/* =========================================================
   (有)大久保建装 site styles
   - 純HTML/CSS、フレームワーク不使用
   - 設計: docs/design-notes.md, docs/copy-guideline.md
   ========================================================= */

/* ---------- tokens ---------- */
:root {
  --paper: #fffefb;
  --kinari: #f4ede0;
  --ivory: #ebe2cf;
  --sumi: #2a2620;
  --sumi-soft: #4a4439;
  --sumi-pale: #6b6359;
  --sugi: #a87c4f;
  --koke: #6b7a52;
  --koke-dark: #4f5c3c;
  --sora: #aab9b1;
  --rust: #b56a3a;
  --line: #d9d2c1;

  --serif-body: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN",
                "Hiragino Mincho Pro", "Noto Serif JP", serif;
  --serif-head: "Shippori Mincho B1", "Yu Mincho", "YuMincho",
                "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --sans: "Hiragino Sans", "Yu Gothic Medium", "Noto Sans JP", sans-serif;

  --maxw: 1180px;
  --measure: 36em;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--serif-body);
  font-feature-settings: "palt" off;
  font-size: 16px;
  line-height: 2.0;
  letter-spacing: 0.05em;
  color: var(--sumi);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--sugi); }
button { font: inherit; cursor: pointer; }
ul { list-style: none; padding: 0; margin: 0; }

/* ---------- japanese line break safety ---------- */
.ja, p, h1, h2, h3, h4, li, dt, dd, blockquote {
  word-break: keep-all;
  overflow-wrap: anywhere;
  line-break: strict;
}

/* ---------- typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif-head);
  font-weight: 700;
  color: var(--sumi);
  letter-spacing: 0.08em;
}
h1 { font-size: clamp(2rem, 4.4vw, 3.2rem); line-height: 1.45; letter-spacing: 0.1em; }
h2 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); line-height: 1.55; }
h3 { font-size: 1.15rem; line-height: 1.6; }
p  { margin-block: 1.6em; max-width: var(--measure); }
.lead { font-size: 1.05rem; line-height: 2.1; }

.eyebrow {
  display: inline-block;
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: 0.32em;
  color: var(--koke-dark);
  margin-bottom: 1.2em;
  padding-left: 1.6em;
  position: relative;
}
.eyebrow::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 1.1em; height: 1px;
  background: var(--koke);
}

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(20px, 5vw, 56px); }
.section { padding-block: clamp(5rem, 9vw, 9rem); }
.section--paper { background: var(--paper); }
.section--kinari { background: var(--kinari); }
.section--ivory { background: var(--ivory); }
.section--sumi { background: var(--sumi); color: var(--paper); }
.section--sumi h2, .section--sumi h3 { color: var(--paper); }
.section--sumi .eyebrow { color: var(--ivory); }
.section--sumi .eyebrow::before { background: var(--ivory); }

.divider {
  border: 0; border-top: 1px solid var(--line);
  margin-block: 4rem;
}

.btn {
  display: inline-flex; align-items: center; gap: .8em;
  padding: .9em 2em;
  font-family: var(--serif-head);
  font-size: .95rem;
  letter-spacing: 0.16em;
  color: var(--paper);
  background: var(--koke);
  border: 1px solid var(--koke);
  transition: background .25s ease, color .25s ease, border-color .25s ease;
}
.btn:hover { background: var(--koke-dark); border-color: var(--koke-dark); color: var(--paper); }
.btn--ghost { background: transparent; color: var(--sumi); border-color: var(--sumi); }
.btn--ghost:hover { background: var(--sumi); color: var(--paper); }
.btn .arrow { display: inline-block; transform: translateY(-1px); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,254,251,0.92);
  backdrop-filter: saturate(160%) blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand {
  display: inline-flex; flex-direction: column; gap: 2px;
  font-family: var(--serif-head); color: var(--sumi);
}
.brand__name { font-size: 1.05rem; letter-spacing: 0.18em; line-height: 1; }
.brand__sub { font-family: var(--sans); font-size: .7rem; letter-spacing: 0.28em; color: var(--sumi-soft); }
.nav { display: flex; gap: 2.2rem; }
.nav a {
  font-family: var(--sans);
  font-size: .88rem; letter-spacing: 0.16em;
  color: var(--sumi-soft);
  position: relative; padding-block: 4px;
}
.nav a[aria-current="page"] { color: var(--sumi); }
.nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 50%; bottom: -2px;
  transform: translateX(-50%);
  width: 14px; height: 1px; background: var(--koke);
}

.menu-toggle {
  display: none; background: none; border: 0;
  padding: 8px;
}
.menu-toggle span {
  display: block; width: 22px; height: 1px; background: var(--sumi);
  margin-block: 5px;
  transition: transform .25s ease, opacity .25s ease;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(5rem, 10vw, 10rem) clamp(4rem, 8vw, 8rem);
  overflow: hidden;
  background:
    radial-gradient(ellipse at 80% 12%, rgba(107,122,82,0.07), transparent 55%),
    var(--paper);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: end;
}
.hero__copy { padding-block: 1rem 0; min-width: 0; }
.hero__catch {
  font-family: var(--serif-head);
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: 0.08em;
  color: var(--sumi);
  margin: 0 0 2rem 0;
  /* 文節改行を厳格に */
  word-break: keep-all;
  overflow-wrap: normal;
  white-space: normal;
}
.hero__catch br + * { display: inline; }
.hero__catch .ten { color: var(--sugi); }
.hero__sub {
  font-size: 1rem; line-height: 2.1; max-width: 28em;
  color: var(--sumi-soft);
}
.hero__sub strong { color: var(--sumi); font-weight: 500; }
.hero__meta {
  margin-top: 2.4rem;
  font-family: var(--sans);
  font-size: .78rem; letter-spacing: 0.28em;
  color: var(--sumi-pale);
}
.hero__visual {
  position: relative; aspect-ratio: 5/6;
  background: var(--kinari);
  border: 1px solid var(--line);
}
.hero__visual svg { width: 100%; height: 100%; }
.hero__caption {
  position: absolute; right: -8px; bottom: -28px;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: .6em 1em;
  font-family: var(--sans);
  font-size: .72rem; letter-spacing: 0.22em;
  color: var(--sumi-soft);
}

/* ---------- intent (社是・矜持) ---------- */
.intent {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}
.intent__label {
  font-family: var(--sans);
  font-size: .78rem; letter-spacing: 0.32em;
  color: var(--koke-dark);
  padding-top: .8em;
  border-top: 1px solid var(--koke);
  width: max-content;
}
.intent__body p { font-size: 1.05rem; }

/* ---------- services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: clamp(2rem, 4vw, 4rem);
  row-gap: clamp(3rem, 6vw, 5rem);
  margin-top: 4rem;
}
.service {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.6rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}
.service__no {
  font-family: var(--serif-head);
  font-size: 1.4rem;
  color: var(--sugi);
  letter-spacing: 0.1em;
}
.service__title {
  font-family: var(--serif-head);
  font-size: 1.25rem;
  margin: 0 0 .8em 0;
  line-height: 1.5;
}
.service__desc {
  font-size: .95rem; line-height: 2.0; color: var(--sumi-soft);
  margin: 0;
}
.service__more {
  display: inline-flex; align-items: center; gap: .6em;
  margin-top: 1.4em;
  font-family: var(--sans);
  font-size: .8rem; letter-spacing: 0.24em;
  color: var(--koke-dark);
  border-bottom: 1px solid var(--koke);
  padding-bottom: 2px;
}

/* ---------- works (施工例) ---------- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
  margin-top: 4rem;
}
.work { position: relative; }
.work__img {
  background: var(--ivory);
  border: 1px solid var(--line);
  aspect-ratio: 4/3;
  overflow: hidden;
}
.work__img svg { width: 100%; height: 100%; }
.work__meta {
  margin-top: 1rem;
  font-family: var(--sans);
  font-size: .76rem;
  letter-spacing: 0.22em;
  color: var(--sumi-pale);
  display: flex; gap: 1em;
}
.work__title {
  font-family: var(--serif-head);
  font-size: 1.05rem;
  margin: .4em 0 0 0;
  line-height: 1.7;
}
/* 不均一なマソンリ風 */
.work--a { grid-column: span 7; }
.work--b { grid-column: span 5; }
.work--c { grid-column: span 5; }
.work--d { grid-column: span 7; }
.work--a .work__img { aspect-ratio: 4/3; }
.work--b .work__img { aspect-ratio: 3/4; margin-top: 3rem; }
.work--c .work__img { aspect-ratio: 5/4; margin-top: 1.5rem; }
.work--d .work__img { aspect-ratio: 5/3; }

/* ---------- event (相談会) ---------- */
.event {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px solid var(--ivory);
  background: var(--paper);
}
.event__title { margin: 0 0 1rem 0; }
.event__schedule { font-family: var(--sans); font-size: .9rem; letter-spacing: 0.18em; color: var(--sumi-soft); margin: 1rem 0; }
.event__list { margin: 1.6rem 0; }
.event__list li { padding-left: 1.2em; position: relative; line-height: 1.9; }
.event__list li::before {
  content: ""; position: absolute; left: 0; top: 0.85em;
  width: .6em; height: 1px; background: var(--sugi);
}

/* ---------- news ---------- */
.news-list { margin-top: 3rem; }
.news-item {
  display: grid;
  grid-template-columns: 130px 130px 1fr;
  gap: 1.6rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.news-item time {
  font-family: var(--sans); font-size: .85rem;
  letter-spacing: 0.16em; color: var(--sumi-pale);
}
.news-item .tag {
  font-family: var(--sans); font-size: .72rem;
  letter-spacing: 0.22em;
  color: var(--koke-dark);
  border: 1px solid var(--koke);
  padding: .3em .8em;
  width: max-content;
}
.news-item h3 {
  font-family: var(--serif-head); font-weight: 500;
  font-size: 1rem;
  margin: 0;
  line-height: 1.8;
}

/* ---------- access ---------- */
.access {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.access dl {
  display: grid;
  grid-template-columns: 7em 1fr;
  row-gap: 1em;
  margin: 2rem 0 0 0;
}
.access dt {
  font-family: var(--sans); font-size: .8rem;
  letter-spacing: 0.22em; color: var(--sumi-pale);
  padding-top: .25em;
}
.access dd {
  margin: 0; font-size: .95rem; line-height: 1.9;
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--sumi);
  color: var(--ivory);
  padding-block: 5rem 2rem;
}
.site-footer .wrap { color: var(--ivory); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3rem;
}
.footer-brand .brand__name { color: var(--paper); }
.footer-brand .brand__sub { color: var(--ivory); }
.footer-brand p { font-size: .85rem; line-height: 2.0; color: var(--ivory); max-width: 22em; margin-top: 1.6rem; }
.footer-nav h4 {
  font-family: var(--sans); font-size: .78rem;
  letter-spacing: 0.28em; color: var(--sora);
  margin: 0 0 1.4rem 0; font-weight: 400;
}
.footer-nav a {
  display: inline-block; padding-block: .5em;
  font-size: .9rem; color: var(--ivory);
}
.footer-nav a:hover { color: var(--paper); }
.footer-bottom {
  margin-top: 4rem; padding-top: 2rem;
  border-top: 1px solid #3a3530;
  display: flex; justify-content: space-between;
  font-family: var(--sans); font-size: .72rem;
  letter-spacing: 0.2em;
  color: var(--sora);
}

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .menu-toggle { display: block; }
  .nav {
    position: fixed; inset: 76px 0 auto 0;
    background: var(--paper);
    flex-direction: column; gap: 0;
    padding: 1.5rem 1.5rem 2rem;
    border-bottom: 1px solid var(--line);
    transform: translateY(-110%);
    transition: transform .25s ease;
  }
  .nav.is-open { transform: translateY(0); }
  .nav a {
    padding: 1em 0;
    border-bottom: 1px solid var(--line);
  }
  .hero__grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero__visual { aspect-ratio: 4/4.5; }
  .intent { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .works-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .work--a, .work--b, .work--c, .work--d { grid-column: span 1; }
  .work--b .work__img, .work--c .work__img { margin-top: 0; }
  .event { grid-template-columns: 1fr; }
  .access { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: .8rem; padding: 1.4rem 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer-bottom { flex-direction: column; gap: 1rem; }
}

/* ---------- gentle reveal (single fade-in, respects motion preference) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .9s ease, transform .9s ease;
}
.reveal.is-in { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- utilities ---------- */
.pc-only { display: inline; }
.sp-only { display: none; }
@media (max-width: 640px) {
  .pc-only { display: none; }
  .sp-only { display: inline; }
}
.center { text-align: center; }
.mt-l { margin-top: 3rem; }
.mt-xl { margin-top: 5rem; }