:root {
  /* 色は2色：夜の紺 #011A27 と淡い深青 #DCE6EE。--ink-soft と --line は2色から作った中間色 */
  --navy: #011a27;
  --pale: #dce6ee;
  --ink: var(--navy);
  --ink-soft: #46545c;
  --line: #c9d5df;
  --bg: #fcfdfe;
  --on-navy: #f3f6f9;   /* 紺の地に載せる文字。純白にしない */
  --bg-alt: var(--pale);
  --brand: var(--navy);
  --accent: var(--navy);
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", "BIZ UDPGothic", "Hiragino Sans", Meiryo, sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

a { color: var(--accent); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

.unset { color: #b4232c; font-weight: 600; }

/* header */
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 10; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.site-header__logo { color: var(--brand); text-decoration: none; font-size: 20px; letter-spacing: .01em; }
.site-header__logo b { font-weight: 700; }
.site-header__logo span { font-weight: 300; }
.site-nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 15px; }
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--brand); font-weight: 700; }
.site-nav__lang { border: 1px solid var(--line); border-radius: 999px; padding: 0 12px; }

/* hero */
.hero { background: var(--navy); color: var(--on-navy); padding: 88px 0 96px; }
.hero__title { margin: 0 0 20px; font-size: clamp(28px, 5vw, 44px); line-height: 1.35; }
.hero__lead { max-width: 680px; margin: 0 0 32px; color: #b4c3cf; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn { display: inline-block; padding: 12px 24px; border-radius: var(--radius); border: 1px solid color-mix(in srgb, var(--on-navy) 60%, transparent); color: var(--on-navy); white-space: nowrap; text-decoration: none; font-weight: 600; }
.btn--primary { background: var(--pale); border-color: var(--pale); color: var(--navy); }

/* sections */
.section { padding: 72px 0; }
.section--alt { background: var(--bg-alt); }
.section__title { margin: 0 0 32px; font-size: 26px; color: var(--brand); }
.section__more { margin: 24px 0 0; }

.page-head { background: var(--bg-alt); padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.page-head h1 { margin: 0 0 12px; color: var(--brand); }
.page-head p { margin: 0; max-width: 720px; color: var(--ink-soft); }

.concerns { list-style: none; padding: 0; margin: 0; max-width: 46em; font-size: 17px; }
.concerns li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.concerns li:first-child { border-top: 1px solid var(--line); }

/* 見出しと説明を左右に並べた行。カードにしない */
.reasons, .rows { margin: 0; }
.reason, .rows__item { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 6px 48px; padding: 22px 0; border-top: 1px solid var(--line); }
.reason:last-child, .rows__item:last-child { border-bottom: 1px solid var(--line); }
.reason h3 { margin: 0; font-size: 18px; color: var(--brand); }
.reason p, .rows dd { margin: 0; color: var(--ink-soft); max-width: 40em; }
.rows dt { font-weight: 700; color: var(--brand); }
@media (max-width: 700px) { .reason, .rows__item { grid-template-columns: minmax(0, 1fr); } }

.worklist { list-style: none; margin: 0; padding: 0; }
.worklist li { display: flex; justify-content: space-between; align-items: baseline; gap: 8px 24px; flex-wrap: wrap; padding: 14px 0; border-top: 1px solid var(--line); }
.worklist li:last-child { border-bottom: 1px solid var(--line); }
.worklist a { font-weight: 700; font-size: 17px; }
.worklist .badge { flex: none; }

.case { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.case__head h3 { margin: 0; font-size: 20px; }
.case__tags { margin: 4px 0 16px; color: var(--ink-soft); font-size: 14px; font-weight: 600; }
.case ul { margin: 0 0 16px; padding-left: 1.2em; }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; gap: 12px; }
.steps li { counter-increment: step; position: relative; padding: 16px 18px 16px 64px; border: 1px solid var(--line); border-radius: var(--radius); }
.steps li::before { content: counter(step); position: absolute; left: 18px; top: 16px; width: 30px; height: 30px; border-radius: 50%; background: var(--brand); color: var(--on-navy); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.steps strong { display: block; color: var(--brand); }

/* services page */
.service { border-bottom: 1px solid var(--line); padding: 32px 0; }
.service:first-child { padding-top: 0; }
.service__head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.service__head h2 { margin: 0; font-size: 22px; color: var(--brand); }
.service__price { margin: 0; font-weight: 700; color: var(--accent); white-space: nowrap; }
.service__lead { margin: 8px 0 12px; }
.service__label { margin: 0 0 4px; font-size: 13px; font-weight: 700; color: var(--accent); }
.service ul { margin: 0 0 16px; padding-left: 1.2em; color: var(--ink-soft); }
.service__fit { margin: 0; background: var(--bg-alt); border-radius: var(--radius); padding: 12px 16px; font-size: 15px; }
.service__fit span { display: block; font-size: 13px; font-weight: 700; color: var(--accent); }

.notes { margin: 0; padding-left: 1.2em; }

/* footer */
.site-footer { background: var(--brand); color: var(--on-navy); padding: 56px 0 40px; text-align: center; }
.site-footer a { color: var(--on-navy); font-weight: 600; }
.site-footer__cta { font-size: 20px; font-weight: 700; margin: 0 0 8px; }
.site-footer__small { margin: 32px 0 0; font-size: 13px; opacity: .7; }
.site-footer .unset { color: #ffb3b8; }
.site-footer__small + .site-footer__small { margin-top: 4px; }
.site-footer__name { text-decoration: none; }

/* works page */
.works { display: grid; gap: 24px; }
.case__client { margin: 0 0 4px; font-size: 13px; font-weight: 700; color: var(--ink-soft); }
.case__head h3 { margin: 0; font-size: 22px; color: var(--brand); }
.works__group { margin: 24px 0 0; font-size: 24px; color: var(--brand); }
.works__group:first-child { margin-top: 0; }
.case__links-label { margin: 0 0 4px; font-size: 13px; font-weight: 700; color: var(--accent); }
.site-nav__proto { border: 1px dashed var(--accent); border-radius: 999px; padding: 0 12px; }

/* flow / faq / company */
.check { display: inline-block; margin-left: 8px; padding: 0 8px; border-radius: 999px; background: #fdecee; color: #b4232c; font-size: 12px; font-weight: 700; vertical-align: middle; }
.steps--detail p { margin: 4px 0 0; color: var(--ink-soft); }
.steps__time { display: block; font-size: 13px; color: var(--accent); font-weight: 600; }

.faq { display: grid; gap: 12px; }
.faq__item { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; }
.faq__item summary { cursor: pointer; font-weight: 700; color: var(--brand); }
.faq__item p { margin: 12px 0 0; color: var(--ink-soft); }

.company { display: grid; grid-template-columns: 160px 1fr; margin: 0; border-top: 1px solid var(--line); }
.company dt, .company dd { margin: 0; padding: 14px 0; border-bottom: 1px solid var(--line); }
.company dt { font-weight: 700; color: var(--brand); }
@media (max-width: 600px) {
  .company { grid-template-columns: 1fr; }
  .company dt { border-bottom: 0; padding-bottom: 0; }
}
.company__sub { margin-top: 56px; }
.company__text { max-width: 760px; }

/* plans */
.plans { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 640px) { .plans { grid-template-columns: 1fr; } }
.plan { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; }
.plan:not(.plan--main) h3 { font-size: 16px; }
.plan h3 { margin: 0 0 8px; font-size: 17px; color: var(--brand); }
.plan__price { margin: 0; font-size: 24px; font-weight: 700; line-height: 1.3; }
.plan--main { padding: 28px; }
.plan--main h3 { font-size: 19px; }
.plan--main .plan__price { font-size: 36px; }
.plan__unit { margin-left: 6px; white-space: nowrap; font-size: 14px; font-weight: 600; color: var(--ink-soft); }
.plan__tax { margin: 0 0 12px; font-size: 13px; color: var(--ink-soft); }
.plan p:last-child { margin: 0; font-size: 15px; color: var(--ink-soft); }
.section--alt-top { border-top: 1px solid var(--line); }

/* compare */
.compare__title { margin: 48px 0 12px; font-size: 18px; color: var(--brand); }
.compare__scroll { overflow-x: auto; }
.compare { width: 100%; border-collapse: collapse; min-width: 480px; font-size: 15px; }
.compare th, .compare td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.compare thead th { font-size: 14px; color: var(--ink-soft); }
.compare thead th:nth-child(2), .compare td:nth-child(2) { background: var(--bg-alt); font-weight: 700; color: var(--brand); }
.compare small { font-weight: 400; font-size: 12px; }
.compare__note { margin: 12px 0 0; font-size: 13px; color: var(--ink-soft); }

/* scope */
.scope { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 16px; }
.scope__name { margin: 0 0 12px; font-size: 17px; color: var(--brand); }
.scope__cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 8px 32px; }
.scope__label { margin: 0 0 4px; font-size: 13px; font-weight: 700; color: var(--ink-soft); }
.scope__list { margin: 0; padding-left: 1.2em; font-size: 15px; }
.scope__list--in li::marker { content: "✓  "; color: var(--brand); }
.scope__note { margin: 8px 0 0; font-size: 13px; color: var(--ink-soft); }

/* philosophy */
.section--philosophy { background: var(--navy); color: var(--on-navy); padding: 96px 0; }
.section--philosophy .section__title { color: var(--pale); }
.philosophy p { max-width: 760px; margin: 0 0 12px; }
.company__sub .philosophy { background: var(--bg-alt); border-radius: var(--radius); padding: 28px; }
.company__sub .philosophy .section__title { margin-bottom: 16px; }
.case__links { display: flex; gap: 16px; flex-wrap: wrap; }

/* contact form */
.form { max-width: 680px; display: grid; gap: 22px; }
.form__row { display: grid; gap: 6px; }
.form__label { font-weight: 700; color: var(--brand); }
.form__tag { display: inline-block; margin-left: 6px; padding: 0 8px; border-radius: 999px; background: var(--bg-alt); color: var(--ink-soft); font-size: 12px; font-weight: 700; vertical-align: middle; }
.form__tag--req { background: var(--navy); color: var(--on-navy); }
.form__input { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--ink); font: inherit; }
.form__input:focus { outline: 2px solid var(--navy); outline-offset: 1px; border-color: var(--navy); }
.form__input[aria-invalid="true"] { border-color: #b4232c; }
.form__textarea { resize: vertical; min-height: 180px; }
.form__hint { margin: 0; font-size: 14px; color: var(--ink-soft); }
.form__error { margin: 0; color: #b4232c; font-size: 14px; font-weight: 600; }
.form__error--top { background: #fdecee; border-radius: var(--radius); padding: 12px 16px; }
.form__privacy { margin: 0; font-size: 14px; color: var(--ink-soft); }
.form__submit { justify-self: start; border: 0; cursor: pointer; font: inherit; font-weight: 600; background: var(--navy); color: var(--on-navy); }
.form__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__done { max-width: 680px; background: var(--bg-alt); border-radius: var(--radius); padding: 28px; }
.form__done h2 { margin: 0 0 8px; color: var(--brand); }
.site-footer .btn--primary { margin-top: 8px; color: var(--navy); }

/* キーボード操作の枠。紺の地では淡い色にする */
:focus-visible { outline: 2px solid var(--navy); outline-offset: 2px; }
.hero :focus-visible, .site-footer :focus-visible, .section--philosophy :focus-visible { outline-color: var(--pale); }
html, body { overflow-x: clip; }

/* 実績の種類のバッジ。デモだけ紺で塗り、ほかは線だけ */
.badge { display: inline-block; font-size: 13px; font-weight: 700; line-height: 1; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-soft); background: var(--bg); white-space: nowrap; }
.badge--demo { background: var(--navy); border-color: var(--navy); color: var(--on-navy); }
.badge--client, .badge--proposal { border-color: var(--ink-soft); color: var(--ink); }
.case__head { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 16px; align-items: start; }
.case__head .badge { grid-column: 2; grid-row: 1; }
.case__head h3 { grid-column: 1; grid-row: 1; }
.case__head .case__client, .case__head .case__tags { grid-column: 1 / -1; }
.case__head .case__client { margin: 4px 0 0; }
.case__head + p { margin-top: 0; }   /* グリッドの中は余白が重ならず、空きが倍になるため */

/* 代表の略歴 */
.company__bio { margin-top: 56px; }
.company__lead { max-width: 40em; margin: 0 0 20px; }
.bio { display: grid; grid-template-columns: 6em minmax(0, 1fr); margin: 0; max-width: 46em; border-top: 1px solid var(--line); }
.bio dt, .bio dd { margin: 0; padding: 10px 0; border-bottom: 1px solid var(--line); }
.bio dt { color: var(--ink-soft); font-variant-numeric: tabular-nums; }

/* 見出しは本文の行間（1.8）だと2行目が離れすぎる */
h1, h2, h3, h4 { line-height: 1.45; }

/* メニューの開閉ボタン。960px 以下でだけ出す */
.site-menu { display: none; align-items: center; gap: 6px; min-height: 44px; padding: 0 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--bg); color: var(--ink); font: inherit; font-size: 15px; font-weight: 600; cursor: pointer; }

.site-menu__x, .site-header.is-open .site-menu__bars { display: none; }
.site-header.is-open .site-menu__x { display: inline; }
/* 丸いボタンの外にもう1本枠を出すと二重に見えるので、ボタンの線を紺の2px にして枠の代わりにする */
.site-menu:focus-visible { outline: none; border-color: var(--navy); box-shadow: inset 0 0 0 1px var(--navy); }

@media (max-width: 960px) {
  .site-header__inner { min-height: 60px; gap: 0 16px; }
  .site-menu { display: inline-flex; margin: 8px 0; }   /* 開いたときも上の行の高さを60pxに保つ */
  .site-nav { display: none; flex-basis: 100%; flex-direction: column; gap: 0; padding: 0 0 16px; max-height: calc(100dvh - 60px); overflow-y: auto; }
  .site-header.is-open .site-nav { display: flex; }
  .site-nav a { padding: 12px 0; border-top: 1px solid var(--line); color: var(--ink); font-size: 16px; }
  .site-nav .site-nav__lang, .site-nav .site-nav__proto { align-self: flex-start; margin-top: 12px; padding: 6px 16px; }
  .site-nav__lang { border: 1px solid var(--line); }
}

@media (max-width: 600px) {
  .hero { padding: 48px 0 56px; }
  .hero__title { font-size: 28px; }
  .hero__actions { display: grid; }
  .hero__actions .btn { text-align: center; }

  .section { padding: 48px 0; }
  .section--philosophy { padding: 56px 0; }
  .section__title { margin-bottom: 24px; font-size: 22px; }
  .page-head { padding: 32px 0 28px; }
  .page-head h1 { font-size: 28px; }

  .reason, .rows__item { padding: 18px 0; }
  .case { padding: 20px 18px; }
  .case__head h3 { font-size: 19px; }
  .works__group { font-size: 21px; }
  .plan, .plan--main { padding: 18px; }
  .plan--main .plan__price { font-size: 30px; }
  .scope { padding: 18px; }
  .company__sub .philosophy, .form__done { padding: 20px 18px; }
  .faq__item { padding: 14px 16px; }

  /* 番号は見出しの横だけに置き、本文は字下げせず全幅で使う */
  .steps li { padding: 14px 16px; }
  .steps li::before { left: 16px; top: 14px; width: 28px; height: 28px; }
  .steps strong, .steps__time { padding-left: 40px; }
  .steps strong { min-height: 28px; line-height: 28px; margin-bottom: 4px; }

  .company, .bio { grid-template-columns: 1fr; }
  .company dt, .bio dt { border-bottom: 0; padding: 12px 0 0; font-size: 14px; }
  .company dd, .bio dd { padding: 2px 0 12px; }

  .site-footer { padding: 44px 0 32px; }
  .site-footer__cta { font-size: 18px; }

  /* 比較表：横スクロールにせず、1行を1つの囲みにして縦に並べる */
  .compare__title { margin-top: 40px; }
  .compare, .compare tbody, .compare tr, .compare th, .compare td { display: block; min-width: 0; }
  .compare thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .compare tr { border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
  .compare tbody th { padding: 12px 16px 8px; border: 0; font-size: 16px; color: var(--brand); }
  .compare td { display: flex; justify-content: space-between; align-items: baseline; gap: 4px 16px; flex-wrap: wrap; padding: 8px 16px; border: 0; border-top: 1px solid var(--line); }
  .compare td::before { content: attr(data-label); font-size: 14px; font-weight: 400; color: var(--ink-soft); }
}