:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #4b5563;
  --color-primary: #1d4ed8;
  --color-primary-contrast: #ffffff;
  --color-border: #d1d5db;
  --color-surface: #f3f4f6;
  --color-error: #b91c1c;
  --color-success: #15803d;
  --focus-ring: 3px solid #1d4ed8;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.6;
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
}

a {
  color: var(--color-primary);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  padding: 0.75rem 1rem;
  z-index: 1000;
  border-radius: 0 0 0.5rem 0;
}

.skip-link:focus {
  left: 0;
}

.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;
}

.container {
  width: 100%;
  max-width: 40rem;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

header.site-header {
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.site-logo {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-text);
}

main {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

h1 {
  font-size: clamp(1.75rem, 1.4rem + 1.8vw, 2.5rem);
  margin-bottom: 0.5rem;
}

.lede {
  color: var(--color-muted);
  max-width: 40ch;
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.2rem);
}

.benefits {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 2.5rem;
  display: grid;
  gap: 0.6rem;
}

.benefits li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  color: var(--color-muted);
}

.benefits li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
}

.download-form {
  display: grid;
  gap: 1.25rem;
  padding: 1.75rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface);
}

.form-field {
  display: grid;
  gap: 0.35rem;
}

.form-field label {
  font-weight: 600;
}

.form-field input {
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
}

.form-field input[aria-invalid='true'] {
  border-color: var(--color-error);
}

.field-error {
  color: var(--color-error);
  font-size: 0.9rem;
  min-height: 1.2em;
}

.form-note {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding-inline: 1.5rem;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  border: none;
  border-radius: 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.button--large {
  min-height: 52px;
  width: 100%;
}

.form-status {
  min-height: 1.4em;
  font-weight: 600;
}

.form-status[data-state='error'] {
  color: var(--color-error);
}

/* Thank-you page */
.thanks-card {
  text-align: center;
  padding: 2.5rem 1.75rem;
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  background: var(--color-surface);
}

.thanks-icon {
  font-size: 2.5rem;
}

.next-links {
  display: grid;
  gap: 0.75rem;
  margin-top: 2rem;
}

.next-links a {
  display: block;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg);
}

.next-links a:hover {
  background: var(--color-surface);
}

footer.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 1.5rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}