:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-primary-light: #eef2ff;
  --color-dark: #0b1120;
  --color-dark-alt: #131c31;
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7fb;
  --color-text: #1a1d29;
  --color-text-muted: #5b6472;
  --color-border: #e6e8f0;
  --radius: 10px;
  --max-width: 1100px;
  --shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header / Nav ---------- */

.site-header {
  background: var(--color-dark);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-brand .logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: #cbd3e6;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  text-decoration: none;
}

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-dark-alt);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .nav-links.open {
    max-height: 400px;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 0.9rem 1.5rem;
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-links .nav-cta {
    margin: 0.75rem 1.5rem;
    display: inline-block;
    width: calc(100% - 3rem);
    text-align: center;
  }
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--color-dark) 0%, var(--color-dark-alt) 100%);
  color: #fff;
  padding: 5rem 0 6rem;
}

.hero .container {
  max-width: 780px;
  text-align: center;
}

.hero .eyebrow {
  color: #a5b4fc;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 1.25rem;
  line-height: 1.15;
}

.hero p {
  font-size: 1.15rem;
  color: #cbd3e6;
  margin: 0 auto 2rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Page header (non-home pages) ---------- */

.page-header {
  background: var(--color-dark);
  color: #fff;
  padding: 3.5rem 0;
  text-align: center;
}

.page-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
}

.page-header p {
  color: #cbd3e6;
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.btn-outline:hover {
  border-color: #fff;
  color: #fff;
}

.btn-outline-dark {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-outline-dark:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-small {
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
}

/* ---------- Sections ---------- */

section {
  padding: 4.5rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-heading {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-heading .eyebrow {
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.section-heading h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 0.75rem;
}

.section-heading p {
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- Cards / grid ---------- */

.grid {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.card .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
}

.card p {
  color: var(--color-text-muted);
  margin: 0 0 0.75rem;
}

.card .best-for {
  font-size: 0.85rem;
  color: var(--color-primary-dark);
  font-weight: 600;
}

.card.featured {
  border: 2px solid var(--color-primary);
  position: relative;
}

.card.featured .badge {
  position: absolute;
  top: -12px;
  right: 1.25rem;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

/* ---------- Callout / lab section ---------- */

.callout {
  background: var(--color-dark);
  color: #fff;
  border-radius: 16px;
  padding: 3rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

@media (min-width: 800px) {
  .callout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.callout .eyebrow {
  color: #a5b4fc;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}

.callout h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
}

.callout p {
  color: #cbd3e6;
  margin: 0 0 1rem;
}

.callout ul {
  color: #cbd3e6;
  padding-left: 1.2rem;
  margin: 0;
}

.callout li {
  margin-bottom: 0.5rem;
}

/* ---------- Contact widget ---------- */

.contact-widget {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.contact-widget .field {
  margin-bottom: 1.75rem;
}

.contact-widget .field:last-of-type {
  margin-bottom: 0;
}

.contact-widget label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.contact-widget canvas {
  margin: 0 auto 0.9rem;
}

.contact-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.copy-feedback {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-primary-dark);
  font-weight: 600;
  margin-left: 0.5rem;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.copy-feedback.show {
  opacity: 1;
}

.contact-note {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- Footer contact mini-widget ---------- */

.footer-contact {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-dark);
  color: #97a1b8;
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-bottom: 2rem;
}

.footer-grid h4 {
  color: #fff;
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li {
  margin-bottom: 0.6rem;
}

.footer-grid a {
  color: #97a1b8;
}

.footer-grid a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- Utility ---------- */

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

.mt-2 {
  margin-top: 2rem;
}