/* 北本建設株式会社 ご提案用デモ CSS（白紙から新規作成。他社デモの流用なし） */

:root{
  --navy:#0f3a63;
  --navy-d:#0a2c4d;
  --blue:#1f6fb0;
  --amber:#e08a1e;
  --paper:#f6f8fa;
  --ink:#1c2733;
  --sub:#4c5b6b;
  --line:#dbe1e8;
  --radius:10px;
  --shadow:0 10px 24px rgba(15,58,99,.09);
  --ff-head:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",-apple-system,BlinkMacSystemFont,sans-serif;
  --ff-body:"Noto Sans JP","Hiragino Sans","Yu Gothic",-apple-system,BlinkMacSystemFont,sans-serif;
}

*{box-sizing:border-box}
html{font-size:16px}
body{
  margin:0;
  font-family:var(--ff-body);
  font-size:1.0625rem; /* 17px */
  line-height:1.85;
  color:var(--ink);
  background:#fff;
  -webkit-text-size-adjust:100%;
}
h1,h2,h3,h4{
  font-family:var(--ff-head);
  color:var(--navy);
  line-height:1.45;
  margin:0 0 .6em;
}
h1{font-size:clamp(1.7rem,4.4vw,2.5rem)}
h2{font-size:clamp(1.35rem,3vw,1.85rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
a{color:var(--blue)}
img{max-width:100%;height:auto;display:block}
ul,ol{margin:0;padding:0}
li{list-style:none}
.inner{max-width:1120px;margin:0 auto;padding:0 24px}

/* ------------ デモ帯 ------------ */
.demo-bar{background:#fff3d6;border-bottom:1px solid #e8c877;color:#5a4300;font-size:.85rem;line-height:1.6}
.demo-bar .inner{display:flex;flex-wrap:wrap;gap:6px 18px;padding:8px 24px;max-width:1120px;margin:0 auto}
.demo-bar a{color:#5a4300;font-weight:700}

/* ------------ ヘッダー ------------ */
.header{background:#fff;border-bottom:1px solid var(--line)}
.header-inner{
  max-width:1120px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:14px;flex-wrap:nowrap;
}
.brand{display:flex;flex-direction:column;gap:2px;text-decoration:none;color:var(--navy);flex:none;min-width:0}
.brand .name{font-family:var(--ff-head);font-weight:700;font-size:1.15rem;white-space:nowrap}
.brand small{color:var(--sub);font-size:.78rem;white-space:nowrap}

.gnav{margin-left:4px}
.gnav ul{display:flex;gap:0;margin:0;padding:0}
.gnav a{
  display:block;padding:10px 10px;color:var(--ink);text-decoration:none;font-size:.92rem;font-weight:700;
  border-radius:6px;white-space:nowrap;
}
.gnav a:hover,.gnav a[aria-current="page"]{color:var(--navy);background:var(--paper)}

.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.tel-link{display:flex;flex-direction:column;line-height:1.3;text-decoration:none;color:var(--navy);text-align:right;white-space:nowrap}
.tel-link b{font-family:var(--ff-head);font-size:1.2rem;letter-spacing:.02em;white-space:nowrap}
.tel-link small{color:var(--sub);font-size:.76rem;white-space:nowrap}
.btn-head{
  background:var(--amber);color:#fff;font-weight:700;text-decoration:none;
  padding:11px 18px;border-radius:8px;white-space:nowrap;font-size:.92rem;
}
.btn-head:hover{background:#c8790f}

.nav-toggle{
  display:none;flex:none;width:46px;height:46px;border:1px solid var(--line);border-radius:8px;
  background:#fff;position:relative;cursor:pointer;padding:0;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:12px;right:12px;height:2px;background:var(--navy);
}
.nav-toggle span{top:50%;transform:translateY(-50%)}
.nav-toggle span::before{top:-8px}
.nav-toggle span::after{top:8px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ------------ ヒーロー ------------ */
.hero{position:relative;background:var(--navy-d);color:#fff;overflow:hidden}
.hero-media{position:absolute;inset:0}
.hero-media img{width:100%;height:100%;object-fit:cover;opacity:.4}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,44,77,.55),rgba(10,44,77,.85))}
.hero-inner{
  position:relative;max-width:1120px;margin:0 auto;padding:64px 24px 56px;
  min-height:min(56vh,480px);display:flex;flex-direction:column;justify-content:center;
}
.hero h1{color:#fff;margin-bottom:.5em}
.hero h1 em{color:#ffcf8b;font-style:normal}
.hero .sub{color:#dfe8f2;font-size:1.02rem;max-width:640px;margin-bottom:1.6em}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}

.btn{display:inline-block;padding:13px 26px;border-radius:8px;font-weight:700;text-decoration:none;font-size:1rem}
.btn-primary{background:var(--amber);color:#fff}
.btn-primary:hover{background:#c8790f}
.btn-ghost{background:rgba(255,255,255,.08);color:#fff;border:1px solid rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.18)}
.btn-line{background:#fff;color:var(--navy);border:1.5px solid var(--navy);padding:11px 22px;border-radius:8px;font-weight:700;text-decoration:none;display:inline-block}
.btn-line:hover{background:var(--paper)}

/* ------------ 信頼バー ------------ */
.stats{background:var(--navy);color:#fff}
.stats .inner{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:26px 24px;
}
.stat dt{font-size:.78rem;color:#a9c2da;margin:0 0 4px;font-weight:700;letter-spacing:.03em}
.stat dd{margin:0;font-family:var(--ff-head);font-size:1.1rem;font-weight:700}
.stat dd small{display:block;font-family:var(--ff-body);font-weight:400;font-size:.78rem;color:#c9dbec;margin-top:2px}

/* ------------ セクション共通 ------------ */
.section{padding:64px 0}
.section.soft{background:var(--paper)}
.section.dark{background:var(--navy-d);color:#fff}
.section.dark h2{color:#fff}
.section-head{max-width:760px;margin:0 0 2.2rem}
.section-head .eyebrow{
  display:inline-block;font-family:var(--ff-head);font-size:.78rem;letter-spacing:.12em;color:var(--amber);
  font-weight:700;margin-bottom:.6em;
}
.section-head p{color:var(--sub)}
.section.dark .section-head p{color:#cfe0ee}

/* ------------ 事業3本柱 ------------ */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pillar{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;text-decoration:none;color:var(--ink);
}
.pillar .pic{aspect-ratio:4/3;overflow:hidden;background:#eef1f4}
.pillar .pic img{width:100%;height:100%;object-fit:cover}
.pillar-body{padding:20px 20px 22px;flex:1;display:flex;flex-direction:column}
.pillar-tag{font-size:.74rem;color:var(--amber);font-weight:700;letter-spacing:.04em;margin-bottom:.4em}
.pillar h3{margin-bottom:.5em}
.pillar p{color:var(--sub);font-size:.96rem;flex:1}
.pillar .more{font-weight:700;font-size:.92rem;color:var(--navy)}

/* ------------ カード（施工実績） ------------ */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:0;overflow:hidden;min-width:0;
}
.card .ph{
  aspect-ratio:4/3;background:repeating-linear-gradient(135deg,#eef1f4,#eef1f4 10px,#e4e9ee 10px,#e4e9ee 20px);
  display:flex;align-items:center;justify-content:center;color:#8695a5;font-size:.86rem;text-align:center;
  padding:12px;line-height:1.6;
}
.card-body{padding:18px 20px 20px}
.card-tag{display:inline-block;font-size:.76rem;font-weight:700;color:#fff;background:var(--navy);padding:3px 10px;border-radius:100px;margin-bottom:.7em}
.card h3{font-size:1.02rem;margin-bottom:.4em}
.card p{color:var(--sub);font-size:.92rem;margin-bottom:0}

/* ------------ 選ばれる理由 ------------ */
.reasons{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.reason{padding:22px 20px;border-left:3px solid var(--amber);background:#fff}
.reason h3{margin-bottom:.5em;font-size:1.05rem}
.reason p{color:var(--sub);font-size:.94rem;margin-bottom:0}

/* ------------ split(写真+文章) ------------ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.split.rev .split-media{order:2}
.split-media img{border-radius:var(--radius);width:100%;aspect-ratio:4/3;object-fit:cover}
.split-text p{color:var(--sub)}

/* ------------ タイル一覧 ------------ */
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.tiles li{
  background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px;font-weight:700;
  color:var(--navy);font-size:.98rem;
}
.tiles li small{display:block;color:var(--sub);font-weight:400;font-size:.8rem;margin-top:3px}

/* ------------ 概要表 ------------ */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:var(--radius);background:#fff;min-width:0}
table.overview{width:100%;border-collapse:collapse;min-width:520px}
table.overview th,table.overview td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:.96rem;vertical-align:top}
table.overview th{width:9.5em;background:var(--paper);color:var(--navy);font-weight:700;white-space:nowrap}
table.overview tr:last-child th,table.overview tr:last-child td{border-bottom:none}

/* ------------ CTA帯 ------------ */
.cta{background:var(--navy);color:#fff;padding:56px 0;text-align:center}
.cta h2{color:#fff}
.cta p{color:#cfe0ee}
.cta .hero-cta{justify-content:center}

/* ------------ フッター ------------ */
.footer{background:var(--navy-d);color:#cfe0ee;padding:48px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:28px}
.footer h3{color:#fff;font-size:1rem;margin-bottom:.8em}
.footer p{font-size:.9rem;line-height:1.85;margin-bottom:.6em}
.footer a{color:#cfe0ee}
.footer ul li{margin-bottom:.5em}
.footer ul a{font-size:.9rem;text-decoration:none}
.footer ul a:hover{text-decoration:underline}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.15);padding-top:18px;font-size:.78rem;color:#9db6cc;line-height:1.8;
}

/* ------------ スマホ固定バー ------------ */
.sp-bar{display:none}

/* ------------ フォーム ------------ */
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:0}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px}
.contact-card h3{font-size:.95rem;color:var(--sub);font-weight:700;margin-bottom:.6em}
.contact-card .big{font-family:var(--ff-head);font-size:1.5rem;font-weight:700;color:var(--navy)}
.contact-card .big a{color:var(--navy);text-decoration:none}

.form{max-width:720px}
.field{margin-bottom:1.3em}
.field label{display:block;font-weight:700;margin-bottom:.45em;font-size:.96rem}
.field .req{display:inline-block;background:#c0392b;color:#fff;font-size:.75rem;font-weight:700;padding:2px 7px;border-radius:4px;margin-left:.5em;vertical-align:middle}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:1rem;font-family:inherit;
  background:#fff;color:var(--ink);
}
.field textarea{min-height:150px;resize:vertical}
.form-note{font-size:.86rem;color:var(--sub)}
.note{background:var(--paper);border:1px dashed #b9c6d2;border-radius:var(--radius);padding:18px 20px}
.note h3{font-size:1rem;margin-bottom:.4em}
.note p{color:var(--sub);font-size:.92rem;margin-bottom:0}

.steps{counter-reset:step;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.steps li{counter-increment:step;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px;position:relative}
.steps li::before{
  content:counter(step);display:flex;align-items:center;justify-content:center;
  width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;font-family:var(--ff-head);font-weight:700;
  margin-bottom:.7em;font-size:.92rem;
}
.steps h3{font-size:.98rem;margin-bottom:.35em}
.steps p{color:var(--sub);font-size:.88rem;margin-bottom:0}

/* ------------ レスポンシブ ------------ */
body.nav-open{overflow:hidden}

@media (max-width:960px){
  .gnav{
    position:fixed;inset:0;background:var(--navy-d);z-index:200;
    opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .22s ease,visibility .22s ease;
    margin-left:0;overflow-y:auto;
  }
  .gnav.open{opacity:1;visibility:visible;pointer-events:auto}
  .gnav ul{
    flex-direction:column;min-height:100%;justify-content:center;gap:4px;
    padding:110px 28px 48px;
  }
  .gnav a{color:#fff;font-size:1.2rem;padding:15px 10px;border-bottom:1px solid rgba(255,255,255,.15);border-radius:0}
  .gnav a:hover,.gnav a[aria-current="page"]{background:rgba(255,255,255,.08);color:#fff}
  .nav-toggle{display:block}
  .btn-head{display:none}
  .pillars{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .reasons{grid-template-columns:1fr}
  .tiles{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr}
  .split.rev .split-media{order:0}
  .footer-grid{grid-template-columns:1fr}
  .contact-cards{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  body{padding-bottom:64px}
  .sp-bar{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:150;
    box-shadow:0 -4px 14px rgba(0,0,0,.12);
  }
  .sp-bar a{
    flex:1;text-align:center;padding:14px 8px;font-weight:700;text-decoration:none;font-size:.95rem;
  }
  .sp-bar a:first-child{background:var(--navy);color:#fff}
  .sp-bar a:last-child{background:var(--amber);color:#fff}
}

@media (max-width:640px){
  .stats .inner{grid-template-columns:1fr 1fr}
}

@media (max-width:520px){
  .header-inner{gap:10px}
  .brand{flex:0 1 auto;min-width:0}
  .brand .name{white-space:normal;font-size:1.08rem}
  .brand small{white-space:normal}
  .header-actions{gap:8px}
  .tel-link{display:none}
  .nav-toggle{flex:none}
  .section{padding:44px 0}
  .hero-inner{padding:48px 20px 42px}
  .footer-grid{gap:24px}
}