/* ==========================================================================
   共通スタイル - 岩淵工務店リニューアル
   ========================================================================== */
:root{
  --brand:#00c4c4; --brand-2:#174b3f; --accent:#aaeeee;
  --bg:#f7f7f5; --ink:#111827; --muted:#6b7280;
  --radius:16px; --shadow:0 10px 30px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:"Noto Sans JP",system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";color:var(--ink);background:var(--bg);line-height:1.6}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}

.container{width:min(1100px,92vw);margin-inline:auto}
.grid{display:grid;gap:clamp(14px,2.6vw,28px)}
.section{padding:clamp(26px,4vw,55px) 0}
.surface{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.title{font-family:"Noto Serif JP",serif;line-height:1.25;}
.muted{color:var(--muted)}
.center{display:grid;place-items:center}
.mt-2{margin-top:.5rem}.mt-3{margin-top:.75rem}.mt-4{margin-top:1rem}
.mt-6{margin-top:1.5rem}.mt-8{margin-top:2rem}
.mb-0{margin-bottom:0}

.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 1.2rem;border-radius:999px;font-weight:700;letter-spacing:.02em;border:1px solid transparent;box-shadow:var(--shadow);transition:.2s ease}
.btn--primary{background:var(--brand);color:#fff}
.btn--primary:hover{background:var(--brand-2)}
.btn--ghost{background:transparent;border-color:#cbd5e1;color:var(--brand)}
.tag{display:inline-block;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;background:#e8efe9;color:var(--brand);padding:.35rem .7rem;border-radius:999px}

header{position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(8px);background:linear-gradient(to bottom,rgba(247,247,245,.85),rgba(247,247,245,.55));border-bottom:1px solid rgba(0,0,0,.05)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:.65rem 0;gap:8px}
/* ロゴ・会社名：絶対に縮まない */
.brand{display:flex;align-items:center;gap:.65rem;font-weight:800;flex-shrink:0;min-width:0;text-decoration:none}
.brand-logo{width:36px;height:36px;flex-shrink:0;border-radius:10px;background:conic-gradient(from 30deg,var(--accent),#00c4c4,var(--accent));display:grid;place-items:center;box-shadow:var(--shadow)}
.brand-logo svg{width:20px;height:20px;color:#1b2b25}
.brand-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* ナビ右側エリア */
.lp-nav{display:flex;align-items:center;gap:.5rem;flex-shrink:0}
/* 常時表示リンク：640px以上のみ */
.nav-links-main{display:none;gap:.5rem;align-items:center}
@media(min-width:640px){.nav-links-main{display:flex}}
.nav-links-main a{padding:.4rem .55rem;border-radius:8px;font-size:.88rem;white-space:nowrap}
.nav-links-main a:hover{background:#e8efe9}
/* ハンバーガーボタン */
.hamburger-btn{display:inline-flex;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;gap:5px;background:transparent;border:1px solid #cbd5e1;border-radius:10px;cursor:pointer;padding:0;flex-shrink:0;transition:background .15s}
.hamburger-btn:hover{background:#e8efe9}
.bar{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s ease,opacity .2s ease}
.hamburger-btn[aria-expanded="true"] .bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger-btn[aria-expanded="true"] .bar:nth-child(2){opacity:0;transform:scaleX(0)}
.hamburger-btn[aria-expanded="true"] .bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* ドロップダウンパネル */
.nav-links{display:none;position:fixed;z-index:60;flex-direction:column;gap:2px;padding:8px;background:#fff;border:1px solid #e5e7eb;border-radius:14px;box-shadow:var(--shadow);max-height:min(70vh,480px);overflow-y:auto;top:60px;right:12px;left:auto;bottom:auto;width:min(260px,calc(100vw - 24px))}
.nav-links.show{display:flex}
/* リンク共通 */
.nav-links a{padding:.55rem .8rem;border-radius:8px;text-align:left;font-size:.9rem;display:block;position:relative}
.nav-links a:hover{background:#e8efe9}
/* ページ内アンカーリンク（#始まり）：色付き＋↓アイコン */
.nav-links a[href^="#"]{color:var(--brand);padding-left:1.6rem}
.nav-links a[href^="#"]::before{content:"↓";position:absolute;left:.55rem;top:50%;transform:translateY(-50%);font-size:.72rem;opacity:.75}
/* 外部ページリンク */
.nav-links a:not([href^="#"]){color:var(--ink)}
/* セクションラベル・区切り線 */
.nav-label{display:block;font-size:.7rem;font-weight:700;color:var(--muted);letter-spacing:.1em;padding:.5rem .8rem .15rem;text-transform:uppercase}
.nav-sep{border:none;border-top:1px solid #f1f5f9;margin:4px 0}
@media(min-width:1100px){
  .nav-links{top:66px;right:max(12px,calc((100vw - 1100px)/2 + 12px))}
}

.hero{position:relative;isolation:isolate;overflow:clip;background:#fff}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-2;
  background:var(--hero, url('../images/top_image.jpg')) 64% center/cover no-repeat;
  filter:saturate(1.08) brightness(1.03) contrast(1.02);
}
/* 全体の白膜は薄くし、可読性はテキストパネル側で担保 */
.hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    linear-gradient(180deg, rgba(255,255,255,.06) 0%, rgba(255,255,255,.18) 100%);
}
@media (max-width: 780px) {
  .hero::before{ background-position: 58% center; }
  .hero::after{
    background:
      linear-gradient(180deg, rgba(255,255,255,.10) 0%, rgba(255,255,255,.34) 42%, rgba(255,255,255,.72) 76%, rgba(255,255,255,.82) 100%);
  }
}
.hero-inner{padding:clamp(64px,9vw,140px) 0;color:var(--ink)}
.hero h1{font-size:clamp(1.8rem,3.8vw,3.1rem);margin:0 0 10px;color:var(--ink)}
.hero p{max-width:64ch;color:#1f2937;opacity:1}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
.trust{margin-top:22px;display:flex;gap:16px;flex-wrap:wrap}
.trust .chip{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);color:#fff;padding:.4rem .7rem;border-radius:999px;font-size:.9rem}

.services-grid{grid-template-columns:repeat(12,1fr)}
.service-card{grid-column:span 4;background:#fff;border-radius:18px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.service-card img{aspect-ratio:4/3;object-fit:cover}
.service-card .content{padding:16px 16px 18px}
.service-card h3{margin:0 0 6px}
.service-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.service-tags span{font-size:.8rem;background:#f1f5f9;color:#334155;padding:.25rem .5rem;border-radius:999px}
@media (max-width:980px){.service-card{grid-column:span 6}}
@media (max-width:640px){.service-card{grid-column:span 12}}

.works-grid{grid-template-columns:repeat(12,1fr)}
.work{grid-column:span 4;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:#fff}
.work figure{margin:0}
.work img{aspect-ratio:4/3;object-fit:cover}
.work figcaption{padding:12px 14px;font-size:.95rem}
.work figcaption .work-title{margin:0 0 4px;font-size:1.05rem;line-height:1.35;font-weight:700}
.work figcaption .work-desc{margin:0;font-size:.92rem;color:var(--muted)}
@media (max-width:980px){.work{grid-column:span 6}}
@media (max-width:640px){.work{grid-column:span 12}}

.value{grid-template-columns:1.1fr 1fr}
.check{display:flex;align-items:flex-start;gap:12px}
.check i{width:26px;height:26px;border-radius:999px;background:#e8efe9;color:var(--brand);display:grid;place-items:center;font-weight:900}
@media (max-width:880px){.value{grid-template-columns:1fr}}

.steps{grid-template-columns:repeat(6,1fr)}
.step{grid-column:span 2;background:#fff;border-radius:16px;padding:16px;box-shadow:var(--shadow)}
.step small{display:block;color:var(--muted)}
@media (max-width:1000px){.step{grid-column:span 3}}
@media (max-width:600px){.step{grid-column:span 6}}

details{background:#fff;border-radius:14px;padding:14px 16px;box-shadow:var(--shadow)}
details+details{margin-top:14px}
summary{cursor:pointer;font-weight:700}

.grid-2col{grid-template-columns:1.2fr 1fr}
@media (max-width:768px){.grid-2col{grid-template-columns:1fr}}

form{display:grid;gap:14px}
.field{display:grid;gap:8px}
.field label{font-weight:600}
.field input,.field select,.field textarea{padding:12px 12px;border-radius:12px;border:1px solid #e5e7eb;background:#fff;font:inherit}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid #bfd5ca;border-color:#bfd5ca}
.field input::placeholder,.field textarea::placeholder{color:#b0b8c1}
#contact form{width:100%}
#contact form .field{min-width:0}
#contact form input,#contact form select,#contact form textarea{width:100%;max-width:100%}
#contact form input[type="checkbox"],#contact form input[type="radio"]{width:auto}
@media (max-width:768px){
  #contact form .grid{grid-template-columns:1fr !important;gap:12px}
  #contact form input,#contact form select,#contact form textarea{font-size:16px}
}
#contact form .consent-row{display:flex;align-items:flex-start;gap:.5rem;grid-column:1/-1;min-width:0;flex-wrap:wrap}
#contact form .consent-row input{flex:0 0 auto;margin-top:.2rem}
#contact form .consent-row span{flex:1 1 0;min-width:0;white-space:normal;word-break:break-word}
#contact form .btn--primary{font-size:1.1rem;padding:1rem 1.4rem}

footer{padding:28px 0;border-top:1px solid #e5e7eb;color:#475569}

/* Lightbox */
.lb-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);display:none;align-items:center;justify-content:center;z-index:9999}
.lb-overlay.show{display:flex}
.lb-stage{position:relative;max-width:92vw;max-height:92vh;display:grid;place-items:center}
.lb-img{max-width:92vw;max-height:82vh;border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lb-controls{position:absolute;inset:0;display:flex;align-items:center;justify-content:space-between;pointer-events:none}
.lb-btn{pointer-events:auto;user-select:none;display:grid;place-items:center;width:44px;height:44px;border-radius:999px;background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.3);backdrop-filter:blur(6px);cursor:pointer}
.lb-btn:focus{outline:2px solid #a7f3d0}
.lb-prev{position:absolute;left:-56px}
.lb-next{position:absolute;right:-56px}
.lb-close{position:absolute;top:-56px;right:0}
@media (max-width:640px){
  .lb-prev{left:8px}.lb-next{right:8px}.lb-close{top:8px;right:8px}
}

/* フォームアラート */
#formAlert{margin-top:14px;padding:16px 18px;border-radius:12px;font-weight:700;font-size:1.05rem}
.form-alert--info{background:#f1f5f9;color:#0f172a;border:1px solid #e2e8f0}
.form-alert--success{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.form-alert--error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}

/* ===== KPI strip ============================ */
.kpis{
  display:flex;
  gap:24px;
  flex-wrap:wrap;
  margin:12px 0 0;
}
.kpi{
  flex:1 1 140px;
  background:#fff;
  border-radius:14px;
  padding:18px 16px;
  text-align:center;
  box-shadow:0 10px 30px rgba(0,0,0,.08);
  border:1px solid rgba(0,0,0,.04);
}
.kpi strong{
  display:block;
  font-size:1.6rem;
  line-height:1.2;
  margin-bottom:4px;
}
.kpi .muted{
  color:#6b7280;
  font-size:.95rem;
}

@media (max-width:640px){
  .kpis{ gap:16px; }
  .kpi{ padding:16px 14px; }
  .kpi strong{ font-size:1.4rem; }
}

@media (max-width: 640px){
  .kpis{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .kpi{
    flex: initial;
    width: auto;
  }
}

@media (max-width: 768px){
  .kpis{
    display:grid !important;
    grid-template-columns:repeat(2, minmax(0,1fr));
    gap:16px;
  }
  .kpi{ flex:initial; width:auto; }
}

/* === Adapter: page-specific classes ================== */
.plans{ display:grid; grid-template-columns:repeat(12, 1fr); gap:clamp(14px,2.6vw,28px); }
.plan{ grid-column:span 4; background:#fff; border-radius:18px; overflow:hidden; box-shadow:var(--shadow); display:flex; flex-direction:column; }
.plan img{ aspect-ratio:4/3; object-fit:cover; }
.plan .content{ padding:16px 16px 18px; }
.plan h3{ margin:0 0 6px; }
.price{ font-weight:800; }
@media (max-width:980px){ .plan{ grid-column:span 6; } }
@media (max-width:640px){ .plan{ grid-column:span 12; } }

.voices{ display:grid; grid-template-columns:repeat(12,1fr); gap:clamp(14px,2.6vw,28px); }
.voice{ grid-column:span 6; background:#fff; border-radius:16px; padding:16px; box-shadow:var(--shadow); }
@media (max-width:800px){ .voice{ grid-column:span 12; } }

.banner{
  position:relative; overflow:hidden; border-radius:18px;
  background:linear-gradient(135deg, var(--brand-2), var(--brand));
  color:#fff; padding:22px 18px; box-shadow:var(--shadow);
}

/* ===== スクロールフェードイン ===== */
.scroll-fade-in{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .6s ease-out, transform .6s ease-out;
}
.scroll-fade-in.is-visible{
  opacity:1;
  transform:translateY(0);
}
/* 子要素の遅延（サービスカード・施工実績など） */
.scroll-fade-in .service-card,
.scroll-fade-in .work,
.scroll-fade-in .kpi,
.scroll-fade-in .step{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .5s ease-out, transform .5s ease-out;
}
.scroll-fade-in.is-visible .service-card,
.scroll-fade-in.is-visible .work,
.scroll-fade-in.is-visible .kpi,
.scroll-fade-in.is-visible .step{
  opacity:1;
  transform:translateY(0);
}
.scroll-fade-in .service-card:nth-child(1){ transition-delay:.05s }
.scroll-fade-in .service-card:nth-child(2){ transition-delay:.1s }
.scroll-fade-in .service-card:nth-child(3){ transition-delay:.15s }
.scroll-fade-in .service-card:nth-child(4){ transition-delay:.2s }
.scroll-fade-in .service-card:nth-child(5){ transition-delay:.25s }
.scroll-fade-in .service-card:nth-child(6){ transition-delay:.3s }
.scroll-fade-in .work:nth-child(1){ transition-delay:.05s }
.scroll-fade-in .work:nth-child(2){ transition-delay:.1s }
.scroll-fade-in .work:nth-child(3){ transition-delay:.15s }
.scroll-fade-in .kpi:nth-child(1){ transition-delay:.05s }
.scroll-fade-in .kpi:nth-child(2){ transition-delay:.1s }
.scroll-fade-in .kpi:nth-child(3){ transition-delay:.15s }
.scroll-fade-in .kpi:nth-child(4){ transition-delay:.2s }
.scroll-fade-in .step:nth-child(1){ transition-delay:.05s }
.scroll-fade-in .step:nth-child(2){ transition-delay:.1s }
.scroll-fade-in .step:nth-child(3){ transition-delay:.15s }
.scroll-fade-in .step:nth-child(4){ transition-delay:.2s }
.scroll-fade-in .step:nth-child(5){ transition-delay:.25s }
.scroll-fade-in .step:nth-child(6){ transition-delay:.3s }

@media (prefers-reduced-motion: reduce){
  .scroll-fade-in,.scroll-fade-in .service-card,.scroll-fade-in .work,.scroll-fade-in .kpi,.scroll-fade-in .step{
    opacity:1; transform:none; transition:none;
  }
}