:root[data-theme='light'] {
  --bg: #f5f7fb;
  --bg-alt: #edf2fb;
  --card: #ffffff;
  --card-border: #d5dbe8;
  --text: #0b132b;
  --text-secondary: #1f2a44;
  --muted: #5c6883;
  --accent: #557fa6;
  --primary: #7b205c;
  --shadow: 0 14px 40px rgba(17,34,68,0.08);
}
:root[data-theme='dark'] {
  --bg: #0b132b;
  --bg-alt: #0e152a;
  --card: #1c2541;
  --card-border: rgba(255,255,255,0.08);
  --text: #ffffff;
  --text-secondary: #e0fbfc;
  --muted: #6b7a99;
  --accent: #98c1d9;
  --primary: #5f0f40;
  --shadow: 0 14px 40px rgba(0,0,0,0.28);
}

:root {
  color-scheme: light;
}
:root[data-theme='dark'] {
  color-scheme: dark;
}
* {
  box-sizing: border-box;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  background: radial-gradient(circle at 10% 10%, var(--bg-alt), var(--bg));
  color: var(--text);
}
.page {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px 40px;
}
.card {
  width: min(880px, 100%);
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 28px 32px 32px;
}
header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
  gap: 12px;
}
h1 {
  font-size: 26px;
  letter-spacing: 0.2px;
  margin: 0;
  color: var(--text-secondary);
}
h2 {
  font-size: 20px;
  margin: 28px 0 10px;
  color: var(--accent);
}
p,
ul {
  margin: 0 0 14px;
  line-height: 1.6;
  color: var(--text);
}
ul {
  padding-left: 20px;
}
li {
  margin-bottom: 6px;
  color: var(--text-secondary);
}
.header-wrap{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  white-space: nowrap;
}
.meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  background: var(--bg-alt);
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
}
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--card-border);
  background: var(--bg-alt);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.2px;
  transition: transform 120ms ease, opacity 120ms ease;
  text-decoration: none;
  user-select: none;
}
.toggle:hover {
  transform: translateY(-1px);
}
.toggle:active {
  transform: translateY(0);
  opacity: 0.92;
}
footer {
  margin-top: 26px;
  font-size: 13px;
  color: var(--muted);
}
a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}