html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

/* ---- ヒーロー(海と船) ---- */

.hero {
  position: relative;
  height: 100dvh;
  overflow: hidden;
}

#sea {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
}

/* WebGL不可時のフォールバック背景 */
body.no-webgl .hero {
  background: linear-gradient(
    to bottom,
    var(--paper) 0%,
    var(--paper) 52%,
    #17171a 53%,
    #0a0a0c 100%
  );
}

.menu {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(4rem, 12vh, 8rem);
  padding-top: 15vh;
  text-align: center;
}

.site-name {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 400;
  letter-spacing: 0.2em;
}

.menu nav {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.menu nav a {
  position: relative;
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  letter-spacing: 0.35em;
  padding: 0.35em 1em;
  text-indent: 0.35em; /* letter-spacing末尾分の光学補正 */
}

.menu nav a::after {
  content: "";
  position: absolute;
  left: 15%;
  right: 15%;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}

.menu nav a:hover::after,
.menu nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu nav a:focus-visible {
  outline: none;
}

/* ---- コンテンツセクション ---- */

.content {
  width: min(42rem, 100% - 3rem);
  margin: 0 auto;
}

.content section {
  padding: 5.5rem 0 2rem;
  scroll-margin-top: 1rem;
}

.content h2 {
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-align: center;
  margin-bottom: 2.8rem;
}

.content h2::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 1px;
  background: var(--ink);
  margin: 1.2rem auto 0;
}

.content p {
  margin-bottom: 1.5em;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: 1.1em 0.5em;
  border-bottom: 1px solid rgba(10, 10, 12, 0.15);
  text-align: left;
  vertical-align: top;
  font-weight: 300;
}

.company-table th {
  width: 8.5em;
  letter-spacing: 0.15em;
  white-space: nowrap;
  color: var(--ink-soft);
}

.service-list {
  list-style: none;
}

.service-list li {
  padding: 1.1em 0.5em;
  border-bottom: 1px solid rgba(10, 10, 12, 0.15);
  letter-spacing: 0.1em;
}

.coming-soon {
  margin-left: 1em;
  font-size: 0.75em;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

.news-list {
  list-style: none;
}

.news-list li {
  display: flex;
  gap: 2rem;
  padding: 1.1em 0.5em;
  border-bottom: 1px solid rgba(10, 10, 12, 0.15);
}

.news-list time {
  color: var(--ink-soft);
  white-space: nowrap;
  font-size: 0.9em;
  letter-spacing: 0.05em;
}

.content a {
  border-bottom: 1px solid var(--ink-soft);
  padding-bottom: 0.1em;
  transition: border-color 0.25s ease;
}

.content a:hover {
  border-bottom-color: var(--ink);
}

.placeholder {
  color: var(--ink-soft);
  text-align: center;
  padding: 1rem 0;
}

.page-footer {
  padding: 5rem 1.5rem 2.5rem;
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}

@media (max-width: 640px) {
  .menu {
    gap: 2.4rem;
  }
  .menu nav {
    gap: 1.1rem;
  }
  .menu nav a {
    padding: 0.5em 1em; /* タップターゲット確保 */
  }
  .news-list li {
    flex-direction: column;
    gap: 0.2rem;
  }
}