/* =============================================================
   landing.css — キーワード専用ランディングページ共通スタイル
   reform.html / carport.html / newbuild.html で共有
   既存ページ（about/works）と同じ配色・トーンに統一
   ============================================================= */
:root{
  --cream:#faf8f5;--white:#fff;--warm-50:#f5f0eb;--warm-100:#e8e0d8;--warm-200:#d4c8ba;
  --warm-600:#7a6b5d;--warm-700:#5c4f43;--warm-800:#3d3429;--warm-900:#2a231b;
  --accent:#8b7355;--accent-light:#b09a7c;
  --shadow-sm:0 1px 3px rgba(0,0,0,.06);--shadow-md:0 4px 20px rgba(0,0,0,.08);
  --radius:0;--radius-lg:0;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans JP",system-ui,sans-serif;color:var(--warm-800);background:var(--cream);line-height:1.8;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:min(1140px,90vw);margin:0 auto}

/* Header */
.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(250,248,245,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,.06);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.08)}
.header__inner{display:flex;align-items:center;justify-content:space-between;padding:16px 0;gap:16px}
.brand{display:flex;align-items:center;gap:12px}
.brand__main{font-family:"Noto Serif JP",serif;font-size:22px;font-weight:700;color:var(--warm-900);letter-spacing:.06em}
.brand__sub{font-size:11px;font-weight:500;color:var(--accent);letter-spacing:.12em;border:1px solid var(--warm-100);padding:4px 12px;border-radius:0}
.nav{display:flex;align-items:center;gap:6px}
.nav a{font-size:14px;font-weight:500;color:var(--warm-600);padding:8px 16px;border-radius:0;transition:all .2s}
.nav a:hover{color:var(--warm-900);background:rgba(0,0,0,.04)}
.nav a[aria-current="page"]{color:var(--warm-900);font-weight:700}
.nav__cta{background:transparent!important;color:inherit!important;font-weight:inherit!important;padding:8px 16px!important;border-radius:0!important}
.hamburger{display:none;background:none;border:none;cursor:pointer;width:32px;height:32px;position:relative}
.hamburger span{display:block;width:20px;height:2px;background:var(--warm-800);border-radius:0;position:absolute;left:6px;transition:all .3s}
.hamburger span:nth-child(1){top:9px}
.hamburger span:nth-child(2){top:15px}
.hamburger span:nth-child(3){top:21px}
@media(max-width:768px){
  .hamburger{display:block}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--white);flex-direction:column;padding:16px;border-bottom:1px solid var(--warm-100);box-shadow:var(--shadow-md)}
  .nav.open{display:flex}
  .nav a{width:100%;text-align:center;padding:14px;font-size:16px}
}

/* Breadcrumb */
.breadcrumb{margin-top:68px;background:var(--white);border-bottom:1px solid var(--warm-100)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:12px 0;font-size:12px;color:var(--warm-600)}
.breadcrumb a{color:var(--accent)}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb li::after{content:'›';margin-left:6px;color:var(--warm-200)}
.breadcrumb li:last-child::after{content:''}

/* Page hero */
.page-hero{padding:56px 0 48px;background:var(--white);border-bottom:1px solid var(--warm-100)}
.page-hero__label{font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--accent);margin-bottom:12px}
.page-hero__title{font-family:"Noto Serif JP",serif;font-size:clamp(26px,4.2vw,38px);font-weight:700;letter-spacing:.03em;margin-bottom:16px;line-height:1.4}
.page-hero__lead{font-size:15px;color:var(--warm-600);max-width:680px}
.page-hero__cta{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}

/* Sections */
.section{padding:64px 0}
.section--white{background:var(--white)}
.section__header{margin-bottom:36px}
.section__label{display:inline-block;font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--accent);margin-bottom:10px}
.section__title{font-family:"Noto Serif JP",serif;font-size:clamp(21px,3.2vw,27px);font-weight:700;letter-spacing:.03em}
.section__lead{max-width:720px;margin:14px 0 0;font-size:15px;color:var(--warm-700);line-height:2}

/* Feature/service grid */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:820px){.feature-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.feature-grid{grid-template-columns:1fr}}
.feature-card{background:var(--white);border:1px solid var(--warm-100);border-radius:0;padding:26px 22px;box-shadow:var(--shadow-sm);transition:all .3s}
.section--white .feature-card{background:var(--cream)}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.feature-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feature-card p{font-size:13px;color:var(--warm-600);line-height:1.9}

/* Value cards (numbered) */
.values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media(max-width:768px){.values-grid{grid-template-columns:1fr}}
.value-card{background:var(--white);border:1px solid var(--warm-100);border-radius:0;padding:30px 24px;box-shadow:var(--shadow-sm)}
.section--white .value-card{background:var(--cream)}
.value-card__num{font-family:"Noto Serif JP",serif;font-size:30px;font-weight:700;color:var(--warm-100);margin-bottom:10px}
.value-card h3{font-size:17px;font-weight:700;margin-bottom:10px}
.value-card p{font-size:14px;color:var(--warm-600);line-height:1.9}

/* Steps */
.steps{display:grid;gap:16px;max-width:760px}
.step{display:grid;grid-template-columns:56px 1fr;gap:18px;align-items:start;background:var(--white);border:1px solid var(--warm-100);border-radius:0;padding:20px 22px}
.section--white .step{background:var(--cream)}
.step__num{font-family:"Noto Serif JP",serif;font-size:24px;font-weight:700;color:var(--accent);text-align:center}
.step h3{font-size:16px;font-weight:700;margin-bottom:4px}
.step p{font-size:13px;color:var(--warm-600);line-height:1.8}

/* Related works link */
.related{display:grid;grid-template-columns:1.4fr 1fr;gap:28px;align-items:center;background:var(--white);border:1px solid var(--warm-100);border-radius:0;padding:28px;box-shadow:var(--shadow-sm)}
.section--white .related{background:var(--cream)}
@media(max-width:720px){.related{grid-template-columns:1fr}}
.related__imgs{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.related__imgs img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:0}
.related h3{font-size:18px;font-weight:700;margin-bottom:8px}
.related p{font-size:14px;color:var(--warm-600);margin-bottom:16px;line-height:1.9}

/* FAQ */
.faq{display:grid;gap:12px;max-width:820px}
.faq details{background:var(--white);border:1px solid var(--warm-100);border-radius:0;padding:0 20px;box-shadow:var(--shadow-sm)}
.section--white .faq details{background:var(--cream)}
.faq summary{list-style:none;cursor:pointer;font-size:15px;font-weight:700;padding:18px 0;position:relative;padding-right:32px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';position:absolute;right:4px;top:16px;font-size:20px;color:var(--accent);transition:transform .2s}
.faq details[open] summary::after{content:'−'}
.faq summary + *{padding-bottom:18px}
.faq p{font-size:14px;color:var(--warm-600);line-height:1.9}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:14px;font-weight:700;padding:14px 28px;border-radius:0;border:none;cursor:pointer;transition:all .25s;letter-spacing:.02em}
.btn--primary{background:var(--warm-900);color:#fff}
.btn--primary:hover{background:var(--warm-700);transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn--ghost{background:transparent;color:var(--warm-700);border:1px solid var(--warm-200)}
.btn--ghost:hover{border-color:var(--accent)}
.btn--light{background:#fff;color:var(--warm-900)}
.btn--light:hover{background:var(--warm-50);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.15)}
.btn--outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.btn--outline:hover{border-color:#fff;background:rgba(255,255,255,.1)}

/* CTA band */
.cta-band{background:var(--warm-900);padding:56px 0;text-align:center;color:#fff}
.cta-band h2{font-family:"Noto Serif JP",serif;font-size:clamp(20px,3vw,26px);font-weight:700;margin-bottom:10px}
.cta-band p{color:rgba(255,255,255,.7);font-size:14px;margin-bottom:28px}
.btn-group{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* Footer */
.footer{background:var(--warm-900);color:rgba(255,255,255,.5);padding:36px 0 28px;font-size:13px}
.footer__nav{display:flex;gap:20px;flex-wrap:wrap;justify-content:center;margin-bottom:20px}
.footer__nav a{color:rgba(255,255,255,.65);transition:color .2s}
.footer__nav a:hover{color:#fff}
.footer__copy{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;gap:16px}
.footer__copy a{opacity:.5;display:inline-flex}

/* Fade-in on scroll */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}
@media(prefers-reduced-motion:reduce){.fade-up{opacity:1;transform:none;transition:none}}

@media(max-width:480px){
  .brand__main{font-size:18px}
  .brand__sub{font-size:10px;padding:3px 8px}
  .section{padding:44px 0}
  .page-hero{padding:40px 0 32px}
}