/* Base WCAG 2.1/2.2 AA Accessible Stylesheet */
:root {
  --bg: #ffffff;
  --surface: #f4f6f8;
  --text: #111827;
  --muted: #374151;
  --primary: #0b4f6c;
  --primary-hover: #083a50;
  --primary-text: #ffffff;
  --focus-ring: #d97706;
  --border: #1f2937;
  --radius: 0.375rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
}

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

/* Skip Link - Visible immediately on Tab */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary);
  color: var(--primary-text);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 9999;
}

.skip-link:focus {
  top: 1rem;
  outline: 4px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Universal High-Contrast Focus Indicator */
:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.ettba-container {
  width: min(100% - 2rem, 68rem);
  margin-inline: auto;
}

/* Showcase Header & Footer */
.ettba-site-header {
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  padding: 1.25rem 0;
}

.ettba-header-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.ettba-brand {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
}

.ettba-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.ettba-nav-list a {
  color: var(--primary);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.25em;
}

/* Showcase Demo Switcher Bar */
.ettba-demo-bar {
  background: #111827;
  color: #ffffff;
  padding: 0.75rem 0;
  border-bottom: 3px solid var(--focus-ring);
}

.ettba-demo-bar-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.ettba-back-link {
  color: #ffffff;
  font-weight: 700;
  text-decoration: underline;
}

.ettba-demo-badge {
  font-weight: 700;
  color: #fcd34d;
}

.ettba-view-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.ettba-toggle-btn {
  background: #374151;
  color: #ffffff;
  border: 2px solid #9ca3af;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius);
  cursor: pointer;
}

.ettba-toggle-btn.is-active {
  background: #ffffff;
  color: #111827;
  border-color: #ffffff;
}

/* Buttons & Cards */
.ettba-btn {
  display: inline-block;
  background: var(--primary);
  color: var(--primary-text);
  border: 2px solid var(--primary);
  padding: 0.75rem 1.35rem;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  cursor: pointer;
}

.ettba-btn:hover {
  background: var(--primary-hover);
}

.ettba-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
  gap: 1.5rem;
  margin-block: 2rem;
}

.ettba-card {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.ettba-card h3 {
  margin-top: 0;
}

/* Forms */
.ettba-field {
  margin-bottom: 1.25rem;
}

.ettba-field label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.ettba-field input,
.ettba-field select,
.ettba-field textarea {
  width: 100%;
  padding: 0.75rem;
  font-size: 1.05rem;
  color: var(--text);
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
}

/* View Panels */
[hidden] {
  display: none !important;
}

.ettba-site-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  background: var(--surface);
  border-top: 2px solid var(--border);
}