* { box-sizing: border-box; }
body { font-family: -apple-system, "Segoe UI", "Malgun Gothic", sans-serif; margin: 0; background: #f6f7f9; color: #222; }
header { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: #1a2233; color: #fff; }
header .brand { color: #fff; font-weight: bold; text-decoration: none; font-size: 1.2rem; }
header nav a { color: #cdd6e6; margin-left: 1.2rem; text-decoration: none; }
header nav a:hover { color: #fff; }
main { max-width: 800px; margin: 2rem auto; padding: 0 1rem; }
h1 { margin-top: 0; }
.card { background: #fff; border-radius: 8px; padding: 1.5rem; box-shadow: 0 1px 3px rgba(0,0,0,.1); display: flex; flex-direction: column; gap: .8rem; max-width: 420px; }
.card label { display: flex; flex-direction: column; gap: .3rem; font-size: .9rem; color: #555; }
.card input, .card select { padding: .5rem; border: 1px solid #ccc; border-radius: 4px; font-size: 1rem; }
button, .button { background: #2b5cff; color: #fff; border: none; padding: .6rem 1.2rem; border-radius: 4px; cursor: pointer; text-decoration: none; display: inline-block; font-size: .95rem; }
button:hover, .button:hover { background: #1e46cc; }
.error { color: #c0392b; background: #fdecea; padding: .7rem 1rem; border-radius: 4px; }
.notice { color: #1a7a3c; background: #e9f9ee; padding: .7rem 1rem; border-radius: 4px; }
.hint { color: #666; font-size: .9rem; }
table.list { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; margin-bottom: 1.5rem; }
table.list th, table.list td { text-align: left; padding: .6rem .8rem; border-bottom: 1px solid #eee; }
table.list th { background: #f0f2f5; font-size: .85rem; color: #555; }
code { background: #eef1f6; padding: .1rem .4rem; border-radius: 3px; }