/* ==========================================================================
   base.css — reset, document defaults, typography, layout primitives.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background-color: var(--canvas-mid);
  background-image:
    radial-gradient(120% 85% at 88% 104%, var(--canvas-bright) 0%, rgba(9, 17, 29, 0) 62%),
    radial-gradient(95% 70% at 50% -8%, #08101d 0%, rgba(8, 16, 29, 0) 70%);
  background-attachment: fixed;
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: var(--fs-400);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
  overflow-x: hidden;
}

/* thin scrollbar that matches the instrument look */
* { scrollbar-width: thin; scrollbar-color: var(--line-3) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: var(--line-2); border: 3px solid var(--canvas); border-radius: 6px; }
*::-webkit-scrollbar-track { background: transparent; }

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 560;
  line-height: var(--lh-head);
  letter-spacing: var(--tracking-head);
  text-wrap: balance;
}
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
figure { margin: 0; }
blockquote { margin: 0; }
hr { border: 0; border-top: 1px solid var(--line-1); margin: 0; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}
a:hover { color: var(--accent); }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

code, kbd, samp, pre { font-family: var(--font-mono); font-size: 0.92em; }

::selection { background: var(--accent-soft); color: var(--text-1); }

/* --- focus: visible, consistent, never removed --------------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 1px;
}
:focus:not(:focus-visible) { outline: none; }

/* --- layout -------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 820px; }

.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--line-2);
  position: relative;
}
.section--flush { border-top: 0; }
.section--tight { padding-block: clamp(40px, 4.5vw, 64px); }
.section--raised { background: rgba(11, 18, 32, 0.55); }
.section--mac { --accent: var(--mac); --accent-ink: var(--mac-ink); --accent-soft: var(--mac-soft); --accent-line: var(--mac-line); }

.grid { display: grid; gap: var(--sp-6); }
.grid--2 { grid-template-columns: minmax(0, 1fr); }
.grid--3 { grid-template-columns: minmax(0, 1fr); }
.grid--4 { grid-template-columns: minmax(0, 1fr); }

@media (min-width: 700px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 980px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid { gap: var(--sp-7); }
}

/* 12-col workhorse for asymmetric page layouts */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-8);
}
@media (min-width: 900px) {
  .split { grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--sp-7); }
  .split > .col-4  { grid-column: span 4; }
  .split > .col-5  { grid-column: span 5; }
  .split > .col-6  { grid-column: span 6; }
  .split > .col-7  { grid-column: span 7; }
  .split > .col-8  { grid-column: span 8; }
  .split > .col-9  { grid-column: span 9; }
  .split > .col-12 { grid-column: span 12; }
  .split--gap-lg { gap: var(--sp-10); }
}

/* --- typography ---------------------------------------------------------- */
.display {
  font-size: var(--fs-900);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-head);
  font-weight: 560;
}
.h1 { font-size: var(--fs-800); line-height: var(--lh-tight); letter-spacing: var(--tracking-head); }
.h2 { font-size: var(--fs-700); line-height: 1.1; letter-spacing: var(--tracking-head); }
.h3 { font-size: var(--fs-600); line-height: 1.2; letter-spacing: var(--tracking-tight); }
.h4 { font-size: var(--fs-500); line-height: 1.3; letter-spacing: var(--tracking-tight); font-weight: 560; }

.lede {
  font-size: var(--fs-500);
  line-height: 1.5;
  color: var(--text-2);
  max-width: var(--measure);
  letter-spacing: -0.005em;
}
.body { color: var(--text-2); max-width: var(--measure); }
.body--tight { max-width: var(--measure-tight); }
.small { font-size: var(--fs-200); color: var(--text-2); line-height: 1.55; }
.tiny { font-size: var(--fs-100); color: var(--text-3); line-height: 1.5; }
.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.005em;
  font-variant-numeric: tabular-nums;
}
.dim { color: var(--text-3); }
.muted { color: var(--text-2); }
.accent { color: var(--accent); }
.nowrap { white-space: nowrap; }

/* Strong vertical rhythm between stacked prose blocks */
.prose > * + * { margin-top: var(--sp-4); }
.prose > p { color: var(--text-2); max-width: var(--measure); }
.prose > p + p { margin-top: var(--sp-4); }
.prose strong { color: var(--text-1); font-weight: 560; }

/* --- lists that read like a datasheet ------------------------------------ */
.speclist { display: grid; gap: 0; }
.speclist li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: var(--sp-3);
  padding-block: var(--sp-3);
  border-top: 1px solid var(--line-1);
  font-size: var(--fs-300);
  color: var(--text-2);
  line-height: 1.55;
}
.speclist li:first-child { border-top: 0; }
.speclist li::before {
  content: "";
  width: 12px; height: 12px;
  margin-top: 6px;
  border-left: 1px solid var(--accent-line);
  border-bottom: 1px solid var(--accent-line);
  opacity: 0.9;
}
.speclist strong { color: var(--text-1); font-weight: 560; }

/* --- utilities ----------------------------------------------------------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: -100px;
  z-index: 200;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.06em;
  padding: 10px 16px;
  border-radius: 2px;
  transition: top var(--dur-1) var(--ease);
}
.skip-link:focus { top: var(--sp-4); color: var(--accent-ink); }

.mt-2 { margin-top: var(--sp-2); }
.mt-3 { margin-top: var(--sp-3); }
.mt-4 { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); }
.mt-6 { margin-top: var(--sp-6); }
.mt-7 { margin-top: var(--sp-7); }
.mt-8 { margin-top: var(--sp-8); }

.stack-2 > * + * { margin-top: var(--sp-2); }
.stack-3 > * + * { margin-top: var(--sp-3); }
.stack-4 > * + * { margin-top: var(--sp-4); }
.stack-5 > * + * { margin-top: var(--sp-5); }
.stack-6 > * + * { margin-top: var(--sp-6); }
.stack-7 > * + * { margin-top: var(--sp-7); }
.stack-8 > * + * { margin-top: var(--sp-8); }

.row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-3); }
.row--between { justify-content: space-between; }
.row--gap-lg { gap: var(--sp-5); }

[hidden] { display: none !important; }

/* --- overflow safety -------------------------------------------------------
   Grid and flex children default to min-width:auto, so anything containing a
   table, a long path or a monospace version string can push the page wider
   than the viewport. Every track is minmax(0,1fr) and these children may
   shrink; wide tables scroll inside their own frame instead. */
.split > *, .grid > *, .feature > *, .specsheet > *, .lines > *,
.tiers > *, .proof > *, .svc-detail > *, .pd-hero > *, .line-page-head > *,
.legal > *, .product, .manifest__body, .pcard, .table-wrap { min-width: 0; }
.table-wrap { max-width: 100%; }