:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #15202b;
  --muted: #5f6c7b;
  --primary: #0c7a6f;
  --primary-strong: #085f56;
  --border: #d8dee4;
  --good: #0f7a3f;
  --warn: #b02a37;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at top right, #e4f5f2, transparent 35%), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 980px;
  margin: 32px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 6px 24px rgba(21, 32, 43, 0.06);
}

h1, h2 {
  margin-top: 0;
}

.subtitle {
  color: var(--muted);
  margin-bottom: 20px;
}

.form {
  display: grid;
  gap: 10px;
}

label {
  font-size: 0.95rem;
  font-weight: 600;
}

input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
}

input:focus {
  outline: 2px solid #7bc9be;
  border-color: #7bc9be;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"] {
  background: var(--primary);
  color: #fff;
}

button[type="submit"]:hover {
  background: var(--primary-strong);
}

.secondary {
  background: #eef2f5;
  color: var(--text);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.result-grid article {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  background: #fafbfc;
}

.result-grid h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
  color: var(--muted);
}

.result-grid p {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.note {
  margin-top: 12px;
  min-height: 20px;
  font-size: 0.95rem;
}

.good {
  color: var(--good);
}

.warn {
  color: var(--warn);
}

@media (max-width: 640px) {
  .app {
    margin: 20px auto;
  }
}