:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1b2430;
  --muted: #5b6775;
  --line: #d7dee7;
  --accent: #0f6a5a;
  --danger: #9b1c1c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #e8eef3 0%, var(--bg) 40%);
  min-height: 100vh;
}
.topbar {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: rgba(255,255,255,0.92);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
}
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
.topbar nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.topbar a { color: var(--accent); text-decoration: none; }
.container { max-width: 960px; margin: 0 auto; padding: 1.25rem; }
.auth-card {
  max-width: 420px;
  margin: 3rem auto;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid var(--line);
}
.stack { display: grid; gap: 0.75rem; }
.stack.narrow { max-width: 360px; }
.stack-tight { display: flex; gap: 0.35rem; flex-wrap: wrap; align-items: center; }
label { display: grid; gap: 0.25rem; font-size: 0.95rem; }
input, select, button {
  font: inherit;
  padding: 0.45rem 0.55rem;
}
button {
  background: var(--accent);
  color: white;
  border: 0;
  cursor: pointer;
}
.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin: 1rem 0;
}
article, section {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1rem;
  margin-bottom: 1rem;
}
.stat { font-size: 1.6rem; font-weight: 700; margin: 0.25rem 0; }
.muted { color: var(--muted); }
.error { color: var(--danger); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.45rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.inline { display: inline; }
button.danger { background: var(--danger); }
textarea {
  font: inherit;
  padding: 0.45rem 0.55rem;
  min-height: 4rem;
}
.list { list-style: none; padding: 0; }
.list li { padding: 0.5rem 0; border-bottom: 1px solid var(--line); }
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; }
  table { font-size: 0.92rem; }
}