/* Parallel Neuron — deep purple + forest green, calm and high-contrast.
   Contrast (WCAG): purple #3D2B6B on white ≈ 12:1, green #2F7A5E on white ≈ 5.2:1. */
:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --tint-purple: #f5f2fa;
  --tint-green: #eef6f2;
  --text: #1f1b2d;
  --muted: #5a5570;
  --purple: #3d2b6b;
  --purple-strong: #2e2052;
  --green: #2f7a5e;
  --green-strong: #245f49;
  --border: #e4e0ee;
  --radius: 14px;
  --shadow: 0 8px 28px rgba(61, 43, 107, 0.08);
  --maxw: 1100px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15121f;
    --surface: #1e1a2b;
    --tint-purple: #1b1728;
    --tint-green: #15201c;
    --text: #ece9f5;
    --muted: #a9a3bd;
    --purple: #b9a4f0;
    --purple-strong: #cfc0f7;
    --green: #6cc6a0;
    --green-strong: #8ad6b5;
    --border: #2c2640;
    --shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img,
svg {
  max-width: 100%;
}
a {
  color: var(--green);
}
a:hover {
  color: var(--green-strong);
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}
.narrow {
  max-width: 720px;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 10;
  background: var(--purple);
  color: #fff;
  padding: 10px 14px;
  border-radius: 8px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 22px;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}
.brand svg {
  width: 34px;
  height: 34px;
}
.site-header nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
}
.site-header nav a {
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}
.site-header nav a:hover {
  color: var(--purple);
}
.lang-switch {
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  color: var(--purple);
}
.lang-switch:hover {
  border-color: var(--purple);
  color: var(--purple);
}

/* Hero */
.hero {
  padding: 88px 0 72px;
  background:
    radial-gradient(
      900px 400px at 85% -10%,
      color-mix(in srgb, var(--green) 14%, transparent),
      transparent 70%
    ),
    radial-gradient(
      800px 420px at -10% 10%,
      color-mix(in srgb, var(--purple) 12%, transparent),
      transparent 70%
    );
}
.eyebrow {
  margin: 0 0 14px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
}
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--purple);
  max-width: 16ch;
}
.lede {
  margin: 0 0 30px;
  font-size: 1.2rem;
  color: var(--muted);
  max-width: 62ch;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 999px;
  border: 2px solid transparent;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition:
    background 0.2s ease,
    transform 0.05s ease;
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--green);
  color: #fff;
}
.btn-primary:hover {
  background: var(--green-strong);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--purple);
  border-color: var(--border);
}
.btn-ghost:hover {
  border-color: var(--purple);
  color: var(--purple);
}
@media (prefers-color-scheme: dark) {
  .btn-primary,
  .btn-primary:hover {
    color: #0f1a15;
  }
}

/* Sections */
.section {
  padding: 76px 0;
}
.section-alt {
  background: var(--tint-purple);
}
.section h2 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  color: var(--purple);
}
.section-sub {
  margin: 0 0 36px;
  color: var(--muted);
  max-width: 64ch;
}

.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  list-style: none;
  padding: 0;
  margin: 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  color: var(--text);
}
.card p {
  margin: 0;
  color: var(--muted);
}
.card .icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 14px;
  border-radius: 12px;
  background: var(--tint-green);
  color: var(--green);
  font-weight: 800;
}
.card-accent {
  border-top: 4px solid var(--green);
}

.steps {
  counter-reset: step;
}
/* Four steps: 4 across on desktop, a balanced 2×2 below that (never 3 + 1). */
@media (max-width: 1080px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 560px) {
  .steps {
    grid-template-columns: 1fr;
  }
}
.steps .card::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 10px;
  font-weight: 800;
  color: var(--green);
  letter-spacing: 0.08em;
}

/* Contact */
.contact {
  background: var(--tint-green);
}
.lead-form {
  display: grid;
  gap: 18px;
  margin-top: 8px;
}
.row {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr 1fr;
}
.field {
  display: grid;
  gap: 6px;
}
.field label {
  font-weight: 600;
  font-size: 0.95rem;
}
input,
textarea {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
input:focus,
textarea:focus {
  outline: 3px solid color-mix(in srgb, var(--green) 30%, transparent);
  border-color: var(--green);
}
.form-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.form-status {
  margin: 0;
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 600;
}
.form-status.ok {
  background: color-mix(in srgb, var(--green) 15%, var(--surface));
  color: var(--green-strong);
}
.form-status.err {
  background: #fdecec;
  color: #9b2c2c;
}

/* Footer */
.site-footer {
  padding: 30px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
}
.footer-inner a {
  color: var(--muted);
}

@media (max-width: 640px) {
  .site-header nav {
    display: none;
  }
  .lang-switch {
    margin-left: auto;
  } /* nav (which normally pushes it right) is hidden */
  .row {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 64px 0 52px;
  }
}