/* ============================================
   豊田設計 — ダークモダン建築テーマ
   （我知野工務店風 / kasahara-town.com）
   ============================================ */
:root {
  --t-bg: #16181d;
  --t-bg2: #1d2027;
  --t-bg3: #23272f;
  --t-line: #33373f;
  --t-text: #e9eaec;
  --t-muted: #9aa0aa;
  --t-white: #ffffff;
  --t-accent: #c9a86a;      /* 金 — 親サイトとの繋がり */
  --t-accent-d: #a98a4e;
  --t-sans: 'Noto Sans JP', -apple-system, 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --t-serif: 'Noto Serif JP', serif;
  --t-cw: 1180px;
  --t-px: clamp(20px, 5vw, 56px);
}

.ty { background: var(--t-bg); color: var(--t-text); font-family: var(--t-sans); line-height: 1.85; -webkit-font-smoothing: antialiased; }
.ty * { box-sizing: border-box; }
.ty img { display: block; max-width: 100%; }
.ty a { color: inherit; text-decoration: none; }
.ty-container { max-width: var(--t-cw); margin: 0 auto; padding: 0 var(--t-px); }
.ty-eyebrow {
  font-size: 0.72rem; letter-spacing: 0.28em; color: var(--t-accent);
  text-transform: uppercase; margin: 0 0 14px; display: inline-block;
}
.ty-h2 {
  font-family: var(--t-serif); font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem); line-height: 1.35; margin: 0 0 8px; color: var(--t-white);
}
.ty-h2 .en { display:block; font-family: var(--t-sans); font-size:0.7rem; letter-spacing:0.2em; color:var(--t-muted); font-weight:400; margin-top:10px; }
.ty-lead { color: var(--t-muted); font-size: 0.98rem; margin: 0 0 40px; }

/* ---- Header ---- */
.ty-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--t-px); height: 68px;
  background: rgba(22,24,29,0.6); backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent; transition: background .3s, border-color .3s;
}
.ty-header.scrolled { background: rgba(22,24,29,0.95); border-color: var(--t-line); }
.ty-logo { display: flex; align-items: baseline; gap: 10px; }
.ty-logo b { font-family: var(--t-serif); font-size: 1.2rem; color: var(--t-white); letter-spacing: 0.06em; }
.ty-logo span { font-size: 0.62rem; letter-spacing: 0.2em; color: var(--t-muted); }
.ty-nav { display: flex; align-items: center; gap: 28px; }
.ty-nav a { font-size: 0.82rem; color: var(--t-text); position: relative; padding: 4px 0; }
.ty-nav a:hover { color: var(--t-accent); }
.ty-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--t-accent); color: #1a1a1a !important; font-weight: 600;
  font-size: 0.8rem; padding: 10px 20px; border-radius: 2px; transition: background .2s;
}
.ty-cta:hover { background: var(--t-accent-d); }
.ty-burger { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 6px; }
.ty-burger span { width: 24px; height: 2px; background: var(--t-text); transition: .3s; }

/* ---- Hero ---- */
.ty-hero { position: relative; min-height: 92vh; display: flex; align-items: flex-end; overflow: hidden; }
.ty-hero-img { position: absolute; inset: 0; }
.ty-hero-img img { width: 100%; height: 100%; object-fit: cover; }
.ty-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(22,24,29,0.55) 0%, rgba(22,24,29,0.2) 40%, rgba(22,24,29,0.9) 100%); }
.ty-hero-inner { position: relative; z-index: 2; width: 100%; max-width: var(--t-cw); margin: 0 auto; padding: 0 var(--t-px) clamp(56px, 9vw, 120px); }
.ty-hero-sub { font-size: 0.78rem; letter-spacing: 0.24em; color: var(--t-accent); margin: 0 0 18px; }
.ty-hero-title { font-family: var(--t-serif); font-weight: 900; color: var(--t-white); font-size: clamp(2.1rem, 6vw, 4.4rem); line-height: 1.25; margin: 0 0 20px; letter-spacing: 0.02em; }
.ty-hero-copy { color: var(--t-text); font-size: clamp(0.9rem, 2vw, 1.05rem); max-width: 540px; }
.ty-hero-scroll { position: absolute; right: var(--t-px); bottom: 40px; z-index: 2; writing-mode: vertical-rl; font-size: 0.65rem; letter-spacing: 0.3em; color: var(--t-muted); }

/* ---- Section base ---- */
.ty-sec { padding: clamp(64px, 9vw, 120px) 0; }
.ty-sec--alt { background: var(--t-bg2); }
.ty-sec--dark { background: #101216; }

/* ---- Concept ---- */
.ty-concept { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.ty-concept-photo { position: relative; }
.ty-concept-photo img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.ty-concept-photo::before { content: ""; position: absolute; inset: -14px -14px auto auto; width: 60%; height: 60%; border-top: 1px solid var(--t-accent); border-right: 1px solid var(--t-accent); opacity: .5; }
.ty-concept-body h2 { font-family: var(--t-serif); font-size: clamp(1.5rem,3vw,2.2rem); color: var(--t-white); line-height: 1.5; margin: 0 0 22px; }
.ty-concept-body p { color: var(--t-muted); font-size: 0.95rem; margin: 0 0 1.2em; }

/* ---- Works ---- */
.ty-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.ty-filter button {
  font-family: var(--t-sans); font-size: 0.78rem; color: var(--t-muted);
  background: transparent; border: 1px solid var(--t-line); border-radius: 2px;
  padding: 8px 18px; cursor: pointer; transition: .2s;
}
.ty-filter button:hover { color: var(--t-text); border-color: var(--t-muted); }
.ty-filter button.active { color: #1a1a1a; background: var(--t-accent); border-color: var(--t-accent); }
.ty-works { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ty-work {
  position: relative; overflow: hidden; background: var(--t-bg3);
  aspect-ratio: 4/3; cursor: pointer; display: block;
}
.ty-work img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.ty-work:hover img { transform: scale(1.06); }
.ty-work-cap {
  position: absolute; left: 0; bottom: 0; right: 0; padding: 30px 16px 14px 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.82)); color: #fff;
}
.ty-work-cat { display: block; font-size: 0.64rem; letter-spacing: 0.14em; color: var(--t-accent); margin-bottom: 4px; }
.ty-work-name { font-size: 0.86rem; font-weight: 500; line-height: 1.4; }
.ty-work.is-hidden { display: none; }

/* ---- Features (選ばれる理由) ---- */
.ty-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--t-line); border: 1px solid var(--t-line); }
.ty-feature { background: var(--t-bg); padding: 40px 30px; }
.ty-feature-no { font-family: var(--t-serif); font-size: 1.6rem; color: var(--t-accent); display: block; margin-bottom: 14px; }
.ty-feature h3 { font-size: 1.05rem; color: var(--t-white); margin: 0 0 12px; font-weight: 600; }
.ty-feature p { color: var(--t-muted); font-size: 0.88rem; margin: 0; line-height: 1.9; }

/* ---- Company ---- */
.ty-company { max-width: 820px; }
.ty-dl { border-top: 1px solid var(--t-line); }
.ty-dl > div { display: grid; grid-template-columns: 180px 1fr; gap: 20px; padding: 20px 4px; border-bottom: 1px solid var(--t-line); }
.ty-dl dt { color: var(--t-accent); font-size: 0.82rem; letter-spacing: 0.06em; margin: 0; }
.ty-dl dd { margin: 0; color: var(--t-text); font-size: 0.92rem; }

/* ---- FAQ ---- */
.ty-faq { max-width: 860px; }
.ty-faq-item { border-bottom: 1px solid var(--t-line); }
.ty-faq-q {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  display: flex; align-items: center; gap: 16px; padding: 24px 4px; color: var(--t-white);
  font-family: var(--t-serif); font-size: 1rem;
}
.ty-faq-q .mk { color: var(--t-accent); font-family: var(--t-serif); font-size: 1.1rem; flex-shrink: 0; }
.ty-faq-q .tgl { margin-left: auto; color: var(--t-muted); transition: transform .3s; font-size: 1.2rem; }
.ty-faq-item.open .tgl { transform: rotate(45deg); }
.ty-faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.ty-faq-a p { color: var(--t-muted); font-size: 0.9rem; line-height: 1.95; padding: 0 4px 24px 40px; margin: 0; }

/* ---- Contact CTA ---- */
.ty-contact { background: linear-gradient(135deg, #1c1f26, #101216); text-align: center; }
.ty-contact .ty-h2 { margin-bottom: 16px; }
.ty-contact p { color: var(--t-muted); margin: 0 auto 32px; max-width: 520px; }
.ty-contact-box { display: inline-block; border: 1px solid var(--t-line); padding: 28px 44px; border-radius: 2px; }
.ty-contact-box dt { color: var(--t-accent); font-size: 0.72rem; letter-spacing: 0.14em; }
.ty-contact-box dd { color: var(--t-white); font-size: 1.05rem; margin: 6px 0 0; }

/* ---- Footer ---- */
.ty-footer { background: #0d0f12; padding: 56px 0 28px; border-top: 1px solid var(--t-line); }
.ty-footer-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; flex-wrap: wrap; }
.ty-footer b { font-family: var(--t-serif); font-size: 1.15rem; color: var(--t-white); }
.ty-footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.ty-footer-links a { font-size: 0.8rem; color: var(--t-muted); }
.ty-footer-links a:hover { color: var(--t-accent); }
.ty-footer-copy { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--t-line); color: #6a6f78; font-size: 0.72rem; }

/* ---- Breadcrumb (dark) ---- */
.ty-crumb { padding: 84px 0 0; }
.ty-crumb .ty-container { font-size: 0.74rem; color: var(--t-muted); }
.ty-crumb a { color: var(--t-accent); }

/* ---- Lightbox ---- */
.ty-lb { position: fixed; inset: 0; background: rgba(0,0,0,0.92); z-index: 2000; display: none; align-items: center; justify-content: center; padding: 30px; }
.ty-lb.active { display: flex; }
.ty-lb img { max-width: 92vw; max-height: 90vh; object-fit: contain; }
.ty-lb-close { position: absolute; top: 20px; right: 28px; background: none; border: 0; color: #fff; font-size: 2rem; cursor: pointer; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .ty-works { grid-template-columns: repeat(2, 1fr); }
  .ty-features { grid-template-columns: 1fr; }
  .ty-concept { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .ty-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; background: var(--t-bg2); flex-direction: column; gap: 0; padding: 8px 0; border-bottom: 1px solid var(--t-line); }
  .ty-nav.open { display: flex; }
  .ty-nav a { padding: 14px var(--t-px); width: 100%; border-bottom: 1px solid var(--t-line); }
  .ty-nav .ty-cta { margin: 12px var(--t-px); justify-content: center; }
  .ty-burger { display: flex; }
  .ty-dl > div { grid-template-columns: 1fr; gap: 6px; }
}
@media (max-width: 480px) {
  .ty-works { grid-template-columns: 1fr; }
}