*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "Noto Sans JP", Meiryo, sans-serif;
  background: #fff9f0;
  color: #4c342a;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

:root {
  --primary: #f6b93b;
  --primary-dark: #e58e26;
  --brown: #4c342a;
  --header-bg: #7a1431;
  --surface: #ffffff;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}
.content-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}
.header-content {
  height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}
nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.35rem 0.2rem;
}
nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s;
}
nav a:hover::after,
nav a[aria-current="page"]::after {
  transform: scaleX(1);
}
nav a:hover,
nav a[aria-current="page"] {
  color: var(--primary-dark);
}

.text-center {
  text-align: center;
}
.mt-2 {
  margin-top: 0.5rem;
}
.mt-4 {
  margin-top: 1rem;
}
.my-8 {
  margin-block: 2rem;
}