:root {
  --page-bg: #e8e8e8;
  --paper: #ffffff;
  --ink: #111111;
  --muted: #555555;
  --border: #c8c8c8;
  --soft-border: #dddddd;
  --link: #436976;
  --link-hover: #d30;
  --heading-bg: #f5f5f5;
  --code-bg: #eeeeee;
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  padding: 0;
  background: var(--page-bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  line-height: 1.55;
}

.page {
  width: min(980px, calc(100% - 24px));
  margin: 18px auto 28px;
  background: var(--paper);
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.site-header {
  padding: 16px 22px 10px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(#ffffff, #f0f0f0);
}

.site-title {
  margin: 0;
  font-size: 1.9rem;
  font-weight: normal;
  line-height: 1.2;
}

.site-title a {
  color: #222;
  text-decoration: none;
}

.site-subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 0 22px;
  border-bottom: 1px solid var(--border);
  background: #f7f7f7;
}

.tabs a {
  display: inline-block;
  padding: 7px 12px;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  color: var(--link);
  text-decoration: none;
  font-size: 0.95rem;
}

.tabs a:hover,
.tabs a.active {
  background: #fff;
  border-left-color: var(--border);
  border-right-color: var(--border);
  color: var(--ink);
}

.content {
  padding: 18px 24px 28px;
}

.content-nav {
  float: right;
  width: 230px;
  margin: 0 0 18px 24px;
  padding: 10px 12px;
  border: 1px solid var(--soft-border);
  background: #fafafa;
  font-size: 0.92rem;
}

.content-nav strong {
  display: block;
  margin-bottom: 5px;
}

.content-nav ul {
  margin: 0;
  padding-left: 18px;
}

h1, h2, h3, h4 {
  clear: left;
  font-weight: normal;
  line-height: 1.25;
  color: #222;
}

h1 {
  margin: 0 0 16px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  font-size: 1.8rem;
}

h2 {
  margin: 24px 0 10px;
  padding: 4px 8px;
  border: 1px solid var(--soft-border);
  background: var(--heading-bg);
  font-size: 1.35rem;
}

h3 {
  margin: 18px 0 8px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--soft-border);
  font-size: 1.15rem;
}

h4 {
  margin: 14px 0 6px;
  font-size: 1rem;
  font-weight: bold;
}

p { margin: 0 0 0.9em; }

a {
  color: var(--link);
  text-decoration: underline;
}

a:hover { color: var(--link-hover); }

ul, ol { margin-top: 0.4em; margin-bottom: 1em; }

.download-list {
  margin: 0.4em 0 1.2em;
  padding-left: 24px;
}

.download-list li { margin: 0.35em 0; }

.note {
  padding: 8px 10px;
  border: 1px solid #e6d7a7;
  background: #fff9df;
  color: #4b432a;
}

.steps {
  margin: 0.8em 0 1.2em;
  padding-left: 24px;
}

.steps li { margin-bottom: 0.45em; }

.path {
  display: inline-block;
  padding: 1px 5px;
  border: 1px solid #d4d4d4;
  background: var(--code-bg);
  font-family: Consolas, Monaco, monospace;
  font-size: 0.92em;
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 1px 5px;
  border: 1px solid #aaa;
  border-radius: 3px;
  background: #f8f8f8;
  box-shadow: inset 0 -1px 0 #ccc;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92em;
  text-align: center;
}

.layout-block {
  margin: 16px 0 24px;
}

.layout-block img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 8px 0 4px;
  border: 1px solid var(--border);
  background: #fff;
}

.footer {
  clear: both;
  padding: 10px 22px 14px;
  border-top: 1px solid var(--border);
  background: #f7f7f7;
  color: var(--muted);
  font-size: 0.86rem;
}

@media (max-width: 760px) {
  .page { width: calc(100% - 12px); margin-top: 6px; }
  .site-header, .content, .footer { padding-left: 14px; padding-right: 14px; }
  .tabs { padding-left: 14px; padding-right: 14px; }
  .content-nav { float: none; width: auto; margin: 0 0 18px; }
  .site-title { font-size: 1.45rem; }
}