/* ============================================================
   Design System: Lab Automation Consulting
   Fonts: Jost (display, matches the wordmark) + DM Sans (body)
   Theme: Olive drab + warm off-white + khaki accent
   ============================================================ */

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg:              #161a12;
  --bg-rgb:          22,26,18;
  --bg-mid:          #20261a;
  --bg-light:        #2c3324;
  --accent:          #c8b57a;
  --accent-rgb:      200,181,122;
  --accent-dark:     #aa9a68;
  --accent-muted:    #4b4831;
  --text-main:       #eeeadf;
  --text-muted:      #a9ae98;
  --text-muted-rgb:  169,174,152;
  --border:      rgba(255,255,255,0.08);
  --border-mid:  rgba(255,255,255,0.14);
  --card-bg:     rgba(255,255,255,0.04);
  --card-hover:  rgba(255,255,255,0.07);
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   18px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.3);
  --transition:  0.22s ease;
  --display:     'Jost', system-ui, sans-serif;
  --sans:        'DM Sans', system-ui, sans-serif;
  --max-w:       1100px;
}

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 400;
  line-height: 1.2;
}

.display-xl {
  font-size: clamp(2.8rem, 6vw, 5rem);
}

.display-lg {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 500;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 500;
}

.label {
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

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

/* ── Layout ─────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
}

.section--sm {
  padding: 4rem 0;
}

/* ── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(var(--bg-rgb), 0.92);
  backdrop-filter: blur(12px);
  border-color: var(--border);
}

/* backdrop-filter makes .nav a containing block for fixed descendants,
   which breaks the full-viewport mobile menu overlay below */
.nav:has(.nav__links.open) {
  backdrop-filter: none;
}

.nav__logo {
  font-family: var(--display);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-main);
}

.nav__mark {
  height: 1.75rem;
  width: auto;
  margin-right: 0.6rem;
  display: inline-block;
  vertical-align: middle;
}

.nav__logo span {
  color: var(--accent);
}

.nav__links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav__links a {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-main);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

.nav__cta {
  font-size: 0.85rem !important;
  font-weight: 500 !important;
  color: var(--accent) !important;
  border: 1px solid rgba(var(--accent-rgb), 0.35);
  padding: 0.45rem 1.1rem;
  border-radius: 999px;
  transition: background var(--transition), color var(--transition), border-color var(--transition) !important;
}

.nav__cta::after { display: none !important; }

.nav__cta:hover {
  background: var(--accent) !important;
  color: var(--bg) !important;
  border-color: var(--accent) !important;
}

/* ── Hamburger ──────────────────────────────────────────── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-main);
  transition: transform var(--transition), opacity var(--transition);
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
}

.btn--primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-mid);
}

.btn--outline:hover {
  border-color: rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.05);
}

/* ── Cards ──────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.card:hover {
  background: var(--card-hover);
  border-color: var(--border-mid);
  transform: translateY(-2px);
}

/* ── Tag / Pill ─────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: rgba(var(--accent-rgb), 0.12);
  color: var(--accent);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
}

.tag--gray {
  background: rgba(255,255,255,0.06);
  color: var(--text-muted);
  border-color: var(--border);
}

/* ── Divider ────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 3rem 0;
}

/* ── Section accent line ─────────────────────────────────── */
.accent-line {
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 1.5rem;
}

/* ── Page header ─────────────────────────────────────────── */
.page-header {
  padding: 10rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

/* ── Grid helpers ────────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ── Footer ─────────────────────────────────────────────── */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer__links a:hover { color: var(--text-main); }

.footer__privacy {
  flex-basis: 100%;
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.8;
  max-width: 640px;
}

/* ── Code copy button (js/code-copy.js) ─────────────────── */
div.code-block {
  position: relative;
  margin: 0 0 1.4rem;
}

div.code-block > pre {
  margin: 0;
  padding-right: 5.5rem;
}

.code-copy {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-mid);
  background: var(--bg-light);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.code-copy:hover,
.code-copy:focus-visible {
  color: var(--text-main);
  border-color: var(--accent);
  outline: none;
}

.code-copy.is-copied {
  color: var(--accent);
  border-color: rgba(var(--accent-rgb), 0.4);
  background: rgba(var(--accent-rgb), 0.1);
}

/* ── Fade-in animation ───────────────────────────────────── */
/* Content is only hidden for the entrance animation when JS is running
   (the "js" class is set inline in each page's <head>). If main.js never
   loads, the fallback animation reveals everything after 3s; main.js adds
   "fade-ready" to cancel the fallback once it's handling the fade-ins. */
.js .fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  animation: fade-up-fallback 0.6s ease 3s forwards;
}

.js.fade-ready .fade-up {
  animation: none;
}

.js .fade-up.visible {
  opacity: 1;
  transform: none;
}

@keyframes fade-up-fallback {
  to { opacity: 1; transform: none; }
}

/* ── Reduced motion ─────────────────────────────────────── */
/* Visitors who ask their device to reduce motion get no smooth scrolling,
   looping animations, or fade-ins; content simply appears. */
@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;
  }

  .js .fade-up {
    opacity: 1;
    transform: none;
  }
}

/* ── Keyboard focus ─────────────────────────────────────── */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ── Form ────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  letter-spacing: 0.03em;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--text-main);
  transition: border-color var(--transition), background var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(var(--text-muted-rgb), 0.85);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.04);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

/* ── Background grid texture ─────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  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: 60px 60px;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }

  .nav__links {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    z-index: 99;
  }

  .nav__links.open {
    display: flex;
  }

  .nav__links a {
    font-size: 1.4rem;
  }

  .nav__hamburger {
    display: flex;
    z-index: 101;
  }

  .section {
    padding: 4rem 0;
  }

  .container {
    padding: 0 1.25rem;
  }
}