/* ==========================================================================
   Workflow Vitals - main.css
   Single stylesheet. No external imports, no web fonts, no third-party CSS.
   Mobile-first. Light + dark via prefers-color-scheme.
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------ */
:root {
  --ink:            #16191d;
  --ink-muted:      #5b6470;
  --ink-faint:      #838d99;
  --bg:             #ffffff;
  --bg-subtle:      #f6f7f9;
  --bg-sunken:      #eef0f3;
  --rule:           #dfe3e8;
  --rule-strong:    #c6ccd4;
  --accent:         #0f5d63;
  --accent-hover:   #0b4448;
  --accent-soft:    #e6f1f2;
  --focus:          #0f5d63;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Iowan Old Style", "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --measure: 68ch;
  --wrap: 68rem;
  --radius: 6px;

  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: 1.75rem;
  --step-4: 2.125rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:          #e7eaee;
    --ink-muted:    #a4aeb9;
    --ink-faint:    #7d8792;
    --bg:           #12151a;
    --bg-subtle:    #191d23;
    --bg-sunken:    #1f242b;
    --rule:         #2b313a;
    --rule-strong:  #3a424d;
    --accent:       #6fd3d9;
    --accent-hover: #9ae6ea;
    --accent-soft:  #16292b;
    --focus:        #6fd3d9;
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); margin-top: 2.25rem; }
h3 { font-size: var(--step-2); margin-top: 1.75rem; }
h4 { font-size: var(--step-1); margin-top: 1.5rem; font-family: var(--font-sans); }

p, ul, ol, dl { margin: 0 0 1.15rem; }
ul, ol { padding-left: 1.35rem; }
li { margin-bottom: 0.4rem; }
li::marker { color: var(--ink-faint); }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover { color: var(--accent-hover); }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

code, kbd, samp { font-family: var(--font-mono); font-size: 0.9em; }

abbr[title] { text-decoration: underline dotted; cursor: help; }

/* --- Layout ------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 48rem) {
  .wrap { padding-inline: 2rem; }
}

.prose { max-width: var(--measure); }

main { flex: 1 0 auto; padding-block: 2rem 3.5rem; }

@media (min-width: 48rem) {
  main { padding-block: 3rem 5rem; }
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #ffffff;
  padding: 0.7rem 1.1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus { left: 0; }

/* --- Site header / navigation ------------------------------------------ */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 0.9rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand:hover { color: var(--ink); }

.brand__mark {
  width: 1.55rem;
  height: 1.55rem;
  flex: none;
  color: var(--accent);
}

/* Toggle button is hidden by default so the navigation still works with
   JavaScript disabled. nav.js reveals it and enables collapsing. */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  font: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

.nav-toggle:hover { background: var(--bg-subtle); }
.js-nav .nav-toggle { display: inline-flex; }
.nav-toggle__bars { width: 1rem; height: 1rem; flex: none; }

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-nav li { margin: 0; }

.site-nav a {
  display: block;
  padding: 0.55rem 0.1rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.site-nav a:hover { color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }

/* Collapsed state only applies once JavaScript is present. */
.js-nav .site-nav {
  flex-basis: 100%;
  display: none;
  padding-bottom: 0.5rem;
}

.js-nav .site-nav.is-open { display: block; }

@media (min-width: 48rem) {
  .js-nav .nav-toggle { display: none; }

  .js-nav .site-nav,
  .js-nav .site-nav.is-open {
    display: block;
    flex-basis: auto;
    padding-bottom: 0;
  }

  .site-nav ul { flex-direction: row; gap: 1.5rem; align-items: center; }
  .site-nav a { padding: 0.2rem 0; border-bottom: 2px solid transparent; }
  .site-nav a[aria-current="page"] { border-bottom-color: var(--accent); }
}

/* --- Page intro --------------------------------------------------------- */
.page-head { margin-bottom: 2rem; }

.page-head .lede {
  font-size: var(--step-1);
  color: var(--ink-muted);
  max-width: var(--measure);
  margin-bottom: 0;
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink-faint);
  font-family: var(--font-sans);
  margin-bottom: 0.6rem;
}

.hero { padding-block: 1rem 1.5rem; }
.hero h1 { max-width: 20ch; }

.hero p {
  font-size: var(--step-1);
  color: var(--ink-muted);
  max-width: var(--measure);
}

/* --- Components --------------------------------------------------------- */
.section { margin-top: 3rem; }
.section > h2:first-child { margin-top: 0; }

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  padding: 0;
  margin: 0;
  list-style: none;
}

@media (min-width: 42rem) {
  .card-grid { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
}

.card {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--bg-subtle);
  margin: 0;
}

.card h3 { margin-top: 0; font-size: var(--step-1); }
.card p:last-child { margin-bottom: 0; }
.card--link { background: var(--bg); }
.card--link h3 a { text-decoration: none; }
.card--link h3 a:hover { text-decoration: underline; }

.card--placeholder {
  border-style: dashed;
  background: transparent;
  color: var(--ink-muted);
}

.card--placeholder h3 { color: var(--ink-muted); }

.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 1rem 1.15rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.75rem 0;
}

.note > :last-child { margin-bottom: 0; }

.note h2, .note h3 {
  margin-top: 0;
  font-family: var(--font-sans);
  font-size: var(--step-1);
}

.status-list { list-style: none; padding: 0; margin: 1.25rem 0; }

.status-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
}

.status-list li:first-child { border-top: 1px solid var(--rule); }
.status-list .label { flex: 1 1 12rem; }

.tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-muted);
  background: var(--bg-sunken);
  white-space: nowrap;
}

.meta {
  font-size: 0.875rem;
  color: var(--ink-faint);
  margin-bottom: 1.5rem;
}

.toc {
  background: var(--bg-subtle);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.toc h2 { margin: 0 0 0.6rem; font-size: 1rem; font-family: var(--font-sans); }
.toc ul { margin: 0; padding-left: 1.15rem; }
.toc li { margin-bottom: 0.25rem; }

/* --- Footer ------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-subtle);
  padding-block: 2rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
  flex-shrink: 0;
}

.site-footer nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  padding: 0;
  margin: 0 0 1rem;
}

.site-footer li { margin: 0; }
.site-footer p { margin: 0 0 0.5rem; max-width: var(--measure); }
.site-footer p:last-child { margin-bottom: 0; }