:root{
  --bg:#08080a; --panel:#131316; --panel2:#1a1a1f; --line:#2a2a31;
  --fg:#f1efe9; --sub:#a6a39b; --orange:#ff7a1a; --orange2:#ffb347; --glow:rgba(255,122,26,.55);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",system-ui,sans-serif;line-height:1.9;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.012) 0 1px,transparent 1px 3px),radial-gradient(1200px 600px at 50% -10%,rgba(255,122,26,.10),transparent 60%)}
a{color:var(--orange2)}
.wrap{position:relative;z-index:1;max-width:1040px;margin:0 auto;padding:0 20px}
section{padding:88px 0}
.metal{background:linear-gradient(180deg,#fff 0%,#d9d6cf 38%,#8d8a83 52%,#e9e6df 70%,#a9a69f 100%);-webkit-background-clip:text;background-clip:text;color:transparent}

/* 上の帯 */
.top{position:sticky;top:0;z-index:10;background:rgba(8,8,10,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{font-weight:800;font-style:italic;letter-spacing:.02em;font-size:18px;color:var(--fg);text-decoration:none}
.logo b{color:var(--orange)}

/* ボタン */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.6em;font-weight:800;text-decoration:none;color:#140a02;
  background:linear-gradient(180deg,var(--orange2),var(--orange));padding:16px 34px;font-size:17px;border:0;cursor:pointer;
  clip-path:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px);
  box-shadow:0 0 28px var(--glow);transition:transform .15s,filter .15s}
.btn:hover{transform:translateY(-2px);filter:brightness(1.1)}
.btn.small{padding:9px 18px;font-size:14px}
.btn.off{background:#2a2a31;color:var(--sub);box-shadow:none;cursor:default}
.btn.off:hover{transform:none;filter:none}
.filter-glow{filter:drop-shadow(0 0 18px var(--glow))}

/* 最初の画面 */
.hero{padding:0;position:relative}
.hero img{display:block;width:100%;height:auto;max-height:78vh;object-fit:cover}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:42%;background:linear-gradient(180deg,transparent,var(--bg))}
.lead{position:relative;z-index:2;text-align:center;margin-top:-64px;padding-bottom:72px}
.lead h1{font-size:clamp(28px,5.2vw,54px);line-height:1.35;font-weight:800;letter-spacing:.01em}
.lead h1 em{font-style:normal;color:var(--orange);text-shadow:0 0 24px var(--glow)}
.lead p{color:var(--sub);margin:22px auto 34px;max-width:640px;font-size:17px}
.note{display:block;margin-top:14px;color:var(--sub);font-size:13px}

/* 見出し */
.kicker{display:flex;align-items:center;gap:12px;color:var(--orange);font-weight:800;font-size:13px;letter-spacing:.24em;margin-bottom:14px}
.kicker::before{content:"";width:34px;height:10px;background:repeating-linear-gradient(115deg,var(--orange) 0 4px,transparent 4px 8px)}
h2{font-size:clamp(24px,3.6vw,38px);line-height:1.45;font-weight:800;margin-bottom:40px}

/* 枠（四隅に印） */
.frame{position:relative;background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--line);padding:28px 26px}
.frame::before,.frame::after{content:"";position:absolute;width:18px;height:18px;border:2px solid var(--orange);filter:drop-shadow(0 0 6px var(--glow))}
.frame::before{left:-1px;top:-1px;border-right:0;border-bottom:0}
.frame::after{right:-1px;bottom:-1px;border-left:0;border-top:0}
.grid{display:grid;gap:18px;grid-template-columns:repeat(3,1fr)}
.frame h3{font-size:19px;line-height:1.5;margin-bottom:8px}
.frame p{color:var(--sub);font-size:15px;line-height:1.8}
.num{font-style:italic;font-weight:800;font-size:15px;color:var(--orange);letter-spacing:.1em;display:block;margin-bottom:10px}

/* 流れ */
.steps{display:grid;gap:18px;grid-template-columns:repeat(3,1fr);counter-reset:s}
.steps .frame{counter-increment:s}
.steps .frame .num::after{content:" 0" counter(s)}
.say{display:inline-block;margin-top:12px;padding:6px 14px;border:1px solid var(--orange);color:var(--orange2);font-weight:800;font-size:15px}

/* 表 */
.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:15px}
.table th{white-space:nowrap;color:var(--orange2);font-weight:800;width:11em}
.table td{color:var(--fg)}
.table td small{color:var(--sub);display:block}

/* よくある質問 */
details{border-bottom:1px solid var(--line);padding:18px 4px}
summary{cursor:pointer;font-weight:800;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::after{content:"+";color:var(--orange);font-size:22px;line-height:1}
details[open] summary::after{content:"−"}
details p{color:var(--sub);margin-top:10px;font-size:15px}

/* 最後 */
.cta{text-align:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:radial-gradient(700px 260px at 50% 100%,rgba(255,122,26,.16),transparent 70%)}
.cta h2{margin-bottom:18px}
.cta p{color:var(--sub);margin-bottom:30px}
footer{padding:40px 0 60px;color:var(--sub);font-size:13px;text-align:center}
footer a{color:var(--sub)}

@media (max-width:820px){
  section{padding:64px 0}
  .grid,.steps{grid-template-columns:1fr}
  .lead{margin-top:-28px}
  .table th{width:auto;white-space:normal;display:block;border-bottom:0;padding-bottom:0}
  .table td{display:block;padding-top:6px}
  .top .btn{display:none}
}
.nb{display:inline-block}