* {
  box-sizing: border-box;
}

body,
h1,
p,
div,
header,
nav,
a,
button {
  margin: 0;
}

body {
  font-family: Arial, sans-serif;
  background: #f6f2eb;
  color: #2f2a25;
  padding: 32px;
}

.page {
  max-width: 860px;
  margin: 0 auto;
}

.top-nav {
  max-width: 860px;
  margin: 0 auto 24px;
  padding: 16px 20px;
  background: white;
  border: 1px solid #ddd0bf;
  border-radius: 16px;
}

.top-nav a {
  color: #7c3f00;
  text-decoration: none;
  font-weight: bold;
  margin-right: 16px;
}

.top-nav a:hover {
  text-decoration: underline;
}

h1 {
  margin-bottom: 24px;
}

.example-card {
  background: white;
  border: 1px solid #ddd0bf;
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 20px;
}

.example-label {
  font-size: 14px;
  font-weight: bold;
  color: #8a7363;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.example-copy {
  margin-bottom: 16px;
  color: #6f6254;
}

.code-block {
  margin-top: 16px;
  padding: 16px;
  background: #2a2622;
  color: #f8f4ee;
  border-radius: 12px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
}

.demo-flex,
.exercise-flex {
  padding: 16px;
  background: #fbf6ef;
  border: 2px dashed #d8cab8;
}

.exercise-flex {
  min-height: 400px;
}

.demo-item,
.exercise-card {
  background: #e8d5c0;
  color: #4a3624;
  border: 1px solid #d6b58a;
  border-radius: 16px;
  padding: 16px 20px;
}

.row-demo {
  display: flex;
  flex-direction: row;
}

.column-demo {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.justify-demo {
  display: flex;
  justify-content: space-between;
}

.align-demo {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 180px;
}

.small-item {
  height: 56px;
}

.medium-item {
  height: 96px;
}

.large-item {
  height: 140px;
}

.gap-demo {
  display: flex;
  gap: 24px;
}

.wrap-demo {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.grow-demo {
  display: flex;
  gap: 12px;
}

.grow-item {
  flex-grow: 1;
}

.ui-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 20px 24px;
  background: #fbf6ef;
  border: 1px solid #ddd0bf;
  border-radius: 16px;
}

.ui-nav {
  display: flex;
  gap: 16px;
  flex-grow: 1;
}

.ui-nav a {
  color: #7c3f00;
  text-decoration: none;
}

.brand {
  font-weight: bold;
}

.ui-button {
  border: none;
  border-radius: 999px;
  background: #7c3f00;
  color: white;
  padding: 10px 18px;
}

.responsive-flex-demo {
  display: flex;
  gap: 16px;
  min-height: auto;
}

.responsive-item {
  flex: 1;
}

@media (max-width: 700px) {
  .responsive-flex-demo {
    flex-direction: column;
  }
}