:root{
  --navy:#0b2545;--navy-2:#13315c;--red:#d7263d;--ink:#1c2430;--muted:#5b6675;
  --bg:#fff;--bg-alt:#f4f7fb;--line:#e1e7ef;--radius:14px;
  --sans:"Noto Sans JP",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Noto Serif JP","Noto Sans JP",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.8;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:inherit}
.container{width:min(1120px,100% - 32px);margin-inline:auto}
.narrow{width:min(760px,100% - 32px)}
.center{text-align:center;color:var(--muted)}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
.logo{font-weight:700;font-size:1.25rem;text-decoration:none;color:var(--navy);letter-spacing:.04em}
.logo span{color:var(--red);margin-left:.4em;font-weight:500;font-size:.85em}
.nav{display:flex;align-items:center;gap:22px;font-size:.9rem}
.nav a{text-decoration:none;color:var(--ink);white-space:nowrap}
.nav a:not(.btn):hover{color:var(--red)}
.header-tools{display:flex;align-items:center;gap:10px}
.lang{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.lang button{border:0;background:none;padding:6px 12px;font:inherit;font-size:.8rem;font-weight:700;color:var(--muted);cursor:pointer}
.lang button.active{background:var(--navy);color:#fff}
.menu-btn{display:none;width:40px;height:40px;border:0;background:none;cursor:pointer;padding:9px}
.menu-btn span{display:block;height:2px;background:var(--navy);margin:6px 0;transition:.2s}

/* buttons */
.btn{display:inline-block;background:var(--red);color:#fff!important;padding:14px 30px;border-radius:999px;font:inherit;font-weight:700;text-decoration:none;border:2px solid var(--red);cursor:pointer;transition:.2s}
.btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-sm{padding:8px 18px;font-size:.85rem}
.btn-ghost{background:transparent;border-color:#fff;color:#fff!important}

/* hero */
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 60%,#1d4e89 100%);color:#fff;padding:96px 0 72px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(215,38,61,.35),transparent 70%)}
.hero-inner{position:relative;z-index:1}
.eyebrow{margin:0 0 10px;font-size:.78rem;font-weight:700;letter-spacing:.2em;color:var(--red)}
.hero .eyebrow{color:#ff8b99}
.hero h1{font-family:var(--serif);font-size:clamp(2rem,5.2vw,3.4rem);line-height:1.35;margin:0 0 20px}
.lead{max-width:640px;font-size:1.05rem;opacity:.92;margin:0 0 32px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:56px}
.hero-stats{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:640px}
.hero-stats li{border-top:1px solid rgba(255,255,255,.3);padding-top:12px}
.hero-stats strong{display:block;font-size:1.9rem;line-height:1.2}
.hero-stats span{font-size:.8rem;opacity:.85}

/* sections */
.section{padding:88px 0}
.section-alt{background:var(--bg-alt)}
.section-dark{background:var(--navy);color:#fff}
.section h2{font-family:var(--serif);font-size:clamp(1.6rem,3.4vw,2.2rem);margin:0 0 40px;color:var(--navy)}
.section-dark h2{color:#fff}
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:0 2px 12px rgba(11,37,69,.04);transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 28px rgba(11,37,69,.1)}
.card h3{margin:6px 0 10px;font-size:1.1rem;color:var(--navy)}
.card p{margin:0;color:var(--muted);font-size:.93rem}
.num{font-family:var(--serif);font-size:2rem;font-weight:700;color:var(--red);opacity:.85}
.icon{font-size:2rem;line-height:1}

/* steps */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:18px;counter-reset:s}
.steps li{position:relative;padding:22px 18px;border-radius:var(--radius);background:var(--bg-alt)}
.steps b{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;margin-bottom:10px}
.steps h3{margin:0 0 6px;font-size:1rem;color:var(--navy)}
.steps p{margin:0;font-size:.85rem;color:var(--muted)}

/* why */
.fact{border-top:2px solid var(--red);padding-top:16px}
.fact strong{font-family:var(--serif);font-size:2.2rem}
.fact p{margin:6px 0 0;font-size:.92rem;opacity:.88}
.note{margin-top:28px;font-size:.8rem;opacity:.7}

/* company */
.company{margin:0;border-top:1px solid var(--line)}
.company div{display:grid;grid-template-columns:180px 1fr;gap:16px;padding:18px 4px;border-bottom:1px solid var(--line)}
.company dt{font-weight:700;color:var(--navy)}
.company dd{margin:0}

/* faq */
details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;padding:0 22px}
summary{cursor:pointer;font-weight:700;padding:18px 0;color:var(--navy);list-style:none;position:relative;padding-right:28px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font-size:1.4rem;color:var(--red)}
details[open] summary::after{content:"−"}
details p{margin:0 0 18px;color:var(--muted)}

/* form */
.form{display:grid;gap:18px;margin-top:32px}
.form label{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px;font-weight:700;font-size:.9rem;color:var(--navy)}
.form em{font-style:normal;color:var(--red);font-size:.72rem}
.form input,.form select,.form textarea{flex:1 1 100%}
.form input,.form select,.form textarea{font:inherit;font-weight:400;padding:12px 14px;border:1px solid #c9d3e0;border-radius:10px;background:#fff;width:100%}
.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--navy-2);outline-offset:1px}
.form .btn{justify-self:center;min-width:220px}
.form-msg{text-align:center;margin:0;min-height:1.5em;font-size:.9rem;color:var(--muted)}
.form-msg.err{color:var(--red)}

/* footer */
.site-footer{background:#07182e;color:#cdd6e3;padding:32px 0}
.site-footer .logo{color:#fff}
.footer-inner{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center}

/* responsive */
@media(max-width:960px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .menu-btn{display:block}
  .nav{position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px 16px 16px;display:none}
  .nav.open{display:flex}
  .nav a{padding:12px 4px;border-bottom:1px solid var(--line)}
  .nav .btn{margin-top:12px;text-align:center;border-bottom:2px solid var(--red)}
}
@media(max-width:600px){
  .section{padding:64px 0}
  .hero{padding:64px 0 48px}
  .grid-3,.grid-4,.steps{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr 1fr}
  .company div{grid-template-columns:1fr;gap:4px}
  .logo span{display:none}
}