within Configuration panel)
   -------------------------------------------------------------------------- */
.subtabs {
  display: flex;
  gap: 0;
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.subtab {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: none;
  border-right: var(--border);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-align: center;
}

.subtab:last-child {
  border-right: none;
}

.subtab:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.subtab[aria-selected="true"],
.subtab--active {
  color: var(--color-link);
  background: var(--color-info-bg);
  border-bottom-color: var(--color-link);
  font-weight: 600;
}

.subtab-panel {
  display: none;
}

.subtab-panel--active {
  display: block;
}

/* --------------------------------------------------------------------------
   Callout Card
   -------------------------------------------------------------------------- */
.callout {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.callout + .callout {
  margin-top: var(--space-4);
}

.callout__illustration {
  width: 100px;
  height: 100px;
  flex-shrink: 0;
}

.callout__illustration img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.callout__content {
  flex: 1;
}

.callout__content h3 {
  margin-bottom: var(--space-2);
}

.callout__actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* --------------------------------------------------------------------------
   Empty State
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-8);
}

.empty-state img {
  max-width: 200px;
  margin-bottom: var(--space-6);
}

.empty-state h3 {
  margin-bottom: var(--space-3);
}

.empty-state p {
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Skeleton Loading
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, #e4e5e7 25%, #f0f1f2 50%, #e4e5e7 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

.skeleton--text {
  height: 0.875rem;
  margin-bottom: var(--space-2);
}

.skeleton--text:last-child {
  width: 60%;
}

.skeleton--heading {
  height: 1.5rem;
  width: 40%;
  margin-bottom: var(--space-4);
}

.skeleton--card {
  height: 8rem;
  border-radius: var(--radius-lg);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.page-footer {
  text-align: center;
  padding: var(--space-8) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Modal / Dialog
   -------------------------------------------------------------------------- */
dialog {
  border: none;
  border-radius: var(--radius-lg);
  padding: 0;
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 90vw;
  margin: auto;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: var(--border);
}

.dialog__body {
  padding: var(--space-6);
}

.dialog__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-top: var(--border);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }

.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--color-success); }
.text-critical { color: var(--color-critical); }
.text-warning { color: var(--color-warning); }

.font-bold { font-weight: 600; }
.font-mono { font-family: var(--font-mono); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* --------------------------------------------------------------------------
   Spinner
   -------------------------------------------------------------------------- */
.spinner {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-link);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.spinner--small {
  width: 0.875rem;
  height: 0.875rem;
}

/* --------------------------------------------------------------------------
   Accordion (Statistical Analysis per-measurement)
   -------------------------------------------------------------------------- */
.accordion {
  background: var(--color-surface);
  border: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.accordion + .accordion {
  margin-top: 0;
}

.accordion__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-base);
  font-weight: 500;
  list-style: none;
  transition: background 0.15s;
}

.accordion__header::-webkit-details-marker {
  display: none;
}

.accordion__header:hover {
  background: var(--color-surface-hover);
}

.accordion__chevron {
  font-size: 0.65rem;
  color: var(--color-text-secondary);
  transition: transform 0.2s;
  flex-shrink: 0;
  width: 1rem;
  text-align: center;
}

.accordion[open] > .accordion__header .accordion__chevron {
  transform: rotate(90deg);
}

.accordion__title {
  font-weight: 600;
  min-width: 160px;
}

.accordion__overview {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.accordion__body {
  padding: 0 var(--space-4) var(--space-4);
  border-top: var(--border);
}

/* --------------------------------------------------------------------------
   Violin Chart / Cell-with-Chart (Statistical Analysis)
   -------------------------------------------------------------------------- */
.cell-with-chart {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 280px;
}

.cell-with-chart__data {
  display: flex;
  gap: var(--space-4);
  margin: 0;
  font-size: var(--font-size-sm);
}

.cell-with-chart__data span {
  display: inline-flex;
  gap: var(--space-1);
}

.cell-with-chart__data dt {
  color: var(--color-text-secondary);
  font-weight: 400;
  font-size: var(--font-size-xs);
}

.cell-with-chart__data dd {
  margin: 0;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.violin-svg {
  display: block;
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   Crisp Chat — hide inside Shopify App Bridge modals
   -------------------------------------------------------------------------- */
ui-modal .crisp-client,
ui-modal #crisp-chatbox,
iframe .crisp-client,
ui-modal [data-crisp-namespace] {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
}