:root{
  --case:#33363c; --case-hi:#4b4f58; --case-lo:#1b1d21;
  --panel:#b3b8c0; --window:#101216;
  --ivory:#e9e3d3; --ivory-lo:#c9c2ae;
  --amber:#ff9b21; --red:#ff3b30; --green:#35d07f;
  --txt:#d3d8de; --dim:#8d939c; --line:#3c4047;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);color:var(--txt);
  background:radial-gradient(120% 70% at 50% 0%,#34373d 0%,#1a1c20 55%,#0d0e11 100%);
  background-attachment:fixed;
  line-height:1.85;-webkit-text-size-adjust:100%;
}
.wrap{max-width:640px;margin:0 auto;padding:0 16px}
section{padding:44px 0}
a{color:var(--amber)}

/* 見出し ───────────────── */
.eyebrow{
  font:700 9.5px/1 var(--mono);letter-spacing:.24em;color:var(--dim);
  display:flex;align-items:center;gap:9px;margin:0 0 14px;
}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--line)}
h2{font-size:19px;font-weight:800;letter-spacing:.02em;margin:0 0 18px;color:#eceff3}
h3{font-size:14.5px;font-weight:800;margin:0 0 6px;color:#eceff3}
p{margin:0 0 14px;font-size:14px}
.lede{font-size:15px;color:#c2c8d0}

/* HERO ──────────────────── */
.hero{padding:26px 0 34px;text-align:center}
.plate{
  display:inline-flex;align-items:center;gap:10px;
  padding:7px 15px 7px 12px;border-radius:7px;
  background:linear-gradient(170deg,var(--case-hi),#2a2d33);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2),0 6px 18px rgba(0,0,0,.5);
  font:800 11px/1 var(--sans);letter-spacing:.3em;color:#dfe3e8;
}
.plate small{font:600 9px/1 var(--mono);letter-spacing:.16em;color:#7e848d}
.led{width:8px;height:8px;border-radius:50%;background:var(--red);
  box-shadow:0 0 9px 2px rgba(255,59,48,.55);animation:blink 2.6s infinite}
@keyframes blink{0%,88%{opacity:1}94%{opacity:.25}100%{opacity:1}}

h1{font-size:clamp(20px,6.8vw,40px);line-height:1.28;font-weight:800;
  letter-spacing:-.01em;margin:22px 0 14px;color:#f2f4f7;white-space:nowrap}
h1 em{font-style:normal;color:var(--amber);
  text-shadow:0 0 26px rgba(255,155,33,.35)}
.hero p{max-width:30em;margin:0 auto 8px;color:#b9c0c8;font-size:14.5px}
.hero .fine{font-size:12.5px;color:#8d939c;line-height:1.7}
.reels{width:186px;margin:26px auto 4px;display:block}

.cta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.btn{
  display:inline-block;text-decoration:none;border-radius:6px;
  padding:14px 22px;font:800 13px/1 var(--sans);letter-spacing:.06em;
  background:linear-gradient(#e2e5ea,#b7bcc4 62%,#9aa0a8);color:#22252a;
  box-shadow:0 4px 0 #5c616a,0 7px 14px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.85);
  transition:transform .06s,box-shadow .06s;
}
.btn:active{transform:translateY(4px);box-shadow:0 0 0 #5c616a,inset 0 2px 4px rgba(0,0,0,.3)}
.btn.ghost{background:transparent;color:var(--txt);box-shadow:inset 0 0 0 1px var(--line);padding:14px 20px}
.btn.ghost:active{transform:translateY(2px);box-shadow:inset 0 0 0 1px var(--line)}

/* スペックチップ ────────── */
.chips{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:30px}
.chip{
  border-radius:7px;padding:12px 12px 11px;
  background:linear-gradient(#2c2f35,#232629);box-shadow:inset 0 1px 0 rgba(255,255,255,.08);
  text-align:left;
}
.chip b{display:block;font:700 9px/1 var(--mono);letter-spacing:.16em;color:var(--dim);margin-bottom:6px}
.chip span{font-size:13px;font-weight:700;color:#e4e8ec}

/* カセットラベル＝ステップ ── */
.steps{display:flex;flex-direction:column;gap:14px}
.label{
  position:relative;border-radius:5px;padding:15px 16px 16px;
  background:linear-gradient(160deg,var(--ivory),var(--ivory-lo));
  color:#2c2a24;box-shadow:0 6px 16px rgba(0,0,0,.4);
}
.label::before{
  content:"";position:absolute;left:0;right:0;top:40px;height:1px;background:rgba(60,55,45,.22);
}
.label .no{
  font:700 11px/1 var(--mono);letter-spacing:.14em;color:#9a3f10;
  display:flex;align-items:baseline;gap:9px;margin-bottom:15px;
}
.label .no i{font-style:normal;font-size:9px;letter-spacing:.2em;color:#8b8574}
.label h3{color:#221f19;font-size:16px;margin:0 0 7px}
.label p{color:#4e4a40;font-size:13.5px;margin:0}
.label p + p{margin-top:9px}
.label code{
  font:700 12px/1 var(--mono);background:rgba(44,42,36,.1);
  padding:2px 6px;border-radius:3px;color:#2c2a24;white-space:nowrap;
}

/* 表 ────────────────────── */
.keys{border-radius:8px;overflow:hidden;box-shadow:inset 0 0 0 1px var(--line)}
.row{display:grid;grid-template-columns:88px 1fr;gap:12px;padding:12px 14px;align-items:baseline}
.row + .row{border-top:1px solid var(--line)}
.row:nth-child(odd){background:rgba(255,255,255,.018)}
.row dt{font:700 12px/1.5 var(--mono);letter-spacing:.05em;color:#e4e8ec}
.row dd{margin:0;font-size:13px;color:var(--dim)}
.row dt .k{color:var(--amber)}
dl{margin:0}

/* ティップス ─────────────── */
.tips{display:flex;flex-direction:column;gap:2px}
.tip{padding:15px 0;border-top:1px solid var(--line)}
.tip:last-child{border-bottom:1px solid var(--line)}
.tip h3{display:flex;gap:9px;align-items:baseline}
.tip h3 b{font:700 10px/1 var(--mono);color:var(--amber);letter-spacing:.1em;flex:none}
.tip p{margin:0;font-size:13.5px;color:var(--dim)}

/* FAQ ───────────────────── */
details{border-top:1px solid var(--line);padding:0}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{
  list-style:none;cursor:pointer;padding:15px 26px 15px 0;position:relative;
  font-size:13.5px;font-weight:700;color:#e4e8ec;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:"＋";position:absolute;right:2px;top:14px;color:var(--amber);font-size:14px;font-weight:400;
}
details[open] summary::after{content:"−"}
details p{font-size:13px;color:var(--dim);padding:0 0 15px;margin:0}

/* 注記ボックス ──────────── */
.note{
  border-radius:8px;padding:14px 16px;font-size:12.5px;color:#b3bac2;
  background:rgba(255,155,33,.07);box-shadow:inset 0 0 0 1px rgba(255,155,33,.24);
}
.note b{color:var(--amber)}

/* フッター ──────────────── */
footer{padding:34px 0 calc(96px + env(safe-area-inset-bottom));text-align:center;
  border-top:1px solid var(--line);margin-top:12px}
footer p{font-size:11.5px;color:#6c727a;margin:0}
footer a{color:#8d939c;text-decoration:none}
.footer-links{margin-top:9px!important;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:4px 8px}
.footer-links .sep{color:#484d55;user-select:none}

/* 下部固定CTA ───────────── */
.dock{
  position:fixed;left:0;right:0;bottom:0;z-index:5;
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  background:linear-gradient(rgba(13,14,17,0),rgba(13,14,17,.94) 42%);
  display:flex;justify-content:center;pointer-events:none;
}
.dock .btn{pointer-events:auto;width:100%;max-width:420px;text-align:center}

@media (min-width:560px){
  .chips{grid-template-columns:repeat(4,1fr)}
  section{padding:56px 0}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}