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

:root {
  --navy-950: #060A12;
  --navy-900: #0B111D;
  --navy-800: #131C2E;
  --navy-700: #243044;
  --navy-600: #38507A;
  --navy-500: #5878AE;
  --navy-400: #8AA6D4;
  --navy-100: #E8EEF6;
  --navy-50: #F4F7FB;

  --accent-600: #0A6FC2;
  --accent-500: #1488E0;
  --accent-400: #4FA8EC;

  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;

  --hairline: rgb(13 23 42 / 0.08);
  --hairline-strong: rgb(13 23 42 / 0.14);

  --font-heading: "Plus Jakarta Sans", sans-serif;
  --font-body: Inter, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --shadow-card: 0 1px 3px rgb(11 17 29 / 0.04), 0 6px 20px -6px rgb(11 17 29 / 0.07);
  --shadow-card-hover: 0 10px 34px -8px rgb(11 17 29 / 0.14), 0 2px 6px rgb(11 17 29 / 0.05);
  --shadow-subtle: 0 1px 2px rgb(11 17 29 / 0.04), 0 1px 1px rgb(11 17 29 / 0.03);
  --shadow-glow: 0 0 0 1px rgb(20 136 224 / 0.18), 0 12px 36px -10px rgb(20 136 224 / 0.28);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--slate-600);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--navy-900);
  letter-spacing: -0.02em;
  margin: 0;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

::selection { background-color: rgb(20 136 224 / 0.18); color: var(--navy-900); }

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
.wrap-narrow { max-width: 780px; margin: 0 auto; padding: 0 1.5rem; }

/* Eyebrow */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent-600);
}
.eyebrow::before {
  content: '';
  display: inline-block;
  height: 1px;
  width: 1.5rem;
  background: rgb(10 111 194 / 0.5);
}
.eyebrow.light { color: var(--accent-400); }
.eyebrow.light::before { background: rgb(79 168 236 / 0.6); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #fff;
  border-bottom: 1px solid var(--hairline);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.65rem; }
.brand img { height: 2rem; width: 2rem; border-radius: 0.5rem; object-fit: cover; }
.brand-name { font-family: var(--font-heading); font-weight: 700; color: var(--navy-900); font-size: 1.125rem; letter-spacing: -0.01em; }

.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.site-nav a {
  padding: 0.5rem 0.875rem;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--slate-600);
  border-radius: 0.375rem;
  transition: color 0.15s;
}
.site-nav a:hover { color: var(--navy-900); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  border-radius: 0.5rem;
  letter-spacing: -0.01em;
  transition: all 0.2s;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent-500);
  color: #fff;
  box-shadow: var(--shadow-subtle);
}
.btn-primary:hover { background: var(--accent-600); box-shadow: var(--shadow-glow); }
.btn-secondary {
  border-color: var(--hairline-strong);
  color: var(--navy-900);
}
.btn-secondary:hover { background: var(--navy-900); color: #fff; border-color: var(--navy-900); }

/* Hero */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--navy-50);
  border-bottom: 1px solid var(--hairline);
  background-image:
    linear-gradient(to right, rgb(13 23 42 / 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(13 23 42 / 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -10rem;
  right: 0;
  height: 460px;
  width: 460px;
  border-radius: 9999px;
  background: rgb(20 136 224 / 0.10);
  filter: blur(64px);
  pointer-events: none;
}
.page-hero-inner { position: relative; padding: 7rem 0 4.5rem; }
.page-hero-inner.narrow { max-width: 780px; margin: 0 auto; padding-left: 1.5rem; padding-right: 1.5rem; }
.page-hero-top { margin-bottom: 2rem; }
.page-hero-top a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--slate-400);
}
.page-hero-top a:hover { color: var(--navy-900); }
.page-hero-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.page-hero h1 {
  max-width: 46rem;
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-top: 1.25rem;
}
.page-hero p.lead {
  margin-top: 1.25rem;
  max-width: 38rem;
  font-size: 1.125rem;
  color: var(--slate-600);
  line-height: 1.6;
}
@media (min-width: 1024px) {
  .page-hero-inner { padding: 9rem 0 5rem; }
  .page-hero h1 { font-size: 3.5rem; }
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  background: #EAF4FD;
  color: var(--accent-600);
  box-shadow: inset 0 0 0 1px rgb(10 111 194 / 0.15);
}

.meta-mono {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-400);
}

/* Post grid / cards */
.section { padding: 4.5rem 0; }
.post-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1.5rem;
}
@media (min-width: 768px) { .post-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .post-grid { grid-template-columns: repeat(3, 1fr); } }

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: 0.75rem;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 0.3s, border-color 0.3s;
}
.post-card:hover { box-shadow: var(--shadow-card-hover); border-color: var(--hairline-strong); }
.post-card-image { aspect-ratio: 16/9; overflow: hidden; border-bottom: 1px solid var(--hairline); background: #F6F7FB; }
.post-card-image img { height: 100%; width: 100%; object-fit: contain; transition: transform 0.5s; }
.post-card:hover .post-card-image img { transform: scale(1.03); }
.post-card-body { padding: 1.5rem; display: flex; flex-direction: column; flex: 1; }
.post-card-tags { display: flex; align-items: center; gap: 0.65rem; margin-bottom: 0.75rem; }
.post-card h2 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  flex: 1;
}
.post-card:hover h2 { color: var(--accent-600); }
.post-card p.excerpt {
  font-size: 0.875rem;
  color: var(--slate-500);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card-footer {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.post-card-read {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-600);
}

/* Article body */
.article-wrap { background: #fff; padding: 4rem 0 6rem; }
.article-hero-image {
  margin-bottom: 3rem;
  border-radius: 0.75rem;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.gh-content {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--slate-600);
}
.gh-content h1, .gh-content h2, .gh-content h3, .gh-content h4 {
  font-family: var(--font-heading);
  color: var(--navy-900);
  letter-spacing: -0.01em;
  margin-top: 2.25em;
  margin-bottom: 0.6em;
}
.gh-content h2 { font-size: 1.5em; font-weight: 700; }
.gh-content h3 { font-size: 1.25em; font-weight: 700; }
.gh-content p { margin: 1.25em 0; }
.gh-content a { color: var(--accent-600); text-decoration: none; }
.gh-content a:hover { text-decoration: underline; }
.gh-content strong { color: var(--navy-900); font-weight: 600; }
.gh-content img {
  border-radius: 0.75rem;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  margin: 2em auto;
}
.gh-content blockquote {
  margin: 2em 0;
  padding: 0.25em 0 0.25em 1.5em;
  border-left: 3px solid var(--accent-500);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.2em;
  color: var(--navy-900);
  font-style: normal;
}
.gh-content ul, .gh-content ol { padding-left: 1.4em; margin: 1.25em 0; }
.gh-content li { margin: 0.5em 0; }
.gh-content code {
  font-family: var(--font-mono);
  background: var(--navy-50);
  padding: 0.15em 0.4em;
  border-radius: 0.3em;
  font-size: 0.88em;
}
.gh-content pre {
  background: var(--navy-900);
  color: #E8EEF6;
  padding: 1.25em;
  border-radius: 0.6em;
  overflow-x: auto;
}
.gh-content pre code { background: none; padding: 0; color: inherit; }
.gh-content figcaption {
  text-align: center;
  font-size: 0.85em;
  color: var(--slate-400);
  margin-top: -1.25em;
  margin-bottom: 2em;
}
.gh-content hr { border: none; border-top: 1px solid var(--hairline); margin: 3em 0; }

/* Koenig editor wide/full image cards break out of the narrow article column. */
.kg-width-wide {
  margin-left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 1200px;
}
.kg-width-full {
  margin-left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 100vw;
}
.kg-width-full img { border-radius: 0; border: none; box-shadow: none; }

/* Course lesson layout */
.course-lesson-grid { display: block; }
.course-sidebar { display: none; margin-bottom: 2rem; }
@media (min-width: 1024px) {
  .course-lesson-grid { display: grid; grid-template-columns: 220px 1fr; gap: 3rem; align-items: start; }
  .course-sidebar { display: block; position: sticky; top: 6rem; margin-bottom: 0; }
}

/* Footer */
.site-footer {
  position: relative;
  background: var(--navy-50);
  border-top: 1px solid var(--hairline);
  padding: 4rem 0;
}
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; }
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.footer-blurb { font-size: 0.875rem; line-height: 1.6; color: var(--slate-600); max-width: 20rem; margin-top: 1.25rem; }
.footer-social { display: flex; gap: 0.65rem; margin-top: 1.5rem; }
.footer-social a {
  display: grid;
  place-items: center;
  height: 2.25rem;
  width: 2.25rem;
  border-radius: 0.5rem;
  background: #fff;
  border: 1px solid var(--hairline);
  color: var(--slate-500);
}
.footer-social a:hover { color: var(--navy-900); border-color: var(--hairline-strong); }
.footer-heading {
  color: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 1rem;
}
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.footer-links a { font-size: 0.875rem; }
.footer-links a:hover { color: var(--navy-900); }
.footer-bottom {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--slate-500);
}
@media (min-width: 640px) { .footer-bottom { flex-direction: row; align-items: center; } }
.footer-bottom-links { display: flex; gap: 1.5rem; }
.footer-bottom-links a:hover { color: var(--navy-900); }