/* =========================================
   header.css
   - 共通CSS変数（:root）
   - リセット / ベース
   - ヘッダー / グローバルナビ / ロゴ
   ========================================= */

:root {
  --color-paper: #F3F4F1;
  --color-white: #FFFFFF;
  --color-ink: #1A1C1A;
  --color-quiet: #4E534F;
  --color-rule: #D4D8D3;
  --color-sage: #E6EBE3;
  --color-night: #1A1C1A;
  --color-steel: #1A1C1A;
  --color-mark: var(--color-ink);
  --color-moss: var(--color-ink);
  --color-leaf: var(--color-ink);
  --color-live: #5F6B63;
  --color-primary: var(--color-ink);
  --color-primary-dark: var(--color-ink);
  --color-text: var(--color-ink);
  --color-text-sub: var(--color-quiet);
  --color-bg: var(--color-paper);
  --color-bg-gray: #EBEEE8;
  --color-border: var(--color-rule);
  --font-display: 'Shippori Mincho', 'Hiragino Mincho ProN', serif;
  --font-family: 'IBM Plex Sans JP', sans-serif;
  --font-num: 'IBM Plex Mono', ui-monospace, monospace;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --font-size-base: 16px;
  --spacing-section: 96px;
  --border-radius: 0;
  --shadow-card: none;
  --container-width: 1180px;
  --gutter: 48px;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

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

:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 3px;
}

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

ul, ol, dl, dd {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-paper);
  z-index: 1000;
}

.site-header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 22px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.site-header a:hover {
  text-decoration: none;
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__logo img {
  height: 22px;
  width: auto;
  max-width: none;
  object-fit: contain;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.global-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.global-nav__list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.global-nav__item--mobile-only {
  display: none;
}

.global-nav__link {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text);
  padding: 6px 0;
}

.global-nav__link:hover {
  color: var(--color-quiet);
}

.site-header__contact {
  font-size: 13px;
  color: var(--color-ink);
  white-space: nowrap;
}

.site-header__menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  position: relative;
}

.site-header__menu-btn span {
  position: absolute;
  left: 6px;
  right: 6px;
  height: 1px;
  background-color: var(--color-text);
  transition: transform .25s ease, opacity .2s ease, top .25s ease;
}

.site-header__menu-btn span:nth-child(1) { top: 12px; }
.site-header__menu-btn span:nth-child(2) { top: 17px; }
.site-header__menu-btn span:nth-child(3) { top: 22px; }

.site-header__menu-btn.is-active span:nth-child(1) {
  top: 17px;
  transform: rotate(45deg);
}
.site-header__menu-btn.is-active span:nth-child(2) {
  opacity: 0;
}
.site-header__menu-btn.is-active span:nth-child(3) {
  top: 17px;
  transform: rotate(-45deg);
}

@media (max-width: 1024px) {
  :root {
    --gutter: 28px;
  }

  .global-nav__list {
    gap: 16px;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }

  .global-nav__item--mobile-only {
    display: list-item;
  }

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

  .site-header__contact {
    display: none;
  }

  .global-nav {
    position: fixed;
    top: 64px;
    left: 0;
    z-index: 1001;
    width: 100%;
    height: calc(100dvh - 64px);
    background: var(--color-paper);
    border-top: 1px solid var(--color-rule);
    padding: 24px 20px 32px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .28s ease, visibility 0s linear .28s;
  }

  .global-nav.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition-delay: 0s;
  }

  .global-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-width: 560px;
    width: 100%;
    margin: 0 auto;
  }

  .global-nav__link {
    display: block;
    padding: 16px 8px;
    border-bottom: 1px solid var(--color-rule);
    font-size: 16px;
    text-align: left;
  }

  .site-header__inner {
    padding: 14px var(--gutter);
    justify-content: flex-start;
  }

  .site-header__logo {
    margin-right: auto;
  }
}