/* ============================================================
   RAI Swarms v2 — site.css
   Single production stylesheet. Merged from tokens + base + components.
   Load order preserves the cascade: design tokens → base → components.
   No @import chains. No local-only paths. Case-sensitive on Linux.
   ============================================================ */


/* ============================================================
   1. DESIGN TOKENS
   Aligned with verakovaleva.com design system.
   ============================================================ */

:root {
  /* ---------- Background ---------- */
  --bg:              #06070a;        /* near-black, cold undertone */
  --bg-void:         #06070a;        /* alias for back-compat */
  --bg-base:         #06070a;
  --bg-raised:       rgba(255, 255, 255, 0.018);
  --bg-elevated:     rgba(255, 255, 255, 0.032);
  --surface:         rgba(255, 255, 255, 0.025);
  --bg-inverse:      #f5f5f3;

  /* ---------- Ink scale (text) ---------- */
  --ink:             #ffffff;        /* headings, top menu, primary */
  --ink-2:           #dee1e6;        /* body, lede, paragraphs (soft off-white) */
  --ink-3:           #dee1e6;        /* secondary body — same tone */
  --ink-4:           #8c909a;        /* caps labels, eyebrow, indices, footer meta */
  --ink-5:           #4a4e57;        /* ghost / disabled */

  /* Aliases for back-compat with existing class usage */
  --text-primary:    var(--ink);
  --text-secondary:  var(--ink-2);
  --text-tertiary:   var(--ink-4);
  --text-muted:      var(--ink-5);

  /* ---------- Lines ---------- */
  --line:            rgba(255, 255, 255, 0.08);   /* thin section dividers */
  --line-2:          rgba(255, 255, 255, 0.16);   /* mid accents */
  --line-hot:        rgba(220, 232, 250, 0.42);   /* highlighted */

  /* Aliases */
  --line-faint:      var(--line);
  --line-soft:       var(--line);
  --line-strong:     var(--line-2);

  /* ---------- RAI gradient (saturated, 5 stops, 135°) ---------- */
  --rai-0:           #f5b487;        /* warm peach */
  --rai-26:          #f297c8;        /* pink */
  --rai-52:          #c592eb;        /* lavender */
  --rai-78:          #8aaee8;        /* periwinkle */
  --rai-100:         #7cc4d6;        /* teal */

  --grad-rai:        linear-gradient(135deg,
                       var(--rai-0)   0%,
                       var(--rai-26)  26%,
                       var(--rai-52)  52%,
                       var(--rai-78)  78%,
                       var(--rai-100) 100%);

  /* Text-clip variant (90°) for inline word treatments */
  --grad-rai-text:   linear-gradient(90deg,
                       var(--rai-0)   0%,
                       var(--rai-26)  26%,
                       var(--rai-52)  52%,
                       var(--rai-78)  78%,
                       var(--rai-100) 100%);

  /* RAI Swarms Hero gradient — 4 stops at 115°, cool→warm.
     Used on hero headline accent words («Autonomous Robots»). */
  --grad-rai-hero:   linear-gradient(115deg,
                       #7fd9e6 0%,
                       #b89ee6 35%,
                       #e8a8c3 65%,
                       #f0c08a 100%);

  /* Pastel version — primary button hover */
  --grad-rai-pastel: linear-gradient(135deg,
                       #fad6b9 0%,
                       #f8c2db 26%,
                       #dabcef 52%,
                       #b4c8ee 78%,
                       #b5dbe3 100%);

  /* Transparent version (alpha 0.13) — outline button hover */
  --grad-rai-soft:   linear-gradient(135deg,
                       rgba(245, 180, 135, 0.13) 0%,
                       rgba(242, 151, 200, 0.13) 26%,
                       rgba(197, 146, 235, 0.13) 52%,
                       rgba(138, 174, 232, 0.13) 78%,
                       rgba(124, 196, 214, 0.13) 100%);

  /* Aliases for legacy gradient usage */
  --grad-prism:      var(--grad-rai);
  --grad-cool:       linear-gradient(180deg, var(--rai-100) 0%, var(--rai-52) 100%);
  --grad-warm:       linear-gradient(180deg, var(--rai-26) 0%, var(--rai-0) 100%);
  --grad-veil:       linear-gradient(180deg,
                       rgba(124, 196, 214, 0.05) 0%,
                       rgba(197, 146, 235, 0.04) 50%,
                       rgba(242, 151, 200, 0.03) 100%);

  /* ---------- Glow tokens (lavender base) ---------- */
  --glow-base:       rgba(197, 146, 235, 0.35);
  --glow-card-hover:    0 16px 40px -14px rgba(197, 146, 235, 0.35);
  --glow-sibling-hover: 0 14px 36px -12px rgba(197, 146, 235, 0.40);
  --glow-primary-hover: 0 10px 28px -12px rgba(197, 146, 235, 0.32);

  /* ---------- Typography ---------- */
  --font-display:    'Geometria', 'Futura PT', 'Futura', 'Avenir Next', 'Avenir', 'Inter', system-ui, sans-serif;
  --font-body:       'Geometria', 'Futura PT', 'Futura', 'Avenir Next', 'Avenir', 'Inter', system-ui, sans-serif;
  --font-mono:       'SF Mono', 'Menlo', 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  --weight-light:    300;
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-bold:     800;

  /* Type scale — per spec */
  --fs-base:         18px;
  --fs-body:         18px;
  --fs-body-sm:      16px;
  --fs-body-lg:      19px;

  /* Type scale — BIG, dramatic.
     The verakovaleva spec provides minimums; we go bigger for RAI Swarms hero feel. */
  --fs-hero-name:    clamp(56px, 9.5vw, 140px);            /* hero h1 */
  --fs-hero-lede:    clamp(20px, 2.1vw, 30px);             /* hero tagline */
  --fs-page-h1:      clamp(52px, 8.5vw, 124px);            /* page-hero h1 */
  --fs-page-lede:    clamp(18px, 1.4vw, 22px);
  --fs-page-tagline: clamp(20px, 2.2vw, 28px);
  --fs-h2:           clamp(38px, 6vw, 80px);               /* section title */
  --fs-h3:           clamp(26px, 2.6vw, 38px);             /* card title */
  --fs-h4:           clamp(22px, 1.8vw, 28px);             /* feature h4 */
  --fs-h4-sm:        clamp(20px, 1.5vw, 24px);             /* focus h4 */
  --fs-closing:      clamp(54px, 9vw, 128px);
  --fs-sibling:      20px;
  --fs-sibling-desc: 14px;
  --fs-form-input:   15px;
  --fs-form-label:   10.5px;
  --fs-btn:          13px;
  --fs-nav:          13px;
  --fs-nav-sig:      16px;
  --fs-nav-role:     11px;
  --fs-eyebrow:      11px;
  --fs-footer:       12px;
  --fs-footer-link:  11px;

  --leading-tight:   1.05;
  --leading-snug:    1.2;
  --leading-normal:  1.45;
  --leading-relaxed: 1.6;

  --tracking-tight:    -0.02em;
  --tracking-snug:     -0.01em;
  --tracking-base:     0;
  --tracking-wide:     0.04em;
  --tracking-eyebrow:  0.18em;
  --tracking-caps:     0.12em;

  /* ---------- Spacing ---------- */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;
  --space-10: 128px;
  --space-11: 192px;

  /* ---------- Layout ---------- */
  --container-max:    1240px;
  --container-narrow: 880px;
  --container-wide:   1440px;
  --gutter:           clamp(20px, 4vw, 56px);
  --pad-y:            clamp(96px, 12vw, 168px);
  --pad-y-mobile:     clamp(72px, 16vw, 110px);

  /* ---------- Radii ---------- */
  --r-sm: 4px;   /* buttons, inputs, checkbox */
  --r-md: 10px;  /* cards, form container, sibling-nav */
  --r-lg: 18px;  /* reserved */

  /* Aliases */
  --r-1: var(--r-sm);
  --r-2: var(--r-sm);
  --r-3: var(--r-md);
  --r-4: var(--r-lg);
  --r-pill: 999px;

  /* ---------- Motion ---------- */
  --t-fast:   180ms;    /* hover colors, micro-transitions */
  --t-med:    420ms;    /* card appear / transform */
  --t-slow:   900ms;    /* reveal, sweep */

  --ease-std:   cubic-bezier(.2,.6,.2,1);
  --ease-rev:   cubic-bezier(.16,.84,.32,1);

  /* Aliases */
  --dur-fast:      var(--t-fast);
  --dur-base:      var(--t-med);
  --dur-slow:      var(--t-med);
  --dur-cinematic: var(--t-slow);
  --ease-out:      var(--ease-std);
  --ease-in-out:   var(--ease-std);
  --ease-emph:     var(--ease-rev);

  /* ---------- Shadows ---------- */
  --shadow-1:      0 1px 0 rgba(255,255,255,0.04) inset, 0 1px 3px rgba(0,0,0,0.4);
  --shadow-2:      0 1px 0 rgba(255,255,255,0.04) inset, 0 10px 30px rgba(0,0,0,0.5);
  --shadow-portrait: 0 30px 80px -30px rgba(0,0,0,0.7);
  --shadow-glow:   0 0 0 1px rgba(184, 158, 230, 0.18), 0 20px 60px rgba(127, 217, 230, 0.06);

  /* ---------- Z ---------- */
  --z-bg-field: 0;
  --z-nav:      100;
  --z-modal:    1000;
}


/* ============================================================
   2. BASE
   Font faces, resets, typography primitives, background field.
   Font paths are relative to this file at assets/css/site.css,
   so ../fonts/<File>.ttf resolves to assets/fonts/<File>.ttf.
   ============================================================ */

@font-face {
  font-family: 'Geometria';
  src: url('../fonts/Geometria-Light.ttf') format('truetype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Geometria';
  src: url('../fonts/Geometria-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Geometria';
  src: url('../fonts/Geometria-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Geometria';
  src: url('../fonts/Geometria-ExtraBold.ttf') format('truetype');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  width: 100%;
  overflow-x: clip;
}

@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;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  padding: 0;
  width: 100%;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
  letter-spacing: 0;
  overflow-x: clip;
  position: relative;
}

::selection {
  background: rgba(197, 146, 235, 0.35);
  color: #fff;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease-std);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: var(--space-7) 0;
}

/* ============================================================
   Signal field — fixed background system (radial glows + grid +
   drifting orbs + noise grain + CRT scanlines)
   ============================================================ */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: var(--z-bg-field);
  pointer-events: none;
  overflow: hidden;
}

/* A — cool blue, top-left */
.bg-field::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60vmax 50vmax at 12% 8%,
      rgba(60, 90, 160, 0.18) 0%, transparent 60%),
    radial-gradient(55vmax 45vmax at 88% 10%,
      rgba(180, 120, 80, 0.07) 0%, transparent 60%),
    radial-gradient(65vmax 50vmax at 50% 100%,
      rgba(60, 90, 160, 0.16) 0%, transparent 60%);
}

/* Grid 88×88 with elliptical mask */
.bg-field::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 35%, transparent 80%);
          mask-image: radial-gradient(ellipse at center, #000 35%, transparent 80%);
}

/* Drifting orbs */
.bg-field__orb {
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.55;
  will-change: transform;
}
.bg-field__orb--a {
  top: -20vmax;
  left: -10vmax;
  background: radial-gradient(circle, rgba(197, 146, 235, 0.32) 0%, transparent 65%);
  animation: bg-drift-a 28s var(--ease-std) infinite alternate;
}
.bg-field__orb--b {
  bottom: -25vmax;
  right: -15vmax;
  background: radial-gradient(circle, rgba(124, 196, 214, 0.28) 0%, transparent 65%);
  animation: bg-drift-b 36s var(--ease-std) infinite alternate;
}
@keyframes bg-drift-a {
  0%   { transform: translate3d(0, 0, 0)        rotate(0deg); }
  100% { transform: translate3d(8vmax, 6vmax, 0) rotate(40deg); }
}
@keyframes bg-drift-b {
  0%   { transform: translate3d(0, 0, 0)         rotate(0deg); }
  100% { transform: translate3d(-7vmax, -5vmax, 0) rotate(-30deg); }
}

/* Noise grain overlay (inline SVG fractalNoise) */
.bg-field__noise {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.6 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-size: 240px 240px;
}

/* CRT scanlines */
.bg-field__scan {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.04) 0px,
    rgba(255, 255, 255, 0.04) 1px,
    transparent 1px,
    transparent 2px
  );
  mix-blend-mode: overlay;
  opacity: 0.35;
}

@media (prefers-reduced-motion: reduce) {
  .bg-field__orb--a,
  .bg-field__orb--b { animation: none; }
}

/* Ensure content sits above the field */
.site-nav,
main,
.site-footer { position: relative; z-index: 1; }

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6,
.t-display, .t-h1, .t-h2, .t-h3, .t-h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  color: var(--ink);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin: 0;
}

.t-display { font-size: var(--fs-hero-name); }
h1, .t-h1  { font-size: var(--fs-hero-name); line-height: 0.98; }
h2, .t-h2  { font-size: var(--fs-h2);        line-height: var(--leading-snug); }
h3, .t-h3  { font-size: var(--fs-h3);        line-height: var(--leading-snug); letter-spacing: var(--tracking-snug); }
h4, .t-h4  { font-size: var(--fs-h4);        line-height: var(--leading-snug); letter-spacing: var(--tracking-snug); }

p, .t-body {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
  color: var(--ink-2);
  margin: 0;
}

.t-lead {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--ink-2);
  letter-spacing: var(--tracking-snug);
}

.t-eyebrow {
  font-family: var(--font-mono);
  font-weight: var(--weight-regular);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ink-4);
  display: inline-block;
}

.t-eyebrow--accent {
  background: var(--grad-rai-text);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.t-mono {
  font-family: var(--font-mono);
  font-size: var(--fs-nav-role);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-4);
}

.t-muted   { color: var(--ink-4); }
.t-primary { color: var(--ink); }

.t-gradient {
  background: var(--grad-rai-text);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

strong, b {
  font-weight: var(--weight-bold);
  color: var(--ink);
}

em, i {
  font-style: normal;
  color: var(--ink);
}

ul, ol { margin: 0; padding: 0; list-style: none; }

/* Containers */
.container         { width: 100%; max-width: var(--container-max);    margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow { width: 100%; max-width: var(--container-narrow); margin-inline: auto; padding-inline: var(--gutter); }
.container--wide   { width: 100%; max-width: var(--container-wide);   margin-inline: auto; padding-inline: var(--gutter); }

/* Section spacing — per spec */
.section          { padding-block: var(--pad-y); position: relative; }
.section + .section { border-top: 1px solid var(--line); }
.section--tight   { padding-block: clamp(56px, 7vw, 96px); }
.section--hero    { padding-block: clamp(112px, 16vw, 220px) clamp(72px, 9vw, 128px); }

@media (max-width: 720px) {
  .section { padding-block: var(--pad-y-mobile); }
}

/* Visually hidden */
.sr-only {
  position: absolute !important; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--rai-78);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}


/* ============================================================
   3. COMPONENTS
   Site chrome, buttons, cards, forms, hero, footer, etc.
   ============================================================ */

/* ============================================================
   NAV
   ============================================================ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  background: rgba(6, 7, 10, 0.55);
  border-bottom: 1px solid var(--line);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: 14px;
}
.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--ink);
  line-height: 1.1;
  position: relative;
}
.site-nav__brand img {
  height: 60px;
  width: auto;
  filter: drop-shadow(0 0 22px rgba(180, 160, 220, 0.20));
}
.site-nav__brand-mark {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 1px solid var(--line-2);
  line-height: 1.15;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-nav-sig);
  color: var(--ink);
  letter-spacing: 0;
  min-height: 28px;
  justify-content: center;
}
.site-nav__brand-sub {
  font-family: var(--font-mono);
  font-weight: var(--weight-regular);
  font-size: var(--fs-nav-role);
  letter-spacing: var(--tracking-caps);
  color: var(--ink);
  text-transform: uppercase;
  margin: 0;
}
.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.site-nav__link {
  font-family: var(--font-display);
  font-weight: var(--weight-light);
  font-size: var(--fs-nav);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--ink);
  position: relative;
  padding: 6px 0;
  transition: color var(--t-fast) var(--ease-std);
}
.site-nav__link:hover { color: var(--rai-78); }
.site-nav__link[aria-current="page"] { color: var(--ink); }
.site-nav__link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--grad-rai-text);
}
.site-nav__cta {
  display: inline-flex;
  align-items: center;
}
.site-nav__toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-sm);
  align-items: center;
  justify-content: center;
}
.site-nav__toggle span,
.site-nav__toggle span::before,
.site-nav__toggle span::after {
  content: '';
  display: block;
  width: 16px; height: 1.5px;
  background: var(--ink);
  transition: transform var(--t-med) var(--ease-std);
}
.site-nav__toggle span::before { transform: translateY(-5px); position: absolute; }
.site-nav__toggle span::after  { transform: translateY( 5px); position: absolute; }
.site-nav__toggle span { position: relative; }

/* Spacer so fixed nav doesn't cover content. Nav grew to fit 2-line brand. */
main { padding-top: 108px; }

@media (max-width: 720px) {
  .site-nav__brand-mark { display: none; }
  .site-nav__brand img { height: 56px; }
  .site-nav__links,
  .site-nav__cta { display: none; }
  .site-nav__toggle { display: inline-flex; }
  .site-nav.is-open .site-nav__links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: var(--space-5) var(--gutter) var(--space-6);
  }
  .site-nav.is-open .site-nav__link {
    font-weight: var(--weight-light);
  }
  .site-nav.is-open .site-nav__cta {
    display: inline-flex;
    margin-top: var(--space-3);
  }
}

/* ============================================================
   BUTTONS
   Rule: at most ONE gradient button (.btn--primary) per page.
   Default .btn / .btn--ghost = neutral (transparent, light border).
   ============================================================ */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-btn);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  padding: 14px 22px;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-2);
  transition: background var(--t-med) var(--ease-std),
              border-color var(--t-med) var(--ease-std),
              color      var(--t-med) var(--ease-std),
              box-shadow var(--t-med) var(--ease-std),
              transform  var(--t-med) var(--ease-std);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  isolation: isolate;
}

/* Diagonal sweep on hover */
.btn::before {
  content: '';
  position: absolute;
  top: -50%; bottom: -50%; left: -60%;
  width: 40%;
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(255, 255, 255, 0.06) 45%,
    rgba(255, 255, 255, 0.20) 50%,
    rgba(255, 255, 255, 0.06) 55%,
    transparent 100%
  );
  transform: skewX(-18deg);
  transition: left var(--t-slow) var(--ease-std);
  pointer-events: none;
  z-index: 1;
}
.btn:hover::before { left: 130%; }

.btn > * { position: relative; z-index: 2; }

.btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.32);
  color: var(--ink);
}

/* PRIMARY — the ONE gradient button per page */
.btn--primary {
  background: var(--grad-rai-hero);
  color: #0a0b0e;
  border-color: transparent;
  box-shadow: 0 8px 24px -14px rgba(197, 146, 235, 0.55);
}
.btn--primary::before {
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(255, 255, 255, 0.18) 45%,
    rgba(255, 255, 255, 0.45) 50%,
    rgba(255, 255, 255, 0.18) 55%,
    transparent 100%
  );
}
.btn--primary:hover {
  background: var(--grad-rai-hero);
  color: #0a0b0e;
  border-color: transparent;
  filter: brightness(1.08) saturate(1.1);
  box-shadow: 0 14px 34px -14px rgba(197, 146, 235, 0.55);
  transform: translateY(-1px);
}

/* GHOST — neutral, alias for .btn default look */
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-2);
}

/* Legacy prism — neutral (no more bright gradient) */
.btn--prism {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-2);
}
.btn--prism:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.32);
}

/* Reverse — neutral by default, gradient on hover */
.btn--grad-on-hover {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-2);
}
.btn--grad-on-hover:hover {
  background: var(--grad-rai-hero);
  color: #0a0b0e;
  border-color: transparent;
  box-shadow: 0 12px 30px -14px rgba(197, 146, 235, 0.55);
  transform: translateY(-1px);
}
.btn--grad-on-hover:hover::before {
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(255, 255, 255, 0.18) 45%,
    rgba(255, 255, 255, 0.45) 50%,
    rgba(255, 255, 255, 0.18) 55%,
    transparent 100%
  );
}

.btn--lg { padding: 16px 28px; font-size: 14px; }

.btn .arrow {
  width: 14px; height: 14px;
  transition: transform var(--t-med) var(--ease-std);
}
.btn:hover .arrow { transform: translateX(4px); }

/* ============================================================
   LINKS
   ============================================================ */
.link {
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: border-color var(--t-med) var(--ease-std);
}
.link:hover { border-color: var(--rai-78); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-btn);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--ink);
}
.link-arrow::after {
  content: '→';
  transition: transform var(--t-med) var(--ease-std);
}
.link-arrow:hover::after { transform: translateX(4px); }

/* ============================================================
   FRAMES — gradient 1.5px 135° (cards, form, sibling-nav, inputs)
   Pattern: 1.5px transparent border + double background-clip layer.
   ============================================================ */
.frame-grad {
  position: relative;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    var(--grad-rai) border-box;
}

/* ============================================================
   CARDS — neutral dark by default, gradient border outline,
   gradient bg appears only on hover (max 1 active per page).
   ============================================================ */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  /* Padding-box: solid elevated dark.  Border-box: gradient outline. */
  background:
    linear-gradient(#11131a, #11131a) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  transition: transform var(--t-med) var(--ease-std),
              box-shadow var(--t-med) var(--ease-std),
              background var(--t-med) var(--ease-std);
  overflow: hidden;
  isolation: isolate;
}
/* Hover overlay — soft gradient veil fades in on top of the card */
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-rai-hero);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-std);
  z-index: -1;
  border-radius: inherit;
  mix-blend-mode: normal;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-card-hover);
}
.card:hover::before { opacity: 0.85; }
/* Adjust text contrast on hover (gradient bg is light, text must stay readable) */
.card:hover .card__title,
.card:hover .card__desc { color: #0a0b0e; }
.card:hover .card__index,
.card:hover .card__meta { color: rgba(10, 11, 14, 0.6); }
.card:hover .card__meta { border-top-color: rgba(10, 11, 14, 0.15); }

.card__index {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.card__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-h3);
  letter-spacing: var(--tracking-snug);
  color: var(--ink);
  line-height: var(--leading-snug);
}
.card__desc {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  color: var(--ink-2);
  font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
}
.card__meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}

/* Industry card variant */
.card--industry { min-height: 280px; }
.card--industry .card__title { font-size: var(--fs-h3); }
.card--industry .card__arrow {
  position: absolute;
  top: var(--space-5); right: var(--space-5);
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-4);
  background: rgba(6, 7, 10, 0.4);
  transition: all var(--t-med) var(--ease-std);
}
.card--industry:hover .card__arrow {
  color: var(--ink);
  border-color: var(--line-hot);
  transform: rotate(-45deg);
}

/* Capability card */
.card--capability {
  padding: var(--space-5);
  min-height: 220px;
}
.card--capability .card__title { font-size: var(--fs-h4); }

/* ============================================================
   SIBLING-NAV (bottom of child pages)
   ============================================================ */
.sibling-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-9);
}
@media (max-width: 720px) {
  .sibling-nav { grid-template-columns: 1fr; }
}
.sibling-nav__item {
  position: relative;
  display: block;
  padding: var(--space-6);
  background:
    linear-gradient(#11131a, #11131a) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  transition: transform var(--t-med) var(--ease-std),
              box-shadow var(--t-med) var(--ease-std);
  overflow: hidden;
  isolation: isolate;
}
.sibling-nav__item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-rai-hero);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-std);
  z-index: -1;
  border-radius: inherit;
}
.sibling-nav__item:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-sibling-hover);
}
.sibling-nav__item:hover::before { opacity: 0.85; }
.sibling-nav__item:hover .sibling-nav__title { color: #0a0b0e; }
.sibling-nav__item:hover .sibling-nav__desc  { color: rgba(10, 11, 14, 0.7); }
.sibling-nav__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-sibling);
  color: var(--ink);
  letter-spacing: var(--tracking-snug);
}
.sibling-nav__desc {
  margin-top: var(--space-3);
  font-family: var(--font-body);
  font-weight: var(--weight-light);
  font-size: var(--fs-sibling-desc);
  color: var(--ink-2);
  line-height: var(--leading-relaxed);
}

/* ============================================================
   GRIDS
   ============================================================ */
.grid          { display: grid; gap: var(--space-5); }
.grid--2       { grid-template-columns: repeat(2, 1fr); }
.grid--3       { grid-template-columns: repeat(3, 1fr); }
.grid--4       { grid-template-columns: repeat(4, 1fr); }
.grid--cap     { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--industry{ grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
@media (max-width: 960px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ============================================================
   NUMBERED LIST / FEATURE-LIST
   ============================================================ */
.numbered-list {
  display: grid;
  gap: 0;
  background: var(--line);
  border-block: 1px solid var(--line);
}
.numbered-list__item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-5);
  padding: var(--space-6) 0;
  background: var(--bg);
  align-items: baseline;
  border-top: 1px solid var(--line);
}
.numbered-list__item:first-child { border-top: 0; }
.numbered-list__num {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.numbered-list__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-h4);
  line-height: var(--leading-snug);
  color: var(--ink);
  letter-spacing: var(--tracking-snug);
}
.numbered-list__desc {
  margin-top: var(--space-3);
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-body-lg);
  color: var(--ink-2);
  max-width: 60ch;
  line-height: var(--leading-relaxed);
}
@media (max-width: 700px) {
  .numbered-list__item { grid-template-columns: 1fr; gap: var(--space-3); }
}

/* ============================================================
   HERO PARTS
   ============================================================ */
.hero {
  position: relative;
  padding-block: clamp(112px, 16vw, 220px) clamp(72px, 9vw, 128px);
}
.hero__eyebrow { margin-bottom: var(--space-5); }
.hero__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(56px, 9.5vw, 140px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  color: var(--ink);
  max-width: 18ch;
}
/* «Brain for Autonomous Robots» — hero gradient (4-stop, 115°) */
.hero__title em {
  color: transparent;
  background: var(--grad-rai-hero);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__lead {
  margin-top: var(--space-6);
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-hero-lede);
  color: var(--ink-2);
  max-width: 60ch;
  line-height: var(--leading-relaxed);
}
.hero__cta {
  margin-top: var(--space-7);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Hero ambient glow (kept for backward-compat with markup) */
.hero__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(700px 420px at 75% 30%, rgba(124, 196, 214, 0.12) 0%, transparent 65%),
    radial-gradient(600px 380px at 20% 70%, rgba(197, 146, 235, 0.10) 0%, transparent 65%);
  opacity: .9;
}

.hero__grid {
  position: absolute; inset: 0; pointer-events: none; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}

/* Hero-divider line under hero */
.hero-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-2), transparent);
}

/* ============================================================
   SECTION HEADER
   ============================================================ */
.section-head {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  max-width: 70ch;
}
.section-head__index {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-4);
}
.section-head__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-h2);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
  color: var(--ink);
}
.section-head__lead {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-body-lg);
  color: var(--ink-2);
  line-height: var(--leading-relaxed);
}

/* ============================================================
   KEYFACT / STATS
   ============================================================ */
.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-6);
  padding-block: var(--space-7);
  border-block: 1px solid var(--line);
}
.facts__item { display: grid; gap: var(--space-2); }
.facts__num {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2rem, 3vw, 3rem);
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1;
}
.facts__label {
  font-family: var(--font-mono);
  font-weight: var(--weight-regular);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}

/* ============================================================
   SCENARIO BLOCK
   ============================================================ */
.scenario {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-8);
  align-items: start;
  padding: var(--space-8);
  background:
    linear-gradient(#11131a, #11131a) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
}
.scenario__label {
  font-family: var(--font-mono); font-size: var(--fs-eyebrow);
  color: var(--ink-4); letter-spacing: var(--tracking-caps);
  text-transform: uppercase; margin-bottom: var(--space-3);
}
.scenario__title {
  font-family: var(--font-display); font-weight: var(--weight-bold);
  font-size: var(--fs-h3); color: var(--ink);
  line-height: var(--leading-snug); letter-spacing: var(--tracking-snug);
}
.scenario__desc {
  margin-top: var(--space-4); font-weight: var(--weight-regular);
  color: var(--ink-2); font-size: var(--fs-body);
  line-height: var(--leading-relaxed);
}
.scenario__steps {
  display: flex; flex-direction: column; gap: 1px;
  background: var(--line); border: 1px solid var(--line);
  border-radius: var(--r-sm); overflow: hidden;
}
.scenario__step {
  display: grid; grid-template-columns: 64px 1fr;
  padding: var(--space-4) var(--space-5);
  background: rgba(255,255,255,0.018);
  align-items: baseline;
}
.scenario__step-n {
  font-family: var(--font-mono); font-size: var(--fs-eyebrow);
  color: var(--ink-4); letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.scenario__step-t {
  font-family: var(--font-display); font-weight: var(--weight-bold);
  font-size: var(--fs-body); color: var(--ink);
  letter-spacing: var(--tracking-snug);
}
@media (max-width: 880px) {
  .scenario { grid-template-columns: 1fr; padding: var(--space-6); }
}

/* ============================================================
   DIVIDER
   ============================================================ */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-2), transparent);
  margin-block: var(--space-9);
}

/* ============================================================
   BIG STATEMENT (closing)
   ============================================================ */
.statement {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-closing);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 22ch;
}
.statement--center { text-align: center; max-width: 24ch; margin-inline: auto; }
.statement em {
  color: transparent;
  background: var(--grad-rai-text);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  margin-top: var(--space-10);
  padding-block: var(--space-8) var(--space-6);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(255,255,255,0.015));
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--space-7);
  padding-bottom: var(--space-7);
}
@media (max-width: 880px) { .site-footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 720px) { .site-footer__grid { grid-template-columns: 1fr; } }
.site-footer__col h6 {
  font-family: var(--font-mono);
  font-weight: var(--weight-regular);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: var(--space-4);
}
.site-footer__col ul li { padding: 6px 0; }
.site-footer__col a {
  font-family: var(--font-display);
  font-weight: var(--weight-regular);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--ink);
  font-size: var(--fs-footer-link);
}
.site-footer__col a:hover { color: var(--rai-78); }
.site-footer__bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: var(--space-5); flex-wrap: wrap;
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--fs-footer);
  color: var(--ink-4);
}
.site-footer__brand {
  display: flex; align-items: center; gap: 14px; margin-bottom: var(--space-4);
}
.site-footer__brand img { height: 38px; }
.site-footer__tag {
  font-family: var(--font-body); font-weight: var(--weight-regular);
  font-size: var(--fs-body-sm); color: var(--ink-2); max-width: 36ch;
  line-height: var(--leading-relaxed);
}

/* ============================================================
   FORMS — gradient frames (container + every input)
   ============================================================ */
.form {
  display: grid;
  gap: var(--space-4);
  background:
    linear-gradient(#11131a, #11131a) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  padding: var(--space-7);
}
.form__row { display: grid; gap: var(--space-2); }
.form__row--double { grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 700px) { .form__row--double { grid-template-columns: 1fr; } }
.form__label {
  font-family: var(--font-mono);
  font-weight: var(--weight-regular);
  font-size: var(--fs-form-label);
  letter-spacing: var(--tracking-caps);
  color: var(--ink-4);
  text-transform: uppercase;
}
.form__req { color: var(--rai-26); margin-left: 4px; }
.form__input,
.form__textarea,
.form__select {
  width: 100%;
  background:
    linear-gradient(#0a0b10, #0a0b10) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  color: var(--ink);
  border-radius: var(--r-sm);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-weight: var(--weight-light);
  font-size: var(--fs-form-input);
  line-height: 1.4;
  transition: box-shadow var(--t-med) var(--ease-std);
}
.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(197, 146, 235, 0.25);
}
.form__textarea { min-height: 140px; resize: vertical; }

/* Success banner — shown on careers.html?sent=1 */
.form-success {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-5);
  background: #11131a;
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  color: var(--ink);
}
.form-success__icon {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--grad-rai-hero);
  color: #0a0b0e;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 18px;
  flex-shrink: 0;
}
.form-success__body { display: flex; flex-direction: column; gap: 4px; }
.form-success__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 16px;
  color: var(--ink);
}
.form-success__text {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: 14px;
  color: var(--ink-2);
}

/* Neutral form variant — plain dark borders, no gradient outline */
.form.form--neutral {
  background: #11131a;
  border: 1px solid var(--line-2);
}
.form--neutral .form__input,
.form--neutral .form__textarea,
.form--neutral .form__select {
  background: #0a0b10;
  border: 1px solid var(--line-2);
}
.form--neutral .form__input:focus,
.form--neutral .form__textarea:focus,
.form--neutral .form__select:focus {
  border-color: rgba(255, 255, 255, 0.32);
  box-shadow: 0 0 0 3px rgba(197, 146, 235, 0.18);
}
.form__consent {
  display: flex; align-items: flex-start; gap: 10px;
  font-family: var(--font-body); font-weight: var(--weight-regular);
  font-size: 14px; color: var(--ink-2);
}
.form__consent input { margin-top: 4px; accent-color: var(--rai-52); }
.form__submit { justify-self: start; margin-top: var(--space-2); }

/* ============================================================
   BADGE / PILL
   ============================================================ */
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.pill__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--rai-100);
  box-shadow: 0 0 12px var(--rai-100);
}
.pill__dot--rose {
  background: var(--rai-26);
  box-shadow: 0 0 12px var(--rai-26);
}

/* ============================================================
   DIAGRAM (Intelligence layer schematic)
   ============================================================ */
.diagram {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  background:
    linear-gradient(#11131a, #11131a) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  overflow: hidden;
}
.diagram__layer {
  background: transparent;
  padding: var(--space-5) var(--space-6);
  display: grid; grid-template-columns: 200px 1fr auto;
  gap: var(--space-5);
  align-items: center;
  border-top: 1px solid var(--line);
}
.diagram__layer:first-child { border-top: 0; }
.diagram__layer--accent {
  background: linear-gradient(90deg, rgba(124,196,214,0.06), rgba(197,146,235,0.04));
  border-left: 2px solid var(--rai-52);
}
.diagram__label {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--ink-4);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.diagram__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--fs-h4);
  color: var(--ink);
  letter-spacing: var(--tracking-snug);
}
.diagram__desc {
  grid-column: 1 / -1;
  margin-top: 6px;
  font-family: var(--font-body); font-weight: var(--weight-regular);
  font-size: var(--fs-body); color: var(--ink-2);
  max-width: 72ch;
  line-height: var(--leading-relaxed);
}
.diagram__chip {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: var(--tracking-caps);
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--ink-4);
  text-transform: uppercase;
}
@media (max-width: 700px) {
  .diagram__layer { grid-template-columns: 1fr; }
  .diagram__chip { justify-self: start; }
}

/* ============================================================
   DIAGRAM — circles variant (.diagram--circles)
   5 primitives as a wavy row of circular nodes.
   ============================================================ */
.diagram.diagram--circles {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
  background: none;
  border: 0;
  border-radius: 0;
  overflow: visible;
  padding-block: var(--space-7);
}
.diagram--circles .diagram__layer {
  position: relative;
  aspect-ratio: 1;
  border-radius: 50%;
  padding: var(--space-5);
  background:
    radial-gradient(circle at 30% 28%, #161922 0%, #0a0b10 78%) padding-box,
    var(--grad-rai) border-box;
  border: 1.5px solid transparent;
  border-left-width: 1.5px;          /* override row variant */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 8px;
  isolation: isolate;
  overflow: hidden;
  transition: transform var(--t-med) var(--ease-std),
              box-shadow var(--t-med) var(--ease-std);
}
.diagram--circles .diagram__layer--accent {
  background:
    radial-gradient(circle at 30% 28%, #161922 0%, #0a0b10 78%) padding-box,
    var(--grad-rai) border-box;
}
.diagram--circles .diagram__layer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-rai-hero);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-std);
  z-index: -1;
  border-radius: 50%;
}
.diagram--circles .diagram__layer:hover::before { opacity: 0.95; }
.diagram--circles .diagram__layer:hover .diagram__label,
.diagram--circles .diagram__layer:hover .diagram__title,
.diagram--circles .diagram__layer:hover .diagram__chip,
.diagram--circles .diagram__layer:hover .diagram__desc { color: #0a0b0e; }
.diagram--circles .diagram__layer:hover .diagram__chip {
  border-color: rgba(10, 11, 14, 0.3);
  color: #0a0b0e;
}

/* Re-size text to fit inside a circle */
.diagram--circles .diagram__label {
  font-size: 10px;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-4);
  transition: opacity var(--t-fast) var(--ease-std);
}
.diagram--circles .diagram__title {
  font-size: clamp(13px, 1.2vw, 17px);
  line-height: 1.15;
  letter-spacing: var(--tracking-snug);
  max-width: 95%;
  transition: opacity var(--t-fast) var(--ease-std);
}
.diagram--circles .diagram__chip {
  font-size: 9.5px;
  padding: 3px 8px;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--ink-4);
  transition: opacity var(--t-fast) var(--ease-std), color var(--t-med) var(--ease-std), border-color var(--t-med) var(--ease-std);
}

/* Description hidden by default — appears on hover as overlay */
.diagram--circles .diagram__desc {
  position: absolute;
  inset: 10% 8%;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: clamp(10px, 0.85vw, 12.5px);
  line-height: 1.35;
  color: var(--ink-2);
  opacity: 0;
  transition: opacity var(--t-med) var(--ease-std), color var(--t-med) var(--ease-std);
  pointer-events: none;
  z-index: 2;
  max-width: none;
}
.diagram--circles .diagram__layer:hover .diagram__desc { opacity: 1; }
.diagram--circles .diagram__layer:hover .diagram__label,
.diagram--circles .diagram__layer:hover .diagram__title,
.diagram--circles .diagram__layer:hover .diagram__chip { opacity: 0; }

/* Wave layout — alternating vertical offsets */
.diagram--circles .diagram__layer:nth-child(odd)  { transform: translateY(-22px); }
.diagram--circles .diagram__layer:nth-child(even) { transform: translateY(22px);  }
.diagram--circles .diagram__layer:nth-child(odd):hover  { transform: translateY(-26px) scale(1.06); box-shadow: 0 18px 44px -14px rgba(197,146,235,0.55); }
.diagram--circles .diagram__layer:nth-child(even):hover { transform: translateY(18px)  scale(1.06); box-shadow: 0 18px 44px -14px rgba(197,146,235,0.55); }

@media (max-width: 960px) {
  .diagram.diagram--circles { grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
  .diagram--circles .diagram__layer:nth-child(odd),
  .diagram--circles .diagram__layer:nth-child(even) { transform: none; }
  .diagram--circles .diagram__layer:nth-child(odd):hover,
  .diagram--circles .diagram__layer:nth-child(even):hover { transform: scale(1.05); }
}
@media (max-width: 600px) {
  .diagram.diagram--circles { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity   var(--t-slow) var(--ease-rev),
    transform var(--t-slow) var(--ease-rev);
  will-change: opacity, transform;
}
.reveal.is-visible,
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}
.reveal[data-delay="1"] { transition-delay: 80ms; }
.reveal[data-delay="2"] { transition-delay: 160ms; }
.reveal[data-delay="3"] { transition-delay: 240ms; }
.reveal[data-delay="4"] { transition-delay: 320ms; }
.reveal[data-delay="5"] { transition-delay: 360ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ============================================================
   PORTRAIT MODULE (optional — reserved for pages with portrait)
   ============================================================ */
.portrait {
  position: relative;
  aspect-ratio: 4 / 5;
  max-width: 420px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-portrait);
}
.portrait::after {
  content: '';
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(60,90,160,0.15) 0%, transparent 30%),
    linear-gradient(0deg,   rgba(6,7,10,0.55)  0%, transparent 45%);
  pointer-events: none;
}
.portrait__corner {
  position: absolute; width: 18px; height: 18px;
  border: 1px solid var(--ink);
  pointer-events: none;
}
.portrait__corner--tl { top: 8px;    left: 8px;    border-right: 0; border-bottom: 0; }
.portrait__corner--tr { top: 8px;    right: 8px;   border-left: 0;  border-bottom: 0; }
.portrait__corner--bl { bottom: 8px; left: 8px;    border-right: 0; border-top: 0; }
.portrait__corner--br { bottom: 8px; right: 8px;   border-left: 0;  border-top: 0; }

/* ============================================================
   UTILS
   ============================================================ */
.flex          { display: flex; }
.flex--col     { flex-direction: column; }
.flex--center  { align-items: center; justify-content: center; }
.flex--between { justify-content: space-between; align-items: center; }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

/* Section padding modifiers */
.section--pb-half { padding-bottom: calc(var(--pad-y) / 2); }
.section--pt-half { padding-top:    calc(var(--pad-y) / 2); }

.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-7 { margin-top: var(--space-7); }
.mt-8 { margin-top: var(--space-8); }

.text-center { text-align: center; }