:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1e232f;
  --muted: #4b5568;
  --primary: #1456d9;
  --primary-dark: #0f46b1;
  --border: #d8dce8;
  --error-bg: #ffe9ec;
  --error-text: #8f1f30;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Segoe UI, Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #d9e8ff 0%, #f6f7fb 50%, #eff2fa 100%);
  display: grid;
  place-items: center;
  padding: 1rem;
}

.container {
  width: min(720px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 10px 32px rgba(17, 24, 39, 0.08);
  padding: 2rem;
}

.home-layout {
  width: min(1120px, 100%);
}

.narrow {
  width: min(480px, 100%);
}

.site-header {
  margin-bottom: 0.8rem;
}

.brand {
  margin: 0;
  font-family: 'Trebuchet MS', 'Segoe UI Rounded', 'Segoe UI', sans-serif;
  font-size: clamp(1.45rem, 3.2vw, 2rem);
  font-weight: 800;
  letter-spacing: 0.03em;
  color: #163e86;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
}

.coming-soon-info {
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f8faff;
}

.coming-soon-info p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.coming-soon-info p:first-child {
  color: #163e86;
  font-weight: 700;
}

.coming-soon-info p + p {
  margin-top: 0.85rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}

.feature-card {
  display: block;
  min-height: 100%;
  text-decoration: none;
  color: var(--text);
  border: 3px solid #163e86;
  border-radius: 12px;
  background: #ffffff;
  padding: 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.feature-card h2 {
  margin: 0 0 0.6rem;
  font-size: 1.2rem;
  color: #163e86;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.feature-card p + p {
  margin-top: 0.75rem;
}

.feature-card:hover {
  background: #f4f8ff;
  box-shadow: 0 10px 24px rgba(20, 63, 134, 0.14);
  transform: translateY(-2px);
}

.feature-card:focus-visible {
  outline: 3px solid #1456d9;
  outline-offset: 2px;
}

.feature-card:visited {
  color: var(--text);
}

.subtitle {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.company-prompt {
  margin: 0 0 1rem;
  font-weight: 600;
  color: #163e86;
}

.subtitle + .company-prompt {
  margin-top: -1rem;
}

.company-api-link {
  margin: -0.45rem 0 1rem;
}

.company-api-link a {
  font-weight: 600;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.top-gap {
  margin-top: 1rem;
}

.button-link,
button {
  display: inline-block;
  border: 0;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.68rem 1rem;
  font-weight: 600;
  cursor: pointer;
}

.button-link:hover,
button:hover {
  background: var(--primary-dark);
}

.button-link.secondary {
  background: #e8eefc;
  color: #143266;
}

.button-link.secondary:hover {
  background: #dbe5ff;
}

.button-link.disabled,
.button-link.disabled:hover {
  background: #9ca6bb;
  color: #f7f9ff;
  cursor: not-allowed;
  pointer-events: none;
}

.form {
  display: grid;
  gap: 0.65rem;
}

label {
  font-weight: 600;
}

input {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  font: inherit;
}

input:focus {
  outline: 2px solid #9ebeff;
  border-color: #4d87fb;
}

.message {
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  margin-bottom: 1rem;
}

.error {
  background: var(--error-bg);
  color: var(--error-text);
}

.small-text {
  margin-top: 0.9rem;
  color: var(--muted);
}

.hmrc-result {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f8faff;
  padding: 0.9rem;
}

.hmrc-result p {
  margin: 0;
}

.hmrc-result p + p {
  margin-top: 0.4rem;
}

.hmrc-result pre {
  margin: 0.8rem 0 0;
  padding: 0.75rem;
  border-radius: 10px;
  background: #142544;
  color: #edf3ff;
  overflow-x: auto;
}

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

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

@media (max-width: 860px) {
  .home-layout {
    width: min(860px, 100%);
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    padding: 0.9rem;
  }
}