/* ============================================================
   Fresh Air Solutions — Aurora design system
   ============================================================ */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 0.8rem + 6.5vw, 7rem);

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

  /* Radius */
  --radius-sm: 0.5rem; --radius-md: 0.75rem; --radius-lg: 1.25rem; --radius-xl: 2rem; --radius-full: 9999px;

  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Aurora gradient stops — tuned to the Fresh Air Solutions logo (green → blue) */
  --aurora-mint: #7BC142;
  --aurora-cyan: #2BAFE2;
  --aurora-lav: #1E7FB8;
  --aurora: linear-gradient(105deg, #7BC142 0%, #34BDE6 55%, #1E7FB8 100%);
  --aurora-soft: linear-gradient(105deg, rgba(123,193,66,0.16) 0%, rgba(52,189,230,0.18) 55%, rgba(30,127,184,0.16) 100%);

  /* Content widths */
  --content-narrow: 680px;
  --content-default: 1040px;
  --content-wide: 1240px;

  --font-display: "General Sans", "Helvetica Neue", Arial, sans-serif;
  --font-body: "General Sans", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
}

/* Light mode */
:root, [data-theme="light"] {
  --color-bg: #F6F9FA;
  --color-surface: #FFFFFF;
  --color-surface-2: #FBFDFE;
  --color-surface-offset: #EEF4F6;
  --color-border: #DEE8EB;
  --color-divider: #E7EEF0;

  --color-text: #0B1B22;
  --color-text-muted: #5C7079;
  --color-text-faint: #93A4AC;
  --color-text-inverse: #F6F9FA;

  --color-primary: #1E7FB8;
  --color-primary-hover: #155E89;

  --shadow-sm: 0 1px 2px rgba(11,27,34,0.06);
  --shadow-md: 0 8px 24px rgba(11,27,34,0.08);
  --shadow-lg: 0 24px 60px rgba(11,27,34,0.12);
  --shadow-glow: 0 18px 50px rgba(52,189,230,0.18);

  --hero-overlay: linear-gradient(100deg, rgba(246,249,250,0.96) 0%, rgba(246,249,250,0.78) 38%, rgba(246,249,250,0.18) 70%, rgba(246,249,250,0) 100%);
}

/* Dark mode */
[data-theme="dark"] {
  --color-bg: #06121A;
  --color-surface: #0D1F29;
  --color-surface-2: #102530;
  --color-surface-offset: #0A1B24;
  --color-border: #1C3540;
  --color-divider: #162C36;

  --color-text: #E6F1F3;
  --color-text-muted: #93AEB7;
  --color-text-faint: #5C7079;
  --color-text-inverse: #06121A;

  --color-primary: #4FB7E8;
  --color-primary-hover: #7BCFF1;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.45);
  --shadow-lg: 0 24px 60px rgba(0,0,0,0.6);
  --shadow-glow: 0 18px 60px rgba(52,189,230,0.28);

  --hero-overlay: linear-gradient(100deg, rgba(6,18,26,0.96) 0%, rgba(6,18,26,0.82) 40%, rgba(6,18,26,0.30) 72%, rgba(6,18,26,0.05) 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #06121A; --color-surface: #0D1F29; --color-surface-2: #102530;
    --color-surface-offset: #0A1B24; --color-border: #1C3540; --color-divider: #162C36;
    --color-text: #E6F1F3; --color-text-muted: #93AEB7; --color-text-faint: #5C7079;
    --color-text-inverse: #06121A; --color-primary: #4FB7E8; --color-primary-hover: #7BCFF1;
    --hero-overlay: linear-gradient(100deg, rgba(6,18,26,0.96) 0%, rgba(6,18,26,0.82) 40%, rgba(6,18,26,0.30) 72%, rgba(6,18,26,0.05) 100%);
  }
}

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

html {
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; scroll-behavior: smooth;
  scroll-padding-top: 90px; font-feature-settings: "tnum" 0;
}

body {
  min-height: 100dvh; line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text); background-color: var(--color-bg);
  transition: background-color 400ms ease, color 400ms ease;
  overflow-x: hidden;
}

img, picture, svg, canvas { display: block; max-width: 100%; height: auto; }
ul[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

h1,h2,h3,h4 { text-wrap: balance; line-height: 1.08; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; }
p { text-wrap: pretty; }

a { color: inherit; text-decoration: none; }

::selection { background: rgba(52,189,230,0.28); color: var(--color-text); }

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

.tnum { font-variant-numeric: tabular-nums; }

a, button, [role="button"], input, textarea {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

.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; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--content-wide); margin-inline: auto; padding-inline: clamp(var(--space-5), 5vw, var(--space-16)); }
.section { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-primary);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; border-radius: 2px; background: var(--aurora); }
.section-title { font-size: var(--text-2xl); margin-top: var(--space-4); max-width: 18ch; }
.lede { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 56ch; margin-top: var(--space-5); line-height: 1.5; }

.aurora-text {
  background: var(--aurora); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.serif-accent { font-family: var(--font-serif); font-style: italic; font-weight: 400; letter-spacing: -0.01em; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: 600; padding: 0.85rem 1.5rem; border-radius: var(--radius-full);
  line-height: 1; white-space: nowrap; }

.btn-primary { color: #04181B; position: relative; isolation: isolate; }
.btn-primary::before { content: ""; position: absolute; inset: 0; border-radius: inherit; background: var(--aurora); z-index: -1; transition: filter var(--transition-interactive), transform var(--transition-interactive); }
.btn-primary:hover { box-shadow: var(--shadow-glow); }
.btn-primary:hover::before { filter: brightness(1.08) saturate(1.1); }

.btn-ghost { color: var(--color-text); border: 1.5px solid var(--color-border); background: var(--color-surface); }
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-1px); }

/* gradient-border pill (header CTA) */
.btn-aurora-border {
  position: relative; color: var(--color-text); background: var(--color-surface);
  font-weight: 600; padding: 0.7rem 1.3rem;
}
.btn-aurora-border::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1.5px;
  background: var(--aurora);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  transition: opacity var(--transition-interactive);
}
.btn-aurora-border:hover { color: var(--color-primary); box-shadow: var(--shadow-glow); transform: translateY(-1px); }

/* ---------- Header ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 300ms ease, box-shadow 300ms ease, border-color 300ms ease;
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(16px) saturate(1.4); -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom-color: var(--color-divider); box-shadow: var(--shadow-sm);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--color-text); }
.logo-img { height: 44px; width: auto; display: block; }
.logo-dark { display: none; }
[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark  { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .logo-light { display: none; }
  :root:not([data-theme]) .logo-dark  { display: block; }
}
@media (max-width: 620px) { .logo-img { height: 38px; } }

/* Approach list (About section) */
.approach-list { margin-top: var(--space-6); display: grid; gap: var(--space-3); list-style: none; padding: 0; }
.approach-list li { display: flex; align-items: flex-start; gap: var(--space-3); font-size: var(--text-base); color: var(--color-text); line-height: 1.5; }
.approach-dot { flex: none; width: 10px; height: 10px; border-radius: var(--radius-full); margin-top: 0.55rem; background: var(--aurora); box-shadow: 0 0 0 4px rgba(52,189,230,0.12); }

.nav { display: flex; align-items: center; gap: var(--space-6); }
.nav-links { display: flex; align-items: center; gap: var(--space-6); }
.nav-links a { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); position: relative; }
.nav-links a:hover { color: var(--color-text); }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -5px; height: 2px; width: 0; background: var(--aurora); border-radius: 2px; transition: width var(--transition-interactive); }
.nav-links a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: var(--radius-full); color: var(--color-text-muted); border: 1px solid var(--color-border); background: var(--color-surface); }
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }
.menu-btn { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; color: var(--color-text); border: 1px solid var(--color-border); border-radius: var(--radius-full); }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .header-cta-text { display: none; }
  .menu-btn { display: inline-flex; }
}
@media (max-width: 620px) {
  .header .btn-aurora-border { display: none; }
}

.mobile-menu[hidden] { display: none; }
.mobile-menu {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-4) clamp(var(--space-5), 5vw, var(--space-16)) var(--space-6);
  background: color-mix(in srgb, var(--color-bg) 95%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider); box-shadow: var(--shadow-md);
}
.mobile-menu a:not(.btn) { font-size: var(--text-base); font-weight: 500; color: var(--color-text); padding: var(--space-2) 0; }
.mobile-menu a:not(.btn):hover { color: var(--color-primary); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; overflow: hidden; padding-top: 72px; }
.hero-bg { position: absolute; inset: 0; z-index: -3; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center right; }
.hero-overlay { position: absolute; inset: 0; z-index: -2; background: var(--hero-overlay); }
.hero-current { position: absolute; inset: 0; z-index: -1; opacity: 0.9; pointer-events: none; }

.hero-content { max-width: 720px; padding-block: var(--space-16); }
.hero h1 { font-size: var(--text-hero); line-height: 0.98; letter-spacing: -0.03em; }
.hero h1 .serif-accent { font-size: 1.05em; }
.hero-sub { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 50ch; margin-top: var(--space-6); line-height: 1.5; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

.trust-strip { display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-6); margin-top: var(--space-12); padding-top: var(--space-6); border-top: 1px solid var(--color-divider); }
.trust-item { display: inline-flex; align-items: center; gap: 0.5rem; font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 500; }
.trust-item svg { width: 16px; height: 16px; color: var(--color-primary); flex: none; }

/* ---------- Problem ---------- */
.problem { background: var(--color-surface); position: relative; overflow: hidden; }
.problem-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(var(--space-8), 6vw, var(--space-20)); align-items: center; }
.pullquote { font-family: var(--font-serif); font-style: italic; font-size: var(--text-2xl); line-height: 1.15; letter-spacing: -0.01em; }
.pullquote .aurora-text { font-style: italic; }
.stat-cards { display: grid; gap: var(--space-4); }
.stat-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-6); position: relative; overflow: hidden; }
.stat-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--aurora); }
.stat-card .big { font-size: var(--text-xl); font-weight: 600; font-family: var(--font-display); letter-spacing: -0.02em; }
.stat-card p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); }
.cite { font-size: var(--text-xs); color: var(--color-text-faint); margin-top: var(--space-6); }
.cite a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- ERV diagram ---------- */
.erv { background: var(--color-bg); }
.erv-head { text-align: center; max-width: 700px; margin-inline: auto; margin-bottom: var(--space-12); }
.erv-head .lede { margin-inline: auto; }
.diagram-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: clamp(var(--space-5), 4vw, var(--space-12)); box-shadow: var(--shadow-md); }
.diagram-svg { width: 100%; height: auto; }
.erv-callouts { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); margin-top: var(--space-10); }
.erv-callout { display: flex; gap: var(--space-3); }
.erv-num { flex: none; width: 30px; height: 30px; border-radius: var(--radius-full); display: grid; place-items: center; font-size: var(--text-sm); font-weight: 700; color: #04181B; background: var(--aurora); font-variant-numeric: tabular-nums; }
.erv-callout h4 { font-size: var(--text-base); font-weight: 600; }
.erv-callout p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: 2px; }

/* ---------- Services ---------- */
.services { background: var(--color-surface); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-top: var(--space-12); }
.svc-card {
  background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: var(--space-8); display: flex; flex-direction: column; gap: var(--space-3);
  position: relative; overflow: hidden;
}
.svc-card::after { content: ""; position: absolute; inset: 0; border-radius: inherit; opacity: 0; background: var(--aurora-soft); transition: opacity var(--transition-interactive); pointer-events: none; }
.svc-card:hover { transform: translateY(-4px); border-color: transparent; box-shadow: var(--shadow-glow); }
.svc-card:hover::after { opacity: 1; }
.svc-icon { width: 48px; height: 48px; border-radius: var(--radius-md); display: grid; place-items: center; background: var(--color-surface); border: 1px solid var(--color-border); color: var(--color-primary); position: relative; z-index: 1; }
.svc-icon svg { width: 26px; height: 26px; }
.svc-card h3 { font-size: var(--text-lg); position: relative; z-index: 1; }
.svc-card p { font-size: var(--text-sm); color: var(--color-text-muted); position: relative; z-index: 1; flex: 1; }
.svc-link { font-size: var(--text-sm); font-weight: 600; color: var(--color-primary); display: inline-flex; align-items: center; gap: 0.35rem; position: relative; z-index: 1; }
.svc-link svg { width: 15px; height: 15px; transition: transform var(--transition-interactive); }
.svc-card:hover .svc-link svg { transform: translateX(4px); }

/* ---------- Process ---------- */
.process { background: var(--color-bg); }
.timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); margin-top: var(--space-16); position: relative; }
.timeline::before { content: ""; position: absolute; top: 19px; left: 8%; right: 8%; height: 2px; background: var(--aurora); opacity: 0.5; border-radius: 2px; }
.step { position: relative; }
.step-dot { width: 40px; height: 40px; border-radius: var(--radius-full); background: var(--color-surface); border: 2px solid var(--color-primary); display: grid; place-items: center; font-weight: 700; color: var(--color-primary); font-variant-numeric: tabular-nums; position: relative; z-index: 1; }
.step h3 { font-size: var(--text-lg); margin-top: var(--space-5); }
.step p { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); }
.step .step-time { font-size: var(--text-xs); font-weight: 600; color: var(--color-primary); text-transform: uppercase; letter-spacing: 0.08em; margin-top: var(--space-2); display: block; }

/* ---------- Stats band ---------- */
.stats-band { background: var(--color-surface); position: relative; overflow: hidden; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-8); text-align: center; }
.stat .num { font-size: var(--text-3xl); font-weight: 600; font-family: var(--font-display); letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums; }
.stat .label { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-3); }

/* ---------- Testimonials ---------- */
.testimonials { background: var(--color-bg); }
.tgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-top: var(--space-12); }
.tcard { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-8); display: flex; flex-direction: column; gap: var(--space-5); }
.stars { display: flex; gap: 2px; color: var(--aurora-cyan); }
.stars svg { width: 18px; height: 18px; }
.tcard blockquote { font-size: var(--text-base); line-height: 1.5; flex: 1; }
.tcard .who { font-size: var(--text-sm); font-weight: 600; }
.tcard .who span { display: block; color: var(--color-text-muted); font-weight: 400; font-size: var(--text-xs); margin-top: 2px; }

/* ---------- FAQ ---------- */
.faq { background: var(--color-surface); }
.faq-wrap { max-width: 800px; margin-inline: auto; }
.faq-list { margin-top: var(--space-10); border-top: 1px solid var(--color-divider); }
.faq-item { border-bottom: 1px solid var(--color-divider); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding: var(--space-5) 0; text-align: left; font-size: var(--text-lg); font-weight: 600; font-family: var(--font-display); color: var(--color-text); }
.faq-q .icon { flex: none; width: 28px; height: 28px; border-radius: var(--radius-full); display: grid; place-items: center; border: 1px solid var(--color-border); color: var(--color-primary); transition: transform var(--transition-interactive), background var(--transition-interactive); }
.faq-q[aria-expanded="true"] .icon { transform: rotate(45deg); background: var(--aurora); color: #04181B; border-color: transparent; }
.faq-a { overflow: hidden; max-height: 0; transition: max-height 360ms cubic-bezier(0.16,1,0.3,1); }
.faq-a-inner { padding-bottom: var(--space-5); color: var(--color-text-muted); font-size: var(--text-base); max-width: 64ch; }

/* ---------- Final CTA ---------- */
.final-cta { padding-block: 0; }
.cta-panel { position: relative; overflow: hidden; border-radius: clamp(var(--radius-lg), 4vw, var(--radius-xl)); padding: clamp(var(--space-12), 9vw, var(--space-32)) clamp(var(--space-6), 6vw, var(--space-24)); text-align: center; isolation: isolate; }
.cta-panel::before { content: ""; position: absolute; inset: 0; z-index: -2; background: var(--aurora); }
.cta-panel::after { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(120% 140% at 80% 0%, rgba(255,255,255,0.35), transparent 55%); }
.cta-panel h2 { font-size: var(--text-2xl); color: #04181B; max-width: 16ch; margin-inline: auto; }
.cta-panel p { color: rgba(4,24,27,0.78); font-size: var(--text-lg); max-width: 50ch; margin: var(--space-5) auto 0; line-height: 1.45; }
.cta-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; align-items: center; margin-top: var(--space-8); }
.cta-phone { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: var(--text-lg); color: #04181B; }
.cta-phone svg { width: 20px; height: 20px; }
.btn-on-aurora { background: #04181B; color: #EAFBF6; }
.btn-on-aurora:hover { background: #0B2A2E; box-shadow: 0 14px 40px rgba(4,24,27,0.35); transform: translateY(-1px); }

/* ---------- Footer ---------- */
.footer { background: var(--color-bg); border-top: 1px solid var(--color-divider); padding-block: var(--space-16) var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.1fr 1.2fr; gap: var(--space-8); }
@media (max-width: 960px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-areas .towns-list { grid-template-columns: 1fr 1fr; gap: var(--space-2) var(--space-4); }
.footer-blurb { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-4); max-width: 34ch; }
.footer h4 { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-text-faint); font-family: var(--font-body); font-weight: 600; margin-bottom: var(--space-4); }
.footer ul { list-style: none; display: grid; gap: var(--space-3); }
.footer ul a, .footer ul li { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer ul a:hover { color: var(--color-primary); }
.footer-social { display: flex; gap: var(--space-3); margin-top: var(--space-2); }
.footer-social a { width: 38px; height: 38px; border-radius: var(--radius-full); border: 1px solid var(--color-border); display: grid; place-items: center; color: var(--color-text-muted); }
.footer-social a:hover { color: var(--color-primary); border-color: var(--color-primary); }
.footer-social svg { width: 18px; height: 18px; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: space-between; align-items: center; margin-top: var(--space-16); padding-top: var(--space-6); border-top: 1px solid var(--color-divider); font-size: var(--text-xs); color: var(--color-text-faint); }
.footer-bottom a { color: var(--color-text-faint); }
.footer-bottom a:hover { color: var(--color-primary); }

/* ---------- Air current animation ---------- */
.air-current path { animation: drift 14s ease-in-out infinite; }
.air-current path:nth-child(2) { animation-duration: 18s; animation-delay: -3s; }
.air-current path:nth-child(3) { animation-duration: 22s; animation-delay: -7s; }
@keyframes drift {
  0%, 100% { transform: translate3d(0,0,0); }
  50% { transform: translate3d(-2.5%, 1.5%, 0); }
}

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 600ms cubic-bezier(0.16,1,0.3,1), transform 600ms cubic-bezier(0.16,1,0.3,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 80ms; } .reveal-d2 { transition-delay: 160ms; }
.reveal-d3 { transition-delay: 240ms; } .reveal-d4 { transition-delay: 320ms; }
.reveal-d5 { transition-delay: 400ms; } .reveal-d6 { transition-delay: 480ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .air-current path { animation: none; }
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-10); }
}
@media (max-width: 860px) {
  .problem-grid { grid-template-columns: 1fr; }
  .erv-callouts { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: var(--space-10); }
  .timeline::before { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-10); }
  .tgrid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .services-grid { grid-template-columns: 1fr; }
  .erv-callouts { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .hero-ctas .btn { flex: 1; }
}

/* ============ CONTACT FORM ============ */
.contact-form {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-align: left;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-field > span {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(255,255,255,0.92);
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
  color: #fff;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 12px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
  outline: none;
  font-family: inherit;
}
.contact-form textarea {
  resize: vertical;
  min-height: 96px;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255,255,255,0.55);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: rgba(255,255,255,0.65);
  background: rgba(255,255,255,0.16);
  box-shadow: 0 0 0 4px rgba(255,255,255,0.10);
}
.contact-form select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'><path d='M5 8l5 5 5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 38px;
}
.contact-form select option {
  color: #111;
  background: #fff;
}
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  opacity: 0 !important;
  pointer-events: none !important;
}
.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}
.form-actions .btn { min-width: 220px; }
.form-actions .btn:disabled { opacity: 0.6; cursor: not-allowed; }
.form-result {
  margin: 0;
  font-size: 14.5px;
  font-weight: 500;
  min-height: 1.2em;
  color: rgba(255,255,255,0.92);
}
.form-result.is-success { color: #C8FFE3; }
.form-result.is-error { color: #FFD3D3; }