:root {
  --bg: #f4f4f2;
  --card: #ffffff;
  --ink: #222222;
  --accent: #0f4c5c;
  --accent-dark: #073642;
  --muted: #6b6b6b;
  --ok: #2a9d8f;
  --bad: #e76f51;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  background: radial-gradient(circle at top, #ffffff, var(--bg));
  color: var(--ink);
}

a {
  color: var(--accent);
  text-decoration: none;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  background: var(--accent);
  color: #fff;
  padding: 20px 0;
}

.brand {
  font-size: 1.4rem;
  font-weight: bold;
  letter-spacing: 0.5px;
}

.nav {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.nav a {
  color: #fff;
  font-weight: 600;
}

.site-footer {
  margin-top: 40px;
  padding: 20px 0 40px;
  text-align: center;
  color: var(--muted);
}

.card {
  background: var(--card);
  padding: 24px;
  margin: 24px 0;
  border-radius: 12px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.card.narrow {
  max-width: 520px;
  margin: 32px auto;
}

label {
  display: block;
  font-weight: 600;
  margin: 14px 0 6px;
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d2d2d2;
  border-radius: 8px;
  font-size: 1rem;
}

button, .button {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button:hover, .button:hover {
  background: var(--accent-dark);
}

.flash-list {
  margin-top: 20px;
}

.flash {
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 10px;
  font-weight: 600;
}

.flash.error {
  background: #ffe5df;
  color: #7a2a13;
}

.flash.success {
  background: #dbf5f0;
  color: #0f4c5c;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th, table td {
  padding: 10px 12px;
  border-bottom: 1px solid #e0e0e0;
  text-align: left;
}

.test-grid {
  display: grid;
  gap: 16px;
}

.test-row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 12px;
  align-items: center;
}

.test-row .inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.panel {
  padding: 16px;
  border: 1px solid #e6e6e6;
  border-radius: 10px;
}

.answer.expected {
  color: var(--muted);
  font-size: 0.9rem;
}

tr.ok {
  background: #f0fbf8;
}

tr.bad {
  background: #fff1ee;
}

@media (max-width: 720px) {
  .test-row {
    grid-template-columns: 1fr;
  }
}