/* Atul4Data design system. Palette preserved from v1.2; light/dark via tokens. */
:root {
  /* Brand palette (unchanged) */
  --naval: #2F3D4C;
  --resolute: #85B0C4;
  --dried-thyme: #7B8070;
  --storm-cloud: #7A848D;
  --iron-ore: #434341;
  --bone-white: #EDEAE5;
  --pure-white: #FFFFFF;

  /* Semantic tokens: light */
  --bg: #F4F4F2;
  --surface: #FFFFFF;
  --surface-tint: rgba(133, 176, 196, 0.14);
  --text: var(--iron-ore);
  --text-muted: #5B636B;          /* storm-cloud darkened for AA on light */
  --heading: var(--naval);
  --accent: var(--resolute);
  --accent-text: #3E6B80;         /* resolute darkened for AA text on light */
  --border: rgba(47, 61, 76, 0.16);
  --shadow: 0 4px 14px rgba(47, 61, 76, 0.08);
  --nav-bg: var(--naval);
  --nav-text: var(--bone-white);
  --btn-bg: var(--naval);
  --btn-text: var(--pure-white);
  --footer-bg: var(--dried-thyme);
  --footer-text: #1F2933;
  --focus: #1F6FEB;
  color-scheme: light;

  --font-text: 'Sitka Text', Georgia, 'Times New Roman', serif;
  --font-head: 'Sitka Heading', 'Sitka Text', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --nav-w: 260px;
}

/* Dark tokens: applied by OS preference unless user forced light, or by explicit choice */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1B232B;
    --surface: #26313C;
    --surface-tint: rgba(133, 176, 196, 0.12);
    --text: var(--bone-white);
    --text-muted: #AEB7BF;
    --heading: #F3F1ED;
    --accent: var(--resolute);
    --accent-text: var(--resolute);
    --border: rgba(237, 234, 229, 0.16);
    --shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
    --nav-bg: #141B22;
    --nav-text: var(--bone-white);
    --btn-bg: var(--resolute);
    --btn-text: #14212B;
    --footer-bg: #222B33;
    --footer-text: var(--bone-white);
    --focus: #8CB8FF;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #1B232B;
  --surface: #26313C;
  --surface-tint: rgba(133, 176, 196, 0.12);
  --text: var(--bone-white);
  --text-muted: #AEB7BF;
  --heading: #F3F1ED;
  --accent: var(--resolute);
  --accent-text: var(--resolute);
  --border: rgba(237, 234, 229, 0.16);
  --shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  --nav-bg: #141B22;
  --nav-text: var(--bone-white);
  --btn-bg: var(--resolute);
  --btn-text: #14212B;
  --footer-bg: #222B33;
  --footer-text: var(--bone-white);
  --focus: #8CB8FF;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.7;
  background: var(--bg);
  color: var(--text);
}

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

.skip-link {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--btn-bg); color: var(--btn-text);
  padding: .6rem 1rem; text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* ---------- Navigation ---------- */
.main-nav {
  width: var(--nav-w);
  position: fixed; inset: 0 auto 0 0;
  display: flex; flex-direction: column;
  background: var(--nav-bg);
  border-right: 3px solid var(--resolute);
  overflow-y: auto;
  z-index: 50;
}
.logo {
  display: block;
  padding: 2rem;
  font-family: var(--font-head);
  font-weight: 800; font-size: 1.5rem;
  color: #fff; text-decoration: none;
  border-bottom: 1px solid rgba(133, 176, 196, 0.2);
  margin-bottom: 1rem;
}
.logo span { color: var(--resolute); }

.nav-links { display: flex; flex-direction: column; }
.nav-links a {
  color: var(--nav-text);
  text-decoration: none;
  padding: 1rem 2rem;
  font-size: .95rem;
  border-left: 5px solid transparent;
  transition: background .2s, color .2s;
}
.nav-links a:hover { background: var(--resolute); color: var(--naval); }
.nav-links a[aria-current="page"] {
  background: rgba(133, 176, 196, 0.15);
  color: var(--resolute);
  border-left-color: var(--resolute);
  font-weight: 700;
}
.nav-links a[aria-current="page"]:hover { color: var(--naval); background: var(--resolute); }

.nav-tools {
  margin-top: auto;
  padding: 1.5rem 2rem;
  display: flex; gap: .75rem; align-items: center; flex-wrap: wrap;
  border-top: 1px solid rgba(133, 176, 196, 0.2);
}
.nav-tools a, .nav-tools button {
  font: inherit; font-size: .85rem;
  color: var(--nav-text);
  background: transparent;
  border: 1px solid rgba(133, 176, 196, 0.5);
  padding: .4rem .8rem; cursor: pointer; text-decoration: none;
}
.nav-tools a:hover, .nav-tools button:hover { background: var(--resolute); color: var(--naval); }
.nav-tools form { margin: 0; }

.nav-toggle {
  display: none;
  background: none; border: 1px solid rgba(133, 176, 196, .6);
  color: var(--nav-text); font: inherit; padding: .4rem .8rem; cursor: pointer;
}

/* ---------- Layout ---------- */
.content-wrapper {
  margin-left: var(--nav-w);
  width: calc(100% - var(--nav-w));
  display: flex; flex-direction: column; min-height: 100vh;
}
main { flex: 1; }
.section { padding: clamp(2rem, 4vw, 3.5rem) clamp(1.25rem, 6vw, 8%); }
/* Stacked sections share one gap instead of doubling their padding; heroes keep more breathing room. */
.section:not(.hero) + .section { padding-top: 0; }
.section.hero { padding-block: clamp(3rem, 6vw, 5rem); }
.section > .quote:first-child { margin-top: 0; }
.measure { max-width: 800px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600; color: var(--heading);
  line-height: 1.2; margin: 0 0 1rem;
}
h1 { font-size: clamp(2rem, 4vw + .5rem, 2.8rem); }
h2 { font-size: clamp(1.5rem, 2.5vw + .5rem, 2rem); }
h3 { font-size: 1.3rem; }
h1.underlined { display: inline-block; border-bottom: 2px solid var(--resolute); padding-bottom: .3rem; margin-bottom: 1.5rem; }
p { margin: 0 0 1.2rem; max-width: 75ch; }
.lede { font-size: 1.2rem; color: var(--text-muted); }
.eyebrow {
  display: block; margin-bottom: 1rem;
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .06em;
  color: var(--accent-text);
}
a { color: var(--accent-text); }

/* ---------- Components ---------- */
.hero { background: var(--naval); color: #fff; }
.hero h1 { color: #fff; }
.hero p { color: var(--bone-white); }
:root[data-theme="dark"] .hero { background: #2A3846; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .hero { background: #2A3846; } }

.btn {
  display: inline-block; font: inherit; font-weight: 700;
  padding: .75rem 1.5rem; margin-top: 1rem;
  background: var(--btn-bg); color: var(--btn-text);
  border: 0; cursor: pointer; text-decoration: none;
  transition: transform .15s, filter .15s;
}
.btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.hero .btn { background: var(--resolute); color: #14212B; }

.grid { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.card {
  background: var(--surface);
  padding: 2rem;
  border-top: 5px solid var(--naval);
  box-shadow: var(--shadow);
}
:root[data-theme="dark"] .card { border-top-color: var(--resolute); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .card { border-top-color: var(--resolute); } }
.card h3 { margin-top: 0; }
.card p { font-size: .95rem; }
.card .metric { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }

.quote {
  padding: 1.5rem 2rem; margin: 2rem 0;
  background: var(--surface-tint);
  border-left: 4px solid var(--resolute);
  font-style: italic; color: var(--heading);
}
.quote p { margin: 0; color: inherit; }

.split { display: flex; gap: 4rem; flex-wrap: wrap; align-items: flex-start; }
.split > * { flex: 1 1 300px; }
.split > .wide { flex: 2 1 300px; }

.portrait { width: 100%; height: auto; border-radius: 4px; border: 1px solid var(--resolute); display: block; }
figure { margin: 0; }
.figure-art { width: 100%; max-width: 800px; height: auto; margin-top: 2rem; display: block; }

ul.mantras { list-style: none; padding: 0; }
ul.mantras li { margin-bottom: 1rem; }

/* ---------- Forms ---------- */
.panel { background: var(--naval); color: #fff; padding: clamp(1.5rem, 4vw, 3rem); }
:root[data-theme="dark"] .panel { background: var(--surface); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .panel { background: var(--surface); } }
.panel h2, .panel p { color: #fff; }
.form { display: flex; flex-direction: column; gap: 1.25rem; }
.form label {
  display: block; margin-bottom: .4rem;
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .05em;
  color: var(--resolute);
}
.form input, .form textarea {
  width: 100%; font: inherit; padding: .8rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(133, 176, 196, 0.5);
  color: #fff; border-radius: 0;
}
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,.6); }
.form .btn { background: var(--resolute); color: #14212B; margin-top: 0; }
.hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }
.notice { padding: 1rem 1.25rem; margin-bottom: 1.5rem; border-left: 4px solid var(--resolute); background: var(--surface-tint); }
.notice.error { border-left-color: #C0392B; }
.panel .notice { color: #fff; }

.auth-box { max-width: 460px; }
table.data { width: 100%; border-collapse: collapse; background: var(--surface); box-shadow: var(--shadow); }
table.data th, table.data td { text-align: left; padding: .75rem 1rem; border-bottom: 1px solid var(--border); font-size: .95rem; }
table.data th { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .05em; color: var(--accent-text); }
.table-scroll { overflow-x: auto; }
code.link { word-break: break-all; font-family: var(--font-mono); font-size: .85rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--footer-bg); color: var(--footer-text); padding: 2rem clamp(1.25rem, 6vw, 8%); border-top: 1px solid var(--border); }
.site-footer p { color: inherit; margin: 0 0 .4rem; }

/* ---------- Mobile: sidebar becomes a top bar + drawer ---------- */
@media (max-width: 900px) {
  body { display: block; }
  .main-nav {
    position: sticky; top: 0; width: 100%; height: auto; inset: auto;
    flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between;
    border-right: 0; border-bottom: 3px solid var(--resolute);
    overflow: visible;
  }
  .logo { padding: 1rem 1.25rem; margin: 0; border: 0; font-size: 1.25rem; }
  .nav-toggle { display: inline-block; margin-right: 1.25rem; }
  .nav-links, .nav-tools { display: none; width: 100%; }
  .main-nav.open .nav-links, .main-nav.open .nav-tools { display: flex; }
  .nav-links a { padding: .9rem 1.25rem; }
  .nav-tools { padding: 1rem 1.25rem; margin-top: 0; }
  .content-wrapper { margin-left: 0; width: 100%; min-height: 0; }
  .split { gap: 2rem; }
}
/* No-JS: keep nav visible on small screens */
.no-js .nav-toggle { display: none; }
.no-js .main-nav .nav-links, .no-js .main-nav .nav-tools { display: flex; }

.hero .eyebrow { color: var(--resolute); }
.hero .lede { color: var(--bone-white); }
.btn { margin-right: .75rem; }
.content-wrapper, main { min-width: 0; }
img, svg { max-width: 100%; }

/* ---------- Additions ---------- */
.form select { width: 100%; font: inherit; padding: .8rem; background: rgba(255,255,255,.1); border: 1px solid rgba(133,176,196,.5); color: #fff; border-radius: 0; }
.form select option { color: #14212B; }
.gap-top { margin-top: 3rem; }
.btn-small { padding: .35rem .8rem; margin: 0; font-size: .85rem; }
.site-footer a { color: inherit; }

/* ---------- Governance: framework pinwheel ---------- */
.pinwheel-wrap { display: flex; gap: clamp(1.5rem, 5vw, 4rem); align-items: center; flex-wrap: wrap; margin: 2.5rem 0 3rem; }
.pinwheel { width: min(100%, 380px); height: auto; flex: 0 0 auto; }
.pinwheel-copy { flex: 1 1 300px; }
.petal { transition: filter .2s; stroke: rgba(255,255,255,.35); stroke-width: 1; }
.petal-link:hover .petal, .petal-link:focus-visible .petal { filter: brightness(1.25); }
.petal-link:focus-visible { outline: none; }
.petal-link:focus-visible .petal { stroke: var(--focus); stroke-width: 3; }
.petal-num { fill: #fff; paint-order: stroke; stroke: rgba(0,0,0,.45); stroke-width: 2.5px; stroke-linejoin: round; font-family: var(--font-mono); font-size: 15px; font-weight: 700; pointer-events: none; }
.pinwheel-hub { fill: var(--surface); stroke: var(--border); stroke-width: 2; }
.pinwheel-hub-text { fill: var(--heading); font-family: var(--font-head); font-weight: 700; font-size: 15px; letter-spacing: .08em; }
ul.themes { padding-left: 1.2rem; }
ul.themes li { margin-bottom: .4rem; }
.spoke { scroll-margin-top: 5.5rem; }
.spoke:target { box-shadow: 0 0 0 3px var(--focus), var(--shadow); }
.spoke-206 { border-top-color: hsl(206, 62%, 38%); }
.spoke-262 { border-top-color: hsl(262, 62%, 38%); }
.spoke-168 { border-top-color: hsl(168, 62%, 38%); }
.spoke-32 { border-top-color: hsl(32, 62%, 38%); }
.spoke-150 { border-top-color: hsl(150, 62%, 38%); }
.spoke-12 { border-top-color: hsl(12, 62%, 38%); }
.spoke-288 { border-top-color: hsl(288, 62%, 38%); }
.spoke-188 { border-top-color: hsl(188, 62%, 38%); }
.spoke-46 { border-top-color: hsl(46, 62%, 38%); }
:root[data-theme="dark"] .spoke-206 { border-top-color: hsl(206, 62%, 58%); }
:root[data-theme="dark"] .spoke-262 { border-top-color: hsl(262, 62%, 58%); }
:root[data-theme="dark"] .spoke-168 { border-top-color: hsl(168, 62%, 58%); }
:root[data-theme="dark"] .spoke-32 { border-top-color: hsl(32, 62%, 58%); }
:root[data-theme="dark"] .spoke-150 { border-top-color: hsl(150, 62%, 58%); }
:root[data-theme="dark"] .spoke-12 { border-top-color: hsl(12, 62%, 58%); }
:root[data-theme="dark"] .spoke-288 { border-top-color: hsl(288, 62%, 58%); }
:root[data-theme="dark"] .spoke-188 { border-top-color: hsl(188, 62%, 58%); }
:root[data-theme="dark"] .spoke-46 { border-top-color: hsl(46, 62%, 58%); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-206 { border-top-color: hsl(206, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-262 { border-top-color: hsl(262, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-168 { border-top-color: hsl(168, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-32 { border-top-color: hsl(32, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-150 { border-top-color: hsl(150, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-12 { border-top-color: hsl(12, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-288 { border-top-color: hsl(288, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-188 { border-top-color: hsl(188, 62%, 58%); } }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .spoke-46 { border-top-color: hsl(46, 62%, 58%); } }

.theme-group { margin-top: 3rem; }
.theme-group h2 { margin-bottom: .25rem; scroll-margin-top: 5.5rem; }
.theme-intro { color: var(--text-muted); margin-bottom: 1.5rem; }

.card.pillar.covered { border-top-style: dashed; background: var(--surface-tint); box-shadow: none; }
#ai-governance { margin-top: 2.5rem; }
.theme-group.delivered { margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--border); }

.testimonial { margin: 0; }
.testimonial blockquote { margin: 0 0 1rem; font-style: italic; font-size: 1.05rem; }
.testimonial blockquote p { color: var(--text); }
.testimonial figcaption { font-size: .9rem; color: var(--text-muted); }

/* Exactly two columns (e.g. a 2x2 set of four cards), single column on narrow screens */
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 700px) { .grid.two { grid-template-columns: 1fr; } }