/* ACUDA — corporate site
   Plain CSS, no build step. Tokens first, then layout, then components. */

/* ----------------------------------------------------------------- tokens */
:root {
  --bg: #fafaf9;
  --bg-alt: #f2f2f0;
  --surface: #ffffff;
  --ink: #0b0b0c;
  --ink-2: #3a3a3f;
  --muted: #6b6b73;
  --line: rgba(11, 11, 12, 0.09);
  --line-strong: rgba(11, 11, 12, 0.16);
  --accent: #3b5bdb;
  --accent-ink: #ffffff;
  --inverse-bg: #0b0b0c;
  --inverse-ink: #f5f5f4;
  --inverse-muted: #a1a1a8;
  --focus: #3b5bdb;
  --header-bg: rgba(250, 250, 249, 0.78);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter,
          Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI",
          Inter, Roboto, "Helvetica Neue", Arial, sans-serif;

  --container: 72rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(5rem, 12vw, 9.5rem);
  --radius: 1.25rem;
  --radius-sm: 0.75rem;
  --header-h: 4rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0c;
    --bg-alt: #111113;
    --surface: #151518;
    --ink: #f5f5f4;
    --ink-2: #d4d4d8;
    --muted: #9a9aa3;
    --line: rgba(255, 255, 255, 0.08);
    --line-strong: rgba(255, 255, 255, 0.16);
    --accent: #7c93f5;
    --accent-ink: #0b0b0c;
    --inverse-bg: #f5f5f4;
    --inverse-ink: #0b0b0c;
    --inverse-muted: #52525b;
    --focus: #9aabff;
    --header-bg: rgba(11, 11, 12, 0.72);
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
h1, h2, h3, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.container {
  width: 100%;
  max-width: calc(var(--container) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: max(var(--gutter), env(safe-area-inset-left, 0px))
                  max(var(--gutter), env(safe-area-inset-right, 0px));
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -4rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ------------------------------------------------------------------ brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  font-size: 0.95rem;
}
.brand-mark { width: 1.75rem; height: 1.75rem; flex: none; }
.brand-mark-bg { fill: var(--ink); }
.brand-mark-stroke {
  fill: none;
  stroke: var(--bg);
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.brand-mark-node { fill: var(--accent); }

/* ----------------------------------------------------------------- header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-list a {
  display: inline-block;
  padding: 0.5rem 0.875rem;
  font-size: 0.9375rem;
  color: var(--ink-2);
  border-radius: 999px;
  transition: color 0.2s, background-color 0.2s;
}
.nav-list a:hover { color: var(--ink); background: var(--line); }
.nav-list .nav-cta {
  margin-left: 0.5rem;
  color: var(--bg);
  background: var(--ink);
}
.nav-list .nav-cta:hover { color: var(--bg); background: var(--ink-2); }

.nav-toggle { display: none; }

/* Mobile navigation — only collapses when JS is available to open it. */
@media (max-width: 47.99rem) {
  .js .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 2.75rem; height: 2.75rem;
    margin-right: -0.5rem;
    padding: 0 0.75rem;
    background: none;
    border: 0;
    border-radius: 999px;
    color: var(--ink);
    cursor: pointer;
  }
  .nav-toggle-bar {
    display: block;
    height: 1.5px;
    width: 100%;
    background: currentColor;
    border-radius: 2px;
    transition: transform 0.3s var(--ease);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-of-type { transform: translateY(3.75px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-of-type  { transform: translateY(-3.75px) rotate(-45deg); }

  .js .site-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--gutter) 1.5rem;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-0.5rem);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0s 0.25s;
  }
  .js .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }
  .js .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .js .nav-list a {
    display: block;
    padding: 0.95rem 0.25rem;
    font-size: 1.25rem;
    color: var(--ink);
    border-radius: 0;
    border-bottom: 1px solid var(--line);
  }
  .js .nav-list a:hover { background: none; }
  .js .nav-list .nav-cta {
    margin: 1rem 0 0;
    text-align: center;
    border-radius: 999px;
    border-bottom: 0;
    font-size: 1rem;
  }

  /* No-JS fallback: links simply sit in a compact row. */
  html:not(.js) .nav-list a { padding: 0.4rem 0.5rem; font-size: 0.875rem; }
  html:not(.js) .nav-list .nav-cta { margin-left: 0; }
}

/* ---------------------------------------------------------------- buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0 1.5rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 550;
  white-space: nowrap;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, transform 0.2s var(--ease);
}
.button svg {
  width: 1rem; height: 1rem;
  fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
  transition: transform 0.25s var(--ease);
}
.button:hover svg { transform: translateX(3px); }
.button:active { transform: scale(0.98); }

.button-primary { background: var(--ink); color: var(--bg); }
.button-primary:hover { background: var(--ink-2); }

.button-secondary {
  color: var(--ink);
  border: 1px solid var(--line-strong);
}
.button-secondary:hover { border-color: var(--ink); }

.button-inverse { background: var(--inverse-ink); color: var(--inverse-bg); }
.button-inverse:hover { opacity: 0.9; }

/* ------------------------------------------------------------------- hero */
.hero {
  position: relative;
  padding-block: clamp(3.5rem, 10vw, 8rem) clamp(4rem, 10vw, 7rem);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--muted);
}
.eyebrow-dot {
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7.2vw, 5.75rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
  font-weight: 650;
  text-wrap: balance;
}
.hero-lede {
  max-width: 34rem;
  margin-top: 1.75rem;
  font-size: clamp(1.125rem, 1.6vw, 1.3125rem);
  line-height: 1.55;
  color: var(--muted);
  text-wrap: pretty;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.hero-visual { position: relative; }
.orbit { width: 100%; height: auto; overflow: visible; }
.orbit-grid circle,
.orbit-grid path { fill: none; stroke: var(--line); stroke-width: 1; }
.orbit-dash {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
  stroke-dasharray: 2 7;
}
.orbit-node { fill: var(--ink); }
.orbit-node-muted { fill: var(--muted); opacity: 0.55; }
.orbit-node-accent { fill: var(--accent); }
.orbit-links path { fill: none; stroke: var(--line-strong); stroke-width: 1; }
.orbit-core-bg { fill: var(--ink); }
.orbit-core-stroke {
  fill: none; stroke: var(--bg); stroke-width: 3.2;
  stroke-linecap: round; stroke-linejoin: round;
}
.orbit-core-node { fill: var(--accent); }

.orbit-ring { transform-origin: 240px 240px; transform-box: view-box; }
.orbit-ring-outer { animation: spin 120s linear infinite; }
.orbit-ring-mid   { animation: spin 80s linear infinite reverse; }

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

@media (max-width: 55.99rem) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual {
    order: -1;
    width: min(20rem, 72vw);
    margin: 0 auto 0.5rem;
  }
}
@media (max-width: 30rem) {
  .hero-visual { width: min(15rem, 64vw); }
  .hero-actions .button { flex: 1 1 100%; }
}

/* --------------------------------------------------------------- sections */
.section { padding-block: var(--section-y); }
.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--line);
}

.section-head { max-width: 40rem; margin-bottom: clamp(2.5rem, 6vw, 4.5rem); }
.section-kicker {
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 650;
}
.section-lede {
  margin-top: 1.25rem;
  font-size: 1.1875rem;
  color: var(--muted);
}

/* ----------------------------------------------------------- capabilities */
.capabilities {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.capability {
  padding: 2.5rem 2.5rem 2.5rem 0;
}
.capability + .capability {
  padding-left: 2.5rem;
  border-left: 1px solid var(--line);
}
.capability-icon {
  width: 2.5rem; height: 2.5rem;
  margin-bottom: 2.5rem;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.capability-title {
  font-size: 1.375rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 600;
}
.capability-text {
  margin-top: 0.75rem;
  color: var(--muted);
}

@media (max-width: 55.99rem) {
  .capabilities { grid-template-columns: 1fr; }
  .capability,
  .capability + .capability {
    padding: 2rem 0;
    border-left: 0;
  }
  .capability + .capability { border-top: 1px solid var(--line); }
  .capability-icon { margin-bottom: 1.5rem; }
}

/* --------------------------------------------------------------- products */
.products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: 1rem;
}
.product-link {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 15rem;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
a.product-link:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 0 18px 40px -24px rgba(11, 11, 12, 0.25);
}
.product-index {
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.product-name {
  margin-top: auto;
  padding-top: 3rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 650;
}
.product-text {
  margin-top: 0.75rem;
  color: var(--muted);
}
.product-arrow {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  display: grid; place-items: center;
  width: 2.25rem; height: 2.25rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.product-arrow svg {
  width: 0.875rem; height: 0.875rem;
  fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
}
a.product-link:hover .product-arrow {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}

/* ---------------------------------------------------------------- company */
.company { max-width: calc(58rem + 2 * var(--gutter)); }
.company-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5.6vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
  font-weight: 650;
  text-wrap: balance;
}
.company-text {
  max-width: 38rem;
  margin-top: 2rem;
  font-size: clamp(1.125rem, 1.6vw, 1.3125rem);
  line-height: 1.6;
  color: var(--muted);
}

/* -------------------------------------------------------------------- CTA */
.cta { padding-top: 0; }
.cta-panel {
  padding: clamp(3rem, 8vw, 6rem) clamp(1.75rem, 6vw, 5rem);
  background: var(--inverse-bg);
  color: var(--inverse-ink);
  border-radius: calc(var(--radius) * 1.4);
  text-align: center;
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6.4vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
  font-weight: 650;
}
.cta-text {
  margin-top: 1.25rem;
  font-size: 1.1875rem;
  color: var(--inverse-muted);
}
.cta-panel :focus-visible { outline-color: var(--inverse-ink); }

/* ----------------------------------------------------------- contact form */
.contact-form {
  display: grid;
  gap: 1rem;
  max-width: 40rem;
  margin: 2.75rem auto 0;
  text-align: left;
}
.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.field { display: grid; gap: 0.4rem; }
.field label {
  font-size: 0.875rem;
  font-weight: 550;
  color: var(--inverse-ink);
}
.field-optional { font-weight: 400; color: var(--inverse-muted); }
.field input,
.field textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  font: inherit;
  font-size: 1rem; /* >= 16px keeps iOS from zooming on focus */
  color: var(--inverse-ink);
  /* Fallbacks for browsers without color-mix() (Safari < 16.2, Chrome < 111,
     Firefox < 113) — otherwise they fall back to a white UA field with
     light text. */
  background: transparent;
  border: 1px solid var(--inverse-muted);
  background: color-mix(in srgb, var(--inverse-ink) 6%, transparent);
  border: 1px solid color-mix(in srgb, var(--inverse-ink) 18%, transparent);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, background-color 0.2s;
}
.field textarea { resize: vertical; min-height: 8rem; line-height: 1.5; }
.field input:hover,
.field textarea:hover { border-color: color-mix(in srgb, var(--inverse-ink) 34%, transparent); }
.field input:focus-visible,
.field textarea:focus-visible {
  outline: 2px solid var(--inverse-ink);
  outline-offset: 1px;
  border-color: transparent;
  border-radius: var(--radius-sm);
}
/* Honeypot: out of sight and out of the accessibility tree. */
.field-trap {
  position: absolute !important;
  left: -10000px;
  width: 1px; height: 1px;
  overflow: hidden;
}
.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.25rem;
  margin-top: 0.5rem;
}
.form-actions .button { border: 0; cursor: pointer; font-family: inherit; }
.form-actions .button[disabled] { opacity: 0.6; cursor: progress; }
.form-status {
  flex: 1 1 14rem;
  font-size: 0.9375rem;
  color: var(--inverse-muted);
}
.form-status.is-success { color: var(--inverse-ink); }
.form-status.is-error   { color: #f0a3a3; }

@media (prefers-color-scheme: dark) {
  .form-status.is-error { color: #b42318; }
}
@media (max-width: 36rem) {
  .field-row { grid-template-columns: 1fr; }
  .form-actions .button { flex: 1 1 100%; }
}

/* ----------------------------------------------------------------- footer */
.site-footer {
  padding-top: clamp(3rem, 6vw, 4.5rem);
  padding-bottom: max(2rem, env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem 3rem;
}
.footer-tagline {
  max-width: 22rem;
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9375rem;
}
.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
}
.footer-nav a {
  font-size: 0.9375rem;
  color: var(--muted);
  transition: color 0.2s;
}
.footer-nav a:hover { color: var(--ink); }
.footer-legal {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--muted);
}

/* ----------------------------------------------------------------- reveal */
/* Content is fully visible without JS; `.js` opts into the entrance motion. */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------------------------------------------------------- 404 page only */
.notfound {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding-block: 6rem;
}
.notfound .section-title { margin-bottom: 1rem; }
.notfound p { color: var(--muted); margin-bottom: 2rem; }

/* --------------------------------------------------------- reduced motion */
@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;
  }
  .orbit-ring { animation: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}