:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #15202b;
  --muted: #5f6b76;
  --border: #d9e1e8;
  --accent: #1f6feb;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8fbff 0%, #eff4f8 100%);
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
}

header h1 {
  margin: 0;
  font-size: 20px;
}

#status {
  margin: 0;
  color: var(--muted);
}

main {
  max-width: 1200px;
  margin: 18px auto;
  padding: 0 16px 24px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.hidden {
  display: none;
}

h2, h3 {
  margin: 0 0 12px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input, select, button {
  font: inherit;
}

input, select {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fff;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  margin-top: 10px;
}

button.secondary {
  background: #4b5563;
}

button.danger {
  background: var(--danger);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 13px;
}

th, td {
  text-align: left;
  border-bottom: 1px solid var(--border);
  padding: 8px 6px;
  vertical-align: middle;
}

.hint {
  color: var(--muted);
  font-size: 12px;
  margin-top: 8px;
}

#messages {
  max-width: 1200px;
  margin: 0 auto 24px;
  padding: 0 16px;
}

.msg {
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 8px;
  border: 1px solid var(--border);
  background: #fff;
}

.msg.error {
  border-color: #f5c2c0;
  background: #fff6f5;
}

.msg.ok {
  border-color: #bdddbd;
  background: #f6fff6;
}