:root {
  --ink: #16324a;
  --muted: #5a6f80;
  --line: #d5dfe6;
  --brand: #17627f;
  --ok: #17693f;
  --error: #b3261e;
  --page: #f5f8fa;
  --card: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

header h1 { margin: 0; font-size: 1.15rem; }
a { color: var(--brand); }

main {
  max-width: 760px;
  margin: 24px auto;
  padding: 0 16px;
}

h2 { margin: 0 0 4px; }
.note { margin: 0 0 20px; color: var(--muted); }

form {
  display: grid;
  gap: 16px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}

form[hidden] { display: none; }

label { display: grid; gap: 4px; font-weight: 600; }

input, select {
  width: 100%;
  padding: 10px;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
}

fieldset {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

legend { padding: 0 4px; font-weight: 600; }

.slots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
}

.slots label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
}

.slots input { width: auto; }

button {
  padding: 11px 16px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

button:disabled { opacity: 0.6; cursor: wait; }

button.secondary {
  margin-bottom: 12px;
  color: var(--brand);
  background: transparent;
  border: 1px solid var(--brand);
}

#message { min-height: 24px; margin-top: 16px; font-weight: 600; overflow-wrap: anywhere; }
.ok { color: var(--ok); }
.error { color: var(--error); }

.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}

table { width: 100%; border-collapse: collapse; }

th, td {
  padding: 10px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}