/*
 * 全ページ共通の基本スタイル。
 * ページ固有のスタイルは各ページ用のCSSファイルに分けて追加していく想定。
 */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Hiragino Mincho ProN", serif;
  background-color: var(--ink);
  color: var(--brass);
}

a {
  color: var(--ember);
  text-decoration: none;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  min-height: 3.5rem;
  border-bottom: 1px solid color-mix(in oklch, var(--brass) 35%, transparent);
  background-color: color-mix(in oklch, var(--emerald) 6%, var(--ink));
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brass);
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

.site-header__logo::before {
  content: '⚙\FE0E';
  color: var(--ember);
  font-size: 0.85em;
  transition: transform 0.8s ease;
}

.site-header__logo:hover {
  color: var(--ember);
}

.site-header__logo:hover::before {
  transform: rotate(180deg);
}

.site-header__nav {
  display: flex;
  align-self: stretch;
  align-items: stretch;
}

.site-header__nav a {
  display: flex;
  align-items: center;
  padding: 0 0.875rem;
  font-size: 0.8rem;
  color: color-mix(in oklch, var(--brass) 75%, var(--ink));
  border-left: 1px solid color-mix(in oklch, var(--brass) 20%, transparent);
  transition: color 0.2s, background-color 0.2s;
  letter-spacing: 0.02em;
}

.site-header__nav a:last-child {
  border-right: 1px solid color-mix(in oklch, var(--brass) 20%, transparent);
}

.site-header__nav a:hover {
  color: var(--brass);
  background-color: color-mix(in oklch, var(--brass) 8%, transparent);
}

.site-header__nav a.is-current {
  color: var(--ember);
  background-color: color-mix(in oklch, var(--ember) 12%, transparent);
  box-shadow: inset 0 -2px 0 var(--ember);
}

/* ハンバーガーメニューボタン */
.site-header__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0.375rem;
  background: none;
  border: 1px solid color-mix(in oklch, var(--brass) 30%, transparent);
  border-radius: 2px;
  cursor: pointer;
}

.site-header__menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--brass);
  transition: transform 0.3s ease, opacity 0.2s ease;
}

.site-header--open .site-header__menu-btn span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.site-header--open .site-header__menu-btn span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.site-header--open .site-header__menu-btn span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media (width <= 768px) {
  .site-header {
    flex-wrap: wrap;
    padding: 0 1rem;
    align-items: center;
  }

  .site-header__logo {
    flex: 1;
  }

  .site-header__menu-btn {
    display: flex;
  }

  .site-header__nav {
    width: 100%;
    flex-direction: column;
    align-self: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .site-header--open .site-header__nav {
    max-height: 30rem;
    border-top: 1px solid color-mix(in oklch, var(--brass) 20%, transparent);
  }

  .site-header__nav a {
    display: block;
    padding: 0.875rem 0.5rem;
    font-size: 0.875rem;
    border-left: none;
    border-right: none;
    border-bottom: 1px solid color-mix(in oklch, var(--brass) 15%, transparent);
  }

  .site-header__nav a:last-child {
    border-right: none;
    border-bottom: none;
  }

  .site-header__nav a.is-current {
    box-shadow: none;
    border-left: 3px solid var(--ember);
    padding-left: calc(0.5rem - 3px);
  }
}

.site-footer {
  padding: 2rem 1.5rem 1.5rem;
  border-top: 1px solid color-mix(in oklch, var(--brass) 45%, transparent);
  text-align: center;
  font-size: 0.85rem;
  background-color: color-mix(in oklch, var(--emerald) 4%, var(--ink));
}

.site-footer__inner {
  max-width: 56rem;
  margin: 0 auto;
}

.site-footer__name {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--brass);
}

.site-footer__details {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1.5rem;
  max-width: 26rem;
  margin: 0 auto 1.25rem;
  text-align: left;
}

.site-footer__details dt {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: color-mix(in oklch, var(--brass) 50%, transparent);
  padding-top: 0.1em;
}

.site-footer__details dd {
  margin: 0;
  font-size: 0.8rem;
  color: color-mix(in oklch, var(--brass) 75%, var(--ink));
}

.site-footer__copy {
  margin: 0;
  font-size: 0.72rem;
  color: color-mix(in oklch, var(--brass) 40%, transparent);
  border-top: 1px solid color-mix(in oklch, var(--brass) 15%, transparent);
  padding-top: 1rem;
}