:root {
  color-scheme: light dark;
  --canvas: #f6f4fe;
  --card: #ffffff;
  --ink: #1c1830;
  --muted: #5f586e;
  --border: #ded9ec;
  --accent: #6d4aff;
  --accent-strong: #5636c8;
  --accent-tint: #eae4ff;
  --code: #eeeaf8;
  --shadow: 0 10px 30px rgba(66, 43, 126, 0.10);
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--canvas);
}

body {
  max-width: 800px;
  margin: 0 auto;
  padding: 36px 22px 72px;
  color: var(--ink);
  background: transparent;
  font: 16px/1.72 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  text-wrap: pretty;
}

h1, h2, h3 {
  line-height: 1.24;
  text-wrap: balance;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 3rem);
  letter-spacing: -0.035em;
}

h2 {
  margin-top: 2.3em;
  padding-bottom: .38em;
  border-bottom: 2px solid var(--accent-tint);
  font-size: 1.28rem;
}

h3 {
  margin-top: 1.65em;
  font-size: 1.06rem;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: .08em;
  text-underline-offset: .16em;
}

a:visited { color: var(--accent-strong); }
a:hover { color: var(--accent); }

a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 3px;
  border-radius: 6px;
}

hr {
  margin: 2.6em 0;
  border: 0;
  border-top: 1px solid var(--border);
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--code);
  font-size: .92em;
}

ul { padding-left: 1.35em; }
li + li { margin-top: .42em; }

.meta {
  color: var(--muted);
  font-size: .95rem;
}

.card {
  margin: 22px 0;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.btn {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
  padding: 9px 18px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff !important;
  font-weight: 650;
  text-decoration: none;
  box-shadow: 0 6px 16px rgba(86, 54, 200, .20);
}

.btn:hover { background: var(--accent-strong); }

::selection {
  color: var(--ink);
  background: var(--accent-tint);
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #15121c;
    --card: #1e1a28;
    --ink: #f2effa;
    --muted: #b2adbf;
    --border: #3a334a;
    --accent: #8b6dff;
    --accent-strong: #a992ff;
    --accent-tint: #33275a;
    --code: #292333;
    --shadow: 0 12px 32px rgba(0, 0, 0, .25);
  }
}

@media (max-width: 520px) {
  body { padding: 24px 18px 56px; }
  .card { padding: 18px; border-radius: 16px; }
}

@media (prefers-reduced-motion: no-preference) {
  a, .btn { transition: color .18s ease, background-color .18s ease, transform .18s ease; }
  .btn:hover { transform: translateY(-1px); }
}