/* ============================================================
   layout.css
   ページ全体の骨組み（ヘッダー・フッター・コンテナ・セクション余白）
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: clamp(64px, 10vw, 140px);
  position: relative;
}

/* ---------- セクション間の区切り（グロー装飾ライン） ---------- */
.section + .section::before {
  content: "";
  display: block;
  width: min(200px, 60%);
  height: 1px;
  margin: 0 auto clamp(64px, 10vw, 140px);
  background: var(--gradient-tiffany-gold);
  opacity: 0.25;
}

.section-head {
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: clamp(40px, 6vw, 72px);
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-tiffany);
  margin-bottom: 18px;
}

.eyebrow::before,
.eyebrow::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gradient-tiffany-gold);
}

.section-desc {
  margin-top: 18px;
  margin-inline: auto;
  font-size: 1.05rem;
  max-width: 60ch;
}

.section-head.center .section-desc {
  margin-inline: auto;
}

/* ---------- 背景のネオングリッド演出 ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(129, 216, 208, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(129, 216, 208, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
  pointer-events: none;
}

.bg-noise {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
  pointer-events: none;
  background: var(--gradient-hero);
}

/* ============================================================
   ヘッダー
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding: 18px 0;
  transition: background var(--transition-base), padding var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  padding: 12px 0;
  background: rgba(5, 6, 8, 0.72);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}

.logo-text {
  font-weight: 700;
}

.logo-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--gradient-tiffany-gold);
  color: var(--color-black);
  font-weight: 700;
  box-shadow: var(--shadow-glow-tiffany);
}

.logo-text .accent {
  background: var(--gradient-tiffany-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  position: relative;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--gradient-tiffany-gold);
  transition: width var(--transition-fast);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   フッター
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 64px 32px;
  background: var(--color-black-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 18px;
  color: var(--color-text);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a,
.footer-col p {
  font-size: 0.92rem;
  color: var(--color-text-dim);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-tiffany);
}

.footer-brand p {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 0.9rem;
}

.social-row {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.social-row a {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.social-row a:hover {
  border-color: var(--color-tiffany);
  color: var(--color-tiffany);
  transform: translateY(-3px);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--color-text-faint);
}

.footer-bottom .legal-links {
  display: flex;
  gap: 20px;
}

.footer-bottom .legal-links a:hover {
  color: var(--color-tiffany);
}