/*
 * OpsAI 共通CSS
 * html/ 配下の全ページで共有するデザイントークン・リセット・共通コンポーネント。
 * ページ固有のスタイルはこのファイルに追加せず、各HTMLの <style> に記述する。
 * 詳細: docs/html_guidelines.md
 */
:root{
  --navy-900:#0b1220;
  --navy-800:#111a2e;
  --navy-700:#182644;
  --blue-500:#3b82f6;
  --blue-400:#60a5fa;
  --teal-400:#2dd4bf;
  --ink-900:#0f172a;
  --ink-700:#334155;
  --ink-500:#64748b;
  --line:#e2e8f0;
  --bg:#f8fafc;
  --card:#ffffff;
  --radius:14px;
  --shadow:0 10px 30px -12px rgba(15,23,42,0.15);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Hiragino Sans","Yu Gothic UI","Segoe UI",system-ui,-apple-system,sans-serif;
  color:var(--ink-900);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
img,svg{display:block;}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}

/* Header */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(11,18,32,0.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 24px;max-width:1120px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;letter-spacing:.02em;}
.brand-mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--blue-500),var(--teal-400));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:15px;
  box-shadow:0 4px 14px rgba(59,130,246,0.4);
}
.brand small{display:block;font-size:11px;font-weight:400;color:#94a3b8;letter-spacing:.03em;}
nav.links{display:flex;gap:28px;}
nav.links a{color:#cbd5e1;font-size:14px;font-weight:500;transition:color .2s;}
nav.links a:hover{color:#fff;}
.nav-cta{
  background:linear-gradient(135deg,var(--blue-500),var(--teal-400));
  color:#fff;padding:9px 18px;border-radius:999px;font-size:14px;font-weight:600;
  box-shadow:0 4px 14px rgba(59,130,246,0.35);
}
@media (max-width:820px){ nav.links{display:none;} }

/* Hero */
.hero{
  position:relative;
  background:radial-gradient(1200px 500px at 15% -10%, rgba(59,130,246,0.35), transparent 60%),
             radial-gradient(900px 500px at 100% 0%, rgba(45,212,191,0.25), transparent 55%),
             linear-gradient(180deg,var(--navy-900),var(--navy-800) 70%, var(--navy-800));
  color:#fff;
  padding:96px 0 120px;
  overflow:hidden;
}
.hero::after{
  content:"";position:absolute;inset:auto 0 0 0;height:120px;
  background:linear-gradient(180deg,transparent,var(--bg));
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(96,165,250,0.12);border:1px solid rgba(96,165,250,0.35);
  color:var(--blue-400);font-size:13px;font-weight:600;letter-spacing:.03em;
  padding:6px 14px;border-radius:999px;margin-bottom:24px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--teal-400);}
.hero h1{
  font-size:clamp(32px,5vw,52px);
  font-weight:800;line-height:1.35;letter-spacing:-.01em;
  margin:0 0 20px;max-width:760px;
}
.hero h1 .accent{
  background:linear-gradient(135deg,var(--blue-400),var(--teal-400));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{
  font-size:17px;color:#cbd5e1;max-width:600px;margin:0 0 36px;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:64px;}
.btn-primary{
  background:linear-gradient(135deg,var(--blue-500),var(--teal-400));
  color:#fff;padding:14px 26px;border-radius:10px;font-weight:700;font-size:15px;
  box-shadow:0 8px 22px rgba(59,130,246,0.4);
}
.btn-secondary{
  background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.18);
  color:#e2e8f0;padding:14px 26px;border-radius:10px;font-weight:600;font-size:15px;
}
button.btn-primary, button.btn-secondary{
  border:0;cursor:pointer;font-family:inherit;appearance:none;-webkit-appearance:none;
}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:rgba(255,255,255,0.1);border-radius:16px;overflow:hidden;
  border:1px solid rgba(255,255,255,0.1);
}
.hero-stats div{background:rgba(255,255,255,0.03);padding:22px 20px;}
.hero-stats .num{font-size:26px;font-weight:800;color:#fff;}
.hero-stats .num span{font-size:14px;font-weight:600;color:var(--teal-400);}
.hero-stats .label{font-size:12.5px;color:#94a3b8;margin-top:4px;}
@media (max-width:720px){ .hero-stats{grid-template-columns:repeat(2,1fr);} }

/* Sections */
section{padding:88px 0;}
.section-head{max-width:640px;margin:0 auto 52px;text-align:center;}
.section-head .tag{
  color:var(--blue-500);font-weight:700;font-size:13px;letter-spacing:.08em;
  text-transform:uppercase;margin-bottom:12px;display:block;
}
.section-head h2{font-size:clamp(24px,3.4vw,34px);font-weight:800;margin:0 0 14px;color:var(--ink-900);}
.section-head p{color:var(--ink-500);font-size:15.5px;margin:0;}

/* Feature grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
@media (max-width:900px){ .grid{grid-template-columns:repeat(2,1fr);} }
@media (max-width:620px){ .grid{grid-template-columns:1fr;} }
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;box-shadow:0 1px 3px rgba(15,23,42,0.04);
  transition:transform .2s, box-shadow .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.icon{
  width:44px;height:44px;border-radius:11px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:18px;color:#fff;
}
.icon svg{width:22px;height:22px;}
.icon.b1{background:linear-gradient(135deg,#3b82f6,#60a5fa);}
.icon.b2{background:linear-gradient(135deg,#2dd4bf,#14b8a6);}
.icon.b3{background:linear-gradient(135deg,#8b5cf6,#a78bfa);}
.icon.b4{background:linear-gradient(135deg,#f59e0b,#fbbf24);}
.icon.b5{background:linear-gradient(135deg,#ef4444,#f87171);}
.icon.b6{background:linear-gradient(135deg,#3b82f6,#2dd4bf);}
.card h3{font-size:17px;font-weight:700;margin:0 0 10px;color:var(--ink-900);}
.card p{font-size:14.5px;color:var(--ink-500);margin:0;}

/* Workflow */
.workflow{background:var(--navy-900);color:#fff;}
.workflow .section-head h2, .workflow .section-head p{color:#fff;}
.workflow .section-head p{color:#94a3b8;}
.steps{
  display:grid;grid-template-columns:repeat(5,1fr);gap:16px;counter-reset:step;
}
@media (max-width:960px){ .steps{grid-template-columns:repeat(2,1fr);} }
@media (max-width:560px){ .steps{grid-template-columns:1fr;} }
.step{
  background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.1);
  border-radius:12px;padding:22px 18px;position:relative;
}
.step .num{
  counter-increment:step;
  width:30px;height:30px;border-radius:50%;
  background:linear-gradient(135deg,var(--blue-500),var(--teal-400));
  color:#fff;font-size:13px;font-weight:800;
  display:flex;align-items:center;justify-content:center;margin-bottom:14px;
}
.step .num::before{content:counter(step);}
.step h4{font-size:14.5px;font-weight:700;margin:0 0 8px;color:#fff;}
.step p{font-size:13px;color:#94a3b8;margin:0;}

/* Tech stack */
.stack-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.chip{
  display:flex;align-items:center;gap:8px;
  background:var(--card);border:1px solid var(--line);
  padding:10px 18px;border-radius:999px;font-size:13.5px;font-weight:600;color:var(--ink-700);
  box-shadow:0 1px 2px rgba(15,23,42,0.03);
}
.chip .dot{width:8px;height:8px;border-radius:50%;}
.chip .dot.o1{background:#f59e0b;}
.chip .dot.o2{background:#3b82f6;}
.chip .dot.o3{background:#10b981;}
.chip .dot.o4{background:#8b5cf6;}
.chip .dot.o5{background:#ef4444;}

/* KPI band */
.kpi-band{
  background:linear-gradient(135deg,var(--navy-800),var(--navy-700));
  border-radius:20px;padding:52px 40px;color:#fff;
  display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;
}
@media (max-width:820px){ .kpi-band{grid-template-columns:1fr;padding:36px 26px;} }
.kpi-band h3{font-size:24px;font-weight:800;margin:0 0 12px;}
.kpi-band p{color:#cbd5e1;font-size:14.5px;margin:0;}
.kpi-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.kpi-item{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:12px;padding:18px;}
.kpi-item .v{font-size:22px;font-weight:800;background:linear-gradient(135deg,var(--blue-400),var(--teal-400));-webkit-background-clip:text;background-clip:text;color:transparent;}
.kpi-item .l{font-size:12.5px;color:#94a3b8;margin-top:4px;}

/* CTA */
.cta{
  text-align:center;background:var(--bg);
}
.cta-box{
  background:linear-gradient(135deg,#eff6ff,#f0fdfa);
  border:1px solid var(--line);border-radius:20px;
  padding:64px 32px;
}
.cta-box h2{font-size:clamp(22px,3vw,30px);font-weight:800;margin:0 0 14px;}
.cta-box p{color:var(--ink-500);margin:0 0 30px;font-size:15px;}
.btn-primary.dark{color:#fff;}

footer{
  background:var(--navy-900);color:#94a3b8;padding:40px 0;
  font-size:13px;
}
.footer-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;}
footer .brand{color:#fff;}

/* Form fields (login, contact, settings 等の入力系ページ共通) */
.field{margin-bottom:18px;}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-700);margin-bottom:6px;}
.field input{
  width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;
  font-size:14px;font-family:inherit;color:var(--ink-900);background:#fff;
  transition:border-color .15s, box-shadow .15s;
}
.field input::placeholder{color:#94a3b8;}
.field input:focus{
  outline:none;border-color:var(--blue-500);box-shadow:0 0 0 3px rgba(59,130,246,0.15);
}
.field-input-group{position:relative;display:flex;align-items:center;}
.field-input-group input{padding-right:64px;}
.field-toggle{
  position:absolute;right:10px;background:none;border:0;cursor:pointer;
  color:var(--blue-500);font-size:12.5px;font-weight:600;padding:4px 6px;font-family:inherit;
}
.checkbox-row{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-700);cursor:pointer;}
.checkbox-row input[type="checkbox"]{width:16px;height:16px;accent-color:var(--blue-500);}
.form-error{
  background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;
  font-size:13px;padding:10px 14px;border-radius:10px;margin-bottom:18px;
}

/* Auth layout（ログイン・パスワード再設定等の認証系ページ共通） */
.auth-shell{
  min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(1200px 500px at 15% -10%, rgba(59,130,246,0.35), transparent 60%),
             radial-gradient(900px 500px at 100% 0%, rgba(45,212,191,0.25), transparent 55%),
             linear-gradient(180deg,var(--navy-900),var(--navy-800) 70%, var(--navy-800));
}
.auth-card{
  width:100%;max-width:420px;background:var(--card);border-radius:20px;
  padding:40px 36px;box-shadow:0 20px 50px -20px rgba(0,0,0,0.5);
}
.auth-brand{display:flex;align-items:center;gap:12px;margin-bottom:28px;}
.auth-brand-name{font-weight:700;font-size:16px;color:var(--ink-900);}
.auth-brand-sub{font-size:11.5px;color:var(--ink-500);letter-spacing:.02em;}
.auth-title{font-size:22px;font-weight:800;margin:0 0 8px;color:var(--ink-900);}
.auth-lead{font-size:14px;color:var(--ink-500);margin:0 0 28px;}
.auth-row{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;
  gap:10px;margin:4px 0 24px;
}
.auth-link{font-size:13px;color:var(--blue-500);font-weight:600;}
.auth-link:hover{text-decoration:underline;}
.auth-submit{width:100%;text-align:center;}
.auth-foot{text-align:center;font-size:13px;color:var(--ink-500);margin-top:24px;}