* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans KR", "Malgun Gothic", Arial, sans-serif;
  background: #f3f6fb;
  color: #182033;
}
a { color: inherit; text-decoration: none; }
.admin-layout { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }
.sidebar {
  background: #101827;
  color: white;
  padding: 26px 18px;
}
.sidebar h1 { font-size: 22px; margin: 0 0 28px; }
.sidebar a {
  display: block;
  padding: 13px 14px;
  border-radius: 12px;
  color: #dbe4ff;
  margin-bottom: 6px;
}
.sidebar a:hover, .sidebar a.active { background: #1f55e6; color: #fff; }
.content { padding: 34px; }
.page-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
}
.page-title h2 { margin: 0; font-size: 30px; }
.box {
  background: white;
  border: 1px solid #e2e8f5;
  border-radius: 20px;
  padding: 22px;
  box-shadow: 0 16px 50px rgba(24, 40, 80, .07);
}
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.stat strong { display:block; font-size: 34px; color: #1f55e6; }
.stat span { color: #64708a; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 12px;
  background: #1f55e6;
  color: white;
  border: 0;
  font-weight: 800;
  cursor: pointer;
}
.btn.gray { background: #e8edf7; color: #22304d; }
.btn.red { background: #d92d20; color: white; }
.btn.small { min-height: 34px; padding: 0 12px; font-size: 13px; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #edf1f8; padding: 13px 10px; text-align: left; vertical-align: middle; }
th { color: #64708a; font-size: 14px; }
.thumb-mini {
  width: 80px; height: 54px; object-fit: cover; border-radius: 8px; background: #e9eef8;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.form-row { margin-bottom: 18px; }
.form-row.full { grid-column: 1 / -1; }
label { display:block; font-weight: 800; margin-bottom: 8px; }
input, textarea, select {
  width: 100%;
  border: 1px solid #d7deec;
  border-radius: 12px;
  padding: 12px 13px;
  font-size: 15px;
  background: #fff;
}
textarea { min-height: 150px; resize: vertical; }
.alert { padding: 14px 16px; border-radius: 12px; margin-bottom: 18px; }
.alert.ok { background: #e9f8ef; color: #146c2e; }
.alert.err { background: #fff0f0; color: #b42318; }
.login-page {
  min-height: 100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 20px;
}
.login-box { width: 100%; max-width: 420px; }
.help { font-size: 13px; color: #69758f; margin-top: 6px; line-height: 1.6; }
.actions { display:flex; gap: 8px; flex-wrap: wrap; }
@media (max-width: 800px) {
  .admin-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .form-grid, .stats { grid-template-columns: 1fr; }
  .content { padding: 20px; overflow-x: auto; }
}