@import url("/css/tokens.css");

/* Design values come from tokens. Implementation mechanics (1fr, z-index,
   opacity) stay as written. Nothing here hard-codes a colour, a font stack,
   a spacing step or a line height. */

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--signal); text-underline-offset: 3px; }
a:focus-visible, .ns-btn:focus-visible, .ns-skip:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-none);
}

img, svg { max-width: 100%; }

.ns-visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}

.ns-skip {
  position: absolute; left: -9999px;
  background: var(--signal-fill); color: var(--on-signal);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
}
.ns-skip:focus { left: var(--space-5); top: var(--space-3); z-index: 2; }

/* ------------------------------------------------------------ page frame */

.ns-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  justify-content: space-between; align-items: center;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono); font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-muted);
}
.ns-meta__fields { display: flex; flex-wrap: wrap; gap: var(--space-5); }
/* No nav below tablet: five sections on one page don't earn a menu. */
.ns-meta__nav { display: none; }
.ns-meta__nav a { color: var(--ink-muted); text-decoration: none; }
.ns-meta__nav a:hover, .ns-meta__nav a[aria-current] { color: var(--ink); }

.ns-rev {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-4);
  padding: var(--space-3) var(--space-5);
  border-top: var(--stroke-hairline) solid var(--rule);
  color: var(--ink-muted);
}
.ns-rev__domain { display: none; }

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

.ns-hero {
  display: flex; flex-direction: column; gap: var(--space-6);
  padding: var(--space-5) var(--space-5) var(--space-8);
}

.ns-plate {
  border: var(--stroke-plate) solid var(--rule-strong);
  border-radius: var(--radius-none);
  padding: var(--space-4) var(--space-3) var(--space-3);
  display: flex; flex-direction: column; gap: var(--space-3);
  min-width: var(--plate-min); max-width: 342px;
}
.ns-plate__mark { margin: 0; line-height: 0; }
.ns-plate__mark svg { display: block; width: 100%; height: auto; color: var(--ink); }
.ns-plate__rule { height: var(--stroke-hairline); background: var(--rule); }
.ns-plate__tag {
  margin: 0; font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.4;
  letter-spacing: 0.02em; color: var(--signal);
}

.ns-hero__pitch { display: flex; flex-direction: column; gap: var(--space-6); align-items: flex-start; }
.ns-hero__lede { max-width: 32ch; }

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

.ns-section {
  margin: 0 var(--space-5);
  padding: var(--space-5) 0 var(--space-8);
  border-top: var(--stroke-hairline) solid var(--rule-strong);
}
.ns-section--lead { border-top: 0; }

.ns-label { display: block; color: var(--ink-muted); font-size: 0.875rem; font-weight: 600; letter-spacing: 0.06em; }
.ns-label__dot { padding: 0 0.15em; }

.ns-heading {
  margin: var(--space-4) 0 var(--space-4);
  font-size: 1.4375rem; line-height: 1.25; font-weight: 600; letter-spacing: -0.01em;
  max-width: 24ch;
}

.ns-lede { margin: 0; font-size: 1.1875rem; line-height: 1.5; color: var(--ink); }

.ns-prose { max-width: var(--measure-prose); display: flex; flex-direction: column; gap: var(--space-4); }
.ns-prose p { margin: 0; color: var(--ink-body); }

.ns-note { margin: var(--space-4) 0 0; color: var(--ink-muted); }

.ns-list { margin: 0; padding-left: 1.2em; max-width: var(--measure-prose); color: var(--ink-body); }
.ns-list li + li { margin-top: var(--space-2); }
.ns-list--links { list-style: none; padding-left: 0; }
.ns-list--steps { color: var(--ink-body); }

/* ------------------------------------------------ engagement models table */

.ns-models { display: flex; flex-direction: column; border-top: var(--stroke-hairline) solid var(--rule-strong); }
.ns-models__row {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: var(--stroke-hairline) solid var(--rule);
}
.ns-models__row:last-child { border-bottom-color: var(--rule-strong); }
.ns-models__id { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: var(--space-3); }
.ns-models__name { color: var(--signal); text-transform: uppercase; text-decoration: none; }
.ns-models__name:hover { text-decoration: underline; }
.ns-models__label { color: var(--ink-muted); }
.ns-models__blurb { margin: 0; color: var(--ink-body); max-width: var(--measure-prose); }

.ns-table { display: flex; flex-direction: column; border-top: var(--stroke-hairline) solid var(--rule-strong); }
.ns-table__row {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-3);
  padding: var(--space-4) 0; border-bottom: var(--stroke-hairline) solid var(--rule);
}
.ns-table__row:last-child { border-bottom-color: var(--rule-strong); }
.ns-table__name { color: var(--signal); text-transform: uppercase; white-space: nowrap; }
.ns-table__desc { color: var(--ink-muted); text-align: right; }

/* ------------------------------------------------------- examples register */

.ns-register { display: grid; gap: 0; border-top: var(--stroke-hairline) solid var(--rule-strong); }
.ns-register__row {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-4) 0; border-bottom: var(--stroke-hairline) solid var(--rule);
}
.ns-register__title { font-weight: 500; }
.ns-register__gloss { color: var(--ink-muted); }

/* -------------------------------------------------------------- spec list */

.ns-spec { margin: var(--space-6) 0 0; border-top: var(--stroke-hairline) solid var(--rule-strong); }
.ns-spec__row {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-3) 0; border-bottom: var(--stroke-hairline) solid var(--rule);
}
.ns-spec dt { color: var(--ink-muted); }
.ns-spec dd { margin: 0; color: var(--ink); }

.ns-model-label { margin: var(--space-3) 0 var(--space-5); color: var(--signal); text-transform: uppercase; }
.ns-route { margin: var(--space-4) 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-3); }
.ns-route__name { color: var(--signal); text-transform: uppercase; text-decoration: none; }
.ns-route__label { color: var(--ink-muted); }

/* ---------------------------------------------------------------- closing */

.ns-closing { display: flex; flex-direction: column; gap: var(--space-5); }
.ns-statement { margin: var(--space-4) 0 0; text-transform: uppercase; color: var(--ink); }
.ns-closing__line { margin: 0; font-size: 1.125rem; line-height: 1.55; color: var(--ink); max-width: var(--measure-prose); }
.ns-closing__actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-5); }
.ns-closing__email { color: var(--ink-body); }

/* The system's one piece of motion. Decorative, no JavaScript. */
.ns-statement--cursor::after {
  content: "_";
  margin-left: 0.08em;
  color: var(--signal);
  animation: ns-blink 1.6s steps(1, end) infinite;
}
@keyframes ns-blink { 0%, 55% { opacity: 1; } 56%, 100% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .ns-statement--cursor::after { animation: none; opacity: 1; }
}

.ns-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: var(--target-min); padding: 0 var(--space-5);
  background: var(--signal-fill); color: var(--on-signal);
  border: 0; border-radius: var(--radius-none);
  text-transform: uppercase; text-decoration: none;
}
.ns-btn:hover { filter: brightness(1.06); }

/* ------------------------------------------------------------- ≥ tablet */

@media (min-width: 768px) {
  .ns-meta, .ns-rev { padding-left: var(--space-8); padding-right: var(--space-8); }
  .ns-meta__nav { display: flex; flex-wrap: wrap; gap: var(--space-5); }
  .ns-rev__domain { display: inline; }
  .ns-hero {
    flex-direction: row; align-items: flex-end; justify-content: space-between;
    gap: var(--space-8); padding: var(--space-8) var(--space-8);
  }
  .ns-plate { max-width: 500px; flex: 0 0 auto; padding: var(--space-5) var(--space-4) var(--space-4); }
  .ns-plate__tag { font-size: 1.0625rem; }
  .ns-hero__lede { font-size: 1.375rem; max-width: 34ch; }

  .ns-section {
    margin: 0 var(--space-8);
    padding: var(--space-6) 0 var(--space-8);
    display: grid; grid-template-columns: 280px 1fr; column-gap: var(--space-7);
  }
  .ns-section > * { grid-column: 2; }
  .ns-section > .ns-label { grid-column: 1; grid-row: 1 / span 20; }
  .ns-heading { margin-top: 0; font-size: 1.75rem; }

  .ns-models__row { display: grid; grid-template-columns: 220px 1fr; column-gap: var(--space-6); align-items: start; }
  .ns-models__id { flex-direction: column; justify-content: flex-start; gap: var(--space-1); }

  .ns-register { grid-template-columns: 1fr 1fr; column-gap: var(--space-7); }

  .ns-spec__row { display: grid; grid-template-columns: 140px 1fr; column-gap: var(--space-5); align-items: baseline; }

  .ns-statement { font-size: 3rem; line-height: 1.05; }
  .ns-closing__line { font-size: 1.375rem; }
}