* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: #18202a;
  background: #f5f7fa;
}
header {
  background: #ffffff;
  border-bottom: 1px solid #d9e0e8;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 20px; }
.price { color: #3d4a59; }
nav { display: flex; gap: 14px; flex-wrap: wrap; }
nav a { color: #145c9e; font-weight: 600; text-decoration: none; }
main { max-width: 1160px; margin: 28px auto; padding: 0 20px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.panel {
  background: #ffffff;
  border: 1px solid #d9e0e8;
  border-radius: 8px;
  padding: 18px;
}
h1, h2, h3 { margin: 0 0 12px; }
p { line-height: 1.45; color: #445160; }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
input, textarea, select {
  width: 100%;
  padding: 10px 11px;
  border: 1px solid #b9c4d0;
  border-radius: 6px;
  font: inherit;
  background: #fff;
}
textarea { min-height: 120px; resize: vertical; }
button {
  margin-top: 14px;
  padding: 10px 14px;
  border: 0;
  border-radius: 6px;
  background: #145c9e;
  color: white;
  font-weight: 700;
  cursor: pointer;
}
button.secondary { background: #eef2f6; color: #18202a; }
table { width: 100%; border-collapse: collapse; margin-top: 12px; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid #e4e9ef; vertical-align: top; }
th { color: #526170; font-size: 13px; }
code, .key {
  font-family: Consolas, monospace;
  background: #eef2f6;
  border: 1px solid #d6dee8;
  border-radius: 4px;
  padding: 2px 5px;
}
.notice {
  padding: 12px;
  border-radius: 6px;
  background: #edf7f1;
  border: 1px solid #b8dfc7;
  color: #1e5b34;
  margin: 12px 0;
}
.error {
  background: #fff0f0;
  border-color: #efc0c0;
  color: #8a2525;
}
.muted { color: #667586; font-size: 13px; }
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.toolbar input { max-width: 320px; }
.hidden { display: none; }