/* =========================================================
   立花プロパティマネージメント コーポレートサイト プロトタイプ
   案A『時を継ぐ』 Hero + 沿革
   パレット: 墨 / 紙白 / 雷門の朱 / 暖灰 / 罫 / 濃墨 / 焦茶
   ルール: ダッシュ不使用・色付き縦罫不使用・bg+colorペア・WCAG AA以上
   ========================================================= */

:root{
  --sumi:#1C1A17;
  --washi:#F7F3EC;
  --shu:#B7352A;
  --gray:#6E665C;
  --hair:#DED7CB;
  --deep:#161310;
  --brown:#48312E;
  --white:#FFFFFF;

  --serif:"Shippori Mincho", serif;
  --sans:"Noto Sans JP", system-ui, sans-serif;

  --maxw:1180px;
  --ease:cubic-bezier(.4,0,.2,1);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--washi);
  color:var(--sumi);
  font-family:var(--sans);
  font-weight:400;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  /* 紙の質感（極薄ノイズ） */
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
}
img{max-width:100%;display:block;}
figure{margin:0;}
a{color:inherit;text-decoration:none;}

.pc-br{display:inline;}
@media (max-width:880px){.pc-br{display:none;}}

/* ===================== Header ===================== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;gap:24px;
  padding:18px clamp(20px,4vw,52px);
  transition:background .4s var(--ease), box-shadow .4s var(--ease), padding .4s var(--ease);
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.brand__mark{width:38px;height:38px;object-fit:contain;}
.brand__name{
  font-family:var(--serif);font-weight:600;font-size:1.02rem;letter-spacing:.06em;
  color:var(--washi);text-shadow:0 1px 12px rgba(0,0,0,.5);
  transition:color .4s var(--ease), text-shadow .4s var(--ease);
}
.nav{display:flex;gap:clamp(16px,1.8vw,30px);margin-left:auto;}
.nav a{
  font-size:.86rem;letter-spacing:.04em;color:var(--washi);
  text-shadow:0 1px 10px rgba(0,0,0,.55);
  padding-bottom:4px;position:relative;transition:color .4s var(--ease),text-shadow .4s var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:currentColor;
  transition:width .35s var(--ease);
}
.nav a:hover::after{width:100%;}
.header__right{display:flex;align-items:center;gap:18px;}
.lang{font-size:.82rem;color:var(--washi);text-shadow:0 1px 10px rgba(0,0,0,.55);transition:color .4s var(--ease);}
.lang strong{font-weight:700;}
.lang__sep{opacity:.5;margin:0 2px;}
.btn-shu{
  background:var(--shu);color:var(--white);
  font-size:.82rem;letter-spacing:.06em;font-weight:500;
  padding:9px 18px;border-radius:2px;
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.btn-shu:hover{background:#9E2C22;transform:translateY(-1px);}

/* scrolled state */
.site-header.scrolled{
  background:rgba(247,243,236,.92);
  backdrop-filter:blur(10px) saturate(1.1);
  -webkit-backdrop-filter:blur(10px) saturate(1.1);
  box-shadow:0 1px 0 var(--hair);
  padding-top:12px;padding-bottom:12px;
}
.site-header.scrolled .brand__name{color:var(--sumi);text-shadow:none;}
.site-header.scrolled .nav a{color:var(--sumi);text-shadow:none;}
.site-header.scrolled .lang{color:var(--sumi);text-shadow:none;}

/* hamburger */
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;margin-left:auto;}
.hamburger span{display:block;width:26px;height:2px;background:var(--washi);transition:.3s var(--ease);}
.site-header.scrolled .hamburger span{background:var(--sumi);}

@media (max-width:880px){
  .nav,.header__right{display:none;}
  .hamburger{display:flex;}
}

/* mobile menu */
.m-menu{
  position:fixed;inset:0;z-index:49;background:var(--washi);
  display:flex;flex-direction:column;justify-content:center;gap:8px;
  padding:80px 32px 40px;
  transform:translateY(-100%);transition:transform .5s var(--ease);
}
.m-menu.open{transform:translateY(0);}
.m-menu__nav{display:flex;flex-direction:column;gap:6px;}
.m-menu__nav a{font-family:var(--serif);font-size:1.5rem;color:var(--sumi);padding:12px 0;border-bottom:1px solid var(--hair);}
.m-menu__foot{display:flex;align-items:center;justify-content:space-between;margin-top:28px;}
.m-menu__foot .lang{color:var(--sumi);text-shadow:none;}

/* ===================== S1 Hero ===================== */
.hero{position:relative;height:100dvh;min-height:560px;overflow:hidden;isolation:isolate;}
.hero__stage{position:absolute;inset:0;z-index:0;}
.hero__frame{
  position:absolute;inset:0;background-image:var(--pc-img);background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.8s var(--ease);
  transform:scale(1.015);
}
.hero__frame.is-active{opacity:1;transform:scale(1.045);transition:opacity 1.8s var(--ease),transform 8s linear;}
.hero__scrim{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(to top, rgba(22,19,16,.78) 0%, rgba(22,19,16,.30) 38%, rgba(22,19,16,.08) 62%, rgba(22,19,16,.34) 100%),
    linear-gradient(to right, rgba(22,19,16,.45) 0%, rgba(22,19,16,0) 55%);
}
.hero__copy{position:absolute;z-index:2;left:clamp(24px,5vw,72px);bottom:clamp(64px,12vh,120px);}
.hero__h1{
  margin:0;
  display:flex;
  flex-direction:row-reverse;
  align-items:flex-start;
  gap:clamp(16px,2.5vw,34px);
  font-family:var(--serif);font-weight:600;
  font-size:clamp(2.4rem,7vh,4.6rem);
  line-height:1.1;letter-spacing:.08em;
  color:var(--washi);
  text-shadow:0 2px 30px rgba(0,0,0,.5);
}
.hero__h1 span{
  writing-mode:vertical-rl;
  white-space:nowrap;
  display:block;
}
.hero__sub{
  writing-mode:horizontal-tb;
  margin:22px 0 0;max-width:30ch;
  font-size:clamp(.82rem,1.5vw,.96rem);line-height:1.95;
  color:rgba(247,243,236,.92);text-shadow:0 1px 14px rgba(0,0,0,.6);
}
.hero__scroll{
  position:absolute;z-index:2;right:clamp(22px,4vw,52px);bottom:48px;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-size:.66rem;letter-spacing:.28em;color:var(--washi);writing-mode:vertical-rl;
}
.hero__scroll-line{width:1px;height:54px;background:linear-gradient(var(--washi),transparent);}

/* ===================== S2 Intro ===================== */
.intro{
  position:relative;
  z-index:2;
  max-width:var(--maxw);margin:0 auto;
  margin-top:-120px;
  padding:clamp(90px,14vh,170px) clamp(24px,5vw,52px) clamp(60px,8vh,100px);
  display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,5vw,70px);align-items:start;
  background:var(--washi);
  box-shadow:0 0 0 100vmax var(--washi);
  clip-path:inset(-180px -100vmax 0 -100vmax);
}
.intro::before{
  content:"";
  position:absolute;
  left:50%;
  top:-180px;
  width:100vw;
  height:180px;
  transform:translateX(-50%);
  background:var(--washi);
}
.intro > *{
  position:relative;
  z-index:1;
}
.intro__eyebrow{font-size:.78rem;letter-spacing:.14em;color:var(--gray);margin:0 0 18px;}
.intro__h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(1.9rem,4vw,3rem);line-height:1.35;letter-spacing:.04em;margin:0;
}
.intro__h2 span{
  display:block;
  white-space:nowrap;
}
.intro__body{padding-top:10px;}
.intro__body p{margin:0 0 18px;font-size:.98rem;color:#2b2722;}
.stats{
  grid-column:1 / -1;
  display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,4vw,52px);
  margin-top:clamp(40px,6vh,72px);padding-top:clamp(36px,5vh,56px);
  border-top:1px solid var(--hair);
}
.stat{display:flex;flex-direction:column;gap:10px;}
.stat__num{font-family:var(--serif);font-weight:600;font-size:clamp(2rem,5vw,3.4rem);line-height:1;color:var(--sumi);}
.stat__unit{font-size:.42em;margin-left:.18em;color:var(--gray);}
.stat__label{font-size:.82rem;color:var(--gray);letter-spacing:.02em;}

@media (max-width:880px){
  .site-header{
    padding:14px 28px;
  }
  .site-header.scrolled{
    padding-top:10px;
    padding-bottom:10px;
  }
  .brand__mark{
    width:34px;
    height:34px;
  }
  .brand__name{
    font-size:.94rem;
    letter-spacing:.04em;
  }
  .hero{
    min-height:0;
  }
  .hero__frame{
    background-image:var(--sp-img, var(--pc-img));
    background-position:center center;
    transform:scale(1.02);
  }
  .hero__frame.is-active{
    transform:scale(1.065);
  }
  .hero__copy{
    left:clamp(28px,6vw,52px);
    bottom:clamp(150px,22vh,280px);
  }
  .hero__h1{
    font-size:clamp(3rem,12vw,4.5rem);
    gap:clamp(18px,4vw,30px);
    letter-spacing:.05em;
  }
  .hero__sub{
    margin-top:18px;
    max-width:23ch;
  }
  .intro{grid-template-columns:1fr;gap:24px;}
  .intro__h2 span{
    white-space:normal;
  }
  .stats{grid-template-columns:1fr;gap:26px;}
  .stat{flex-direction:row;align-items:baseline;gap:16px;}
  .stat__num{font-size:2.2rem;}
}

/* ===================== S4 Business sequence ===================== */
.bizseq{
  position:relative;
  background:#f7f3ec;
  color:#1c1a17;
  overflow:clip;
  transition:background-color .9s ease,color .9s ease;
}
.bizseq__intro{
  max-width:1180px;
  margin:0 auto;
  padding:14vh 7vw 2vh;
}
.bizseq__eyebrow{
  font-size:.78rem;
  letter-spacing:.32em;
  color:#b7352a;
  margin:0 0 16px;
  text-transform:uppercase;
}
.bizseq__title{
  font-family:"Shippori Mincho",serif;
  font-weight:700;
  font-size:clamp(28px,5vw,54px);
  line-height:1.16;
  margin:0 0 18px;
  letter-spacing:.02em;
}
.bizseq__lead{
  font-size:clamp(14px,1.7vw,17px);
  line-height:1.95;
  max-width:48ch;
  opacity:.82;
  margin:0;
}
.bizseq__stage{
  display:grid;
  grid-template-columns:1fr 1fr;
  max-width:1180px;
  margin:0 auto;
  padding:0 7vw 6vh;
}
.bizseq__sticky{
  position:sticky;
  top:0;
  height:100vh;
  display:flex;
  align-items:center;
}
.bizseq__scenes{
  position:relative;
  width:100%;
  aspect-ratio:3/4;
  border-radius:4px;
  overflow:hidden;
  box-shadow:0 30px 70px rgba(0,0,0,.28);
}
.bizseq__scene{
  position:absolute;
  inset:0;
  opacity:0;
  transform:scale(1.06);
  transition:opacity .9s ease,transform 2.4s ease;
}
.bizseq__scene img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.bizseq__scene.is-active{
  opacity:1;
  transform:scale(1);
}
.bizseq__steps{
  display:flex;
  flex-direction:column;
  gap:36vh;
  padding:46vh 0 46vh 6vw;
}
.bizseq__step{
  opacity:.3;
  transition:opacity .6s ease;
}
.bizseq__step.is-active{
  opacity:1;
}
.bizseq__no{
  font-family:"Shippori Mincho",serif;
  font-size:1.05rem;
  color:#b7352a;
  letter-spacing:.1em;
}
.bizseq__name{
  font-family:"Shippori Mincho",serif;
  font-weight:600;
  font-size:clamp(20px,3vw,32px);
  margin:6px 0 16px;
  line-height:1.3;
}
.bizseq__text{
  font-size:clamp(13px,1.5vw,16px);
  line-height:1.95;
  max-width:34ch;
}
a.bcard{
  text-decoration:none;
  color:inherit;
  display:block;
}

@media (max-width:880px){
  .bizseq__intro{
    padding:10vh 7vw 0;
  }
  .bizseq__stage{
    grid-template-columns:1fr;
    padding:0 7vw 0;
  }
  .bizseq__sticky{
    top:54px;
    height:42vh;
    align-items:flex-start;
    padding-top:40px;
  }
  .bizseq__scenes{
    width:min(84vw,520px);
    margin:0 auto;
    aspect-ratio:16/10;
  }
  .bizseq__steps{
    gap:22vh;
    padding:32vh 0 12vh;
  }
  .bizseq__step{
    min-height:42vh;
    padding-top:5vh;
  }
}

/* ===================== S3 沿革 ===================== */
.history{
  background:var(--deep);color:var(--washi);
  padding:clamp(80px,12vh,150px) clamp(24px,5vw,52px);
}
.history__head{max-width:var(--maxw);margin:0 auto clamp(50px,7vh,90px);}
.section-eyebrow{font-size:.74rem;letter-spacing:.22em;color:var(--shu);margin:0 0 16px;font-weight:500;}
.history__title{font-family:var(--serif);font-weight:600;font-size:clamp(1.9rem,4.6vw,3.2rem);margin:0 0 22px;letter-spacing:.05em;}
.history__intro{max-width:46ch;color:rgba(247,243,236,.82);font-size:.96rem;margin:0;}

.timeline{max-width:var(--maxw);margin:0 auto;list-style:none;padding:0;}
.tl{
  display:grid;grid-template-columns:minmax(150px,200px) 1fr;gap:clamp(20px,4vw,56px);
  padding:clamp(30px,5vh,54px) 0;
  border-top:1px solid rgba(247,243,236,.14);
  opacity:0;transform:translateY(18px);transition:opacity .9s var(--ease),transform .9s var(--ease);
}
.tl.in{opacity:1;transform:none;}
.tl__year{
  font-family:var(--serif);font-weight:600;font-size:clamp(2.2rem,5vw,3.6rem);line-height:1;
  color:var(--washi);position:relative;padding-left:22px;
}
.tl__year::before{
  content:"";position:absolute;left:0;top:.35em;width:9px;height:9px;border-radius:50%;
  background:var(--shu);
}
.tl__era{display:block;margin-top:12px;padding-left:22px;font-size:.78rem;letter-spacing:.08em;color:rgba(247,243,236,.6);}
.tl__body h3{font-family:var(--serif);font-weight:500;font-size:clamp(1.1rem,2.4vw,1.5rem);margin:0 0 12px;color:var(--washi);}
.tl__body p{margin:0;font-size:.94rem;color:rgba(247,243,236,.78);max-width:54ch;}

.tl--now .tl__year{color:var(--shu);}
.tl--now .tl__body h3{color:var(--shu);}

@media (max-width:680px){
  .tl{grid-template-columns:1fr;gap:14px;}
  .tl__era{margin-top:4px;}
}

/* ===================== Footer ===================== */
.site-footer{background:var(--brown);color:var(--washi);padding:clamp(56px,8vh,84px) clamp(24px,5vw,52px) 40px;}
.footer__top{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1fr 1.3fr;gap:clamp(28px,5vw,64px);align-items:start;}
.footer__mark{width:46px;height:46px;object-fit:contain;margin-bottom:16px;}
.footer__name{font-family:var(--serif);font-size:1.1rem;font-weight:600;margin:0 0 6px;letter-spacing:.05em;}
.footer__en{font-size:.78rem;letter-spacing:.06em;color:rgba(247,243,236,.6);margin:0;}
.footer__info p{margin:0 0 8px;font-size:.9rem;color:rgba(247,243,236,.88);}
.footer__meta{font-size:.82rem !important;color:rgba(247,243,236,.6) !important;}
.footer__rule{max-width:var(--maxw);margin:36px auto 20px;border:0;border-top:1px solid rgba(247,243,236,.18);}
.footer__copy{max-width:var(--maxw);margin:0 auto;font-size:.76rem;color:rgba(247,243,236,.55);letter-spacing:.04em;}
.footer__note{max-width:var(--maxw);margin:14px auto 0;font-size:.74rem;line-height:1.8;color:rgba(247,243,236,.5);}

@media (max-width:680px){.footer__top{grid-template-columns:1fr;gap:24px;}}

/* ===================== reduced motion ===================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .hero__frame{transition:none;transform:none;}
  .hero__frame.is-active{transform:none;transition:none;}
  .bizseq{transition:none;}
  .bizseq__scene{transition:opacity .3s;transform:none;}
  .bizseq__step{opacity:1;}
  .tl{opacity:1;transform:none;transition:none;}
  *{animation:none !important;}
}