:root {
  color-scheme: light;
  --bg: #f3f4f6;
  --panel: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --line: #9ca3af;
  --accent: #2563eb;
  --accent-dark: #1e40af;
  --ok: #166534;
  --warn: #991b1b;
}

* {
  box-sizing: border-box;
}

html {
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  font-size: 17px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent-dark);
}

.top {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: #e5e7eb;
}

.top img {
  width: 48px;
  height: 48px;
}

.brand h1 {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1.1;
}

.brand p {
  margin: 3px 0 0;
  color: var(--muted);
}

.shell {
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
  min-height: calc(100vh - 73px);
}

.nav-toggle {
  display: none;
}

.side {
  border-right: 1px solid var(--line);
  background: #eceff3;
  padding: 10px;
}

.side nav {
  position: sticky;
  top: 8px;
  display: grid;
  gap: 6px;
}

.side a {
  display: block;
  padding: 8px 10px;
  border: 1px solid #b8c0cc;
  background: #f9fafb;
  color: var(--text);
  text-decoration: none;
}

.side a[aria-current="page"],
.side a:hover {
  border-color: var(--accent);
  background: #dbeafe;
}

main {
  padding: 16px 18px 28px;
  min-width: 0;
}

.hero,
.band,
.note {
  max-width: 1120px;
}

.hero {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.hero h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 12px;
  border-radius: 6px;
}

.card h3,
.band h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.button {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--accent-dark);
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
}

.button.secondary {
  background: #f9fafb;
  color: var(--text);
  border-color: var(--line);
}

.note {
  border-left: 5px solid var(--accent);
  background: #eff6ff;
  padding: 10px 12px;
  margin: 14px 0;
}

.warning {
  border-left-color: var(--warn);
  background: #fef2f2;
}

.ok {
  border-left-color: var(--ok);
  background: #f0fdf4;
}

table {
  border-collapse: collapse;
  margin: 12px 0;
  background: #fff;
  max-width: 100%;
}

th,
td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

th {
  background: #e5e7eb;
  cursor: pointer;
}

td.num,
th.num {
  text-align: right;
}

.screenshot {
  max-width: min(100%, 980px);
  height: auto;
  border: 1px solid var(--line);
  background: #fff;
}

footer {
  margin-top: 24px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 820px) {
  .shell {
    display: block;
  }

  .nav-toggle {
    display: block;
    width: 100%;
    padding: 8px 10px;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: #d1d5db;
    text-align: left;
    font: inherit;
  }

  .side {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  body.nav-closed .side {
    display: none;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}