:root{
  --bg:#0b0f14;
  --panel:#101826;
  --text:#e7eef8;
  --muted:#a9b6c7;
  --line:rgba(231,238,248,.12);
  --accent:#66d9ef;
  --max: 920px;
  --radius: 18px;
  --shadow: 0 12px 40px rgba(0,0,0,.35);
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Meiryo", sans-serif;
  color:var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(102,217,239,.18), transparent 60%),
              var(--bg);
  line-height:1.85;
}

a{ color:inherit; }
.container{
  width:min(var(--max), calc(100% - 32px));
  margin:0 auto;
}

.header{
  position:sticky;
  top:0;
  backdrop-filter: blur(10px);
  background: rgba(11,15,20,.7);
  border-bottom:1px solid var(--line);
}

.header-inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 0;
  gap:16px;
}

.brand .title{ font-weight:800; letter-spacing:.05em; }
.brand .sub{ font-size:12px; color:var(--muted); }

.link{ color:var(--muted); text-decoration:none; }
.link:hover{ color:var(--text); text-decoration:underline; }

.card{
  margin:18px 0;
  padding:16px;
  background: linear-gradient(180deg, rgba(16,24,38,.92), rgba(16,24,38,.72));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

h1,h2{ margin:0 0 10px; }
h1{ font-size:22px; }
h2{ font-size:18px; }

.alert{
  padding:10px 12px;
  border-radius:14px;
  background: rgba(255, 99, 132, .12);
  border:1px solid rgba(255, 99, 132, .25);
  color: var(--text);
  margin: 10px 0 14px;
}

.form{ margin-top:8px; }
.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap:12px;
}
label{ display:flex; flex-direction:column; gap:6px; }
label span{ font-size:12px; color:var(--muted); }

input{
  padding:10px 12px;
  border-radius:14px;
  border:1px solid rgba(231,238,248,.16);
  background: rgba(231,238,248,.06);
  color:var(--text);
  outline:none;
}
input:focus{
  border-color: rgba(102,217,239,.45);
}

.full{ grid-column: 1 / -1; }

.btn{
  margin-top:12px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 14px;
  border-radius:14px;
  border:1px solid rgba(102,217,239,.35);
  background: linear-gradient(180deg, rgba(102,217,239,.20), rgba(102,217,239,.10));
  color:var(--text);
  font-weight:700;
  cursor:pointer;
}
.btn:hover{
  border-color: rgba(102,217,239,.55);
}

.story{
  white-space: pre-wrap;
  color: var(--text);
  border: 1px solid rgba(231,238,248,.14);
  border-radius: 14px;
  padding: 12px;
  background: rgba(231,238,248,.04);
}

.actions{
  margin-top: 12px;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.btn-secondary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 12px;
  border-radius:14px;
  border:1px solid rgba(231,238,248,.16);
  background: rgba(231,238,248,.06);
  color:var(--text);
  text-decoration:none;
  cursor:pointer;
}
.btn-secondary:hover{
  border-color: rgba(102,217,239,.35);
}

.footer{
  border-top:1px solid var(--line);
  padding:18px 0 26px;
  color:var(--muted);
  font-size:12px;
}

@media (max-width: 780px){
  .grid{ grid-template-columns: 1fr; }
}