:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #555555;
  --border: #e5e5e5;
  --accent: #000000;
  --soft: #fafafa;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 20px;
}

h1 {
  font-size: 2rem;
  line-height: 1.35;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.4rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
}

p {
  margin: 0.75rem 0;
}

ul {
  padding-left: 1.2rem;
  margin: 0.75rem 0;
}

li {
  margin: 0.45rem 0;
}

.section {
  margin-top: 3.2rem;
}

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

.box {
  border: 1px solid var(--border);
  background: var(--soft);
  padding: 20px;
  border-radius: 6px;
}

input,
textarea,
button {
  width: 100%;
  font-size: 1rem;
  padding: 11px;
  margin-top: 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-family: inherit;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: #000;
}

button {
  background: var(--accent);
  color: #ffffff;
  border: none;
  cursor: pointer;
  margin-top: 14px;
}

button:hover {
  opacity: 0.9;
}

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}