/* ============================================================
   AQVAERIS — Design System
   css/design-system.css
   ============================================================ */

/* ── Google Fonts ────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Inter:wght@300;400;500;600&display=swap');

/* ── Tokens ──────────────────────────────────────────────── */
:root {
  /* Palette */
  --forest:       #1A2B1E;
  --forest-deep:  #111B14;
  --moss:         #2E5436;
  --moss-mid:     #3E6B4A;
  --moss-lt:      #7EC48A;
  --moss-xlt:     #B4DFB9;
  --sage:         #F2F4F0;
  --sage-dk:      #E4E8E2;
  --white:        #FFFFFF;
  --amber:        #BA7517;
  --amber-lt:     #E8A84A;
  --text:         #1A2B1E;
  --text-body:    #2E3C30;
  --muted:        #6B7B6E;
  --muted-lt:     #9BAA9D;
  --divider:      rgba(46,84,54,0.15);

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Inter', system-ui, sans-serif;

  /* Type scale */
  --text-xs:   0.7rem;    /* 11px */
  --text-sm:   0.8rem;    /* 13px */
  --text-base: 0.9375rem; /* 15px */
  --text-md:   1.0625rem; /* 17px */
  --text-lg:   1.25rem;   /* 20px */
  --text-xl:   1.5rem;    /* 24px */
  --text-2xl:  2rem;      /* 32px */
  --text-3xl:  2.75rem;   /* 44px */
  --text-4xl:  3.75rem;   /* 60px */
  --text-5xl:  5rem;      /* 80px */

  /* Spacing */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-5:  1.25rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;
  --sp-32: 8rem;

  /* Layout */
  --max-width:      1280px;
  --content-width:  780px;
  --nav-h:          72px;

  /* Radii */
  --r-sm:   3px;
  --r-md:   6px;
  --r-lg:   12px;
  --r-full: 9999px;

  /* Transitions */
  --ease:       cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:   cubic-bezier(0, 0, 0.2, 1);
  --ease-spring:cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:   150ms;
  --dur-base:   250ms;
  --dur-slow:   400ms;
  --dur-xslow:  700ms;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.10), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.15), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl:  0 24px 64px rgba(0,0,0,0.18);
  --shadow-green: 0 8px 32px rgba(46,84,54,0.25);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 300;
  line-height: 1.65;
  color: var(--text-body);
  background: var(--sage);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; font: inherit; }
input, textarea, select { font: inherit; }

/* ── Typography ──────────────────────────────────────────── */
.t-display {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.t-display-italic {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  line-height: 1.15;
}

.t-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.t-body {
  font-size: var(--text-base);
  line-height: 1.7;
  font-weight: 300;
}

.t-body-md {
  font-size: var(--text-md);
  line-height: 1.65;
  font-weight: 300;
}

/* ── Layout ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-8);
}

@media (max-width: 768px) {
  .container { padding: 0 var(--sp-5); }
}

.content-width {
  max-width: var(--content-width);
  margin: 0 auto;
}

.section {
  padding: var(--sp-24) 0;
}

.section--lg {
  padding: var(--sp-32) 0;
}

/* ── Navigation ──────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-slow) var(--ease),
              box-shadow var(--dur-slow) var(--ease),
              backdrop-filter var(--dur-slow) var(--ease);
}

.nav.nav--transparent {
  background: transparent;
}

.nav.nav--scrolled {
  background: rgba(46, 84, 54, 0.96);
  backdrop-filter: blur(16px) saturate(1.2);
  box-shadow: 0 1px 0 rgba(126,196,138,0.15);
}

.nav.nav--light {
  background: rgba(242,244,240,0.96);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--divider);
}

.nav__inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--white);
  flex-shrink: 0;
  transition: color var(--dur-base) var(--ease);
}

/* SVG logo image — white on dark nav, dark on light nav */
.nav__logo-img {
  height: auto;
  width: auto;
  display: block;
  transition: filter var(--dur-base) var(--ease);
}


.nav--light .nav__logo { color: var(--forest); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 400;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.03em;
  transition: color var(--dur-base) var(--ease);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 1px;
  background: var(--moss-lt);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease);
}

.nav__link:hover { color: var(--white); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link--active { color: var(--white); }
.nav__link--active::after { transform: scaleX(1); }

.nav--light .nav__link { color: var(--muted); }
.nav--light .nav__link:hover { color: var(--text); }
.nav--light .nav__link--active { color: var(--moss); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.nav__lang {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--r-sm);
  padding: 0.3rem 0.6rem;
  cursor: pointer;
  transition: all var(--dur-base) var(--ease);
  background: none;
}

.nav__lang:hover {
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}

.nav--light .nav__lang {
  color: var(--muted);
  border-color: var(--divider);
}

/* Mobile nav */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--sp-2);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--white);
  transition: transform var(--dur-base) var(--ease),
              opacity var(--dur-base) var(--ease);
}

.nav--light .nav__hamburger span { background: var(--forest); }

.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--forest);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--dur-slow) var(--ease),
              transform var(--dur-slow) var(--ease);
}

.nav__mobile.open {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.nav__mobile .nav__link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: rgba(255,255,255,0.85);
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--r-sm);
  padding: 0.75rem 1.5rem;
  border: none;
  transition: all var(--dur-base) var(--ease);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.08);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.98); }

.btn--primary {
  background: var(--moss);
  color: var(--white);
  box-shadow: var(--shadow-green);
}

.btn--primary:hover { background: var(--moss-mid); }

.btn--outline {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.35);
}

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

.btn--outline-dark {
  background: transparent;
  color: var(--moss);
  border: 1px solid var(--moss);
}

.btn--outline-dark:hover {
  background: var(--moss);
  color: var(--white);
}

.btn--ghost {
  background: transparent;
  color: var(--muted);
  padding-left: 0;
  padding-right: 0;
}

.btn--ghost:hover { color: var(--text); }

.btn--lg {
  font-size: var(--text-base);
  padding: 0.9rem 2rem;
}

/* Arrow link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--moss);
  transition: gap var(--dur-base) var(--ease);
}

.arrow-link:hover { gap: var(--sp-3); }

.arrow-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--dur-base) var(--ease);
}

.arrow-link:hover svg { transform: translateX(3px); }

/* ── Tech Tags / Pills ───────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border-radius: var(--r-full);
  white-space: nowrap;
}

.tag--green {
  background: rgba(46,84,54,0.1);
  color: var(--moss);
  border: 1px solid rgba(46,84,54,0.2);
}

.tag--green-inv {
  background: var(--moss);
  color: var(--white);
}

.tag--dark {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.8);
  border: 1px solid rgba(255,255,255,0.12);
}

/* ── Stat Cards ──────────────────────────────────────────── */
.stat-card {
  padding: var(--sp-6);
  border-radius: var(--r-md);
  border: 1px solid var(--divider);
  background: var(--white);
}

.stat-card__value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 500;
  color: var(--moss);
  line-height: 1;
  margin-bottom: var(--sp-2);
}

.stat-card__label {
  font-size: var(--text-sm);
  color: var(--muted);
  line-height: 1.4;
}

/* ── Divider ─────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--divider);
  border: none;
}

.divider--green {
  background: linear-gradient(90deg, transparent, var(--moss-lt), transparent);
  height: 1px;
  border: none;
}

/* ── Callout / Amber hint block ──────────────────────────── */
.callout {
  border-left: 3px solid var(--amber);
  background: rgba(186,117,23,0.06);
  padding: var(--sp-5) var(--sp-6);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.callout__label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--sp-2);
}

.callout p {
  font-size: var(--text-sm);
  color: var(--text-body);
  line-height: 1.65;
}

/* ── Pathogen Panel ──────────────────────────────────────── */
.pathogen-panel {
  background: var(--forest);
  border-radius: var(--r-lg);
  padding: var(--sp-8) var(--sp-10);
  color: var(--white);
}

.pathogen-panel__title {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--moss-lt);
  margin-bottom: var(--sp-5);
}

.pathogen-panel__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}

.pathogen-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.85);
}

.pathogen-item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss-lt);
  flex-shrink: 0;
}

.pathogen-panel__footnote {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
  line-height: 1.6;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--sp-4);
}

/* ── Section labels ──────────────────────────────────────── */
.section-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: var(--sp-4);
}

.section-label--inv { color: var(--moss-lt); }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--forest-deep);
  color: rgba(255,255,255,0.6);
  padding: var(--sp-16) 0 var(--sp-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--sp-10);
  margin-bottom: var(--sp-12);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--white);
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-3);
}

.footer__tagline {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss-lt);
  margin-bottom: var(--sp-5);
}

.footer__desc {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: rgba(255,255,255,0.4);
  max-width: 280px;
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: var(--sp-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.45);
  transition: color var(--dur-base) var(--ease);
}

.footer__link:hover { color: rgba(255,255,255,0.8); }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.footer__legal {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.25);
}

.footer__legal-links {
  display: flex;
  gap: var(--sp-6);
}

.footer__legal-links a {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.25);
  transition: color var(--dur-base) var(--ease);
}

.footer__legal-links a:hover { color: rgba(255,255,255,0.5); }

@media (max-width: 900px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }
  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ── Scroll reveal animations ────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-xslow) var(--ease-out),
              transform var(--dur-xslow) var(--ease-out);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal--left {
  transform: translateX(-24px);
}

.reveal--left.revealed {
  transform: translateX(0);
}

.reveal--right {
  transform: translateX(24px);
}

.reveal--right.revealed {
  transform: translateX(0);
}

/* Stagger utility — add delay via CSS custom property */
.reveal[data-delay="1"] { transition-delay: 80ms; }
.reveal[data-delay="2"] { transition-delay: 160ms; }
.reveal[data-delay="3"] { transition-delay: 240ms; }
.reveal[data-delay="4"] { transition-delay: 320ms; }
.reveal[data-delay="5"] { transition-delay: 400ms; }

/* ── Utility classes ─────────────────────────────────────── */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* Page body offset for fixed nav */
.page-body {
  padding-top: var(--nav-h);
}