:root {
  /* ---- palette ---- */
  --bg: #FBF9F5;
  --surface: #FFFFFF;
  --ink: #191B23;
  --muted: #55596B;
  --accent: #1F4ED8;
  --accent-contrast: #FFFFFF;

  /* ---- derived surfaces & rules ---- */
  --rule: #E4DFD4;
  --rule-strong: #C8C2B4;
  --accent-wash: #EDF1FD;
  --ink-block: #191B23;
  --ink-block-text: #F6F4EF;
  --ink-block-muted: #B6B9C6;

  /* ---- type ---- */
  --font-head: "Segoe UI Semibold", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;

  --step--1: 0.8125rem;
  --step-0: 1.0625rem;
  --step-1: 1.1875rem;
  --step-2: clamp(1.3rem, 1.1rem + 0.7vw, 1.6rem);
  --step-3: clamp(1.6rem, 1.3rem + 1.4vw, 2.2rem);
  --step-4: clamp(2.05rem, 1.5rem + 2.6vw, 3.25rem);

  /* ---- rhythm ---- */
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1.25rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: clamp(3.25rem, 7vw, 5.75rem);

  --container: 69rem;
  --r: 3px;
  --r-lg: 6px;
  --ring: 0 0 0 3px rgba(31, 78, 216, 0.28);
}

/* ============================================================
   RESET / BASE
   ============================================================ */

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

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

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(to bottom, rgba(25, 27, 35, 0.045) 1px, transparent 1px);
  background-size: 100% 2.25rem;
  background-position: 0 -1px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  text-underline-offset: 0.18em;
}

main { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 var(--space-3);
  text-wrap: balance;
}

h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); letter-spacing: -0.01em; }
h4 { font-size: var(--step-1); }

p, ul, ol, dl, blockquote, figure, table {
  margin: 0 0 var(--space-3);
}

p { max-width: 62ch; text-wrap: pretty; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
}
a:hover { text-decoration-thickness: 2px; }

strong { font-weight: 700; }

small { font-size: var(--step--1); }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--accent-wash);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--space-5) 0;
}

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

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

::selection {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* ============================================================
   LAYOUT
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.15rem, 4vw, 2.5rem);
}

/* ============================================================
   HEADER + NAV
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: 0.7rem;
}

.brand {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding-block: 0.2rem;
  flex: 0 0 auto;
}

.brand::before {
  content: "";
  width: 0.7rem;
  height: 0.7rem;
  background: var(--accent);
  border-radius: 2px;
  transform: rotate(45deg);
  flex: 0 0 auto;
}

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

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.35rem;
  margin-inline-start: auto;
}

.site-nav a {
  display: inline-block;
  padding: 0.4rem 0.6rem;
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  border-radius: var(--r);
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
  background: var(--accent-wash);
}

.site-nav a.is-current {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ============================================================
   SECTIONS
   ============================================================ */

.hero {
  padding-block: clamp(3rem, 8vw, 6rem) var(--space-6);
  border-bottom: 1px solid var(--rule);
  background-image:
    radial-gradient(60rem 22rem at 12% -10%, var(--accent-wash), transparent 70%);
}

.hero h1 {
  max-width: 24ch;
  margin-bottom: var(--space-3);
}

.hero > .container > p {
  font-size: var(--step-1);
  color: var(--muted);
  max-width: 54ch;
}

.hero > .container > p:first-of-type {
  position: relative;
  padding-left: var(--space-3);
  border-left: 2px solid var(--accent);
  color: var(--ink);
}

.section { padding-block: var(--space-6); }

.section-alt {
  background: var(--surface);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.section > .container > h2,
.section > .container > h3 { max-width: 34ch; }

.section > .container > h2 {
  position: relative;
  padding-top: var(--space-3);
  margin-bottom: var(--space-4);
}

.section > .container > h2::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2.5rem;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.section > .container > p + h3 { margin-top: var(--space-5); }

/* generic in-page lists */
main ul:not(.card-grid),
main ol {
  padding-left: 1.15rem;
  max-width: 62ch;
}

main ul:not(.card-grid) li,
main ol li { margin-bottom: var(--space-1); }

main ul:not(.card-grid) li::marker { color: var(--accent); }
main ol li::marker { color: var(--accent); font-variant-numeric: tabular-nums; }

/* ============================================================
   CARDS
   ============================================================ */

.card-grid {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  counter-reset: card;
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  padding: var(--space-4) var(--space-3) var(--space-3);
  box-shadow: 0 1px 0 var(--rule);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.card::before {
  counter-increment: card;
  content: counter(card, decimal-leading-zero);
  position: absolute;
  top: var(--space-2);
  left: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.card h3 {
  margin-bottom: var(--space-2);
  font-size: var(--step-1);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9875rem;
}

.card p + p { margin-top: var(--space-2); }

.card:hover {
  transform: translateY(-2px);
  border-color: var(--rule-strong);
  box-shadow: 0 8px 22px -14px rgba(25, 27, 35, 0.45);
}

.card a { font-weight: 600; }

.section-alt .card { background: var(--bg); }

/* ============================================================
   FACTS (ledger rows)
   ============================================================ */

.facts {
  display: grid;
  gap: var(--space-3) var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  margin: var(--space-4) 0 0;
}

.fact {
  border-top: 2px solid var(--ink);
  padding-top: var(--space-2);
}

.fact dt {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.fact dd {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--step-2);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.fact:first-child { border-top-color: var(--accent); }

/* ============================================================
   BUTTONS
   ============================================================ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.6rem 1.35rem;
  font-family: var(--font-head);
  font-size: 0.9875rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  text-decoration: none;
  border: 1.5px solid transparent;
  border-radius: var(--r);
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, color 140ms ease,
    border-color 140ms ease, box-shadow 140ms ease;
}

.button + .button { margin-left: 0.5rem; }

.button-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
  box-shadow: 0 6px 16px -12px rgba(31, 78, 216, 0.9);
}

.button-primary:hover {
  background: color-mix(in srgb, var(--accent) 86%, var(--ink));
  border-color: color-mix(in srgb, var(--accent) 86%, var(--ink));
  transform: translateY(-1px);
}

.button-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-wash);
}

.button:active { transform: translateY(0); }

/* button rows sitting after text */
.hero .button,
.section .button,
.cta .button { margin-top: var(--space-2); }

/* ============================================================
   CTA (ink block)
   ============================================================ */

.cta {
  background: var(--ink-block);
  color: var(--ink-block-text);
  padding-block: clamp(2.75rem, 6vw, 4.5rem);
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 2.25rem 100%;
}

.cta h2 {
  color: var(--ink-block-text);
  max-width: 28ch;
}

.cta h2::before { display: none; }

.cta p {
  color: var(--ink-block-muted);
  max-width: 56ch;
}

.cta a:not(.button) { color: #BFD0FF; }

.cta .button-primary {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--bg);
  box-shadow: none;
}

.cta .button-primary:hover {
  background: #FFFFFF;
  border-color: #FFFFFF;
}

.cta .button-secondary {
  color: var(--ink-block-text);
  border-color: rgba(246, 244, 239, 0.4);
}

.cta .button-secondary:hover {
  background: rgba(246, 244, 239, 0.1);
  border-color: var(--ink-block-text);
  color: var(--ink-block-text);
}

/* ============================================================
   FORM
   ============================================================ */

.form {
  margin-top: var(--space-4);
  max-width: 34rem;
  display: grid;
  gap: var(--space-3);
}

.field { display: grid; gap: 0.35rem; }

.field label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--r);
  padding: 0.7rem 0.8rem;
  min-height: 2.9rem;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.field textarea {
  min-height: 8.5rem;
  resize: vertical;
  line-height: 1.55;
}

.field input::placeholder,
.field textarea::placeholder { color: color-mix(in srgb, var(--muted) 72%, transparent); }

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--ring);
}

.field small,
.field p {
  font-size: var(--step--1);
  color: var(--muted);
  margin: 0;
}

.form .button { justify-self: start; margin-top: var(--space-1); }

/* ============================================================
   QUOTE
   ============================================================ */

.quote {
  margin: var(--space-4) 0 0;
  padding: 0 0 0 var(--space-4);
  border-left: 3px solid var(--accent);
  max-width: 58ch;
}

.quote p {
  font-family: var(--font-head);
  font-size: var(--step-2);
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-2);
}

.quote p::before { content: "\201C"; }
.quote p::after { content: "\201D"; }

.quote cite {
  display: block;
  font-style: normal;
  font-size: var(--step--1);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.quote cite::before { content: "— "; }

.card-grid .quote { border-left-width: 2px; }

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--rule);
  padding-block: var(--space-5) var(--space-4);
  font-size: 0.9375rem;
  color: var(--muted);
}

.site-footer h2,
.site-footer h3 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink);
  margin-bottom: var(--space-2);
}

.site-footer p { max-width: 46ch; }

.site-footer a { color: var(--accent); }

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
}

.site-footer small { display: block; color: var(--muted); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 40rem) {
  body { background-size: 100% 2rem; }

  .header-inner { padding-block: 0.55rem; }

  .site-nav {
    width: 100%;
    margin-inline-start: 0;
    gap: 0.1rem 0.15rem;
    border-top: 1px solid var(--rule);
    padding-top: 0.35rem;
  }

  .site-nav a { padding: 0.45rem 0.5rem; }

  .button {
    width: 100%;
    margin-left: 0 !important;
  }

  .button + .button { margin-top: var(--space-2); }

  .quote { padding-left: var(--space-3); }
}

@media (min-width: 52rem) {
  .site-footer > .container {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-4);
    align-items: start;
  }

  .site-footer > .container > small,
  .site-footer > .container > p:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid var(--rule);
    padding-top: var(--space-3);
    margin: 0;
  }
}

/* ============================================================
   DARK MODE
   ============================================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161C;
    --surface: #1C1F28;
    --ink: #F2F1EE;
    --muted: #AFB3C2;
    --accent: #93AEFF;
    --accent-contrast: #10131A;
    --rule: #2C3140;
    --rule-strong: #414759;
    --accent-wash: #232941;
    --ink-block: #0F1116;
    --ink-block-text: #F2F1EE;
    --ink-block-muted: #A9AEBF;
    --ring: 0 0 0 3px rgba(147, 174, 255, 0.3);
  }

  body {
    background-image:
      linear-gradient(to bottom, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  }

  .hero {
    background-image:
      radial-gradient(60rem 22rem at 12% -10%, rgba(147, 174, 255, 0.13), transparent 70%);
  }

  .card { box-shadow: none; }

  .card:hover { box-shadow: 0 8px 22px -14px rgba(0, 0, 0, 0.8); }

  .button-primary {
    box-shadow: none;
    font-weight: 700;
  }

  .button-primary:hover {
    background: color-mix(in srgb, var(--accent) 82%, #FFFFFF);
    border-color: color-mix(in srgb, var(--accent) 82%, #FFFFFF);
  }

  .cta a:not(.button) { color: #BFD0FF; }

  .cta .button-primary {
    background: var(--accent);
    color: var(--accent-contrast);
    border-color: var(--accent);
  }
}

/* ============================================================
   MOTION / PRINT
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover,
  .button:hover { transform: none; }
}

@media print {
  body { background: #FFFFFF; color: #000000; }
  .site-header, .cta, .form { display: none; }
  .section, .hero { padding-block: 1.25rem; border: 0; }
  a { color: #000000; text-decoration: underline; }
}