:root {
  --pico-font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --pico-border-radius: 14px;
  --pico-typography-spacing-vertical: 1.1rem;
  --pico-primary: #2563eb;
  --pico-primary-hover: #1d4ed8;
  --pico-primary-focus: rgba(37, 99, 235, 0.22);
  --surface-soft: rgba(37, 99, 235, 0.055);
  --surface-code: #0f172a;
  --line-soft: rgba(100, 116, 139, 0.24);
  --text-soft: #64748b;
  --accent-warm: #f97316;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 0%, rgba(37, 99, 235, 0.08), transparent 30rem),
    radial-gradient(circle at 92% 8%, rgba(249, 115, 22, 0.06), transparent 26rem),
    var(--pico-background-color);
}

main.container {
  max-width: 1120px;
  padding-top: 2.2rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--line-soft);
  background: color-mix(in srgb, var(--pico-background-color) 87%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 2rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--pico-color);
  text-decoration: none;
}

.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 9px;
  background: var(--surface-code);
  color: #f8fafc;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.08em;
}

.logo-text {
  font-size: 1.16rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.main-nav a {
  color: var(--pico-color);
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 650;
  opacity: 0.78;
}

.main-nav a:hover,
.main-nav a:focus {
  opacity: 1;
  color: var(--pico-primary);
}

/* Home */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 4vw, 3.6rem);
  border: 1px solid var(--line-soft);
  border-radius: 24px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.24)),
    var(--surface-soft);
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  .hero {
    background:
      linear-gradient(145deg, rgba(15, 23, 42, 0.72), rgba(15, 23, 42, 0.32)),
      var(--surface-soft);
  }
}

.hero::before {
  content: "";
  position: absolute;
  top: -8rem;
  right: -8rem;
  width: 19rem;
  height: 19rem;
  border-radius: 50%;
  border: 3.2rem solid rgba(37, 99, 235, 0.08);
  pointer-events: none;
}

.hero .prose {
  position: relative;
  z-index: 1;
}

.hero h1 {
  max-width: 18ch;
  font-size: clamp(2.35rem, 6vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
  margin-bottom: 1.4rem;
}

.hero h1 + p {
  max-width: 70ch;
  font-size: clamp(1.12rem, 2vw, 1.36rem);
  line-height: 1.65;
  color: color-mix(in srgb, var(--pico-color) 82%, transparent);
}

.hero hr {
  margin: 3.2rem 0;
  border-color: var(--line-soft);
}

.hero h2 {
  margin-top: 2.8rem;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  letter-spacing: -0.025em;
}

.hero h3 {
  margin-top: 2rem;
  font-size: 1.25rem;
}

.hero strong {
  color: color-mix(in srgb, var(--pico-color) 94%, var(--pico-primary));
}

/* Articles */
.grid.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.15rem;
  margin-top: 1.1rem;
}

.card {
  height: 100%;
  padding: 1.2rem;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: color-mix(in srgb, var(--pico-card-background-color) 93%, transparent);
  box-shadow: 0 14px 45px rgba(15, 23, 42, 0.055);
}

.card h3 {
  margin-bottom: 0.45rem;
  line-height: 1.28;
}

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

.card .cover {
  display: block;
  height: 190px;
  margin-bottom: 0.9rem;
  border-radius: 12px;
  background-position: center;
  background-size: cover;
}

.muted {
  color: var(--text-soft);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 0.2rem 0.62rem;
  text-decoration: none;
  font-size: 0.86rem;
}

/* Long-form content */
.prose,
.post {
  max-width: 860px;
  margin-inline: auto;
}

.prose {
  font-size: 1.075rem;
  line-height: 1.78;
}

.prose p,
.prose ul,
.prose ol {
  margin-bottom: 1.35rem;
}

.prose h1,
.prose h2,
.prose h3 {
  text-align: left;
  text-wrap: balance;
}

.prose h1 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.25rem, 5vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.038em;
}

.prose h2 {
  margin-top: 3.1rem;
  padding-top: 0.35rem;
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  letter-spacing: -0.022em;
}

.prose h3 {
  margin-top: 2.1rem;
  font-size: 1.28rem;
}

.prose a {
  text-underline-offset: 0.17em;
}

.prose blockquote {
  margin: 2rem 0;
  padding: 1.1rem 1.3rem;
  border-left: 4px solid var(--pico-primary);
  border-radius: 0 12px 12px 0;
  background: var(--surface-soft);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose code:not(pre code) {
  padding: 0.12rem 0.35rem;
  border-radius: 5px;
  background: color-mix(in srgb, var(--pico-code-background-color) 88%, transparent);
  overflow-wrap: anywhere;
}

.prose pre {
  margin: 1.4rem 0 1.8rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 12px;
  background: var(--surface-code);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow-x: auto;
}

.prose pre code {
  color: #e2e8f0;
  font-size: 0.9rem;
  line-height: 1.62;
  white-space: pre;
}

.prose del {
  color: var(--text-soft);
  text-decoration-thickness: 0.12em;
}

.prose hr {
  margin: 3rem 0;
  border-color: var(--line-soft);
}

.post > h1 {
  margin-top: 0.3rem;
  margin-bottom: 0.8rem;
  font-size: clamp(2.25rem, 5vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.post > .tags {
  margin-bottom: 2rem;
}

.post .prose > h1:first-child {
  display: none;
}

.post-hero img,
.prose img {
  width: 100%;
  height: auto;
  margin: 2rem 0;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
}

table {
  font-size: 0.95rem;
}

.footer {
  max-width: 1120px;
  margin-top: 4rem;
  padding-top: 1.4rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid var(--line-soft);
  color: var(--text-soft);
}

.footer a {
  color: inherit;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.75rem;
    padding-block: 0.85rem;
  }

  .main-nav {
    width: 100%;
    gap: 0.85rem;
    overflow-x: auto;
    padding-bottom: 0.15rem;
  }

  .main-nav a {
    white-space: nowrap;
  }

  main.container {
    padding-top: 1.2rem;
  }

  .hero {
    border-radius: 18px;
  }

  .prose {
    font-size: 1rem;
    line-height: 1.72;
  }

  .prose pre {
    margin-inline: -0.25rem;
    padding: 1rem;
    border-radius: 10px;
  }
}

/* Bilingual navigation */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.main-nav a.active,
.main-nav a[aria-current="page"] {
  color: var(--pico-primary);
  opacity: 1;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.32rem 0.58rem;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.language-switch a {
  color: var(--text-soft);
  text-decoration: none;
}

.language-switch a.active,
.language-switch a[aria-current="page"] {
  color: var(--pico-primary);
}

.language-switch span {
  color: var(--line-soft);
}

/* Product teaser: the first quote on the home page is the DVfile promise. */
.prose-home blockquote {
  padding: clamp(1.25rem, 3vw, 2rem);
  border-left-width: 6px;
  border-radius: 0 18px 18px 0;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(249, 115, 22, 0.07)),
    var(--surface-soft);
  box-shadow: 0 16px 44px rgba(15, 23, 42, 0.07);
  font-size: clamp(1.18rem, 2.2vw, 1.5rem);
  line-height: 1.5;
}

.prose-home h2:nth-of-type(1) {
  display: inline-block;
  padding: 0.38rem 0.72rem;
  border: 1px solid color-mix(in srgb, var(--pico-primary) 30%, var(--line-soft));
  border-radius: 10px;
  background: color-mix(in srgb, var(--pico-primary) 8%, transparent);
}

.articles-section {
  margin-top: 3.2rem;
}

@media (max-width: 900px) {
  .header-actions {
    align-items: flex-end;
    flex-direction: column-reverse;
    gap: 0.55rem;
  }
}

@media (max-width: 760px) {
  .header-actions {
    width: 100%;
    align-items: flex-start;
    flex-direction: column-reverse;
  }

  .language-switch {
    align-self: flex-end;
  }
}