/* ==========================================================================
   base.css — リセット・基本タイポグラフィ・ヘッダー・ナビ・フッター
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text-body);
  background-color: var(--c-white);
  overflow-x: hidden;
}

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

figure {
  margin: 0;
}

h1, h2, h3, h4, p, ul, ol, dl, dd {
  margin-top: 0;
}

a {
  color: var(--c-navy);
  text-decoration: none;
  transition: opacity 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

a:hover {
  opacity: 0.85;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--c-yamabuki);
  outline-offset: 3px;
}

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

/* --- 共通セクション見出し --- */
.sec-eyebrow {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-navy);
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
}

.sec-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.6vw, 2.75rem);
  font-weight: 600;
  line-height: 1.22;
  color: var(--c-text-main);
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   Header & Navigation (JS無効でも開閉・閲覧可能な <details> メニュー)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-navy-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: 0.5rem;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--c-text-main);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(0.88rem, 2.2vw, 1.45rem);
  letter-spacing: 0.03em;
  min-width: 0;
}

.brand-logo img {
  width: 40px;
  height: auto;
  flex-shrink: 0;
}

/* MENU ドロップダウン (<details> ベースでJS不要) */
.nav-menu {
  position: relative;
  flex-shrink: 0;
}

.nav-trigger {
  list-style: none;
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--c-navy);
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-pill);
  transition: background-color 0.2s ease;
}

@media (max-width: 480px) {
  .header-inner {
    min-height: 64px;
  }
  .brand-logo {
    gap: 0.45rem;
    font-size: 0.85rem;
    letter-spacing: 0.01em;
  }
  .brand-logo img {
    width: 30px;
  }
  .nav-trigger {
    font-size: 0.78rem;
    padding: 0.45rem 0.85rem;
    gap: 0.35rem;
  }
}

.nav-trigger::-webkit-details-marker {
  display: none;
}

.nav-trigger:hover {
  background-color: var(--c-teal);
}

.nav-trigger-dots {
  display: inline-grid;
  grid-template-columns: repeat(2, 3px);
  gap: 3px;
}

.nav-trigger-dots span {
  width: 3px;
  height: 3px;
  background-color: var(--c-yamabuki);
  border-radius: 50%;
}

.nav-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 0.6rem);
  width: min(300px, calc(100vw - 2.5rem));
  background-color: var(--c-white);
  border: 1px solid var(--c-navy-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-float);
  padding: 0.75rem;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.nav-list a {
  display: block;
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--c-text-main);
}

.nav-list a:hover {
  background-color: var(--c-navy-tint);
  color: var(--c-navy);
  opacity: 1;
}

.nav-list .nav-cta-link {
  margin-top: 0.35rem;
  background-color: var(--c-navy);
  color: var(--c-white);
  text-align: center;
  font-weight: 600;
}

.nav-list .nav-cta-link:hover {
  background-color: var(--c-teal);
  color: var(--c-white);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--c-navy);
  color: var(--c-white);
  padding-block: 2.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.footer-logo img {
  width: 34px;
  height: auto;
  background-color: var(--c-white);
  padding: 3px 4px;
  border-radius: 4px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: var(--c-white);
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.social-link:hover {
  background-color: rgba(255, 255, 255, 0.12);
  border-color: var(--c-yamabuki);
  opacity: 1;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.8);
  margin: 0;
}