/* --- reset --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

img, video {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* --- base --- */
body {
  font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #222;
  background-color: #fff;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  margin-bottom: 0.5em;
}

p {
  margin-bottom: 1em;
}

/* --- layout --- */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  margin-bottom: 2rem;
}

main {
  margin-bottom: 2rem;
}

section {
  margin-bottom: 2rem;
}

footer {
  font-size: 0.85em;
  color: #777;
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid #eee;
}

button {
  background: #222;
  color: #fff;
  border: none;
  padding: 0.5em 1em;
  border-radius: 4px;
}

button:hover {
  background: #444;
}