:root {
  --bg: #f6f8fb;
  --surface: #fff;
  --text: #101828;
  --muted: #5c667a;
  --line: #dde3ee;
  --accent: #0b5cff;
  --accent-2: #00a4ef;
  --code: #0d1424;
  --shadow: 0 18px 50px rgba(17, 35, 70, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: auto;
}

a {
  color: inherit;
}

/* Header */

.site-header {
  background: rgba(246, 248, 251, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-wrap {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 8px 22px rgba(11, 92, 255, 0.25);
}

.site-nav {
  display: flex;
  gap: 25px;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 650;
  font-size: 0.94rem;
}

.site-nav a:hover {
  color: var(--accent);
}

/* Homepage */

.hero {
  padding: 92px 0 80px;
  background:
    radial-gradient(circle at 90% 10%, rgba(0, 164, 239, 0.14), transparent 27%),
    radial-gradient(circle at 8% 20%, rgba(11, 92, 255, 0.11), transparent 30%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  gap: 70px;
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.17em;
  font-weight: 800;
  font-size: 0.74rem;
  color: var(--accent);
  margin-bottom: 17px;
}

.hero h1 {
  font-size: clamp(2.65rem, 6vw, 5.35rem);
  line-height: 0.99;
  letter-spacing: -0.065em;
  margin: 0;
  max-width: 850px;
}

.hero h1 span {
  color: var(--accent);
}

.hero-copy {
  font-size: 1.18rem;
  color: var(--muted);
  max-width: 720px;
  margin: 29px 0;
}

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topic-list span {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 13px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.85rem;
}

.lab-card {
  background: var(--code);
  color: #e7edf8;
  border: 1px solid #23304b;
  border-radius: 22px;
  padding: 23px;
  box-shadow: var(--shadow);
  transform: rotate(1deg);
}

.status {
  font-size: 0.73rem;
  letter-spacing: 0.12em;
  font-weight: 800;
  color: #9eabc3;
  border-bottom: 1px solid #25314a;
  padding-bottom: 15px;
}

.status span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: #37db8a;
  border-radius: 50%;
  box-shadow: 0 0 15px #37db8a;
  margin-right: 8px;
}

.terminal {
  font: 500 0.9rem/1.8 ui-monospace, SFMono-Regular, Consolas, monospace;
  padding: 15px 4px 2px;
}

.terminal b {
  color: #4fa3ff;
}

.terminal p {
  margin: 4px 0;
}

.terminal .muted {
  color: #8290aa;
}

.terminal .success {
  color: #37db8a;
}

/* Homepage sections */

.section {
  padding: 80px 0 100px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section-heading h2 {
  font-size: 2.2rem;
  letter-spacing: -0.045em;
  margin: 0;
}

.section-heading .eyebrow {
  margin-bottom: 5px;
}

.section-heading > a {
  color: var(--accent);
  font-weight: 700;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 23px;
}

.post-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 29px;
  box-shadow: 0 8px 30px rgba(17, 35, 70, 0.045);
  transition: 0.2s ease;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.post-card-top {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.post-card-top span {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.post-card h3 {
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 22px 0 13px;
}

.post-card h3 a {
  text-decoration: none;
}

.post-card p {
  color: var(--muted);
}

.read-more {
  display: inline-flex;
  gap: 8px;
  color: var(--accent);
  font-weight: 800;
  text-decoration: none;
  margin-top: 8px;
}

.empty-state {
  color: var(--muted);
}

/* Article layout */

.page-content,
.post {
  padding-top: 75px;
  padding-bottom: 100px;
}

.post.container {
  width: min(840px, calc(100% - 40px));
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
}

.prose {
  width: 100%;
  max-width: 840px;
  min-width: 0;
}

.post-header {
  margin-bottom: 50px;
}

.post-header h1,
.prose h1 {
  font-size: clamp(2.35rem, 5vw, 4.25rem);
  line-height: 1.06;
  letter-spacing: -0.055em;
  margin: 0;
}

.post-lead {
  font-size: 1.22rem;
  color: var(--muted);
  margin: 24px 0;
}

.post-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.91rem;
}

.prose h2 {
  font-size: 1.85rem;
  letter-spacing: -0.035em;
  margin: 2.5em 0 0.7em;
  border-top: 1px solid var(--line);
  padding-top: 1.1em;
}

.prose h3 {
  font-size: 1.3rem;
  margin-top: 2em;
}

.prose p,
.prose li {
  font-size: 1.02rem;
}

.prose a {
  color: var(--accent);
}

.prose blockquote {
  margin: 28px 0;
  padding: 16px 22px;
  border-left: 4px solid var(--accent);
  background: #eaf2ff;
  border-radius: 0 12px 12px 0;
}

/* Code */

.prose code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  background: #e8edf5;
  padding: 0.15em 0.38em;
  border-radius: 5px;
  font-size: 0.9em;
}

.prose pre {
  background: var(--code);
  color: #e7edf8;
  overflow-x: auto;
  max-width: 100%;
  border-radius: 15px;
  padding: 21px;
  border: 1px solid #23304b;
  box-shadow: 0 10px 28px rgba(13, 20, 36, 0.09);
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Tables */

.prose table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
}

/* Article images */

.prose img {
  display: block !important;
  width: auto !important;
  max-width: 600px !important;
  height: auto !important;
  margin: 2rem auto 0.75rem !important;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(17, 35, 70, 0.10);
}

.prose img + em {
  display: block;
  max-width: 600px;
  margin: 0 auto 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 42px 0;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 30px;
}

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

.site-footer p {
  margin: 5px 0;
}

.footer-right {
  display: flex;
  gap: 18px;
  align-items: center;
}

.footer-right a {
  color: var(--accent);
  font-weight: 700;
}

/* Dark mode */

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080d18;
    --surface: #0f1728;
    --text: #eef3fb;
    --muted: #9aa8be;
    --line: #253047;
    --accent: #69a7ff;
    --accent-2: #19baf5;
    --code: #050914;
    --shadow: 0 22px 55px rgba(0, 0, 0, 0.35);
  }

  .site-header {
    background: rgba(8, 13, 24, 0.87);
  }

  .prose blockquote {
    background: #101f38;
  }

  .prose code {
    background: #182238;
  }

  .topic-list span {
    background: #111a2d;
  }

  .prose img {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.32);
  }
}

/* Tablet */

@media (max-width: 820px) {
  .container {
    width: min(calc(100% - 28px), 1120px);
  }

  .post.container {
    width: min(calc(100% - 28px), 840px);
  }

  .hero {
    padding: 65px 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .lab-card {
    transform: none;
  }

  .posts-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    flex-direction: column;
  }

  .footer-right {
    flex-wrap: wrap;
  }

  .prose img {
    width: 100% !important;
    max-width: 600px !important;
  }
}

/* Mobile */

@media (max-width: 520px) {
  .nav-wrap {
    height: 65px;
  }

  .site-nav {
    gap: 14px;
  }

  .site-nav a:first-child {
    display: none;
  }

  .hero h1 {
    font-size: 2.65rem;
  }

  .hero-copy {
    font-size: 1.04rem;
  }

  .section {
    padding: 60px 0 75px;
  }

  .post-card {
    padding: 22px;
  }

  .page-content,
  .post {
    padding-top: 55px;
  }

  .post-header h1,
  .prose h1 {
    font-size: 2.4rem;
  }

  .footer-right {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }

  .prose img {
    width: 100% !important;
    max-width: 100% !important;
  }
}
/* ========================================
   Clickable article images
   ======================================== */

.article-image-link {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 2rem auto 0.75rem;
  cursor: zoom-in;
  text-decoration: none;
}

.article-image-link img {
  display: block !important;
  width: auto !important;
  max-width: 600px !important;
  height: auto !important;
  margin: 0 !important;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(17, 35, 70, 0.10);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.article-image-link:hover img {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(11, 92, 255, 0.20);
}


/* ========================================
   Full screen image lightbox
   ======================================== */

#image-lightbox {
  position: fixed !important;
  inset: 0 !important;

  width: 100vw !important;
  height: 100vh !important;

  z-index: 999999 !important;

  display: none !important;
  align-items: center !important;
  justify-content: center !important;

  padding: 32px !important;
  margin: 0 !important;

  background: rgba(3, 8, 18, 0.96) !important;
  backdrop-filter: blur(8px);

  overflow: hidden !important;
  cursor: zoom-out;
}

#image-lightbox.is-open {
  display: flex !important;
}

#image-lightbox .lightbox-image {
  display: block !important;

  width: auto !important;
  height: auto !important;

  max-width: 94vw !important;
  max-height: 90vh !important;

  margin: auto !important;
  padding: 0 !important;

  object-fit: contain !important;

  border-radius: 12px;

  box-shadow:
    0 30px 90px rgba(0, 0, 0, 0.65);

  cursor: zoom-out;
}

#image-lightbox .lightbox-close {
  position: absolute !important;

  top: 20px !important;
  right: 24px !important;

  z-index: 1000000 !important;

  width: 46px;
  height: 46px;

  display: grid !important;
  place-items: center;

  padding: 0;

  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;

  background: rgba(15, 23, 40, 0.92);

  color: white;

  font-size: 30px;
  line-height: 1;

  cursor: pointer;
}

#image-lightbox .lightbox-close:hover {
  background: var(--accent);
}

#image-lightbox .lightbox-close:focus-visible {
  outline: 3px solid var(--accent-2);
  outline-offset: 3px;
}

body.lightbox-open {
  overflow: hidden !important;
}


/* ========================================
   Responsive images / lightbox
   ======================================== */

@media (max-width: 720px) {

  .article-image-link {
    width: 100%;
  }

  .article-image-link img {
    width: 100% !important;
    max-width: 100% !important;
  }

  #image-lightbox {
    padding: 15px !important;
  }

  #image-lightbox .lightbox-image {
    max-width: calc(100vw - 30px) !important;
    max-height: 90vh !important;
  }

  #image-lightbox .lightbox-close {
    top: 12px !important;
    right: 12px !important;
  }
}