:root{
  --navy:#0f1b2e; --navy2:#16263d; --panel:#1d3150; --line:#2f4668;
  --paper:#f5f1ea; --paper2:#ebe5da; --ink:#17202e; --muted:#5d6675; --muted-d:#a9b4c4;
  --gold:#b8975a; --gold-l:#d8bd86; --line-green:#06c755;
  --serif:"Noto Serif JP","Hiragino Mincho ProN","Yu Mincho",serif;
  --sans:"Noto Sans JP","Hiragino Sans","Yu Gothic",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:#080f1b;color:var(--ink);font-family:var(--sans);line-height:1.85;font-size:16px}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
main,.footer,.topbar{max-width:560px;margin:0 auto}
main{background:var(--paper);overflow:hidden}

.topbar{background:var(--navy);color:var(--gold-l);text-align:center;font-size:12px;font-weight:700;padding:7px 12px;letter-spacing:.12em;border-bottom:1px solid var(--line)}

/* buttons */
.btn{display:flex;align-items:center;justify-content:center;min-height:56px;padding:0 24px;border-radius:6px;font-weight:700;font-size:16px;text-decoration:none;text-align:center;letter-spacing:.06em}
.btn--line{background:var(--line-green);color:#fff;box-shadow:0 6px 18px rgba(6,199,85,.28)}
.btn--line:active{transform:translateY(1px)}
.btn--lg{min-height:64px;font-size:18px}
.btn:focus-visible,summary:focus-visible{outline:3px solid var(--navy);outline-offset:3px}
.dark .btn:focus-visible,.hero .btn:focus-visible,.final .btn:focus-visible{outline-color:#fff}

/* hero */
.hero{background:var(--navy);color:#fff}
.hero__media{position:relative;height:56svh;min-height:360px;max-height:540px;overflow:hidden;background:#000}
.hero__media picture,.hero__media img{position:absolute;inset:0;width:100%;height:100%}
.hero__media img{object-fit:cover;object-position:50% 22%}
.hero__media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,27,46,.1) 0%,rgba(15,27,46,0) 35%,rgba(15,27,46,.7) 78%,var(--navy) 100%)}
.hero__body{position:relative;z-index:1;padding:0 22px 32px;margin-top:-84px}
.eyebrow{font-size:11px;letter-spacing:.26em;color:var(--gold);margin-bottom:8px;font-weight:700}
.hero .eyebrow,.dark .eyebrow{color:var(--gold-l)}
h1{font-family:var(--serif);font-size:clamp(27px,8vw,36px);line-height:1.5;font-weight:700;margin-bottom:14px}
h1 em{font-style:normal;color:var(--gold-l)}
.hero__sub{font-size:14px;color:#dbe2ec;margin-bottom:16px}
.facts{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin-bottom:20px}
.facts li{border:1px solid var(--gold);color:var(--gold-l);padding:3px 12px;border-radius:999px;font-size:13px;font-weight:500}
.note{font-size:12px;color:var(--muted-d);text-align:center;margin-top:10px;line-height:1.7}

/* sections */
.sec{padding:60px 22px;border-top:1px solid var(--paper2)}
.dark{background:var(--navy);color:#fff;border-top:0}
h2{font-family:var(--serif);font-size:clamp(22px,6.4vw,28px);line-height:1.55;margin-bottom:20px;font-weight:700}
h3{font-size:16px;line-height:1.5}
.lead{color:var(--muted);margin:0 0 22px;font-size:15px}
.dark .lead{color:var(--muted-d)}
.small{font-size:12px;color:var(--muted);margin:10px 0 0}
.dark .small{color:var(--muted-d)}

.duo{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 -8px 12px}
.duo img{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:4px}
.wide{margin:0 -22px 8px}
.wide img{width:100%;aspect-ratio:4/3;object-fit:cover}
.lining{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 -8px}
.lining img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:4px}

/* lists */
.point-list,.reason-list,.steps{list-style:none;display:grid;gap:12px}
.point-list li,.reason-list li,.steps li{display:flex;gap:16px;align-items:flex-start;border-radius:8px;padding:18px}
.point-list li,.steps li{background:var(--navy2);border:1px solid var(--line)}
.reason-list li{background:#fff;border:1px solid var(--paper2)}
.num{font-family:var(--serif);font-size:26px;line-height:1;color:var(--gold);min-width:40px}
.dark .num{color:var(--gold-l)}
.point-list p,.steps p{font-size:14px;color:var(--muted-d);margin-top:4px}
.reason-list p{font-size:14px;color:var(--muted);margin-top:4px}
.tech .duo{margin-bottom:20px}

.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0 0 20px}
.chips li{border:1px solid var(--gold);color:var(--gold-l);padding:6px 14px;border-radius:999px;font-size:14px}
.chips--navy{margin-top:8px}
.chips--navy li{border-color:var(--navy);color:var(--navy);background:transparent;font-weight:500}

/* faq */
details{border-bottom:1px solid var(--paper2)}
summary{list-style:none;cursor:pointer;min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-weight:500;padding:8px 0}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--gold);font-size:22px}
details[open] summary::after{content:"–"}
details p{color:var(--muted);font-size:14px;padding:0 0 16px}

/* final */
.final{position:relative;min-height:540px;display:flex;align-items:flex-end;background:var(--navy);color:#fff}
.final picture,.final img{position:absolute;inset:0;width:100%;height:100%}
.final img{object-fit:cover;object-position:50% 25%}
.final::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,27,46,.15),rgba(15,27,46,.92) 68%,var(--navy))}
.final__body{position:relative;z-index:1;padding:0 22px 44px;width:100%;text-align:center}
.final h2{margin-bottom:18px}
.final .small{color:var(--muted-d);margin-top:12px}

/* footer */
.footer{background:#080f1b;color:var(--muted-d);padding:36px 22px 120px;font-size:12px}
.footer__brand{font-family:var(--serif);font-size:18px;color:#fff;margin-bottom:12px;letter-spacing:.12em}
.footer dl{display:grid;grid-template-columns:4.5em 1fr;gap:6px 8px;margin-bottom:16px}
.footer dt{color:var(--gold-l)}
.footer a{text-decoration:underline}
.legal{margin-top:6px;line-height:1.7}

/* fixed CTA */
.cta-bar{position:fixed;left:0;right:0;bottom:0;z-index:50;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(15,27,46,0),rgba(15,27,46,.94) 40%);transition:transform .25s,opacity .25s}
.cta-bar .btn{max-width:520px;margin:0 auto}
.cta-bar.is-hidden{transform:translateY(120%);opacity:0;pointer-events:none}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.cta-bar{transition:none}}