:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --warn: #f59e0b;
  --danger: #dc2626;
  --card: #f9fafb;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Noto Sans KR", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.95);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
}
.brand {
  font-weight: 800; font-size: 18px; letter-spacing: 0.02em;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }
.brand .badge {
  background: var(--accent-soft); color: var(--accent);
  font-size: 11px; padding: 2px 8px; border-radius: 999px;
  margin-left: 6px; vertical-align: middle; font-weight: 700;
}
.nav-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.lang-switch {
  display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden;
}
.lang-switch a {
  background: transparent; border: 0; padding: 6px 12px;
  font-size: 12px; color: var(--muted); display: inline-flex; align-items: center;
}
.lang-switch a:hover { text-decoration: none; color: var(--fg); }
.lang-switch a.active {
  background: var(--fg); color: #fff;
}
.lang-switch a.active:hover { color: #fff; }

.btn {
  display: inline-block; cursor: pointer; border: 1px solid var(--line);
  background: #fff; color: var(--fg);
  padding: 10px 16px; border-radius: var(--radius); font-weight: 600;
  font-size: 14px; transition: 0.15s;
}
.btn:hover { border-color: var(--fg); text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); text-decoration: none; }
.btn-ghost { background: transparent; }

main { max-width: 1120px; margin: 0 auto; padding: 40px 20px 80px; }

.hero { padding: 56px 0 24px; text-align: center; }
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.25; margin: 0 0 16px; font-weight: 800;
  letter-spacing: -0.01em;
}
.hero p.lead { font-size: 17px; color: var(--muted); margin: 0 auto 28px; max-width: 720px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }

.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  margin: 36px 0 8px;
}
.stat {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; text-align: center;
}
.stat .num { font-size: 26px; font-weight: 800; color: var(--fg); }
.stat .lbl { font-size: 12px; color: var(--muted); margin-top: 4px; }

section { padding: 56px 0; border-top: 1px solid var(--line); }
section h2 {
  font-size: 24px; margin: 0 0 8px; font-weight: 800;
  letter-spacing: -0.01em;
}
section .section-sub { color: var(--muted); margin: 0 0 28px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; background: #fff;
}
.step .n {
  display: inline-flex; width: 28px; height: 28px; border-radius: 999px;
  background: var(--fg); color: #fff;
  align-items: center; justify-content: center; font-weight: 700; font-size: 13px;
}
.step h3 { margin: 12px 0 6px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

.cat-group { margin-bottom: 24px; }
.cat-group h3 {
  font-size: 14px; color: var(--muted); margin: 0 0 10px;
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700;
}
.cat-list { display: flex; flex-wrap: wrap; gap: 8px; }
.cat-list .chip {
  display: inline-flex; align-items: center;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 14px; font-size: 13px; background: #fff;
}
.cat-list .chip:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); cursor: pointer; }

.tools { display: flex; flex-wrap: wrap; gap: 8px; }
.tools .tool {
  background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 6px 12px; font-size: 12px;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }

.faq details {
  border: 1px solid var(--line); border-radius: var(--radius);
  margin-bottom: 10px; padding: 14px 16px; background: #fff;
}
.faq summary { cursor: pointer; font-weight: 600; font-size: 15px; outline: none; }
.faq details[open] { background: var(--card); }
.faq .ans { color: var(--muted); margin-top: 8px; font-size: 14px; }

.compare table { width: 100%; border-collapse: collapse; font-size: 14px; }
.compare th, .compare td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
.compare th { background: var(--card); font-weight: 700; }
.compare td.yes { color: var(--accent); font-weight: 700; }

footer.site {
  border-top: 1px solid var(--line); padding: 36px 20px;
  color: var(--muted); font-size: 13px; text-align: center;
}
footer .links { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin: 10px 0; }
footer .links a { color: var(--muted); }

.alert {
  background: #fffbeb; border: 1px solid #fcd34d; color: #92400e;
  padding: 12px 14px; border-radius: var(--radius); font-size: 13px;
  margin: 24px 0; text-align: center;
}

/* === Trust strip (信頼バー：ヒーロー下の安心訴求) === */
.trust-strip {
  display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;
  margin: 28px 0 8px;
}
.trust-item {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; font-size: 13px; color: var(--fg);
}
.trust-item .ico { font-size: 16px; line-height: 1; }

/* === Ribbon (注意・告知) === */
.ribbon {
  background: linear-gradient(90deg, var(--accent-soft), #f0f9ff);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 16px 18px; margin: 24px 0;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.ribbon strong { color: var(--accent); }
.ribbon .ribbon-cta { margin-left: auto; }

/* === Waitlist form === */
.waitlist {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; margin-top: 24px;
}
.waitlist h2 { margin-top: 0; }
.waitlist .form-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.waitlist input[type="email"], .waitlist select {
  flex: 1 1 220px; min-width: 0;
  padding: 11px 14px; border: 1px solid var(--line); border-radius: var(--radius);
  font-size: 14px; background: #fff;
}
.waitlist input[type="email"]:focus, .waitlist select:focus {
  outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent);
}
.waitlist .micro { font-size: 12px; color: var(--muted); margin-top: 8px; }

/* === Use-case cards (具体的な発注事例) === */
.usecases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.usecase {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
  background: #fff;
}
.usecase .tag {
  display: inline-block; font-size: 11px; font-weight: 700; padding: 3px 8px;
  border-radius: 999px; background: var(--accent-soft); color: var(--accent);
  margin-bottom: 10px;
}
.usecase h3 { margin: 0 0 6px; font-size: 15px; }
.usecase p { margin: 0; color: var(--muted); font-size: 13px; }
.usecase .meta { margin-top: 12px; font-size: 12px; color: var(--muted); display: flex; gap: 12px; }
.usecase .meta b { color: var(--fg); font-weight: 700; }

/* === Roadmap === */
.roadmap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.roadmap-item {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
  background: #fff;
}
.roadmap-item .when {
  font-size: 11px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px;
}
.roadmap-item.now { border-color: var(--accent); }
.roadmap-item.now .when { color: var(--accent); }
.roadmap-item h3 { margin: 4px 0 6px; font-size: 15px; }
.roadmap-item p { margin: 0; color: var(--muted); font-size: 13px; }
.roadmap-item ul { margin: 6px 0 0; padding-left: 18px; color: var(--muted); font-size: 13px; }

/* === SKIMA refugee banner === */
.refugee {
  background: #fffaf0; border: 1px solid #fdba74; border-radius: var(--radius);
  padding: 20px; margin: 24px 0;
}
.refugee h3 { margin: 0 0 6px; color: #b45309; }
.refugee p { margin: 0; color: #92400e; font-size: 14px; }
.refugee a.btn { margin-top: 10px; }

/* === Legal pages === */
.legal-doc { line-height: 1.85; }
.legal-doc h2 { margin: 32px 0 10px; font-size: 18px; }
.legal-doc h2:first-child { margin-top: 0; }
.legal-doc p, .legal-doc ul { color: var(--fg); font-size: 14px; }
.legal-doc ul { padding-left: 22px; }
.legal-table table th { width: 35%; vertical-align: top; }

/* === Focus visibility (a11y) === */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:focus-visible { outline-offset: 2px; }

/* === Skip link === */
.skip-link {
  position: absolute; top: -100px; left: 8px; z-index: 100;
  background: var(--fg); color: #fff; padding: 8px 14px; border-radius: 6px;
  font-size: 13px;
}
.skip-link:focus { top: 8px; text-decoration: none; }

/* === Visually hidden (for screen readers) === */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (max-width: 720px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .brand { font-size: 16px; }
  .hero { padding: 32px 0 8px; }
  .usecases { grid-template-columns: 1fr; }
  .roadmap { grid-template-columns: 1fr; }
  .trust-strip { gap: 8px; }
  .trust-item { font-size: 12px; padding: 6px 10px; }
}