/* ============================================================
   TRAK TFRC — Shared Stylesheet
   Dark theme, Space Grotesk + DM Sans
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300;1,9..40,400&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --nav-height: 72px;

  /* Backgrounds */
  --dark:   #0c1a0f;
  --dark-2: #111f14;
  --dark-3: #172519;

  /* Accents */
  --green:        #2f7d40;
  --green-bright: #4caf62;
  --amber:        #d4843b;

  /* Text on dark */
  --text-dark:       #e2ddd3;
  --text-dark-muted: #7a9a82;

  /* Light sections */
  --light:           #f4f1ea;
  --light-2:         #ede9e0;
  --light-3:         #d8d3c8;
  --text-light:      #1a2e1d;
  --text-light-muted:#5a7060;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }

body {
  font-family: 'DM Sans', sans-serif;
  font-weight: 400;
  color: var(--text-dark);
  background: var(--dark);
  line-height: 1.65;
  font-size: 16px;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 500;
  line-height: 1.2;
}

/* ── Navigation ────────────────────────────────────────────── */
#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 6vw, 80px);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.35s, border-color 0.35s;
}

#main-nav.scrolled {
  background: rgba(12, 26, 15, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-dark);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(226, 221, 211, 0.75);
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-dark);
}

.nav-cta {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-bright);
  border: 1px solid rgba(76, 175, 98, 0.4);
  border-radius: 3px;
  padding: 8px 18px;
  transition: background 0.2s, border-color 0.2s;
}

.nav-cta:hover {
  background: rgba(76, 175, 98, 0.12);
  border-color: var(--green-bright);
}

/* ── Layout ────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 80px);
}

.section {
  padding: clamp(64px, 8vw, 100px) clamp(24px, 8vw, 120px);
}

.section-dark {
  padding: clamp(64px, 8vw, 100px) clamp(24px, 8vw, 120px);
  background: var(--dark);
}

.section-dark-2 {
  padding: clamp(64px, 8vw, 100px) clamp(24px, 8vw, 120px);
  background: var(--dark-2);
}

/* ── Page hero (inner pages) ───────────────────────────────── */
.page-hero {
  padding: calc(var(--nav-height) + 80px) clamp(24px, 8vw, 120px) 80px;
  background: var(--dark);
}

/* ── Typography helpers ────────────────────────────────────── */
.label {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--green-bright);
}

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

.rule {
  width: 32px;
  height: 2px;
  background: var(--green-bright);
  margin: 14px 0 28px;
  border-radius: 1px;
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 13px 26px;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover { background: var(--green-bright); }

.btn-outline {
  background: transparent;
  color: var(--text-dark);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline:hover { border-color: rgba(255, 255, 255, 0.5); }

/* ── Scroll-reveal ─────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ── Footer ────────────────────────────────────────────────── */
footer {
  background: var(--dark-2);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: clamp(48px, 6vw, 80px) clamp(24px, 8vw, 120px) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--text-dark-muted);
  max-width: 280px;
  line-height: 1.7;
  margin-top: 12px;
}

footer h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dark-muted);
  margin-bottom: 16px;
}

footer ul { list-style: none; }

footer ul li { margin-bottom: 10px; }

footer ul li a {
  font-size: 0.88rem;
  color: rgba(226, 221, 211, 0.6);
  transition: color 0.2s;
}

footer ul li a:hover { color: var(--text-dark); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  color: var(--text-dark-muted);
}

/* ── Hamburger button ──────────────────────────────────────── */
.nav-hamburger {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 3px;
  padding: 7px 9px;
  cursor: pointer;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}
.nav-hamburger span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-dark);
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.25s;
}
#main-nav.nav-open .nav-hamburger span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
#main-nav.nav-open .nav-hamburger span:nth-child(2) { opacity: 0; }
#main-nav.nav-open .nav-hamburger span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* ── Responsive grid helpers ───────────────────────────────── */
.hw-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.cta-band-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 960px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .nav-links { gap: 1.25rem; }
  .hw-cards-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  #main-nav { padding: 0 16px; }
  .nav-hamburger { display: flex; }
  .nav-cta { display: none; }

  /* Mobile nav: slide down from top */
  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(10,22,13,0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: 8px 0 16px;
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s ease, opacity 0.28s ease;
  }
  #main-nav.nav-open .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .nav-links li { border-bottom: 1px solid rgba(255,255,255,0.05); }
  .nav-links a { display: block; padding: 13px 20px; font-size: 0.92rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .section, .section-dark, .section-dark-2 { padding: 52px 0; }
  .page-hero { padding: calc(var(--nav-height) + 40px) 0 48px; }
  footer { padding: 48px 20px 0; }
  .hw-cards-grid { grid-template-columns: 1fr; }
  .cta-band-inner { grid-template-columns: 1fr; gap: 28px; }

  /* On mobile, show the mesh diagram above the text */
  .intro-visual { order: -1; }
  .intro-grid { gap: 32px; }
}