/* ============================================================
   DESIGN TOKENS
============================================================ */
:root {
  --white:        #FFFFFF;
  --off-white:    #F8F7F5;
  --black:        #141414;
  --gray-100:     #EDECE9;
  --gray-300:     #C8C6C0;
  --gray-500:     #8C8A84;
  --gray-700:     #4A4846;
  --gold:         #9A7B2E;
  --gold-light:   #C9A84C;
  --gold-pale:    #EAD99B;

  --font-display: 'Cormorant Garamond', 'Noto Serif JP', Georgia, serif;
  --font-body:    'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;

  --header-h:     68px;
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* ============================================================
   CONTAINER
============================================================ */
.container {
  max-width: 1160px;
  margin: 0 auto;
  width: 100%;
}
@media (max-width: 1256px) {
  .container { padding: 0 48px; }
}
@media (max-width: 900px) {
  .container { padding: 0 24px; }
}

/* ============================================================
   HEADER
============================================================ */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  padding: 0;
  z-index: 1001;
  transition: background 0.4s var(--ease), border-bottom 0.4s var(--ease);
}

#header.hero-mode {
  background: linear-gradient(to bottom, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.50) 50%, transparent 100%);
  border-bottom: none;
}
#header.hero-mode .logo { color: var(--white); }
#header.hero-mode nav a { color: rgba(255,255,255,0.75); }
#header.hero-mode nav a:hover { color: var(--white); }
#header.hero-mode .header-contact {
  border-color: rgba(255,255,255,0.5);
  color: var(--white);
}

#header.solid {
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
}

.logo {
  display: flex;
  align-items: center;
  transition: opacity 0.3s;
}
.logo:hover { opacity: 0.8; }
.logo-img { height: 36px; width: auto; display: block; }
#header.solid .logo-img { filter: none; }

.logo-text {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 20px;
  font-weight: 300;
  letter-spacing: 0.28em;
  color: var(--white);
  margin-left: 12px;
  transition: color 0.4s;
  line-height: 1;
}
#header.solid .logo-text { color: var(--black); }

nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
nav a {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray-700);
  transition: color 0.2s;
}
nav a:hover { color: var(--gold); }

.header-contact {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 1px solid var(--gray-300);
  padding: 8px 20px;
  color: var(--gray-700);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.header-contact:hover {
  background: var(--black);
  border-color: var(--black);
  color: var(--white);
}

/* ============================================================
   HAMBURGER & MOBILE MENU
============================================================ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: 1001;
  position: relative;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.4s var(--ease), opacity 0.3s, width 0.4s var(--ease);
  transform-origin: center;
}
#header.solid .hamburger span { background: var(--black); }

.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; width: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
.hamburger.open span { background: var(--white) !important; }
#header.solid .hamburger.open span { background: var(--black) !important; }

#mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--black);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 100px 40px 60px;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.65s var(--ease);
  pointer-events: none;
}
#mobile-menu.open {
  clip-path: inset(0 0 0% 0);
  pointer-events: auto;
}

.mm-nav { list-style: none; width: 100%; margin-bottom: 48px; }
.mm-nav li { border-bottom: 1px solid rgba(255,255,255,0.08); overflow: hidden; }
.mm-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--white);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease), color 0.2s;
}
.mm-nav a:hover { color: var(--gold-light); }

#mobile-menu.open .mm-nav a { opacity: 1; transform: translateY(0); }
#mobile-menu.open .mm-nav li:nth-child(1) a { transition-delay: 0.15s; }
#mobile-menu.open .mm-nav li:nth-child(2) a { transition-delay: 0.22s; }
#mobile-menu.open .mm-nav li:nth-child(3) a { transition-delay: 0.29s; }
#mobile-menu.open .mm-nav li:nth-child(4) a { transition-delay: 0.36s; }
#mobile-menu.open .mm-nav li:nth-child(5) a { transition-delay: 0.43s; }
#mobile-menu.open .mm-nav li:nth-child(6) a { transition-delay: 0.50s; }

.mm-logo {
  position: absolute;
  bottom: 32px;
  right: 40px;
  opacity: 0;
  transition: opacity 0.4s 0.6s var(--ease);
}
#mobile-menu.open .mm-logo { opacity: 1; }

@media (max-width: 900px) {
  .hamburger { display: flex; position: fixed; top: 8px; right: 24px; z-index: 1100; }
  #header nav, .header-contact { display: none; }
}

/* ============================================================
   SECTION BASE
============================================================ */
section {
  padding: 88px 0;
  border-top: 1px solid var(--gray-100);
}

.sec-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
}

.sec-en {
  display: block;
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}
.sec-ja {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--black);
  line-height: 1;
}
.sec-rule {
  width: 24px;
  height: 2px;
  background: var(--gold-light);
  margin-top: 14px;
}

.view-more {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
  border-bottom: 1px solid var(--gray-300);
  padding-bottom: 3px;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.view-more:hover { color: var(--gold); border-color: var(--gold); }

/* ============================================================
   BUTTONS
============================================================ */
.btn {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 16px 44px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-primary { background: var(--white); color: var(--black); }
.btn-primary:hover { background: var(--gold-light); color: var(--white); }
.btn-outline { border: 1px solid rgba(255,255,255,0.35); color: rgba(255,255,255,0.75); }
.btn-outline:hover { border-color: var(--white); color: var(--white); }
.btn-group { display: flex; justify-content: center; gap: 20px; }

/* ============================================================
   PAGE HERO（ライト：会社案内・事業内容・お問い合わせ等共通）
============================================================ */
.page-hero {
  margin-top: var(--header-h);
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--gray-100);
  background: var(--off-white);
}
.page-hero-en {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
  display: block;
}
.page-hero-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--black);
  margin-bottom: 20px;
}
.page-hero-sub {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.85;
  max-width: 520px;
}

/* ============================================================
   NEWS LIST（TOPページ・アーカイブ共通）
============================================================ */
.news-list {}
.news-item {
  display: grid;
  grid-template-columns: 96px 100px 1fr;
  align-items: baseline;
  gap: 0 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--gray-100);
  transition: background 0.2s;
}
.news-item:hover { background: var(--off-white); margin: 0 -48px; padding: 18px 48px; }

.news-date {
  font-size: 11px;
  color: var(--gray-500);
  letter-spacing: 0.04em;
  font-family: var(--font-display);
}
.news-cat {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--gray-500);
  border: 1px solid var(--gray-300);
  padding: 3px 10px;
  display: inline-block;
}
.news-title {
  font-size: 14px;
  color: var(--black);
  letter-spacing: 0.03em;
  line-height: 1.6;
}

/* ============================================================
   FOOTER
============================================================ */
#footer {
  background: var(--black);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 40px 24px 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 40px;
}

.footer-logo { display: flex; align-items: center; }
.footer-logo-img { height: 32px; width: auto; }
.footer-logo-text {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 18px;
  font-weight: 300;
  letter-spacing: 0.28em;
  color: rgba(255,255,255,0.7);
  margin-left: 10px;
  line-height: 1;
}

.footer-address {
  font-size: 11px;
  color: rgba(255,255,255,0.35);
  line-height: 1.9;
  letter-spacing: 0.03em;
  margin-top: 16px;
  white-space: nowrap;
}

.footer-nav-group {
  display: flex;
  gap: 48px;
  justify-content: end;
}
.footer-nav-col p {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}
.footer-nav-col ul { list-style: none; }
.footer-nav-col li { margin-bottom: 8px; }
.footer-nav-col a {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.04em;
  transition: color 0.2s;
}
.footer-nav-col a:hover { color: rgba(255,255,255,0.85); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.footer-bottom a {
  font-size: 10px;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.footer-bottom a:hover { color: rgba(255,255,255,0.6); }
.footer-copy {
  font-size: 10px;
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.06em;
}

/* ============================================================
   UTILITIES
============================================================ */
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }

/* ============================================================
   RESPONSIVE — 共通要素
============================================================ */
@media (max-width: 900px) {
  :root { --header-h: 56px; }
  #header { padding: 0 24px; }
  section { padding: 64px 0; }

  .news-item { grid-template-columns: 1fr; gap: 4px; }
  .news-item:hover { margin: 0; padding: 18px 0; }

  .footer-inner  { grid-template-columns: 1fr; gap: 32px; }
  .footer-address { white-space: normal; }
  .footer-nav-group { display: block; }
  .footer-nav-col { margin-bottom: 24px; }
  .footer-nav-col ul { display: flex; flex-wrap: wrap; gap: 0 32px; }

  .page-hero { padding: 48px 0 40px; }
}