:root {
  --color-bg: #f0f4f8;
  --color-surface: #fff;
  --color-text: #1e293b;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-accent: #003b83;
  --color-accent-hover: #002a5c;
  --color-danger: #dc2626;
  --font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-serif: "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  --max-width: 1080px;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  --header-nav-height: 3.5rem;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

a { color: var(--color-accent); }
a:hover { color: var(--color-accent-hover); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

img { max-width: 100%; height: auto; display: block; }

.site-header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-accent);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header__inner,
.site-main,
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.375rem;
  padding-bottom: 0.375rem;
  min-height: var(--header-nav-height);
}

.site-header__end {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  line-height: 0;
}

.site-logo img {
  display: block;
  width: 10.5rem;
  height: auto;
  max-width: min(10.5rem, 52vw);
}

.site-logo:hover img {
  opacity: 0.85;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  font-size: 0.9375rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-muted);
  padding: 0.25rem 0;
}

.site-nav a:hover { color: var(--color-accent); }

.site-nav__link--with-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  line-height: 1;
}

.site-nav__link--with-icon svg {
  flex-shrink: 0;
  width: 1.125em;
  height: 1.125em;
}

.site-nav__cart-icon {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
}

.site-nav__cart-badge {
  position: absolute;
  top: -0.6em;
  right: -0.75em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25em;
  height: 1.25em;
  padding: 0 0.28em;
  border-radius: 999px;
  background: var(--color-danger);
  color: #fff;
  font-size: 0.65em;
  font-weight: 700;
  line-height: 1;
  text-align: center;
  box-sizing: border-box;
  pointer-events: none;
}

.site-nav a:hover .site-nav__cart-badge,
.site-header__cart:hover .site-nav__cart-badge {
  color: #fff;
}

.site-header__cart {
  display: none;
}

.site-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
}

.site-nav-toggle span {
  display: block;
  width: 1.25rem;
  height: 2px;
  margin: 0 auto;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 20;
}

.site-nav-mask.is-open { display: block; }

.site-nav--drawer {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: min(280px, 85vw);
  height: 100%;
  flex-direction: column;
  gap: 0;
  padding: 4rem 1.25rem 1.5rem;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: -4px 0 16px rgba(15, 23, 42, 0.12);
  z-index: 30;
  overflow-y: auto;
}

.site-nav--drawer.is-open { display: flex; }

.site-nav--drawer a {
  display: block;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 1rem;
}

.site-nav--drawer .site-nav__link--with-icon {
  display: flex;
}

.site-nav--drawer a:hover {
  color: var(--color-accent);
}

.site-main {
  padding-top: 2rem;
  padding-bottom: 3rem;
  min-height: calc(100vh - 8rem);
}

.site-footer {
  background: var(--color-accent);
  color: #e8eef4;
  padding: 2rem 0 2.5rem;
  font-size: 0.875rem;
}

.site-footer p { margin: 0.25rem 0; }

.site-footer a {
  color: #fff;
}

.site-footer a:hover {
  color: #cbd5e1;
}

.site-footer strong {
  color: #fff;
  font-size: 1rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
}

.site-footer__links a {
  color: #cbd5e1;
  text-decoration: none;
}

.site-footer__links a:hover {
  color: #fff;
  text-decoration: underline;
}

@media (max-width: 768px) {
  .site-nav--desktop { display: none; }

  .site-nav-toggle { display: flex; }

  .site-header__cart {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: var(--radius);
    background: var(--color-accent);
    color: #fff;
    text-decoration: none;
    flex-shrink: 0;
  }

  .site-header__cart:hover,
  .site-header__cart:focus-visible {
    background: var(--color-accent-hover);
    color: #fff;
  }

  .site-header__cart svg {
    width: 1.35rem;
    height: 1.35rem;
  }

  .site-header__cart .site-nav__cart-icon {
    position: static;
  }

  .site-header__cart .site-nav__cart-badge {
    top: -0.35rem;
    right: -0.35rem;
    min-width: 1.2rem;
    height: 1.2rem;
    font-size: 0.65rem;
    border: 2px solid var(--color-surface);
  }
}

@media (min-width: 769px) {
  .site-nav-mask,
  .site-nav--drawer { display: none !important; }
}