:root {
  --text: #1B2622;
  --body: #37433E;
  --sub: #55615C;
  --line: #D9DFDB;
  --line-soft: #E8ECE9;
  --alt: #F4F6F4;
  --tint: #E7F0EB;
  --field: #76827C;
  --accent: #1F4D3F;
  --accent-hover: #173A30;
  --danger: #8A2C2C;
  --white: #FFFFFF;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Noto Sans CJK JP', sans-serif;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  background: var(--white);
}

h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }
p, dd, li { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
ul, ol { padding: 0; list-style: none; }
a { color: var(--text); }
a:hover { color: var(--sub); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[id] { scroll-margin-top: 24px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; padding: 8px 16px; background: var(--white); }

.container { max-width: 1168px; margin: 0 auto; padding: 0 24px; }
.stack-lg { display: flex; flex-direction: column; gap: 56px; }
.stack-md { display: flex; flex-direction: column; gap: 48px; }
.stack-sm { display: flex; flex-direction: column; gap: 40px; }

.label { font-size: 13px; font-weight: 500; letter-spacing: 0.1em; color: var(--accent); }
.accent { color: var(--accent); }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 32px; padding-top: 18px; padding-bottom: 18px; }
.wordmark { font-size: 22px; font-weight: 700; letter-spacing: 0.04em; line-height: 1.2; color: var(--text); text-decoration: none; }
.wordmark--small { font-size: 16px; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 32px; }
.nav__link { color: var(--text); text-decoration: none; font-size: 14px; padding: 10px 0; }

/* Buttons */
.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 56px; padding: 0 32px; border: 0; border-radius: 4px; background: var(--accent); color: var(--white); font: inherit; font-size: 16px; font-weight: 500; text-decoration: none; cursor: pointer; }
.button:hover { background: var(--accent-hover); color: var(--white); }
.button--small { min-height: 44px; padding: 0 20px; font-size: 14px; }
.button--block { width: 100%; min-height: 52px; }
.button[disabled] { opacity: 0.6; cursor: progress; }

/* Hero */
.hero { display: flex; flex-wrap: wrap; align-items: center; gap: 56px 72px; padding-top: 96px; padding-bottom: 104px; }
.hero__copy { flex: 1 1 560px; min-width: 0; display: flex; flex-direction: column; gap: 28px; }
.hero__copy .label { font-size: 14px; letter-spacing: 0.08em; }
.hero__title { font-size: clamp(32px, 3.9vw, 50px); line-height: 1.5; font-weight: 700; letter-spacing: 0.02em; }
.hero__title span, .contact__title span { display: inline-block; }
.hero__lead { max-width: 600px; font-size: 16.5px; line-height: 2; color: var(--body); }
.hero__actions { margin-top: 8px; }

.sample { flex: 0 1 400px; min-width: 0; border: 1px solid var(--line); border-radius: 6px; background: var(--white); overflow: hidden; }
.sample__head { padding: 14px 20px; border-bottom: 1px solid var(--line); background: var(--alt); font-size: 13px; font-weight: 500; color: var(--sub); }
.sample__row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; border-bottom: 1px solid var(--line-soft); font-size: 15px; color: var(--sub); }
.sample__row:last-child { border-bottom: 0; }
.sample__row--ai { background: var(--tint); color: var(--text); }
.sample__tag { flex: 0 0 auto; font-size: 12px; }
.sample__row--ai .sample__tag { font-weight: 700; color: var(--accent); }
.sample__foot { padding: 12px 20px; border-top: 1px solid var(--line); background: var(--alt); font-size: 13px; color: var(--sub); }

/* Sections */
.section { padding: 112px 0; }
.section--alt { background: var(--alt); }
.section--ruled { border-top: 1px solid var(--line); }
.section__head { display: flex; flex-direction: column; gap: 12px; }
.section__title { font-size: clamp(24px, 2.6vw, 32px); line-height: 1.5; font-weight: 700; letter-spacing: 0.02em; }

/* Services */
.services { display: flex; flex-wrap: wrap; gap: 32px; align-items: stretch; }
.service { min-width: 0; display: flex; flex-direction: column; gap: 20px; border-radius: 6px; }
.service--primary { flex: 2 1 560px; padding: 40px; border: 1px solid var(--line); }
.service--secondary { flex: 1 1 320px; padding: 40px 32px; background: var(--alt); }
.service__title { font-size: 22px; line-height: 1.5; font-weight: 700; }
.service--primary .service__title { font-size: 26px; }
.service__lead { color: var(--body); }
.service--primary .service__lead { max-width: 620px; }
.service--secondary .service__lead { font-size: 15px; }
.items { display: flex; flex-direction: column; margin-top: 8px; }
.items--grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); gap: 0 32px; }
.item { display: flex; flex-direction: column; gap: 4px; padding: 16px 0; border-top: 1px solid var(--line); }
.items--grid .item { padding: 18px 0; }
.item dt { font-weight: 700; }
.item dd { font-size: 14.5px; color: var(--sub); }

/* Cards */
.cards { display: grid; gap: 32px; }
.cards--3 { grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); }
.cards--4 { grid-template-columns: repeat(auto-fit, minmax(min(230px, 100%), 1fr)); gap: 24px; }
.card { display: flex; flex-direction: column; gap: 12px; padding: 32px; background: var(--white); border: 1px solid var(--line); border-radius: 6px; font-size: 15px; color: var(--body); }
.card--step { gap: 10px; padding: 28px; }
.card__title { font-size: 19px; line-height: 1.6; font-weight: 700; color: var(--text); }
.step { font-size: 13px; font-weight: 700; letter-spacing: 0.08em; color: var(--accent); }

/* Works */
.works { display: flex; flex-direction: column; border-bottom: 1px solid var(--line); }
.work { display: flex; flex-wrap: wrap; gap: 8px 40px; padding: 28px 0; border-top: 1px solid var(--line); }
.work__tag { flex: 0 0 200px; padding-top: 6px; font-size: 13px; font-weight: 500; color: var(--sub); }
.work__body { flex: 1 1 420px; min-width: 0; display: flex; flex-direction: column; gap: 4px; font-size: 15px; color: var(--body); }
.work__title { font-size: 18px; line-height: 1.6; font-weight: 700; color: var(--text); }

/* Company */
.facts { max-width: 720px; display: flex; flex-direction: column; border-bottom: 1px solid var(--line); }
.fact { display: flex; flex-wrap: wrap; gap: 4px 24px; padding: 16px 0; border-top: 1px solid var(--line); }
.fact dt { flex: 0 0 120px; font-size: 14px; color: var(--sub); }
.fact dd { flex: 1 1 240px; }

/* Contact */
.section#contact { padding: 104px 0; }
.contact { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 48px 72px; }
.contact__copy { flex: 1 1 480px; min-width: 0; display: flex; flex-direction: column; gap: 20px; color: var(--body); }
.contact__copy > p:not(.label) { max-width: 520px; }
.contact__title { font-size: clamp(26px, 3vw, 38px); line-height: 1.5; font-weight: 700; letter-spacing: 0.02em; color: var(--text); }
.hints { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.hints__head { font-size: 13px; color: var(--sub); }
.hints ul { padding-left: 1.2em; list-style: disc; display: flex; flex-direction: column; gap: 4px; font-size: 15px; }

.form-card { flex: 1 1 440px; min-width: 0; padding: 32px; background: var(--white); border: 1px solid var(--line); border-radius: 6px; }
.form { display: flex; flex-direction: column; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 14px; font-weight: 500; }
.req { font-size: 12px; font-weight: 400; color: var(--danger); }
.help { font-size: 13px; color: var(--sub); }
.field input, .field textarea { width: 100%; padding: 10px 14px; border: 1px solid var(--field); border-radius: 4px; font: inherit; font-size: 16px; color: var(--text); background: var(--white); }
.field input { min-height: 48px; }
.field textarea { line-height: 1.7; resize: vertical; }
.field input:focus-visible, .field textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.field [aria-invalid="true"] { border-color: var(--danger); }
.field--trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.cf-turnstile { min-height: 65px; }
.consent { font-size: 13px; color: var(--sub); }
.status { font-size: 14px; min-height: 1.9em; }
.status--ok { color: var(--accent); font-weight: 500; }
.status--error { color: var(--danger); }

/* Footer */
.site-footer { border-top: 1px solid var(--line); color: var(--sub); font-size: 13px; }
.site-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 24px; padding-top: 28px; padding-bottom: 28px; }
.site-footer__meta { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.site-footer a { color: var(--sub); }

/* Document pages */
.doc { max-width: 760px; margin: 0 auto; padding: 72px 24px 104px; display: flex; flex-direction: column; gap: 32px; }
.doc h1 { font-size: clamp(24px, 2.6vw, 32px); line-height: 1.5; }
.doc h2 { font-size: 18px; line-height: 1.6; margin-bottom: 8px; }
.doc p, .doc li { color: var(--body); }
.doc ul { padding-left: 1.2em; list-style: disc; }
.doc__meta { font-size: 14px; color: var(--sub); }

@media (max-width: 720px) {
  .section { padding: 72px 0; }
  .section#contact { padding: 72px 0; }
  .hero { padding-top: 56px; padding-bottom: 72px; }
  .nav { gap: 4px 20px; }
  .service--primary, .service--secondary, .form-card { padding: 28px 20px; }
  .card { padding: 24px; }
  .work__tag { flex-basis: 100%; padding-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}