:root {
  --bg: #f6f7f6;
  --white: #ffffff;
  --ink: #14181b;
  --text-2: #3a4145;
  --text-3: #5b6368;
  --text-4: #9aa2a6;
  --line: #d9ddde;
  --field: #c3c9cb;
  --grid: #e6e9ea;
  --accent: #1f5fa8;
  --accent-hover: #164a85;
  --accent-soft: #e8eff7;
  --accent-on-dark: #8fb4de;
  --on-dark: #cfd4d6;
  --on-dark-line: #3a4145;
  --placeholder: #e0a860;
  --sans: "IBM Plex Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --pad: 120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, p { margin: 0; }
:lang(zh-Hant-TW) { --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif; }
:lang(ja) { --sans: "IBM Plex Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif; }
p, h2 { text-wrap: pretty; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
.mono { font-family: var(--mono); }
.wrap { max-width: 1440px; margin: 0 auto; padding-left: var(--pad); padding-right: var(--pad); }
.grid-bg {
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 40px 40px;
}
.sec-head { display: flex; align-items: baseline; gap: 24px; }
.sec-num { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.sec-title { font-size: 36px; font-weight: 700; line-height: 1.4; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  min-height: 56px; padding: 0 28px;
  font: inherit; font-size: 16px; font-weight: 700;
  text-decoration: none; cursor: pointer; border: 0;
  transition: background-color .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-outline { background: transparent; color: var(--ink); border: 1px solid var(--ink); font-weight: 400; font-size: 15px; padding: 0 24px; }
.btn-outline:hover { background: var(--white); color: var(--ink); }
.btn svg { flex-shrink: 0; }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(246, 247, 246, .94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: baseline; gap: 14px; color: var(--ink); text-decoration: none; }
.brand:hover { color: var(--ink); }
.brand-name { font-size: 22px; font-weight: 700; letter-spacing: .02em; }
.brand-sub { font-family: var(--mono); font-size: 12px; color: var(--text-3); }
.nav { display: flex; align-items: center; gap: 36px; font-size: 14px; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--accent); }
.nav .nav-cta { display: inline-flex; align-items: center; height: 40px; padding: 0 20px; background: var(--ink); color: var(--bg); font-weight: 500; }
.nav .nav-cta:hover { background: var(--accent); color: #fff; }
.nav .lang-link { display: inline-flex; align-items: center; gap: 6px; color: var(--text-3); }
.nav .lang-link:hover { color: var(--accent); }
.footer-lang { color: var(--on-dark); font-size: 13px; }
.menu-btn { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; background: none; border: 0; color: var(--ink); cursor: pointer; }

/* hero */
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: center; padding-top: 96px; padding-bottom: 88px; }
.hero-copy { display: flex; flex-direction: column; gap: 32px; }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: .08em; }
.hero h1 { font-size: 60px; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
.hero-lead { font-size: 18px; line-height: 1.9; color: var(--text-2); max-width: 540px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.nda { display: flex; align-items: flex-start; gap: 10px; font-size: 13px; line-height: 1.7; color: var(--text-3); }
.nda svg { flex-shrink: 0; margin-top: 3px; }
.hero-map { border: 1px solid var(--line); width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }

/* numbers */
.numbers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.num { display: flex; flex-direction: column; gap: 8px; padding: 32px 0 32px 40px; border-left: 1px solid var(--line); }
.num:first-child { padding-left: 0; border-left: 0; }
.num-label { font-family: var(--mono); font-size: 12px; color: var(--text-3); }
.num-value { font-size: 44px; font-weight: 700; line-height: 1.2; }
.num-value small { font-size: 20px; margin-left: 4px; }
.num-desc { font-size: 14px; color: var(--text-2); }

/* problems */
.problems .wrap { display: flex; flex-direction: column; gap: 48px; padding-top: 120px; padding-bottom: 104px; }
.cards-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.problem { display: flex; flex-direction: column; gap: 20px; padding: 32px; background: var(--white); border: 1px solid var(--line); }
.problem p { font-size: 19px; line-height: 1.7; font-weight: 500; }

/* about */
.about { background: var(--ink); color: var(--bg); }
.about .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 80px; padding-top: 104px; padding-bottom: 104px; }
.about-head { display: flex; flex-direction: column; gap: 24px; }
.about h2 { font-size: 40px; line-height: 1.45; font-weight: 700; }
.about-body { display: flex; flex-direction: column; gap: 24px; font-size: 17px; line-height: 2; color: var(--on-dark); }

/* strengths */
.strengths .wrap { display: flex; flex-direction: column; gap: 56px; padding-top: 120px; padding-bottom: 120px; }
.strength-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.strength { display: flex; flex-direction: column; gap: 20px; padding: 36px 36px 0; border-left: 1px solid var(--line); }
.strength:first-child { padding-left: 0; border-left: 0; }
.strength:last-child { padding-right: 0; }
.strength-num { font-family: var(--mono); font-size: 44px; color: var(--accent); line-height: 1; }
.strength h3 { font-size: 24px; font-weight: 700; }
.strength p { font-size: 16px; line-height: 1.9; color: var(--text-2); }
.diff { display: flex; gap: 40px; align-items: center; padding: 32px 40px; background: var(--accent-soft); }
.diff-label { flex-shrink: 0; font-size: 15px; font-weight: 700; color: var(--accent); }
.diff p { font-size: 16px; line-height: 1.8; }

/* cases */
.cases { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cases .wrap { display: flex; flex-direction: column; gap: 48px; padding-top: 104px; padding-bottom: 104px; }
.case { display: grid; grid-template-columns: 300px 56px 300px minmax(0, 1fr); align-items: center; gap: 24px; padding: 28px 0; border-top: 1px solid var(--line); }
.case:last-child { border-bottom: 1px solid var(--line); }
.case-party { font-size: 18px; font-weight: 700; }
.case p { font-size: 16px; color: var(--text-2); line-height: 1.7; }

/* flow */
.flow .wrap { display: flex; flex-direction: column; gap: 56px; padding-top: 120px; padding-bottom: 120px; }
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; list-style: none; margin: 0; padding: 0; }
.step { display: flex; flex-direction: column; gap: 14px; padding-top: 20px; border-top: 3px solid var(--accent); }
.step-num { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.step h3 { font-size: 20px; font-weight: 700; }
.step p { font-size: 14px; line-height: 1.8; color: var(--text-2); }

/* pricing */
.pricing .wrap { display: flex; flex-direction: column; gap: 48px; padding-bottom: 120px; }
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.plan { display: flex; flex-direction: column; gap: 20px; padding: 40px; background: var(--white); border: 1px solid var(--line); }
.plan-tag { font-family: var(--mono); font-size: 13px; color: var(--text-3); }
.plan h3 { font-size: 28px; font-weight: 700; }
.plan p { font-size: 16px; line-height: 1.8; color: var(--text-2); flex-grow: 1; }
.plan-price { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding-top: 20px; border-top: 1px solid var(--line); }
.plan-price span:first-child { font-size: 14px; color: var(--text-3); }
.plan-price span:last-child { font-size: 20px; font-weight: 700; }
.plan-dark { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.plan-dark .plan-tag { color: var(--accent-on-dark); }
.plan-dark p { color: var(--on-dark); }
.plan-dark .plan-price { border-top-color: var(--on-dark-line); }
.plan-dark .plan-price span:first-child { color: var(--text-4); }

/* faq */
.faq { background: var(--white); border-top: 1px solid var(--line); }
.faq .wrap { display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: 80px; padding-top: 104px; padding-bottom: 104px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 26px 0; font-size: 18px; font-weight: 700; cursor: pointer; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary svg { flex-shrink: 0; transition: transform .2s; color: var(--accent); }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details p { padding: 0 0 26px; font-size: 15px; line-height: 1.9; color: var(--text-2); }

/* contact */
.contact .wrap { display: grid; grid-template-columns: 400px minmax(0, 1fr); gap: 80px; padding-top: 120px; padding-bottom: 120px; }
.contact-head { display: flex; flex-direction: column; gap: 24px; }
.contact-head h2 { font-size: 36px; line-height: 1.5; font-weight: 700; }
.contact-head p { font-size: 15px; line-height: 1.9; color: var(--text-2); }
.placeholder { color: var(--placeholder); font-weight: 700; }
.form { display: flex; flex-direction: column; gap: 20px; padding: 48px; background: var(--white); border: 1px solid var(--line); }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 14px; font-weight: 500; }
.req, .opt { font-size: 12px; margin-left: 6px; }
.req { color: var(--accent); }
.opt { color: var(--text-3); }
.field input, .field textarea {
  width: 100%; min-height: 48px; padding: 12px 14px;
  font: inherit; font-size: 16px; color: var(--ink);
  background: var(--white); border: 1px solid var(--field); border-radius: 0;
}
.field textarea { min-height: 96px; resize: vertical; line-height: 1.7; }
.field input::placeholder, .field textarea::placeholder { color: var(--text-4); }
.field input:focus, .field textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.form .btn { width: 100%; min-height: 60px; margin-top: 8px; }
.form-note { font-size: 12px; line-height: 1.7; color: var(--text-3); }

/* footer */
.site-footer { background: var(--ink); color: var(--on-dark); }
.site-footer .wrap { display: flex; flex-direction: column; gap: 48px; padding-top: 72px; padding-bottom: 40px; }
.footer-grid { display: grid; grid-template-columns: 360px repeat(3, minmax(0, 1fr)); gap: 40px; }
.footer-brand { display: flex; flex-direction: column; gap: 12px; }
.footer-brand .brand-name { color: var(--bg); }
.footer-brand .mono { font-size: 12px; color: var(--text-4); }
.footer-brand a { color: var(--on-dark); font-size: 14px; margin-top: 8px; }
.office { display: flex; flex-direction: column; gap: 8px; font-size: 13px; line-height: 1.8; font-style: normal; }
.office .mono { font-size: 12px; color: var(--accent-on-dark); }
.office .placeholder { color: var(--placeholder); font-weight: 400; }
.copyright { padding-top: 24px; border-top: 1px solid #2c3236; font-size: 12px; color: #7c8488; }

/* ---------- tablet ---------- */
@media (max-width: 1180px) {
  :root { --pad: 48px; }
  .hero h1 { font-size: 48px; }
  .case { grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr); }
  .case p { grid-column: 1 / -1; }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 32px; }
  .faq .wrap, .contact .wrap { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- mobile ---------- */
@media (max-width: 860px) {
  :root { --pad: 20px; }
  .grid-bg { background-size: 28px 28px; }
  .sec-head { flex-direction: column; gap: 8px; }
  .sec-num { font-size: 12px; }
  .sec-title { font-size: 24px; }

  .site-header .wrap { height: 60px; }
  .brand { flex-direction: column; gap: 2px; }
  .brand-name { font-size: 18px; }
  .brand-sub { font-size: 10px; }
  .menu-btn { display: inline-flex; }
  .nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px 20px 20px; background: var(--bg); border-bottom: 1px solid var(--line);
  }
  .nav.open { display: flex; }
  .nav a { display: flex; align-items: center; min-height: 48px; border-bottom: 1px solid var(--line); font-size: 15px; }
  .nav .lang-link { display: flex; }
  .nav .nav-cta { justify-content: center; height: 52px; margin-top: 16px; border-bottom: 0; order: 1; }

  .hero .wrap { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-top: 40px; padding-bottom: 36px; }
  .hero-copy { display: contents; }
  .eyebrow { font-size: 11px; order: 1; }
  .hero h1 { font-size: 34px; line-height: 1.35; order: 2; }
  .hero-lead { font-size: 15px; order: 3; }
  .hero-visual { order: 4; }
  .hero-actions { order: 5; flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-actions .btn-outline { display: none; }
  .nda { font-size: 12px; order: 6; }

  .num { gap: 4px; padding: 18px 0 18px 12px; }
  .num-label { display: none; }
  .num-value { font-size: 26px; }
  .num-value small { font-size: 13px; margin-left: 0; }
  .num-desc { font-size: 11px; line-height: 1.5; }

  .problems .wrap { gap: 24px; padding-top: 64px; padding-bottom: 56px; }
  .cards-3 { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .problem { flex-direction: row; align-items: flex-start; gap: 16px; padding: 20px; }
  .problem svg { width: 24px; height: 24px; flex-shrink: 0; }
  .problem p { font-size: 15px; }

  .about .wrap { grid-template-columns: minmax(0, 1fr); gap: 20px; padding-top: 56px; padding-bottom: 56px; }
  .about h2 { font-size: 26px; line-height: 1.5; }
  .about-body { font-size: 15px; line-height: 1.95; gap: 20px; }

  .strengths .wrap { gap: 24px; padding-top: 64px; padding-bottom: 64px; }
  .strength-list { grid-template-columns: minmax(0, 1fr); }
  .strength, .strength:first-child, .strength:last-child { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 14px; row-gap: 10px; align-items: baseline; padding: 24px 0; border-left: 0; border-top: 1px solid var(--line); }
  .strength:first-child { border-top: 0; }
  .strength-num { font-size: 24px; }
  .strength h3 { font-size: 19px; }
  .strength p { grid-column: 1 / -1; font-size: 14px; }
  .diff { flex-direction: column; align-items: flex-start; gap: 8px; padding: 20px; }
  .diff-label { font-size: 14px; }
  .diff p { font-size: 14px; }

  .cases .wrap { gap: 24px; padding-top: 56px; padding-bottom: 56px; }
  .case { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; padding: 20px 0; }
  .case-party { font-size: 15px; }
  .case svg { width: 28px; }
  .case p { flex-basis: 100%; font-size: 14px; }

  .flow .wrap { gap: 24px; padding-top: 64px; padding-bottom: 64px; }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 0; margin-left: 6px; border-left: 2px solid var(--accent); }
  .step { gap: 4px; padding: 0 0 22px 20px; border-top: 0; }
  .step:last-child { padding-bottom: 0; }
  .step-num { font-size: 11px; }
  .step h3 { font-size: 17px; }
  .step p { font-size: 13px; line-height: 1.7; }

  .pricing .wrap { gap: 20px; padding-bottom: 64px; }
  .plans { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .plan { gap: 14px; padding: 24px; }
  .plan-tag { font-size: 11px; }
  .plan h3 { font-size: 22px; }
  .plan p { font-size: 14px; }
  .plan-price { padding-top: 14px; }
  .plan-price span:first-child { font-size: 13px; }
  .plan-price span:last-child { font-size: 16px; }

  .faq .wrap { gap: 20px; padding-top: 56px; padding-bottom: 56px; }
  .faq summary { padding: 20px 0; font-size: 16px; }
  .faq details p { padding-bottom: 20px; font-size: 14px; line-height: 1.85; }

  .contact .wrap { gap: 24px; padding-top: 64px; padding-bottom: 64px; }
  .contact-head { gap: 12px; }
  .contact-head h2 { font-size: 24px; }
  .contact-head p { font-size: 13px; line-height: 1.8; }
  .form { gap: 16px; padding: 20px; }
  .form-row { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .field label { font-size: 13px; }
  .form .btn { min-height: 56px; }

  .site-footer .wrap { gap: 24px; padding-top: 48px; padding-bottom: 32px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .office { font-size: 12px; gap: 4px; }
  .office br.pc { display: none; }
  .copyright { padding-top: 18px; font-size: 11px; }
}

/* 問い合わせフォームの送信結果 */
.form-gotcha { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status { margin-top: 16px; padding: 14px 18px; border-radius: 6px; font-size: 14px; line-height: 1.8; }
.form-status[data-state="sending"] { background: var(--accent-soft); color: var(--accent-hover); }
.form-status[data-state="ok"] { background: var(--accent-soft); color: var(--accent-hover); font-weight: 500; }
.form-status[data-state="ng"] { background: #fdecea; color: #a33223; }