/* base */
:root{
  --bg:#f7f7f8;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --radius:14px;
}

*{box-sizing:border-box}
body{
  font-family:system-ui,-apple-system,"Segoe UI","Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  margin:0;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
}

/* center layout */
.page{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:28px 16px;
}

/* card */
.card{
  width:min(720px, 100%);
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
}

.card h1{
  font-size:20px;
  margin:0 0 14px;
}
.card .sub{
  color:var(--muted);
  font-size:13px;
  margin:-6px 0 18px;
}

/* form */
form{
  display:grid;
  grid-template-columns: 170px 1fr;
  gap:12px 14px;
  align-items:center;
}

label{
  display:block;
  font-size:13px;
  color:var(--muted);
}

input,select{
  width:100%;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:10px;
  background:#fff;
  outline:none;
}
input:focus,select:focus{
  border-color:#94a3b8;
  box-shadow:0 0 0 4px rgba(148,163,184,.25);
}

.actions{
  grid-column: 1 / -1;
  display:flex;
  justify-content:flex-end;
  gap:10px;
  margin-top:6px;
}

button{
  appearance:none;
  border:1px solid #111827;
  background:#111827;
  color:#fff;
  padding:10px 16px;
  border-radius:10px;
  cursor:pointer;
  font-weight:600;
}
button:hover{opacity:.92}

/* error box */
.err{
  border:1px solid var(--border);
  background:#fff7ed;
  padding:10px 12px;
  border-radius:10px;
  margin:0 0 14px;
}

/* mobile */
@media (max-width: 640px){
  .card{padding:18px}
  form{grid-template-columns: 1fr}
  .actions{justify-content:stretch}
  button{width:100%}
}

.alert{
  grid-column: 1 / -1;
  margin: 6px 0 14px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
}

.actions{
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
}

.alert{
  grid-column:1 / -1;
  padding:10px 12px;
  border:1px solid var(--border);
  background:#fff;
  border-radius:10px;
  margin:0 0 12px;
}