/* ============================================================
   SBG BRUSH — style.css v0.1
   Base: SBG-SITE-001 template (structure reused)
   Palette: 炭色×真鍮×鋼線×生成り (material-derived)
   Type: Zen Old Mincho (display) / Zen Kaku Gothic New (body)
         IBM Plex Mono (spec / indices)
   ============================================================ */

:root{
  --ink:#1A1B1E;
  --pane:#22242A;
  --line:#33363E;
  --mist:#EDEBE6;
  --fog:#9BA0A6;
  --brass:#C9A44E;
  --steel:#8FA5B5;
  --maxw:1120px;
  --rail:72px;
  --radius:2px;
  --ff-display:"Zen Old Mincho", serif;
  --ff-body:"Zen Kaku Gothic New", sans-serif;
  --ff-mono:"IBM Plex Mono", monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--ink);
  color:var(--mist);
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.9;
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
}
img,video{display:block;max-width:100%}
a{color:var(--brass);text-decoration:none}
a:hover{color:var(--mist)}
:focus-visible{outline:2px solid var(--brass);outline-offset:3px}
.mono{font-family:var(--ff-mono);letter-spacing:.06em}

/* ---------- photo placeholders ---------- */
.ph{
  position:relative;width:100%;height:100%;
  background:
    repeating-linear-gradient(45deg,
      rgba(201,164,78,.06) 0 2px, transparent 2px 14px),
    linear-gradient(160deg, #202228 0%, #17181B 100%);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
}
.ph__label{
  font-size:10px;color:var(--fog);letter-spacing:.18em;
  border:1px dashed var(--line);border-radius:var(--radius);
  padding:8px 14px;background:rgba(26,27,30,.7);
}
.ph--reel{border-inline:0}
.ph--card{aspect-ratio:4/3;border-radius:var(--radius)}

/* ---------- fixed top bar ---------- */
.bar{
  position:fixed;inset:0 0 auto 0;z-index:60;
  display:flex;align-items:center;gap:28px;
  padding:14px 24px;
  background:linear-gradient(to bottom, rgba(26,27,30,.92), rgba(26,27,30,0));
}
.bar__brand{
  font-family:var(--ff-mono);font-weight:500;font-size:14px;
  color:var(--mist);letter-spacing:.14em;
}
.bar__brand span{color:var(--brass)}
.bar__nav{display:flex;gap:22px;margin-left:auto}
.bar__nav a{
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.14em;
  color:var(--fog);
}
.bar__nav a:hover{color:var(--mist)}
.bar__cta{
  color:var(--ink)!important;background:var(--brass);
  padding:6px 14px;border-radius:var(--radius);
}
.bar__cta:hover{background:var(--mist)}

/* ---------- left chapter rail ---------- */
.rail{
  position:fixed;left:0;top:0;bottom:0;width:var(--rail);z-index:50;
  display:flex;flex-direction:column;justify-content:center;gap:14px;
  padding-left:18px;border-right:1px solid var(--line);
  background:rgba(26,27,30,.6);backdrop-filter:blur(6px);
}
.rail a{display:flex;align-items:baseline;gap:8px;color:var(--fog)}
.rail i{font-style:normal;font-family:var(--ff-mono);font-size:10px}
.rail em{
  font-style:normal;font-family:var(--ff-mono);font-size:9px;letter-spacing:.16em;
  opacity:0;transform:translateX(-6px);transition:opacity .25s,transform .25s;
  white-space:nowrap;
}
.rail a:hover em,.rail a.is-active em{opacity:1;transform:none}
.rail a.is-active{color:var(--brass)}

main{padding-left:var(--rail)}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden}
.hero__ph{position:absolute;inset:0;border:0}
.hero__ph .ph__label{position:absolute;top:96px;right:24px}
.hero__shade{
  position:absolute;inset:0;
  background:
    linear-gradient(to top, rgba(26,27,30,.95) 0%, rgba(26,27,30,.35) 45%, rgba(26,27,30,.15) 100%),
    linear-gradient(105deg, rgba(26,27,30,.55) 0%, rgba(26,27,30,0) 55%);
}
.hero__inner{position:relative;z-index:2;padding:0 6vw 12vh;max-width:900px}
.kicker{font-size:11px;color:var(--fog);letter-spacing:.2em;margin-bottom:22px}
.hero__title{
  font-family:var(--ff-display);font-weight:600;
  font-size:clamp(40px, 7.2vw, 88px);
  line-height:1.28;letter-spacing:.04em;
}
.hero__title .line{display:block;opacity:0;transform:translateY(24px);animation:rise .9s cubic-bezier(.2,.7,.2,1) forwards}
.hero__title .line:nth-child(2){animation-delay:.18s}
.hero__title .line:nth-child(3){animation-delay:.36s}
.hero__title .em{color:var(--brass)}
@keyframes rise{to{opacity:1;transform:none}}
.hero__sub{margin-top:26px;color:var(--mist);max-width:560px;font-size:15px}
.hero__scroll{margin-top:44px;font-size:10px;color:var(--fog);letter-spacing:.24em}

/* ---------- material chip ---------- */
.chip{
  position:absolute;right:22px;bottom:22px;z-index:3;
  display:inline-flex;align-items:center;gap:10px;
  background:rgba(26,27,30,.78);backdrop-filter:blur(6px);
  border:1px solid var(--line);border-radius:var(--radius);
  color:var(--fog);font-family:var(--ff-mono);font-size:11px;letter-spacing:.08em;
  padding:8px 12px;cursor:pointer;transition:border-color .2s,color .2s;
}
.chip:hover{border-color:var(--brass);color:var(--brass)}
.chip .mono{color:var(--brass)}

.chipcard{
  position:fixed;right:24px;bottom:24px;z-index:70;width:min(360px,calc(100vw - 48px));
  background:var(--pane);border:1px solid var(--brass);border-radius:var(--radius);
  padding:20px 22px;box-shadow:0 20px 60px rgba(0,0,0,.5);
}
.chipcard__title{color:var(--brass);font-size:12px;margin-bottom:12px;padding-right:28px}
.chipcard dl div{display:grid;grid-template-columns:88px 1fr;gap:10px;padding:6px 0;border-top:1px solid var(--line)}
.chipcard dt{font-size:10px;color:var(--fog);padding-top:3px}
.chipcard dd{font-size:13px;line-height:1.7}
.chipcard__note{margin-top:12px;font-size:10px;color:var(--fog)}
.chipcard__close{
  position:absolute;top:10px;right:10px;background:none;border:0;color:var(--fog);
  font-size:14px;cursor:pointer;padding:6px;
}
.chipcard__close:hover{color:var(--mist)}

/* ---------- sections ---------- */
.sec{padding:120px 6vw;position:relative}
.sec--pane{background:var(--pane)}
.sec__head{
  max-width:var(--maxw);margin:0 auto 40px;
  display:flex;align-items:baseline;gap:20px;
  border-bottom:1px solid var(--line);padding-bottom:14px;
}
.idx{font-size:34px;color:var(--brass);line-height:1}
.eyebrow{font-size:11px;color:var(--fog);letter-spacing:.2em}
.sec__grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:7fr 4fr;gap:60px}
.sec__main h2{
  font-family:var(--ff-display);font-weight:600;
  font-size:clamp(26px,3.4vw,40px);line-height:1.5;letter-spacing:.03em;
  margin-bottom:26px;
}
.sec__main p{margin-bottom:18px;color:#CFCDC6;max-width:620px}
.sec__main strong{color:var(--mist)}
.note{font-size:11px;color:var(--fog)}

/* facts */
.facts{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);height:fit-content}
.facts div{background:var(--ink);padding:22px 18px}
.sec--pane .facts div{background:var(--pane)}
.facts dt{font-size:34px;color:var(--brass);line-height:1.1}
.facts dt span{font-size:13px;color:var(--fog)}
.facts dd{font-size:10.5px;color:var(--fog);font-family:var(--ff-mono);letter-spacing:.08em;margin-top:8px;line-height:1.6}

/* materials rows (02) */
.layers{max-width:var(--maxw);margin:48px auto 0;list-style:none;border-top:1px solid var(--line)}
.layers li{
  display:grid;grid-template-columns:64px 260px 1fr;gap:24px;align-items:baseline;
  padding:22px 4px;border-bottom:1px solid var(--line);
}
.layers li span{color:var(--steel);font-size:13px}
.layers li strong{font-family:var(--ff-display);font-weight:600;font-size:18px;letter-spacing:.04em}
.layers li p{color:var(--fog);font-size:14px;line-height:1.9}

/* interlude reels */
.reel{position:relative;height:52svh;overflow:hidden;border-block:1px solid var(--line);margin:0}
.reel .ph{height:100%}
.reel__img{width:100%;height:100%;object-fit:cover;object-position:center}

/* products (03) */
.four{max-width:var(--maxw);margin:56px auto 0;list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.four__card{
  border:1px solid var(--line);border-top:2px solid var(--el,var(--brass));
  border-radius:var(--radius);padding:24px 20px;background:rgba(34,36,42,.5);
  transition:transform .25s,border-color .25s;
}
.four__card:hover{transform:translateY(-4px);border-color:var(--el)}
.four__el{font-size:10px;color:var(--el);letter-spacing:.14em}
.four__card h3{font-family:var(--ff-display);font-size:22px;font-weight:600;line-height:1.5;margin:10px 0 10px}
.four__card p{font-size:13px;color:var(--fog);line-height:1.9;margin-bottom:16px}
.four__card a{font-family:var(--ff-mono);font-size:11px;letter-spacing:.06em}

/* gallery grid (04) */
.grid6{max-width:var(--maxw);margin:56px auto 0;list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid6 figure{position:relative}
.grid6 img{
  width:100%;aspect-ratio:4/3;object-fit:contain;
  background:#F4F2ED;border:1px solid var(--line);border-radius:var(--radius);
  padding:10px;
}
.grid6 figcaption{margin-top:10px;font-size:11px;color:var(--fog);letter-spacing:.08em}

/* service (05) */
.svc{max-width:var(--maxw);margin:48px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.svc__card{
  border:1px solid var(--line);border-radius:var(--radius);padding:34px 30px;
  background:rgba(34,36,42,.5);display:flex;flex-direction:column;gap:14px;
}
.svc__tag{font-size:10px;color:var(--steel);letter-spacing:.16em}
.svc__card h3{font-family:var(--ff-display);font-size:24px;font-weight:600;letter-spacing:.03em}
.svc__card p{font-size:14px;color:#CFCDC6}
.svc__link{font-family:var(--ff-mono);font-size:12px;margin-top:auto}

/* history (06) */
.creed{border-left:2px solid var(--brass);padding:6px 0 6px 26px;height:fit-content}
.creed .mono{font-size:10px;color:var(--fog);letter-spacing:.18em;margin-bottom:14px}
.creed ul{list-style:none}
.creed li{
  font-family:var(--ff-display);font-size:17px;line-height:2.3;letter-spacing:.04em;
  display:flex;gap:18px;align-items:baseline;
}
.creed li .mono{font-size:13px;color:var(--brass);margin:0}

/* contact (07) */
.ct{display:flex;flex-wrap:wrap;gap:16px;margin:30px 0 18px}
.ct__big{
  display:flex;align-items:center;gap:16px;
  border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 26px;font-family:var(--ff-display);font-size:22px;color:var(--mist);
  transition:border-color .2s;
}
.ct__big:hover{border-color:var(--brass);color:var(--brass)}
.ct__big .mono{font-size:10px;color:var(--steel);letter-spacing:.16em}

.corp{border:1px solid var(--line);height:fit-content}
.corp div{display:grid;grid-template-columns:96px 1fr;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line)}
.corp div:last-child{border-bottom:0}
.corp dt{font-size:10px;color:var(--fog);letter-spacing:.12em;padding-top:4px}
.corp dd{font-size:14px;line-height:1.7}

/* footer */
.foot{border-top:1px solid var(--line);padding:70px 6vw 30px;margin-left:var(--rail)}
.foot__grid{max-width:var(--maxw);margin:0 auto 50px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
.foot__brand{font-family:var(--ff-mono);letter-spacing:.14em;font-size:15px}
.foot__brand span{color:var(--brass)}
.foot__col{display:flex;flex-direction:column;gap:10px}
.foot__col .mono{font-size:10px;color:var(--fog);letter-spacing:.18em;margin-bottom:4px}
.foot__col a{font-size:13px;color:#CFCDC6}
.foot__col a:hover{color:var(--brass)}
.foot__legal{max-width:var(--maxw);margin:0 auto;font-size:10px;color:var(--fog);line-height:1.8;border-top:1px solid var(--line);padding-top:22px}

/* scroll reveal */
.rv{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.rv.on{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .sec__grid{grid-template-columns:1fr;gap:36px}
  .layers li{grid-template-columns:52px 1fr;grid-template-rows:auto auto}
  .layers li p{grid-column:2}
  .four{grid-template-columns:repeat(2,1fr)}
  .grid6{grid-template-columns:repeat(2,1fr)}
  .svc{grid-template-columns:1fr}
  .foot__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  :root{--rail:0px}
  .rail{display:none}
  main{padding-left:0}
  .bar{padding:12px 16px;gap:14px}
  .bar__nav{display:none}
  .sec{padding:80px 6vw}
  .four{grid-template-columns:1fr}
  .grid6{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:1fr 1fr}
  .hero__inner{padding-bottom:16vh}
  .chip{right:12px;bottom:12px}
  .foot{margin-left:0}
}
@media (max-width:460px){
  .grid6{grid-template-columns:1fr}
}

@media (max-height:640px){
  .rail{gap:8px}
  .rail em{display:none}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero__title .line{animation:none;opacity:1;transform:none}
  .rv{opacity:1;transform:none;transition:none}
  .four__card,.ct__big,.chip{transition:none}
}