/* ----- Design tokens ----- */
:root {
  --bg: #fbfaf8;
  --bg-tint-a: #efeaff;
  --bg-tint-b: #fdeef4;
  --surface: #ffffff;
  --surface-2: #f4f2ef;
  --text: #1a1a22;
  --muted: #63636f;
  --border: #e7e4df;
  --accent: #6d5cff;
  --accent-2: #b45cff;
  --accent-soft: #efeaff;
  --accent-contrast: #ffffff;
  --shadow: 0 1px 2px rgba(26, 26, 34, 0.04), 0 8px 24px rgba(26, 26, 34, 0.06);
  --shadow-lift: 0 2px 6px rgba(26, 26, 34, 0.06), 0 18px 40px rgba(109, 92, 255, 0.14);
  --max-width: 760px;
  --radius: 16px;
  --radius-sm: 9px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --display: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f14;
    --bg-tint-a: #1c1636;
    --bg-tint-b: #221527;
    --surface: #17171e;
    --surface-2: #1e1e27;
    --text: #ececf3;
    --muted: #9c9cab;
    --border: #2a2a35;
    --accent: #9c8cff;
    --accent-2: #cf8cff;
    --accent-soft: #211d3a;
    --accent-contrast: #0f0f14;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.35);
    --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.4), 0 20px 44px rgba(109, 92, 255, 0.25);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: hidden;
}

/* Soft ambient colour glows behind everything */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(48ch 40ch at 12% -8%, var(--bg-tint-a), transparent 60%),
    radial-gradient(46ch 38ch at 100% 0%, var(--bg-tint-b), transparent 55%);
  opacity: 0.9;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 22px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1,
h2,
h3 {
  font-family: var(--display);
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.1rem, 6vw, 2.6rem);
  margin: 0 0 0.4em;
}

h2 {
  font-size: 1.6rem;
  margin: 0 0 0.5em;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface-2);
  padding: 0.15em 0.45em;
  border-radius: 6px;
}

pre {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  overflow-x: auto;
  box-shadow: var(--shadow);
}

pre code {
  background: none;
  padding: 0;
}

/* ----- Header / nav ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: linear-gradient(180deg, #3f5fd8, #3450c4);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.16);
  box-shadow: 0 2px 14px rgba(28, 40, 100, 0.22);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  color: #ffffff;
  font-size: 1.15rem;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-family: var(--display);
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(109, 92, 255, 0.35);
}

.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.98rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: #ffffff;
  text-decoration: none;
}

/* ----- Layout sections ----- */
main {
  padding: 56px 22px 72px;
}

.section {
  margin-bottom: 60px;
}

.hero {
  padding: 20px 0 12px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.6rem, 8vw, 3.6rem);
  font-weight: 600;
}

.accent {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  font-size: 1.22rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ----- Buttons ----- */
.button {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast);
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  box-shadow: 0 6px 18px rgba(109, 92, 255, 0.3);
  transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(109, 92, 255, 0.4);
}

.button-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.button-ghost:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow-lift);
}

/* ----- Lists ----- */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  padding: 16px 2px;
  border-bottom: 1px solid var(--border);
}

.feature-list li:last-child {
  border-bottom: none;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 1em 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.link-list a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  box-shadow: var(--shadow);
  transition: transform 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.link-list a:hover {
  text-decoration: none;
  transform: translateY(-2px);
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

/* ----- Cards ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity 0.18s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.4em;
  font-size: 1.2rem;
}

/* Whole-card link (home page hub) */
.card-link {
  display: block;
  color: var(--text);
}

.card-link:hover {
  text-decoration: none;
}

.card-link h3 {
  color: var(--text);
  transition: color 0.16s ease;
}

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

.card-link p {
  margin-bottom: 0;
  color: var(--muted);
}

.card-links {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ----- Blog ----- */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  padding: 22px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.post-list li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

.post-list .post-title {
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 600;
}

.post-list .post-title:hover {
  text-decoration: none;
}

.post-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.post-excerpt {
  color: var(--muted);
  margin: 8px 0 0;
}

.post-back {
  font-size: 0.95rem;
}

.post-back a {
  font-weight: 500;
}

/* ----- Prose (blog post body & about) ----- */
.prose {
  max-width: 66ch;
}

.prose p,
.prose ul,
.prose ol {
  margin: 1.1em 0;
}

.prose h2 {
  margin-top: 1.7em;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.prose blockquote {
  margin: 1.3em 0;
  padding: 0.4em 1.2em;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-style: italic;
}

/* Tables (research reports and any Markdown tables) */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95rem;
}

.prose th,
.prose td {
  text-align: left;
  padding: 9px 12px;
  border: 1px solid var(--border);
  vertical-align: top;
}

.prose th {
  background: var(--surface-2);
  font-weight: 600;
}

.prose tbody tr:nth-child(even) td {
  background: color-mix(in srgb, var(--surface-2) 45%, transparent);
}

/* Long-form research pages: use the full column width so tables breathe */
.research {
  max-width: none;
}

.research h2 {
  padding-top: 0.4em;
  border-top: 1px solid var(--border);
}

/* ----- Footer ----- */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

/* ----- Visitor counter (mechanical odometer) ----- */
.counter {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.counter-label {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.odometer {
  display: inline-flex;
  gap: 2px;
  padding: 4px;
  border-radius: 5px;
  background: #0a0a0a;
  box-shadow: inset 0 0 0 1px #000, inset 0 2px 5px rgba(0, 0, 0, 0.85),
    0 1px 2px rgba(0, 0, 0, 0.35);
}

/* each digit is a cylindrical drum: bright in the middle (facing you),
   curving into shadow at top and bottom */
.odo-digit {
  display: inline-grid;
  place-items: center;
  min-width: 0.82em;
  padding: 6px 4px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1;
  color: #f5f5f2;
  background: linear-gradient(
    180deg,
    #000 0%,
    #171717 16%,
    #3a3a3a 50%,
    #171717 84%,
    #000 100%
  );
  border-left: 1px solid #000;
  border-right: 1px solid #2c2c2c;
  text-shadow: 0 1px 1px #000, 0 0 1px rgba(0, 0, 0, 0.6);
}

.odo-digit:first-child {
  border-radius: 3px 0 0 3px;
}

.odo-digit:last-child {
  border-radius: 0 3px 3px 0;
}

/* ----- Entrance motion ----- */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

main > * {
  animation: rise 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

main > *:nth-child(2) {
  animation-delay: 0.06s;
}
main > *:nth-child(3) {
  animation-delay: 0.12s;
}
main > *:nth-child(4) {
  animation-delay: 0.18s;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* ----- Responsive ----- */
@media (max-width: 520px) {
  body {
    font-size: 17px;
  }
  main {
    padding: 40px 20px 56px;
  }
  .nav-links {
    gap: 15px;
  }
  .nav-links a {
    font-size: 0.92rem;
  }
  .lead {
    font-size: 1.12rem;
  }
}