:root{
  --bg1:#0f172a;
  --bg2:#111827;
  --card:#0b1220cc;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --accent:#34d399; /* emerald-400 */
  --accent2:#60a5fa;/* blue-400 */
  --ring: rgba(52,211,153,.30);
}
*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Arial, sans-serif;
  color:var(--text);
  background:
    radial-gradient(1100px 600px at 20% 10%, rgba(52,211,153,.18), transparent 60%),
    radial-gradient(900px 500px at 85% 35%, rgba(96,165,250,.16), transparent 60%),
    linear-gradient(160deg, var(--bg1), var(--bg2));
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.wrap{ width:min(820px, 100%); }
header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-bottom:18px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:inherit;
}
.dot{
  width:14px; height:14px; border-radius:50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 0 6px rgba(52,211,153,.08);
}
nav a{
  color:var(--muted);
  text-decoration:none;
  padding:10px 12px;
  border-radius:10px;
  transition: .15s ease;
}
nav a:hover{
  color:var(--text);
  background: rgba(255,255,255,.06);
}
.card{
  background: var(--card);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(0,0,0,.35);
  backdrop-filter: blur(10px);
}
h1{
  margin:0 0 10px;
  font-size: clamp(24px, 3.5vw, 38px);
  line-height:1.15;
  letter-spacing:-0.02em;
}
p{
  margin:0 0 14px;
  color: var(--muted);
  line-height:1.75;
}
.list{
  margin:18px 0 0;
  padding:0;
  list-style:none;
  display:grid;
  gap:10px;
}
.item{
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: var(--text);
}
.item small{
  display:block;
  color: var(--muted);
  margin-top:4px;
}
.actions{
  display:flex;
  gap:12px;
  margin-top:22px;
  flex-wrap:wrap;
}
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  color: var(--text);
  text-decoration:none;
  transition: .15s ease;
  box-shadow: 0 0 0 0 var(--ring);
}
.btn:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.10);
  box-shadow: 0 0 0 6px var(--ring);
}
.btn.primary{
  border-color: rgba(52,211,153,.35);
  background: linear-gradient(135deg, rgba(52,211,153,.22), rgba(96,165,250,.14));
}