:root {
  --navy: #12324e;
  --teal: #0f766e;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #e2e6ea;
  --bg: #f4f7fa;
  --card: #fff;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.45 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
.top {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 12px 20px; background: var(--navy); color: #dce6f1;
}
.brand strong { display: block; color: #fff; font-size: 16px; }
.brand span { color: #9db6d0; font-size: 12px; }
.mode { margin: 0; font-size: 12px; color: #9db6d0; }
.tabs { display: flex; gap: 8px; padding: 10px 20px 0; }
.tabs button {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-weight: 700;
  padding: 8px 10px; border-bottom: 2px solid transparent; cursor: pointer;
}
.tabs button.on { color: var(--navy); border-bottom-color: var(--teal); }
main { padding: 16px 20px 32px; }
.panel { display: none; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.panel.on { display: block; }
h1 { margin: 0 0 14px; font-size: 18px; }
h2 { margin: 22px 0 10px; font-size: 14px; color: var(--muted); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 12px; font-weight: 600; }
form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; max-width: 720px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; font-weight: 600; color: var(--muted); }
input, select {
  font: inherit; padding: 8px 10px; border: 1px solid #c5d0db; border-radius: 6px; color: var(--ink);
}
.row { grid-column: 1 / -1; display: flex; gap: 10px; align-items: center; }
button {
  font: inherit; font-weight: 700; padding: 8px 14px; border: 0; border-radius: 8px;
  background: var(--teal); color: #fff; cursor: pointer;
}
button.ghost { background: transparent; color: var(--navy); border: 1px solid #2e6ca4; }
.hint { grid-column: 1 / -1; margin: 0; color: var(--muted); }
.linkish { background: none; color: var(--teal); padding: 0; font-weight: 600; }
@media (max-width: 720px) {
  form { grid-template-columns: 1fr; }
  .top { flex-direction: column; align-items: flex-start; }
}