:root {
  --border: #cfcfcf;
  --link: #0645ad;
  --text: #222;
  --muted: #666;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.45;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: #111;
}

.top-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 14px;
}

.search {
  max-width: 280px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
}

.layout {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
}

.breadcrumb {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 14px;
}

h1 { font-size: 28px; margin: 0 0 18px; }
h2 { font-size: 22px; margin: 30px 0 12px; }

.converter {
  border: 1px solid var(--border);
  background: #fafafa;
  padding: 16px;
  max-width: 600px;
}

.row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr) 76px;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.row label { font-weight: 700; }

input[type='number'], input[type='text'], input[type='datetime-local'] {
  min-width: 0;
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  font-size: 16px;
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 10px 0 14px 160px;
}

button, .button-link {
  border: 1px solid #999;
  background: #eee;
  color: #111;
  padding: 8px 12px;
  font: inherit;
  cursor: pointer;
  display: inline-block;
}

.calculation { margin-top: 12px; color: #333; }

.formula {
  font-family: 'Courier New', monospace;
  background: #f7f7f7;
  border-left: 4px solid #ccc;
  padding: 10px 12px;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin-top: 12px;
}

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}

th { background: #eee; }

.category-block { margin-bottom: 26px; }

.sidebar-title {
  background: #ddd;
  border: 1px solid var(--border);
  padding: 8px 10px;
  font-weight: 700;
  font-size: 14px;
  text-transform: uppercase;
}

.sidebar-list {
  margin: 14px 0 24px;
  padding-left: 30px;
}

.sidebar-list li { margin: 0 0 12px; }

.note {
  color: var(--muted);
  font-size: 14px;
}

.footer {
  max-width: 1120px;
  margin: 20px auto 0;
  border-top: 1px solid var(--border);
  padding: 16px 18px 30px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .header-inner { align-items: stretch; flex-direction: column; }
  .top-nav { gap: 8px; }
  .search { max-width: none; }
  .row { grid-template-columns: 1fr; }
  .actions { margin-left: 0; }
}