/* moonvar — wet glass, heavy ink.
   Light: pale pool water under acrylic, with a grid drawn on the floor.
   Dark: the same pool at night. Text stays sharp; only what lies behind the
   glass blurs. Every package keeps one hue everywhere it appears. */

:root {
  color-scheme: light;

  /* water */
  --water-1: #f7fdfb;
  --water-2: #e6f4f2;
  --water-3: #cfe7ea;
  --water-4: #aed6dd;
  --mint: #b9f6e6;

  /* glass */
  --glass: rgba(255, 255, 255, 0.52);
  --glass-2: rgba(255, 255, 255, 0.68);
  --glass-3: rgba(255, 255, 255, 0.82);
  --glass-line: rgba(255, 255, 255, 0.78);
  --glass-edge: rgba(9, 58, 60, 0.1);
  --ring: rgba(6, 47, 50, 0.09);
  --ring-2: rgba(6, 47, 50, 0.16);

  /* ink */
  --ink: #04211f;
  --ink-2: #143a3c;
  --ink-3: #41686b;
  --ink-4: #77999b;
  --bleed: rgba(6, 52, 54, 0.3);

  /* accents */
  --accent: #0b6b60;
  --accent-2: #14a08b;
  --accent-ink: #04443e;

  /* one hue per package, used on every page */
  --h-quic: #0b6b60;
  --h-prefix: #54419f;
  --h-leb128: #96590a;
  --h-lenenc: #a23429;
  --h-fixed: #2a5f8f;
  --amber: #96590a;
  --coral: #a23429;
  --violet: #54419f;

  /* code */
  --code-bg: #05201f;
  --code-ink: #d9f1ea;
  --code-dim: #7ea7a3;

  /* lines and shadow */
  --line: rgba(8, 54, 57, 0.11);
  --line-2: rgba(8, 54, 57, 0.2);
  --shadow: 0 30px 60px -40px rgba(4, 44, 48, 0.6), 0 2px 10px -6px rgba(4, 44, 48, 0.24);
  --shadow-sm: 0 14px 30px -22px rgba(4, 44, 48, 0.55);
  --shadow-tight: 0 1px 2px rgba(4, 44, 48, 0.06), 0 8px 20px -16px rgba(4, 44, 48, 0.5);

  /* type */
  --display: "Bricolage Grotesque", "Inter", system-ui, sans-serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  /* buttons */
  --btn-bg: #0a6357;
  --btn-bg-2: #0d7d6d;
  --btn-ink: #f4fffb;
  --btn-line: #075346;

  /* Surfaces that sit on the glass: chips, fields, buttons. One definition
     per theme, so nothing turns pale when the pool goes dark. */
  --fill: rgba(255, 255, 255, 0.42);
  --fill-2: rgba(255, 255, 255, 0.6);
  --fill-3: rgba(255, 255, 255, 0.76);
  --field: rgba(255, 255, 255, 0.82);

  --r: 20px;
  --r-sm: 12px;
  --shot: inset 0 1px 0 rgba(255, 255, 255, 0.75), inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --water-1: #06181c;
  --water-2: #072329;
  --water-3: #083036;
  --water-4: #041215;
  --mint: #7ff0d8;

  --glass: rgba(10, 41, 45, 0.5);
  --glass-2: rgba(12, 48, 52, 0.62);
  --glass-3: rgba(14, 56, 60, 0.74);
  --glass-line: rgba(150, 255, 238, 0.14);
  --glass-edge: rgba(0, 0, 0, 0.4);
  --ring: rgba(158, 246, 231, 0.1);
  --ring-2: rgba(158, 246, 231, 0.2);

  --ink: #effaf7;
  --ink-2: #cbe4df;
  --ink-3: #93b6b3;
  --ink-4: #6d8f8d;
  --bleed: rgba(150, 246, 226, 0.28);

  --accent: #5ce2cc;
  --accent-2: #8bf0dd;
  --accent-ink: #b6fff1;

  --h-quic: #5ce2cc;
  --h-prefix: #b7a8ff;
  --h-leb128: #f0b268;
  --h-lenenc: #ff9d88;
  --h-fixed: #8cc6f0;
  --amber: #f0b268;
  --coral: #ff9d88;
  --violet: #b7a8ff;

  --code-bg: #041618;
  --code-ink: #d8f2ec;
  --code-dim: #7ba4a1;

  --line: rgba(160, 240, 226, 0.12);
  --line-2: rgba(160, 240, 226, 0.22);
  --shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.85), 0 2px 12px -6px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 16px 34px -24px rgba(0, 0, 0, 0.9);
  --shadow-tight: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 24px -18px rgba(0, 0, 0, 0.8);

  --fill: rgba(255, 255, 255, 0.05);
  --fill-2: rgba(255, 255, 255, 0.08);
  --fill-3: rgba(255, 255, 255, 0.12);
  --field: rgba(255, 255, 255, 0.07);

  --btn-bg: #9defdc;
  --btn-bg-2: #b6f7e6;
  --btn-ink: #042120;
  --btn-line: #7fd9c6;

  --shot: inset 0 1px 0 rgba(180, 255, 242, 0.08), inset 0 0 0 1px rgba(180, 255, 242, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --water-1: #06181c;
    --water-2: #072329;
    --water-3: #083036;
    --water-4: #041215;
    --mint: #7ff0d8;

    --glass: rgba(10, 41, 45, 0.5);
    --glass-2: rgba(12, 48, 52, 0.62);
    --glass-3: rgba(14, 56, 60, 0.74);
    --glass-line: rgba(150, 255, 238, 0.14);
    --glass-edge: rgba(0, 0, 0, 0.4);
    --ring: rgba(158, 246, 231, 0.1);
    --ring-2: rgba(158, 246, 231, 0.2);

    --ink: #effaf7;
    --ink-2: #cbe4df;
    --ink-3: #93b6b3;
    --ink-4: #6d8f8d;
    --bleed: rgba(150, 246, 226, 0.28);

    --accent: #5ce2cc;
    --accent-2: #8bf0dd;
    --accent-ink: #b6fff1;

    --h-quic: #5ce2cc;
    --h-prefix: #b7a8ff;
    --h-leb128: #f0b268;
    --h-lenenc: #ff9d88;
    --h-fixed: #8cc6f0;
    --amber: #f0b268;
    --coral: #ff9d88;
    --violet: #b7a8ff;

    --code-bg: #041618;
    --code-ink: #d8f2ec;
    --code-dim: #7ba4a1;

    --line: rgba(160, 240, 226, 0.12);
    --line-2: rgba(160, 240, 226, 0.22);
    --shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.85), 0 2px 12px -6px rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 16px 34px -24px rgba(0, 0, 0, 0.9);
    --shadow-tight: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 24px -18px rgba(0, 0, 0, 0.8);

    --fill: rgba(255, 255, 255, 0.05);
    --fill-2: rgba(255, 255, 255, 0.08);
    --fill-3: rgba(255, 255, 255, 0.12);
    --field: rgba(255, 255, 255, 0.07);

    --btn-bg: #9defdc;
    --btn-bg-2: #b6f7e6;
    --btn-ink: #042120;
    --btn-line: #7fd9c6;

    --shot: inset 0 1px 0 rgba(180, 255, 242, 0.08), inset 0 0 0 1px rgba(180, 255, 242, 0.04);
  }
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

/* A scrollbar that reads as a bead of water running down the glass. The
   standard properties go behind the support query: Chrome drops every
   ::-webkit-scrollbar rule the moment scrollbar-color is set. */
@supports not selector(::-webkit-scrollbar) {
  html {
    scrollbar-width: thin;
    scrollbar-color: color-mix(in oklab, var(--accent) 55%, transparent) transparent;
  }
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--accent-2) 62%, transparent),
    color-mix(in oklab, var(--accent) 78%, transparent));
  border: 3px solid transparent;
  border-radius: 10px;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--accent) 88%, transparent),
    color-mix(in oklab, var(--accent-ink) 88%, transparent));
  background-clip: padding-box;
  border: 3px solid transparent;
}
::-webkit-scrollbar-button { display: none; }
::-webkit-scrollbar-corner { background: transparent; }

/* Code keeps its own scrollbar: a hairline, brighter on the dark block. */
pre::-webkit-scrollbar { height: 7px; }
pre::-webkit-scrollbar-track { background: transparent; }
pre::-webkit-scrollbar-thumb {
  background: color-mix(in oklab, var(--code-ink) 26%, transparent);
  border: 2px solid transparent;
  border-radius: 8px;
  background-clip: padding-box;
}

::selection {
  background: color-mix(in oklab, var(--accent) 24%, transparent);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: clip;
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.66;
  font-feature-settings: "cv05" 1, "ss03" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---- the pool ------------------------------------------------------- */

/* Two layers: the water itself, and a 24px grid drawn under it — the floor
   of the pool, which is a byte grid if you look at it long enough. */
.pool {
  position: fixed;
  inset: 0;
  z-index: -3;
  background:
    radial-gradient(110% 70% at 6% -14%, var(--water-1) 0%, transparent 56%),
    radial-gradient(70% 50% at 96% -8%, color-mix(in oklab, var(--mint) 55%, var(--water-1)) 0%, transparent 58%),
    radial-gradient(120% 90% at 50% 116%, color-mix(in oklab, var(--water-4) 78%, transparent) 0%, transparent 64%),
    linear-gradient(162deg, var(--water-1) 0%, var(--water-2) 46%, var(--water-3) 100%);
}

.pool::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(10, 96, 96, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(10, 96, 96, 0.055) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 0%, transparent 78%);
  opacity: 0.9;
}

.pool::after {
  content: "";
  position: absolute;
  inset: -30%;
  background:
    repeating-radial-gradient(circle at 18% 26%, rgba(255, 255, 255, 0.5) 0 2px, transparent 2px 96px),
    repeating-radial-gradient(circle at 82% 70%, rgba(255, 255, 255, 0.38) 0 2px, transparent 2px 148px),
    repeating-radial-gradient(circle at 46% 96%, rgba(255, 255, 255, 0.3) 0 2px, transparent 2px 210px);
  filter: blur(7px);
  opacity: 0.5;
  mix-blend-mode: soft-light;
  animation: drift 46s linear infinite;
}

:root[data-theme="dark"] .pool::before {
  background-image:
    linear-gradient(to right, rgba(140, 240, 226, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 240, 226, 0.055) 1px, transparent 1px);
}
:root[data-theme="dark"] .pool::after { opacity: 0.26; mix-blend-mode: screen; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .pool::before {
    background-image:
      linear-gradient(to right, rgba(140, 240, 226, 0.055) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(140, 240, 226, 0.055) 1px, transparent 1px);
  }
  :root:not([data-theme="light"]) .pool::after { opacity: 0.26; mix-blend-mode: screen; }
}

@keyframes drift {
  0%   { transform: translate3d(0, 0, 0) scale(1) rotate(0deg); }
  50%  { transform: translate3d(-2%, 1.5%, 0) scale(1.06) rotate(0.6deg); }
  100% { transform: translate3d(0, 0, 0) scale(1) rotate(0deg); }
}

/* Droplets: rings that spread and go, on click anywhere on the water. */
.ripple {
  position: fixed;
  pointer-events: none;
  z-index: 0;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  border: 1px solid color-mix(in oklab, var(--accent) 55%, transparent);
  animation: ripple 1600ms cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

@keyframes ripple {
  from { transform: scale(0.4); opacity: 0.75; }
  to   { transform: scale(26); opacity: 0; }
}

/* ---- type ----------------------------------------------------------- */

h1, h2, h3, h4 {
  font-family: var(--display);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.024em;
  margin: 0;
  text-wrap: balance;
}

/* The ink sits on the glass with a hair of its own colour bleeding out:
   a darker hue in light mode, a lighter one at night. */
h1, h2, .ink {
  text-shadow:
    0.45px 0.35px 0.55px var(--bleed),
    -0.35px 0.4px 0.6px var(--bleed),
    0 0 0.35px var(--bleed);
}

h1 {
  font-size: clamp(2.5rem, 5.9vw, 4.7rem);
  line-height: 0.95;
  letter-spacing: -0.045em;
  font-variation-settings: "opsz" 96;
}

h2 {
  font-size: clamp(1.55rem, 2.7vw, 2.2rem);
  line-height: 1.12;
  letter-spacing: -0.032em;
}

h3 {
  font-size: 1.04rem;
  line-height: 1.32;
  letter-spacing: -0.012em;
}

strong, b {
  color: var(--ink);
  font-weight: 650;
  text-shadow: 0.35px 0.3px 0.5px var(--bleed);
}

p { margin: 0 0 1rem; text-wrap: pretty; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 1px;
}
a:hover { text-decoration: underline; }

:where(a, button, input, select, [tabindex]):focus-visible {
  outline: 2px solid color-mix(in oklab, var(--accent) 70%, transparent);
  outline-offset: 2px;
  border-radius: 6px;
}

.mono, code, pre, kbd { font-family: var(--mono); font-variant-ligatures: none; }

code {
  font-size: 0.85em;
  padding: 0.1em 0.38em;
  border-radius: 6px;
  background: color-mix(in oklab, var(--ink) 7%, transparent);
  color: var(--ink);
  box-decoration-break: clone;
}

/* Numbers line up in columns wherever they are compared. */
b, .num, .octet, .ledger b, .cost-n, .lab-sum, .row-meta, td.mono {
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, color-mix(in oklab, var(--accent) 26%, transparent), transparent 60%);
}

.lede {
  font-size: clamp(1.02rem, 1.35vw, 1.14rem);
  line-height: 1.62;
  color: var(--ink-2);
  max-width: 60ch;
}

.dim { color: var(--ink-3); }
.small { font-size: 0.875rem; }
.tiny { font-size: 0.78rem; }

.wrap { width: min(1168px, 100% - 3rem); margin-inline: auto; }

.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 100;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  background: var(--ink);
  color: var(--water-1);
  transition: top 0.2s;
}
.skip:focus { top: 1rem; }

/* ---- bar ------------------------------------------------------------ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 10px 0;
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--water-1) 72%, transparent),
    color-mix(in oklab, var(--water-1) 34%, transparent));
  border-bottom: 1px solid color-mix(in oklab, var(--glass-line) 52%, transparent);
}

/* A lit edge under the bar, the way water meets a lip of glass. */
.topbar::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    color-mix(in oklab, var(--accent) 26%, transparent) 30%,
    color-mix(in oklab, var(--accent) 26%, transparent) 70%,
    transparent);
}

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

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-name {
  font-family: var(--display);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  font-variation-settings: "opsz" 32;
  text-shadow: 0.4px 0.3px 0.5px var(--bleed);
}
.brand-sub {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.brand-mark {
  position: relative;
  width: 21px;
  height: 21px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 26%, #ffffff 0%, transparent 40%),
    radial-gradient(circle at 52% 54%, var(--accent-2), var(--accent) 72%);
  box-shadow:
    inset 0 -2px 4px rgba(0, 40, 40, 0.32),
    0 0 0 1px color-mix(in oklab, var(--accent) 34%, transparent),
    0 4px 10px -6px color-mix(in oklab, var(--accent) 70%, transparent);
  align-self: center;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid color-mix(in oklab, var(--accent) 14%, transparent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  font-family: var(--mono);
  font-size: 0.77rem;
  letter-spacing: 0.02em;
}
.nav a {
  color: var(--ink-2);
  padding: 0.4rem 0.68rem;
  border-radius: 999px;
  transition: color 0.15s, background 0.15s, box-shadow 0.15s;
}
.nav a:hover {
  text-decoration: none;
  color: var(--ink);
  background: color-mix(in oklab, white 46%, transparent);
}
.nav a[aria-current="page"] {
  color: var(--ink);
  background: color-mix(in oklab, white 66%, transparent);
  box-shadow: var(--shot), 0 8px 18px -16px rgba(4, 44, 48, 0.8);
}
:root[data-theme="dark"] .nav a:hover,
:root[data-theme="dark"] .nav a[aria-current="page"] {
  background: color-mix(in oklab, white 8%, transparent);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .nav a:hover,
  :root:not([data-theme="light"]) .nav a[aria-current="page"] {
    background: color-mix(in oklab, white 8%, transparent);
  }
}
.nav a[aria-current="page"]::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 0.42rem;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: 2px;
  box-shadow: 0 0 6px -1px color-mix(in oklab, var(--accent) 90%, transparent);
}

.nav .gh {
  display: inline-flex;
  width: 32px;
  height: 32px;
  padding: 0;
  flex: none;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: var(--ink-2);
  transition: color 0.15s, background 0.15s;
}
/* The mark is drawn inside a 16-unit box with a little air around it, so it
   needs a size or two more than a filled glyph to weigh the same. */
.gh svg { width: 21px; height: 21px; flex: none; fill: currentColor; }
.gh:hover { background: var(--fill-2); color: var(--ink); }

.themebtn {
  width: 32px;
  height: 32px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid var(--glass-line);
  background: var(--fill-2);
  color: var(--ink-2);
  cursor: pointer;
  padding: 0;
  line-height: 1;
  font-size: 0.86rem;
  transition: color 0.15s, background 0.15s, transform 0.2s;
}
.themebtn:hover {
  color: var(--ink);
  background: var(--fill-3);
  transform: rotate(18deg);
}

/* ---- glass ---------------------------------------------------------- */

.glass {
  position: relative;
  border-radius: var(--r);
  border: 1px solid var(--glass-line);
  background:
    linear-gradient(158deg,
      color-mix(in oklab, white 64%, transparent) 0%,
      color-mix(in oklab, white 34%, transparent) 48%,
      color-mix(in oklab, white 46%, transparent) 100%);
  box-shadow:
    0 0 0 1px var(--ring),
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    inset 0 -22px 34px -34px rgba(6, 40, 44, 0.35),
    var(--shadow);
  backdrop-filter: blur(26px) saturate(1.55);
  -webkit-backdrop-filter: blur(26px) saturate(1.55);
}

:root[data-theme="dark"] .glass {
  background:
    linear-gradient(158deg,
      color-mix(in oklab, white 11%, transparent) 0%,
      color-mix(in oklab, white 4%, transparent) 50%,
      color-mix(in oklab, white 8%, transparent) 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .glass {
    background:
      linear-gradient(158deg,
        color-mix(in oklab, white 11%, transparent) 0%,
        color-mix(in oklab, white 4%, transparent) 50%,
        color-mix(in oklab, white 8%, transparent) 100%);
  }
}

.glass::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 8% -20%, rgba(255, 255, 255, 0.5), transparent 42%);
  opacity: 0.4;
  mix-blend-mode: screen;
}

/* ---- hero ----------------------------------------------------------- */

.hero {
  padding: clamp(2.6rem, 5.6vw, 4.4rem) 0 1.9rem;
  display: grid;
  grid-template-columns: 1.13fr 0.87fr;
  gap: clamp(1.5rem, 4vw, 3.6rem);
  align-items: start;
}
.hero-copy { min-width: 0; }
.hero-side { min-width: 0; padding-top: 2.55rem; padding-bottom: 0.35rem; }
.hero h1 { margin-bottom: 0; max-width: 23ch; }
.hero h1 .drop {
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: -0.05em;
  color: var(--accent);
  text-shadow: none;
  white-space: nowrap;
}

/* The five encodings, at a glance, under the headline: 1337 written five ways. */
.hero-bytes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
  margin-top: 1.4rem;
  padding: 0;
  list-style: none;
}
.hero-bytes li {
  --hue: var(--accent);
  display: inline-flex;
  align-items: baseline;
  gap: 0.38rem;
  padding: 0.3rem 0.5rem 0.28rem;
  border-radius: 8px;
  border: 1px solid color-mix(in oklab, var(--hue) 18%, var(--glass-line));
  background: var(--fill);
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--ink-3);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
.hero-bytes li:hover {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--hue) 45%, transparent);
  background: color-mix(in oklab, white 66%, transparent);
}

.hero-bytes li b {
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.hero-bytes li i {
  font-style: normal;
  color: var(--hue);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.hero-bytes li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--hue);
  align-self: center;
  opacity: 0.85;
}

.hero .lede { margin-bottom: 1.5rem; max-width: 50ch; }
.hero-links { display: flex; flex-wrap: wrap; gap: 0.6rem 0.7rem; align-items: center; }

.cmd {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1.2rem;
  padding: 0.4rem 0.45rem 0.4rem 0.7rem;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  background: var(--fill);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-2);
  width: fit-content;
  max-width: 100%;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset;
}
.cmd-prompt { color: var(--accent); opacity: 0.9; }
.cmd code { background: none; padding: 0; font-size: inherit; color: var(--ink); }
.cmd-copy {
  margin-left: 0.35rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.44rem;
  border-radius: 6px;
  border: 1px solid var(--line-2);
  background: var(--fill);
  color: var(--ink-3);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.cmd-copy:hover { color: var(--ink); background: color-mix(in oklab, var(--ink) 12%, transparent); }
.cmd-copy.done { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 45%, transparent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.79rem;
  letter-spacing: 0.02em;
  padding: 0.62rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--btn-line);
  background: linear-gradient(180deg, var(--btn-bg-2), var(--btn-bg));
  color: var(--btn-ink);
  cursor: pointer;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.22) inset,
    0 12px 24px -18px rgba(2, 30, 32, 0.9);
  transition: transform 0.15s, box-shadow 0.15s, filter 0.15s;
}
.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
  filter: brightness(1.06);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.26) inset,
    0 18px 28px -18px rgba(2, 30, 32, 0.95);
}
.btn:active { transform: translateY(0); }
.btn.ghost {
  background: color-mix(in oklab, white 48%, transparent);
  color: var(--ink);
  border-color: var(--glass-line);
  backdrop-filter: blur(12px);
  box-shadow: var(--shot);
}
.btn.ghost:hover { background: color-mix(in oklab, white 66%, transparent); }
:root[data-theme="dark"] .btn.ghost { background: color-mix(in oklab, white 7%, transparent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn.ghost { background: color-mix(in oklab, white 7%, transparent); }
}

/* ---- surface: the live panel ---------------------------------------- */

.surface {
  padding: 0;
  overflow: hidden;
  isolation: isolate;
}

/* The panel is a screen: a darker top band, then the rows on white. */
.surface::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 132px;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--accent) 6%, transparent),
    transparent);
  pointer-events: none;
}

.surface-head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  padding: 1.2rem 1.35rem 1.05rem;
  border-bottom: 1px solid color-mix(in oklab, var(--line) 70%, transparent);
}
.surface-head h2 { font-size: 1.2rem; letter-spacing: -0.03em; }
.surface-head > div:first-child > p {
  color: var(--ink-3);
  font-size: 0.845rem;
  max-width: 48ch;
  margin-top: 0.25rem;
}

.field { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 0.7rem; }
.field label {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.num {
  font-family: var(--mono);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  width: 15ch;
  padding: 0.46rem 0.68rem;
  border-radius: 11px;
  border: 1px solid var(--ring-2);
  background: var(--field);
  box-shadow: inset 0 1px 2px rgba(6, 40, 44, 0.07);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.num:hover { border-color: color-mix(in oklab, var(--accent) 32%, var(--ring-2)); }
.num:focus {
  outline: none;
  border-color: color-mix(in oklab, var(--accent) 55%, transparent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 16%, transparent);
}
select.num { width: auto; cursor: pointer; }

.surface-tools { display: grid; gap: 0.55rem; justify-items: end; }
.presets { display: flex; flex-wrap: wrap; gap: 0.28rem; justify-content: flex-end; }
.preset {
  font-family: var(--mono);
  font-size: 0.71rem;
  padding: 0.26rem 0.5rem;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--fill);
  color: var(--ink-2);
  cursor: pointer;
  transition: color 0.13s, background 0.13s, border-color 0.13s;
}
.preset:hover {
  background: var(--fill-3);
  border-color: color-mix(in oklab, var(--accent) 34%, var(--line));
  color: var(--ink);
}
.preset:active { transform: translateY(1px); }

.rows { display: grid; position: relative; }

.row {
  --hue: var(--accent);
  display: grid;
  grid-template-columns: minmax(128px, 168px) minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.8rem 1.1rem;
  padding: 0.7rem 1.35rem;
  border-top: 1px solid color-mix(in oklab, var(--line) 52%, transparent);
  box-shadow: inset 3px 0 0 -1px transparent;
  transition: background 0.15s, box-shadow 0.15s;
}
.row:first-child { border-top: 0; }
.row:hover {
  background: color-mix(in oklab, var(--hue) 5%, transparent);
  box-shadow: inset 3px 0 0 0 color-mix(in oklab, var(--hue) 55%, transparent);
}

/* One hue per encoding, the same one the cards and the bit lab use. */
.row[data-id="quic"] { --hue: var(--h-quic); }
.row[data-id="prefix"] { --hue: var(--h-prefix); }
.row[data-id="leb128"] { --hue: var(--h-leb128); }
.row[data-id="lebs"] { --hue: var(--h-leb128); }
.row[data-id="lenenc"] { --hue: var(--h-lenenc); }
.row[data-id="fixedbe"], .row[data-id="fixedle"] { --hue: var(--h-fixed); }

.row-name {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  min-width: 0;
}
.row-name b {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.855rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.row-name b::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--hue);
  flex: none;
}
.row-name span {
  font-size: 0.68rem;
  color: var(--ink-4);
  font-family: var(--mono);
  letter-spacing: 0.02em;
  padding-left: calc(6px + 0.4rem);
}

.octets {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  font-family: var(--mono);
  min-width: 0;
}
.octet {
  min-width: 2.5em;
  padding: 0.3em 0.44em 0.26em;
  text-align: center;
  border-radius: 7px;
  font-size: 0.855rem;
  font-weight: 600;
  color: var(--ink);
  background: linear-gradient(180deg,
    color-mix(in oklab, white 92%, transparent),
    color-mix(in oklab, white 70%, transparent));
  border: 1px solid color-mix(in oklab, var(--hue) 16%, white);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 0 0 1px rgba(6, 40, 44, 0.04),
    0 5px 12px -10px rgba(4, 44, 48, 0.85);
  letter-spacing: 0.02em;
  transition: transform 0.13s ease, box-shadow 0.13s ease, border-color 0.13s ease;
}
.row:hover .octet {
  border-color: color-mix(in oklab, var(--hue) 34%, white);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 0 0 1px rgba(6, 40, 44, 0.05),
    0 8px 16px -12px rgba(4, 44, 48, 0.9);
}
.octet:hover { transform: translateY(-1px); }

:root[data-theme="dark"] .octet {
  background: color-mix(in oklab, white 9%, transparent);
  border-color: color-mix(in oklab, var(--hue) 26%, transparent);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 6px 14px -12px #000;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .octet {
    background: color-mix(in oklab, white 9%, transparent);
    border-color: color-mix(in oklab, var(--hue) 26%, transparent);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 6px 14px -12px #000;
  }
}

.octet.sep {
  background: none;
  border: 0;
  box-shadow: none;
  min-width: 0;
  color: var(--ink-4);
}

.row-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.71rem;
  color: var(--ink-3);
  justify-self: end;
  text-align: right;
  white-space: nowrap;
}
.tick {
  display: inline-flex;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-size: 0.58rem;
  color: white;
  background: color-mix(in oklab, var(--hue, var(--accent)) 84%, transparent);
  box-shadow: 0 0 0 1px color-mix(in oklab, var(--hue, var(--accent)) 26%, transparent);
}
.bad {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.71rem;
  white-space: normal;
}
.bad::before {
  content: "!";
  display: inline-grid;
  place-items: center;
  width: 15px;
  height: 15px;
  margin-right: 0.35rem;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 0.6rem;
  vertical-align: 1px;
}

.surface-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  align-items: center;
  justify-content: space-between;
  padding: 0.68rem 1.35rem;
  border-top: 1px solid color-mix(in oklab, var(--line) 70%, transparent);
  background: color-mix(in oklab, var(--water-1) 30%, transparent);
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--ink-4);
  letter-spacing: 0.02em;
}
.surface-foot a { color: var(--accent); }

/* ---- ledger of numbers ---------------------------------------------- */

.ledger {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 2.4rem 0 0;
  border-radius: var(--r);
  overflow: hidden;
  background: color-mix(in oklab, var(--line) 90%, transparent);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-sm), var(--shot);
  backdrop-filter: blur(16px);
}
.ledger div {
  position: relative;
  padding: 1.1rem 1.3rem 1.15rem;
  background: color-mix(in oklab, white 46%, transparent);
}
:root[data-theme="dark"] .ledger div { background: color-mix(in oklab, white 5%, transparent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .ledger div { background: color-mix(in oklab, white 5%, transparent); }
}
.ledger b {
  display: block;
  font-family: var(--mono);
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 1;
  color: var(--ink);
}
.ledger b::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  margin: 0.5rem 0 0.45rem;
  border-radius: 2px;
  background: color-mix(in oklab, var(--accent) 45%, transparent);
}
.ledger span {
  display: block;
  font-size: 0.73rem;
  line-height: 1.4;
  color: var(--ink-3);
  letter-spacing: 0.01em;
}

/* ---- sections ------------------------------------------------------- */

section { padding: 3.6rem 0; }
.sec-head {
  margin-bottom: 1.8rem;
  max-width: 64ch;
}
.sec-head h2 { margin-bottom: 0.55rem; }
.sec-head p { color: var(--ink-3); max-width: 58ch; }

.grid { display: grid; gap: 1rem; }
.grid.five { grid-template-columns: repeat(5, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }

.card {
  --hue: var(--accent);
  position: relative;
  padding: 1.3rem 1.3rem 1.15rem;
  border-radius: var(--r);
  border: 1px solid var(--glass-line);
  background:
    linear-gradient(165deg,
      color-mix(in oklab, white 62%, transparent),
      color-mix(in oklab, white 34%, transparent));
  box-shadow: var(--shot), var(--shadow-sm);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  overflow: hidden;
  min-width: 0;
}
:root[data-theme="dark"] .card {
  background: linear-gradient(165deg,
    color-mix(in oklab, white 9%, transparent),
    color-mix(in oklab, white 4%, transparent));
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .card {
    background: linear-gradient(165deg,
      color-mix(in oklab, white 9%, transparent),
      color-mix(in oklab, white 4%, transparent));
  }
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shot), var(--shadow);
  border-color: color-mix(in oklab, var(--hue) 22%, var(--glass-line));
}

/* The mark of a package: a band of its colour along the top, leaving the
   card at the left edge in a square corner so the band starts where it says
   it starts. The other three corners keep the radius of every card here. */
.pkg-card {
  border-radius: 0 var(--r) var(--r) var(--r);
}
.pkg-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg,
    color-mix(in oklab, var(--hue) 70%, transparent),
    color-mix(in oklab, var(--hue) 6%, transparent) 72%);
}
.pkg-card[data-pkg="quic"] { --hue: var(--h-quic); }
.pkg-card[data-pkg="prefix"] { --hue: var(--h-prefix); }
.pkg-card[data-pkg="leb128"] { --hue: var(--h-leb128); }
.pkg-card[data-pkg="lenenc"] { --hue: var(--h-lenenc); }
.pkg-card[data-pkg="fixed"] { --hue: var(--h-fixed); }

/* The plain cards carry the same short rule as the ledger numbers, so the
   three of them read as one family. */
.card:not(.pkg-card) h3::before {
  content: "";
  display: block;
  width: 16px;
  height: 2px;
  margin-bottom: 0.7rem;
  border-radius: 2px;
  background: color-mix(in oklab, var(--accent) 42%, transparent);
}
.card:not(.pkg-card) h3 { margin-bottom: 0.15rem; }

.pkg-card { display: flex; flex-direction: column; gap: 0.45rem; }
.pkg-card h3 {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: color-mix(in oklab, var(--hue) 84%, var(--ink));
  letter-spacing: -0.01em;
}
.pkg-card .rule {
  font-size: 0.845rem;
  line-height: 1.55;
  color: var(--ink-3);
  min-height: 3.9em;
}
.pkg-card .eg {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--mono);
  font-size: 0.73rem;
  color: var(--ink-4);
  padding-top: 0.6rem;
  border-top: 1px solid color-mix(in oklab, var(--line) 65%, transparent);
}
.pkg-card .eg b {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.1rem 0.34rem;
  border-radius: 5px;
  background: color-mix(in oklab, var(--hue) 9%, transparent);
}

.linkcard {
  position: relative;
  display: block;
  color: inherit;
  text-decoration: none;
  padding: 1.3rem 1.35rem 1.25rem;
  border-radius: var(--r);
  border: 1px solid var(--glass-line);
  background: color-mix(in oklab, white 44%, transparent);
  box-shadow: var(--shot), var(--shadow-sm);
  backdrop-filter: blur(18px) saturate(1.4);
  transition: transform 0.18s, background 0.18s, box-shadow 0.18s;
  min-width: 0;
}
.linkcard:hover {
  text-decoration: none;
  transform: translateY(-3px);
  background: color-mix(in oklab, white 60%, transparent);
  box-shadow: var(--shot), var(--shadow);
}
:root[data-theme="dark"] .linkcard { background: color-mix(in oklab, white 5%, transparent); }
:root[data-theme="dark"] .linkcard:hover { background: color-mix(in oklab, white 8%, transparent); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .linkcard { background: color-mix(in oklab, white 5%, transparent); }
}
.linkcard h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}
.linkcard h3 span {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  transition: transform 0.18s ease;
}
.linkcard:hover h3 span { transform: translateX(4px); }
.linkcard p { margin: 0.45rem 0 0; font-size: 0.875rem; color: var(--ink-3); }

/* ---- tables --------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--r);
  border: 1px solid var(--glass-line);
  box-shadow: var(--shadow-sm), var(--shot);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.895rem;
  background: var(--fill);
  backdrop-filter: blur(18px);
}
thead th {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 500;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line-2);
  white-space: nowrap;
}
tbody td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid color-mix(in oklab, var(--line) 55%, transparent);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--fill); }
td.mono, th.mono { font-family: var(--mono); font-size: 0.81rem; }
td b { font-weight: 650; }

/* ---- code ----------------------------------------------------------- */

.code {
  position: relative;
  margin: 0 0 0.85rem;
  border-radius: 14px;
  border: 1px solid color-mix(in oklab, white 13%, transparent);
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--code-bg) 97%, transparent),
      color-mix(in oklab, var(--code-bg) 90%, transparent));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 18px 40px -34px rgba(0, 20, 22, 0.95);
  overflow: hidden;
  backdrop-filter: blur(8px);
  min-width: 0;
}
.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.34rem 0.6rem 0.34rem 0.85rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--code-dim);
}
.copy {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.18rem 0.42rem;
  border-radius: 5px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  background: rgba(255, 255, 255, 0.04);
  color: var(--code-dim);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s, border-color 0.15s;
}
.code:hover .copy, .copy:focus-visible { opacity: 1; }
.copy:hover { color: var(--code-ink); }
.copy.done { color: #9ff0d4; border-color: rgba(159, 240, 212, 0.4); }

.code pre {
  margin: 0;
  padding: 0.7rem 1rem 0.74rem;
  overflow-x: auto;
  overflow-y: hidden;
  font-family: var(--mono);
  font-size: 0.795rem;
  line-height: 1.62;
  color: var(--code-ink);
  tab-size: 2;
  white-space: pre;
  word-break: normal;
}
.code pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
.code .c { color: var(--code-dim); font-style: italic; }
.code .k { color: #8fe3cf; }
.code .s { color: #f0d29a; }
.code .n { color: #a9c8ff; }

.out {
  position: relative;
  margin: 0.15rem 0 1.6rem;
  /* Room above the text for the "output" label drawn by ::after. */
  padding: 1.55rem 1rem 0.78rem 1.1rem;
  border-left: 1px solid color-mix(in oklab, var(--accent) 34%, transparent);
  border-radius: 0 12px 12px 0;
  background: color-mix(in oklab, var(--accent) 4%, color-mix(in oklab, white 42%, transparent));
  font-family: var(--mono);
  font-size: 0.775rem;
  line-height: 1.7;
  color: var(--ink-2);
  white-space: pre;
  overflow-x: auto;
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--line) 55%, transparent);
}
.out::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 0.55rem;
  bottom: 0.55rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--accent) 70%, transparent),
    color-mix(in oklab, var(--accent) 18%, transparent));
}
/* The block is what the code above printed, and it says so. */
.out::after {
  content: "output";
  position: absolute;
  left: 1.1rem;
  top: 0.42rem;
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.out .ok { color: var(--accent); }

/* ---- guide ---------------------------------------------------------- */

.doc {
  display: grid;
  grid-template-columns: 208px minmax(0, 1fr);
  gap: 3.2rem;
  align-items: start;
  padding: 2.4rem 0 4rem;
}
.toc {
  position: sticky;
  top: 86px;
  padding-top: 0.22rem;
  font-size: 0.82rem;
  border-left: 1px solid color-mix(in oklab, var(--line-2) 70%, transparent);
  padding-left: 0.9rem;
}
.toc p {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin: 0 0 0.65rem;
}
.toc a {
  display: block;
  margin-left: -1px;
  padding: 0.26rem 0 0.26rem 0.5rem;
  border-left: 1px solid transparent;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.755rem;
  line-height: 1.4;
  transition: color 0.15s, border-color 0.15s;
}
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.chapter {
  padding: 0 0 2.7rem;
  scroll-margin-top: 88px;
  min-width: 0;
}
.chapter + .chapter {
  border-top: 1px solid color-mix(in oklab, var(--line) 60%, transparent);
  padding-top: 2.5rem;
}
.chapter h2 { margin-bottom: 0.65rem; }
.chapter h2 .num {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
  width: auto;
  padding: 0;
  background: none;
  border: 0;
  box-shadow: none;
}
.chapter > p { max-width: 68ch; }
.chapter ul { max-width: 68ch; padding-left: 1.1rem; }
.chapter li { margin-bottom: 0.35rem; }
.chapter h3 { margin: 1.6rem 0 0.5rem; }

.callout {
  border-radius: 13px;
  padding: 0.9rem 1.05rem;
  background: color-mix(in oklab, var(--accent) 7%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 20%, transparent);
  font-size: 0.875rem;
  color: var(--ink-2);
  margin: 0 0 1.2rem;
}
.callout b { color: var(--ink); }

/* ---- bits page ------------------------------------------------------ */

.lab {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 1.2rem;
  align-items: start;
}
.lab-main { padding: 1.2rem 1.35rem 1.35rem; position: relative; }
.lab-sum {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-3);
  padding: 0.28rem 0.55rem;
  border-radius: 8px;
  background: var(--fill);
  border: 1px solid color-mix(in oklab, var(--line) 70%, transparent);
}
.lab-sum b { color: var(--ink); font-weight: 600; }
.lab-side { padding: 1.15rem 1.25rem; }

.tabs { display: flex; flex-wrap: wrap; gap: 0.28rem; margin-bottom: 1.15rem; }
.tab {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.6rem;
  border-radius: 7px;
  border: 1px solid transparent;
  background: var(--fill);
  color: var(--ink-3);
  cursor: pointer;
  transition: color 0.14s, background 0.14s, border-color 0.14s;
}
.tab:hover { color: var(--ink); background: var(--fill-2); }
.tab[aria-selected="true"] {
  color: var(--accent-ink);
  border-color: color-mix(in oklab, var(--accent) 38%, transparent);
  background: color-mix(in oklab, var(--accent) 13%, transparent);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5) inset;
}

.bites {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1rem;
  padding: 1rem 1.05rem;
  border-radius: 13px;
  background: color-mix(in oklab, var(--ink) 3%, transparent);
  border: 1px solid color-mix(in oklab, var(--line) 60%, transparent);
  box-shadow: inset 0 1px 2px rgba(4, 44, 48, 0.05);
}
.bite { display: grid; gap: 0.26rem; }
.bite-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--ink-4);
}
.bite-head b { color: var(--ink); font-size: 0.78rem; font-weight: 600; }
.bits { display: flex; gap: 3px; flex-wrap: wrap; }
.bit {
  width: clamp(30px, 3.6vw, 46px);
  height: clamp(30px, 3.6vw, 46px);
  display: grid;
  place-items: center;
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--fill-2);
  border: 1px solid color-mix(in oklab, var(--line-2) 70%, transparent);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.bit:hover { transform: translateY(-2px); box-shadow: 0 5px 10px -8px rgba(4, 44, 48, 0.8); }
.bit.flag   { background: color-mix(in oklab, var(--coral) 26%, transparent); border-color: color-mix(in oklab, var(--coral) 44%, transparent); color: color-mix(in oklab, var(--coral) 88%, var(--ink)); }
.bit.prefix { background: color-mix(in oklab, var(--accent) 26%, transparent); border-color: color-mix(in oklab, var(--accent) 44%, transparent); color: var(--accent-ink); }
.bit.cont   { background: color-mix(in oklab, var(--amber) 26%, transparent); border-color: color-mix(in oklab, var(--amber) 44%, transparent); color: color-mix(in oklab, var(--amber) 88%, var(--ink)); }
.bit.marker { background: color-mix(in oklab, var(--violet) 24%, transparent); border-color: color-mix(in oklab, var(--violet) 42%, transparent); color: color-mix(in oklab, var(--violet) 86%, var(--ink)); }
.bit.sign   { background: color-mix(in oklab, var(--violet) 30%, transparent); border-color: color-mix(in oklab, var(--violet) 60%, transparent); color: color-mix(in oklab, var(--violet) 92%, var(--ink)); }
.bit.gap { width: 0.45em; border: 0; background: none; box-shadow: none; }

/* What the eight cells add up to, at the end of the row. */
.bite-dec {
  align-self: center;
  margin-left: 0.55rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-4);
  letter-spacing: 0.02em;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.05rem;
  font-family: var(--mono);
  font-size: 0.695rem;
  color: var(--ink-3);
  margin: 0.2rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid color-mix(in oklab, var(--line) 55%, transparent);
}
.legend i {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  display: inline-block;
  margin-right: 0.35rem;
  vertical-align: 0;
}
.legend .l-prefix { background: color-mix(in oklab, var(--accent) 50%, transparent); }
.legend .l-cont   { background: color-mix(in oklab, var(--amber) 50%, transparent); }
.legend .l-flag   { background: color-mix(in oklab, var(--coral) 50%, transparent); }
.legend .l-marker { background: color-mix(in oklab, var(--violet) 50%, transparent); }
.legend .l-sign   { background: color-mix(in oklab, var(--violet) 60%, transparent); }
.legend .l-value  { background: color-mix(in oklab, var(--ink) 22%, transparent); }

.steps { display: grid; gap: 0.5rem; margin: 0.4rem 0 0; }
.step {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  gap: 0.7rem;
  padding: 0.55rem 0.7rem;
  border-radius: 9px;
  background: var(--fill);
  border: 1px solid color-mix(in oklab, var(--line) 55%, transparent);
  font-size: 0.835rem;
  line-height: 1.5;
}
.step b {
  font-family: var(--mono);
  font-size: 0.71rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.step code { font-size: 0.78em; }

.chart { width: 100%; height: auto; display: block; }
.chart text { font-family: var(--mono); font-size: 9px; fill: var(--ink-3); }
.chart .bar { r: 3; }

.decode-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 0.7rem;
  padding: 0.5rem 0;
  border-top: 1px solid color-mix(in oklab, var(--line) 55%, transparent);
  font-size: 0.835rem;
}
.decode-row:first-child { border-top: 0; }
.decode-row .k { font-family: var(--mono); font-size: 0.77rem; color: var(--ink-4); }
.decode-row .v { font-family: var(--mono); font-size: 0.81rem; color: var(--ink); min-width: 0; }

/* ---- cost table ----------------------------------------------------- */

.cost { display: inline-flex; align-items: center; gap: 0.55rem; }
.cost-track {
  display: block;
  width: 62px;
  height: 5px;
  border-radius: 3px;
  background: color-mix(in oklab, var(--ink) 7%, transparent);
}
.cost-bar {
  display: block;
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg,
    color-mix(in oklab, var(--accent) 66%, transparent),
    color-mix(in oklab, var(--accent) 22%, transparent));
}
.cost-n { font-weight: 600; color: var(--ink); min-width: 1.4em; }

/* ---- API ------------------------------------------------------------ */

.api {
  display: grid;
  grid-template-columns: 228px minmax(0, 1fr);
  gap: 2.6rem;
  align-items: start;
  padding: 2.2rem 0 4rem;
}
.api-nav {
  position: sticky;
  top: 86px;
  max-height: calc(100vh - 108px);
  overflow-y: auto;
  padding-right: 0.6rem;
  font-size: 0.8rem;
}
.api-nav h4 {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 500;
  margin: 0 0 0.55rem;
}
.api-nav ol { list-style: none; margin: 0 0 1.1rem; padding: 0; }
.api-nav ol.sub {
  margin: 0.15rem 0 0.9rem 0.55rem;
  border-left: 1px solid color-mix(in oklab, var(--line) 60%, transparent);
}
.api-nav a {
  display: block;
  padding: 0.16rem 0 0.16rem 0.5rem;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.725rem;
  line-height: 1.45;
  border-left: 1px solid transparent;
  margin-left: -1px;
  transition: color 0.14s, border-color 0.14s;
}
.api-nav a:hover { color: var(--ink); text-decoration: none; }
.api-nav a.active { color: var(--accent); border-left-color: var(--accent); }
.api-nav > ol > li + li { margin-top: 0.75rem; }
.api-nav > ol > li > a {
  color: var(--ink);
  font-weight: 600;
  font-size: 0.775rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.api-nav > ol > li > a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--hue, var(--accent));
  flex: none;
}
.api-nav a[href="#fixed-top"] { --hue: var(--h-fixed); }
.api-nav a[href="#quic-top"] { --hue: var(--h-quic); }
.api-nav a[href="#prefix-top"] { --hue: var(--h-prefix); }
.api-nav a[href="#leb128-top"] { --hue: var(--h-leb128); }
.api-nav a[href="#lenenc-top"] { --hue: var(--h-lenenc); }

.api-body { min-width: 0; }
.api-filter {
  position: sticky;
  top: 68px;
  z-index: 5;
  display: flex;
  gap: 0.6rem;
  align-items: center;
  padding: 0.6rem 0 0.8rem;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--water-1) 66%, transparent) 45%,
    transparent);
}
.api-filter input {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.48rem 0.72rem;
  width: min(340px, 100%);
  border-radius: 9px;
  border: 1px solid var(--ring-2);
  background: var(--field);
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.api-filter input:focus {
  outline: none;
  border-color: color-mix(in oklab, var(--accent) 55%, transparent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 15%, transparent);
}
.api-filter .count {
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--ink-4);
  white-space: nowrap;
}
.entry[hidden], .band[hidden], .group[hidden] { display: none; }

.band {
  --hue: var(--accent);
  margin-bottom: 2.4rem;
  scroll-margin-top: 80px;
}
#fixed-top { --hue: var(--h-fixed); }
#quic-top { --hue: var(--h-quic); }
#prefix-top { --hue: var(--h-prefix); }
#leb128-top { --hue: var(--h-leb128); }
#lenenc-top { --hue: var(--h-lenenc); }

.band > p { color: var(--ink-3); max-width: 74ch; font-size: 0.905rem; }
.band-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.5rem;
  margin-bottom: 0.8rem;
  border-bottom: 1px solid var(--line-2);
  position: relative;
}
.band-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 74px;
  height: 2px;
  border-radius: 2px;
  background: color-mix(in oklab, var(--hue) 62%, transparent);
}
.band-head h2 {
  font-family: var(--mono);
  font-size: 1.18rem;
  letter-spacing: -0.035em;
  color: color-mix(in oklab, var(--hue) 80%, var(--ink));
}
.band-head .route { font-family: var(--mono); font-size: 0.69rem; color: var(--ink-4); }

.group {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 500;
  margin: 1.8rem 0 0.25rem;
}
.entry {
  padding: 0.95rem 0 1rem;
  border-bottom: 1px solid color-mix(in oklab, var(--line) 50%, transparent);
  scroll-margin-top: 128px;
  transition: background 0.2s;
}
.entry:target {
  background: linear-gradient(90deg,
    color-mix(in oklab, var(--hue) 7%, transparent),
    transparent 55%);
  box-shadow: inset 2px 0 0 color-mix(in oklab, var(--hue) 45%, transparent);
}
.entry h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  flex-wrap: wrap;
}
.kind {
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.13rem 0.36rem;
  border-radius: 4px;
  color: var(--accent-ink);
  background: color-mix(in oklab, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 26%, transparent);
  font-weight: 500;
}
.kind.ty { color: color-mix(in oklab, var(--violet) 85%, var(--ink)); background: color-mix(in oklab, var(--violet) 14%, transparent); border-color: color-mix(in oklab, var(--violet) 26%, transparent); }
.kind.er { color: color-mix(in oklab, var(--amber) 90%, var(--ink)); background: color-mix(in oklab, var(--amber) 14%, transparent); border-color: color-mix(in oklab, var(--amber) 26%, transparent); }

.sig {
  display: inline-block;
  max-width: 100%;
  margin: 0.45rem 0 0.55rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  background: color-mix(in oklab, var(--ink) 5%, transparent);
  border: 1px solid color-mix(in oklab, var(--line) 60%, transparent);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
  border-left: 2px solid color-mix(in oklab, var(--hue) 34%, transparent);
}
.entry p { font-size: 0.885rem; color: var(--ink-2); max-width: 74ch; }
.entry p code { font-size: 0.85em; }
.variants {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.variants li {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.26rem 0.58rem;
  max-width: 100%;
  border-radius: 6px;
  background: var(--fill);
  border: 1px solid color-mix(in oklab, var(--line) 55%, transparent);
}
.variants small {
  display: block;
  font-family: var(--sans);
  color: var(--ink-3);
  font-size: 0.73rem;
  margin-top: 0.1rem;
}
.member {
  margin: 0.6rem 0 0 0.9rem;
  padding-left: 0.8rem;
  border-left: 1px solid color-mix(in oklab, var(--line) 70%, transparent);
}
.member .sig { background: none; border: 0; padding: 0; margin: 0.3rem 0 0.3rem; }

/* ---- footer --------------------------------------------------------- */

footer.site {
  position: relative;
  padding: 2.2rem 0 2.8rem;
  margin-top: 2rem;
}
footer.site::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    color-mix(in oklab, var(--line-2) 90%, transparent) 18%,
    color-mix(in oklab, var(--line-2) 90%, transparent) 82%,
    transparent);
}
.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.71rem;
  color: var(--ink-4);
}
.foot nav { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.foot a { color: var(--ink-3); }
.foot a:hover { color: var(--ink); }

/* ---- reveal --------------------------------------------------------- */

.reveal { opacity: 1; }
.js .reveal { opacity: 0; transform: translateY(10px); }
.js .reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}
/* Cards arrive in sequence rather than all at once. */
.grid > .reveal.in:nth-child(2) { transition-delay: 60ms; }
.grid > .reveal.in:nth-child(3) { transition-delay: 120ms; }
.grid > .reveal.in:nth-child(4) { transition-delay: 180ms; }
.grid > .reveal.in:nth-child(5) { transition-delay: 240ms; }

/* Wide characters take two cells in a monospaced run; the page pads by display
   width, so any glyph outside ASCII is wrapped and given its cell width. */
.glyph { display: inline-block; }
.glyph.w2 { width: 2ch; }

/* ---- responsive ----------------------------------------------------- */

@media (width <= 1080px) {
  .grid.five { grid-template-columns: repeat(3, 1fr); }
  .api { grid-template-columns: 196px minmax(0, 1fr); gap: 2rem; }
  .lab { grid-template-columns: minmax(0, 1fr); }
  .pkg-card .rule { min-height: 0; }
}

@media (width <= 860px) {
  body { font-size: 16px; }
  .wrap { width: min(100% - 1.9rem, 100%); }
  .grid.five, .grid.three, .grid.two { grid-template-columns: 1fr; }
  .ledger { grid-template-columns: repeat(2, 1fr); }
  .row { grid-template-columns: 1fr; gap: 0.45rem; padding: 0.8rem 1rem; }
  .row-meta { justify-self: start; text-align: left; }
  .doc { grid-template-columns: minmax(0, 1fr); gap: 1.2rem; padding-top: 1.4rem; }
  .toc {
    position: static;
    min-width: 0;
    display: flex;
    gap: 0.4rem 1rem;
    flex-wrap: wrap;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 0.7rem;
  }
  .toc p { width: 100%; margin-bottom: 0.2rem; }
  .toc a { padding: 0; }
  .api { grid-template-columns: 1fr; }
  .api-nav {
    position: static;
    max-height: none;
    border-bottom: 1px solid var(--line);
    padding: 0 0 0.9rem;
  }
  .api-nav h4 { display: none; }
  .api-nav > ol { display: inline; margin: 0; }
  .api-nav > ol > li { display: inline; }
  .api-nav > ol > li > a {
    display: inline-block;
    margin: 0 0.35rem 0.35rem 0;
    padding: 0.36rem 0.7rem;
    border-radius: 8px;
    border: 1px solid color-mix(in oklab, var(--line) 90%, transparent);
    background: color-mix(in oklab, white 42%, transparent);
    font-size: 0.755rem;
  }
  .api-nav ol.sub { display: none; }
  .api-filter { position: static; backdrop-filter: none; }
  .hero { grid-template-columns: 1fr; gap: 1.3rem; align-items: start; }
  .hero-side { padding-top: 0; }
  .hero h1 { font-size: clamp(2.1rem, 9vw, 3rem); }
  .brand-sub { display: none; }
  .nav { font-size: 0.72rem; gap: 0.05rem; }
  .nav a { padding: 0.4rem 0.5rem; }
  .surface-head { padding: 1rem; }
  .surface-foot { padding: 0.68rem 1rem; }
  .surface-tools { justify-items: start; width: 100%; }
  .presets { justify-content: flex-start; }
  .bite .bits { gap: 2px; }
  .bit { width: clamp(26px, 6.4vw, 34px); height: clamp(26px, 6.4vw, 34px); font-size: 0.76rem; }
}

@media (width <= 520px) {
  .nav { font-size: 0.7rem; gap: 0; }
  .nav a { padding: 0.38rem 0.42rem; white-space: nowrap; }
  .nav a[aria-current="page"]::before { display: none; }
  .nav .gh { width: 30px; height: 30px; }
  .brand-name { font-size: 1.04rem; }
  .ledger { grid-template-columns: 1fr; }
  .num { width: 100%; }
  .field { width: 100%; }
  h1 { letter-spacing: -0.038em; }
  .hero-bytes li { font-size: 0.68rem; }
}

@media (prefers-reduced-motion: reduce) {
  .pool::after { animation: none; }
  .ripple { display: none; }
  html { scroll-behavior: auto; }
  .reveal, .js .reveal, .js .reveal.in { opacity: 1; transform: none; transition: none; }
  .btn:hover, .card:hover, .linkcard:hover, .octet:hover, .bit:hover,
  .hero-bytes li:hover, .themebtn:hover { transform: none; }
  .grid > .reveal.in:nth-child(n) { transition-delay: 0ms; }
}

html, button, input, textarea, select { font-variant-ligatures: no-contextual; }

/* The page scroll bar shows while the page moves or under the pointer and
   hides a moment after; it keeps its place, so nothing shifts. */
@supports selector(::-webkit-scrollbar) {
  html:not(.scrolling)::-webkit-scrollbar-thumb { background: transparent; border-color: transparent; box-shadow: none; }
}
@supports not selector(::-webkit-scrollbar) {
  html:not(.scrolling) { scrollbar-color: transparent transparent; }
}