:root {
  color-scheme: dark;

  --bg-deep: #08080b;
  --bg: #0f0f14;
  --bg-elevated: #16161e;
  --surface: #1c1c26;
  --surface-hover: #242430;

  --text: #ece8e1;
  --text-soft: #c8c2b8;
  --muted: #8a847a;

  --ivory: #f2ece3;
  --stripe: rgba(255, 255, 255, 0.055);
  --stripe-strong: rgba(255, 255, 255, 0.1);

  --accent: #b8a8ff;
  --accent-bright: #d4caff;
  --accent-hover: #9d88ff;
  --accent-glow: rgba(184, 168, 255, 0.18);

  --teal: #5eead4;
  --teal-dim: rgba(94, 234, 212, 0.12);

  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  --code-bg: #12121a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);

  --max-width: 54rem;
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino,
    Georgia, serif;
  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo,
    Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg-deep);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent 55%),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 28px,
      var(--stripe) 28px,
      var(--stripe) 56px
    ),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
}

::selection {
  background: rgba(184, 168, 255, 0.35);
  color: var(--ivory);
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.container-wide {
  width: min(100% - 2rem, 72rem);
  margin-inline: auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 8, 11, 0.82);
  backdrop-filter: blur(16px) saturate(140%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 9px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border-strong);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.site-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ivory);
  line-height: 1.2;
}

.site-tagline {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  transition: color 0.15s ease, background 0.15s ease;
}

.site-nav a:hover {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.06);
}

.site-nav .nav-cta {
  color: var(--bg-deep);
  background: linear-gradient(135deg, var(--ivory) 0%, #d8d0c4 100%);
}

.site-nav .nav-cta:hover {
  color: var(--bg-deep);
  background: linear-gradient(135deg, #fff 0%, var(--ivory) 100%);
  box-shadow: 0 0 24px rgba(242, 236, 227, 0.15);
}

/* Main */

.page-content {
  padding: 2.75rem 0 5rem;
}

.page-content > h1:first-child {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  letter-spacing: -0.03em;
  color: var(--ivory);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(8, 8, 11, 0.9);
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-inner p {
  margin: 0;
}

.footer-zebra {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.footer-stripe {
  width: 2rem;
  height: 0.45rem;
  border-radius: 999px;
  background: repeating-linear-gradient(
    90deg,
    var(--ivory) 0 4px,
    transparent 4px 8px
  );
  opacity: 0.45;
}

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

.footer-inner a:hover {
  color: var(--accent-bright);
}

/* Typography */

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  margin-top: 2.25rem;
  margin-bottom: 0.85rem;
  color: var(--ivory);
}

h1:first-child,
h2:first-child {
  margin-top: 0;
}

h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  letter-spacing: -0.03em;
}

h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.12rem;
  color: var(--text);
}

p,
ul,
ol {
  margin: 0 0 1.1rem;
}

li {
  margin-bottom: 0.35rem;
}

strong {
  color: var(--ivory);
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration-color: rgba(184, 168, 255, 0.45);
  text-underline-offset: 0.15em;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-bright);
}

hr {
  border: 0;
  height: 1px;
  margin: 2.5rem 0;
  background: linear-gradient(
    90deg,
    transparent,
    var(--border-strong) 20%,
    var(--border-strong) 80%,
    transparent
  );
}

/* Tables */

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.25rem 0 1.75rem;
  font-size: 0.94rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(22, 22, 30, 0.65);
}

th,
td {
  padding: 0.7rem 0.9rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

tr:last-child td {
  border-bottom: 0;
}

th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 600;
  color: var(--ivory);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Code */

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: rgba(255, 255, 255, 0.06);
  color: var(--teal);
  padding: 0.14em 0.4em;
  border-radius: 6px;
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  color: var(--text-soft);
  font-size: 0.84rem;
}

.highlight .c,
.highlight .cm,
.highlight .c1 {
  color: #7a8494;
}

.highlight .k,
.highlight .kd {
  color: var(--accent);
}

.highlight .s,
.highlight .s1,
.highlight .s2 {
  color: #8fd4a8;
}

.highlight .nf,
.highlight .nx {
  color: var(--teal);
}

/* ASCII diagrams in pre */

pre:not(.highlight) {
  color: var(--text-soft);
}

.mermaid-figure {
  margin: 1.75rem 0;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  box-shadow: var(--shadow);
}

/* Landing page */

.hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 5vw, 3rem);
  margin-bottom: 2.5rem;
  background:
    linear-gradient(135deg, rgba(184, 168, 255, 0.08) 0%, transparent 45%),
    linear-gradient(180deg, var(--surface) 0%, var(--bg-elevated) 100%);
  box-shadow: var(--shadow);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: repeating-linear-gradient(
    180deg,
    var(--ivory) 0 10px,
    transparent 10px 20px
  );
  opacity: 0.55;
}

.hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: min(420px, 60vw);
  height: min(420px, 60vw);
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
  pointer-events: none;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1rem;
  padding: 0.35rem 0.75rem 0.35rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.hero-eyebrow .stripe-dot {
  width: 1.1rem;
  height: 0.55rem;
  border-radius: 999px;
  background: repeating-linear-gradient(
    90deg,
    var(--ivory) 0 3px,
    transparent 3px 6px
  );
}

.hero h1 {
  position: relative;
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  line-height: 1.08;
  max-width: 14ch;
}

.hero .lead {
  position: relative;
  font-size: 1.12rem;
  color: var(--text-soft);
  max-width: 38rem;
  margin-bottom: 0;
}

.hero-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.94rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: var(--bg-deep);
  background: linear-gradient(135deg, var(--ivory) 0%, #d8d0c4 100%);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.button-primary:hover {
  color: var(--bg-deep);
  box-shadow: 0 16px 40px rgba(242, 236, 227, 0.12);
}

.button-secondary {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-strong);
}

.button-secondary:hover {
  color: var(--ivory);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.22);
}

.section-label {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}

.card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--ivory) 0 6px,
    transparent 6px 12px
  );
  opacity: 0.35;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
}

.card h3 {
  margin-top: 0.35rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
}

.card h3 a {
  color: var(--ivory);
  text-decoration: none;
}

.card h3 a:hover {
  color: var(--accent-bright);
}

.card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.callout {
  margin: 2rem 0;
  padding: 1.25rem 1.35rem 1.25rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(94, 234, 212, 0.18);
  background: linear-gradient(135deg, var(--teal-dim) 0%, rgba(255, 255, 255, 0.02) 100%);
}

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

.callout strong {
  color: var(--teal);
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
  }

  .hero h1 {
    max-width: none;
  }
}