/* ==========================================================================
   ClearStartAI — Core design system
   Tokens · reset · typography · layout · tone bands · components

   Brand palette derived from the ClearStartAI mark:
   deep blue #1B67AF · bright blue #259ACA · cyan #39C6C8 · mint #76DBB9
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Brand scale (theme-independent raw values)
   -------------------------------------------------------------------------- */

:root {
  /* Brand ramp — read off the logo gradient */
  --cs-blue-900: #0C3A66;
  --cs-blue-800: #12508F;
  --cs-blue-700: #1B67AF;   /* primary   */
  --cs-blue-600: #1E80BE;
  --cs-blue-500: #259ACA;   /* secondary */
  --cs-cyan-400: #39C6C8;   /* accent    */
  --cs-mint-300: #76DBB9;   /* mint      */
  --cs-mint-200: #A5E9D2;

  /* Ink ramp — deep navies tuned to the brand's blue hue */
  --cs-ink-950: #050A12;
  --cs-ink-900: #071120;
  --cs-ink-850: #0A1828;
  --cs-ink-800: #0E2033;
  --cs-ink-700: #16304A;
  --cs-ink-600: #22415F;

  /* Paper ramp — cool neutrals, same family as the ink */
  --cs-paper-000: #FFFFFF;
  --cs-paper-050: #F7F9FB;
  --cs-paper-100: #EFF3F7;
  --cs-paper-200: #E2E9F0;
  --cs-paper-300: #CBD6E1;

  --cs-slate-700: #3D4E63;
  --cs-slate-600: #52647B;
  --cs-slate-500: #6B7D95;

  /* Signature ClearStart gradient: deep blue -> blue -> cyan -> mint */
  --gradient-brand: linear-gradient(
    100deg,
    var(--cs-blue-700) 0%,
    var(--cs-blue-500) 34%,
    var(--cs-cyan-400) 68%,
    var(--cs-mint-300) 100%
  );

  /* ---- Type ---- */
  --font-display: "Schibsted Grotesk", "Segoe UI Variable Display", "Segoe UI",
    -apple-system, BlinkMacSystemFont, "SF Pro Display", Inter, system-ui, sans-serif;
  --font-sans: "Inter", "Segoe UI Variable Text", "Segoe UI", -apple-system,
    BlinkMacSystemFont, "SF Pro Text", Roboto, system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", "JetBrains Mono",
    "Fira Code", Consolas, monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.8125rem;
  --text-base: 0.9375rem;
  --text-md:   1.0625rem;
  --text-lg:   clamp(1.125rem, 0.4vw + 1.03rem, 1.3125rem);
  --text-xl:   clamp(1.3rem, 0.7vw + 1.14rem, 1.6rem);

  --display-4: clamp(1.5rem, 1.4vw + 1.18rem, 2rem);
  --display-3: clamp(1.75rem, 2.6vw + 1.16rem, 2.85rem);
  --display-2: clamp(2.1rem, 4.4vw + 1.1rem, 4.1rem);
  --display-1: clamp(2.6rem, 6.4vw + 0.9rem, 5.75rem);
  --display-0: clamp(2.9rem, 8vw + 0.6rem, 7.25rem);

  --leading-tight: 1.04;
  --leading-snug: 1.16;
  --leading-normal: 1.6;
  --leading-relaxed: 1.72;

  --tracking-display: -0.035em;
  --tracking-tight: -0.02em;
  --tracking-label: 0.14em;

  /* ---- Spacing (4px base) ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.5rem;
  --space-8: 3rem;
  --space-9: 4rem;
  --space-10: 5rem;
  --space-11: 6.5rem;
  --space-12: 8rem;

  --section-y: clamp(4.5rem, 8.5vw, 9rem);
  --section-y-lg: clamp(6rem, 11vw, 12rem);

  /* ---- Layout ---- */
  --container: 1280px;
  --container-narrow: 900px;
  --container-wide: 1560px;
  --gutter: clamp(1.25rem, 4.2vw, 3.5rem);
  --header-h: 76px;

  /* ---- Radius ---- */
  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-pill: 999px;

  /* ---- Motion ---- */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.66, 0, 0.34, 1);
  --dur-1: 160ms;
  --dur-2: 300ms;
  --dur-3: 520ms;
  --dur-4: 880ms;

  color-scheme: light;
}

/* --------------------------------------------------------------------------
   2. Tone bands
   Each band re-declares the same semantic tokens, so every component below is
   authored once and simply inherits whichever tone it sits in.
   -------------------------------------------------------------------------- */

.tone-paper,
.tone-mist,
.tone-ink {
  background-color: var(--color-background);
  color: var(--color-text-primary);
}

.tone-paper {
  --color-background: var(--cs-paper-000);
  --color-background-alt: var(--cs-paper-050);
  --color-surface: var(--cs-paper-050);
  --color-surface-raised: var(--cs-paper-000);
  --color-border: rgba(12, 58, 102, 0.14);
  --color-border-strong: rgba(12, 58, 102, 0.28);
  --color-text-primary: var(--cs-ink-900);
  --color-text-secondary: var(--cs-slate-600);
  --color-text-muted: var(--cs-slate-500);
  --color-primary: var(--cs-blue-700);
  --color-primary-dark: var(--cs-blue-900);
  --color-secondary: var(--cs-blue-500);
  --color-accent: #10868A;
  --color-mint: #1F8A6B;
  --shadow-sm: 0 1px 2px rgba(12, 58, 102, 0.06);
  --shadow-md: 0 10px 30px -12px rgba(12, 58, 102, 0.22);
  --shadow-lg: 0 28px 70px -28px rgba(12, 58, 102, 0.3);
  color-scheme: light;
}

.tone-mist {
  --color-background: var(--cs-paper-100);
  --color-background-alt: var(--cs-paper-050);
  --color-surface: var(--cs-paper-000);
  --color-surface-raised: var(--cs-paper-000);
  --color-border: rgba(12, 58, 102, 0.15);
  --color-border-strong: rgba(12, 58, 102, 0.3);
  --color-text-primary: var(--cs-ink-900);
  --color-text-secondary: var(--cs-slate-600);
  --color-text-muted: var(--cs-slate-500);
  --color-primary: var(--cs-blue-700);
  --color-primary-dark: var(--cs-blue-900);
  --color-secondary: var(--cs-blue-500);
  --color-accent: #10868A;
  --color-mint: #1F8A6B;
  --shadow-sm: 0 1px 2px rgba(12, 58, 102, 0.05);
  --shadow-md: 0 10px 30px -14px rgba(12, 58, 102, 0.2);
  --shadow-lg: 0 28px 70px -30px rgba(12, 58, 102, 0.26);
  color-scheme: light;
}

.tone-ink {
  --color-background: var(--cs-ink-900);
  --color-background-alt: var(--cs-ink-850);
  --color-surface: rgba(255, 255, 255, 0.035);
  --color-surface-raised: rgba(255, 255, 255, 0.06);
  --color-border: rgba(150, 200, 235, 0.16);
  --color-border-strong: rgba(150, 200, 235, 0.34);
  --color-text-primary: #EAF2F9;
  --color-text-secondary: #A6BACE;
  --color-text-muted: #8397AD;
  --color-primary: var(--cs-blue-500);
  --color-primary-dark: var(--cs-blue-700);
  --color-secondary: var(--cs-cyan-400);
  --color-accent: var(--cs-cyan-400);
  --color-mint: var(--cs-mint-300);
  --shadow-sm: 0 1px 2px rgba(2, 8, 18, 0.4);
  --shadow-md: 0 14px 40px -16px rgba(2, 8, 18, 0.7);
  --shadow-lg: 0 32px 80px -30px rgba(2, 8, 18, 0.85);
  color-scheme: dark;
}

/* Dark site theme — the same three bands shifted down the ink ramp, so the
   page keeps its light/dark rhythm for visitors who prefer a dark interface. */

html[data-theme="dark"] { color-scheme: dark; }

html[data-theme="dark"] .tone-paper,
html[data-theme="dark"] .tone-mist {
  --color-surface: rgba(255, 255, 255, 0.045);
  --color-surface-raised: rgba(255, 255, 255, 0.07);
  --color-border: rgba(150, 200, 235, 0.16);
  --color-border-strong: rgba(150, 200, 235, 0.32);
  --color-text-primary: #EAF2F9;
  --color-text-secondary: #A6BACE;
  --color-text-muted: #8397AD;
  --color-primary: var(--cs-blue-500);
  --color-primary-dark: var(--cs-blue-700);
  --color-secondary: var(--cs-cyan-400);
  --color-accent: var(--cs-cyan-400);
  --color-mint: var(--cs-mint-300);
  --shadow-sm: 0 1px 2px rgba(2, 8, 18, 0.4);
  --shadow-md: 0 14px 40px -16px rgba(2, 8, 18, 0.66);
  --shadow-lg: 0 32px 80px -30px rgba(2, 8, 18, 0.8);
  color-scheme: dark;
}

html[data-theme="dark"] .tone-paper {
  --color-background: var(--cs-ink-850);
  --color-background-alt: var(--cs-ink-800);
}

html[data-theme="dark"] .tone-mist {
  --color-background: var(--cs-ink-800);
  --color-background-alt: var(--cs-ink-850);
}

html[data-theme="dark"] .tone-ink {
  --color-background: var(--cs-ink-950);
  --color-background-alt: var(--cs-ink-900);
}

/* --------------------------------------------------------------------------
   3. Reset & base
   -------------------------------------------------------------------------- */

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

* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-color: var(--cs-ink-900);
  color: var(--cs-paper-000);
  overflow-x: clip;
  min-height: 100vh;
}

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

img { height: auto; }

ul, ol { list-style: none; }

a {
  color: inherit;
  text-decoration: none;
}

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

button { background: none; border: none; cursor: pointer; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection {
  background: rgba(37, 154, 202, 0.28);
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-secondary, var(--cs-blue-500));
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* --------------------------------------------------------------------------
   4. Layout primitives
   -------------------------------------------------------------------------- */

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

.container--narrow { max-width: var(--container-narrow); }
.container--wide { max-width: var(--container-wide); }

.section { padding-block: var(--section-y); position: relative; }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: clamp(3rem, 5.5vw, 5rem); }

/* A hairline that carries the brand gradient — the recurring "ascent" rule */
.rule-brand {
  height: 2px;
  border: 0;
  background: var(--gradient-brand);
  border-radius: 2px;
}

.divider {
  height: 1px;
  border: 0;
  background: var(--color-border);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 3000;
  padding: 12px 20px;
  border-radius: var(--r-pill);
  background: var(--cs-ink-900);
  color: #fff;
  border: 1px solid var(--cs-blue-500);
  font-size: var(--text-base);
  font-weight: 600;
  transform: translateY(-250%);
  transition: transform var(--dur-2) var(--ease-out);
}

.skip-link:focus-visible { transform: none; }

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

/* --------------------------------------------------------------------------
   5. Typography components
   -------------------------------------------------------------------------- */

/* Technical eyebrow label — part of the ClearStart signature */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  flex: none;
}

.eyebrow--plain::before { display: none; }

.eyebrow__index {
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.display-0 { font-size: var(--display-0); line-height: var(--leading-tight); letter-spacing: var(--tracking-display); }
.display-1 { font-size: var(--display-1); line-height: var(--leading-tight); letter-spacing: var(--tracking-display); }
.display-2 { font-size: var(--display-2); line-height: 1.08; letter-spacing: var(--tracking-display); }
.display-3 { font-size: var(--display-3); line-height: var(--leading-snug); letter-spacing: var(--tracking-tight); }
.display-4 { font-size: var(--display-4); line-height: 1.22; letter-spacing: var(--tracking-tight); }

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 62ch;
}

.body-text {
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  max-width: 68ch;
}

.body-text + .body-text { margin-top: var(--space-4); }

.text-accent { color: var(--color-accent); }

/* Used sparingly — one gradient phrase per page at most */
.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

html[data-theme="dark"] .tone-paper .text-gradient,
html[data-theme="dark"] .tone-mist .text-gradient,
.tone-ink .text-gradient {
  background: linear-gradient(100deg, var(--cs-blue-500) 0%, var(--cs-cyan-400) 50%, var(--cs-mint-300) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* Section heading block */
.sec-head {
  display: grid;
  gap: var(--space-5);
  max-width: 760px;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.sec-head--wide { max-width: none; }

.sec-head__title { font-size: var(--display-2); line-height: 1.08; letter-spacing: var(--tracking-display); }

/* Split heading: label left, content right */
.sec-head--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
  max-width: none;
  align-items: start;
}

/* The right-hand column stacks title, lead and any link with its own rhythm. */
.sec-head--split > div { display: grid; gap: var(--space-5); align-content: start; }

@media (min-width: 900px) {
  .sec-head--split {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 5rem);
  }
  .sec-head--split .eyebrow { padding-top: 0.7em; }
}

/* --------------------------------------------------------------------------
   6. Buttons & links
   -------------------------------------------------------------------------- */

.btn {
  --btn-py: 0.9rem;
  --btn-px: 1.75rem;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--btn-py) var(--btn-px);
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: 0.005em;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  isolation: isolate;
  overflow: hidden;
  transition: color var(--dur-2) var(--ease-out),
              border-color var(--dur-2) var(--ease-out),
              background-color var(--dur-2) var(--ease-out),
              box-shadow var(--dur-2) var(--ease-out);
}

.btn__arrow {
  flex: none;
  transition: transform var(--dur-2) var(--ease-out);
}

.btn:hover .btn__arrow,
.btn:focus-visible .btn__arrow { transform: translateX(5px); }

/* Primary — solid brand blue with a gradient wash that sweeps in on hover */
.btn--primary {
  background-color: var(--cs-blue-700);
  color: #fff;
  box-shadow: 0 1px 2px rgba(6, 30, 55, 0.24);
}

.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  box-shadow: 0 8px 26px -8px rgba(27, 103, 175, 0.6);
}

.btn--primary:hover::before,
.btn--primary:focus-visible::before { opacity: 1; }

.tone-ink .btn--primary,
.mobile-menu .btn--primary,
html[data-theme="dark"] .btn--primary {
  background-color: var(--cs-blue-500);
  color: var(--cs-ink-950);
}

.tone-ink .btn--primary:hover,
.mobile-menu .btn--primary:hover,
html[data-theme="dark"] .btn--primary:hover {
  box-shadow: 0 10px 34px -10px rgba(57, 198, 200, 0.55);
}

/* Secondary — outlined */
.btn--outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}

.btn--outline:hover,
.btn--outline:focus-visible {
  border-color: var(--color-primary);
  background-color: var(--color-surface);
}

.btn--sm { --btn-py: 0.6rem; --btn-px: 1.15rem; font-size: var(--text-sm); }
.btn--lg { --btn-py: 1.1rem; --btn-px: 2.25rem; font-size: var(--text-md); }
.btn--block { display: flex; width: 100%; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

/* Inline arrow link — the standard "read more" treatment site-wide */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-primary);
  /* Sized for a finger, not just for the text. */
  min-height: 34px;
  padding-block: 2px;
  position: relative;
}

.link-arrow::after {
  content: "";
  position: absolute;
  left: 0;
  right: 1.6em;
  bottom: -2px;
  height: 1px;
  background: currentColor;
  opacity: 0.35;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-2) var(--ease-out);
}

.link-arrow:hover::after,
.link-arrow:focus-visible::after { transform: scaleX(1); }

.link-arrow svg { transition: transform var(--dur-2) var(--ease-out); flex: none; }
.link-arrow:hover svg,
.link-arrow:focus-visible svg { transform: translateX(5px); }

.tone-ink .link-arrow { color: var(--cs-cyan-400); }

/* --------------------------------------------------------------------------
   7. Surfaces
   -------------------------------------------------------------------------- */

.panel {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}

.tone-ink .panel { background-color: var(--color-surface); }

/* Chip / tag */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.7rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  color: var(--color-text-secondary);
  transition: border-color var(--dur-2) var(--ease-out), color var(--dur-2) var(--ease-out);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------------
   8. Header / navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding-top: 0;
  transition: padding var(--dur-3) var(--ease-out);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-h);
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  transition: height var(--dur-3) var(--ease-out),
              background-color var(--dur-3) var(--ease-out),
              border-color var(--dur-3) var(--ease-out),
              box-shadow var(--dur-3) var(--ease-out),
              backdrop-filter var(--dur-3) var(--ease-out);
}

/* Scrolled: detaches into a floating, inset pill */
.site-header.is-scrolled { padding-top: 10px; }

.site-header.is-scrolled .site-header__inner {
  height: 60px;
  max-width: calc(var(--container) - 40px);
  padding-inline: clamp(1rem, 2.4vw, 1.5rem);
  background-color: rgba(7, 17, 32, 0.72);
  border-color: rgba(150, 200, 235, 0.16);
  box-shadow: 0 18px 50px -24px rgba(2, 8, 18, 0.8);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  backdrop-filter: blur(18px) saturate(1.4);
}

html[data-theme="light"] .site-header.is-scrolled .site-header__inner,
html:not([data-theme="dark"]) .site-header.is-scrolled .site-header__inner {
  background-color: rgba(255, 255, 255, 0.82);
  border-color: rgba(12, 58, 102, 0.12);
  box-shadow: 0 18px 50px -26px rgba(12, 58, 102, 0.4);
}

/* Header sits over a dark hero until scrolled, so it starts light-on-dark */
.site-header__inner { color: #EAF2F9; }

.site-header.is-scrolled .site-header__inner { color: #EAF2F9; }

html:not([data-theme="dark"]) .site-header.is-scrolled .site-header__inner {
  color: var(--cs-ink-900);
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin-right: auto;
  flex: none;
}

.brand__mark {
  flex: none;
  object-fit: contain;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.brand__name em { font-style: normal; color: var(--cs-cyan-400); }

html:not([data-theme="dark"]) .site-header.is-scrolled .brand__name em { color: #10868A; }

/* Primary nav */
.nav-primary { display: none; }

@media (min-width: 1000px) {
  .nav-primary {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
}

.nav-primary a {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.85rem;
  font-size: var(--text-base);
  font-weight: 500;
  color: currentColor;
  opacity: 0.72;
  transition: opacity var(--dur-2) var(--ease-out);
}

.nav-primary a::after {
  content: "";
  position: absolute;
  left: 0.85rem;
  right: 0.85rem;
  bottom: 0.22rem;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-2) var(--ease-out);
}

.nav-primary a:hover,
.nav-primary a:focus-visible,
.nav-primary a[aria-current="page"] { opacity: 1; }

.nav-primary a:hover::after,
.nav-primary a:focus-visible::after,
.nav-primary a[aria-current="page"]::after { transform: scaleX(1); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: none;
}

.header-actions .btn--primary { display: none; }

@media (min-width: 1000px) {
  .header-actions .btn--primary { display: inline-flex; }
}

/* Icon button (theme toggle, menu) */
.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-pill);
  border: 1px solid currentColor;
  color: inherit;
  opacity: 0.55;
  transition: opacity var(--dur-2) var(--ease-out), background-color var(--dur-2) var(--ease-out);
}

.icon-btn:hover,
.icon-btn:focus-visible { opacity: 1; }

.theme-toggle svg {
  grid-area: 1 / 1;
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-3) var(--ease-out);
}

html:not([data-theme="dark"]) .theme-toggle .icon-sun { opacity: 0; transform: rotate(-80deg) scale(0.4); }
html[data-theme="dark"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(80deg) scale(0.4); }

.menu-btn { display: grid; }

@media (min-width: 1000px) {
  .menu-btn { display: none; }
}

.menu-btn__bars {
  position: relative;
  width: 16px;
  height: 10px;
}

.menu-btn__bars span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-2) var(--ease-out), opacity var(--dur-1) linear;
}

.menu-btn__bars span:nth-child(1) { top: 0; }
.menu-btn__bars span:nth-child(2) { bottom: 0; }

body.menu-open .menu-btn__bars span:nth-child(1) { transform: translateY(4.25px) rotate(45deg); }
body.menu-open .menu-btn__bars span:nth-child(2) { transform: translateY(-4.25px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   9. Mobile menu — full-screen editorial panel
   -------------------------------------------------------------------------- */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 990;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: calc(var(--header-h) + 2rem) var(--gutter) 2rem;
  background-color: var(--cs-ink-900);
  color: #EAF2F9;
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-3) var(--ease-out),
              transform var(--dur-3) var(--ease-out),
              visibility 0s linear var(--dur-3);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}

.mobile-menu__list { display: grid; align-content: start; }

.mobile-menu__list li {
  border-bottom: 1px solid rgba(150, 200, 235, 0.14);
  overflow: hidden;
}

.mobile-menu__list a {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding-block: clamp(0.9rem, 2.6vw, 1.35rem);
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 8vw, 2.75rem);
  font-weight: 600;
  letter-spacing: var(--tracking-display);
  transform: translateY(105%);
  transition: transform var(--dur-3) var(--ease-out);
}

.mobile-menu.is-open .mobile-menu__list a { transform: none; }

.mobile-menu__list li:nth-child(1) a { transition-delay: 60ms; }
.mobile-menu__list li:nth-child(2) a { transition-delay: 110ms; }
.mobile-menu__list li:nth-child(3) a { transition-delay: 160ms; }
.mobile-menu__list li:nth-child(4) a { transition-delay: 210ms; }
.mobile-menu__list li:nth-child(5) a { transition-delay: 260ms; }

.mobile-menu__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  color: var(--cs-cyan-400);
  flex: none;
}

.mobile-menu__foot {
  display: grid;
  gap: var(--space-4);
  padding-top: var(--space-6);
}

.mobile-menu__foot a[href^="mailto"] {
  display: inline-block;
  padding-block: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: #A6BACE;
}

/* --------------------------------------------------------------------------
   10. Page hero (interior pages)
   -------------------------------------------------------------------------- */

.page-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(3.5rem, 9vw, 7rem));
  padding-bottom: clamp(3.5rem, 8vw, 6.5rem);
  overflow: hidden;
}

.page-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
}

.page-hero__inner {
  position: relative;
  display: grid;
  gap: var(--space-6);
  max-width: 900px;
}

.page-hero__title {
  font-size: var(--display-1);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
}

.page-hero__lead { font-size: var(--text-lg); color: var(--color-text-secondary); max-width: 58ch; }

/* Breadcrumb-ish page index */
.page-index {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.page-index a {
  display: inline-block;
  padding-block: 0.45rem;   /* a finger-sized target, not just the text */
}

.page-index a:hover { color: var(--color-accent); }

/* --------------------------------------------------------------------------
   11. Forms
   -------------------------------------------------------------------------- */

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

.field__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.field__label .req { color: var(--color-accent); }

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--text-md);
  transition: border-color var(--dur-2) var(--ease-out), background-color var(--dur-2) var(--ease-out);
}

.field textarea { resize: vertical; min-height: 130px; line-height: 1.6; }

.field input::placeholder,
.field textarea::placeholder { color: var(--color-text-muted); opacity: 0.75; }

.field input:hover,
.field textarea:hover,
.field select:hover { border-color: var(--color-border-strong); }

.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(37, 154, 202, 0.18);
}

.field__error {
  font-size: var(--text-sm);
  color: #C7443A;
  min-height: 1.2em;
}

.tone-ink .field__error { color: #FF8B80; }

.field.has-error input,
.field.has-error textarea { border-color: #C7443A; }

.tone-ink .field.has-error input,
.tone-ink .field.has-error textarea { border-color: #FF8B80; }

/* Choice chips used for "what would you like to improve?" */
.choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr));
  gap: var(--space-3);
}

.choice {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.85rem 1rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-size: var(--text-base);
  cursor: pointer;
  transition: border-color var(--dur-2) var(--ease-out), background-color var(--dur-2) var(--ease-out);
}

.choice input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.choice__box {
  flex: none;
  width: 16px;
  height: 16px;
  border-radius: var(--r-xs);
  border: 1px solid var(--color-border-strong);
  display: grid;
  place-items: center;
  transition: background var(--dur-1) var(--ease-out), border-color var(--dur-1) var(--ease-out);
}

.choice__box svg { opacity: 0; transform: scale(0.6); transition: opacity var(--dur-1), transform var(--dur-1) var(--ease-out); }

.choice:hover { border-color: var(--color-border-strong); }

.choice:has(input:checked) {
  border-color: var(--color-secondary);
  background-color: var(--color-surface-raised);
}

.choice:has(input:checked) .choice__box {
  background: var(--gradient-brand);
  border-color: transparent;
}

.choice:has(input:checked) .choice__box svg { opacity: 1; transform: none; }

.choice:has(input:focus-visible) {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.form-status {
  font-size: var(--text-base);
  padding: var(--space-4);
  border-radius: var(--r-sm);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.form-status:empty { display: none; }

.form-status[data-state="success"] { border-color: var(--color-mint); }
.form-status[data-state="error"] { border-color: #C7443A; }

/* --------------------------------------------------------------------------
   12. Footer
   -------------------------------------------------------------------------- */

.site-footer { padding-top: clamp(3.5rem, 7vw, 6rem); }

.site-footer__top {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

@media (min-width: 860px) {
  .site-footer__top { grid-template-columns: minmax(0, 1fr) minmax(0, 1.9fr); }
}

.site-footer__brand { display: grid; gap: var(--space-5); align-content: start; max-width: 42ch; }

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-6) var(--space-5);
}

/* Grid items default to min-width:auto, so an unbreakable token — the email
   address — forced the footer track wider than the viewport at 320px. */
.footer-col { min-width: 0; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footer-col ul { display: grid; gap: var(--space-1); }

.footer-col a {
  display: inline-block;
  padding-block: 0.45rem;
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  overflow-wrap: anywhere;
  transition: color var(--dur-2) var(--ease-out);
}

.footer-col a:hover,
.footer-col a:focus-visible { color: var(--color-text-primary); }

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.site-footer__bottom a { transition: color var(--dur-2) var(--ease-out); }
.site-footer__bottom a:hover { color: var(--color-text-primary); }

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-5);
}

.site-footer__meta a { display: inline-block; padding-block: 0.45rem; }

.footer-mail { font-family: var(--font-mono); }

/* The email address is a single unbreakable token; let it wrap rather than
   push a container past the viewport edge on narrow screens. */
.footer-mail,
.site-footer__meta a,
.finale__contact dd a,
.contact-aside__list dd a,
.mobile-menu__foot a[href^="mailto"] { overflow-wrap: anywhere; }

/* Social link with an inline icon.
   Matches the specificity of `.footer-col a` so the flex display sticks. */
a.footer-social {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 34px;
  white-space: nowrap;
}

.footer-social svg { flex: none; opacity: 0.75; transition: opacity var(--dur-2) var(--ease-out); }
.footer-social:hover svg { opacity: 1; }

/* --------------------------------------------------------------------------
   13. Scroll reveal
   -------------------------------------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--dur-4) var(--ease-out) var(--reveal-delay, 0ms),
              transform var(--dur-4) var(--ease-out) var(--reveal-delay, 0ms);
}

[data-reveal].is-revealed { opacity: 1; transform: none; }

/* Line-by-line wipe for display headings.
   Uses clip-path rather than an overflow:hidden mask so that a line which
   wraps on a narrow screen still reveals in full — an overflow mask sized to
   one line silently slices the second. The end state insets negatively so
   descenders and overhangs are never clipped either. */
.reveal-lines .line { display: block; }

.reveal-lines .line > span {
  display: block;
  clip-path: inset(0 -0.12em 100% -0.12em);
  transform: translateY(0.3em);
  transition: clip-path var(--dur-4) var(--ease-out) var(--line-delay, 0ms),
              transform var(--dur-4) var(--ease-out) var(--line-delay, 0ms);
}

.reveal-lines.is-revealed .line > span {
  clip-path: inset(-0.3em -0.12em -0.3em -0.12em);
  transform: none;
}

/* --------------------------------------------------------------------------
   14. Reduced motion
   -------------------------------------------------------------------------- */

@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;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .reveal-lines .line > span { clip-path: none; transform: none; }
  .mobile-menu__list a { transform: none; }
}

/* --------------------------------------------------------------------------
   15. Chat widget
   Front end only — see CHAT_ENDPOINT in assets/js/site.js for the single
   integration point. Sits below the mobile menu so the two never overlap.
   -------------------------------------------------------------------------- */

.chat {
  position: fixed;
  right: clamp(1rem, 2.5vw, 1.75rem);
  bottom: clamp(1rem, 2.5vw, 1.75rem);
  z-index: 900;
  display: flex;
  justify-content: flex-end;
}

/* The full-screen menu owns the viewport while it is open. */
body.menu-open .chat { display: none; }

/* ---- launcher ---- */

.chat-launcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  height: 52px;
  padding: 0 1.15rem 0 0.85rem;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  background:
    linear-gradient(var(--cs-ink-900), var(--cs-ink-900)) padding-box,
    var(--gradient-brand) border-box;
  color: #EAF2F9;
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 14px 40px -14px rgba(2, 8, 18, 0.7);
  transition: transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out);
}

.chat-launcher:hover,
.chat-launcher:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 46px -14px rgba(27, 103, 175, 0.65);
}

.chat-launcher__icon {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: none;
}

.chat-launcher__icon svg {
  grid-area: 1 / 1;
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}

.chat-launcher .icon-close { opacity: 0; transform: rotate(-90deg) scale(0.6); }

.chat.is-open .chat-launcher .icon-chat { opacity: 0; transform: rotate(90deg) scale(0.6); }
.chat.is-open .chat-launcher .icon-close { opacity: 1; transform: none; }

/* One slow ring, so the button reads as live without blinking for attention. */
.chat-launcher::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: inherit;
  border: 1px solid var(--cs-cyan-400);
  opacity: 0;
  animation: chat-ring 4.5s var(--ease-out) infinite;
  pointer-events: none;
}

.chat.is-open .chat-launcher::after { animation: none; }

@keyframes chat-ring {
  0%   { opacity: 0.5; transform: scale(0.96); }
  55%  { opacity: 0; transform: scale(1.06); }
  100% { opacity: 0; transform: scale(1.06); }
}

@media (max-width: 560px) {
  .chat-launcher {
    width: 50px;
    height: 50px;
    padding: 0;
    justify-content: center;
  }
  .chat-launcher__label { display: none; }
  .chat.is-open .chat-launcher { display: none; }
}

/* ---- panel ---- */

.chat-panel {
  position: absolute;
  right: 0;
  bottom: calc(100% + 0.75rem);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  width: min(384px, calc(100vw - 2rem));
  height: min(560px, calc(100vh - 9rem));
  border-radius: var(--r-lg);
  border: 1px solid rgba(150, 200, 235, 0.18);
  background-color: var(--cs-ink-900);
  color: #EAF2F9;
  box-shadow: 0 32px 80px -24px rgba(2, 8, 18, 0.8);
  overflow: hidden;
  transform-origin: bottom right;
  opacity: 0;
  transform: translateY(10px) scale(0.97);
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out);
}

.chat-panel[hidden] { display: none; }

.chat.is-open .chat-panel { opacity: 1; transform: none; }

@media (max-width: 560px) {
  .chat-panel {
    position: fixed;
    right: 0;
    left: 0;
    bottom: 0;
    width: 100%;
    height: min(86vh, 620px);
    border-radius: var(--r-lg) var(--r-lg) 0 0;
    border-bottom: 0;
    transform-origin: bottom center;
  }
}

.chat-panel__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid rgba(150, 200, 235, 0.14);
  background-color: rgba(255, 255, 255, 0.03);
}

.chat-avatar {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(150, 200, 235, 0.22);
  background-color: rgba(255, 255, 255, 0.05);
}

.chat-panel__title {
  font-size: var(--text-md);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.chat-panel__status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-cyan-400);
}

.chat-close {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid rgba(150, 200, 235, 0.28);
  color: #A6BACE;
  transition: color var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out);
}

.chat-close:hover,
.chat-close:focus-visible { color: #EAF2F9; border-color: rgba(150, 200, 235, 0.5); }

/* ---- log ---- */

.chat-log {
  display: grid;
  align-content: start;
  gap: 0.6rem;
  padding: 1rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.chat-msg {
  max-width: 88%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--r-md);
  font-size: var(--text-base);
  line-height: 1.55;
}

.chat-msg--bot {
  justify-self: start;
  border: 1px solid rgba(150, 200, 235, 0.16);
  background-color: rgba(255, 255, 255, 0.05);
  border-bottom-left-radius: var(--r-xs);
}

.chat-msg--user {
  justify-self: end;
  background-color: var(--cs-blue-700);
  color: #fff;
  border-bottom-right-radius: var(--r-xs);
}

.chat-msg a { color: var(--cs-cyan-400); text-decoration: underline; text-underline-offset: 2px; }
.chat-msg--user a { color: #fff; }
.chat-msg p + p { margin-top: 0.5rem; }

.chat-typing { display: inline-flex; gap: 4px; align-items: center; padding: 0.2rem 0; }

.chat-typing span {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--cs-cyan-400);
  animation: chat-dot 1.3s var(--ease-in-out) infinite;
}

.chat-typing span:nth-child(2) { animation-delay: 0.16s; }
.chat-typing span:nth-child(3) { animation-delay: 0.32s; }

@keyframes chat-dot {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

/* ---- suggestions ---- */

.chat-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0 1rem 0.75rem;
}

.chat-suggestions:empty { display: none; }

.chat-chip {
  padding: 0.4rem 0.7rem;
  border-radius: var(--r-pill);
  border: 1px solid rgba(150, 200, 235, 0.28);
  background-color: transparent;
  color: #A6BACE;
  font-size: var(--text-sm);
  text-align: left;
  transition: color var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out),
              background-color var(--dur-2) var(--ease-out);
}

.chat-chip:hover,
.chat-chip:focus-visible {
  color: #EAF2F9;
  border-color: var(--cs-cyan-400);
  background-color: rgba(57, 198, 200, 0.08);
}

/* ---- input ---- */

.chat-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid rgba(150, 200, 235, 0.14);
}

.chat-form input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-pill);
  border: 1px solid rgba(150, 200, 235, 0.22);
  background-color: rgba(255, 255, 255, 0.04);
  color: #EAF2F9;
  font-size: var(--text-base);
  transition: border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out);
}

.chat-form input::placeholder { color: #7A90A8; }

.chat-form input:focus {
  outline: none;
  border-color: var(--cs-blue-500);
  box-shadow: 0 0 0 3px rgba(37, 154, 202, 0.2);
}

.chat-send {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: var(--cs-ink-950);
  transition: transform var(--dur-2) var(--ease-out), opacity var(--dur-2) var(--ease-out);
}

.chat-send:hover { transform: scale(1.05); }
.chat-send:disabled { opacity: 0.4; transform: none; cursor: default; }

.chat-foot {
  padding: 0 1rem 0.9rem;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: #7A90A8;
}

.chat-foot a { color: #A6BACE; text-decoration: underline; text-underline-offset: 2px; }
.chat-foot a:hover { color: #EAF2F9; }

/* Clearance for the launcher, which would otherwise sit permanently on top of
   the last footer row on small screens. Scoped with :has() so the padding
   disappears while the widget is commented out, and returns with it. */
@media (max-width: 560px) {
  body:has(.chat) .site-footer__bottom { padding-bottom: 4.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  .chat-launcher::after { animation: none !important; opacity: 0 !important; }
  .chat-typing span { animation: none !important; opacity: 0.8 !important; }
  .chat-panel { transform: none !important; }
}

/* --------------------------------------------------------------------------
   16. Scroll progress
   A single hairline at the top edge. Hidden at rest so it never competes with
   the hero, and only earns its place once the page is long enough to scroll.
   -------------------------------------------------------------------------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1100;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease-out);
}

.scroll-progress.is-visible { opacity: 1; }

.scroll-progress span {
  display: block;
  height: 100%;
  background: var(--gradient-brand);
  transform: scaleX(var(--progress, 0));
  transform-origin: left;
}

/* --------------------------------------------------------------------------
   17. Cross-document view transitions
   Progressive enhancement — browsers without support navigate exactly as
   before. The header is named so it holds still while the content crossfades,
   which is what makes six separate pages feel like one product.
   -------------------------------------------------------------------------- */

@view-transition { navigation: auto; }

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 260ms;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

.site-header { view-transition-name: site-header; }

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) { animation: none !important; }
}

/* --------------------------------------------------------------------------
   18. Hero network — focused node state
   Hovering a node lights its own connection into the core and dims the rest,
   so the visual reads as a system with routes rather than as decoration.
   Pointer-only: the diagram already carries a text alternative, and the same
   relationships are stated in the Intelligence Layer section.
   -------------------------------------------------------------------------- */

.network__node { cursor: default; }

.network__edge.is-active {
  opacity: 1;
  stroke-width: 2.2;
}

.network.has-active .network__edge:not(.is-active) { opacity: 0.22; }

.network.has-active .network__node:not(.is-active) .network__label { fill: #64788D; }
.network.has-active .network__node:not(.is-active) .network__node-ring { stroke: rgba(150, 200, 235, 0.2); }

.network__node.is-active .network__node-ring { stroke: var(--cs-cyan-400); }
.network__node.is-active .network__label { fill: #EAF2F9; }

.network__node.is-active .network__node-dot {
  fill: var(--cs-cyan-400);
  filter: drop-shadow(0 0 6px rgba(57, 198, 200, 0.9));
}

.network__edge,
.network__label,
.network__node-ring { transition: opacity var(--dur-2) var(--ease-out), stroke var(--dur-2) var(--ease-out), stroke-width var(--dur-2) var(--ease-out), fill var(--dur-2) var(--ease-out); }