:root {
  --navy: #1f4e8c;
  --blue: #2b6cb0;
  --text: #333;
  --muted: #666;
  --line: #e6e6e6;
  --bg: #f7f7f7;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.75;
  font-size: 15px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { width: calc(100% - 48px); max-width: 1180px; margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #222;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand img {
  width: 44px;
  height: 44px;
  object-fit: cover;
  object-position: center;
}
.brand-name { display: block; font-size: 16px; font-weight: 600; }
.brand-en {
  display: block;
  font-size: 11px;
  color: #888;
  letter-spacing: 0.02em;
}
.nav { display: flex; flex-wrap: wrap; gap: 4px 8px; }
.nav a {
  padding: 8px 12px;
  color: #444;
  font-size: 15px;
}
.nav a:hover,
.nav a.current {
  color: var(--blue);
  text-decoration: none;
}

.hero {
  position: relative;
  min-height: 78vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a2a3a center / cover no-repeat;
  color: #fff;
  text-align: center;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 32, 48, 0.38);
}
.hero-inner { position: relative; z-index: 1; padding: 80px 24px; }
.hero-kicker {
  margin: 0 0 12px;
  font-size: 18px;
  letter-spacing: 0.18em;
  color: rgba(255,255,255,.9);
}
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 500;
  letter-spacing: 0.18em;
}
.hero p {
  margin: 0 auto;
  max-width: 560px;
  font-size: 16px;
  color: rgba(255,255,255,.88);
}

.page-banner {
  position: relative;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a2a3a center / cover no-repeat;
  color: #fff;
  text-align: center;
}
.page-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(20, 32, 48, 0.42);
}
.page-banner h1 {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 32px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.section { padding: 64px 0 80px; }
.section-alt { background: var(--bg); }
.sec-head { text-align: center; margin: 0 0 40px; }
.sec-head h2 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 600;
  color: #222;
}
.sec-head span {
  display: block;
  font-size: 13px;
  color: #999;
  letter-spacing: 0.08em;
}
.lead {
  max-width: 780px;
  margin: 0 auto 36px;
  color: var(--muted);
  text-align: center;
}
.intro-block p {
  max-width: 780px;
  margin: 0 auto 16px;
  color: var(--muted);
  text-align: center;
}
.case-meta {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--blue);
  letter-spacing: 0.04em;
}
.more {
  margin: 28px 0 0;
  text-align: center;
}
.more a {
  display: inline-block;
  padding: 8px 22px;
  border: 1px solid var(--blue);
  color: var(--blue);
  text-decoration: none;
}
.more a:hover { background: var(--blue); color: #fff; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.product-grid.home-grid {
  grid-template-columns: repeat(4, 1fr);
}
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  display: block;
}
a.product-card:hover { text-decoration: none; }
.product-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.product-card .body { padding: 20px 18px 22px; }
.product-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
}
.product-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.scene-list {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
  align-items: center;
}
.scene-list + .scene-list { margin-top: 48px; }
.scene-list.reverse { grid-template-columns: 1fr 1.2fr; }
.scene-list img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}
.scene-copy h3 {
  margin: 0 0 12px;
  font-size: 22px;
}
.scene-copy p { margin: 0 0 10px; color: var(--muted); }
.scene-copy p:last-child { margin-bottom: 0; }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.about-grid img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}
.about-copy p { margin: 0 0 14px; text-indent: 2em; }
.info-table {
  width: 100%;
  margin-top: 18px;
  border-collapse: collapse;
  font-size: 14px;
  background: #fff;
  border: 1px solid var(--line);
}
.info-table th,
.info-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.info-table th {
  width: 108px;
  color: var(--muted);
  font-weight: 600;
  background: #fafafa;
}
.info-table tr:last-child th,
.info-table tr:last-child td { border-bottom: none; }

.news-list { display: grid; gap: 16px; }
.news-item {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.news-item:last-child { border-bottom: none; }
.news-item time { color: #999; font-size: 13px; }
.news-item h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.news-item p { margin: 0; color: var(--muted); font-size: 14px; }

.contact-box {
  max-width: 720px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  padding: 28px 24px;
}
.contact-box p { margin: 0 0 10px; }
.contact-box p:last-child { margin-bottom: 0; }

.site-footer {
  background: #f3f3f3;
  color: #777;
  font-size: 13px;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.1fr;
  gap: 24px;
  padding: 40px 0 28px;
}
.site-footer h3 {
  margin: 0 0 12px;
  color: #333;
  font-size: 15px;
}
.site-footer p { margin: 0 0 8px; }
.site-footer a { color: #777; }
.site-footer a:hover { color: var(--blue); }
.site-footer ul { margin: 0; padding: 0; list-style: none; }
.site-footer li { margin: 6px 0; }
.footer-copy {
  border-top: 1px solid #e0e0e0;
  padding: 14px 0 22px;
  text-align: center;
}
.footer-copy p { margin: 4px 0; }

@media (max-width: 900px) {
  .product-grid,
  .product-grid.home-grid,
  .scene-list,
  .scene-list.reverse,
  .about-grid,
  .footer-main { grid-template-columns: 1fr; }
  .scene-list.reverse img { order: -1; }
  .hero { min-height: 62vh; }
  .section { padding: 48px 0; }
  .header-inner { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .page-banner { height: 160px; }
  .page-banner h1 { font-size: 24px; }
}