:root {
  --color-bg: #ffffff;
  --color-text: #222222;
  --color-accent: #7a5c3e;
  --color-accent-light: #f5efe6;
  --color-border: #e0d8ca;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--color-accent);
  text-decoration: none;
}

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

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

nav.main-nav a:hover,
nav.main-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

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

.hero h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.hero p {
  color: #555;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  background: #fff;
}

.card h3 {
  margin-top: 0;
  color: var(--color-accent);
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.95rem;
}

.btn:hover {
  opacity: 0.9;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 480px;
}

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

input,
textarea {
  font-size: 1rem;
  padding: 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: inherit;
}

footer.site-footer {
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 1.5rem;
  color: #888;
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  nav.main-nav ul {
    gap: 1rem;
    flex-wrap: wrap;
  }
}