/* =========================================================
   DRAI - Drive Responsible AI
   合同会社 DRAI コーポレートサイト 共通スタイル
   ========================================================= */

:root{
  --bg:        #0a0a14;
  --bg-2:      #0e0e1a;
  --bg-card:   #16161f;
  --bg-card-2: #1c1c28;
  --fg:        #f4f3ee;
  --fg-soft:   #d8d6d0;
  --muted:     #9aa0b8;
  --accent:    #7d8fff;
  --accent-2:  #3b59ff;
  --accent-3:  #c4a8ff;
  --line:      rgba(255,255,255,.08);
  --line-2:    rgba(255,255,255,.16);
  --shadow:    0 24px 60px rgba(0,0,0,.4);
  --sans:      "Inter","Helvetica Neue","Hiragino Sans","Noto Sans JP","Yu Gothic",sans-serif;
  --mono:      "JetBrains Mono","SF Mono",Menlo,Consolas,monospace;
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 24px;
  --ease:    cubic-bezier(.2,.8,.2,1);
  --ease-in: cubic-bezier(.7,0,.84,0);
}

*{box-sizing:border-box;margin:0;padding:0;}
html,body{height:100%;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--fg);
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;height:auto;}
button{font:inherit;cursor:pointer;}

/* =========================================================
   起動カーテン
   ========================================================= */
.curtain{
  position:fixed;inset:0;background:var(--accent);
  z-index:200;display:flex;align-items:center;justify-content:center;
  pointer-events:none;
}
.curtain .ct-logo{
  font-size:clamp(60px,16vw,200px);
  font-weight:900;letter-spacing:-.04em;color:var(--bg);
  overflow:hidden;line-height:.9;
}
.curtain .ct-logo span{display:inline-block;}

/* =========================================================
   背景キャンバス（Three.js 粒子）
   ========================================================= */
.bg-canvas{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.55;
}

/* =========================================================
   ナビゲーション
   ========================================================= */
.nav{
  position:fixed;top:0;left:0;right:0;
  padding:22px 6vw;
  display:flex;justify-content:space-between;align-items:center;
  font-size:13px;letter-spacing:.18em;z-index:80;
  backdrop-filter:blur(14px);
  background:rgba(10,10,20,.7);
  border-bottom:1px solid var(--line);
}
.nav .logo{
  font-weight:900;font-size:20px;letter-spacing:.28em;
  display:inline-flex;align-items:center;gap:10px;
}
.nav .logo .logo-mark{
  width:24px;height:24px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,var(--accent) 0%,var(--accent-2) 70%);
  box-shadow:0 0 18px rgba(125,143,255,.45);
}
.nav-links{display:flex;align-items:center;gap:28px;}
.nav-links a{
  color:var(--muted);font-weight:600;letter-spacing:.18em;font-size:12px;
  transition:color .2s var(--ease),transform .2s var(--ease);
  position:relative;
}
.nav-links a:hover,.nav-links a.is-current{color:var(--fg);}
.nav-links a.is-current::after{
  content:"";position:absolute;left:50%;bottom:-6px;width:5px;height:5px;
  background:var(--accent);border-radius:50%;transform:translateX(-50%);
  box-shadow:0 0 10px var(--accent);
}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border-radius:999px;
  background:var(--accent);color:var(--bg);
  font-weight:700;font-size:12.5px;letter-spacing:.1em;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(125,143,255,.45);}

/* モバイル簡易ナビ */
@media(max-width:780px){
  .nav{padding:18px 5vw;}
  .nav-links{gap:18px;}
  .nav-links a:not(.nav-cta){display:none;}
}

/* =========================================================
   共通レイアウト
   ========================================================= */
.section{
  position:relative;padding:140px 6vw;
}
.section.pad-tight{padding:90px 6vw;}
.section.bg-alt{background:var(--bg-2);}
.container{max-width:1240px;margin:0 auto;}

.sec-label{
  color:var(--accent);
  font-size:12px;letter-spacing:.36em;font-weight:700;
  margin-bottom:24px;display:inline-block;
}
.sec-title{
  font-size:clamp(34px,5vw,60px);
  font-weight:800;line-height:1.18;letter-spacing:-.02em;
  margin-bottom:34px;
}
.sec-title .acc{color:var(--accent);}
.sec-lead{
  font-size:16.5px;line-height:1.95;color:var(--muted);
  max-width:680px;margin-bottom:60px;
}

/* =========================================================
   ヒーロー
   ========================================================= */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:center;
  padding:0 6vw;overflow:hidden;
}
.hero .container{position:relative;z-index:2;}
.hero .kicker{
  color:var(--accent);font-size:13px;letter-spacing:.36em;
  margin-bottom:30px;overflow:hidden;
}
.hero .kicker span{display:inline-block;}
.hero h1{
  font-size:clamp(48px,8.4vw,116px);
  font-weight:900;line-height:1.04;letter-spacing:-.03em;
  margin-bottom:36px;overflow:hidden;
}
.hero h1 .row{display:block;overflow:hidden;}
.hero h1 .row > span{display:inline-block;}
.hero h1 .acc{
  color:transparent;
  background:linear-gradient(120deg,var(--accent) 0%,var(--accent-3) 50%,var(--accent) 100%);
  -webkit-background-clip:text;background-clip:text;
}
.hero .lead{
  font-size:17px;line-height:1.9;color:var(--muted);
  max-width:560px;margin-bottom:54px;overflow:hidden;
}
.hero .lead span{display:inline-block;}
.hero .cta-row{display:flex;gap:16px;flex-wrap:wrap;}

/* ページタイトル（サブページ用） */
.page-head{
  padding:180px 6vw 90px;position:relative;border-bottom:1px solid var(--line);
}
.page-head .container{position:relative;z-index:2;}
.page-head .kicker{
  color:var(--accent);font-size:12px;letter-spacing:.36em;font-weight:700;
  margin-bottom:20px;display:block;
}
.page-head h1{
  font-size:clamp(40px,6vw,80px);font-weight:900;
  line-height:1.1;letter-spacing:-.02em;margin-bottom:24px;
}
.page-head h1 .acc{color:var(--accent);}
.page-head .lead{
  font-size:17px;color:var(--muted);max-width:680px;line-height:1.9;
}

/* =========================================================
   ボタン
   ========================================================= */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:12px;
  padding:18px 32px;border-radius:999px;
  font-weight:700;font-size:15px;letter-spacing:.06em;
  position:relative;overflow:hidden;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),color .3s var(--ease);
  border:none;
}
.btn-primary{
  background:var(--accent);color:var(--bg);
}
.btn-primary::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(120deg,var(--accent-3),var(--accent));
  transform:translateX(-101%);transition:transform .5s var(--ease);
  z-index:0;
}
.btn-primary:hover{
  transform:translateY(-3px);
  box-shadow:0 16px 38px rgba(125,143,255,.45);
}
.btn-primary:hover::before{transform:translateX(0);}
.btn-primary span{position:relative;z-index:1;}

.btn-ghost{
  background:transparent;color:var(--fg);
  border:1.5px solid var(--line-2);
}
.btn-ghost:hover{
  border-color:var(--accent);color:var(--accent);transform:translateY(-3px);
}
.btn .arrow{display:inline-block;transition:transform .3s var(--ease);}
.btn:hover .arrow{transform:translateX(6px);}

/* =========================================================
   マーキー（横流れテキスト）
   ========================================================= */
.marquee{
  padding:80px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  overflow:hidden;white-space:nowrap;
}
.marquee-track{
  display:inline-block;
  font-size:clamp(50px,10vw,140px);font-weight:900;
  letter-spacing:-.03em;line-height:1;
  color:rgba(244,243,238,.06);
}
.marquee-track .acc{color:rgba(125,143,255,.5);}

/* =========================================================
   サービスカード（3カラム）
   ========================================================= */
.svc-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
@media(max-width:920px){.svc-grid{grid-template-columns:1fr;}}
.svc-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  padding:48px 36px 42px;
  border-radius:var(--r-md);
  position:relative;overflow:hidden;
  transition:transform .4s var(--ease),border-color .4s var(--ease),box-shadow .4s var(--ease);
}
.svc-card::before{
  content:"";position:absolute;left:0;top:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--accent),var(--accent-3));
  transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease);
}
.svc-card:hover{
  transform:translateY(-6px);
  border-color:var(--line-2);
  box-shadow:var(--shadow);
}
.svc-card:hover::before{transform:scaleX(1);}
.svc-card .num{
  position:absolute;top:24px;right:30px;
  font-size:13px;color:var(--muted);letter-spacing:.32em;font-family:var(--mono);
}
.svc-card .ct{
  display:inline-block;color:var(--accent);
  font-size:11.5px;letter-spacing:.36em;font-weight:700;
  margin-bottom:22px;
}
.svc-card h3{
  font-size:23px;font-weight:800;margin-bottom:18px;line-height:1.45;
}
.svc-card p{
  font-size:14.5px;line-height:1.95;color:var(--muted);
}
.svc-card .more{
  display:inline-flex;align-items:center;gap:8px;margin-top:22px;
  font-size:13px;color:var(--accent);font-weight:700;letter-spacing:.06em;
}
.svc-card .more .arrow{transition:transform .3s var(--ease);}
.svc-card:hover .more .arrow{transform:translateX(6px);}

/* =========================================================
   About 2カラム
   ========================================================= */
.about-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;
}
@media(max-width:920px){.about-grid{grid-template-columns:1fr;}}
.about-image{
  border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--shadow);
}
.about-image img{width:100%;height:100%;object-fit:cover;}
.about-text h2{
  font-size:clamp(32px,4.5vw,48px);font-weight:800;
  line-height:1.25;margin-bottom:30px;letter-spacing:-.02em;
}
.about-text h2 .acc{color:var(--accent);}
.about-text p{
  font-size:15.5px;line-height:1.95;color:var(--muted);
  margin-bottom:18px;
}

/* =========================================================
   会社情報テーブル
   ========================================================= */
.info-table{
  width:100%;border-collapse:collapse;margin-top:48px;
}
.info-table th,
.info-table td{
  padding:22px 0;text-align:left;vertical-align:top;
  border-bottom:1px solid var(--line);
}
.info-table th{
  width:200px;font-weight:600;color:var(--accent);
  font-size:13px;letter-spacing:.18em;
}
.info-table td{font-size:15px;color:var(--fg-soft);line-height:1.85;}

/* =========================================================
   実績（守秘配慮で領域表記）
   ========================================================= */
.work-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px;
}
@media(max-width:780px){.work-grid{grid-template-columns:1fr;}}
.work-item{
  background:var(--bg-card);padding:42px 32px;
  border-radius:var(--r-md);border:1px solid var(--line);
  transition:border-color .3s var(--ease),transform .3s var(--ease);
}
.work-item:hover{border-color:var(--accent);transform:translateY(-4px);}
.work-item .tag{
  display:inline-block;font-size:11px;letter-spacing:.28em;font-weight:700;
  color:var(--accent);margin-bottom:18px;
}
.work-item h3{font-size:20px;margin-bottom:14px;font-weight:800;}
.work-item p{font-size:14px;color:var(--muted);line-height:1.85;}

/* =========================================================
   採用カード
   ========================================================= */
.recruit-empty{
  background:var(--bg-card);padding:80px 60px;
  border-radius:var(--r-md);border:1px solid var(--line);
  text-align:center;
}
.recruit-empty h3{font-size:26px;margin-bottom:18px;font-weight:800;}
.recruit-empty p{color:var(--muted);font-size:15px;max-width:560px;margin:0 auto 30px;line-height:1.95;}

/* =========================================================
   問い合わせフォーム
   ========================================================= */
.contact-grid{
  display:grid;grid-template-columns:.85fr 1.15fr;gap:60px;align-items:start;
}
@media(max-width:920px){.contact-grid{grid-template-columns:1fr;gap:30px;}}
.contact-lead p{font-size:15px;color:var(--muted);line-height:1.95;margin-bottom:18px;}
.contact-lead .cl-title{font-size:26px;font-weight:800;color:var(--fg);margin-bottom:22px;line-height:1.4;}

.form{
  background:var(--bg-card);
  border:1px solid var(--line);
  padding:42px 38px;border-radius:var(--r-md);
}
.field{margin-bottom:22px;}
.field label{
  display:block;font-size:13px;letter-spacing:.1em;font-weight:600;
  color:var(--fg-soft);margin-bottom:10px;
}
.field .req{
  display:inline-block;font-size:10px;color:var(--accent);
  margin-left:8px;letter-spacing:.18em;font-weight:700;
}
.field input,
.field select,
.field textarea{
  width:100%;background:var(--bg-2);
  border:1px solid var(--line-2);color:var(--fg);
  padding:14px 16px;border-radius:var(--r-sm);
  font-family:inherit;font-size:15px;
  transition:border-color .2s var(--ease);
}
.field input:focus,
.field select:focus,
.field textarea:focus{outline:none;border-color:var(--accent);}
.field textarea{resize:vertical;min-height:120px;}
.form-submit{
  width:100%;background:var(--accent);color:var(--bg);
  font-weight:700;font-size:15px;letter-spacing:.06em;
  padding:18px;border:none;border-radius:var(--r-sm);cursor:pointer;
  transition:background .2s var(--ease),transform .2s var(--ease);
  margin-top:8px;
}
.form-submit:hover{background:var(--accent-3);transform:translateY(-2px);}
.form-submit:disabled{opacity:.6;cursor:wait;}
.form-note{font-size:12px;color:var(--muted);margin-top:14px;line-height:1.7;}
.form-msg{
  display:none;margin-top:18px;padding:16px;border-radius:var(--r-sm);
  background:rgba(125,143,255,.12);border:1px solid var(--accent);
  font-size:14px;color:var(--fg);
}
.field-error{margin-top:6px;font-size:12.5px;color:#e07a73;line-height:1.5;}

/* =========================================================
   CTA エリア
   ========================================================= */
.cta-block{
  background:var(--bg-card);border-radius:var(--r-lg);
  padding:80px 60px;text-align:center;
  position:relative;overflow:hidden;border:1px solid var(--line);
}
.cta-block::before{
  content:"";position:absolute;left:50%;top:0;width:300px;height:300px;
  background:radial-gradient(circle,var(--accent) 0%,transparent 60%);
  transform:translate(-50%,-50%);opacity:.18;filter:blur(40px);
}
.cta-block .container-narrow{position:relative;z-index:1;max-width:680px;margin:0 auto;}
.cta-block h2{
  font-size:clamp(30px,4.5vw,46px);font-weight:800;
  line-height:1.3;margin-bottom:22px;letter-spacing:-.02em;
}
.cta-block p{font-size:15.5px;color:var(--muted);margin-bottom:38px;line-height:1.9;}

/* =========================================================
   フッター
   ========================================================= */
.site-footer{
  padding:80px 6vw 36px;border-top:1px solid var(--line);
  background:var(--bg-2);
}
.foot-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;
  max-width:1240px;margin:0 auto;
}
@media(max-width:780px){.foot-grid{grid-template-columns:1fr 1fr;gap:30px;}}
.foot-brand .f-logo{
  font-weight:900;font-size:20px;letter-spacing:.28em;margin-bottom:16px;
  display:inline-flex;align-items:center;gap:10px;
}
.foot-brand .f-logo .logo-mark{
  width:22px;height:22px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,var(--accent) 0%,var(--accent-2) 70%);
}
.foot-brand p{font-size:13px;color:var(--muted);line-height:1.8;max-width:340px;}
.foot-col h4{
  font-size:11px;letter-spacing:.28em;color:var(--accent);font-weight:700;
  margin-bottom:18px;
}
.foot-col ul{list-style:none;}
.foot-col li{margin-bottom:10px;}
.foot-col a{
  color:var(--muted);font-size:13.5px;
  transition:color .2s var(--ease);
}
.foot-col a:hover{color:var(--fg);}
.foot-base{
  max-width:1240px;margin:60px auto 0;padding-top:24px;
  border-top:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:center;
  font-size:11.5px;color:var(--muted);letter-spacing:.1em;
}
@media(max-width:780px){.foot-base{flex-direction:column;gap:14px;text-align:center;}}

/* =========================================================
   reveal アニメ（IntersectionObserver で is-visible 付与）
   ========================================================= */
.reveal{
  opacity:0;transform:translateY(30px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);
}
.reveal.is-visible{opacity:1;transform:translateY(0);}
.reveal-stagger > *{
  opacity:0;transform:translateY(28px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
}
.reveal-stagger.is-visible > *{opacity:1;transform:translateY(0);}
.reveal-stagger.is-visible > *:nth-child(1){transition-delay:.05s;}
.reveal-stagger.is-visible > *:nth-child(2){transition-delay:.15s;}
.reveal-stagger.is-visible > *:nth-child(3){transition-delay:.25s;}
.reveal-stagger.is-visible > *:nth-child(4){transition-delay:.35s;}
.reveal-stagger.is-visible > *:nth-child(5){transition-delay:.45s;}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms !important;transition-duration:0.01ms !important;}
  .reveal,.reveal-stagger > *{opacity:1 !important;transform:none !important;}
  .curtain{display:none;}
}