/* ==========================================================================
   PSDP marketing site — design system
   Spec: docs/superpowers/specs/2026-06-12-marketing-site-redesign-design.md §3
   Hand-rolled, no framework. Light theme, dark footer. Mobile-first.
   All fg/bg pairs verified WCAG AA (ratios noted inline where non-obvious).
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Self-hosted fonts (GDPR: no third-party font requests)
   -------------------------------------------------------------------------- */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("fonts/inter-latin-wght-normal.woff2") format("woff2-variations"),
    url("fonts/inter-latin-wght-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin-600-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* --------------------------------------------------------------------------
   2. Design tokens
   -------------------------------------------------------------------------- */

:root {
  /* Palette (spec §3) */
  --ink: #0b1220;            /* primary text; 18.7:1 on paper */
  --paper: #ffffff;
  --surface: #f6f7f4;
  --border: #e3e5dd;         /* decorative borders only */
  --border-strong: #767e8c;  /* form-control borders; 4.1:1 on paper (≥3:1 non-text) */
  --accent: #1e5b4a;         /* deep green; 7.9:1 on paper */
  --accent-hover: #174636;
  --accent-tint: #e4f0ea;    /* accent text on tint: 6.8:1 */
  --amber: #8a5a10;          /* 5.9:1 on paper */
  --amber-tint: #fbf1de;     /* amber on tint: 5.3:1 */
  --red: #8c1d1d;            /* 9.1:1 on paper */
  --red-tint: #faeaea;       /* red on tint: 7.8:1 */
  --muted: #49525f;          /* secondary text; 7.9:1 on paper */
  --slate: #0b1220;          /* footer bg */
  --slate-text: #9aa3ad;     /* 7.3:1 on slate */
  --slate-accent: #7fb8a4;   /* accent for dark bg; 8.3:1 on slate */
  --code-bg: #0f1726;
  --code-text: #d7dee8;      /* 13.2:1 on code-bg */
  --code-green: #7fd8b5;     /* 10.6:1 on code-bg */

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Courier New", monospace;
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: clamp(1.25rem, 1.16rem + 0.36vw, 1.4375rem);   /* 20→23px */
  --text-2xl: clamp(1.375rem, 1.24rem + 0.61vw, 1.75rem);   /* 22→28px */
  --text-3xl: clamp(1.75rem, 1.41rem + 1.45vw, 2.5rem);     /* 28→40px */
  --text-display: clamp(2.5rem, 1.82rem + 2.91vw, 4rem);    /* 40→64px fluid */

  /* Spacing — 8px scale */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;

  /* Layout */
  --container: 75rem;        /* 1200px */
  --gutter: clamp(1rem, 0.5rem + 2.5vw, 2rem);
  --grid-gap: clamp(1rem, 0.75rem + 1vw, 1.5rem);
  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(11, 18, 32, 0.06);
  --shadow-md: 0 4px 16px rgba(11, 18, 32, 0.08);
  --nav-height: 4rem;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --dur: 180ms;
}

/* --------------------------------------------------------------------------
   3. Reset
   -------------------------------------------------------------------------- */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 1rem);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
}

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(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* #main is a programmatic skip-link target (tabindex="-1"); it must receive
   focus for Bypass Blocks but should not paint a full-width focus ring. */
main:focus {
  outline: none;
}

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

/* --------------------------------------------------------------------------
   4. Typography
   -------------------------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1,
.display {
  font-size: var(--text-display);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

.lede {
  font-size: var(--text-xl);
  line-height: 1.5;
  color: var(--muted);
  max-width: 42em;
  text-wrap: pretty;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: var(--text-sm);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

/* Inline code on light backgrounds */
:not(pre) > code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--sp-6) 0;
}

/* Section kicker — mono uppercase letterspaced accent (spec §3) */
.kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--sp-3);
}

/* --------------------------------------------------------------------------
   5. Layout: container, sections, 12-col grid
   -------------------------------------------------------------------------- */

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

.section {
  padding-block: clamp(var(--sp-7), 4vw + 1.5rem, var(--sp-9));
}

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

.section-head {
  max-width: 46em;
  margin-bottom: var(--sp-6);
}

.section-head > h2 {
  margin-bottom: var(--sp-3);
}

/* 12-col grid: single column on mobile, spans apply from 48em (768px) up */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--grid-gap);
}

.grid > * {
  grid-column: 1 / -1;
}

@media (min-width: 48em) {
  .col-1 { grid-column: span 1; }
  .col-2 { grid-column: span 2; }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-9 { grid-column: span 9; }
  .col-10 { grid-column: span 10; }
  .col-11 { grid-column: span 11; }
  .col-12 { grid-column: span 12; }
}

/* Half-step for mid-size tablets: pairs below 48em */
@media (min-width: 36em) and (max-width: 47.99em) {
  .col-3,
  .col-4,
  .col-6 { grid-column: span 6; }
}

.stack > * + * {
  margin-top: var(--sp-4);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  align-items: center;
}

/* --------------------------------------------------------------------------
   6. Sticky top nav
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: #fff;
  padding: var(--sp-2) var(--sp-4);
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
  color: #fff;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  min-height: var(--nav-height);
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

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

.site-nav__brand svg {
  width: 28px;
  height: 28px;
  flex: none;
}

.site-nav__links {
  display: none;
  align-items: center;
  gap: var(--sp-5);
  margin: 0;
}

.site-nav__links a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--sp-1) 0;
  border-bottom: 2px solid transparent;
}

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

.site-nav__links a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.site-nav .site-nav__cta {
  display: none;
}

/* Hamburger */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: background var(--dur) var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__bars::before {
  top: -6px;
}

.nav-toggle__bars::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu panel */
.site-nav__mobile {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--paper);
  padding: var(--sp-4) var(--gutter) var(--sp-5);
}

.site-nav__mobile.is-open {
  display: block;
}

.site-nav__mobile ul {
  display: grid;
  gap: var(--sp-1);
  margin: 0 0 var(--sp-4);
  list-style: none;
  padding: 0;
}

.site-nav__mobile a:not(.btn) {
  display: block;
  padding: var(--sp-3) var(--sp-2);
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.site-nav__mobile a:not(.btn):hover {
  background: var(--surface);
  color: var(--accent);
}

.site-nav__mobile a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-tint);
}

@media (min-width: 56em) {
  .site-nav__links {
    display: flex;
  }

  .site-nav .site-nav__cta {
    display: inline-flex;
  }

  .nav-toggle,
  .site-nav__mobile {
    display: none !important;
  }
}

/* --------------------------------------------------------------------------
   7. Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.2;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--accent);
  color: #fff;                /* 7.9:1 on accent */
  border-color: var(--accent);
}

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

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

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-tint);
}

.btn--lg {
  padding: 0.9375rem 1.75rem;
  font-size: 1.0625rem;
}

.btn--sm {
  padding: 0.4375rem 0.875rem;
  font-size: var(--text-sm);
}

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   8. Cards
   -------------------------------------------------------------------------- */

.card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--sp-5);
  box-shadow: var(--shadow-sm);
}

.card > h3,
.card > h4 {
  margin-bottom: var(--sp-2);
}

.card > p {
  color: var(--muted);
}

.card > p + p {
  margin-top: var(--sp-3);
}

.card--link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.card--link:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: inherit;
}

.card__foot {
  margin-top: var(--sp-4);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm);
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   9. Proof-stat blocks — mono number + footnote link (spec §3)
   -------------------------------------------------------------------------- */

.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--paper);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.stat__value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.75rem, 1.3rem + 1.9vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.stat__value em {
  font-style: normal;
  color: var(--accent);
}

.stat__label {
  font-weight: 600;
  font-size: 0.9375rem;
}

.stat__note {
  font-size: var(--text-sm);
  color: var(--muted);
}

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

/* --------------------------------------------------------------------------
   10. Evidence tables
   -------------------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  -webkit-overflow-scrolling: touch;
  /* Horizontal-scroll affordance: an edge shadow appears on whichever side has
     more table off-screen and recedes as you reach that end. The two opaque
     "cover" layers scroll with the content (background-attachment: local) and
     mask the fixed shadow layers until there is real overflow — so the hint is
     shown only when the table actually scrolls. (Lea Verou scroll-shadow.) */
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--paper) 30%, rgba(255, 255, 255, 0)),
    linear-gradient(to left, var(--paper) 30%, rgba(255, 255, 255, 0)),
    radial-gradient(farthest-side at left center, rgba(11, 18, 32, 0.16), rgba(11, 18, 32, 0)),
    radial-gradient(farthest-side at right center, rgba(11, 18, 32, 0.16), rgba(11, 18, 32, 0));
  background-position: left center, right center, left center, right center;
  background-repeat: no-repeat;
  background-size: 44px 100%, 44px 100%, 16px 100%, 16px 100%;
  background-attachment: local, local, scroll, scroll;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
}

.table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-align: left;
  color: var(--muted);
  background: var(--surface);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.table td {
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.table tbody tr:last-child td {
  border-bottom: 0;
}

.table tbody tr:hover {
  background: var(--surface);
}

.table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* --------------------------------------------------------------------------
   11. Badge chips — PASS / PARTIAL / FAIL (spec §3)
   -------------------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1;
  padding: 0.375rem 0.625rem;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge::before {
  content: "";
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

.badge--pass {
  color: var(--accent);          /* 6.8:1 on tint */
  background: var(--accent-tint);
  border-color: #c2ddd2;
}

.badge--partial {
  color: var(--amber);           /* 5.3:1 on tint */
  background: var(--amber-tint);
  border-color: #ecd9b4;
}

.badge--fail {
  color: var(--red);             /* 7.8:1 on tint */
  background: var(--red-tint);
  border-color: #efc9c9;
}

.badge--neutral {
  color: var(--muted);           /* 7.4:1 on surface */
  background: var(--surface);
  border-color: var(--border);
}

/* --------------------------------------------------------------------------
   12. Terminal / code blocks with copy affordance
   -------------------------------------------------------------------------- */

.terminal {
  background: var(--code-bg);
  border-radius: var(--radius);
  border: 1px solid #232d40;
  overflow: hidden;
  font-size: var(--text-sm);
}

.terminal__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3) var(--sp-2) var(--sp-4);
  border-bottom: 1px solid #232d40;
}

.terminal__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8b96a5;               /* 6.2:1 on code-bg */
}

.terminal pre {
  margin: 0;
  padding: var(--sp-4);
  overflow-x: auto;
  color: var(--code-text);
  line-height: 1.55;
}

.terminal code {
  font-size: 0.8125rem;
  background: none;
  border: 0;
  padding: 0;
}

.terminal .prompt {
  color: var(--code-green);
  user-select: none;
}

.terminal .out {
  color: #8b96a5;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--code-text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid #2e3a52;
  border-radius: var(--radius-sm);
  padding: 0.3125rem 0.625rem;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.copy-btn:focus-visible {
  outline-color: var(--code-green);
}

.copy-btn.is-copied {
  color: var(--code-green);
  border-color: var(--code-green);
}

/* no-JS: hide copy buttons (clipboard needs JS) */
.no-js .copy-btn {
  display: none;
}

/* --------------------------------------------------------------------------
   13. "Scope & limits" honesty callout (spec §3 — on every product page)
   -------------------------------------------------------------------------- */

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: var(--sp-5);
}

.callout__title {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: var(--sp-3);
}

.callout__title svg {
  width: 16px;
  height: 16px;
  flex: none;
}

.callout ul {
  margin: 0;
  padding-left: 1.1em;
  color: var(--ink);
}

.callout li + li {
  margin-top: var(--sp-2);
}

.callout--warn {
  border-left-color: var(--amber);
}

.callout--warn .callout__title {
  color: var(--amber);
}

/* --------------------------------------------------------------------------
   14. Forms — fields, validation, success / error states
   -------------------------------------------------------------------------- */

.form {
  display: grid;
  gap: var(--sp-4);
}

.field {
  display: grid;
  gap: var(--sp-2);
}

.field > label {
  font-weight: 600;
  font-size: 0.9375rem;
}

.field__hint {
  font-size: var(--text-sm);
  color: var(--muted);
}

.field > input,
.field > textarea,
.field > select {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--border-strong);  /* 4.1:1 non-text contrast */
  border-radius: var(--radius-sm);
  padding: 0.6875rem 0.875rem;
  font-size: var(--text-base);
  color: var(--ink);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

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

.field > input::placeholder,
.field > textarea::placeholder {
  color: #5b6470;               /* 6.0:1 on paper */
}

.field > input:focus,
.field > textarea:focus,
.field > select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-tint);
}

.field.has-error > input,
.field.has-error > textarea,
.field.has-error > select {
  border-color: var(--red);
}

.field__error {
  display: none;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--red);
}

.field.has-error .field__error {
  display: block;
}

/* Honeypot — visually removed, still focusable-by-bots */
.hp-field {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Form status banners */
.form-status {
  display: none;
  border-radius: var(--radius-sm);
  padding: var(--sp-4);
  font-size: 0.9375rem;
  font-weight: 500;
}

.form-status.is-visible {
  display: block;
}

.form-status--success {
  background: var(--accent-tint);
  border: 1px solid #c2ddd2;
  color: var(--accent);          /* 6.8:1 */
}

.form-status--error {
  background: var(--red-tint);
  border: 1px solid #efc9c9;
  color: var(--red);             /* 7.8:1 */
}

.form-status--pending {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   14b. Age-verification demo widget (real ZK) — status spinner + result
   -------------------------------------------------------------------------- */

.age-zk__status {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--muted);
}

/* `display: flex` above outranks the UA `[hidden] { display: none }`; restore
   it so an empty status region truly collapses until a proof is in flight. */
.age-zk__status[hidden] {
  display: none;
}

.age-zk__spinner {
  flex: none;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: age-zk-spin 0.8s linear infinite;
}

@keyframes age-zk-spin {
  to {
    transform: rotate(360deg);
  }
}

.age-zk__result {
  margin-top: var(--sp-4);
  padding: var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.age-zk__result > .badge {
  margin-bottom: var(--sp-3);
}

.age-zk__result > p {
  margin: 0;
}

.age-zk__result > p + p {
  margin-top: var(--sp-2);
}

/* --------------------------------------------------------------------------
   14c. Multi-factor step-up demo widget (real WebAuthn passkey)
   Shares the age-zk visual treatment; reuses the @keyframes age-zk-spin above.
   -------------------------------------------------------------------------- */

.mfa__status {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--muted);
}

/* `display: flex` above outranks the UA `[hidden] { display: none }`; restore
   it so an empty status region truly collapses until there is something to say. */
.mfa__status[hidden] {
  display: none;
}

.mfa__spinner {
  flex: none;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: age-zk-spin 0.8s linear infinite;
}

.mfa__result {
  margin-top: var(--sp-4);
  padding: var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.mfa__result > .badge {
  margin-bottom: var(--sp-3);
}

.mfa__result p {
  margin: 0;
}

.mfa__result p + p {
  margin-top: var(--sp-2);
}

.mfa__vector {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}

.mfa__arrow {
  color: var(--muted);
  font-weight: 600;
}

.mfa__unsupported {
  margin-top: var(--sp-3);
}

/* --------------------------------------------------------------------------
   14d. Same-you-two-sites unlinkability demo (real ZK) — status + side-by-side
   Reuses .age-zk__spinner / @keyframes age-zk-spin above.
   -------------------------------------------------------------------------- */

.unlink__status {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--muted);
}

.unlink__status[hidden] {
  display: none;
}

.unlink__result {
  margin-top: var(--sp-4);
}

.unlink__pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}

@media (max-width: 32rem) {
  .unlink__pair {
    grid-template-columns: 1fr;
  }
}

.unlink__site {
  padding: var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.unlink__site > .badge {
  margin-bottom: var(--sp-3);
}

.unlink__site p {
  margin: 0;
}

.unlink__label {
  margin-top: var(--sp-3) !important;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.6875rem;
}

.unlink__null {
  color: var(--accent);
  word-break: break-all;
}

.unlink__verdict {
  margin: var(--sp-4) 0 0;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: var(--text-sm);
  color: var(--ink);
}

.unlink__verdict.is-unlinkable {
  background: var(--accent-tint);
  border-color: #c2ddd2;
}

/* --------------------------------------------------------------------------
   14e. Capped-agent demo (key-bound metered delegation) — chain + attempts
   Reuses .age-zk__spinner / @keyframes age-zk-spin above.
   -------------------------------------------------------------------------- */

.agent-cap__status {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9375rem;
  color: var(--muted);
}

.agent-cap__status[hidden] {
  display: none;
}

.agent-cap__result {
  margin-top: var(--sp-4);
  padding: var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.agent-cap__result > p {
  margin: 0;
}

.agent-cap__result > p + * {
  margin-top: var(--sp-3);
}

.agent-cap__chain {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2) var(--sp-3);
  margin-top: var(--sp-2);
}

.agent-cap__node {
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--ink);
}

.agent-cap__arrow {
  color: var(--muted);
  font-weight: 600;
}

.agent-cap__attempts {
  display: grid;
  gap: var(--sp-2);
}

.agent-cap__attempt {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--paper);
  border: 1px solid var(--border);
}

.agent-cap__spend {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   15. SVG diagram container
   -------------------------------------------------------------------------- */

.diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(var(--sp-4), 3vw, var(--sp-6));
}

.diagram svg {
  width: 100%;
  height: auto;
}

.diagram figcaption {
  margin-top: var(--sp-4);
  font-size: var(--text-sm);
  color: var(--muted);
  text-align: center;
}

/* --------------------------------------------------------------------------
   16. Hero
   -------------------------------------------------------------------------- */

.hero {
  padding-block: clamp(var(--sp-7), 6vw, var(--sp-9));
  background:
    linear-gradient(180deg, var(--surface) 0%, var(--paper) 100%);
  border-bottom: 1px solid var(--border);
}

.hero__inner {
  /* This element also carries .container. Keep the full content width so the
     hero's left edge aligns with the section grid below it; the readable text
     measure is constrained per-element (h1 below, .lede via its own 42em).
     Previously max-width:52em collapsed the hero into a narrow centered box. */
  max-width: var(--container);
}

.hero h1 {
  margin-bottom: var(--sp-4);
  max-width: 52rem;   /* readable headline measure, left-aligned to the grid */
}

.hero .lede {
  margin-bottom: var(--sp-6);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

/* --------------------------------------------------------------------------
   17. Footer — dark slate, sitemap, honesty lines (spec §3)
   -------------------------------------------------------------------------- */

.site-footer {
  background: var(--slate);
  color: var(--slate-text);
  padding-block: var(--sp-8) var(--sp-6);
  font-size: 0.9375rem;
}

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

.site-footer a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.site-footer__grid {
  display: grid;
  gap: var(--sp-6);
  grid-template-columns: 1fr;
  margin-bottom: var(--sp-7);
}

@media (min-width: 36em) {
  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 56em) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: 1.125rem;
  color: #ffffff;
  text-decoration: none;
  margin-bottom: var(--sp-3);
}

.site-footer__brand svg {
  width: 26px;
  height: 26px;
}

.site-footer__tagline {
  max-width: 34em;
}

.site-footer h2,
.site-footer h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--slate-accent);    /* 8.3:1 on slate */
  margin-bottom: var(--sp-3);
}

.site-footer ul {
  display: grid;
  gap: var(--sp-2);
  margin: 0;
  list-style: none;
  padding: 0;
}

.site-footer__meta {
  border-top: 1px solid #232d40;
  padding-top: var(--sp-5);
  display: grid;
  gap: var(--sp-3);
  font-size: var(--text-sm);
}

.site-footer__privacy {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--slate-accent);
}

.site-footer__privacy svg {
  width: 14px;
  height: 14px;
  flex: none;
}

/* --------------------------------------------------------------------------
   18. Utilities
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.flow > * + * { margin-top: var(--sp-4); }

/* --------------------------------------------------------------------------
   19. Motion preferences
   -------------------------------------------------------------------------- */

@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;
  }

  .card--link:hover,
  .btn:active {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   20. Print
   -------------------------------------------------------------------------- */

@media print {
  .site-nav,
  .nav-toggle,
  .site-nav__mobile,
  .copy-btn,
  .skip-link,
  .hero__actions,
  .btn {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

  .site-footer {
    background: none;
    color: #000;
    border-top: 1px solid #000;
  }

  .site-footer a,
  .site-footer h2,
  .site-footer h3,
  .site-footer__privacy {
    color: #000;
  }

  .terminal {
    background: none;
    border: 1px solid #000;
  }

  .terminal pre,
  .terminal code,
  .terminal__title,
  .terminal .prompt,
  .terminal .out {
    color: #000;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #444;
  }

  .card,
  .stat,
  .callout,
  .table-wrap,
  .diagram {
    box-shadow: none;
    break-inside: avoid;
  }
}