@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700;800&display=swap');

:root {
  --bg: #f5f8ff;
  --surface: #ffffff;
  --line: #d5deec;
  --text: #0e1a2f;
  --muted: #516483;
  --accent: #32b89e;
  --brand: #2f60df;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 400;
  font-variant-ligatures: none;
  font-feature-settings: 'liga' 0, 'calt' 0;
}

body {
  color: var(--text);
  background: radial-gradient(90rem 48rem at -14% -20%, rgba(74, 120, 255, 0.16), transparent 62%),
    radial-gradient(80rem 44rem at 112% -18%, rgba(50, 184, 158, 0.12), transparent 60%), var(--bg);
}

.article-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.84rem 1rem;
}

.brand {
  color: var(--text);
  font-weight: 800;
  font-size: 1.05rem;
}

.brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: #456184;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 8px;
  padding: 0.36rem 0.56rem;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: #ecf2ff;
  color: #274166;
}

main {
  max-width: 900px;
  margin: 1rem auto 1.4rem;
  padding: 0 1rem;
}

article {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(10px);
  padding: 1rem;
}

.kicker {
  margin: 0;
  font-size: 0.72rem;
  color: #617b99;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

h1 {
  margin: 0.4rem 0 0.45rem;
  font-size: clamp(1.45rem, 3.5vw, 2.2rem);
  line-height: 1.2;
}

.gradient-heading {
  background: linear-gradient(120deg, #1a2f58 0%, #2f60df 45%, #2fbfa5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.intro {
  margin: 0.82rem 0 0;
  color: #243d5c;
  font-size: 0.88rem;
  line-height: 1.62;
}

section {
  margin-top: 0.95rem;
}

h2 {
  margin: 0 0 0.4rem;
  font-size: 0.96rem;
}

p {
  margin: 0 0 0.55rem;
  color: #243d5c;
  font-size: 0.86rem;
  line-height: 1.58;
}

ul {
  margin: 0;
  padding-left: 1.1rem;
}

li {
  margin-bottom: 0.45rem;
  color: #243d5c;
  font-size: 0.85rem;
  line-height: 1.52;
}

.word-list {
  margin-top: 0.52rem;
  display: grid;
  gap: 0.48rem;
}

.word-item {
  border: 1px solid #ced9ef;
  border-radius: 10px;
  padding: 0.58rem;
  background: #f1f6ff;
  font-size: 0.84rem;
  line-height: 1.5;
}

.word-item strong {
  color: #264f91;
}

.article-footer {
  margin-top: 1rem;
  padding-top: 0.76rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.82rem;
}

.article-footer a {
  text-decoration: none;
  color: var(--brand);
  font-weight: 700;
}

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

@media (max-width: 760px) {
  .article-header {
    flex-direction: column;
    align-items: flex-start;
  }
}