:root {
  --primary: #0052cc;
  --secondary: #6c757d;
  --bg: #ffffff;
  --text: #222;
  --muted: #888;
  --radius: 12px;
  --max-width: 1100px;
  --spacing: 1rem;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

h1,
h2 {
  margin: 1.2rem 0 0.6rem;
}
.subtitle {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

form {
  background: #f8f9fa;
  padding: var(--spacing);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  display: grid;
  gap: var(--spacing);
}
.form-group {
  display: flex;
  flex-direction: column;
}
.form-group label {
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.form-group input,
.form-group select {
  padding: 0.55rem 0.7rem;
  border: 1px solid #ccc;
  border-radius: var(--radius);
  font-size: 1rem;
}

.form-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
button {
  cursor: pointer;
  padding: 0.65rem 1.1rem;
  border: none;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
}
button.secondary {
  background: var(--secondary);
}
button:disabled {
  background: #bbb;
  cursor: not-allowed;
}
.advanced summary {
  cursor: pointer;
  font-weight: 600;
}
.advanced > div {
  margin-top: var(--spacing);
}

/* Ads */
.ad-slot {
  margin: 1.5rem 0;
}
.ad-placeholder {
  background: #e9ecef;
  border: 2px dashed #ced4da;
  padding: 1.5rem;
  text-align: center;
  color: #6c757d;
  font-size: 0.9rem;
  border-radius: var(--radius);
}

#result-section.hidden {
  display: none;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  margin-bottom: var(--spacing);
  flex-wrap: wrap;
}

/* Table */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid #dee2e6;
  border-radius: var(--radius);
}
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}
thead {
  background: #f1f3f5;
}
th,
td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid #e9ecef;
  text-align: right;
  white-space: nowrap;
}
th:first-child,
td:first-child,
th:nth-child(2),
td:nth-child(2) {
  text-align: left;
}
tbody tr:nth-child(even) {
  background: #fafbfc;
}

/* Layout responsivo simples */
@media (min-width: 992px) {
  main {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
  }
  #form-section,
  #result-section {
    grid-column: 1 / 2;
  }
  #ad-sidebar {
    grid-column: 2 / 3;
    position: sticky;
    top: 1rem;
    align-self: start;
  }
}