:root {
  --bg: #f0f0f0;
  --paper: #ffffff;
  --paper-soft: #f7f9fb;
  --ink: #333333;
  --ink-strong: #1f496e;
  --muted: #707070;
  --line: #e6e6e6;
  --accent: #357ebd;
  --accent-dark: #1f496e;
  --accent-soft: #7eb0db;
  --success: #5ace24;
  --shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Lato", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

.shell {
  width: min(960px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header,
.site-footer {
  padding: 1.5rem 0;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: #fafafa;
}

.site-footer {
  color: var(--muted);
}

.brand {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand-subtitle {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.site-nav a {
  color: var(--ink-strong);
  font-weight: 700;
}

.site-header .shell,
.site-footer .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

main {
  padding: 3rem 0 4rem;
}

.hero,
.page-header {
  margin-bottom: 2rem;
}

.card-hero {
  background:
    linear-gradient(135deg, rgba(126, 176, 219, 0.18), rgba(255, 255, 255, 0) 50%),
    var(--paper);
}

.hero h1,
.page-header h1,
.article h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2.25rem, 5vw, 3.6rem);
  line-height: 1.05;
  color: var(--ink-strong);
}

.intro,
.page-copy,
.article .page-copy {
  max-width: 70ch;
}

.eyebrow,
.meta {
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.65rem 1rem;
  border-radius: 4px;
  font-weight: 700;
  transition: 0.2s ease;
}

.button-primary {
  background: var(--accent);
  color: #ffffff;
  border: 1px solid var(--accent);
}

.button-primary:hover {
  background: var(--accent-dark);
  color: #ffffff;
}

.button-secondary {
  background: #ffffff;
  color: var(--accent-dark);
  border: 1px solid var(--line);
}

.button-secondary:hover {
  background: var(--paper-soft);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  box-shadow: var(--shadow);
  padding: 1.5rem 1.75rem;
}

.card h2 {
  margin-top: 0;
  color: var(--ink-strong);
}

.note-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.note-list li + li {
  border-top: 1px solid var(--line);
  margin-top: 1rem;
  padding-top: 1rem;
}

.note-list a {
  font-size: 1.2rem;
  font-weight: 700;
}

.note-list span {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.note-list p,
.page-copy p,
.article p {
  margin-bottom: 1rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
}

.tags span {
  display: inline-flex;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent-soft);
  color: #ffffff;
  font-size: 0.85rem;
  padding: 0.2rem 0.7rem;
}

pre,
code {
  background: var(--paper-soft);
  border-radius: 4px;
}

code {
  padding: 0.1rem 0.3rem;
}

pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  padding: 1rem;
}

pre code {
  padding: 0;
  background: transparent;
}

.mini-list {
  margin: 0;
  padding-left: 1.2rem;
}

.mini-list li + li {
  margin-top: 0.5rem;
}

.page-copy h2,
.page-copy h3 {
  color: var(--ink-strong);
  margin-top: 1.75rem;
}

.page-copy blockquote {
  margin: 1.5rem 0;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--accent);
  background: var(--paper-soft);
}

.article-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-weight: 700;
}

@media (max-width: 640px) {
  .site-header .shell,
  .site-footer .shell {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    padding-top: 2rem;
  }

  .card {
    padding: 1.25rem;
  }
}