/* ================================================================
   AERO-CLEAN Solutions — Design System Global
   Palette: Navy #0A2540 · Vert #00BB77 · Accent #00B48A
   Typography: Syne (display) + Inter (body)
================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,600;1,600&family=Inter:wght@300;400;500;600&display=swap');

/* ── TOKENS ── */
:root {
  --navy:       #0A2540;
  --navy-dark:  #061828;
  --navy-mid:   #0d3358;
  --green:      #00BB77;
  --green-dark: #009960;
  --green-mid:  #00B48A;
  --green-pale: #e6f9f1;
  --white:      #ffffff;
  --off-white:  #F8F9FA;
  --slate:      #4a6275;
  --muted:      #8fa3b1;
  --border:     #dde6ec;
  --error:      #e05252;

  /* Gradients signatures */
  --grad-hero:    linear-gradient(140deg, #0A2540 0%, #0d3762 55%, #004d33 100%);
  --grad-section: linear-gradient(135deg, #0A2540 0%, #003322 100%);
  --grad-btn:     linear-gradient(135deg, #00BB77 0%, #00B48A 100%);
  --grad-card:    linear-gradient(135deg, rgba(0,187,119,.08) 0%, rgba(0,180,138,.04) 100%);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(10,37,64,.07);
  --shadow-md: 0 8px 32px rgba(10,37,64,.12);
  --shadow-lg: 0 24px 64px rgba(10,37,64,.18);
  --shadow-green: 0 8px 28px rgba(0,187,119,.28);

  /* Radii */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 24px;
  --r-xl: 40px;

  /* Fonts */
  --font-display: 'Montserrat', sans-serif;
  --font-body:    'Inter', sans-serif;

  /* Transitions */
  --ease: cubic-bezier(.4,0,.2,1);
  --t:    .22s;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--navy);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ── LAYOUT ── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 28px;
}
.container--narrow { max-width: 780px; }
.container--wide   { max-width: 1320px; }

/* ── TYPE SCALE ── */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -.03em;
}
.display-lg {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.02em;
}
.display-md {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.015em;
}
.display-sm {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}
.body-lg  { font-size: 1.1rem;  line-height: 1.7; }
.body-md  { font-size: 1rem;    line-height: 1.7; }
.body-sm  { font-size: .875rem; line-height: 1.65; }
.body-xs  { font-size: .78rem;  line-height: 1.55; }
.label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.text-muted  { color: var(--muted); }
.text-slate  { color: var(--slate); }
.text-green  { color: var(--green); }
.text-white  { color: var(--white); }
.text-navy   { color: var(--navy); }

/* ── EYEBROW LABELS ── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green);
  background: var(--green-pale);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 18px;
}
.eyebrow--dark {
  background: rgba(0,187,119,.18);
  color: #5fffc0;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--green);
  border-radius: 50%;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .92rem;
  padding: 14px 28px;
  border-radius: var(--r-sm);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), background var(--t) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

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

.btn--outline-white {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,.35);
}
.btn--outline-white:hover { border-color: rgba(255,255,255,.75); background: rgba(255,255,255,.08); }

.btn--outline-navy {
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--border);
}
.btn--outline-navy:hover { border-color: var(--green); color: var(--green); }

.btn--lg { padding: 17px 36px; font-size: 1rem; }
.btn--sm { padding: 9px 18px; font-size: .82rem; }

.btn-icon {
  width: 18px; height: 18px;
  flex-shrink: 0;
}

/* ── CARDS ── */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius, var(--r-md));
  padding: var(--p, 32px);
  transition: box-shadow var(--t) var(--ease), transform var(--t) var(--ease), border-color var(--t) var(--ease);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: rgba(0,187,119,.35);
}
.card--highlight {
  background: var(--grad-card);
  border-color: rgba(0,187,119,.2);
}

/* ── SECTION SPACING ── */
.section { padding: 96px 0; }
.section--sm { padding: 64px 0; }
.section--lg { padding: 128px 0; }
.section--dark {
  background: var(--grad-section);
  color: var(--white);
}
.section--light { background: var(--off-white); }

/* ── DIVIDERS ── */
.divider {
  width: 48px; height: 3px;
  background: var(--grad-btn);
  border-radius: 2px;
  margin: 16px 0 24px;
}

/* ── BADGE ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
}
.badge--green { background: var(--green-pale); color: var(--green-dark); }
.badge--navy  { background: rgba(10,37,64,.08); color: var(--navy); }

/* ── FORMS ── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: .02em;
}
.form-control {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: .9rem;
  color: var(--navy);
  background: var(--white);
  outline: none;
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
  -webkit-appearance: none;
}
.form-control:focus {
  border-color: var(--green-mid);
  box-shadow: 0 0 0 3px rgba(0,180,138,.15);
}
.form-control::placeholder { color: var(--muted); }
textarea.form-control { resize: vertical; min-height: 110px; }

/* ── HEADER ── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 72px;
  background: rgba(10,37,64,.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,.07);
  transition: box-shadow var(--t) var(--ease), opacity .6s ease-in-out;
}
.site-header.scrolled { box-shadow: 0 4px 32px rgba(10,37,64,.4); }
.site-header.nav-hidden { opacity: 0; pointer-events: none; }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -.01em;
}
.logo-mark {
  width: 36px; height: 36px;
  background: var(--grad-btn);
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.logo-mark svg { width: 24px; height: 24px; }
.logo-name span { color: var(--green); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-links .btn { margin-left: 20px; }
.nav-link {
  font-size: .85rem;
  font-weight: 500;
  color: rgba(255,255,255,.65);
  padding: 8px 14px;
  border-radius: var(--r-sm);
  transition: color var(--t), background var(--t);
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--white);
  background: rgba(255,255,255,.08);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 4px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 2px;
  background: var(--green);
  border-radius: 2px;
}

/* Dropdown */
.nav-item {
  position: relative;
  align-self: stretch;
  display: flex;
  align-items: center;
}
.nav-item > .nav-link {
  height: 100%;
  display: flex;
  align-items: center;
}
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 200px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  padding: 12px 8px 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease);
}
.nav-item:hover .nav-dropdown {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 9px 14px;
  font-size: .85rem;
  color: var(--slate);
  border-radius: var(--r-sm);
  transition: background var(--t), color var(--t);
}
.nav-dropdown a:hover { background: var(--green-pale); color: var(--green-dark); }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--t) var(--ease);
}
.nav-burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 72px; left: 0; right: 0; bottom: 0;
  background: var(--navy-dark);
  z-index: 999;
  padding: 24px 28px;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 1.1rem;
  font-weight: 600;
  color: rgba(255,255,255,.75);
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,.07);
  transition: color var(--t);
}
.mobile-nav a:hover { color: var(--green); }

/* ── FOOTER ── */
.site-footer {
  background: var(--navy-dark);
  padding: 72px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand p {
  font-size: .84rem;
  color: rgba(255,255,255,.45);
  line-height: 1.75;
  margin-top: 14px;
  max-width: 280px;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.3);
  margin-bottom: 18px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: .84rem;
  color: rgba(255,255,255,.5);
  transition: color var(--t);
}
.footer-col ul li a:hover { color: var(--green); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: .78rem; color: rgba(255,255,255,.25); }
.footer-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-badge-item {
  font-size: .72rem;
  color: rgba(255,255,255,.35);
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  padding: 4px 10px;
  border-radius: 100px;
}

/* ── HERO SHARED ── */
.page-hero {
  min-height: 52vh;
  background: var(--grad-hero);
  display: flex;
  align-items: flex-end;
  padding: 120px 0 64px;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 56px;
  background: linear-gradient(to top, var(--white) 0%, transparent 100%);
}
.page-hero__content { position: relative; z-index: 1; }
.page-hero .eyebrow { margin-bottom: 16px; }
.page-hero h1 { color: var(--white); margin-bottom: 14px; }
.page-hero p  { color: rgba(255,255,255,.65); max-width: 580px; }

/* ── BREADCRUMB ── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  color: rgba(255,255,255,.4);
  margin-bottom: 20px;
}
.breadcrumb a { color: rgba(255,255,255,.55); transition: color var(--t); }
.breadcrumb a:hover { color: var(--green); }
.breadcrumb-sep { opacity: .4; }

/* ── STAT BLOCKS ── */
.stat-block { text-align: center; }
.stat-num {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--green);
  margin-bottom: 6px;
}
.stat-label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 4px;
}
.stat-desc { font-size: .78rem; color: var(--muted); }

/* ── FAQ ACCORDION ── */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-btn {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 16px;
}
.faq-btn-text {
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 600;
  color: var(--navy);
}
.faq-chevron {
  width: 30px; height: 30px;
  flex-shrink: 0;
  background: var(--green-pale);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--t), transform var(--t);
  color: var(--green);
}
.faq-item.open .faq-chevron { background: var(--green); color: var(--white); transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .38s var(--ease); }
.faq-answer-inner { padding-bottom: 22px; font-size: .9rem; color: var(--slate); line-height: 1.8; }

/* ── SCROLL REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* ── UTILITY ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.gap-8 { gap: 32px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mt-12 { margin-top: 48px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.text-center { text-align: center; }
.hidden { display: none !important; }
.w-full { width: 100%; }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .section { padding: 64px 0; }
  .section--lg { padding: 80px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .container { padding: 0 20px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}