/* =========================================================
   株式会社IHAD コーポレートサイト  共通スタイル
   配色: 藍(信頼) / 朱(アクセント) / 墨(文字) / 和紙(背景)
   書体: 表題=しっぽり明朝  本文=Noto Sans JP
========================================================= */

:root {
  --indigo:       #16304d;
  --indigo-deep:  #0e2236;
  --indigo-soft:  #2c4d70;
  --vermilion:    #c0453a;
  --vermilion-dk: #a4362c;
  --ink:          #21252b;
  --ink-soft:     #5c636d;
  --paper:        #faf7f1;
  --paper-warm:   #f3ede1;
  --card:         #ffffff;
  --line:         #e5dfd3;
  --line-dk:      #d4ccba;
  --gold:         #a8895a;

  --serif: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans:  "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;

  --wrap: 1120px;
  --gut: clamp(20px, 5vw, 64px);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  letter-spacing: .02em;
}

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

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gut); }

/* ---------- 共通: 見出し用エレメント ---------- */
.eyebrow {
  font-size: .72rem;
  letter-spacing: .32em;
  font-weight: 600;
  color: var(--vermilion);
  display: inline-flex;
  align-items: center;
  gap: .7em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--vermilion);
  display: inline-block;
}

.sec-title {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: .04em;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  color: var(--indigo);
  margin: .5rem 0 0;
}
.sec-title .en {
  display: block;
  font-family: var(--sans);
  font-size: .8rem;
  letter-spacing: .25em;
  color: var(--ink-soft);
  font-weight: 500;
  margin-top: .9rem;
}

/* ---------- 航路ライン (シグネチャー) ---------- */
.route {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--ink-soft);
}
.route .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--vermilion); flex: none; }
.route .ln  { height: 1px; flex: 1 1 auto; background: linear-gradient(90deg, var(--vermilion), var(--indigo-soft)); position: relative; }
.route .ln::after {
  content: "";
  position: absolute; right: 0; top: 50%;
  width: 6px; height: 6px; border-top: 1px solid var(--indigo-soft); border-right: 1px solid var(--indigo-soft);
  transform: translateY(-50%) rotate(45deg);
}

/* =========================================================
   ヘッダー
========================================================= */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 247, 241, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.head-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: baseline; gap: .65rem; }
.brand .mark {
  font-family: var(--serif); font-weight: 700;
  font-size: 1.45rem; letter-spacing: .12em; color: var(--indigo);
}
.brand .mark span { color: var(--vermilion); }
.brand .sub { font-size: .62rem; letter-spacing: .28em; color: var(--ink-soft); }

.nav { display: flex; align-items: center; gap: 2rem; }
.nav a {
  font-size: .85rem; font-weight: 500; letter-spacing: .08em;
  color: var(--ink); position: relative; padding: .3rem 0;
  transition: color .2s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; background: var(--vermilion); transition: width .25s;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--indigo); }
.nav a:hover::after, .nav a[aria-current="page"]::after { width: 100%; }

.nav .btn-contact {
  background: var(--indigo); color: #fff; padding: .65rem 1.3rem;
  border-radius: 2px; letter-spacing: .1em; transition: background .2s;
}
.nav .btn-contact::after { display: none; }
.nav .btn-contact:hover { background: var(--vermilion); color: #fff; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 30px; height: 24px; position: relative; }
.nav-toggle span { position: absolute; left: 0; width: 100%; height: 2px; background: var(--indigo); transition: .3s; }
.nav-toggle span:nth-child(1){ top: 2px; }
.nav-toggle span:nth-child(2){ top: 11px; }
.nav-toggle span:nth-child(3){ top: 20px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ top:11px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ top:11px; transform: rotate(-45deg); }

/* =========================================================
   ヒーロー
========================================================= */
.hero {
  position: relative; overflow: hidden;
  background: var(--indigo-deep);
  color: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 85% -10%, rgba(192,69,58,.22), transparent 55%),
    radial-gradient(90% 80% at 0% 110%, rgba(44,77,112,.55), transparent 60%);
}
.hero-inner { position: relative; padding: clamp(64px, 12vw, 130px) 0 clamp(56px, 10vw, 110px); }
.hero .route-jp {
  display: flex; align-items: center; gap: 14px;
  font-size: .78rem; letter-spacing: .25em; color: rgba(255,255,255,.7);
  margin-bottom: 2.4rem;
}
.hero .route-jp .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--vermilion); }
.hero .route-jp .ln { width: clamp(60px, 14vw, 150px); height: 1px; background: linear-gradient(90deg, var(--vermilion), rgba(255,255,255,.45)); }
.hero .route-jp .node { color: #fff; font-weight: 600; }

.hero h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.1rem, 6vw, 4rem);
  line-height: 1.4; letter-spacing: .05em;
}
.hero h1 .accent { color: #f0c9c3; }
.hero p.lead {
  margin-top: 1.8rem; max-width: 40ch;
  font-size: clamp(.95rem, 2.2vw, 1.1rem); color: rgba(255,255,255,.82); line-height: 2;
}
.hero .cta-row { margin-top: 2.8rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: .6em;
  padding: .95rem 1.9rem; border-radius: 2px;
  font-size: .9rem; font-weight: 600; letter-spacing: .08em;
  transition: transform .2s, background .2s, color .2s, border-color .2s;
}
.btn .arr { transition: transform .2s; }
.btn:hover .arr { transform: translateX(4px); }
.btn-primary { background: var(--vermilion); color: #fff; }
.btn-primary:hover { background: #fff; color: var(--indigo-deep); }
.btn-ghost { border: 1px solid rgba(255,255,255,.4); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.btn-dark { background: var(--indigo); color: #fff; }
.btn-dark:hover { background: var(--vermilion); }

/* =========================================================
   セクション共通
========================================================= */
section { padding: clamp(56px, 9vw, 104px) 0; }
.sec-head { max-width: 720px; margin-bottom: clamp(2.4rem, 5vw, 3.6rem); }
.sec-head p.desc { margin-top: 1.2rem; color: var(--ink-soft); }

.bg-warm { background: var(--paper-warm); }
.bg-indigo { background: var(--indigo-deep); color: #fff; }
.bg-indigo .sec-title { color: #fff; }
.bg-indigo .sec-head p.desc { color: rgba(255,255,255,.78); }

/* ---------- 3本柱カード ---------- */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.pillar {
  background: var(--card); border: 1px solid var(--line);
  padding: 2.4rem 2rem; border-radius: 3px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  position: relative; overflow: hidden;
}
.pillar::before {
  content: ""; position: absolute; left: 0; top: 0; width: 3px; height: 0;
  background: var(--vermilion); transition: height .3s;
}
.pillar:hover { transform: translateY(-5px); box-shadow: 0 18px 40px -22px rgba(22,48,77,.45); border-color: var(--line-dk); }
.pillar:hover::before { height: 100%; }
.pillar .no { font-family: var(--serif); font-size: .9rem; color: var(--vermilion); letter-spacing: .15em; }
.pillar h3 { font-family: var(--serif); font-size: 1.3rem; color: var(--indigo); margin: .7rem 0 1rem; letter-spacing: .04em; line-height: 1.5; }
.pillar p { font-size: .9rem; color: var(--ink-soft); line-height: 1.95; }

/* ---------- 数値 ---------- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.stat { text-align: center; }
.stat .num { font-family: var(--serif); font-size: clamp(2.4rem, 6vw, 3.6rem); color: #fff; line-height: 1; }
.stat .num small { font-size: .9rem; margin-left: .2em; }
.stat .lbl { margin-top: .9rem; font-size: .82rem; letter-spacing: .12em; color: rgba(255,255,255,.7); }

/* ---------- リード / 帯CTA ---------- */
.band {
  background: var(--indigo); color: #fff; text-align: center;
  padding: clamp(48px, 8vw, 84px) 0;
}
.band h2 { font-family: var(--serif); font-size: clamp(1.5rem, 4vw, 2.3rem); letter-spacing: .05em; line-height: 1.5; }
.band p { margin: 1.2rem auto 2.2rem; color: rgba(255,255,255,.82); max-width: 46ch; }

/* =========================================================
   会社概要ページ
========================================================= */
.greeting { display: grid; grid-template-columns: 1fr 1.4fr; gap: clamp(2rem, 6vw, 4.5rem); align-items: start; }
.greeting .photo {
  aspect-ratio: 3/4; background: linear-gradient(160deg, var(--indigo-soft), var(--indigo-deep));
  border-radius: 4px; position: relative; overflow: hidden; display: flex; align-items: flex-end; padding: 1.6rem;
}
.greeting .photo::after { content: "代表写真"; color: rgba(255,255,255,.5); font-size: .8rem; letter-spacing: .2em; }
.greeting .photo .seal {
  position: absolute; top: 1.4rem; right: 1.4rem; width: 58px; height: 58px;
  border: 2px solid var(--vermilion); color: var(--vermilion); border-radius: 4px;
  font-family: var(--serif); display: grid; place-items: center; font-size: .75rem; letter-spacing: .1em;
  writing-mode: vertical-rl;
}
.greeting .body h3 { font-family: var(--serif); font-size: clamp(1.4rem, 3.4vw, 2rem); color: var(--indigo); line-height: 1.6; letter-spacing: .05em; }
.greeting .body p { margin-top: 1.4rem; color: var(--ink); }
.greeting .body .sign { margin-top: 2rem; font-family: var(--serif); }
.greeting .body .sign .role { font-size: .82rem; color: var(--ink-soft); letter-spacing: .15em; }
.greeting .body .sign .name { font-size: 1.4rem; color: var(--indigo); margin-top: .3rem; letter-spacing: .2em; }

.info-table { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line-dk); }
.info-table th, .info-table td { text-align: left; padding: 1.15rem 1rem; border-bottom: 1px solid var(--line); vertical-align: top; font-size: .92rem; }
.info-table th { width: 30%; color: var(--indigo); font-weight: 600; letter-spacing: .08em; background: var(--paper-warm); }
.fill { color: var(--vermilion); font-style: normal; background: rgba(192,69,58,.08); padding: .1em .5em; border-radius: 2px; font-size: .9em; }

/* ---------- 沿革 ---------- */
.timeline { border-left: 2px solid var(--line-dk); margin-left: .5rem; }
.tl-item { position: relative; padding: 0 0 2.2rem 2.2rem; }
.tl-item::before { content: ""; position: absolute; left: -7px; top: .4rem; width: 12px; height: 12px; border-radius: 50%; background: var(--vermilion); border: 2px solid var(--paper); }
.tl-item .yr { font-family: var(--serif); color: var(--indigo); font-size: 1.1rem; letter-spacing: .1em; }
.tl-item p { color: var(--ink-soft); font-size: .9rem; margin-top: .3rem; }

/* =========================================================
   事業内容ページ
========================================================= */
.biz { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
.biz-card { background: var(--card); border: 1px solid var(--line); border-radius: 3px; padding: 2.4rem; transition: box-shadow .25s, transform .25s; }
.biz-card:hover { box-shadow: 0 18px 40px -24px rgba(22,48,77,.4); transform: translateY(-4px); }
.biz-card .tag { font-size: .7rem; letter-spacing: .2em; color: var(--vermilion); font-weight: 600; }
.biz-card h3 { font-family: var(--serif); font-size: 1.4rem; color: var(--indigo); margin: .6rem 0 1rem; letter-spacing: .04em; }
.biz-card p { font-size: .92rem; color: var(--ink-soft); }
.biz-card ul { margin-top: 1.2rem; list-style: none; display: grid; gap: .55rem; }
.biz-card li { font-size: .85rem; color: var(--ink); padding-left: 1.4rem; position: relative; }
.biz-card li::before { content: ""; position: absolute; left: 0; top: .65em; width: 7px; height: 7px; background: var(--vermilion); border-radius: 50%; }

/* ---------- フロー ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; counter-reset: step; }
.flow-step { background: var(--card); border: 1px solid var(--line); border-radius: 3px; padding: 1.8rem 1.4rem; position: relative; }
.flow-step .n { font-family: var(--serif); font-size: 2rem; color: var(--line-dk); line-height: 1; }
.flow-step h4 { color: var(--indigo); margin: .6rem 0 .5rem; font-size: 1.05rem; letter-spacing: .04em; }
.flow-step p { font-size: .82rem; color: var(--ink-soft); }

/* =========================================================
   選ばれる理由ページ
========================================================= */
.reasons { display: grid; gap: 1.4rem; }
.reason { display: grid; grid-template-columns: auto 1fr; gap: 2rem; align-items: start; background: var(--card); border: 1px solid var(--line); border-radius: 3px; padding: 2.4rem clamp(1.6rem, 4vw, 3rem); }
.reason .idx { font-family: var(--serif); font-size: clamp(2.4rem, 6vw, 3.4rem); color: var(--vermilion); line-height: 1; opacity: .85; }
.reason h3 { font-family: var(--serif); font-size: 1.4rem; color: var(--indigo); letter-spacing: .04em; line-height: 1.5; }
.reason p { margin-top: 1rem; color: var(--ink-soft); font-size: .94rem; }

/* =========================================================
   お問い合わせページ
========================================================= */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: clamp(2rem, 6vw, 4.5rem); align-items: start; }
.contact-info .item { padding: 1.4rem 0; border-bottom: 1px solid var(--line); }
.contact-info .item .k { font-size: .72rem; letter-spacing: .2em; color: var(--vermilion); font-weight: 600; }
.contact-info .item .v { font-size: 1.05rem; color: var(--indigo); margin-top: .4rem; font-family: var(--serif); letter-spacing: .04em; }
.contact-info .item .v small { display: block; font-family: var(--sans); font-size: .8rem; color: var(--ink-soft); letter-spacing: .04em; margin-top: .3rem; }

.form { background: var(--card); border: 1px solid var(--line); border-radius: 4px; padding: clamp(1.8rem, 4vw, 2.8rem); }
.field { margin-bottom: 1.5rem; }
.field label { display: block; font-size: .82rem; font-weight: 600; color: var(--indigo); letter-spacing: .06em; margin-bottom: .55rem; }
.field label .req { color: var(--vermilion); font-size: .72rem; margin-left: .5em; }
.field input, .field textarea, .field select {
  width: 100%; padding: .85rem 1rem; border: 1px solid var(--line-dk); border-radius: 3px;
  font-family: var(--sans); font-size: .95rem; color: var(--ink); background: var(--paper);
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--indigo); box-shadow: 0 0 0 3px rgba(22,48,77,.1);
}
.field textarea { resize: vertical; min-height: 140px; }
.form .note { font-size: .78rem; color: var(--ink-soft); margin-top: -.6rem; margin-bottom: 1.5rem; }
.form button { width: 100%; border: 0; cursor: pointer; }

/* =========================================================
   ページヘッダー (下層共通)
========================================================= */
.page-hero { background: var(--indigo-deep); color: #fff; padding: clamp(56px, 9vw, 96px) 0 clamp(40px, 6vw, 64px); position: relative; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; background: radial-gradient(100% 100% at 90% -20%, rgba(192,69,58,.2), transparent 55%); }
.page-hero .inner { position: relative; }
.page-hero h1 { font-family: var(--serif); font-size: clamp(1.9rem, 5vw, 3rem); letter-spacing: .06em; margin-top: 1rem; }
.page-hero .en { font-size: .78rem; letter-spacing: .3em; color: rgba(255,255,255,.6); }
.crumbs { font-size: .76rem; color: rgba(255,255,255,.6); margin-top: 1.4rem; letter-spacing: .08em; }
.crumbs a:hover { color: #fff; }

/* =========================================================
   フッター
========================================================= */
.site-foot { background: var(--indigo-deep); color: rgba(255,255,255,.7); padding: clamp(48px, 7vw, 72px) 0 2rem; }
.foot-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; padding-bottom: 2.8rem; border-bottom: 1px solid rgba(255,255,255,.12); }
.foot-brand .mark { font-family: var(--serif); font-size: 1.5rem; color: #fff; letter-spacing: .12em; }
.foot-brand .mark span { color: var(--vermilion); }
.foot-brand p { margin-top: 1rem; font-size: .82rem; line-height: 1.9; }
.foot-col h4 { color: #fff; font-size: .8rem; letter-spacing: .15em; margin-bottom: 1.1rem; font-weight: 600; }
.foot-col a, .foot-col p { display: block; font-size: .85rem; padding: .35rem 0; transition: color .2s; }
.foot-col a:hover { color: #fff; }
.foot-bottom { padding-top: 1.6rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: .6rem; font-size: .74rem; letter-spacing: .06em; }

/* =========================================================
   レスポンシブ
========================================================= */
@media (max-width: 900px) {
  .pillars, .biz, .flow, .stats { grid-template-columns: 1fr 1fr; }
  .greeting, .contact-grid { grid-template-columns: 1fr; }
  .greeting .photo { aspect-ratio: 16/10; max-width: 360px; }
  .foot-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav { position: fixed; inset: 76px 0 auto 0; background: var(--paper); flex-direction: column; align-items: stretch; gap: 0; padding: 1rem var(--gut) 2rem; border-bottom: 1px solid var(--line); transform: translateY(-120%); transition: transform .3s; box-shadow: 0 20px 30px -20px rgba(0,0,0,.2); }
  .nav[data-open="true"] { transform: translateY(0); }
  .nav a { padding: 1rem 0; border-bottom: 1px solid var(--line); }
  .nav a::after { display: none; }
  .nav .btn-contact { text-align: center; margin-top: 1rem; border-bottom: 0; }
  .nav-toggle { display: block; }
  .pillars, .biz, .flow, .stats, .reason { grid-template-columns: 1fr; }
  .reason { grid-template-columns: auto 1fr; gap: 1.2rem; }
  .foot-top { grid-template-columns: 1fr; gap: 2rem; }
  .info-table th { width: 38%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1 !important; transform: none !important; }
}

/* スクロール出現 (JS有効時のみ隠す) */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }