:root {
  --navy: #071735;
  --navy-2: #0a2b5b;
  --blue: #0068ee;
  --cyan: #00c2ff;
  --gold: #ffb600;
  --ink: #10223f;
  --muted: #61708c;
  --line: rgba(151, 183, 230, 0.3);
  --soft: #f4f8ff;
  --maxw: 1180px;
  --font-jp: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-en: "Montserrat", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: var(--font-jp); line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.product-header {
  position: sticky;
  top: 0;
  z-index: 10;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.1);
  background: linear-gradient(90deg, #071735, #0a2b5b);
  box-shadow: 0 10px 28px rgba(5,16,38,.16);
}
.product-header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: min(calc(100% - 36px), var(--maxw)); min-height: 72px; margin: 0 auto; }
.product-brand { display: flex; align-items: center; gap: 12px; }
.product-brand img { width: 64px; height: 44px; object-fit: contain; }
.product-brand span { display: grid; line-height: 1.05; }
.product-brand strong { font: 700 16px var(--font-en); letter-spacing: .12em; }
.product-brand small { margin-top: 5px; font-size: 10px; font-weight: 700; letter-spacing: .28em; }
.product-header nav { display: flex; align-items: center; gap: 22px; font-size: 13px; font-weight: 800; }
.product-header nav a:hover, .product-header nav a:focus-visible { color: var(--cyan); }
.nav-contact { padding: 9px 14px; color: var(--navy); background: #fff; }

.product-hero {
  min-height: clamp(520px, 56vw, 720px);
  background: url("assets/images/work-ai-tobe-v2.png") center / cover no-repeat, var(--navy);
}
.lp-inner { width: min(calc(100% - 44px), var(--maxw)); margin: 0 auto; }
.value-band, .workflow, .features { padding: 92px 0; }
.lp-kicker { margin: 0; color: var(--blue); font: 800 12px/1.4 var(--font-en); text-transform: uppercase; }
h2 { margin: 10px 0 0; color: var(--navy); font-size: clamp(30px, 4vw, 46px); line-height: 1.28; }
.section-lead { max-width: 760px; margin: 16px 0 0; color: var(--muted); font-size: 16px; }

.value-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 38px; border: 1px solid var(--line); background: var(--line); }
.value-list article { min-height: 210px; padding: 24px; background: #fff; }
.value-list span { color: var(--gold); font: 800 12px var(--font-en); }
.value-list h3 { margin: 10px 0 0; font-size: 20px; }
.value-list p { margin: 9px 0 0; color: var(--muted); font-size: 14px; }

.workflow { color: #fff; background: linear-gradient(135deg, var(--navy), var(--navy-2)); }
.workflow-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: start; }
.workflow h2 { color: #fff; }
.workflow .section-lead { color: rgba(255,255,255,.72); }
.workflow-list { display: grid; gap: 1px; margin: 0; padding: 0; list-style: none; border: 1px solid rgba(255,255,255,.14); background: rgba(255,255,255,.14); }
.workflow-list li { display: grid; grid-template-columns: 42px 1fr; gap: 16px; padding: 20px; background: rgba(7,23,53,.92); }
.workflow-list span { display: grid; place-items: center; width: 38px; height: 38px; color: var(--navy); background: var(--cyan); font: 800 13px var(--font-en); }
.workflow-list h3 { margin: 0; font-size: 18px; }
.workflow-list p { margin: 5px 0 0; color: rgba(255,255,255,.68); font-size: 13px; }

.features { background: var(--soft); }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 36px; border: 1px solid var(--line); background: var(--line); }
.feature-grid article { min-height: 180px; padding: 28px; background: #fff; }
.feature-grid h3 { margin: 0; color: var(--navy); font-size: 21px; }
.feature-grid p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.product-contact { display: grid; grid-template-columns: 1fr auto; gap: 36px; align-items: center; width: min(calc(100% - 44px), var(--maxw)); margin: 80px auto; padding: 42px; color: #fff; background: linear-gradient(135deg, var(--blue), #009bdc); }
.product-contact h2 { color: #fff; }
.product-contact p:not(.lp-kicker) { max-width: 700px; margin: 12px 0 0; color: rgba(255,255,255,.84); }
.contact-actions { display: flex; flex-direction: column; gap: 10px; min-width: 230px; }
.primary-action { display: flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; font-size: 14px; font-weight: 900; }
.primary-action { color: var(--navy); background: #fff; }

.product-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 26px; align-items: center; min-height: 100px; padding: 22px max(22px, calc((100vw - var(--maxw)) / 2)); color: #fff; background: var(--navy); }
.product-footer a { font: 800 16px var(--font-en); letter-spacing: .08em; }
.product-footer p { margin: 0; color: rgba(255,255,255,.7); font-size: 12px; }
.product-footer small { color: rgba(255,255,255,.55); font: 700 11px var(--font-en); }

@media (max-width: 900px) {
  .product-header nav a:not(.nav-contact) { display: none; }
  .value-list { grid-template-columns: repeat(2, 1fr); }
  .workflow-inner, .product-contact { grid-template-columns: 1fr; }
  .contact-actions { flex-direction: row; min-width: 0; }
}

@media (max-width: 600px) {
  .product-header-inner { min-height: 62px; }
  .product-brand img { width: 48px; }
  .product-brand strong { font-size: 11px; }
  .product-brand small { font-size: 8px; }
  .nav-contact { padding: 7px 10px; font-size: 11px; }
  .product-hero { min-height: 0; aspect-ratio: 16 / 10; background-size: contain; }
  .value-band, .workflow, .features { padding: 66px 0; }
  .value-list, .feature-grid { grid-template-columns: 1fr; }
  .product-contact { width: min(calc(100% - 32px), var(--maxw)); margin: 48px auto; padding: 28px; }
  .contact-actions { flex-direction: column; }
  .product-footer { grid-template-columns: 1fr; gap: 8px; }
}