/* プレミアムステージ合同会社 ------------------------------------------ */
:root{
  --bg:#F8F7F6;
  --ink:#1A1A1A;
  --sub:#6B6B6B;
  --line:#E5E3E0;
  --white:#fff;
  --en:"Montserrat",-apple-system,"Helvetica Neue",sans-serif;
  --jp:"Hiragino Kaku Gothic ProN","ヒラギノ角ゴ ProN W3","Noto Sans JP",sans-serif;
  --gutter:clamp(20px,5vw,64px);
  --sec:clamp(80px,12vw,180px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--jp);font-size:16px;line-height:1.9;
  letter-spacing:.04em;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{font-weight:600;line-height:1.4;margin:0}
p{margin:0}
ul{margin:0;padding:0;list-style:none}

.inner{width:min(1200px,100% - var(--gutter)*2);margin-inline:auto}
.inner--narrow{width:min(760px,100% - var(--gutter)*2)}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px}
.skip:focus{left:var(--gutter);top:12px;z-index:100;background:var(--ink);color:#fff;padding:10px 16px}

.label{font-family:var(--en);font-size:13px;letter-spacing:.16em;margin:0 0 18px}
.heading{font-size:clamp(24px,3.4vw,34px);letter-spacing:.08em;margin:0 0 clamp(32px,5vw,56px)}

/* リンク（テキスト＋矢印） ------------------------------------------- */
.link{
  display:inline-flex;align-items:center;gap:.7em;
  font-size:15px;letter-spacing:.1em;text-decoration:none;
  padding:14px 0;min-height:44px;background:none;border:0;
  border-bottom:1px solid currentColor;cursor:pointer;font-family:inherit;color:inherit;
}
.link::after{content:"";width:22px;height:1px;background:currentColor;transition:transform .3s ease}
.link:hover::after,.link:focus-visible::after{transform:translateX(6px)}
.link--lg{font-size:clamp(15px,1.6vw,17px)}
.ext{width:9px;height:9px;border:1px solid currentColor;border-left:0;border-bottom:0;
     transform:rotate(45deg);display:inline-block;margin-left:.2em}

/* ヘッダー ------------------------------------------------------------ */
.header{position:fixed;inset:0 0 auto;z-index:50;transition:background .4s ease,border-color .4s}
.header__inner{display:flex;align-items:center;justify-content:space-between;
  width:min(1400px,100% - var(--gutter)*2);margin-inline:auto;height:78px}
.logo{font-family:var(--en);font-size:16px;letter-spacing:.18em;text-decoration:none}
.nav ul{display:flex;gap:clamp(18px,2.6vw,38px)}
.nav a{font-family:var(--en);font-size:12.5px;letter-spacing:.14em;text-decoration:none;
  display:inline-flex;align-items:center;gap:.35em;padding:6px 0}
.nav a:hover{opacity:.6}
.page--index .header{color:var(--white)}
.header.is-scrolled{background:var(--bg);color:var(--ink);border-bottom:1px solid var(--line)}
.page--company .header,.page--contact .header,.page--privacy .header{background:var(--bg);border-bottom:1px solid var(--line)}
.burger{display:none;width:44px;height:44px;background:none;border:0;padding:0;cursor:pointer;color:inherit}
.burger span{display:block;width:22px;height:1px;background:currentColor;margin:5px auto;transition:transform .3s,opacity .3s}

/* ヒーロー ------------------------------------------------------------ */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;color:var(--white);overflow:hidden}
.hero__media{position:absolute;inset:0}
.hero__media img{width:100%;height:100%;object-fit:cover}
.hero::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.62) 0%,rgba(0,0,0,.18) 45%,rgba(0,0,0,.72) 100%)}
.hero__body{position:relative;z-index:1;width:min(1400px,100% - var(--gutter)*2);margin-inline:auto;padding-top:60px}
.hero__title{font-family:var(--en);font-size:clamp(46px,10vw,116px);line-height:1.02;letter-spacing:.01em}
.hero__title span{display:block}
.hero__sub{margin-top:clamp(20px,3vw,34px);font-size:clamp(14px,1.7vw,18px);letter-spacing:.12em}
.hero__scroll{position:absolute;right:calc(var(--gutter) - 6px);top:50%;z-index:1;
  font-family:var(--en);font-size:11px;letter-spacing:.34em;writing-mode:vertical-rl;transform:translateY(-50%)}

/* 反転セクション ------------------------------------------------------ */
.section--dark{position:relative;color:var(--white);overflow:hidden;
  padding-block:clamp(110px,16vw,220px)}
.section--dark img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.mission__media,.cta__media{position:absolute;inset:0}
.mission::after,.cta::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.72) 0%,rgba(0,0,0,.58) 50%,rgba(0,0,0,.82) 100%)}
.mission__body,.cta__body{position:relative;z-index:1}
.mission__copy{font-size:clamp(22px,3.4vw,34px);letter-spacing:.06em;margin-bottom:clamp(24px,4vw,40px);max-width:22em}
.mission__text{max-width:44em;font-size:15px;color:rgba(255,255,255,.86)}
.cta__text{font-size:clamp(15px,2vw,19px);margin-bottom:26px;color:rgba(255,255,255,.9)}

/* 事業領域 ------------------------------------------------------------ */
.business{padding-block:var(--sec)}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(28px,4vw,56px)}
.card__media{overflow:hidden;margin-bottom:24px;aspect-ratio:3/2;background:var(--line)}
.card__media img{width:100%;height:100%;object-fit:cover;transition:transform .7s ease}
.card:hover .card__media img{transform:scale(1.03)}
.badge{display:inline-block;font-family:var(--en);font-size:11px;letter-spacing:.14em;
  color:var(--sub);border:1px solid var(--line);padding:5px 12px;margin-bottom:16px}
.card__title{font-size:clamp(19px,2.2vw,23px);letter-spacing:.06em;margin-bottom:14px}
.card__text{font-size:15px;color:var(--sub)}
.card .link{margin-top:6px}
.business__next{margin-top:clamp(40px,6vw,72px);padding-top:clamp(28px,4vw,40px);
  border-top:1px solid var(--line);font-size:14px;color:var(--sub)}

/* 動画 ---------------------------------------------------------------- */
.latest{padding-block:var(--sec);background:#F2F1EF}
.latest.is-empty{display:none}
.videos{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,36px);margin-bottom:clamp(32px,5vw,52px)}
.video{text-decoration:none;display:block}
.video__thumb{display:block;overflow:hidden;aspect-ratio:16/9;background:var(--line);margin-bottom:14px}
.video__thumb img{width:100%;height:100%;object-fit:cover;transition:transform .7s ease}
.video:hover .video__thumb img{transform:scale(1.04)}
.video__date{display:block;font-family:var(--en);font-size:11px;letter-spacing:.12em;color:var(--sub);margin-bottom:6px}
.video__title{display:block;font-size:14.5px;line-height:1.7}

.featured{padding-block:var(--sec)}
.featured.is-empty{display:none}
.fv{display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(24px,4vw,52px);
  align-items:center;text-decoration:none;color:inherit}
.fv__thumb{display:block;overflow:hidden;aspect-ratio:16/9;background:var(--line)}
.fv__thumb img{width:100%;height:100%;object-fit:cover;transition:transform .7s ease}
.fv:hover .fv__thumb img{transform:scale(1.03)}
.fv__body{display:block}
.fv__title{display:block;font-size:clamp(17px,2vw,21px);line-height:1.75;
  letter-spacing:.04em;margin-bottom:18px}
.fv__note{display:block;font-size:14.5px;color:var(--sub);margin-bottom:20px}

/* 下層ページ ---------------------------------------------------------- */
.pagehead{padding:calc(78px + clamp(60px,9vw,110px)) 0 clamp(40px,6vw,70px);border-bottom:1px solid var(--line)}
.pagehead__title{font-size:clamp(26px,4vw,40px);letter-spacing:.08em}
.block{padding-block:clamp(64px,9vw,120px)}
.block--tint{background:#F2F1EF}
.block__copy{font-size:clamp(20px,3vw,29px);letter-spacing:.06em;margin-bottom:26px}
.block__text{font-size:15px;color:var(--sub)}
.note{margin-top:20px;font-size:13.5px;color:var(--sub);border-left:2px solid var(--line);padding-left:16px}

.values{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(28px,4vw,48px)}
.value h3{font-size:18px;letter-spacing:.06em;margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.value p{font-size:14.5px;color:var(--sub)}

.deflist>div{display:grid;grid-template-columns:200px 1fr;gap:20px;
  padding:22px 0;border-bottom:1px solid var(--line)}
.deflist>div:first-child{border-top:1px solid var(--line)}
.deflist dt{font-size:14px;letter-spacing:.08em;color:var(--sub)}
.deflist dd{margin:0;font-size:15px}

/* フォーム ------------------------------------------------------------ */
.form{margin-top:clamp(36px,5vw,56px)}
.form__row{display:block;margin-bottom:26px}
.form__row label{display:block;font-size:14px;letter-spacing:.06em;margin-bottom:10px}
.req{font-size:11px;letter-spacing:.1em;color:#8a3b3b;border:1px solid #d9c2c2;padding:2px 7px;margin-left:6px}
.form input[type=text],.form input[type=email],.form select,.form textarea{
  width:100%;padding:14px 16px;font:inherit;font-size:15px;color:var(--ink);
  background:var(--white);border:1px solid var(--line);border-radius:0;min-height:52px}
.form textarea{min-height:180px;resize:vertical}
.form :focus-visible{outline:2px solid var(--ink);outline-offset:1px}
.form__check{display:flex;align-items:flex-start;gap:12px;margin:34px 0 0;font-size:14.5px}
.form__check input{width:20px;height:20px;margin-top:3px;flex:none}
.form__submit{margin-top:16px}
.hp{position:absolute;left:-9999px}

/* 文書ページ ---------------------------------------------------------- */
.doc h2{font-size:17px;letter-spacing:.06em;margin:44px 0 14px}
.doc p,.doc li{font-size:15px;color:var(--sub)}
.doc ul{list-style:disc;padding-left:1.4em;margin:10px 0}
.doc__date{margin-top:52px;padding-top:20px;border-top:1px solid var(--line);font-size:13px}

/* パンくず・フッター --------------------------------------------------- */
.crumbs{border-top:1px solid var(--line);padding:22px 0;font-family:var(--en);font-size:11.5px;letter-spacing:.12em;color:var(--sub)}
.crumbs .inner{display:flex;gap:12px;align-items:center}
.crumbs a{text-decoration:none}
.crumbs a:hover{opacity:.6}

.footer{border-top:1px solid var(--line);padding-block:clamp(48px,7vw,80px)}
.footer__inner{width:min(1400px,100% - var(--gutter)*2);margin-inline:auto;
  display:flex;flex-direction:column;gap:26px}
.logo--footer{font-size:15px}
.footer__nav ul{display:flex;flex-wrap:wrap;gap:26px}
.footer__nav a{font-family:var(--en);font-size:12px;letter-spacing:.14em;text-decoration:none;
  display:inline-flex;align-items:center;gap:.35em}
.footer__nav a:hover{opacity:.6}
.footer__sub{display:flex;gap:26px}
.footer__sub a{font-family:var(--en);font-size:11.5px;letter-spacing:.12em;color:var(--sub);text-decoration:none}
.copyright{font-family:var(--en);font-size:11px;letter-spacing:.1em;color:var(--sub);margin-top:8px}

/* 出現アニメーション --------------------------------------------------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .8s ease,transform .8s ease}
.reveal.is-in{opacity:1;transform:none}

/* レスポンシブ --------------------------------------------------------- */
@media (max-width:900px){
  .fv{grid-template-columns:1fr;gap:22px}
  .cards,.values{grid-template-columns:1fr}
  .videos{grid-template-columns:1fr;gap:28px}
  .deflist>div{grid-template-columns:1fr;gap:6px}
  .hero__scroll{display:none}
  .burger{display:block}
  .nav{position:fixed;inset:0;background:var(--bg);color:var(--ink);
    display:flex;align-items:center;justify-content:center;
    opacity:0;visibility:hidden;transition:opacity .35s ease,visibility .35s}
  .nav.is-open{opacity:1;visibility:visible}
  .nav ul{flex-direction:column;gap:28px;text-align:center}
  .nav a{font-size:15px;letter-spacing:.18em;justify-content:center}
  body.is-menu-open{overflow:hidden}
  body.is-menu-open .header{color:var(--ink)}
  .burger.is-open span:first-child{transform:translateY(3px) rotate(45deg)}
  .burger.is-open span:last-child{transform:translateY(-3px) rotate(-45deg)}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

.thanks__back{margin-top:40px}

/* 差し色（案B・2026-09-13） ------------------------------------------ */
:root{--accent:#1F6F6B;--tint:#EEEBE6}
.label{color:var(--accent);font-weight:600}
.section--dark .label{color:var(--white);font-weight:400}
.heading::after,.pagehead__title::after{content:"";display:block;width:48px;height:3px;background:var(--accent);margin-top:18px}
.badge{color:var(--accent);border-color:var(--accent)}
.business .link,.featured .link,.latest .link,.deflist a{color:var(--accent)}
.business__next{border-top:2px solid var(--accent)}
.featured{background:var(--tint)}
.latest{background:var(--bg)}
.block--tint{background:var(--tint)}