:root {
  --forest: #164734;
  --lake: #287f83;
  --sand: #f3efe4;
  --ink: #1d2924;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--ink);
  background: var(--sand);
}

header {
  padding: 5rem 1.5rem;
  text-align: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--forest), var(--lake));
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.1;
}

header p {
  margin: 1rem 0 0;
  font-size: 1.2rem;
}

main {
  width: min(90%, 900px);
  margin: 2rem auto;
}

section {
  padding: 2rem;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 10%);
}

section h2 {
  margin-top: 0;
  color: var(--forest);
}
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 5%;
  background: var(--white);
  box-shadow: 0 2px 10px rgb(0 0 0 / 8%);
}

.site-nav a {
  color: var(--forest);
  text-decoration: none;
}

.site-name {
  font-size: 1.15rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}

.nav-links a {
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--lake);
  border-bottom-color: var(--lake);
}

@media (max-width: 600px) {
  .site-nav {
    flex-direction: column;
  }

  .nav-links {
    justify-content: center;
  }
}
.nav-links a[aria-current="page"] {
  color: var(--lake);
  font-weight: 700;
  border-bottom-color: var(--lake);
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.form-grid label {
  display: grid;
  gap: 0.4rem;
  font-weight: 700;
  color: var(--forest);
}

input,
select {
  width: 100%;
  padding: 0.75rem;
  font: inherit;
  color: var(--ink);
  background: var(--white);
  border: 1px solid #aebbb5;
  border-radius: 6px;
}

input:focus,
select:focus {
  outline: 3px solid rgb(40 127 131 / 25%);
  border-color: var(--lake);
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin: 1.5rem 0;
}

.checkbox-field input {
  width: auto;
  margin-top: 0.3rem;
}

button {
  padding: 0.8rem 1.25rem;
  font: inherit;
  font-weight: 700;
  color: var(--white);
  background: var(--forest);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

button:hover,
button:focus {
  background: var(--lake);
}

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

#registration-status {
  min-height: 1.5rem;
  font-weight: 700;
}