:root {
  --paper: #f3eee4;
  --paper-2: #e8e0d0;
  --ink: #2f2a24;
  --muted: #7a7166;
  --line: #cfc5b3;
  --green: #4f5d45;
  --wood: #a9743f;
  --dark: #26221d;
  --font-en: "Jost", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --max: 1180px;
  --pad: clamp(18px, 5vw, 64px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: var(--font-body); color: var(--ink); background: var(--paper); line-height: 2; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.label { font-family: var(--font-en); font-size: .8rem; letter-spacing: .3em; color: var(--wood); }
h2 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(1.8rem, 4.4vw, 3rem); line-height: 1.5; letter-spacing: .12em; }

/* ---------- ヘッダー ---------- */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; display: flex; align-items: center; gap: 28px; padding: 18px var(--pad); transition: background .3s, padding .3s; }
.header.scrolled { padding-top: 10px; padding-bottom: 10px; background: rgba(243, 238, 228, .95); }

.logo { display: flex; flex-direction: column; margin-right: auto; line-height: 1.2; }
.logo b { font-family: var(--font-en); font-weight: 400; font-size: 1.4rem; letter-spacing: .3em; }
.logo small { font-size: .62rem; letter-spacing: .3em; color: var(--muted); }

.nav { display: flex; gap: 26px; font-size: .84rem; }
.nav a { display: flex; flex-direction: column; line-height: 1.5; white-space: nowrap; transition: color .2s; }
.nav a:hover { color: var(--wood); }
.nav span { font-family: var(--font-en); font-size: .68rem; letter-spacing: .1em; color: var(--wood); }

.header-cta { padding: 10px 22px; font-size: .84rem; color: var(--paper); background: var(--green); white-space: nowrap; transition: background .2s; }
.header-cta:hover { background: var(--dark); }

.nav-toggle { display: none; position: relative; width: 44px; height: 44px; background: none; border: 0; cursor: pointer; }
.nav-toggle span { position: absolute; left: 8px; width: 28px; height: 1px; background: var(--ink); transition: transform .25s; }
.nav-toggle span:nth-child(1) { top: 18px; }
.nav-toggle span:nth-child(2) { top: 26px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(4px) rotate(30deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-4px) rotate(-30deg); }

/* ---------- ファーストビュー ---------- */
.hero { position: relative; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: center; min-height: min(100vh, 820px); padding: 110px 0 60px var(--pad); }
.hero-text { position: relative; z-index: 2; grid-column: 1; grid-row: 1; }
.hero-en { font-family: var(--font-en); font-weight: 300; font-size: .9rem; letter-spacing: .16em; color: var(--muted); }
.hero h1 { margin: 20px 0 28px; font-family: var(--font-serif); font-weight: 400; font-size: clamp(2.6rem, 6.4vw, 5.2rem); line-height: 1.4; letter-spacing: .14em; white-space: nowrap; }
.hero-lead { max-width: 27em; font-size: .95rem; }

.hero-visual { position: relative; grid-column: 2; grid-row: 1; align-self: stretch; min-height: 420px; overflow: hidden; background: linear-gradient(180deg, #dfe6dc 0%, #efe6d2 60%, #e3d6ba 100%); }
.sun { position: absolute; right: 14%; top: 14%; width: clamp(80px, 12vw, 150px); aspect-ratio: 1; background: #f4d9a8; border-radius: 50%; animation: sun 9s ease-in-out infinite alternate; }
@keyframes sun { to { transform: translateY(14px) scale(1.06); } }
.hill { position: absolute; left: -10%; right: -10%; bottom: -34%; height: 70%; background: #8d9a7c; border-radius: 50% 50% 0 0; }
.hill::before { content: ""; position: absolute; left: 30%; right: -30%; top: 12%; bottom: 0; background: #6f7d61; border-radius: 50% 50% 0 0; }
.house { position: absolute; left: 22%; bottom: 20%; width: 46%; aspect-ratio: 16 / 10; }
.house i { position: absolute; }
.house i:nth-child(1) { left: 0; right: 0; bottom: 0; height: 56%; background: #f7f1e3; }
.house i:nth-child(2) { left: -6%; right: -6%; top: 0; height: 48%; background: var(--dark); clip-path: polygon(50% 0, 100% 100%, 0 100%); }
.house i:nth-child(3) { left: 12%; bottom: 0; width: 46%; height: 40%; background: linear-gradient(90deg, var(--wood) 0 30%, transparent 30% 36%, #cfe0dc 36% 66%, transparent 66% 70%, #cfe0dc 70%); }

.hero-scroll { position: absolute; left: var(--pad); bottom: 24px; font-family: var(--font-en); font-size: .7rem; letter-spacing: .4em; color: var(--muted); }
.hero-scroll::after { content: ""; display: inline-block; width: 60px; height: 1px; margin-left: 14px; vertical-align: middle; background: var(--muted); animation: line 2.4s ease-in-out infinite; transform-origin: left; }
@keyframes line { 0% { transform: scaleX(0); } 60%, 100% { transform: scaleX(1); } }

/* ---------- 共通 ---------- */
.section { max-width: calc(var(--max) + var(--pad) * 2); margin: 0 auto; padding: clamp(70px, 11vw, 140px) var(--pad); }

/* ---------- 考え方 ---------- */
.concept { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 40px clamp(30px, 6vw, 90px); }
.concept-head { position: sticky; top: 110px; align-self: start; }
.concept-list article { display: grid; grid-template-columns: 70px minmax(0, 1fr); gap: 20px; padding: 34px 0; border-top: 1px solid var(--line); }
.concept-list article:last-child { border-bottom: 1px solid var(--line); }
.concept-list span { font-family: var(--font-serif); font-size: 2.6rem; line-height: 1.2; color: var(--wood); }
.concept-list h3 { margin-bottom: 8px; font-family: var(--font-serif); font-weight: 400; font-size: clamp(1.2rem, 2.4vw, 1.6rem); letter-spacing: .08em; }
.concept-list p { font-size: .94rem; color: var(--muted); }

/* ---------- 施工事例 ---------- */
.works { max-width: none; background: var(--paper-2); }
.works > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.works-head { display: grid; grid-template-columns: auto auto minmax(0, 1fr); align-items: baseline; gap: 6px 30px; margin-bottom: 50px; }
.works-head .label { grid-column: 1 / -1; }
.works-head p:last-child { font-size: .92rem; color: var(--muted); }

.works-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(20px, 3vw, 40px); }
.w1 { grid-column: span 7; }
.w2 { grid-column: span 5; margin-top: 80px; }
.w3 { grid-column: 2 / span 5; }
.w4 { grid-column: span 6; margin-top: 60px; }
.ph { margin-bottom: 14px; overflow: hidden; transition: transform .6s cubic-bezier(.2, .8, .2, 1); }
.work:hover .ph { transform: scale(.97); }
.ph-a { aspect-ratio: 4 / 3; background: linear-gradient(180deg, #d9e2d6 0 46%, #b98a55 46% 52%, #e9dcc3 52% 78%, #6d5a44 78%); }
.ph-b { aspect-ratio: 4 / 5; background: linear-gradient(90deg, #efe6d4 0 28%, #3a332b 28% 34%, #dfe7e6 34% 72%, #c79862 72%); }
.ph-c { aspect-ratio: 1; background: repeating-linear-gradient(90deg, #5a4631 0 18px, #efe6d4 18px 110px); }
.ph-d { aspect-ratio: 16 / 11; background: linear-gradient(180deg, #e6ecdf 0 40%, #7f8d6f 40% 60%, #efe6d4 60% 64%, #a9743f 64%); }
.work p { font-family: var(--font-en); font-size: .72rem; letter-spacing: .2em; color: var(--wood); }
.work h3 { font-family: var(--font-serif); font-weight: 400; font-size: 1.2rem; letter-spacing: .08em; }

/* ---------- 数字 ---------- */
.numbers { padding: clamp(50px, 7vw, 80px) var(--pad); color: var(--paper); background: var(--green); }
.numbers dl { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 30px; max-width: var(--max); margin: 0 auto; }
.numbers dt { font-size: .82rem; letter-spacing: .14em; opacity: .8; }
.numbers dd { font-family: var(--font-en); font-weight: 300; font-size: clamp(2.6rem, 6vw, 4.6rem); line-height: 1.2; }
.numbers small { margin-left: 6px; font-family: var(--font-body); font-size: .9rem; }

/* ---------- 流れ ---------- */
.flow ol { margin-top: 44px; border-top: 1px solid var(--ink); }
.flow li { display: grid; grid-template-columns: 80px minmax(0, 240px) minmax(0, 1fr) auto; align-items: center; gap: 10px 30px; padding: 26px 0; border-bottom: 1px solid var(--line); transition: padding .3s, background .3s; }
.flow li:hover { padding-left: 14px; background: rgba(255, 255, 255, .4); }
.flow span { font-family: var(--font-en); font-weight: 300; font-size: 2rem; color: var(--wood); }
.flow h3 { font-family: var(--font-serif); font-weight: 400; font-size: 1.25rem; letter-spacing: .08em; }
.flow p { font-size: .92rem; color: var(--muted); }
.flow small { padding: 2px 16px; font-size: .78rem; border: 1px solid var(--line); border-radius: 999px; white-space: nowrap; }

/* ---------- 見学会 ---------- */
.event { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(24px, 5vw, 70px); align-items: center; width: calc(100% - var(--pad) * 2); max-width: var(--max); margin: 0 auto; padding: clamp(34px, 5vw, 60px); background: #fff; border-left: 6px solid var(--wood); }
.event-date { display: grid; grid-template-columns: auto auto; align-items: baseline; gap: 0 10px; font-family: var(--font-en); }
.event-date small { grid-column: 1 / -1; letter-spacing: .3em; color: var(--muted); }
.event-date b { font-weight: 300; font-size: clamp(2.4rem, 5vw, 3.8rem); line-height: 1.15; }
.event-date span { font-size: .8rem; letter-spacing: .2em; color: var(--wood); }
.event-date i { display: none; }
.event h2 { margin: 6px 0 10px; font-size: clamp(1.3rem, 2.8vw, 1.8rem); }
.event-body > p:not(.label) { margin-bottom: 20px; font-size: .92rem; color: var(--muted); }

.btn { display: inline-flex; align-items: center; gap: 18px; padding: 12px 26px; font-size: .92rem; color: var(--paper); background: var(--dark); transition: background .25s; }
.btn i { width: 34px; height: 1px; background: currentColor; transition: width .25s; }
.btn:hover { background: var(--green); }
.btn:hover i { width: 54px; }
.btn-light { color: var(--dark); background: var(--paper); }
.btn-light:hover { color: var(--paper); background: var(--wood); }

/* ---------- 会社案内 ---------- */
.company { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 30px clamp(30px, 6vw, 90px); }
.company dl { border-top: 1px solid var(--ink); }
.company dl > div { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 20px; padding: 18px 0; font-size: .94rem; border-bottom: 1px solid var(--line); }
.company dt { color: var(--muted); }

/* ---------- お問い合わせ ---------- */
.contact { padding: clamp(70px, 10vw, 120px) var(--pad); text-align: center; color: var(--paper); background: var(--dark); }
.contact h2 { margin: 10px 0 34px; }
.contact-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.contact-tel { margin-top: 34px; font-family: var(--font-en); font-weight: 300; font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: .1em; line-height: 1.4; }
.contact-tel small { display: block; font-family: var(--font-body); font-size: .8rem; letter-spacing: .06em; opacity: .7; }
.contact-note { margin-top: 20px; font-size: .78rem; opacity: .7; }

.footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; padding: 26px var(--pad); color: var(--paper); background: #1b1814; }
.footer-logo { font-family: var(--font-en); letter-spacing: .3em; }
.copy { font-size: .74rem; opacity: .7; }

/* ---------- 表示アニメーション ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(34px); transition: opacity .9s ease, transform .9s cubic-bezier(.2, .8, .2, 1); }
.js [data-reveal].in { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .nav { position: fixed; inset: 0; z-index: -1; flex-direction: column; justify-content: center; gap: 22px; padding: 80px var(--pad); font-size: 1.2rem; background: var(--paper); opacity: 0; visibility: hidden; transition: opacity .3s, visibility .3s; }
  .nav.open { opacity: 1; visibility: visible; }
  .hero { grid-template-columns: minmax(0, 1fr); padding-right: var(--pad); }
  .hero-visual { grid-column: 1; grid-row: 2; min-height: 300px; margin-top: 34px; }
  .hero h1 { white-space: normal; }
  .hero-scroll { display: none; }
  .concept, .company { grid-template-columns: minmax(0, 1fr); }
  .concept-head { position: static; }
  .concept-head br { display: none; }
  .flow li { grid-template-columns: 60px minmax(0, 1fr) auto; }
  .flow p { grid-column: 2 / -1; }
}

@media (max-width: 640px) {
  .works-head { grid-template-columns: minmax(0, 1fr); }
  .works-grid { grid-template-columns: minmax(0, 1fr); }
  .w1, .w2, .w3, .w4 { grid-column: auto; margin-top: 0; }
  .numbers dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .concept-list article { grid-template-columns: 46px minmax(0, 1fr); gap: 12px; }
  .concept-list span { font-size: 1.9rem; }
  .event { grid-template-columns: minmax(0, 1fr); }
  .company dl > div { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .contact .btn { width: 100%; justify-content: space-between; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
}