:root{
  --main:#4a90e2;
  --bg:#f3f6fb;
  --card:#ffffff;
  --text:#333;
  --border:#d9e2ef;
}

*{
  box-sizing:border-box;
}

body{
  margin:0;
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  background:linear-gradient(135deg,#dfe9f3,#f8fbff);
  font-family:"Segoe UI","Yu Gothic","Meiryo",sans-serif;
  color:var(--text);
}

form{
  width:100%;
  max-width:380px;
  background:var(--card);
  padding:40px 32px;
  border-radius:18px;
  box-shadow:
    0 10px 30px rgba(0,0,0,0.08),
    0 2px 8px rgba(0,0,0,0.05);
}

form::before{
  content:"LOGIN";
  display:block;
  text-align:center;
  font-size:28px;
  font-weight:bold;
  letter-spacing:2px;
  color:var(--main);
  margin-bottom:30px;
}

input[type="text"],
input[type="password"],
input[name="id"]{
  width:100%;
  height:48px;
  margin-top:8px;
  margin-bottom:20px;
  padding:0 14px;
  border:1px solid var(--border);
  border-radius:10px;
  background:#fafcff;
  font-size:16px;
  transition:.2s;
}

input:focus{
  outline:none;
  border-color:var(--main);
  background:#fff;
  box-shadow:0 0 0 4px rgba(74,144,226,.15);
}

label{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  margin-bottom:24px;
  color:#666;
}

button{
  width:100%;
  height:50px;
  border:none;
  border-radius:10px;
  background:var(--main);
  color:#fff;
  font-size:16px;
  font-weight:bold;
  cursor:pointer;
  transition:.2s;
}

button:hover{
  transform:translateY(-1px);
  box-shadow:0 6px 16px rgba(74,144,226,.3);
  opacity:.95;
}

button:active{
  transform:translateY(0);
}

.msg{
  color:#d00;
  text-align:center;
  margin-bottom:20px;
  font-size:14px;
}