/* =========================================================
   common.css — 全ページ共通スタイル
   （変数 / リセット / ヘッダー / ボタン / 装飾プレート /
     フッター / スクロールリビール / 共通レスポンシブ）
   ========================================================= */

:root{
  --white:#FFFFFF;
  --ink:#111111;
  --body:#333333;
  --sub:#666666;
  --border:#E5E5E5;
  --line:#EDEDED;
  --gray:#F0F0F0;
  --gray-soft:#F7F7F7;
  --maxw:1320px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Noto Sans JP",-apple-system,BlinkMacSystemFont,sans-serif;
  color:var(--body);
  background:var(--white);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  letter-spacing:.01em;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px;}

/* ===== Header ===== */
header{
  position:sticky;top:0;z-index:100;height:80px;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease), background .3s var(--ease);
}
header.scrolled{border-bottom-color:var(--border);background:rgba(255,255,255,.94);}
.nav{display:flex;align-items:center;height:80px;gap:48px;}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:22px;color:var(--ink);letter-spacing:.02em;}
.brand .mark{width:26px;height:26px;flex:none;}
.logo-img{height:26px;width:auto;display:block;}
.nav-links{display:flex;gap:38px;margin-left:auto;}
.nav-links a{
  font-size:14.5px;font-weight:500;color:var(--body);position:relative;padding:6px 0;
  transition:color .25s var(--ease);
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1.5px;width:0;background:var(--ink);
  transition:width .3s var(--ease);
}
.nav-links a:hover,.nav-links a.active{color:var(--ink);}
.nav-links a:hover::after,.nav-links a.active::after{width:100%;}
.lang{display:flex;align-items:center;gap:9px;font-size:13.5px;font-weight:500;color:var(--sub);}
.lang button{background:none;border:none;font:inherit;color:var(--sub);cursor:pointer;padding:2px 1px;transition:color .2s;}
.lang button.active{color:var(--ink);font-weight:700;}
.lang button:hover{color:var(--ink);}
.lang .div{width:1px;height:13px;background:var(--border);}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:54px;padding:0 30px;border-radius:5px;font-size:15px;font-weight:700;
  cursor:pointer;transition:transform .2s var(--ease), background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease), box-shadow .25s var(--ease);
  white-space:nowrap;
}
.btn .arr{transition:transform .25s var(--ease);}
.btn:hover .arr{transform:translateX(4px);}
.btn-primary{background:var(--ink);color:var(--white);border:1px solid var(--ink);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(17,17,17,.18);}
.btn-secondary{background:var(--white);color:var(--ink);border:1px solid #CCCCCC;}
.btn-secondary:hover{border-color:var(--ink);transform:translateY(-2px);}

/* ===== Decorative plates (sub-page hero visuals: recruit / use_cases) ===== */
.plates{position:absolute;inset:0;}
.plate{
  position:absolute;border-radius:3px;
  background:linear-gradient(135deg,#ffffff 0%,#f4f4f5 55%,#e9e9ec 100%);
  box-shadow:0 24px 60px -28px rgba(17,17,17,.28), 0 2px 8px rgba(17,17,17,.05);
  border:1px solid rgba(255,255,255,.9);
  overflow:hidden;
}
.plate::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(118deg,rgba(17,17,17,.028) 0 1px,transparent 1px 7px);
  opacity:.9;
}
.plate::after{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:rgba(255,255,255,.95);}
.p1{width:74%;height:60%;right:-4%;top:-6%;transform:rotate(-19deg);z-index:4;}
.p2{width:74%;height:60%;right:1%;top:6%;transform:rotate(-19deg);z-index:3;opacity:.92;}
.p3{width:74%;height:60%;right:6%;top:18%;transform:rotate(-19deg);z-index:2;opacity:.84;}
.p4{width:74%;height:60%;right:11%;top:30%;transform:rotate(-19deg);z-index:1;opacity:.72;}

/* ===== Footer ===== */
footer{border-top:1px solid var(--border);padding:56px 0 40px;}
.foot-top{display:flex;align-items:flex-start;gap:60px;}
.foot-brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:21px;color:var(--ink);}
.foot-brand .mark{width:24px;height:24px;}
.foot-brand .logo-img{height:24px;}
.foot-nav{display:grid;grid-template-columns:repeat(5,auto);gap:18px 40px;margin-top:4px;}
.foot-nav a{font-size:14px;font-weight:500;color:var(--body);transition:color .2s;}
.foot-nav a:hover{color:var(--ink);}
.foot-sns{margin-left:auto;display:flex;gap:16px;align-items:center;}
.foot-sns a{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  color:var(--ink);border:1px solid var(--border);transition:background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);}
.foot-sns a:hover{background:var(--ink);color:#fff;transform:translateY(-2px);}
.foot-sns svg{width:17px;height:17px;}
.foot-bottom{margin-top:44px;padding-top:24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;}
.foot-bottom .copy{font-size:12.5px;color:var(--sub);letter-spacing:.03em;}
.foot-bottom .links{display:flex;gap:26px;}
.foot-bottom .links a{font-size:12.5px;color:var(--sub);}
.foot-bottom .links a:hover{color:var(--ink);}

/* ===== Scroll reveal ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease), transform .7s var(--ease);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1!important;transform:none!important;}}

/* ===== Common responsive ===== */
@media (max-width:860px){
  .nav-links{display:none;}
  .foot-top{flex-direction:column;gap:32px;}
  .foot-sns{margin-left:0;}
  .foot-bottom{flex-direction:column;gap:16px;align-items:flex-start;}
}
@media (max-width:560px){
  .wrap{padding:0 20px;}
}