/* ==========================================================================
   Layout — header / footer / grid / section rhythm
   ========================================================================== */

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

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-2xl);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section-header {
  max-width: 640px;
  margin-bottom: var(--space-lg);
}

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

/* --- Header / Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(250, 248, 244, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.nav.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  letter-spacing: 0.04em;
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-md);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__toggle {
  display: inline-flex;
  background: none;
  border: none;
  padding: var(--space-2xs);
}

/* 画面が狭い間は上部CTAボタンを隠し、下部のsticky-ctaに導線を一本化する */
.nav__right > .btn {
  display: none;
}

@media (min-width: 640px) {
  .nav__right > .btn {
    display: inline-flex;
  }
}

@media (min-width: 900px) {
  .nav__links {
    display: flex;
  }
  .nav__toggle {
    display: none;
  }
}

.nav__mobile {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition: grid-template-rows var(--transition-slow);
}

.nav__mobile > * {
  min-height: 0;
}

.nav__mobile__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: 0 0 var(--space-lg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xs);
  overflow: hidden;
}

.nav__mobile.is-open {
  grid-template-rows: 1fr;
}

@media (min-width: 900px) {
  .nav__mobile {
    display: none !important;
  }
}

/* --- Hero --- */
.hero {
  position: relative;
  z-index: 0; /* stacking contextを作り、hero__mediaのz-index:-1がページ全体ではなくhero内だけで背面に来るようにする */
  min-height: 92vh;
  min-height: 92svh; /* モバイルのアドレスバー分の誤差を吸収 */
  display: flex;
  align-items: center;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  overflow: hidden;
}

@media (max-width: 640px) {
  .hero {
    min-height: auto;
    padding-top: calc(var(--space-2xl) + var(--space-md));
    padding-bottom: var(--space-2xl);
  }
}

/* 実写真がまだ無い場合の代替背景(後で .hero__media に画像/動画を追加すれば自動的に写真優先になる) */
.hero--gradient {
  background: radial-gradient(circle at 20% 20%, #2a2621 0%, var(--color-ink) 55%, #100f0e 100%);
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__media img,
.hero__media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%; /* 夕焼けの富士山(#001)の山頂が中心に来る位置 */
}

.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 27, 25, 0.25) 0%, rgba(28, 27, 25, 0.5) 100%);
}

.hero__content {
  position: relative;
  color: var(--color-white);
  max-width: 720px;
}

.hero__content p {
  color: rgba(255, 255, 255, 0.85);
}

/* --- Grids --- */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid--experiences {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid--2 {
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid--reasons {
  grid-template-columns: repeat(2, 1fr);
}

/* --- Footer --- */
.footer {
  padding-block: var(--space-xl) var(--space-lg);
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.7);
}

.footer a {
  color: rgba(255, 255, 255, 0.85);
}

.footer__top {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  justify-content: space-between;
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: var(--space-md);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: space-between;
  font-size: var(--fs-small);
}

/* --- Sticky mobile CTA --- */
.sticky-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-header);
  padding: var(--space-xs) var(--container-padding);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

@media (min-width: 900px) {
  .sticky-cta {
    display: none;
  }
}