/* unmask LP — engineering docs aesthetic. typography rich + accent dark + grid features. */

:root{
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --bg-dark: #0c1018;
  --fg: #0f172a;
  --fg-mute: #475569;
  --fg-light: #64748b;
  --line: #e2e8f0;
  --line-dark: #1f2937;
  --accent: #2563eb;
  --accent-2: #6366f1;
  --bot: #b91c1c;
  --bot-bg: #fee2e2;
  --pass: #15803d;
  --pass-bg: #dcfce7;
}

*{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{
  font-family:'Inter','Hiragino Kaku Gothic ProN','Noto Sans JP',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-feature-settings:'kern' 1,'liga' 1,'calt' 1;
  line-height:1.65;color:var(--fg);background:var(--bg);margin:0;
}

.wrap{max-width:64rem;margin:0 auto;padding:0 1.25rem}

a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

code{
  font-family:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  font-size:.88em;
  background:rgba(15,23,42,.06);
  padding:.08em .35em;
  border-radius:3px;
  color:#0f172a;
}

/* -------- Topnav -------- */
.topnav{
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(150%) blur(6px);
  position:sticky;top:0;z-index:50;
}
.topnav-row{display:flex;align-items:center;justify-content:space-between;padding:.85rem 1.25rem}
.brand{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.05rem;color:var(--fg)}
.brand:hover{text-decoration:none}
.logo-mark{
  width:1.6rem;height:1.6rem;border-radius:.35rem;
  background:url('/static/icon.png') center/cover no-repeat;
  flex-shrink:0;
}
.brand-name{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;letter-spacing:-.01em}
.nav{display:flex;gap:1.2rem;font-size:.9rem;align-items:center}
.nav a{color:var(--fg-mute);font-weight:500}
.nav a:hover{color:var(--fg);text-decoration:none}
.lang-sw{margin-left:.4rem;font-size:.78rem;color:var(--fg-mute);background:transparent;border:1px solid var(--line);border-radius:.25rem;padding:.15rem .35rem;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;cursor:pointer}
.lang-sw:hover{border-color:var(--fg)}

/* -------- Hero -------- */
.hero{
  position:relative;
  padding:2.5rem 0 2rem;
  overflow:hidden;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(99,102,241,.10), transparent 55%),
    radial-gradient(ellipse at 90% 70%, rgba(37,99,235,.08), transparent 55%),
    var(--bg);
  border-bottom:1px solid var(--line);
}
.hero-inner{max-width:46rem}
.kicker{
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--fg-light);margin:0 0 1rem;
}
.h-display{
  font-size:clamp(2rem,5vw,3.4rem);
  line-height:1.1;letter-spacing:-.02em;font-weight:700;
  margin:0 0 1.2rem;color:var(--fg);
}
.lede{
  font-size:1.1rem;color:var(--fg-mute);max-width:42rem;margin:0 0 2rem;
}
/* hero sub-tagline (= h1 直下の強い 1 行 catch).
   日本語面の "no 24365." 等の hook. */
.hero-sub{
  font-size:1.6rem;color:var(--fg);font-weight:700;
  max-width:42rem;margin:0 0 .35rem;letter-spacing:.01em;
}
/* hero-supp (= hero-sub の下に置く弱め 1 行. LP TOP 限定の補足 narrative).
   product の動機を 1 文で出す箇所. */
.hero-supp{
  font-size:.95rem;color:var(--fg-mute);font-style:italic;
  max-width:42rem;margin:0 0 1.1rem;letter-spacing:.01em;
}
.cta-row{display:flex;gap:.7rem;flex-wrap:wrap;margin-bottom:2rem}
.btn{
  display:inline-block;padding:.7rem 1.3rem;border-radius:.4rem;font-weight:600;font-size:.95rem;
  border:1px solid transparent;transition:transform .1s,background .15s,border .15s;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--fg);color:#fff;border-color:var(--fg)}
.btn-primary:hover{background:#000}
.btn-ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--fg)}
.hero-meta{display:flex;flex-wrap:wrap;gap:.4rem;margin:0;font-size:.78rem}
.tag{
  display:inline-block;
  padding:.18rem .55rem;border:1px solid var(--line);border-radius:1rem;
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  color:var(--fg-mute);background:#fff;
}

/* -------- Section -------- */
.section{padding:4.5rem 0;border-bottom:1px solid var(--line)}
/* hero 直後の section は top padding を縮める (= hero bottom と合わせて
   気持ち詰まり気味に. core features への目線連結を切らないため). */
.hero + .section{padding-top:2.5rem}
.section-alt{background:var(--bg-alt)}
.section-eyebrow{
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);margin:0 0 .5rem;font-weight:600;
}
.h-section{
  font-size:clamp(1.6rem,3vw,2.1rem);
  line-height:1.2;letter-spacing:-.015em;font-weight:700;
  margin:0 0 2.4rem;color:var(--fg);
}

/* -------- Closing CTA band (= centered get-started section before footer) -------- */
.cta-band{text-align:center}
.cta-band .h-section{margin-bottom:1.6rem}
.cta-band .cta-row{justify-content:center;margin-bottom:0}

/* -------- Features grid -------- */
.features{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(17rem,1fr));gap:1rem;
}
.feature{
  background:#fff;border:1px solid var(--line);border-radius:.5rem;
  padding:1.2rem 1.3rem;
  transition:border .15s,transform .12s,box-shadow .15s;
}
.feature:hover{border-color:#cbd5e1;transform:translateY(-2px);box-shadow:0 .4rem 1rem rgba(15,23,42,.04)}
.feat-h{display:flex;align-items:baseline;gap:.5rem;margin-bottom:.55rem}
.feat-num{
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  font-size:.7rem;color:var(--accent);font-weight:600;letter-spacing:.05em;
}
.feature h3{font-size:1.05rem;margin:0;font-weight:600;letter-spacing:-.005em;color:var(--fg)}
.feature p{margin:0 0 .5rem;color:var(--fg-mute);font-size:.93rem;line-height:1.6}
.feat-foot{
  font-size:.78rem;color:var(--fg-light);margin:.6rem 0 0;padding-top:.5rem;border-top:1px dashed var(--line);
}

/* -------- Examples table -------- */
.ex-table-wrap{
  background:#fff;border:1px solid var(--line);border-radius:.5rem;overflow:auto;
}
.ex-table{width:100%;border-collapse:collapse;font-size:.92rem}
.ex-table th,.ex-table td{padding:.7rem .9rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
.ex-table th{background:var(--bg-alt);font-weight:600;color:var(--fg-mute);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}
.ex-table tr:last-child td{border-bottom:none}
.ex-table em{color:var(--fg-light);font-style:normal;font-size:.85em}
.vd{
  display:inline-block;padding:.18rem .55rem;border-radius:.25rem;
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:.75rem;font-weight:600;letter-spacing:.02em;
}
.vd-pass{background:var(--pass-bg);color:var(--pass)}
.vd-bot{background:var(--bot-bg);color:var(--bot)}
.vd small{font-weight:400;opacity:.7;margin-left:.25em}
.caption{margin:1rem 0 0;color:var(--fg-light);font-size:.85rem}

/* -------- Modes -------- */
.modes{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.mode{
  background:#fff;border:1px solid var(--line);border-radius:.5rem;padding:1.4rem;
}
.mode-h{display:flex;align-items:center;justify-content:space-between;margin-bottom:.7rem}
.mode-h h3{
  margin:0;font-size:1.2rem;font-weight:700;
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;letter-spacing:-.01em;
}
.mode-badge{
  font-size:.7rem;padding:.18rem .5rem;border-radius:1rem;background:var(--bg-alt);color:var(--fg-mute);
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
}
.mode p{color:var(--fg-mute);font-size:.93rem;margin:0 0 .8rem}
.mode-pts{margin:0;padding-left:1.2rem;font-size:.86rem;color:var(--fg-light)}
.mode-pts li{margin:.25rem 0}

/* -------- Install -------- */
.install-note{color:var(--fg-mute);font-size:.95rem;margin:0 0 1.4rem;max-width:42rem}
.install-foot{margin:1rem 0 0;color:var(--fg-light);font-size:.9rem}
pre.code{
  background:var(--bg-dark);color:#e5e7eb;
  border-radius:.5rem;padding:1.4rem 1.5rem;overflow:auto;
  font-family:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  font-size:.85rem;line-height:1.65;
  border:1px solid var(--line-dark);
}
pre.code .c{color:#7d8590;font-style:italic}

/* -------- Footer -------- */
.footer{padding:2.5rem 0;background:var(--bg-dark);color:#cbd5e1}
.footer-row{display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between}
.footer-brand{display:flex;align-items:center;gap:.5rem;margin:0;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-weight:600;color:#e5e7eb}
.footer-meta{margin:0;font-size:.85rem;color:#94a3b8}
.footer-nav{display:flex;gap:1.2rem;font-size:.88rem}
.footer-nav a{color:#cbd5e1}
.footer-nav a:hover{color:#fff}

/* -------- key-card (= /keys/) -------- */
.key-card{display:grid;grid-template-columns:9rem 1fr;gap:.4rem 1rem;background:#fff;border:1px solid var(--line);border-radius:.5rem;padding:1rem 1.2rem;margin:.8rem 0 1.4rem;font-size:.9rem}
.key-card dt{font-weight:600;color:var(--fg-mute);font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;margin:0}
.key-card dd{margin:0;color:var(--fg);word-break:break-all}
.key-card code{font-size:.78rem}

/* -------- Responsive -------- */
@media (max-width:48rem){
  .nav{gap:.8rem;font-size:.82rem}
  .hero{padding:1.5rem 0 1.5rem}
  .lede{font-size:1rem}
  .modes{grid-template-columns:1fr}
  .footer-row{flex-direction:column;align-items:flex-start;gap:.8rem}
}
@media (max-width:32rem){
  .nav a:nth-child(1),.nav a:nth-child(2){display:none}
}