:root {
  color-scheme: light;
  --color-canvas: #f8f7f4;
  --color-surface: #ffffff;
  --color-text-primary: #20231f;
  --color-text-secondary: #5d625b;
  --color-border-subtle: #d8dcd5;
  --color-action-primary: #245b45;
  --color-action-primary-text: #ffffff;
  --color-focus: #1f6feb;
  --font-family-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --radius-card: 1.25rem;
  --radius-control: 0.75rem;
  --shadow-card: 0 1rem 3rem rgb(32 35 31 / 10%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100vh;
  background: var(--color-canvas);
  color: var(--color-text-primary);
  font-family: var(--font-family-body);
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -4rem;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  color: var(--color-text-primary);
  z-index: 2;
}

.skip-link:focus { top: var(--space-3); }

main {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: var(--space-3);
}

.invite-card {
  width: min(100%, 34rem);
  padding: clamp(var(--space-4), 6vw, 3rem);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.eyebrow {
  margin: 0 0 var(--space-1);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 { margin: 0 0 var(--space-2); font-size: clamp(1.75rem, 7vw, 2.5rem); line-height: 1.15; }
p { margin: 0; }
.detail { margin-top: var(--space-3); color: var(--color-text-secondary); }

.action {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-4);
  border: 0;
  border-radius: var(--radius-control);
  background: var(--color-action-primary);
  color: var(--color-action-primary-text);
  font: inherit;
  font-weight: 700;
}

.action:focus-visible, .skip-link:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.action-secondary {
  margin-left: var(--space-2);
  border: 1px solid var(--color-action-primary);
  background: transparent;
  color: var(--color-action-primary);
}

.response-form {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.response-form label:not(.checkbox-row) {
  display: grid;
  gap: var(--space-1);
  font-weight: 700;
}

.response-form input[type='text'],
.response-form input:not([type]) {
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-control);
  color: var(--color-text-primary);
  font: inherit;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.checkbox-row input { min-width: 1.25rem; min-height: 1.25rem; }
.checkbox-row a { color: var(--color-action-primary); }
.status { margin-top: var(--space-3); color: var(--color-text-secondary); }

button:disabled { cursor: wait; opacity: 0.65; }

@media (min-width: 48rem) {
  main { padding: var(--space-5); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}