*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#FFFFFF;--bg-card:#FAFAFA;--bg-elevated:#F5F5F5;
  --text:#151515;--text-sub:#555;--text-muted:#999;
  --accent:#6C5CE7;--accent-light:#A78BFA;--accent-dim:rgba(108,92,231,.08);
  --border:#E5E5E5;--radius:12px;--max-w:720px;
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.8;min-height:100vh;
  display:flex;flex-direction:column}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* ===== Header ===== */
.header{background:rgba(255,255,255,.85);border-bottom:1px solid var(--border);
  padding:14px 24px;position:sticky;top:0;z-index:10;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.header-inner{max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.header-logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1rem}
.header-logo:hover{text-decoration:none}
.header-logo img{height:28px}
.header-nav{display:flex;gap:20px;font-size:.84rem}
.header-nav a{color:var(--text-sub);transition:color .2s}
.header-nav a:hover{color:var(--text);text-decoration:none}

/* ===== Hero ===== */
.hero{text-align:center;padding:80px 24px 64px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse at 50% 0%,rgba(108,92,231,.06) 0%,transparent 70%);pointer-events:none}
.hero-logo{height:60px;margin-bottom:24px}
.hero-icon{width:100px;height:100px;border-radius:24px;margin-bottom:28px;
  box-shadow:0 4px 20px rgba(0,0,0,.08)}
.hero p{font-size:1.05rem;color:var(--text-sub);max-width:440px;margin:0 auto 36px;line-height:1.9}
.hero-badges{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-badges img{height:44px}

/* ===== Features ===== */
.features{max-width:var(--max-w);margin:0 auto;padding:56px 24px;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.feature-card{background:var(--bg);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px;transition:border-color .2s,box-shadow .2s}
.feature-card:hover{border-color:#CCC;box-shadow:0 2px 12px rgba(0,0,0,.04)}
.feature-card .icon{font-size:1.6rem;margin-bottom:14px;
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  background:var(--accent-dim);border-radius:10px}
.feature-card h3{font-size:.95rem;margin-bottom:8px;color:var(--text)}
.feature-card p{font-size:.84rem;color:var(--text-sub);line-height:1.7}

/* ===== Content page ===== */
.content{max-width:var(--max-w);margin:0 auto;padding:48px 24px 80px;flex:1}
.content h1{font-size:1.5rem;font-weight:700;margin-bottom:8px;color:var(--text);
  padding-bottom:12px;border-bottom:1px solid var(--border)}
.content .updated{font-size:.8rem;color:var(--text-muted);margin-bottom:32px}
.content h2{font-size:1.08rem;font-weight:700;margin:32px 0 12px;
  padding-left:12px;border-left:3px solid var(--accent);color:var(--text)}
.content h3{font-size:.95rem;font-weight:600;margin:20px 0 8px;color:var(--text)}
.content p,.content li{font-size:.9rem;color:var(--text-sub);line-height:1.85}
.content ul,.content ol{padding-left:1.4em;margin-bottom:16px}
.content li{margin-bottom:6px}
.content li::marker{color:var(--text-muted)}
.content p{margin-bottom:14px}

/* ===== Contact ===== */
.contact-card{background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px;margin-top:24px}
.contact-card p{margin-bottom:12px}
.contact-link{display:inline-flex;align-items:center;gap:6px;
  background:var(--text);color:#FFF;padding:10px 24px;border-radius:8px;
  font-weight:600;font-size:.9rem;margin-top:8px;transition:opacity .2s}
.contact-link:hover{opacity:.8;text-decoration:none;color:#FFF}

/* ===== Footer ===== */
.footer{border-top:1px solid var(--border);text-align:center;
  padding:32px 24px;font-size:.8rem;color:var(--text-muted);margin-top:auto}
.footer-inner{max-width:var(--max-w);margin:0 auto}
.footer-logo{height:22px;opacity:.35;margin-bottom:16px}
.footer-links{display:flex;gap:20px;justify-content:center;margin-bottom:12px;flex-wrap:wrap}
.footer-links a{color:var(--text-muted);transition:color .2s}
.footer-links a:hover{color:var(--text-sub);text-decoration:none}

/* ===== Responsive ===== */
@media(max-width:600px){
  .hero{padding:56px 20px 48px}
  .hero-logo{height:44px}
  .hero-icon{width:80px;height:80px;border-radius:20px}
  .header-nav{gap:14px;font-size:.78rem}
  .content{padding:32px 20px 60px}
  .features{padding:40px 20px}
}