body {
  font-family: sans-serif;
  font-size: 14px;
  background: #fff;
  color: #000;
  margin: 0;
  padding: 0;
}

/* Layout */
.center-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

/* Navbar */
.navbar {
  background: #eee;
  border-bottom: 1px solid #999;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Card */
.card {
  border: 1px solid #999;
  padding: 16px;
  margin-bottom: 16px;
}

.card h3 { margin: 0 0 12px 0; font-size: 15px; }
.card h4 { margin: 0 0 6px 0; font-size: 14px; }

/* Typography */
.subtitle  { color: #555; font-size: 13px; margin-bottom: 8px; }
.mono      { font-family: monospace; font-size: 13px; }

/* Forms */
label {
  display: block;
  margin-top: 10px;
  margin-bottom: 3px;
}

input[type="text"],
input[type="password"],
textarea,
select {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid #999;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  box-sizing: border-box;
}

textarea {
  resize: vertical;
  font-family: monospace;
  font-size: 13px;
}

.select-input { flex: 1; }

/* Buttons */
button, .btn-primary {
  padding: 5px 12px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid #999;
  background: #eee;
  color: #000;
  text-decoration: none;
}

button:hover, .btn-primary:hover { background: #ddd; }
button:disabled, .btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary  { background: #dde8ff; border-color: #668; }
.btn-outline  { background: #fff; border: 1px solid #999; }
.btn-danger   { background: #fdd; border-color: #c66; }
.btn-sm       { padding: 2px 8px; font-size: 12px; }
.full-width   { width: 100%; box-sizing: border-box; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th    { text-align: left; padding: 6px 8px; background: #eee; border: 1px solid #ccc; font-weight: bold; }
td    { padding: 5px 8px; border-bottom: 1px solid #ddd; vertical-align: middle; }
tr:hover td { background: #f9f9f9; }
.center-text { text-align: center; color: #555; }

/* Badges */
.badge          { font-size: 11px; font-weight: bold; padding: 1px 6px; border: 1px solid #bbb; }
.badge-pending  { background: #fff3cd; border-color: #aaa; }
.badge-done     { background: #d4edda; border-color: #aaa; }
.badge-error    { background: #f8d7da; border-color: #aaa; }
.badge-canceled { background: #e2e3e5; border-color: #aaa; }

/* Feedback */
.error   { border: 1px solid #c00; background: #fdd; color: #900; padding: 6px 10px; margin-top: 8px; font-size: 13px; }
.success { border: 1px solid #090; background: #dfd; color: #060; padding: 6px 10px; margin-top: 8px; font-size: 13px; }

.hidden       { display: none !important; }
.success-text { color: #060; }

/* Utility */
.row-gap { display: flex; align-items: center; gap: 8px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

@media (max-width: 640px) {
  .two-col { grid-template-columns: 1fr; }
}