:root {
  --color-primary: #005fcc;
  --color-primary-hover: #0047a3;
  --color-heading: #000000;
  --color-text-secondary: #333333;
  --color-accent-purple: #6d28d9;
  --color-success: #0e7a52;
  --color-teal: #0f766e;
  --color-warning: #b45309;
  --color-danger: #b91c1c;
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-border: #767d8a;
  --color-info-bg: #eaf1fd;
  --radius-card: 12px;
  --font-family: "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
  --focus-ring: 3px solid #ffbf00;
}

:root[data-contrast="high"] {
  --color-bg: #ffffff;
  --color-border: #000000;
  --color-heading: #000000;
  --color-primary: #0033cc;
}

* { box-sizing: border-box; }

html { font-size: 112.5%; }
html[data-font-size="lg"] { font-size: 132.5%; }
html[data-font-size="xl"] { font-size: 151.9%; }

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--color-bg);
  color: #000000;
  line-height: 1.6;
}

@media (prefers-reduced-motion: reduce), (data-reduce-motion) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

a { color: #0033cc; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 1000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-heading);
  text-decoration: none;
}
.brand__accent { color: var(--color-accent-purple); }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.main-nav a { text-decoration: none; font-weight: 600; color: var(--color-heading); }
.main-nav a[aria-current="page"] { color: var(--color-primary); text-decoration: underline; }

.header-actions { display: flex; align-items: center; gap: 0.75rem; }

main { max-width: 1120px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }

h1, h2, h3 { color: var(--color-heading); line-height: 1.3; }
h1 { font-size: 1.85rem; }
h2 { font-size: 1.35rem; margin-top: 2rem; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.info-strip {
  background: var(--color-info-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font: inherit;
  font-weight: 600;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  border: 2px solid var(--color-primary);
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover, .btn:focus-visible { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
}
.btn-secondary:hover, .btn-secondary:focus-visible { background: var(--color-info-bg); }

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

fieldset { border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 1rem 1.25rem; }
legend { font-weight: 700; padding: 0 0.4rem; color: var(--color-heading); }

label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
input[type="text"], input[type="email"], input[type="password"], input[type="file"], select, textarea {
  font: inherit;
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 1rem;
}

.field-error { color: var(--color-danger); font-weight: 600; margin: -0.6rem 0 1rem; }

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.mode-card {
  border: 2px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.1rem;
  background: var(--color-surface);
  cursor: pointer;
}
.mode-card:has(input:checked) { border-color: var(--color-primary); background: var(--color-info-bg); }
.mode-card:has(input:focus-visible) { outline: var(--focus-ring); outline-offset: 2px; }
.mode-card input { margin-right: 0.5rem; }
.mode-card[aria-disabled="true"] { opacity: 0.65; }

.chip {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}
.chip--available { background: #dcf3e9; color: #0b5a3c; }
.chip--soon { background: #fbe7cf; color: #7a3f04; }
.chip--restricted { background: #f3d9d9; color: #7a1414; }

.quota-banner {
  background: var(--color-info-bg);
  border-radius: var(--radius-card);
  padding: 0.9rem 1.2rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

ol.stepper { list-style: none; display: flex; gap: 0.5rem; padding: 0; margin: 0 0 1.5rem; flex-wrap: wrap; }
ol.stepper li {
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 2px solid var(--color-border);
  font-weight: 600;
}
ol.stepper li[aria-current="step"] { border-color: var(--color-primary); background: var(--color-info-bg); color: var(--color-primary); }

.quality-list { list-style: none; padding: 0; }
.quality-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--color-border);
}
.status-text { font-weight: 700; }
.status-text--pass { color: var(--color-success); }
.status-text--check { color: var(--color-warning); }
.status-text--fail { color: var(--color-danger); }

.progress-track {
  background: var(--color-border);
  border-radius: 999px;
  height: 14px;
  overflow: hidden;
  margin: 1rem 0;
}
.progress-fill { background: var(--color-primary); height: 100%; }

.status-line {
  display: flex;
  align-items: center;
  margin: 0.75rem 0;
  min-height: 1.4em;
  font-weight: 600;
  color: var(--color-heading);
}
.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  margin-right: 0.6rem;
  flex-shrink: 0;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.spinner[hidden] { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

.result-section { margin-bottom: 1.75rem; }
.kv-table { width: 100%; border-collapse: collapse; }
.kv-table th, .kv-table td { text-align: left; padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--color-border); vertical-align: top; }
.kv-table th { width: 30%; color: var(--color-heading); }

.error-page .card { border-color: var(--color-danger); }

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 3rem;
  padding: 2rem 1.25rem;
}
.footer-cols { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1.5rem; }
.footer-cols h2 { font-size: 1rem; margin-top: 0; }
.footer-cols p { color: var(--color-text-secondary); }
.footer-cols ul { list-style: none; padding: 0; margin: 0; }
.footer-cols li { margin-bottom: 0.4rem; }

.a11y-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-teal);
  color: #fff;
  border: none;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  z-index: 200;
}
.a11y-panel {
  position: fixed;
  right: 1.25rem;
  bottom: 5.5rem;
  width: min(280px, 90vw);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1rem;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}
.a11y-panel[hidden] { display: none; }
.a11y-panel .btn-secondary { width: 100%; justify-content: center; margin-bottom: 0.5rem; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1.25rem; border-bottom: 2px solid var(--color-border); }
.tabs a {
  padding: 0.6rem 1.1rem;
  text-decoration: none;
  font-weight: 700;
  color: var(--color-heading);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}
.tabs a[aria-current="page"] { color: var(--color-primary); border-color: var(--color-primary); }

.two-col { display: grid; grid-template-columns: 2fr 1fr; gap: 1.5rem; }
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } }

.sidebar-panel { margin-bottom: 1.25rem; }
.sidebar-panel h2 { margin-top: 0; font-size: 1rem; }

.copy-feedback { font-weight: 700; color: var(--color-success); }