:root {
  color-scheme: light;
  --page-bg: #f7f7f7;
  --card-bg: #fbfbfb;
  --card-border: #ececec;
  --text-main: #2f2f2f;
  --text-muted: #3d3d3d;
  --heading-main: #1f1f1f;
  --heading-sub: #262626;
  --link-color: #39556f;
  --shadow-soft: 0 8px 24px rgba(17, 24, 39, 0.06);
  --radius-lg: 8px;
  --content-width: 50rem;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  margin: 0 auto;
  min-height: 100vh;
  max-width: 820px;
  padding: 40px 20px;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-main);
  background: var(--page-bg);
}

main {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 48px 40px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

main > *:first-child {
  margin-top: 0;
}

main > *:last-child {
  margin-bottom: 0;
}

.site-logo {
  display: inline-block;
  margin-bottom: 0;
}

.site-logo img {
  max-width: 140px;
  height: auto;
  margin-bottom: 24px;
}

h1,
h2,
p,
ul,
ol,
blockquote {
  max-width: 42rem;
}

h1,
h2,
h3 {
  margin-top: 0;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(2.5rem, 6vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.5px;
  font-weight: 700;
  color: var(--heading-main);
}

h2 {
  margin-top: 3rem;
  margin-bottom: 0.85rem;
  font-size: clamp(1.4rem, 2.8vw, 1.95rem);
  color: var(--heading-sub);
}

p,
ul,
ol,
blockquote {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  color: var(--text-muted);
}

p + p,
ul + p,
ol + p,
p + ul,
p + ol {
  margin-top: 1rem;
}

ul,
ol {
  padding-left: 1.4rem;
}

li + li {
  margin-top: 0.55rem;
}

strong {
  color: var(--text-main);
}

a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 500;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

nav p {
  margin-bottom: 1.25rem;
}

nav a {
  font-size: 0.92rem;
  opacity: 0.78;
}

nav a:hover,
nav a:focus-visible {
  opacity: 1;
}

blockquote {
  margin-left: 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid #dcdcdc;
  background: #f5f5f5;
  border-radius: 0 8px 8px 0;
}

@media (max-width: 640px) {
  body {
    padding: 24px 16px;
  }

  main {
    padding: 32px 20px;
  }

  h2 {
    margin-top: 2.4rem;
  }
}