:root {
  --bg: #f6efe0;
  --card: #fffaf0;
  --ink: #3a2414;
  --muted: #6b5442;
  --accent: #4e9a2e;
  --accent-dark: #3c7a22;
  --red: #c0392b;
  --line: #e2d4bb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header.top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

header.top a { color: var(--ink); text-decoration: none; font-weight: 800; font-size: 20px; }

h1 { font-size: 30px; line-height: 1.2; margin: 16px 0 4px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
p, li { max-width: 68ch; }
a { color: var(--accent-dark); }
.muted { color: var(--muted); font-size: 15px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin: 20px 0;
}

nav.links { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
nav.links a {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  text-decoration: none;
  font-weight: 700;
}

form { display: grid; gap: 12px; max-width: 420px; }
label { font-weight: 700; display: grid; gap: 4px; }
input {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}
button {
  font: inherit;
  font-weight: 800;
  padding: 12px 16px;
  border: 0;
  border-radius: 12px;
  background: var(--red);
  color: #fff;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }

.result { font-weight: 700; }
.result.ok { color: var(--accent-dark); }
.result.error { color: var(--red); }

footer { margin-top: 40px; color: var(--muted); font-size: 14px; }