/* ==========================================================================
   Four Fluencies — fourfluencies.com
   Palette: cool paper ground; the four fluency colours carry the identity.
   Type:    Newsreader (display) / Inter (body, UI, diagrams)
   ========================================================================== */

:root {
  /* Ground */
  --paper:      #eef0ef;
  --surface:    #ffffff;
  --ink:        #1d2126;
  --ink-2:      #565f68;
  --ink-3:      #7d868e;
  --rule:       #d3d8d6;
  --rule-soft:  #e2e6e4;

  /* The four fluencies */
  --portfolio:       #4a3da8;
  --portfolio-field: #edebfa;
  --cosell:          #1f6b52;
  --cosell-field:    #e0f1e9;
  --delivery:        #a65131;
  --delivery-field:  #fae8dd;
  --program:         #98356a;
  --program-field:   #fae3ec;

  /* Maturity stages */
  --static:   #79828a;
  --adaptive: #a9762f;
  --ambient:  #2c6ca6;

  /* Measure & rhythm */
  --measure: 34rem;
  --wide:    62rem;
  --step:    1.6rem;
}

/* --------------------------------------------------------------- reset -- */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.72;
  font-feature-settings: "kern", "liga", "calt";
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  text-decoration-color: var(--ink-3);
}
a:hover { text-decoration-color: currentColor; }

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

/* -------------------------------------------------------------- layout -- */

.shell {
  width: 100%;
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

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

/* ------------------------------------------------------------ masthead -- */

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.masthead-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 2rem;
  padding-block: 1.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: Newsreader, Georgia, serif;
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  text-decoration: none;
  margin-right: auto;
}
.wordmark em { font-style: italic; }
.wordmark .mark { width: 1.375rem; height: 1.375rem; flex: none; }

.masthead nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.9375rem;
  color: var(--ink-2);
}
.masthead nav a { text-decoration: none; }
.masthead nav a:hover { text-decoration: underline; }
.masthead nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--nav-accent, var(--ink));
}

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

.hero {
  padding-block: 5rem 4rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3rem 4rem;
  align-items: center;
}

.hero h1 {
  font-family: Newsreader, Georgia, serif;
  font-weight: 400;
  font-size: clamp(2.4rem, 5.6vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  margin: 0 0 1.75rem;
  max-width: 18ch;
}
.hero h1 em { font-style: italic; }

.standfirst {
  font-size: 1.1875rem;
  line-height: 1.65;
  color: var(--ink-2);
  max-width: var(--measure);
  margin: 0;
}

/* the four fluency icons as the hero's visual anchor */
.hero-mark {
  display: grid;
  grid-template-columns: repeat(2, 8.5rem);
  gap: 0.75rem;
  flex: none;
}
.hero-mark span {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  border-radius: 16px;
  background: var(--field);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent);
}
.hero-mark svg { width: 3.25rem; height: 3.25rem; }

@media (max-width: 60rem) {
  .hero { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-mark {
    grid-template-columns: repeat(4, 1fr);
    max-width: 26rem;
    gap: 0.625rem;
  }
  .hero-mark svg { width: 2.25rem; height: 2.25rem; }
}
@media (max-width: 30rem) {
  .hero-mark svg { width: 1.75rem; height: 1.75rem; }
}

/* article pages keep the simple single-column hero */
.hero.plain { display: block; }

/* the homepage's closing claim */
.closer {
  font-family: Newsreader, Georgia, serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 24ch;
  margin: 0 0 2.5rem;
}

/* hero kicker sits above the headline */
.hero .kicker { margin-bottom: 1rem; color: var(--ink-3); }

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

.band { padding-block: 4rem; border-top: 1px solid var(--rule); }
.band:first-of-type { border-top: 0; }

.band > h2, .band > .shell > h2 {
  font-family: Newsreader, Georgia, serif;
  font-weight: 400;
  font-size: clamp(1.6rem, 3.2vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 0.75rem;
}

.band-note {
  color: var(--ink-2);
  max-width: var(--measure);
  margin: 0 0 2.5rem;
}

/* --------------------------------------------------- fluency definitions */

.fluencies {
  display: grid;
  gap: 0.625rem;
  margin: 0;
}

.fluency {
  display: grid;
  grid-template-columns: 3.5rem minmax(9rem, 15rem) 1fr;
  align-items: center;
  gap: 0 1.25rem;
  padding: 1.125rem 1.5rem 1.125rem 1.125rem;
  border-radius: 10px;
  background: var(--field);
  border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
}

.fluency-icon {
  display: grid;
  place-items: center;
  width: 3.5rem; height: 3.5rem;
  color: var(--accent);
}
.fluency-icon svg { width: 2rem; height: 2rem; }

.fluency dt {
  font-family: Newsreader, Georgia, serif;
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.012em;
  color: var(--accent);
}
.fluency dt small {
  display: block;
  font-family: Inter, sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  opacity: 0.62;
  margin-bottom: 0.3rem;
}

.fluency dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: color-mix(in srgb, var(--accent) 82%, var(--ink));
  border-left: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  padding-left: 1.25rem;
}

.f-portfolio { --accent: var(--portfolio); --field: var(--portfolio-field); }
.f-cosell    { --accent: var(--cosell);    --field: var(--cosell-field); }
.f-delivery  { --accent: var(--delivery);  --field: var(--delivery-field); }
.f-program   { --accent: var(--program);   --field: var(--program-field); }

@media (max-width: 44rem) {
  .fluency {
    grid-template-columns: 2.75rem 1fr;
    gap: 0.5rem 1rem;
    padding: 1rem;
  }
  .fluency-icon { width: 2.75rem; height: 2.75rem; }
  .fluency-icon svg { width: 1.6rem; height: 1.6rem; }
  .fluency dt { font-size: 1.25rem; }
  .fluency dd {
    grid-column: 1 / -1;
    border-left: 0;
    padding-left: 0;
    padding-top: 0.6rem;
    font-size: 0.9375rem;
  }
}

/* ---------------------------------------------------------- diagnostic -- */

.diagnostic {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 2rem;
}

.grid-head {
  display: grid;
  grid-template-columns: minmax(7rem, 12rem) repeat(3, 1fr);
  gap: 0.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule-soft);
  margin-bottom: 0.75rem;
}
.grid-head span {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  text-align: center;
}
.grid-head span:first-child { text-align: left; }
.grid-head .s-static   { color: var(--static); }
.grid-head .s-adaptive { color: var(--adaptive); }
.grid-head .s-ambient  { color: var(--ambient); }

.grid-row {
  display: grid;
  grid-template-columns: minmax(7rem, 12rem) repeat(3, 1fr);
  gap: 0.5rem;
  align-items: stretch;
  margin-bottom: 0.5rem;
}

.grid-label {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 550;
  font-size: 0.9375rem;
  color: var(--accent);
  padding-right: 0.5rem;
}
.grid-label svg { width: 1.125rem; height: 1.125rem; flex: none; }

.cell {
  appearance: none;
  border: 1px solid var(--rule);
  background: transparent;
  border-radius: 8px;
  min-height: 3rem;
  cursor: pointer;
  font: inherit;
  font-size: 0.8125rem;
  color: var(--ink-3);
  padding: 0.5rem;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}
.cell:hover { border-color: var(--accent); color: var(--ink-2); }
.cell[aria-pressed="true"] {
  background: var(--field);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.readout {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule-soft);
  font-size: 1rem;
  color: var(--ink-2);
  min-height: 3.5rem;
}
.readout strong { color: var(--ink); font-weight: 600; }
.readout .verdict {
  font-family: Newsreader, Georgia, serif;
  font-size: 1.35rem;
  line-height: 1.3;
  color: var(--ink);
  display: block;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.reset {
  appearance: none;
  background: none;
  border: 0;
  padding: 0;
  margin-top: 0.75rem;
  font: inherit;
  font-size: 0.875rem;
  color: var(--ink-3);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

@media (max-width: 40rem) {
  .diagnostic { padding: 1.25rem; }
  .grid-head, .grid-row { grid-template-columns: 1fr 1fr 1fr; }
  .grid-head span:first-child { display: none; }
  .grid-label {
    grid-column: 1 / -1;
    padding: 0.75rem 0 0.35rem;
  }
}

/* ------------------------------------------------------ maturity stages -- */

.stages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 0;
}

.stage {
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--tone) 25%, transparent);
  border-top: 3px solid var(--tone);
  border-radius: 10px;
  padding: 1.5rem 1.375rem;
}
.stage h3 {
  font-family: Newsreader, Georgia, serif;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--tone);
  margin: 0 0 0.15rem;
  letter-spacing: -0.012em;
}
.stage .gloss {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--tone) 70%, var(--ink-3));
  margin: 0 0 0.9rem;
}
.stage p:last-child { margin: 0; font-size: 0.9375rem; color: var(--ink-2); line-height: 1.6; }

.st-static   { --tone: var(--static); }
.st-adaptive { --tone: var(--adaptive); }
.st-ambient  { --tone: var(--ambient); }

@media (max-width: 46rem) {
  .stages { grid-template-columns: 1fr; }
}

/* -------------------------------------------------------------- essays -- */

.essay-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }

.essay-list li { border-top: 1px solid var(--rule); }
.essay-list li:last-child { border-bottom: 1px solid var(--rule); }

.essay-list a {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0 1.5rem;
  padding: 1.5rem 0;
  text-decoration: none;
  align-items: baseline;
}
.essay-list a:hover .essay-title { text-decoration: underline; text-underline-offset: 0.2em; }

.essay-date {
  font-size: 0.8125rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.essay-title {
  font-family: Newsreader, Georgia, serif;
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.012em;
  margin: 0 0 0.4rem;
}
.essay-blurb { margin: 0; font-size: 0.9375rem; color: var(--ink-2); line-height: 1.55; }

@media (max-width: 34rem) {
  .essay-list a { grid-template-columns: 1fr; gap: 0.4rem; }
}

/* ------------------------------------------------------- article pages -- */

.article { padding-block: 4rem 3rem; }

.kicker {
  font-size: 0.875rem;
  color: var(--accent, var(--ink-3));
  margin: 0 0 1.25rem;
  letter-spacing: 0.02em;
}

.article h1 {
  font-family: Newsreader, Georgia, serif;
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 22ch;
}

.byline {
  font-size: 0.9375rem;
  color: var(--ink-3);
  margin: 0 0 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
  max-width: var(--measure);
}

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

.prose p { margin: 0 0 var(--step); }

.prose > h2 {
  font-family: Newsreader, Georgia, serif;
  font-weight: 400;
  font-size: 1.85rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 3.25rem 0 1.1rem;
}

.prose > h3 {
  font-size: 1.0625rem;
  font-weight: 650;
  line-height: 1.4;
  margin: 2.5rem 0 0.75rem;
  color: var(--ink);
}

.prose ol, .prose ul { margin: 0 0 var(--step); padding-left: 1.35rem; }
.prose li { margin-bottom: 0.85rem; }
.prose li::marker { color: var(--ink-3); }

.lede {
  font-size: 1.1875rem;
  line-height: 1.62;
  color: var(--ink-2);
}

.claim {
  font-family: Newsreader, Georgia, serif;
  font-size: 1.5rem;
  line-height: 1.35;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 2.5rem 0;
  padding-left: 1.5rem;
  border-left: 3px solid var(--accent, var(--ink));
}

.question {
  font-weight: 600;
  color: var(--ink);
}

/* full-bleed figures inside articles */
.figure {
  max-width: var(--wide);
  margin: 3rem 0;
}
.figure figcaption {
  font-size: 0.8125rem;
  color: var(--ink-3);
  margin-top: 0.85rem;
}

/* --------------------------------------------------------- stage table -- */

.stage-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0 var(--step);
  font-size: 0.9375rem;
}
.stage-table th, .stage-table td {
  text-align: left;
  padding: 0.85rem 1rem 0.85rem 0;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}
.stage-table thead th {
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 600;
  border-bottom-color: var(--rule);
}
.stage-table tbody th { font-weight: 600; color: var(--accent); width: 11rem; }
.st-row-static   { --accent: var(--static); }
.st-row-adaptive { --accent: var(--adaptive); }
.st-row-ambient  { --accent: var(--ambient); }

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

.next {
  max-width: var(--measure);
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
}
.next h2 {
  font-family: Newsreader, Georgia, serif;
  font-weight: 400;
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.012em;
}

.colophon {
  max-width: var(--measure);
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ink-3);
}

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding-block: 2.5rem 3.5rem;
  font-size: 0.9375rem;
  color: var(--ink-3);
}
.site-footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-right: auto; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ------------------------------------------------------------- motion -- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ------------------------------------------------------ diagrams page -- */

.diagram { margin-block: 3.5rem; }
.diagram img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 12px;
}
.diagram figcaption {
  max-width: 46rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink-2);
  margin-top: 1rem;
}
.diagram figcaption strong { color: var(--ink); font-weight: 600; }
.diagram figcaption a {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--ink);
  text-decoration-color: var(--rule);
}