:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fafafa;
  --accent: #1db954;
  --border: #ddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eee;
    --bg: #121212;
    --border: #333;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  max-width: 760px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  line-height: 1.5;
}

h1 { font-size: 1.5rem; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

input[type="text"], input[type="password"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--fg);
  box-sizing: border-box;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.4rem;
  text-align: left;
}

td input {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--fg);
}

.error { color: #d33; }
.muted { opacity: 0.7; font-size: 0.9rem; }
section { margin: 1.5rem 0; }