/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

/* ── Variables ── */
:root {
  --color-primary: #000000;
  --color-bg: #ffffff;
  --color-secondary: #8a8a8a;
  --page-padding: 20px;
  --header-height: 60px;
}

/* ── Base ── */
html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-primary);
}

/* ── Header ── */
.header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-primary);
}

.header__inner {
  height: 100%;
  padding: var(--page-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.header__contact {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: color 0.15s ease;
}

.header__contact:hover {
  color: #666;
}

/* ── ハンバーガー ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 40px;
  height: 1px;
  background: var(--color-primary);
  transition: transform 0.25s ease;
}

.hamburger.is-open span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.hamburger.is-open span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ── モバイルナビ ── */
.mobile-nav {
  position: relative;
  z-index: 100;
  padding: 28px var(--page-padding);
  border-bottom: 1px solid var(--color-primary);
  background: var(--color-bg);
}

.mobile-nav__link {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding-bottom: 28px;
}

.mobile-nav__link:last-child {
  padding-bottom: 0;
}

/* ── Hero ── */
.hero {
  position: relative;
  height: calc(100vh - var(--header-height));
  display: flex;
}

.hero__image-col {
  width: 57.14%;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

.hero__image-col::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 90px;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.28));
  pointer-events: none;
}

.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.hero__text-col {
  flex: 1;
  display: flex;
  align-items: center;
  padding-left: var(--page-padding);
}

.hero__description {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.65;
}

/* ── Bottom Nav ── */
.hero__bottom-nav {
  position: absolute;
  bottom: var(--page-padding);
  left: var(--page-padding);
  right: var(--page-padding);
  display: flex;
  justify-content: space-between;
}

.hero__nav-link {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #fff;
  transition: opacity 0.15s ease;
}

.hero__nav-link:hover {
  opacity: 0.6;
}

.header__contact .char,
.hero__nav-link .char {
  display: inline-block;
}

/* INFO は白カラム上に乗るため PC のみ黒 */
@media (min-width: 769px) {
  .hero__nav-link:last-child {
    color: var(--color-primary);
  }
}

/* ── SP (≤768px) ── */
@media (max-width: 768px) {
  :root {
    --page-padding: 15px;
    --header-height: 50px;
  }

  .header__nav-pc { display: none; }
  .hamburger      { display: flex; }

  .hero__image-col {
    width: 100%;
  }

  .hero__text-col {
    display: none;
  }

  .hero__bottom-nav {
    bottom: 28px;
  }
}