:root {
  --ink: #101a2e;
  --ink-soft: #4a5568;
  --ink-mute: #7b8494;
  --primary: #2438c2;
  --primary-dark: #1b2b99;
  --primary-pale: #eef1fc;
  --accent: #0f9d6a;
  --accent-pale: #e8f7f0;
  --bg: #ffffff;
  --bg-soft: #f5f7fc;
  --line: #e1e7f5;
  --radius: 6px;
  --radius-lg: 12px;
  --font-en: "Manrope", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo { display: flex; flex-direction: column; line-height: 1.2; }
.logo-en { font-family: var(--font-en); font-weight: 800; font-size: 22px; letter-spacing: -0.02em; color: var(--ink); }
.logo-en .dot { color: var(--primary); }
.logo-ja { font-size: 10px; color: var(--ink-mute); letter-spacing: 0.08em; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { font-size: 14px; font-weight: 500; color: var(--ink-soft); transition: color 0.2s; }
.nav a:hover { color: var(--primary); }
.nav .nav-cta {
  background: var(--primary); color: #fff; font-weight: 700;
  padding: 11px 22px; border-radius: var(--radius);
  transition: background 0.2s, transform 0.2s;
}
.nav .nav-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.menu-btn { display: none; }

/* services dropdown */
.nav-item.has-sub { position: relative; display: flex; align-items: center; height: 68px; }
.has-sub .caret { font-size: 10px; color: var(--ink-mute); }
.sub-menu {
  position: absolute; top: 100%; left: -14px; background: #fff;
  border: 1px solid var(--line); border-radius: 10px; padding: 8px; min-width: 270px;
  box-shadow: 0 14px 32px rgba(16, 26, 46, 0.12); display: none; z-index: 60;
}
.has-sub:hover .sub-menu, .has-sub:focus-within .sub-menu { display: block; }
.sub-link { display: flex; flex-direction: column; padding: 10px 12px; border-radius: 8px; }
.sub-link:hover { background: var(--primary-pale); }
.sub-label { font-weight: 700; font-size: 14px; color: var(--ink); }
.sub-note { font-size: 12px; color: var(--ink-mute); }

/* ---------- hero ---------- */
.hero { background: linear-gradient(180deg, var(--bg-soft) 0%, #ffffff 100%); overflow: hidden; }
.hero-inner {
  max-width: 1080px; margin: 0 auto; padding: 72px 24px 64px;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center;
}
.hero-en {
  font-family: var(--font-en); font-weight: 800; font-size: 64px;
  letter-spacing: -0.03em; line-height: 1.05; color: var(--ink);
  animation: fade-up 0.6s ease both;
}
.hero-en .dot { color: var(--primary); }
.hero-ja { margin-top: 20px; font-size: 20px; font-weight: 700; animation: fade-up 0.6s 0.1s ease both; }
.hero-desc { margin-top: 14px; font-size: 15px; color: var(--ink-soft); max-width: 34em; animation: fade-up 0.6s 0.2s ease both; }
.hero-actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; animation: fade-up 0.6s 0.3s ease both; }
.hero-illust { animation: fade-up 0.7s 0.25s ease both; }
.hero-note { margin-top: 14px; font-size: 12.5px; color: var(--ink-mute); }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block; font-weight: 700; font-size: 15px;
  padding: 15px 30px; border-radius: var(--radius); border: none; cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(36, 56, 194, 0.25); }
.btn-ghost { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost:hover { background: var(--primary-pale); transform: translateY(-2px); }
.btn:focus-visible, a:focus-visible { outline: 3px solid rgba(36, 56, 194, 0.5); outline-offset: 2px; }

/* ---------- sections ---------- */
.section { padding: 84px 0; }
.section.alt { background: var(--bg-soft); }
.eyebrow {
  font-family: var(--font-en); font-weight: 800; font-size: 13px;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--primary);
}
.section-title { font-size: 30px; font-weight: 700; margin-top: 8px; line-height: 1.5; }
.section-lead { margin-top: 14px; color: var(--ink-soft); font-size: 15px; max-width: 40em; }

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 40px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 26px; display: flex; flex-direction: column;
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(16, 26, 46, 0.08); }
.card-illust { height: 130px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.card-illust img { max-height: 130px; }
.card-tag {
  align-self: flex-start; font-size: 12px; font-weight: 700;
  background: var(--primary-pale); color: var(--primary);
  padding: 4px 12px; border-radius: 100px; margin-bottom: 12px;
}
.card-tag.green { background: var(--accent-pale); color: var(--accent); }
.card h3 { font-size: 19px; line-height: 1.5; }
.card .en-name { font-family: var(--font-en); font-weight: 800; font-size: 13px; letter-spacing: 0.08em; color: var(--ink-mute); margin-bottom: 4px; }
.card p { font-size: 14px; color: var(--ink-soft); margin-top: 10px; flex: 1; }
.card .price { margin-top: 16px; font-weight: 700; font-size: 15px; color: var(--primary); }
.card .card-link { margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--primary); }

/* ---------- problem list ---------- */
.problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-top: 40px; }
.problem-list { display: flex; flex-direction: column; gap: 14px; }
.problem-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 18px 22px; font-weight: 600; font-size: 15px;
  display: flex; gap: 12px; align-items: baseline;
}
.problem-item::before { content: "✓"; color: var(--primary); font-weight: 800; flex-shrink: 0; }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px; }
.step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px 20px; }
.step-num { font-family: var(--font-en); font-weight: 800; font-size: 26px; color: var(--primary); }
.step h3 { font-size: 16px; margin-top: 8px; }
.step p { font-size: 13.5px; color: var(--ink-soft); margin-top: 6px; }

/* ---------- case ---------- */
.case-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 28px;
}
.case-metric { display: flex; gap: 12px; align-items: center; margin: 18px 0; flex-wrap: wrap; }
.case-metric .before { color: var(--ink-mute); font-size: 14px; }
.case-metric .arrow { color: var(--accent); font-weight: 800; }
.case-metric .after { font-family: var(--font-en); font-weight: 800; font-size: 30px; color: var(--accent); line-height: 1; }
.case-metric .after small { font-family: inherit; font-size: 14px; font-weight: 700; }
.case-note { font-size: 12px; color: var(--ink-mute); margin-top: 20px; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--primary); color: #fff; }
.cta-band-inner { max-width: 880px; margin: 0 auto; padding: 72px 24px; text-align: center; }
.cta-band h2 { font-size: 28px; line-height: 1.6; }
.cta-band p { margin-top: 12px; font-size: 15px; opacity: 0.9; }
.cta-band .btn { margin-top: 28px; background: #fff; color: var(--primary); }
.cta-band .btn:hover { background: var(--bg-soft); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2); }

/* ---------- footer ---------- */
.footer { background: var(--bg-soft); border-top: 1px solid var(--line); padding: 56px 0 32px; }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer-nav { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-nav h4 { font-size: 13px; color: var(--ink-mute); margin-bottom: 12px; font-weight: 600; }
.footer-nav ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-nav a { font-size: 14px; color: var(--ink-soft); }
.footer-nav a:hover { color: var(--primary); }
.footer-copy { margin-top: 40px; font-size: 12px; color: var(--ink-mute); }

/* ---------- forms ---------- */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px 32px; }
.form-row { margin-bottom: 22px; }
.form-row label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 8px; }
.form-row .req { color: #d23838; font-size: 11px; margin-left: 6px; }
.form-row input[type="text"], .form-row input[type="email"], .form-row input[type="url"],
.form-row select, .form-row textarea {
  width: 100%; padding: 12px 14px; font-size: 15px; font-family: inherit;
  border: 1.5px solid var(--line); border-radius: var(--radius); background: #fff;
  color: var(--ink);
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(36, 56, 194, 0.12);
}
.radio-group { display: flex; flex-direction: column; gap: 10px; }
.radio-group label {
  display: flex; gap: 10px; align-items: center; font-weight: 500;
  border: 1.5px solid var(--line); border-radius: var(--radius);
  padding: 13px 16px; cursor: pointer; margin: 0; font-size: 14.5px;
}
.radio-group label:has(input:checked) { border-color: var(--primary); background: var(--primary-pale); }

/* diagnosis toggle */
.diag-toggle { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 36px 0; }
.diag-toggle button {
  background: #fff; border: 2px solid var(--line); border-radius: var(--radius-lg);
  padding: 24px 20px; font-family: inherit; font-size: 16px; font-weight: 700;
  color: var(--ink); cursor: pointer; transition: border-color 0.2s, background 0.2s;
  text-align: left; line-height: 1.6;
}
.diag-toggle button small { display: block; font-weight: 500; font-size: 13px; color: var(--ink-soft); }
.diag-toggle button.active { border-color: var(--primary); background: var(--primary-pale); }

/* ---------- prose (blog/about) ---------- */
.prose { max-width: 720px; }
.prose h2 { font-size: 24px; margin: 44px 0 16px; padding-left: 14px; border-left: 4px solid var(--primary); line-height: 1.5; }
.prose h3 { font-size: 19px; margin: 32px 0 12px; }
.prose p { margin-bottom: 18px; color: #2b3648; }
.prose ul, .prose ol { margin: 0 0 18px 24px; color: #2b3648; }
.prose blockquote {
  margin: 0 0 18px; padding: 16px 20px; background: var(--primary-pale);
  border-left: 4px solid var(--primary); border-radius: 0 8px 8px 0;
  color: #2b3648; font-size: 14.5px;
}
.prose li { margin-bottom: 6px; }
.page-hero { background: var(--bg-soft); padding: 40px 0 48px; }
.breadcrumbs { font-size: 12.5px; color: var(--ink-mute); margin-bottom: 22px; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumbs li { display: flex; align-items: center; gap: 6px; }
.breadcrumbs li + li::before { content: "›"; color: var(--ink-mute); }
.breadcrumbs a { color: var(--ink-soft); }
.breadcrumbs a:hover { color: var(--primary); text-decoration: underline; }
.breadcrumbs span[aria-current] { color: var(--ink-mute); }
.page-hero .eyebrow { display: block; }
.page-hero h1 { font-size: 32px; margin-top: 8px; line-height: 1.5; }
.page-hero p { margin-top: 10px; color: var(--ink-soft); font-size: 15px; }

.blog-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 40px; }
.blog-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 26px 24px; transition: transform 0.25s, box-shadow 0.25s; display: block;
}
.blog-item:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(16, 26, 46, 0.08); }
.blog-item time { font-family: var(--font-en); font-size: 12.5px; color: var(--ink-mute); font-weight: 600; }
.blog-item h3 { font-size: 17px; margin-top: 6px; line-height: 1.6; }
.blog-item p { font-size: 13.5px; color: var(--ink-soft); margin-top: 8px; }

.notice {
  background: var(--accent-pale); border: 1px solid #bfe8d6; border-radius: var(--radius);
  padding: 14px 18px; font-size: 13.5px; color: #0b6b49; margin-top: 24px;
}

.hero-2col { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 32px; align-items: center; }

.case-thumb {
  display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: 8px; margin-bottom: 16px; border: 1px solid var(--line);
}
a.card { color: inherit; }
a.card .card-link { margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--primary); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; padding: 48px 24px; gap: 32px; }
  .hero-en { font-size: 44px; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .problem-grid { grid-template-columns: 1fr; }
  .blog-list { grid-template-columns: 1fr; }
  .nav { display: none; }
  .nav.open {
    display: flex; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line); padding: 20px 24px; gap: 18px;
    align-items: stretch; max-height: calc(100vh - 68px); overflow-y: auto;
  }
  .nav-item.has-sub { height: auto; flex-direction: column; align-items: stretch; gap: 8px; }
  .sub-menu {
    display: block; position: static; box-shadow: none; border: none;
    padding: 0 0 0 14px; min-width: 0;
  }
  .menu-btn {
    display: block; background: none; border: none; cursor: pointer;
    font-size: 26px; color: var(--ink); line-height: 1; padding: 8px;
  }
  .section { padding: 60px 0; }
  .section-title { font-size: 24px; }
  .diag-toggle { grid-template-columns: 1fr; }
  .hero-2col { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .hero-en { font-size: 36px; }
  .steps { grid-template-columns: 1fr; }
}