:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #1f2320;
  --color-muted: #6b6f6d;
  --color-primary: #2f5d4f;
  --color-primary-dark: #1e3d33;
  --color-border: #e3e1dc;
  --color-danger: #b3261e;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

header a {
  color: var(--color-primary-dark);
  text-decoration: none;
  font-weight: 600;
}

header a:hover {
  text-decoration: underline;
}

.brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
}

nav[data-nav] {
  display: flex;
  align-items: center;
  gap: 1rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

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

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

.card h3 {
  margin: 0 0 0.25rem;
}

.card .meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
}

.button {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  border: none;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  font-size: 1rem;
}

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

.button:disabled {
  background: var(--color-border);
  color: var(--color-muted);
  cursor: not-allowed;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  max-width: 380px;
}

label {
  font-weight: 600;
  font-size: 0.9rem;
}

input {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
}

.message {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.message.error {
  background: #fbeceb;
  color: var(--color-danger);
}

.message.info {
  background: #eef4f1;
  color: var(--color-primary-dark);
}

.empty-state {
  color: var(--color-muted);
  font-style: italic;
}

@media (max-width: 480px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
}