:root {
  --color-primary: #0f766e;
  --color-primary-dark: #0b5c56;
  --color-bg: #f7faf9;
  --color-surface: #ffffff;
  --color-border: #d9e2e0;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-error-bg: #fef2f2;
  --color-error-text: #991b1b;
  --color-success-bg: #f0fdf4;
  --color-success-text: #166534;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

header.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

nav#site-nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  text-decoration: none;
}

nav .nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

nav .nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}

nav .nav-links a:hover {
  color: var(--color-primary);
}

nav .button-link {
  background: var(--color-primary);
  color: #fff;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
}

nav .button-link:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

nav .nav-user {
  color: var(--color-muted);
  font-size: 0.9rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero {
  text-align: center;
  padding: 3rem 1rem;
}

.hero h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary-dark);
}

.hero p {
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.card h3 {
  font-size: 1.05rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

input,
select,
textarea {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 0.65rem 1.1rem;
  font-size: 0.95rem;
  font-weight: 600;
  background: var(--color-primary);
  color: #fff;
}

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

button.secondary {
  background: transparent;
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

button.secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

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

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

[hidden] {
  display: none !important;
}

.field-help {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.offer-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.offer-list li {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 640px) {
  nav#site-nav {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }

  .hero-actions {
    flex-direction: column;
  }

  .two-column {
    grid-template-columns: 1fr;
  }
}