/* ================================================
   m28e 提案用プロトタイプ 共通スタイル
   世界観: 木・土・光・風・手仕事・余白
================================================ */
:root {
  --ink: #22261f;
  --ink-soft: #4a5044;
  --paper: #f7f4ec;
  --paper-warm: #efe9db;
  --moss: #3d5a45;
  --moss-deep: #24382b;
  --soil: #8a7050;
  --gold: #b39257;
  --haze: #ddd6c4;
  --white: #fdfcf9;
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.9;
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  transition: background .4s, box-shadow .4s;
}
.site-header.scrolled { background: rgba(247,244,236,.94); box-shadow: 0 1px 0 rgba(34,38,31,.08); backdrop-filter: blur(8px); }
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand .logo { font-family: var(--serif); font-size: 1.5rem; font-weight: 600; letter-spacing: .08em; }
.brand .tag { font-size: .68rem; color: var(--ink-soft); letter-spacing: .12em; }
.site-header.on-hero .brand, .site-header.on-hero .gnav a { color: var(--white); }
.site-header.scrolled .brand, .site-header.scrolled .gnav a { color: var(--ink); }
.gnav { display: flex; gap: 26px; align-items: center; }
.gnav a { font-size: .8rem; letter-spacing: .18em; position: relative; padding: 4px 0; }
.gnav a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: currentColor; transition: width .3s; }
.gnav a:hover::after, .gnav a.current::after { width: 100%; }
.nav-toggle { display: none; }

/* ---------- hero ---------- */
.hero { position: relative; height: 100svh; min-height: 560px; overflow: hidden; }
.hero img.bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(20,26,20,.25), rgba(20,26,20,.05) 40%, rgba(20,26,20,.45)); }
.hero .copy {
  position: absolute; right: clamp(24px, 7vw, 96px); top: 50%; transform: translateY(-50%);
  z-index: 2; color: var(--white);
  writing-mode: vertical-rl; text-orientation: mixed;
  font-family: var(--serif); font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  letter-spacing: .3em; line-height: 2.2;
  text-shadow: 0 2px 24px rgba(0,0,0,.45);
}
.hero .copy small { font-size: .45em; letter-spacing: .4em; opacity: .85; }
.hero .scroll-cue {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); z-index: 2;
  color: var(--white); font-size: .65rem; letter-spacing: .35em; opacity: .8;
}
.scroll-cue::after { content: ""; display: block; width: 1px; height: 44px; background: var(--white); margin: 8px auto 0; animation: cue 2.2s infinite; }
@keyframes cue { 0% { transform: scaleY(0); transform-origin: top } 45% { transform: scaleY(1); transform-origin: top } 55% { transform: scaleY(1); transform-origin: bottom } 100% { transform: scaleY(0); transform-origin: bottom } }

/* ---------- page hero (sub pages) ---------- */
.page-hero { position: relative; height: 44vh; min-height: 300px; overflow: hidden; display: flex; align-items: flex-end; }
.page-hero img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.page-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(20,26,20,.3), rgba(20,26,20,.55)); }
.page-hero .ttl { position: relative; z-index: 2; color: var(--white); padding: 0 clamp(24px, 7vw, 96px) 48px; }
.page-hero .ttl .en { font-family: var(--serif); font-size: clamp(2rem, 4.6vw, 3.2rem); letter-spacing: .2em; }
.page-hero .ttl .ja { font-size: .85rem; letter-spacing: .3em; margin-top: 6px; opacity: .9; }

/* ---------- sections ---------- */
.section { padding: clamp(70px, 11vw, 130px) clamp(24px, 7vw, 96px); }
.section.tight { padding-top: clamp(40px, 6vw, 70px); }
.section.paper-warm { background: var(--paper-warm); }
.section.deep { background: var(--moss-deep); color: var(--paper); }
.inner { max-width: 1080px; margin: 0 auto; }
.inner.wide { max-width: 1280px; }
.sec-head { margin-bottom: clamp(36px, 6vw, 64px); }
.sec-head .en { font-family: var(--serif); font-size: clamp(1.7rem, 3.4vw, 2.4rem); letter-spacing: .18em; }
.sec-head .ja { display: inline-block; font-size: .8rem; letter-spacing: .3em; color: var(--gold); margin-top: 8px; }
.section.deep .sec-head .ja { color: var(--haze); }
.lead { font-family: var(--serif); font-size: clamp(1.05rem, 1.9vw, 1.3rem); line-height: 2.4; letter-spacing: .1em; }
p.note { font-size: .85rem; color: var(--ink-soft); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: .82rem; letter-spacing: .22em;
  padding: 15px 34px; border: 1px solid currentColor;
  transition: background .3s, color .3s; cursor: pointer; background: transparent;
  font-family: var(--sans);
}
.btn::after { content: "→"; font-family: serif; transition: transform .3s; }
.btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn:hover::after { transform: translateX(5px); }
.btn.fill { background: var(--moss); color: var(--white); border-color: var(--moss); }
.btn.fill:hover { background: var(--moss-deep); border-color: var(--moss-deep); }
.btn.ghost-light { color: var(--white); }
.btn.ghost-light:hover { background: var(--white); color: var(--ink); border-color: var(--white); }

/* ---------- video placeholder ---------- */
.video-area { position: relative; aspect-ratio: 16 / 9; max-width: 1080px; margin: 0 auto; overflow: hidden; background: var(--ink); }
.video-area img { width: 100%; height: 100%; object-fit: cover; opacity: .55; }
.video-area .vp {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; color: var(--white);
}
.video-area .play { width: 74px; height: 74px; border: 1px solid rgba(255,255,255,.8); border-radius: 50%; display: grid; place-items: center; font-size: 1.2rem; }
.video-area .vp span { font-size: .75rem; letter-spacing: .3em; }

/* ---------- cards / grids ---------- */
.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(16px, 2.5vw, 32px); }
.work-card { position: relative; overflow: hidden; display: block; }
.work-card .ph { aspect-ratio: 4 / 3; overflow: hidden; }
.work-card .ph img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s ease; }
.work-card:hover .ph img { transform: scale(1.06); }
.work-card .meta { padding: 14px 4px 0; }
.work-card .meta .cat { font-size: .65rem; letter-spacing: .2em; color: var(--gold); }
.work-card .meta h3 { font-family: var(--serif); font-size: 1rem; font-weight: 500; letter-spacing: .08em; margin-top: 2px; }

.staff-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(20px, 3vw, 44px); }
.staff-card .ph { aspect-ratio: 3 / 4; overflow: hidden; }
.staff-card .ph img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.92); transition: transform .8s; }
.staff-card:hover .ph img { transform: scale(1.04); }
.staff-card .role { font-size: .7rem; letter-spacing: .25em; color: var(--gold); margin-top: 16px; }
.staff-card h3 { font-family: var(--serif); font-size: 1.25rem; font-weight: 600; letter-spacing: .1em; }
.staff-card h3 small { font-size: .65rem; letter-spacing: .15em; color: var(--ink-soft); margin-left: 10px; }
.staff-card p { font-size: .85rem; margin-top: 10px; color: var(--ink-soft); }

/* ---------- philosophy split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(30px, 6vw, 80px); align-items: center; }
.split .ph { overflow: hidden; }
.split .ph img { width: 100%; height: 100%; object-fit: cover; }
.split h3 { font-family: var(--serif); font-size: clamp(1.3rem, 2.4vw, 1.7rem); font-weight: 600; letter-spacing: .14em; line-height: 2; margin-bottom: 22px; }
.split p + p { margin-top: 1em; }

/* ---------- gallery ---------- */
.gallery-grid { columns: 3; column-gap: 14px; }
.gallery-grid a { display: block; margin-bottom: 14px; break-inside: avoid; overflow: hidden; cursor: zoom-in; }
.gallery-grid img { transition: transform .6s, opacity .6s; }
.gallery-grid a:hover img { transform: scale(1.03); opacity: .9; }
.lightbox { position: fixed; inset: 0; z-index: 300; background: rgba(15,18,15,.93); display: none; align-items: center; justify-content: center; padding: 4vw; cursor: zoom-out; }
.lightbox.open { display: flex; }
.lightbox img { max-width: 100%; max-height: 100%; object-fit: contain; box-shadow: 0 20px 80px rgba(0,0,0,.5); }

/* ---------- table ---------- */
.def-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.def-table th, .def-table td { padding: 20px 8px; border-bottom: 1px solid var(--haze); text-align: left; vertical-align: top; }
.def-table th { width: 180px; font-weight: 500; letter-spacing: .15em; color: var(--moss); white-space: nowrap; }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band .lead { margin-bottom: 30px; }
.sns-row { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; margin-top: 34px; }
.sns-row a { display: inline-flex; align-items: center; gap: 8px; font-size: .78rem; letter-spacing: .15em; border: 1px solid var(--haze); padding: 12px 22px; border-radius: 999px; transition: .3s; }
.sns-row a:hover { background: var(--white); border-color: var(--gold); color: var(--moss-deep); }
.section.deep .sns-row a { border-color: rgba(255,255,255,.3); }
.section.deep .sns-row a:hover { background: rgba(255,255,255,.1); color: var(--white); }

/* ---------- footer ---------- */
.site-footer { background: var(--moss-deep); color: var(--haze); padding: 60px clamp(24px, 7vw, 96px) 30px; }
.site-footer .cols { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; max-width: 1080px; margin: 0 auto; }
.site-footer .logo { font-family: var(--serif); font-size: 1.4rem; color: var(--white); letter-spacing: .1em; }
.site-footer .addr { font-size: .8rem; margin-top: 14px; line-height: 2; }
.site-footer nav { display: flex; gap: 40px; }
.site-footer nav ul li { margin-bottom: 10px; }
.site-footer nav a { font-size: .78rem; letter-spacing: .18em; opacity: .85; }
.site-footer nav a:hover { opacity: 1; color: var(--white); }
.site-footer .copy-line { text-align: center; font-size: .68rem; letter-spacing: .2em; margin-top: 50px; opacity: .55; }
.demo-ribbon {
  position: fixed; left: -46px; top: 26px; z-index: 200; transform: rotate(-45deg);
  background: var(--gold); color: #fff; font-size: .62rem; letter-spacing: .28em;
  padding: 6px 60px; box-shadow: 0 2px 10px rgba(0,0,0,.25); pointer-events: none;
}

/* ---------- reveal ---------- */
.rv { opacity: 0; transform: translateY(26px); transition: opacity .9s ease, transform .9s ease; }
.rv.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { columns: 2; }
  .split { grid-template-columns: 1fr; }
  .staff-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
}
@media (max-width: 720px) {
  .gnav {
    position: fixed; inset: 0; background: rgba(30,42,32,.97); flex-direction: column;
    align-items: center; justify-content: center; gap: 34px;
    opacity: 0; pointer-events: none; transition: opacity .35s;
  }
  .gnav.open { opacity: 1; pointer-events: auto; }
  .gnav a { color: var(--white) !important; font-size: 1rem; }
  .nav-toggle {
    display: block; z-index: 110; background: none; border: none; cursor: pointer;
    width: 40px; height: 40px; position: relative;
  }
  .nav-toggle span { position: absolute; left: 8px; right: 8px; height: 1.5px; background: currentColor; transition: .3s; }
  .nav-toggle span:nth-child(1) { top: 13px; } .nav-toggle span:nth-child(2) { top: 20px; } .nav-toggle span:nth-child(3) { top: 27px; }
  .site-header.on-hero .nav-toggle { color: #fff; } .site-header.scrolled .nav-toggle { color: var(--ink); }
  .nav-open .nav-toggle { color: #fff !important; }
  .nav-open .nav-toggle span:nth-child(1) { top: 20px; transform: rotate(45deg); }
  .nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav-open .nav-toggle span:nth-child(3) { top: 20px; transform: rotate(-45deg); }
  .hero .copy { right: 24px; }
}