/* louppe.eu — dark single-column design system */
:root {
  --bg: #000000;
  --surface: rgba(23, 17, 31, 0.78);
  --surface-strong: #2b1c3e;
  --ink: #f4effa;
  --ink-soft: #b9afc5;
  --muted: #82778e;
  --accent: #ad7cff;
  --accent-dark: #c5a5ff;
  --border: #302639;
  --border-accent: #55406c;
  --mesh-1: #649d87;
  --mesh-2: #534c74;
  --mesh-3: #a44642;
  --mesh-strength: 0.36;
  --mesh-blur: 42px;
  --grain-strength: 0.16;
  --grain-rate: 840ms;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;
  --page-max: 720px;
  --radius: 12px;
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.background-stage {
  position: absolute;
  z-index: 0;
  inset: 0;
  overflow: clip;
  overflow-clip-margin: 100vh;
  contain: layout style;
  background: var(--bg);
  pointer-events: none;
}

.background-fx {
  position: absolute;
  inset: 0;
}

.background-mesh { z-index: 0; }
.background-grain { z-index: 1; }

.mesh-blob {
  position: absolute;
  width: var(--blob-size);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle,
    color-mix(in srgb, var(--blob-color) calc(var(--mesh-strength) * 100%), transparent),
    transparent 70%);
  filter: blur(var(--mesh-blur));
  opacity: var(--blob-opacity, 1);
  animation: blob-drift var(--blob-speed) ease-in-out infinite alternate;
  animation-delay: var(--blob-delay, 0s);
  translate: 0 var(--blob-parallax-y, 0px);
  will-change: transform, translate;
}

.mesh-blob--1 {
  --blob-color: color-mix(in srgb, var(--mesh-1) 88%, var(--mesh-2));
  --blob-size: clamp(340px, 55vw, 780px);
  --blob-opacity: 1;
  --blob-speed: 22s;
  --blob-delay: -7s;
  --blob-scroll-speed: 0.42;
  --from-x: -8%; --from-y: -4%; --from-scale: 0.95;
  --to-x: 12%; --to-y: 8%; --to-scale: 1.12;
  top: -8%; left: -15%;
}

.mesh-blob--2 {
  --blob-color: color-mix(in srgb, var(--mesh-3) 86%, var(--mesh-2));
  --blob-size: clamp(260px, 40vw, 620px);
  --blob-opacity: 0.86;
  --blob-speed: 31s;
  --blob-delay: -19s;
  --blob-scroll-speed: 0.78;
  --from-x: 8%; --from-y: -6%; --from-scale: 1.08;
  --to-x: -12%; --to-y: 9%; --to-scale: 0.94;
  top: 3%; right: -8%;
}

.mesh-blob--3 {
  --blob-color: color-mix(in srgb, var(--mesh-2) 82%, var(--mesh-1));
  --blob-size: clamp(300px, 48vw, 700px);
  --blob-opacity: 0.92;
  --blob-speed: 25s;
  --blob-delay: -4s;
  --blob-scroll-speed: 0.56;
  --from-x: -10%; --from-y: 8%; --from-scale: 0.92;
  --to-x: 8%; --to-y: -10%; --to-scale: 1.15;
  top: 25%; left: 48%;
}

.mesh-blob--4 {
  --blob-color: color-mix(in srgb, var(--mesh-1) 78%, var(--mesh-3));
  --blob-size: clamp(240px, 37vw, 560px);
  --blob-opacity: 0.78;
  --blob-speed: 34s;
  --blob-delay: -24s;
  --blob-scroll-speed: 0.69;
  --from-x: -6%; --from-y: 10%; --from-scale: 1.05;
  --to-x: 15%; --to-y: -7%; --to-scale: 0.90;
  top: 47%; left: -12%;
}

.mesh-blob--5 {
  --blob-color: color-mix(in srgb, var(--mesh-3) 80%, var(--mesh-1));
  --blob-size: clamp(290px, 46vw, 680px);
  --blob-opacity: 0.74;
  --blob-speed: 28s;
  --blob-delay: -12s;
  --blob-scroll-speed: 0.40;
  --from-x: 12%; --from-y: 6%; --from-scale: 0.96;
  --to-x: -8%; --to-y: -12%; --to-scale: 1.13;
  top: 63%; right: -14%;
}

.mesh-blob--6 {
  --blob-color: color-mix(in srgb, var(--mesh-2) 76%, var(--mesh-3));
  --blob-size: clamp(360px, 60vw, 820px);
  --blob-opacity: 0.82;
  --blob-speed: 38s;
  --blob-delay: -29s;
  --blob-scroll-speed: 0.80;
  --from-x: -12%; --from-y: -6%; --from-scale: 1.10;
  --to-x: 10%; --to-y: 12%; --to-scale: 0.93;
  top: 79%; left: 18%;
}

@keyframes blob-drift {
  from { transform: translate3d(var(--from-x), var(--from-y), 0) scale(var(--from-scale)); }
  to { transform: translate3d(var(--to-x), var(--to-y), 0) scale(var(--to-scale)); }
}

.background-grain::before {
  content: "";
  position: absolute;
  inset: -20%;
  background-image: var(--grain-url);
  background-size: 512px 512px;
  filter: contrast(2.4) brightness(0.72);
  mix-blend-mode: screen;
  opacity: var(--grain-strength);
  animation: background-grain-shift var(--grain-rate) steps(1) infinite;
  will-change: transform;
}

@keyframes background-grain-shift {
  0% { transform: translate3d(0, 0, 0); }
  25% { transform: translate3d(-3%, 2%, 0); }
  50% { transform: translate3d(2%, -3%, 0); }
  75% { transform: translate3d(-2%, -2%, 0); }
  100% { transform: translate3d(3%, 1%, 0); }
}

.page {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  width: min(100% - 48px, var(--page-max));
  margin: 0 auto;
  padding: 72px 0 24px;
}

.stack {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 64px;
}

.intro {
  padding-bottom: 8px;
}

.name {
  margin: 0;
  color: var(--ink);
  font-size: clamp(3.75rem, 12vw, 6.5rem);
  font-weight: 650;
  line-height: 0.92;
  letter-spacing: -0.025em;
  text-transform: lowercase;
}

.meta {
  max-width: 660px;
  margin: 28px 0 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.65;
}

.intro > .desc {
  max-width: 620px;
  margin-top: 20px;
  font-size: 1.08rem;
}

.heading {
  margin: 0 0 20px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: lowercase;
}

a {
  color: var(--ink);
  text-decoration-color: var(--border-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--accent-dark);
  text-decoration-color: currentColor;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--surface-strong);
  outline-offset: 4px;
}

a[target="_blank"]::after {
  content: "↗";
  margin-left: 0.2em;
  font-family: var(--mono);
  font-size: 0.72em;
}

.links,
.pubs {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pubs {
  display: grid;
  gap: 28px;
}

.pubs > li {
  padding: 0;
}

.row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  font-weight: 600;
}

.tag {
  flex: none;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.desc {
  margin-top: 5px;
  color: var(--ink-soft);
  font-size: 0.96rem;
}

.demo-placeholder {
  display: grid;
  place-items: center;
  min-height: 300px;
  margin-top: 0;
  padding: 32px;
  border: 1px solid #505050;
  border-radius: var(--radius);
  background: rgba(38, 38, 38, 0.9);
  color: #bcbcbc;
  font-family: var(--mono);
  font-size: 0.76rem;
  text-align: center;
}

.links {
  display: grid;
  gap: 12px;
}

.links .row {
  padding: 0;
}

.footer {
  margin-top: 72px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
}

.footer a {
  color: var(--ink);
  text-decoration: none;
}

.footer a:hover,
.footer a:focus-visible {
  color: var(--accent-dark);
}

.copy-markdown {
  margin: 0;
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  letter-spacing: inherit;
  text-transform: lowercase;
  cursor: pointer;
}

.copy-markdown:hover {
  border-color: var(--border-accent);
  color: var(--accent);
}

.copy-source {
  position: fixed;
  inset: 0 auto auto -9999px;
}

@media (max-width: 560px) {
  .page {
    width: min(100% - 36px, var(--page-max));
    padding-top: 48px;
  }

  .stack { gap: 52px; }
  .meta { margin-top: 22px; }
  .row { gap: 12px; }
  .demo-placeholder { min-height: 220px; }

  .footer {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .copy-markdown {
    order: -1;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }

  .mesh-blob,
  .background-grain::before {
    animation: none !important;
  }
}