/* ==========================================================================
   LUCID COMPUTING — TECHNICAL SWISS DESIGN SYSTEM
   Generated from tokens.w3c.json. This is the single shared stylesheet for
   the live site (index, research, careers, clusters, login).
   Rules of the system:
     - No border-radius, anywhere. The system refuses rounded corners.
     - Hairline rules divide; they never decorate.
     - Amber is used surgically — one accent per view, never for large fills.
     - Display type is JetBrains Mono; body is IBM Plex Sans.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* color.paper — warm ivory family, tinted toward the amber accent */
  --paper-1: #F6F1E7;
  --paper-2: #EEE7D6;
  --paper-3: #E3D9C2;
  /* color.ink */
  --ink-1: #1E1F22;
  --ink-2: #5F6165;
  --ink-3: #93959A;
  /* color.amber */
  --amber: #C9A227;
  --amber-ink: #8A6E12;      /* accent on light backgrounds where contrast matters */
  /* color.rule */
  --rule: rgba(30, 31, 34, 0.10);
  --rule-strong: rgba(30, 31, 34, 0.22);
  /* color.feedback */
  --destructive: #B4321C;
  /* semantic */
  --background: var(--paper-1);
  --foreground: var(--ink-1);
  --muted: var(--paper-2);
  --muted-foreground: var(--ink-2);
  --primary: var(--ink-1);
  --primary-foreground: var(--paper-1);
  --accent: var(--amber);
  --ring: var(--amber);

  /* font */
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-display: var(--font-mono);

  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 15px;
  --text-lg: 17px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  --text-4xl: 44px;
  --text-5xl: 60px;
  --text-6xl: 80px;

  --leading-tight: 1.02;
  --leading-snug: 1.2;
  --leading-normal: 1.55;
  --leading-relaxed: 1.7;

  --tracking-display: -0.03em;
  --tracking-heading: -0.02em;
  --tracking-label: 0.02em;

  /* spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;

  /* border + shadow */
  --border-hairline: 1px solid var(--rule);
  --border-strong: 1px solid var(--rule-strong);
  --border-ink: 1px solid var(--ink-1);
  --shadow-flat: 0 0 0 1px var(--rule);
  --shadow-offset: 4px 4px 0 0 var(--ink-1);

  /* motion */
  --duration-fast: 120ms;
  --duration-base: 180ms;
  --ease-mechanical: cubic-bezier(0.2, 0, 0, 1);

  /* layout */
  --container: 1280px;
  --nav-height: 64px;
}

/* --------------------------------------------------------------------------
   2. RESET + BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: 0 !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-normal);
  color: var(--foreground);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Halftone dot canvas — programmable, no image assets.
   One 8px base grid; the overlay layers use pitches that are MULTIPLES of
   8px, so every dot sits on the same grid but each cell is hit by a
   different subset of layers. The varying subset-sums read as random
   per-dot brightness (some strong, some faint), like scattered halftone.
   A soft repeating radial mask adds large-scale cloudiness on top. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(30, 31, 34, 0.04) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.05) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.06) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.05) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.07) 1px, transparent 1.3px);
  background-size: 5px 5px, 10px 10px, 15px 15px, 25px 25px, 35px 35px;
  background-position: 0 0, 5px 5px, 10px 0, 5px 15px, 20px 10px;
  -webkit-mask-image: radial-gradient(420px 340px at 50% 50%, #000 25%, rgba(0, 0, 0, 0.55) 65%, rgba(0, 0, 0, 0.85) 100%);
  mask-image: radial-gradient(420px 340px at 50% 50%, #000 25%, rgba(0, 0, 0, 0.55) 65%, rgba(0, 0, 0, 0.85) 100%);
  -webkit-mask-size: 840px 680px;
  mask-size: 840px 680px;
}

::selection {
  background: var(--ink-1);
  color: var(--paper-1);
}

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

img, svg, canvas { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1, .h1, h2, .h2, h3, .h3, h4, .h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--ink-1);
}

h1, .h1 {
  font-size: clamp(var(--text-3xl), 4.5vw, var(--text-5xl));
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
}

h2, .h2 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-4xl));
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-heading);
}

h3, .h3 {
  font-size: var(--text-2xl);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-heading);
}

h4, .h4 {
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-heading);
}

p { color: var(--ink-2); }
p strong { color: var(--ink-1); font-weight: 600; }

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--ink-2);
}

.text-ink   { color: var(--ink-1); }
.text-muted { color: var(--ink-3); }
.text-accent { color: var(--amber-ink); }

/* Mono metadata / labels — the system's voice for structure */
.label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
}

.label--accent { color: var(--amber-ink); }
.label--ink    { color: var(--ink-1); }

/* Eyebrow: label + index number above a section heading */
.eyebrow {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.eyebrow::before {
  content: "";
  width: var(--space-6);
  height: 1px;
  background: var(--ink-1);
  align-self: center;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

a.link {
  color: var(--ink-1);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  padding-bottom: 1px;
  transition: color var(--duration-fast) var(--ease-mechanical),
              border-color var(--duration-fast) var(--ease-mechanical);
}
a.link:hover { color: var(--amber-ink); border-color: var(--amber-ink); }

/* --------------------------------------------------------------------------
   4. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-24) 0;
  border-top: var(--border-hairline);
}
.section--flush { border-top: none; }
.section--alt {
  background-image:
    radial-gradient(circle, rgba(30, 31, 34, 0.04) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.06) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(30, 31, 34, 0.05) 1px, transparent 1.3px);
  background-size: 5px 5px, 15px 15px, 25px 25px;
  background-position: 0 0, 5px 10px, 15px 5px;
  background-color: var(--paper-2);
}
.section--tight { padding: var(--space-16) 0; }

/* Inverted (ink) section — used once per page at most, e.g. the CTA */
.section--ink {
  /* paper-dot halftone, same language as the page canvas */
  background-image:
    radial-gradient(circle, rgba(246, 241, 231, 0.04) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(246, 241, 231, 0.05) 1px, transparent 1.3px),
    radial-gradient(circle, rgba(246, 241, 231, 0.045) 1px, transparent 1.3px);
  background-size: 5px 5px, 15px 15px, 25px 25px;
  background-position: 0 0, 5px 10px, 15px 5px;
  background-color: var(--ink-1);
  color: var(--paper-1);
  border-top: none;
}
.section--ink h1, .section--ink h2, .section--ink h3, .section--ink h4 { color: var(--paper-1); }
.section--ink p { color: rgba(249, 249, 250, 0.72); }
.section--ink .label { color: rgba(249, 249, 250, 0.55); }
.section--ink .label--accent { color: var(--amber); }

.section-head {
  max-width: 760px;
  margin-bottom: var(--space-16);
}
.section-head > h2 { margin-bottom: var(--space-4); }
.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-head--center .eyebrow { justify-content: center; }

/* Grids — collapse to one column on phones */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.grid-split { display: grid; grid-template-columns: 5fr 7fr; gap: var(--space-16); align-items: start; }
.grid-split--even { grid-template-columns: 1fr 1fr; }

.rule    { border: none; border-top: var(--border-hairline); }
.rule--strong { border-top: var(--border-strong); }

/* --------------------------------------------------------------------------
   5. NAVBAR
   -------------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-6);
  background: var(--paper-1);
  border-bottom: var(--border-hairline);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}
.nav-logo { width: 24px; height: 24px; }
.nav-wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-1);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
  color: var(--ink-2);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-mechanical);
}
.nav-link:hover, .nav-link.active { color: var(--ink-1); }
.nav-link.active { text-decoration: underline; text-underline-offset: 6px; text-decoration-color: var(--amber); }

.nav-cta-btn {
  padding: var(--space-2) var(--space-4);
  background: var(--ink-1);
  color: var(--paper-1);
  border: var(--border-ink);
  transition: background var(--duration-fast) var(--ease-mechanical),
              color var(--duration-fast) var(--ease-mechanical);
}
.nav-cta-btn:hover { background: transparent; color: var(--ink-1); }

/* Dropdown */
.nav-item-dropdown { position: relative; }
.nav-link.has-dropdown::after {
  content: " ↓";
  font-size: 0.85em;
  color: var(--ink-3);
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-3));
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--paper-1);
  border: var(--border-strong);
  box-shadow: var(--shadow-offset);
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-fast) var(--ease-mechanical),
              visibility var(--duration-fast) var(--ease-mechanical);
}
.nav-item-dropdown::after {
  /* invisible hover bridge between link and menu */
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 100%;
  height: var(--space-3);
}
.nav-item-dropdown:hover .dropdown-menu,
.nav-item-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
}
.dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
  color: var(--ink-2);
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-mechanical),
              color var(--duration-fast) var(--ease-mechanical);
}
.dropdown-link:hover {
  background: var(--paper-2);
  color: var(--ink-1);
}

/* Hamburger */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  position: relative;
  z-index: 102;
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  position: absolute;
  left: 10px;
  width: 20px;
  height: 2px;
  background: var(--ink-1);
  transition: transform var(--duration-base) var(--ease-mechanical),
              opacity var(--duration-base) var(--ease-mechanical);
}
.nav-toggle-icon { top: 19px; }
.nav-toggle-icon::before { left: 0; top: -6px; }
.nav-toggle-icon::after  { left: 0; top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after  { transform: translateY(-6px) rotate(-45deg); }

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(30, 31, 34, 0.4);
  z-index: 99;
}
.nav-overlay.is-visible { display: block; }

/* --------------------------------------------------------------------------
   6. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-mechanical),
              color var(--duration-fast) var(--ease-mechanical),
              box-shadow var(--duration-fast) var(--ease-mechanical),
              transform var(--duration-fast) var(--ease-mechanical);
}

.btn--primary {
  background: var(--primary);
  color: var(--primary-foreground);
  border: var(--border-ink);
}
.btn--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-offset);
}
.btn--primary:active { transform: translate(0, 0); box-shadow: none; }

.btn--ghost {
  background: transparent;
  color: var(--ink-1);
  border: var(--border-ink);
}
.btn--ghost:hover { background: var(--ink-1); color: var(--paper-1); }

/* On ink sections, invert — except inside paper panels/forms, which keep the ink button */
.section--ink .btn--primary { background: var(--paper-1); color: var(--ink-1); border-color: var(--paper-1); }
.section--ink .btn--primary:hover { box-shadow: 4px 4px 0 0 var(--amber); }
.section--ink form .btn--primary,
.section--ink .panel .btn--primary {
  background: var(--ink-1);
  color: var(--paper-1);
  border-color: var(--ink-1);
}
.section--ink form .btn--primary:hover,
.section--ink .panel .btn--primary:hover { box-shadow: var(--shadow-offset); }
.section--ink .btn--ghost { color: var(--paper-1); border-color: var(--paper-1); }
.section--ink .btn--ghost:hover { background: var(--paper-1); color: var(--ink-1); }

/* --------------------------------------------------------------------------
   7. PANELS, CARDS, LISTS
   -------------------------------------------------------------------------- */
.panel {
  background: var(--paper-1);
  border: var(--border-strong);
  padding: var(--space-8);
}
.panel--inset  { background: var(--paper-3); border: var(--border-hairline); }
.panel--muted  { background: var(--paper-2); border: var(--border-hairline); }
.panel--offset { box-shadow: var(--shadow-offset); }
.panel--flush  { padding: 0; }

/* Card with mono header strip — used for mock UI screens and spec cards */
.card { border: var(--border-strong); background: var(--paper-1); }
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-hairline);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--paper-2);
}
.card-body { padding: var(--space-6); }

/* Hairline-divided feature list (rows) */
.feature-list { border-top: var(--border-hairline); }
.feature-row {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  padding: var(--space-6) 0;
  border-bottom: var(--border-hairline);
}
.feature-row > i, .feature-row > svg {
  flex: none;
  font-size: var(--text-lg);
  color: var(--amber-ink);
  margin-top: 2px;
}
.feature-row h4 { margin-bottom: var(--space-1); font-size: var(--text-base); }
.feature-row p { font-size: var(--text-sm); }

/* Stat blocks */
.stat { padding: var(--space-6); border: var(--border-hairline); background: var(--paper-1); }
.stat-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-heading);
  color: var(--ink-1);
}
.stat-label { margin-top: var(--space-2); }

/* Badges / chips */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  border: var(--border-hairline);
  color: var(--ink-2);
  background: var(--paper-2);
  white-space: nowrap;
}
.badge--ok     { color: var(--amber-ink); border-color: var(--amber); background: transparent; }
.badge--ink    { color: var(--paper-1); background: var(--ink-1); border-color: var(--ink-1); }
.badge--danger { color: var(--destructive); border-color: currentColor; background: transparent; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  border: var(--border-hairline);
  background: var(--paper-1);
  color: var(--ink-2);
}

/* --------------------------------------------------------------------------
   8. TABS
   -------------------------------------------------------------------------- */
.tabs { display: flex; border: var(--border-strong); border-bottom: none; }
.tab {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--paper-2);
  border-right: var(--border-hairline);
  transition: background var(--duration-fast) var(--ease-mechanical),
              color var(--duration-fast) var(--ease-mechanical);
}
.tab:last-child { border-right: none; }
.tab:hover { color: var(--ink-1); }
.tab.active {
  background: var(--paper-1);
  color: var(--ink-1);
  box-shadow: inset 0 2px 0 0 var(--amber);
}
.tab-panel {
  display: none;
  border: var(--border-strong);
  background: var(--paper-1);
  padding: var(--space-10);
}
.tab-panel.active { display: block; }

/* --------------------------------------------------------------------------
   9. TABLES
   -------------------------------------------------------------------------- */
.table-wrap { overflow-x: auto; border: var(--border-strong); }
table.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.table th {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  background: var(--paper-2);
  border-bottom: var(--border-strong);
}
.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-hairline);
  color: var(--ink-2);
}
.table td:first-child { color: var(--ink-1); }
.table tr:last-child td { border-bottom: none; }

/* --------------------------------------------------------------------------
   10. FORMS
   -------------------------------------------------------------------------- */
.field { display: flex; flex-direction: column; gap: var(--space-2); }
.field label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-2);
}
.field input,
.field textarea,
.field select {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--ink-1);
  background: var(--paper-1);
  border: var(--border-strong);
  padding: var(--space-3) var(--space-4);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-mechanical),
              box-shadow var(--duration-fast) var(--ease-mechanical);
}
.field input::placeholder,
.field textarea::placeholder { color: var(--ink-3); }
.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--ink-1);
  box-shadow: 0 0 0 1px var(--ink-1);
}
.field textarea { resize: vertical; min-height: 96px; }

.form-message { font-size: var(--text-sm); line-height: var(--leading-normal); padding: var(--space-3) var(--space-4); }
.form-message.success { border: 1px solid var(--amber-ink); color: var(--amber-ink); }
.form-message.error   { border: 1px solid var(--destructive); color: var(--destructive); }

/* --------------------------------------------------------------------------
   11. HERO
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-24) 0;
  min-height: calc(88vh - var(--nav-height));
  display: flex;
  align-items: center;
}
#hero-animation {
  position: absolute;
  inset: 0;
  opacity: 0.16;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-kicker { margin-bottom: var(--space-6); }
.hero h1 { max-width: 18ch; }
.hero .lead { max-width: 560px; margin-top: var(--space-6); }
.hero-actions { display: flex; gap: var(--space-4); margin-top: var(--space-10); flex-wrap: wrap; }

/* --------------------------------------------------------------------------
   12. FOOTER
   -------------------------------------------------------------------------- */
.footer {
  border-top: var(--border-strong);
  padding: var(--space-10) 0;
}
.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-links { display: flex; gap: var(--space-6); flex-wrap: wrap; }
.footer a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--ink-3);
  text-decoration: none;
}
.footer a:hover { color: var(--ink-1); }

/* --------------------------------------------------------------------------
   13. MOTION / REVEAL
   (animation.js toggles .visible on .animate-up via IntersectionObserver)
   -------------------------------------------------------------------------- */
.animate-up {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 480ms var(--ease-mechanical),
              transform 480ms var(--ease-mechanical);
}
.animate-up.visible { opacity: 1; transform: translateY(0); }
.animate-up.delay-1 { transition-delay: 90ms; }
.animate-up.delay-2 { transition-delay: 180ms; }
.animate-up.delay-3 { transition-delay: 270ms; }

@media (prefers-reduced-motion: reduce) {
  .animate-up { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* --------------------------------------------------------------------------
   14. RACK SKYLINE ILLUSTRATION
   Mirrored server racks descending toward a lit corridor — used on the
   landing #clusters section and the validation-cluster hero. Geometry
   (left/right/top/width/height and the rack-unit pitch via --pitch) is
   set inline per rack; everything visual lives here.
   -------------------------------------------------------------------------- */
.skyline {
  position: relative;
  border: var(--border-strong);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.skyline-glow {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 15%;
  height: 24%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(201, 162, 39, 0.32), rgba(201, 162, 39, 0.1) 55%, transparent 75%);
  filter: blur(1px);
}
.skyline-beam {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 30%;
  height: 48%;
  transform: translateX(-50%);
  background: linear-gradient(rgba(201, 162, 39, 0.2), transparent);
  clip-path: polygon(42% 0, 58% 0, 100% 100%, 0 100%);
  filter: blur(2px);
}
.skyline-rack {
  position: absolute;
  border: 1px solid rgba(30, 31, 34, 0.4);
  border-top: 2px solid rgba(201, 162, 39, 0.85);
  background-image:
    repeating-linear-gradient(0deg, rgba(30, 31, 34, 0.16) 0 1px, transparent 1px var(--pitch, 8px)),
    linear-gradient(180deg, rgba(30, 31, 34, 0.06), rgba(30, 31, 34, 0.01));
  box-shadow: inset 0 0 12px rgba(30, 31, 34, 0.05);
}

/* --------------------------------------------------------------------------
   15. RESPONSIVE
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-split, .grid-split--even { grid-template-columns: 1fr; gap: var(--space-10); }
}

@media (max-width: 768px) {
  :root { --nav-height: 56px; }

  .section { padding: var(--space-16) 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .tabs { flex-direction: column; border-bottom: var(--border-strong); }
  .tab { border-right: none; border-bottom: var(--border-hairline); text-align: left; }
  .tab:last-child { border-bottom: none; }
  .tab-panel { padding: var(--space-6); }
  .hero { min-height: auto; padding: var(--space-16) 0; }

  /* Mobile nav: slide-down panel */
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    z-index: 101;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper-1);
    border-bottom: var(--border-strong);
    padding: var(--space-2) 0;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links .nav-link {
    padding: var(--space-4) var(--space-6);
    border-bottom: var(--border-hairline);
  }
  .nav-links .nav-link:last-child { border-bottom: none; }
  .nav-cta-btn { margin: var(--space-3) var(--space-6); text-align: center; border: var(--border-ink); }
  .nav-item-dropdown .dropdown-menu {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    border-bottom: var(--border-hairline);
    padding: 0;
    display: none;
    opacity: 1;
    visibility: visible;
    background: var(--paper-2);
  }
  .nav-item-dropdown.is-open .dropdown-menu { display: block; }
  .dropdown-link { padding: var(--space-3) var(--space-10); }
}