@charset "UTF-8";
/* ============================================================
   大光電設 提案見本 スタイルシート（新規・様式⑥信頼感／硬×モダン）
   図解イラスト×実績×青×グリッド安定。色数は少なく、信頼を前面に。
   1.テーマ変数 2.リセット 3.注釈/切替/ヘッダー 4.ヒーロー（図解イラスト）
   5.信頼バッジ帯 6.私たち 7.事業内容(グリッド) 8.施工実績 9.選ばれる理由
   10.会社概要 11.お問い合わせ 12.フッター 13.レスポンシブ
   ============================================================ */

/* ---------- 1. テーマ変数（3案とも硬×モダンの青系・色数少なめ） ---------- */
body.theme-a{ /* 信頼の青 */
  --ink:#20303f; --brand:#1c5aa8; --brand-deep:#123a6e;
  --bg-main:#f3f6fb; --bg-alt:#ffffff; --line:#dde5f0;
  --sub:#d9a441; --em:#f0c477; --badge:rgba(18,58,110,.86);
  --font-head:"Zen Kaku Gothic New",sans-serif; --head-weight:800;
}
body.theme-b{ /* 実直な紺グレー */
  --ink:#26333f; --brand:#2f4a63; --brand-deep:#1d3346;
  --bg-main:#f4f6f8; --bg-alt:#ffffff; --line:#dde3ea;
  --sub:#c98a3a; --em:#e6b56b; --badge:rgba(29,51,70,.86);
  --font-head:"Zen Kaku Gothic New",sans-serif; --head-weight:800;
}
body.theme-c{ /* 先進のシアン */
  --ink:#1e3038; --brand:#0e7fa6; --brand-deep:#0a5a78;
  --bg-main:#f1f7fa; --bg-alt:#ffffff; --line:#d7e6ec;
  --sub:#ef9f38; --em:#ffc164; --badge:rgba(10,90,120,.86);
  --font-head:"Zen Kaku Gothic New",sans-serif; --head-weight:900;
}
body.fz-s{--fz:.9} body.fz-l{--fz:1.1}

/* ---------- 2. リセット・基礎 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
:root{color-scheme:only light}
html{scroll-behavior:smooth;scroll-padding-top:150px}
body{font-family:"Zen Kaku Gothic New",sans-serif;color:var(--ink);background:var(--bg-main);line-height:1.9;letter-spacing:.02em;transition:background .4s}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.nb{display:inline-block}
.inner{max-width:1080px;margin:0 auto;padding:0 20px}
section{padding:76px 0}
.sec-label{font-family:var(--font-head);color:var(--sub);font-size:14px;letter-spacing:.12em;font-weight:800;text-align:center}
.sec-label--left{text-align:left}
h2{font-family:var(--font-head);font-weight:var(--head-weight);font-size:clamp(24px,3vw,34px);color:var(--brand-deep);text-align:center;margin:6px 0 10px;line-height:1.35}
.sec-sub{text-align:center;color:#5c6672;font-size:calc(16px*var(--fz,1));max-width:42em;margin:0 auto 40px;word-break:keep-all;overflow-wrap:anywhere}
.about .sec-label--left + h2{text-align:left}

/* ---------- 3a. 注釈バー ---------- */
.proposal-note{background:#3c4757;color:#eceef1;font-size:13px;line-height:1.7;text-align:center;padding:10px 18px}

/* ---------- 3b. デザイン切り替え帯 ---------- */
.theme-switch{position:sticky;top:0;z-index:50;background:var(--brand-deep);color:#fff;transition:background .4s}
.ts-inner{max-width:1180px;margin:0 auto;padding:9px 16px;display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap;justify-content:center}
.ts-label{font-size:13px;color:rgba(255,255,255,.9);letter-spacing:.04em}
.ts-btns{display:flex;gap:8px;flex-wrap:wrap}
.ts-btn{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.1);color:#fff;border:1.5px solid rgba(255,255,255,.4);border-radius:20px;font-family:inherit;font-size:13px;font-weight:700;padding:5px 13px;cursor:pointer;transition:.2s}
.ts-btn:hover{background:rgba(255,255,255,.2)}
.ts-btn.active{background:#fff;color:var(--brand-deep);border-color:#fff}
.dot{width:12px;height:12px;border-radius:50%;display:inline-block}
.dot-a{background:linear-gradient(135deg,#123a6e 55%,#d9a441 55%)}
.dot-b{background:linear-gradient(135deg,#1d3346 55%,#c98a3a 55%)}
.dot-c{background:linear-gradient(135deg,#0a5a78 55%,#ef9f38 55%)}
.fs-btns{display:flex;gap:6px;align-items:center}
.fs-btn{background:rgba(255,255,255,.1);color:#fff;border:1.5px solid rgba(255,255,255,.45);border-radius:16px;font-family:inherit;font-weight:700;padding:3px 12px;cursor:pointer;transition:.2s}
.fs-btn:nth-child(1){font-size:13px}.fs-btn:nth-child(2){font-size:15px}.fs-btn:nth-child(3){font-size:17px}
.fs-btn.active{background:#fff;color:var(--brand-deep);border-color:#fff}

/* ---------- 3c. ヘッダー ---------- */
header{position:sticky;top:var(--ts-h,42px);z-index:40;background:color-mix(in srgb, var(--bg-alt) 94%, transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.header-inner{max-width:1180px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:18px}
.brand{font-family:var(--font-head);font-size:24px;font-weight:var(--head-weight);color:var(--brand-deep);line-height:1.2;white-space:nowrap;margin-right:auto}
.brand small{display:block;font-size:12px;font-weight:500;letter-spacing:.04em;color:var(--sub)}
nav ul{list-style:none;display:flex;gap:20px}
nav a{font-size:15px;font-weight:700;color:var(--ink);padding:4px 2px;border-bottom:2px solid transparent;transition:.15s}
nav a:hover{color:var(--brand);border-color:var(--sub)}
.header-tel{text-align:right;line-height:1.25}
.header-tel a{font-family:var(--font-head);font-size:22px;font-weight:800;color:var(--brand-deep)}
.header-tel span{display:block;font-size:12px;color:#6a7480}
.menu-btn{display:none}

/* ---------- 4. ヒーロー（図解イラスト＋横組み） ---------- */
.hero{position:relative;overflow:hidden;padding:0;min-height:var(--hero-h,74vh);display:flex;align-items:center}
.hero-media{position:absolute;inset:0;z-index:0;background:#0d2748}
.hero-media img{width:100%;height:100%;object-fit:cover}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(100deg, rgba(10,30,60,.82) 0%, rgba(10,30,60,.5) 42%, rgba(10,30,60,.05) 100%)}
.hero-inner{position:relative;z-index:1;width:100%;max-width:1120px;margin:0 auto;padding:0 clamp(24px,6vw,80px);color:#fff}
.hero-eyebrow{font-family:var(--font-head);font-size:14px;letter-spacing:.08em;color:#fff;opacity:.92;margin-bottom:18px;border-left:3px solid var(--sub);padding-left:12px}
.hero-h1{font-family:var(--font-head);font-weight:var(--head-weight);font-size:clamp(32px,5vw,58px);line-height:1.28;letter-spacing:.01em;text-shadow:0 2px 20px rgba(0,0,0,.4)}
.hero-h1 .nb:last-child{color:var(--em)}
.hero-lead{margin-top:22px;font-size:calc(16px*var(--fz,1));line-height:1.95;color:rgba(255,255,255,.94);text-shadow:0 1px 10px rgba(0,0,0,.5)}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.btn{display:inline-block;font-family:var(--font-head);font-weight:700;font-size:16px;padding:12px 28px;border-radius:8px;cursor:pointer;transition:transform .15s, box-shadow .15s, background .15s, color .15s}
.btn-main{background:var(--sub);color:#231600;border:2px solid var(--sub);box-shadow:0 5px 16px rgba(0,0,0,.28)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 9px 22px rgba(0,0,0,.36)}
.btn-ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.7)}
.btn-ghost:hover{background:#fff;color:var(--brand-deep)}

/* ---------- 5. 信頼バッジ帯 ---------- */
.facts{background:var(--brand-deep);padding:0}
.facts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.fact{text-align:center;padding:26px 14px;color:#fff;border-left:1px solid rgba(255,255,255,.14)}
.fact:first-child{border-left:0}
.fact-num{display:block;font-family:var(--font-head);font-size:clamp(20px,2.4vw,26px);font-weight:900;color:var(--em)}
.fact-label{display:block;font-size:13px;color:rgba(255,255,255,.85);margin-top:4px}

/* ---------- 6. 私たちについて ---------- */
.about{background:var(--bg-alt)}
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,60px);align-items:center}
.about-text h2{text-align:left;margin-top:6px}
.about-text .lead{font-size:calc(19px*var(--fz,1));font-weight:700;color:var(--brand-deep);margin:8px 0 14px}
.about-text p{font-size:calc(16px*var(--fz,1));margin-bottom:14px}
.about-photo img{width:100%;border-radius:10px;box-shadow:0 12px 30px rgba(18,58,110,.16);background:#fff}
.about-photo figcaption{font-size:13px;color:#8a9099;margin-top:12px;text-align:center}

/* ---------- 7. 事業内容（グリッド） ---------- */
.service{background:var(--bg-main)}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.svc-card{background:var(--bg-alt);border:1px solid var(--line);border-top:3px solid var(--brand);border-radius:8px;padding:22px 18px}
.svc-card h3{font-family:var(--font-head);font-size:17px;font-weight:800;color:var(--brand-deep);margin-bottom:8px}
.svc-card p{font-size:calc(14px*var(--fz,1));line-height:1.8;color:#4c5866}

/* ---------- 8. 施工実績 ---------- */
.works{background:var(--bg-alt)}
.works-list{list-style:none;max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.works-list li{display:flex;align-items:center;gap:16px;background:var(--bg-main);border:1px solid var(--line);border-left:4px solid var(--sub);border-radius:8px;padding:16px 20px}
.work-tag{flex:none;background:var(--badge);color:#fff;font-size:12px;font-weight:700;padding:4px 10px;border-radius:4px;min-width:88px;text-align:center}
.work-name{font-size:calc(15.5px*var(--fz,1));font-weight:700;color:var(--brand-deep)}
.works-note{max-width:860px;margin:20px auto 0;font-size:13px;color:#8a9099;text-align:center}
/* 施工写真事例：横スライド枠 */
.works-photos{max-width:1080px;margin:40px auto 0}
.works-photos-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.works-photos-head h3{font-family:var(--font-head);font-size:18px;font-weight:800;color:var(--brand-deep)}
.wp-arrows{display:flex;gap:8px}
.wp-arrows button{width:38px;height:38px;border-radius:50%;border:1.5px solid var(--line);background:var(--bg-alt);color:var(--brand-deep);font-size:20px;line-height:1;cursor:pointer;transition:.15s}
.wp-arrows button:hover{background:var(--brand);color:#fff;border-color:var(--brand)}
.works-slider{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;padding-bottom:10px}
.works-slider::-webkit-scrollbar{height:8px}
.works-slider::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}
.work-photo{flex:0 0 clamp(240px,30%,300px);scroll-snap-align:start;margin:0}
.wp-frame{aspect-ratio:4/3;border-radius:8px;border:1px dashed #b3c0d1;background:linear-gradient(135deg,#eef2f7,#e2e8f1);display:flex;align-items:center;justify-content:center}
.wp-frame span{font-family:var(--font-head);font-size:14px;font-weight:700;color:#9fadbf;letter-spacing:.08em;border:1px solid #c3cedb;border-radius:4px;padding:4px 12px}
.work-photo figcaption{font-size:13.5px;font-weight:700;color:var(--brand-deep);margin-top:10px;text-align:center}
.wp-hint{text-align:center;font-size:12px;color:#a7b3c4;margin-top:8px}

/* ---------- 9. 選ばれる理由 ---------- */
.strength{background:var(--bg-main)}
.str-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.str-card{background:var(--bg-alt);border-radius:8px;border-top:3px solid var(--sub);padding:26px 20px;box-shadow:0 6px 18px rgba(18,58,110,.06)}
.str-num{font-family:var(--font-head);font-size:26px;font-weight:900;color:var(--sub);line-height:1}
.str-card h3{font-family:var(--font-head);font-size:18px;font-weight:800;color:var(--brand-deep);margin:8px 0}
.str-card p{font-size:calc(14.5px*var(--fz,1));line-height:1.85}

/* ---------- 10. 会社概要 ---------- */
.company{background:var(--bg-alt)}
.company-table{width:100%;max-width:860px;margin:0 auto;border-collapse:collapse}
.company-table th,.company-table td{border-bottom:1px solid var(--line);padding:14px 12px;text-align:left;font-size:calc(15px*var(--fz,1));vertical-align:top}
.company-table th{width:150px;color:var(--brand-deep);font-weight:800;white-space:nowrap}
.map-wrap{max-width:860px;margin:26px auto 0;border-radius:8px;overflow:hidden;border:1px solid var(--line)}
.map-wrap iframe{width:100%;height:300px;border:0;display:block}

/* ---------- 11. お問い合わせ ---------- */
.contact{background:var(--bg-main);text-align:center}
.tel-box{background:var(--bg-alt);border:2px solid var(--brand-deep);border-radius:10px;max-width:460px;margin:0 auto 28px;padding:20px}
.tel-box .label{font-size:15px;color:var(--brand-deep);font-weight:700;letter-spacing:.06em}
.tel-box a{display:block;font-family:var(--font-head);font-size:34px;font-weight:900;color:var(--brand-deep);margin:4px 0}
.tel-box .sub{font-size:14px;color:#6a7480}
.contact-form{max-width:560px;margin:0 auto;background:var(--bg-alt);border-radius:10px;padding:24px;text-align:left;border:1px solid var(--line)}
.contact-form label{display:block;font-size:14px;font-weight:700;color:var(--brand-deep);margin-bottom:14px}
.f-row{display:flex;gap:14px}.f-row label{flex:1}
.contact-form input,.contact-form textarea{display:block;width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--bg-main);font-family:inherit;font-size:15px;font-weight:400;color:var(--ink)}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--brand);border-color:var(--brand);background:#fff}
.contact-form .btn-main{width:100%;border:none;margin-top:4px;color:#231600}
.form-note{font-size:13px;color:#6a7480;margin-top:12px;text-align:center}
.form-note.sent{color:var(--brand-deep);font-weight:700}

/* ---------- 12. フッター ---------- */
footer{background:var(--brand-deep);color:#cfd6de;text-align:center;padding:32px 16px;font-size:14px;line-height:1.8;transition:background .4s}
footer .foot-note{max-width:780px;margin:12px auto 0;font-size:12px;opacity:.72}
.sp-call{display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;background:var(--sub);color:#231600;text-align:center;font-family:var(--font-head);font-weight:800;font-size:16px;padding:13px 10px;box-shadow:0 -3px 14px rgba(0,0,0,.2)}

/* ---------- 13. レスポンシブ ---------- */
@media (max-width:900px){
  .facts-grid{grid-template-columns:1fr 1fr}
  .fact:nth-child(3){border-left:0}
  .svc-grid{grid-template-columns:1fr 1fr}
  .str-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  nav,.header-tel{display:none}
  .menu-btn{display:inline-flex;align-items:center;gap:8px;margin-left:auto;background:none;border:1.5px solid var(--line);border-radius:8px;font-family:inherit;font-weight:700;color:var(--brand-deep);padding:8px 12px;cursor:pointer}
  .menu-bars{display:inline-block;width:18px;height:14px;position:relative}
  .menu-bars span{display:block;width:18px;height:2px;background:currentColor;border-radius:2px;position:absolute;left:0}
  .menu-bars span:nth-child(1){top:0}.menu-bars span:nth-child(2){top:6px}.menu-bars span:nth-child(3){top:12px}
  #siteNav{display:none}
  body.nav-open #siteNav{display:block;position:fixed;top:0;right:0;bottom:0;width:74%;max-width:300px;z-index:70;background:var(--bg-alt);border-left:1px solid var(--line);padding:76px 24px;box-shadow:-8px 0 24px rgba(0,0,0,.15)}
  body.nav-open #siteNav ul{flex-direction:column;gap:4px;margin:0}
  body.nav-open nav a{display:block;padding:12px 4px;border-bottom:1px solid var(--line)}
  .hero{min-height:0;display:block}
  .hero-media{position:relative;height:40vh;min-height:230px}
  .hero-scrim{background:linear-gradient(180deg, rgba(10,30,60,.35) 0%, rgba(10,30,60,.7) 100%)}
  .hero-inner{padding:28px 22px 8px}
  .hero-h1{font-size:clamp(28px,8vw,38px)}
  .about-grid{grid-template-columns:1fr;gap:30px}
  .works-list li{flex-direction:column;align-items:flex-start;gap:8px}
  .company-table th{width:116px}
  .sp-call{display:block}
  footer{padding-bottom:70px}
}
@media (max-width:520px){
  .facts-grid{grid-template-columns:1fr 1fr}
  .svc-grid{grid-template-columns:1fr}
  .str-grid{grid-template-columns:1fr}
  .f-row{flex-direction:column;gap:0}
}