body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f5f7;
  color: #1f2933;
}

.container {
  width: min(960px, 92%);
  margin: 0 auto;
  padding: 2rem 0;
}

.site-header {
  background-color: #0b3d91;
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1.5rem;
  margin: 0;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-nav a {
  color: #ffffff;
  text-decoration: none;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus {
  text-decoration: underline;
}

main.container {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.panel {
  background-color: #ffffff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
  margin-bottom: 2rem;
}

.form-grid {
  display: grid;
  gap: 1rem;
  max-width: 480px;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-weight: 600;
  color: #111827;
}

.form-grid input,
.form-grid textarea,
.form-grid select {
  padding: 0.6rem 0.75rem;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 1rem;
}

.form-grid input:focus,
.form-grid textarea:focus,
.form-grid select:focus {
  outline: 2px solid #2563eb;
  outline-offset: 1px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  background-color: #e2e8f0;
  color: #0f172a;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover,
.btn:focus {
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.1);
}

.btn.primary {
  background-color: #2563eb;
  color: #ffffff;
}

.btn.primary:hover,
.btn.primary:focus {
  background-color: #1d4ed8;
}

.result-output {
  background-color: #0f172a;
  color: #f8fafc;
  padding: 1rem;
  border-radius: 8px;
  font-family: "Fira Code", "Consolas", "Courier New", monospace;
  overflow-x: auto;
  margin-top: 1.5rem;
}

.monospace-input {
  width: 100%;
  font-family: "Fira Code", "Consolas", "Courier New", monospace;
  min-height: 120px;
}

.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.table-container {
  margin-top: 1.5rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  border-radius: 12px;
  overflow: hidden;
  background-color: #f8fafc;
}

thead {
  background-color: #0b3d91;
  color: #ffffff;
}

th,
td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

tbody tr:nth-child(even) {
  background-color: #eef2ff;
}

.empty-state {
  margin-top: 1.5rem;
  color: #64748b;
  font-style: italic;
}

.hidden {
  display: none;
}

.feedback {
  margin-top: 1rem;
  font-weight: 600;
}

.feedback.success {
  color: #047857;
}

.feedback.error {
  color: #b91c1c;
}

.site-footer {
  background-color: #0b3d91;
  color: #ffffff;
  margin-top: 3rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 0;
  font-size: 0.9rem;
}