/* ==========================================================================
   The Data Human — design tokens and shared components.
   Page-specific layout stays in each page's <style> block.
   ========================================================================== */

@font-face {
  font-family: 'Fraunces';
  src: url('/fonts/fraunces-var.woff2') format('woff2-variations');
  font-weight: 400 700;
  font-display: swap;
  font-style: normal;
}

@font-face {
  font-family: 'Inter';
  src: url('/fonts/inter-var.woff2') format('woff2-variations');
  font-weight: 400 700;
  font-display: swap;
  font-style: normal;
}

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */

:root {
  --display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* Palette lifted from the existing brand: the cream, rust and charcoal
     already used on the post graphics and the Index scorer. */
  --paper: #faf3ea;
  --paper-raised: #fffdf9;
  --paper-sunk: #f2e9dc;

  --ink: #2d2d2d;
  --ink-soft: #6b5f56;
  --ink-faint: #9a8e83;

  --rule: #e6d9c8;
  --rule-strong: #d9c9b5;

  --accent: #c1622c;
  --accent-hover: #a4501f;
  --accent-wash: rgba(193, 98, 44, 0.09);

  /* The four Index bands. These are data, not decoration — they carry meaning
     on the score pages, so they hold their hue in both themes. */
  --band-extraction: #b0362c;
  --band-developing: #b07d24;
  --band-trust: #2b7671;
  --band-human: #2c6642;

  --measure: 34rem;      /* prose line length */
  --container: 70rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);

  --step: clamp(4rem, 9vw, 7.5rem);  /* vertical rhythm between sections */

  --radius: 4px;
  --shadow: 0 1px 2px rgba(22, 24, 28, 0.04), 0 8px 24px rgba(22, 24, 28, 0.06);
}

/* Everyone starts in the light room. The cream page is the brand, and a first-time
   visitor arriving from LinkedIn should see it, whatever their OS is set to.
   Dark is opt-in through the toggle, and the choice persists. */

:root[data-theme='light'] {
  --paper: #faf3ea;
  --paper-raised: #fffdf9;
  --paper-sunk: #f2e9dc;
  --ink: #2d2d2d;
  --ink-soft: #6b5f56;
  --ink-faint: #9a8e83;
  --rule: #e6d9c8;
  --rule-strong: #d9c9b5;
  --accent: #c1622c;
  --accent-hover: #a4501f;
  --accent-wash: rgba(193, 98, 44, 0.09);
  --band-extraction: #b0362c;
  --band-developing: #b07d24;
  --band-trust: #2b7671;
  --band-human: #2c6642;
  --shadow: 0 1px 2px rgba(22, 24, 28, 0.04), 0 8px 24px rgba(22, 24, 28, 0.06);
}

:root[data-theme='dark'] {
  --paper: #191614;
  --paper-raised: #211d1a;
  --paper-sunk: #100e0d;
  --ink: #f0e9df;
  --ink-soft: #b3a597;
  --ink-faint: #857a6e;
  --rule: rgba(217, 201, 181, 0.16);
  --rule-strong: rgba(217, 201, 181, 0.3);
  --accent: #e07a3e;
  --accent-hover: #ee8d52;
  --accent-wash: rgba(224, 122, 62, 0.13);
  --band-extraction: #d4574c;
  --band-developing: #d3a044;
  --band-trust: #45a49e;
  --band-human: #4f9068;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* --------------------------------------------------------------------------
   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;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-feature-settings: 'kern' 1, 'liga' 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0 0 1.15em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
a:hover { color: var(--accent-hover); text-decoration-color: currentColor; }

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

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

/* Numerals line up in columns wherever a score is shown. */
.tabular { font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section { padding-block: var(--step); }

.section + .section { border-top: 1px solid var(--rule); }

/* A small caps label that opens a section. */
.eyebrow {
  font-family: var(--body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.25rem;
}

.lede {
  font-size: clamp(1.15rem, 1.7vw, 1.35rem);
  line-height: 1.5;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   Site header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(12px);
  border-bottom: 1px solid var(--rule);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.25rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--display);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.wordmark:hover { color: var(--ink); }
.wordmark svg { display: block; width: 22px; height: 22px; }

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.nav a {
  font-size: 0.9375rem;
  color: var(--ink-soft);
  text-decoration: none;
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current='page'] { color: var(--ink); font-weight: 500; }

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--rule-strong); }
.theme-toggle svg { width: 15px; height: 15px; display: block; }

@media (max-width: 40rem) {
  .nav { gap: 1rem; }
  .nav a { font-size: 0.875rem; }
}

/* On a narrow phone the wordmark wrapped to two lines and shunted into the nav.
   Keep it on one line and let both sides shrink instead. */
@media (max-width: 34rem) {
  .site-header__inner { gap: 0.6rem; }
  .wordmark { font-size: 0.9375rem; white-space: nowrap; }
  .wordmark svg { width: 19px; height: 19px; }
  .nav { gap: 0.65rem; }
  .nav a { font-size: 0.8125rem; white-space: nowrap; }
  .theme-toggle { width: 1.75rem; height: 1.75rem; }
}

/* Four nav items plus the toggle stop fitting alongside the words, so the mark
   carries the brand on its own and the navigation keeps the room. */
@media (max-width: 27rem) {
  .wordmark { font-size: 0; gap: 0; }
  .wordmark svg { width: 22px; height: 22px; }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--body);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: var(--accent-hover); color: #fff; }

.btn--ghost {
  border-color: var(--rule-strong);
  color: var(--ink);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--ink); color: var(--ink); }

/* An arrow link, the site's most common call to action. */
.arrow-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
}
.arrow-link::after {
  content: '→';
  transition: transform 0.15s ease;
}
.arrow-link:hover::after { transform: translateX(3px); }

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card {
  display: block;
  padding: 1.5rem;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

a.card:hover {
  border-color: var(--rule-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  color: inherit;
}

/* --------------------------------------------------------------------------
   The dimension shape — the site's core visual.
   Five spokes, one per Index dimension, each 0 to 4.
   -------------------------------------------------------------------------- */

/* The host must carry the width: an SVG with only a viewBox has no intrinsic
   size, so inside an auto-sized grid or flex cell it collapses to nothing. */
.shape-host {
  width: 100%;
  max-width: 300px;
}

.shape {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.shape__grid { fill: none; stroke: var(--rule); stroke-width: 1; }
.shape__axis { stroke: var(--rule); stroke-width: 1; }
/* Falls back to the accent when no brand colour is supplied. */
.shape { --shape-colour: var(--accent); }

/* Scored brands draw in their own colour, so a shape is identifiable at a
   glance. One variable feeds both the logo and the polygon. Each brand carries a
   dark-theme variant for where its own colour would vanish — TikTok's black
   disappears on a dark page. */
.brand-facebook { --brand-colour: #1877f2; }
.brand-tiktok   { --brand-colour: #1e1e1e; }
.brand-apple    { --brand-colour: #555555; }
.brand-linkedin { --brand-colour: #0a66c2; }
.brand-meta     { --brand-colour: #0064e0; }
.brand-spotify  { --brand-colour: #1db954; }
.brand-handm    { --brand-colour: #e50010; }
.brand-rbc      { --brand-colour: #005daa; }
.brand-td       { --brand-colour: #00833e; }
.brand-gander   { --brand-colour: var(--accent); }

:root[data-theme='dark'] .brand-facebook { --brand-colour: #4a94f7; }
:root[data-theme='dark'] .brand-tiktok   { --brand-colour: #ece9e3; }
:root[data-theme='dark'] .brand-apple    { --brand-colour: #c9c5be; }
:root[data-theme='dark'] .brand-linkedin { --brand-colour: #3d8de0; }
:root[data-theme='dark'] .brand-meta     { --brand-colour: #4a94f7; }
:root[data-theme='dark'] .brand-spotify  { --brand-colour: #3ddb74; }
:root[data-theme='dark'] .brand-handm    { --brand-colour: #f2555f; }
:root[data-theme='dark'] .brand-rbc      { --brand-colour: #4d94d6; }
:root[data-theme='dark'] .brand-td       { --brand-colour: #35b070; }

/* Set on .shape itself so it beats the fallback above. */
.brand-facebook .shape, .brand-tiktok .shape, .brand-apple .shape,
.brand-linkedin .shape, .brand-meta .shape, .brand-spotify .shape,
.brand-handm .shape, .brand-rbc .shape, .brand-td .shape,
.brand-gander .shape { --shape-colour: var(--brand-colour); }

/* Brand logo lockup, sitting above each shape. */
.brand-lockup {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.15rem;
}
/* Masked rather than inlined: the logo file is a flat silhouette, so painting it
   with background-color lets it take the brand colour (and the dark-theme
   variant) with no JS and no per-logo markup. */
.brand-lockup__logo {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  display: block;
  background-color: var(--brand-colour, var(--ink));
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}

.brand-lockup__logo[data-logo='facebook'] {
  -webkit-mask-image: url('/brand/logos/facebook.svg');
  mask-image: url('/brand/logos/facebook.svg');
}
.brand-lockup__logo[data-logo='tiktok'] {
  -webkit-mask-image: url('/brand/logos/tiktok.svg');
  mask-image: url('/brand/logos/tiktok.svg');
}
.brand-lockup__logo[data-logo='apple'] {
  -webkit-mask-image: url('/brand/logos/apple.svg');
  mask-image: url('/brand/logos/apple.svg');
}
.brand-lockup__logo[data-logo='linkedin'] {
  -webkit-mask-image: url('/brand/logos/linkedin.svg');
  mask-image: url('/brand/logos/linkedin.svg');
}
.brand-lockup__logo[data-logo='meta'] {
  -webkit-mask-image: url('/brand/logos/meta.svg');
  mask-image: url('/brand/logos/meta.svg');
}
.brand-lockup__logo[data-logo='spotify'] {
  -webkit-mask-image: url('/brand/logos/spotify.svg');
  mask-image: url('/brand/logos/spotify.svg');
}
.brand-lockup__logo[data-logo='handm'] {
  -webkit-mask-image: url('/brand/logos/handm.svg');
  mask-image: url('/brand/logos/handm.svg');
}

/* Brands with no icon available get a lettermark in the brand colour, so every
   row is identifiable rather than some rows silently having nothing. */
.brand-lockup__logo--letter {
  -webkit-mask-image: none; mask-image: none;
  background: transparent;
  color: var(--brand-colour, var(--ink));
  display: grid; place-items: center;
  font-family: var(--body); font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.02em;
  border: 1.5px solid currentColor; border-radius: 3px;
}

.shape__area {
  fill: color-mix(in srgb, var(--shape-colour) 16%, transparent);
  stroke: var(--shape-colour);
  stroke-width: 1.75;
  stroke-linejoin: round;
}
.shape__dot { fill: var(--shape-colour); }
.shape__label {
  font-family: var(--body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--ink-faint);
}

/* --------------------------------------------------------------------------
   Score band pill
   -------------------------------------------------------------------------- */

.band {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.28rem 0.6rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.band::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
}
.band--extraction { color: var(--band-extraction); }
.band--developing { color: var(--band-developing); }
.band--trust      { color: var(--band-trust); }
.band--human      { color: var(--band-human); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: 3rem 4rem;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: flex-start;
}

.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.site-footer__fine {
  margin-top: 2.5rem;
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--paper-raised);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
}
.skip-link:focus { left: 1rem; top: 1rem; }