:root {
  --navy: #0a2f52;
  --green: #08775f;
  --mint: #e4f6ec;
  --blue: #e5f3fb;
  --ivory: #fff8e7;
  --sage: #edf5df;
  --pearl: #f3f6f8;
  --ink: #17334a;
  --muted: #557083;
  --line: #d5e1e7;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .02em;
}
a { color: inherit; }
.container { width: min(1180px, calc(100% - 56px)); margin: 0 auto; }

.site-header {
  height: 78px;
  background: rgba(255,255,255,.98);
  border-bottom: 1px solid #e1e8ec;
  position: relative;
  z-index: 10;
}
.header-inner {
  width: min(1280px, calc(100% - 64px));
  height: 100%; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { text-decoration: none; color: var(--navy); font-weight: 800; font-size: 23px; letter-spacing: .03em; }
nav { display: flex; gap: 34px; }
nav a { text-decoration: none; color: #314b60; font-size: 14px; font-weight: 700; }
nav a:hover { color: var(--green); }

.hero { height: 600px; position: relative; overflow: hidden; background: #e7f3f9; }
.hero-image { position: absolute; inset: 0; background: url('assets/maruun-front.png') center center / cover no-repeat; filter: saturate(.92) contrast(1.06); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(255,255,255,.98) 0%, rgba(255,255,255,.83) 35%, rgba(255,255,255,.18) 63%, rgba(255,255,255,.04) 100%); }
.hero-copy { position: relative; z-index: 2; width: min(1280px, calc(100% - 64px)); margin: 0 auto; padding-top: 76px; }
.project-name { margin: 0 0 8px; color: var(--navy); font-size: 21px; font-weight: 700; }
h1,h2,.hero-message { font-family: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif; }
h1 { margin: 0 0 20px; color: var(--navy); font-size: 54px; line-height: 1.25; letter-spacing: .015em; }
h1 span { color: var(--green); font-size: 68px; }
.hero-message { display: inline; margin: 0; color: #075b4c; font-size: 35px; font-weight: 700; line-height: 1.55; background: linear-gradient(transparent 60%, rgba(218,246,220,.9) 60%); }
.image-note { position: absolute; right: 32px; bottom: 8px; z-index: 2; margin: 0; font-size: 12px; color: #40576a; background: rgba(255,255,255,.72); padding: 2px 8px; }

.section { padding: 86px 0; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.eyebrow { margin: 0 0 8px; color: var(--green); font-size: 13px; font-weight: 800; letter-spacing: .18em; }
h2 { margin: 0 0 28px; color: var(--navy); font-size: 38px; line-height: 1.35; }
.lead-box { margin: 0 0 22px; padding: 20px 24px; background: linear-gradient(105deg, var(--mint), var(--ivory)); border-left: 4px solid #44ad78; color: #135142; font-size: 20px; font-weight: 700; }
.zeb-card { display: grid; grid-template-columns: 120px 1fr; gap: 28px; align-items: center; padding: 44px; background: linear-gradient(135deg, var(--blue), var(--mint)); border: 1px solid #d2eae3; border-radius: 18px; box-shadow: 0 15px 45px rgba(33,85,99,.08); }
.zeb-icon { width: 110px; height: 110px; display: grid; place-items: center; background: rgba(255,255,255,.82); border-radius: 50%; color: var(--green); font-size: 54px; font-weight: 300; }
.zeb-title { margin: 0; color: var(--green); font: 700 45px/1.1 Georgia, serif; }
.zeb-card h3 { margin: 10px 0; color: var(--navy); font-size: 21px; }
.zeb-card p:last-child { margin: 0; font-size: 15px; line-height: 1.7; }

.overview { background: linear-gradient(120deg, #fff 0%, #fff 53%, var(--ivory) 100%); }
.overview-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 56px; align-items: center; }
.concept-frame { height: 405px; overflow: hidden; position: relative; background: #eef5f8; box-shadow: 0 18px 48px rgba(18,52,75,.13); }
.concept-frame img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.building-list { margin: 0; border-top: 2px solid var(--green); background: rgba(255,255,255,.84); }
.building-list div { display: grid; grid-template-columns: 122px 1fr; border-bottom: 1px solid var(--line); }
.building-list dt,.building-list dd { margin: 0; padding: 15px 18px; }
.building-list dt { background: var(--mint); color: var(--navy); font-weight: 700; }
.building-list dd { font-weight: 600; }

.technology { background: linear-gradient(180deg, #ecf8fd 0%, #f7fbfd 100%); }
.section-intro { margin: -12px 0 38px; color: var(--muted); }
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tech-grid article { padding: 28px 24px 24px; min-height: 220px; border: 1px solid rgba(136,165,177,.25); border-radius: 14px; box-shadow: 0 10px 28px rgba(40,91,110,.06); }
.tech-grid article:nth-child(1) { background: var(--mint); }
.tech-grid article:nth-child(2) { background: var(--blue); }
.tech-grid article:nth-child(3) { background: var(--ivory); }
.tech-grid article:nth-child(4) { background: var(--sage); }
.tech-grid article:nth-child(5) { background: var(--pearl); }
.tech-grid article:nth-child(6) { background: #eaf7f5; }
.tech-grid article > span { display: block; height: 48px; color: var(--green); font-size: 40px; line-height: 1; }
.tech-grid h3 { margin: 12px 0 6px; color: var(--navy); font-size: 19px; }
.tech-grid p { margin: 0; font-size: 15px; line-height: 1.65; }

.sdgs-section { background: linear-gradient(135deg, #fffdf6, #f0faf5); }
.sdg-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.sdg { min-height: 126px; padding: 18px; border-radius: 12px; color: #fff; display: flex; gap: 13px; align-items: center; box-shadow: 0 10px 25px rgba(19,58,72,.10); }
.sdg strong { font-size: 42px; line-height: 1; }
.sdg span { font-size: 13px; font-weight: 800; line-height: 1.45; }
.sdg7 { background: #FCC30B; }
.sdg9 { background: #FD6925; }
.sdg11 { background: #FD9D24; }
.sdg12 { background: #BF8B2E; }
.sdg13 { background: #3F7E44; }

footer { padding: 48px 0; background: var(--navy); color: #fff; }
.footer-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; }
footer p { margin: 3px 0; font-size: 14px; }
.footer-name { margin-bottom: 10px; font-size: 20px; font-weight: 800; }
footer a { color: #c9f2e4; }
.copyright { opacity: .82; }

@media (max-width: 900px) {
  nav { display: none; }
  .hero { height: 620px; }
  .hero-image { background-position: center; }
  .hero-overlay { background: linear-gradient(180deg, rgba(255,255,255,.95), rgba(255,255,255,.56)); }
  .hero-copy { padding-top: 54px; }
  h1 { font-size: 38px; } h1 span { font-size: 50px; }
  .hero-message { font-size: 27px; }
  .two-column,.overview-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2,1fr); }
  .sdg-grid { grid-template-columns: repeat(2,1fr); }
  .footer-inner { display: block; }
  .copyright { margin-top: 28px; }
}

@media (max-width: 560px) {
  .container,.header-inner,.hero-copy { width: min(100% - 32px, 1180px); }
  .brand { font-size: 18px; }
  .project-name { font-size: 16px; }
  .hero { height: 560px; }
  h1 { font-size: 31px; } h1 span { font-size: 40px; }
  .hero-message { font-size: 23px; }
  .section { padding: 58px 0; }
  h2 { font-size: 30px; }
  .zeb-card { grid-template-columns: 1fr; padding: 28px; }
  .tech-grid,.sdg-grid { grid-template-columns: 1fr; }
  .building-list div { grid-template-columns: 92px 1fr; }
  .building-list dt,.building-list dd { padding: 13px 12px; font-size: 14px; }
}