:root {
  --blue-900: #042C53;
  --blue-700: #0C447C;
  --blue-600: #185FA5;
  --blue-500: #2478C8;
  --blue-400: #378ADD;
  --blue-200: #b5d4f4;
  --blue-100: #E6F1FB;
  --blue-50: #F3F8FD;
  --ink: #1a2733;
  --ink-soft: #4d5d6d;
  --ink-faint: #7d8a96;
  --bg: #ffffff;
  --line: #dfe9f2;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
header {
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.nav { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.brand {
  font-size: 17px; font-weight: 700;
  color: var(--blue-700); text-decoration: none;
  letter-spacing: -0.01em;
}
.brand span { color: var(--blue-400); font-weight: 500; }
nav a {
  color: var(--ink-soft); text-decoration: none;
  font-size: 14px; font-weight: 500; margin-left: 26px;
  transition: color 0.15s;
}
nav a:hover, nav a.active { color: var(--blue-600); }
.hero {
  background: linear-gradient(180deg, var(--blue-50) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}
.hero-inner { padding: 96px 0 84px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue-100); color: var(--blue-700);
  font-size: 13px; font-weight: 600;
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 28px;
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: #1D9E75; }
h1 {
  font-size: clamp(32px, 5vw, 50px);
  font-weight: 700; line-height: 1.12;
  letter-spacing: -0.025em;
  max-width: 720px; color: var(--blue-900);
}
h1 em { font-style: normal; color: var(--blue-500); }
.hero p.sub {
  margin-top: 24px; font-size: 18px;
  color: var(--ink-soft); max-width: 600px;
}
.cta-row { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none;
  font-size: 15px; font-weight: 600;
  padding: 13px 26px; border-radius: 8px;
  transition: all 0.15s;
}
.btn-primary { background: var(--blue-600); color: #fff; }
.btn-primary:hover { background: var(--blue-700); }
.btn-ghost { color: var(--blue-700); border: 1.5px solid var(--blue-200); background: #fff; }
.btn-ghost:hover { background: var(--blue-50); }
section { padding: 80px 0; }
section + section { border-top: 1px solid var(--line); }
.sec-label {
  font-size: 13px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--blue-500); margin-bottom: 10px;
}
h2 {
  font-size: 30px; font-weight: 700;
  letter-spacing: -0.02em; margin-bottom: 32px;
  color: var(--blue-900);
}
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
.about-grid p { color: var(--ink-soft); margin-bottom: 16px; }
.about-grid strong { color: var(--ink); font-weight: 600; }
.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.focus-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 30px 26px;
  transition: border-color 0.15s, transform 0.15s;
}
.focus-card:hover { border-color: var(--blue-400); transform: translateY(-2px); }
.focus-icon {
  width: 46px; height: 46px; border-radius: 10px;
  background: var(--blue-100);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.focus-icon svg { width: 24px; height: 24px; stroke: var(--blue-600); }
.focus-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: var(--blue-900); }
.focus-card p { font-size: 14.5px; color: var(--ink-soft); }
footer { border-top: 1px solid var(--line); background: var(--blue-50); padding: 44px 0 56px; }
.foot-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
.foot-links a {
  color: var(--blue-700); text-decoration: none;
  font-size: 14px; font-weight: 500; margin-right: 24px;
}
.foot-links a:hover { text-decoration: underline; }
.foot-note { font-size: 13px; color: var(--ink-faint); }

/* Article cards / listing */
.article-list { display: flex; flex-direction: column; gap: 18px; }
.article-card {
  display: block; text-decoration: none;
  background: #fff; border: 1px solid var(--line);
  border-radius: 12px; padding: 26px 28px;
  transition: border-color 0.15s, transform 0.15s;
}
.article-card:hover { border-color: var(--blue-400); transform: translateY(-2px); }
.article-card .meta { font-size: 13px; color: var(--ink-faint); margin-bottom: 6px; }
.article-card .meta .tag {
  display: inline-block; background: var(--blue-100); color: var(--blue-700);
  font-size: 12px; font-weight: 600; padding: 2px 10px;
  border-radius: 999px; margin-right: 8px;
}
.article-card h3 { font-size: 20px; font-weight: 600; color: var(--blue-900); margin-bottom: 8px; }
.article-card p { font-size: 15px; color: var(--ink-soft); }
.article-card .read { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 600; color: var(--blue-600); }

/* Article page */
.article-hero { border-bottom: 1px solid var(--line); background: var(--blue-50); }
.article-hero-inner { padding: 64px 0 48px; max-width: 760px; margin: 0 auto; }
.article-hero .meta { font-size: 14px; color: var(--ink-faint); margin-bottom: 14px; }
.article-hero h1 { font-size: clamp(28px, 4vw, 40px); }
.article-hero p.lede { margin-top: 18px; font-size: 18px; color: var(--ink-soft); }
.prose { max-width: 760px; margin: 0 auto; padding: 56px 0 80px; }
.prose h2 { font-size: 24px; margin: 40px 0 16px; }
.prose h3 { font-size: 19px; font-weight: 600; color: var(--blue-900); margin: 30px 0 12px; }
.prose p { margin-bottom: 18px; color: var(--ink); }
.prose ul, .prose ol { margin: 0 0 18px 24px; color: var(--ink); }
.prose li { margin-bottom: 8px; }
.prose a { color: var(--blue-600); }
.prose img { max-width: 100%; border-radius: 12px; border: 1px solid var(--line); margin: 8px 0 18px; }
.prose figcaption { font-size: 13px; color: var(--ink-faint); text-align: center; margin: -10px 0 18px; }
.prose blockquote {
  border-left: 3px solid var(--blue-400); background: var(--blue-50);
  padding: 14px 20px; border-radius: 0 8px 8px 0; margin-bottom: 18px;
  color: var(--ink-soft);
}
.prose pre {
  background: #0d1b2a; color: #d6e4f0; font-size: 13.5px;
  padding: 18px 20px; border-radius: 10px; overflow-x: auto;
  margin-bottom: 18px; line-height: 1.55;
}
.prose code { font-family: ui-monospace, 'Cascadia Code', Consolas, monospace; }
.prose p code, .prose li code {
  background: var(--blue-100); color: var(--blue-700);
  padding: 1px 6px; border-radius: 4px; font-size: 14px;
}
.article-footer {
  max-width: 760px; margin: 0 auto; padding: 0 0 72px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px;
}
.back-link { font-size: 14.5px; font-weight: 600; color: var(--blue-600); text-decoration: none; }
.back-link:hover { text-decoration: underline; }

/* Newsletter */
.newsletter-box {
  background: var(--blue-700); border-radius: 16px;
  padding: 48px 44px; color: #fff;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 24px;
}
.newsletter-box h3 { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.newsletter-box p { font-size: 15px; color: var(--blue-100); max-width: 420px; }
.newsletter-form { display: flex; gap: 10px; flex-wrap: wrap; }
.newsletter-form input[type="email"] {
  font-family: inherit; font-size: 15px;
  padding: 12px 16px; border-radius: 8px; border: none;
  min-width: 240px;
}
.newsletter-form button {
  font-family: inherit; font-size: 15px; font-weight: 600;
  background: var(--blue-400); color: #fff;
  border: none; border-radius: 8px; padding: 12px 22px; cursor: pointer;
}
.newsletter-form button:hover { background: var(--blue-500); }

@media (max-width: 700px) {
  .about-grid { grid-template-columns: 1fr; gap: 8px; }
  nav a { margin-left: 14px; font-size: 13px; }
  .hero-inner { padding: 64px 0 56px; }
  section { padding: 56px 0; }
  .newsletter-box { padding: 32px 24px; }
}