:root {
  --ink: #09243a;
  --ink-2: #143c57;
  --night: #061724;
  --blue: #1e78a8;
  --blue-soft: #e9f5fb;
  --paper: #f7f9fa;
  --white: #fff;
  --gold: #e7af4c;
  --gold-soft: #f5d28d;
  --line: rgba(9, 36, 58, .14);
  --muted: #617382;
  --shadow: 0 24px 70px rgba(5, 25, 39, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input, textarea { font: inherit; }
img { display: block; max-width: 100%; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 999; padding: .7rem 1rem; background: #fff; color: var(--ink); }
.skip-link:focus { top: 1rem; }
.container { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.16);
  transition: background .25s ease, color .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled { color: var(--ink); background: rgba(255,255,255,.94); box-shadow: 0 8px 30px rgba(5,25,39,.08); backdrop-filter: blur(16px); }
.header-inner { min-height: 82px; display: flex; align-items: center; gap: 36px; }
.brand { display: inline-flex; flex-direction: column; text-decoration: none; line-height: 1.1; letter-spacing: .18em; white-space: nowrap; }
.brand strong { font: 800 1.05rem/1 "Zen Kaku Gothic New", sans-serif; }
.brand small { margin-top: 8px; font-size: .63rem; letter-spacing: .13em; opacity: .74; }
.site-nav { margin-left: auto; display: flex; align-items: center; gap: 28px; font-size: .83rem; font-weight: 700; }
.site-nav a { text-decoration: none; position: relative; }
.site-nav a:not(.header-cta)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 1px; background: currentColor; transition: right .2s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.header-cta { padding: 11px 18px; border-radius: 999px; color: #17283a; background: var(--gold-soft); }
.menu-button { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid currentColor; border-radius: 50%; background: transparent; color: inherit; }
.menu-button span, .menu-button::before, .menu-button::after { content: ""; display: block; width: 18px; height: 1px; margin: 5px auto; background: currentColor; }

.hero {
  position: relative;
  min-height: 760px;
  display: grid;
  align-items: end;
  color: #fff;
  background: var(--night) url("rain-ai-website-hero.jpg") center / cover no-repeat;
  overflow: hidden;
}
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(2,15,25,.94) 0%, rgba(5,28,45,.84) 37%, rgba(6,23,36,.24) 67%, rgba(5,17,26,.18) 100%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 36%; background: linear-gradient(transparent, rgba(3,14,22,.76)); }
.rain-field { position: absolute; inset: 0; opacity: .2; background-image: repeating-linear-gradient(104deg, transparent 0 46px, rgba(255,255,255,.24) 47px, transparent 48px 95px); transform: translateX(-8%); }
.hero-inner { position: relative; z-index: 2; padding: 170px 0 90px; }
.hero-copy { max-width: 820px; }
.kicker { display: inline-flex; align-items: center; gap: 12px; margin: 0 0 20px; color: var(--gold-soft); font: 600 .76rem/1.4 "JetBrains Mono", monospace; letter-spacing: .17em; text-transform: uppercase; }
.kicker::before { content: ""; width: 38px; height: 1px; background: currentColor; }
.hero h1 { margin: 0; font: 800 clamp(3rem, 5.8vw, 5.8rem)/1.03 "Zen Kaku Gothic New", sans-serif; letter-spacing: -.045em; text-wrap: balance; }
.hero h1 span { color: var(--gold-soft); }
@media (min-width: 641px) { .hero h1 span { white-space: nowrap; } }
.hero-lead { max-width: 690px; margin: 28px 0 0; font-size: clamp(1rem, 1.4vw, 1.2rem); color: rgba(255,255,255,.86); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; min-height: 54px; align-items: center; justify-content: center; gap: 12px; padding: 0 24px; border: 1px solid transparent; border-radius: 3px; text-decoration: none; font-weight: 700; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #142535; background: var(--gold-soft); }
.button-ghost { color: #fff; border-color: rgba(255,255,255,.48); background: rgba(7,22,33,.22); backdrop-filter: blur(8px); }
.button-dark { color: #fff; background: var(--ink); }
.hero-meta { display: flex; gap: 34px; margin-top: 58px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.24); color: rgba(255,255,255,.7); font: 500 .72rem/1.6 "JetBrains Mono", monospace; letter-spacing: .1em; }

.intro-strip { background: var(--night); color: #fff; }
.intro-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; align-items: center; padding: 56px 0; }
.intro-label { color: var(--gold-soft); font: 600 .72rem/1.5 "JetBrains Mono", monospace; letter-spacing: .18em; }
.intro-grid p { margin: 0; font-size: clamp(1.12rem, 2vw, 1.6rem); font-weight: 700; line-height: 1.75; }

.section { padding: 112px 0; }
.section-soft { background: var(--paper); }
.section-dark { color: #fff; background: var(--night); }
.section-head { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; margin-bottom: 58px; }
.eyebrow { color: var(--blue); font: 700 .72rem/1.5 "JetBrains Mono", monospace; letter-spacing: .18em; text-transform: uppercase; }
.section-dark .eyebrow { color: var(--gold-soft); }
.section-title { margin: 10px 0 0; font: 800 clamp(2rem, 4.2vw, 4.25rem)/1.13 "Zen Kaku Gothic New", sans-serif; letter-spacing: -.035em; text-wrap: balance; }
.section-summary { align-self: end; margin: 0; color: var(--muted); font-size: 1.03rem; }
.section-dark .section-summary { color: rgba(255,255,255,.7); }

.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.problem-card { padding: 30px 30px 16px 0; border-right: 1px solid var(--line); }
.problem-card + .problem-card { padding-left: 30px; }
.problem-card:last-child { border-right: 0; }
.index { display: block; margin-bottom: 28px; color: var(--blue); font: 600 .7rem/1 "JetBrains Mono", monospace; }
.problem-card h3 { margin: 0 0 12px; font-size: 1.16rem; }
.problem-card p { margin: 0; color: var(--muted); font-size: .94rem; }

.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.service-card { position: relative; min-height: 430px; padding: 34px; border: 1px solid var(--line); background: #fff; overflow: hidden; }
.service-card::after { content: ""; position: absolute; width: 170px; height: 170px; right: -70px; bottom: -80px; border: 1px solid rgba(30,120,168,.18); border-radius: 50%; box-shadow: 0 0 0 34px rgba(30,120,168,.04), 0 0 0 68px rgba(30,120,168,.025); }
.service-card.featured { color: #fff; background: var(--ink); border-color: var(--ink); }
.service-type { color: var(--blue); font: 700 .7rem/1.5 "JetBrains Mono", monospace; letter-spacing: .13em; }
.featured .service-type { color: var(--gold-soft); }
.service-card h3 { margin: 28px 0 18px; font: 800 1.7rem/1.35 "Zen Kaku Gothic New", sans-serif; }
.service-card p { margin: 0; color: var(--muted); font-size: .93rem; }
.featured p { color: rgba(255,255,255,.72); }
.feature-list { list-style: none; margin: 26px 0 0; padding: 0; font-size: .85rem; }
.feature-list li { padding: 10px 0; border-top: 1px solid var(--line); }
.featured .feature-list li { border-color: rgba(255,255,255,.13); }
.service-link { position: absolute; z-index: 2; left: 34px; bottom: 28px; text-decoration: none; font-weight: 700; font-size: .85rem; }

.flow-shell { display: grid; grid-template-columns: 1.05fr .95fr; gap: 72px; align-items: center; }
.flow-visual { position: relative; min-height: 620px; background: url("growing-homepage/site-update-hero.jpg") center / cover no-repeat; box-shadow: var(--shadow); }
.flow-visual::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(4,22,35,.05), rgba(4,22,35,.7)); }
.flow-caption { position: absolute; z-index: 2; inset: auto 28px 28px; padding: 22px; color: #fff; background: rgba(5,21,33,.78); backdrop-filter: blur(12px); }
.flow-caption strong { display: block; font-size: 1.05rem; }
.flow-caption span { font-size: .82rem; color: rgba(255,255,255,.68); }
.flow-copy h2 { margin: 10px 0 22px; font: 800 clamp(2rem, 4vw, 3.8rem)/1.15 "Zen Kaku Gothic New", sans-serif; letter-spacing: -.035em; }
.flow-copy > p { color: var(--muted); }
.flow-list { list-style: none; counter-reset: flow; margin: 38px 0 0; padding: 0; }
.flow-list li { counter-increment: flow; position: relative; padding: 18px 0 18px 62px; border-top: 1px solid var(--line); }
.flow-list li::before { content: "0" counter(flow); position: absolute; left: 0; top: 20px; color: var(--blue); font: 600 .7rem/1 "JetBrains Mono", monospace; }
.flow-list strong { display: block; margin-bottom: 3px; }
.flow-list span { color: var(--muted); font-size: .88rem; }
.status-note { display: inline-flex; margin-top: 28px; padding: 8px 13px; color: var(--ink-2); background: var(--blue-soft); font-size: .75rem; font-weight: 700; }

.architecture-grid { display: grid; grid-template-columns: 1fr 90px 1.15fr; gap: 0; align-items: stretch; margin-bottom: 22px; }
.architecture-card { padding: clamp(26px, 4vw, 46px); border: 1px solid rgba(255,255,255,.18); }
.architecture-legacy { color: rgba(255,255,255,.78); background: rgba(255,255,255,.035); }
.architecture-next { position: relative; color: #071c2b; background: linear-gradient(135deg, #f6fbff, #cfe9f5); border-color: transparent; box-shadow: 0 22px 60px rgba(0,0,0,.22); }
.architecture-next::after { content: "AI READY"; position: absolute; top: 0; right: 0; padding: 9px 13px; color: #071c2b; background: var(--gold-soft); font: 700 .62rem/1 "JetBrains Mono", monospace; letter-spacing: .12em; }
.architecture-label { display: block; margin-bottom: 32px; color: var(--gold-soft); font: 600 .67rem/1.4 "JetBrains Mono", monospace; letter-spacing: .12em; }
.architecture-next .architecture-label { color: var(--blue); }
.architecture-card h3 { margin: 0 0 16px; font: 800 clamp(1.5rem, 2.4vw, 2.35rem)/1.25 "Zen Kaku Gothic New", sans-serif; }
.architecture-card p { margin: 0 0 26px; font-size: .88rem; }
.architecture-legacy p { color: rgba(255,255,255,.58); }
.architecture-card ul { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.architecture-card li { position: relative; padding-left: 19px; font-size: .82rem; }
.architecture-card li::before { content: "—"; position: absolute; left: 0; color: var(--gold-soft); }
.architecture-next li::before { color: var(--blue); }
.architecture-shift { display: grid; place-content: center; justify-items: center; color: var(--gold-soft); }
.architecture-shift span { font: 600 .58rem/1 "JetBrains Mono", monospace; letter-spacing: .12em; writing-mode: vertical-rl; }
.architecture-shift strong { margin-top: 14px; font-size: 1.7rem; }
.architecture-note { margin: 0 0 50px; color: rgba(255,255,255,.52); font-size: .76rem; }
.standard-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid rgba(255,255,255,.18); }
.standard-item { min-height: 250px; padding: 34px 24px 34px 0; border-right: 1px solid rgba(255,255,255,.18); }
.standard-item + .standard-item { padding-left: 24px; }
.standard-item:last-child { border-right: 0; }
.standard-item .num { color: var(--gold-soft); font: 600 .68rem/1 "JetBrains Mono", monospace; }
.standard-item h3 { margin: 54px 0 12px; font-size: 1.14rem; }
.standard-item p { margin: 0; color: rgba(255,255,255,.62); font-size: .85rem; }

.works-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.work-card { min-height: 520px; display: flex; flex-direction: column; overflow: hidden; color: inherit; text-decoration: none; border: 1px solid var(--line); background: #fff; transition: transform .2s ease, box-shadow .2s ease; }
.work-card:hover { transform: translateY(-4px); box-shadow: 0 16px 45px rgba(5,25,39,.1); }
.work-media { display: block; height: 280px; overflow: hidden; background: #e8eef2; border-bottom: 1px solid var(--line); }
.work-media img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: top center; transition: transform .45s ease; }
.work-card:hover .work-media img { transform: scale(1.025); }
.work-media-contain { background: linear-gradient(135deg, #eaf1f5, #f8fafb); }
.work-media-contain img { object-fit: contain; padding: 18px; }
.work-media-line { background: linear-gradient(135deg, #dff4e8, #f7faf8); }
.work-media-fengshui { background: linear-gradient(135deg, #e6edf5, #f8f5ed); }
.work-media-ouchifusui { background: linear-gradient(135deg, #dff4e8, #e8f0f7); }
.work-body { flex: 1; display: flex; flex-direction: column; padding: 28px 30px 30px; }
.work-tag { color: var(--blue); font: 600 .67rem/1.5 "JetBrains Mono", monospace; letter-spacing: .11em; }
.work-card h3 { margin: 20px 0 12px; font: 800 1.55rem/1.3 "Zen Kaku Gothic New", sans-serif; }
.work-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.work-card .arrow { margin-top: auto; font-weight: 700; }
.product-index { margin-top: 20px; padding: 26px 30px 30px; color: #fff; background: var(--ink); }
.product-index-head { display: flex; justify-content: space-between; gap: 20px; align-items: baseline; padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.18); }
.product-index-head span { color: var(--gold-soft); font: 600 .65rem/1 "JetBrains Mono", monospace; letter-spacing: .12em; }
.product-index-head strong { font-size: .83rem; }
.product-links { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 18px; }
.product-links a, .product-links span { padding: 10px 12px 10px 0; color: rgba(255,255,255,.76); font-size: .78rem; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,.1); }
.product-links a:hover { color: #fff; }
.works-foot { display: flex; justify-content: space-between; gap: 24px; align-items: center; margin-top: 28px; color: var(--muted); font-size: .88rem; }
.text-link { color: var(--ink); font-weight: 700; text-underline-offset: 5px; }

.story { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; }
.story-mark { padding: 32px 0; border-block: 1px solid var(--line); }
.story-mark strong { display: block; font: 800 2rem/1.2 "Zen Kaku Gothic New", sans-serif; }
.story-mark span { color: var(--muted); font-size: .85rem; }
.story-copy blockquote { margin: 0; font: 700 clamp(1.5rem, 2.5vw, 2.4rem)/1.6 "Zen Kaku Gothic New", sans-serif; }
.story-copy p { color: var(--muted); }

.faq-list { max-width: 860px; margin-left: auto; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 20px; padding: 24px 0; font-weight: 700; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary span { flex: 0 0 auto; color: var(--blue); }
.faq-item p { margin: -4px 44px 24px 0; color: var(--muted); }

.contact { padding: 110px 0; color: #fff; background: linear-gradient(115deg, #0a2a42, #154e6c); }
.contact-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 60px; align-items: end; }
.contact h2 { margin: 10px 0 20px; font: 800 clamp(2.3rem, 5vw, 5rem)/1.08 "Zen Kaku Gothic New", sans-serif; letter-spacing: -.04em; }
.contact p { max-width: 700px; color: rgba(255,255,255,.72); }
.contact-actions { display: flex; flex-direction: column; align-items: stretch; gap: 12px; }
.contact-actions .button { width: 100%; }
.mail-address { text-align: center; font-size: .76rem; color: rgba(255,255,255,.56); }

.site-footer { padding: 54px 0; color: rgba(255,255,255,.66); background: #04101a; font-size: .78rem; }
.footer-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; }
.footer-brand { color: #fff; font: 800 1rem/1.4 "Zen Kaku Gothic New", sans-serif; letter-spacing: .15em; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-bottom: 20px; }
.footer-links a { text-underline-offset: 4px; }

@media (max-width: 980px) {
  .site-nav { position: fixed; inset: 82px 0 auto; display: none; margin: 0; padding: 24px; flex-direction: column; align-items: stretch; gap: 0; color: var(--ink); background: #fff; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 14px 4px; border-bottom: 1px solid var(--line); }
  .site-nav .header-cta { margin-top: 14px; text-align: center; border-bottom: 0; }
  .menu-button { display: block; }
  .section-head, .intro-grid, .flow-shell, .story, .contact-grid, .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .problem-grid, .service-grid, .works-grid { grid-template-columns: 1fr; }
  .problem-card, .problem-card + .problem-card { padding: 26px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .service-card { min-height: 390px; }
  .flow-visual { min-height: 540px; }
  .architecture-grid { grid-template-columns: 1fr; }
  .architecture-shift { min-height: 72px; }
  .architecture-shift span { writing-mode: initial; }
  .architecture-shift strong { margin: 3px 0 0; transform: rotate(90deg); }
  .standard-grid { grid-template-columns: repeat(2, 1fr); }
  .standard-item:nth-child(2) { border-right: 0; }
  .standard-item:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.18); }
  .works-foot { align-items: flex-start; flex-direction: column; }
  .product-links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .container { width: min(100% - 32px, 1180px); }
  .header-inner { min-height: 72px; }
  .site-nav { top: 72px; }
  .brand small { display: none; }
  .hero { min-height: 720px; background-position: 62% center; }
  .hero::before { background: linear-gradient(90deg, rgba(2,15,25,.94), rgba(4,22,35,.66)), linear-gradient(0deg, rgba(2,15,25,.52), transparent); }
  .hero-inner { padding: 132px 0 58px; }
  .hero h1 { font-size: clamp(2.7rem, 13vw, 4.4rem); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-meta { gap: 12px; flex-direction: column; margin-top: 36px; }
  .section { padding: 80px 0; }
  .section-head { margin-bottom: 38px; }
  .service-card { min-height: 410px; padding: 28px; }
  .service-link { left: 28px; }
  .flow-visual { min-height: 420px; }
  .architecture-card { padding: 26px 22px; }
  .architecture-next::after { font-size: .56rem; }
  .architecture-note { margin-bottom: 36px; }
  .standard-grid { grid-template-columns: 1fr; }
  .standard-item, .standard-item + .standard-item { min-height: auto; padding: 28px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); }
  .standard-item h3 { margin-top: 28px; }
  .work-card { min-height: 500px; }
  .work-media { height: 240px; }
  .work-body { padding: 24px; }
  .product-index { padding: 24px 20px; }
  .product-index-head { align-items: flex-start; flex-direction: column; }
  .product-links { grid-template-columns: 1fr; }
  .contact { padding: 82px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}