@charset "UTF-8";
/* ============================================================
   堤電気 提案見本 スタイルシート（型B・刷新）
   構成：1.テーマ変数 2.リセット 3.注釈バー/切替帯/ヘッダー
   4.ヒーロー（斜め2トーン：左パネル＋写真スライド）
   5.私たち 6.事業内容（個人/法人）7.強み 8.施工事例 9.会社概要
   10.お問い合わせ 11.フッター 12.レスポンシブ
   配色は太陽光×インフラ電工：A空×陽／B杜×陽／C鉄×黄
   ============================================================ */

/* ---------- 1. テーマ変数 ---------- */
body.theme-a{
  --ink:#213040;
  --brand:#1466b0;        /* 空の青 */
  --brand-deep:#0d3f6e;
  --bg-main:#f2f6fb;
  --bg-alt:#ffffff;
  --line:#dbe4ef;
  --sub:#f2a516;          /* 太陽の橙 */
  --em:#ffc861;
  --badge:rgba(13,63,110,.85);
  --font-head:"Zen Kaku Gothic New",sans-serif;
  --head-weight:800;
}
body.theme-b{
  --ink:#233329;
  --brand:#2f7d4f;        /* 杜の緑 */
  --brand-deep:#1f5637;
  --bg-main:#f3f7f1;
  --bg-alt:#ffffff;
  --line:#dde7dc;
  --sub:#e0a41c;          /* 実りの金 */
  --em:#f5cf6b;
  --badge:rgba(31,86,55,.85);
  --font-head:"Zen Kaku Gothic New",sans-serif;
  --head-weight:800;
}
body.theme-c{
  --ink:#252a31;
  --brand:#3a4656;        /* 鉄塔のスチール */
  --brand-deep:#252d3a;
  --bg-main:#f4f5f7;
  --bg-alt:#ffffff;
  --line:#e0e3e8;
  --sub:#eec200;          /* 安全標識の黄 */
  --em:#ffe15a;
  --badge:rgba(37,45,58,.85);
  --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:.1em;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:40em;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:#4a4f57;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,#0d3f6e 55%,#f2a516 55%)}
.dot-b{background:linear-gradient(135deg,#1f5637 55%,#e0a41c 55%)}
.dot-c{background:linear-gradient(135deg,#252d3a 55%,#eec200 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:22px}
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（斜め2トーン） ---------- */
.hero{
  position:relative;overflow:hidden;padding:0;
  min-height:var(--hero-h,80vh);
  display:flex;align-items:stretch;
}
.hero-media{position:absolute;inset:0;z-index:0;overflow:hidden;background:#0d1b2a}
.hero-video-wrap{position:absolute;inset:0;overflow:hidden}
.hero-video{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:100%;height:100%;border:0;
}
/* 16:9動画を器いっぱいにカバー（object-fit:cover相当） */
@media (min-aspect-ratio:16/9){.hero-video{height:300%}}
@media (max-aspect-ratio:16/9){.hero-video{width:300%}}
.hero-media::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg, rgba(8,14,24,.45) 0%, rgba(8,14,24,.12) 46%, rgba(8,14,24,0) 70%);}
.hero-panel{
  position:relative;z-index:1;
  width:min(620px,58%);
  background:linear-gradient(160deg, color-mix(in srgb,var(--brand-deep) 90%, transparent) 0%, color-mix(in srgb,var(--brand-deep) 82%, transparent) 100%);
  backdrop-filter:blur(2px);
  color:#fff;
  clip-path:polygon(0 0, 100% 0, calc(100% - 84px) 100%, 0 100%);
  padding:clamp(40px,6vw,72px) clamp(96px,9vw,128px) clamp(40px,6vw,72px) clamp(24px,5vw,64px);
  display:flex;flex-direction:column;justify-content:center;
}
.hero-eyebrow{
  font-family:var(--font-head);font-size:14px;letter-spacing:.08em;
  color:#fff;opacity:.9;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(34px,5vw,58px);line-height:1.25;letter-spacing:.01em;
}
.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,.92)}
.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 26px;border-radius:30px;cursor:pointer;
  transition:transform .15s, box-shadow .15s, background .15s, color .15s;
}
.btn-main{background:var(--sub);color:#1e1300;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)}
.scroll-cue{
  position:absolute;bottom:16px;right:6%;z-index:2;
  color:rgba(255,255,255,.9);font-size:12px;letter-spacing:.2em;
  font-family:var(--font-head);text-shadow:0 1px 8px rgba(0,0,0,.6);
}
.scroll-cue::after{
  content:"";display:block;width:1px;height:30px;margin:8px auto 0;
  background:linear-gradient(to bottom, rgba(255,255,255,.9), rgba(255,255,255,0));
  animation:cue 2.2s ease-in-out infinite;
}
@keyframes cue{0%,100%{opacity:.35}50%{opacity:1}}

/* ---------- 5. 私たち ---------- */
.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-name{font-family:var(--font-head);font-weight:800;color:var(--brand-deep);margin-top:6px}
.about-photo img{width:100%;border-radius:8px;box-shadow:12px 12px 0 var(--line)}
.about-photo figcaption{font-size:13px;color:#8a9099;margin-top:12px}

/* ---------- 6. 事業内容 ---------- */
.service{background:var(--bg-main)}
.svc-block{
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,52px);
  align-items:center;margin-top:44px;
}
.svc-block.reverse .svc-photo{order:2}
.svc-photo img{width:100%;border-radius:8px;box-shadow:0 10px 26px rgba(20,40,70,.14)}
.svc-photo figcaption{font-size:13px;color:#8a9099;margin-top:10px}
.svc-tag{
  display:inline-block;background:var(--badge);color:#fff;
  font-size:14px;font-weight:700;padding:4px 14px;border-radius:4px;margin-bottom:12px;
}
.svc-body h3{font-family:var(--font-head);font-size:clamp(20px,2.4vw,26px);font-weight:var(--head-weight);color:var(--brand-deep);margin-bottom:10px}
.svc-body > p{font-size:calc(16px*var(--fz,1));margin-bottom:16px}
.svc-list{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.svc-list li{
  background:var(--bg-alt);border:1px solid var(--line);border-left:3px solid var(--sub);
  border-radius:5px;font-size:calc(15px*var(--fz,1));font-weight:700;
  color:var(--brand-deep);padding:7px 14px;
}

/* ---------- 7. 強み ---------- */
.strength{background:var(--bg-alt)}
.str-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.str-card{
  background:var(--bg-main);border-radius:8px;border-top:3px solid var(--sub);
  padding:26px 20px;
}
.str-num{font-family:var(--font-head);font-size:28px;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:10px 0 8px}
.str-card p{font-size:calc(14.5px*var(--fz,1));line-height:1.85}

/* ---------- 8. 施工事例 ---------- */
.works{background:var(--bg-main)}
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.work-item{margin:0;border-radius:8px;overflow:hidden;background:var(--bg-alt);box-shadow:0 8px 20px rgba(20,40,70,.12)}
.work-item img{width:100%;height:230px;object-fit:cover}
.work-item figcaption{font-size:14px;font-weight:700;color:var(--brand-deep);padding:12px 14px}

/* ---------- 9. 会社概要 ---------- */
.company{background:var(--bg-alt)}
.company-table{width:100%;max-width:820px;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:820px;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}

/* ---------- 10. 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:#1e1300}
.form-note{font-size:13px;color:#6a7480;margin-top:12px;text-align:center}
.form-note.sent{color:var(--brand-deep);font-weight:700}
.sns-follow{display:flex;justify-content:center;margin-top:26px}
.sns-ic{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:14px;box-shadow:0 3px 10px rgba(20,40,70,.18);transition:transform .15s, box-shadow .15s}
.sns-ic svg{width:27px;height:27px;fill:#fff}
.sns-ic:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(20,40,70,.3)}
.sns-fb{background:#1877f2}
.sns-x{background:#000}

/* ---------- 11. 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:760px;margin:12px auto 0;font-size:12px;opacity:.72}

/* スマホ固定電話ボタン */
.sp-call{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:var(--sub);color:#1e1300;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);
}

/* ---------- 12. レスポンシブ ---------- */
@media (max-width:900px){
  .str-grid{grid-template-columns:1fr 1fr}
  .works-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}
  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);
  }
  #siteNav{display:none}
  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-panel{
    width:100%;clip-path:none;
    padding:32px 22px 40px;
  }
  .hero-h1{font-size:clamp(30px,8.5vw,40px)}

  .about-grid{grid-template-columns:1fr;gap:30px}
  .about-photo img{box-shadow:8px 8px 0 var(--line)}
  .svc-block{grid-template-columns:1fr;gap:20px}
  .svc-block.reverse .svc-photo{order:1}
  .company-table th{width:112px}
  .sp-call{display:block}
  footer{padding-bottom:70px}
}
@media (max-width:520px){
  .str-grid{grid-template-columns:1fr}
  .works-grid{grid-template-columns:1fr}
  .f-row{flex-direction:column;gap:0}
}
@media (prefers-reduced-motion: reduce){
  .hero-bg{transition:none}
  .scroll-cue::after{animation:none}
}