/* ============================================================
   EHS Flux Corporation — Stylesheet
   Blue, fresh, clean and professional corporate theme.
   Palette:
     --navy:   #073B70  (deep navy, footer + strong headings)
     --blue:   #0969B8  (corporate blue, primary buttons)
     --aqua:   #16A9E8  (bright water blue, restrained accent)
     --light:  #EAF8FF  (light aqua)
     --bg:     #F5FAFE  (very light blue background)
     --white:  #FFFFFF
     --text:   #17324D  (primary text)
     --muted:  #52677D  (secondary text)
     --border: #D8EAF7  (subtle borders)
   ============================================================ */

:root {
  --navy: #073B70;
  --navy-700: #05508f;
  --navy-600: #073B70;
  --blue: #0969B8;
  --blue-600: #08599b;
  --aqua: #16A9E8;
  --aqua-light: #4dc4f0;
  --light: #EAF8FF;
  --light-2: #dbf1ff;
  --bg: #F5FAFE;
  --white: #FFFFFF;
  --text: #17324D;
  --muted: #52677D;
  --muted-2: #7a90a8;
  --border: #D8EAF7;
  --border-strong: #b6d8ee;

  --success: #1e8e3e;
  --success-bg: #e6f4ea;
  --error: #c0392b;
  --error-bg: #fdecea;
  --warning: #c2410c;
  --warning-bg: #fef3e8;

  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-heading: 'Manrope', 'Inter', system-ui, sans-serif;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 2px rgba(7, 59, 112, 0.05);
  --shadow-sm: 0 1px 3px rgba(7, 59, 112, 0.08), 0 1px 2px rgba(7, 59, 112, 0.04);
  --shadow-md: 0 4px 12px rgba(7, 59, 112, 0.08), 0 2px 4px rgba(7, 59, 112, 0.04);
  --shadow-lg: 0 12px 32px rgba(7, 59, 112, 0.12), 0 4px 12px rgba(7, 59, 112, 0.08);
  --shadow-xl: 0 20px 60px rgba(7, 59, 112, 0.18);

  --gradient-water: linear-gradient(135deg, var(--navy) 0%, var(--blue) 60%, var(--aqua) 100%);
  --gradient-water-soft: linear-gradient(135deg, var(--light) 0%, var(--bg) 100%);
  --gradient-ripple: radial-gradient(circle at 50% 50%, rgba(22, 169, 232, 0.18) 0%, transparent 60%);

  --nav-height: 76px;
  --topbar-height: 40px;
  --container: 1200px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
a { color: var(--blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--navy); text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }

/* Focus indicators */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
  text-decoration: none;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 1rem;
  background: var(--navy);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 2000;
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition);
}
.skip-link:focus { top: 0.5rem; color: #fff; }

/* Container */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================================
   TOP INFORMATION BAR
   ============================================================ */
.topbar {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.85rem;
  padding: 0.5rem 0;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.topbar-left, .topbar-right { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  font-weight: 500;
}
.topbar-item:hover { color: var(--aqua-light); text-decoration: none; }
.topbar-icon { width: 14px; height: 14px; flex-shrink: 0; opacity: 0.9; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand-logo { width: 44px; height: 44px; object-fit: contain; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--navy);
  letter-spacing: -0.01em;
}
.brand-tagline {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  font-weight: 500;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link {
  padding: 0.5rem 0.85rem;
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover {
  color: var(--blue);
  background: var(--bg);
  text-decoration: none;
}
.nav-link.active { color: var(--blue); font-weight: 600; }
.nav-cta { margin-left: 0.5rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 32px;
  height: 24px;
  padding: 4px 0;
}
.nav-toggle-bar {
  display: block;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  font-size: 0.92rem;
  font-weight: 600;
  font-family: var(--font-body);
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 0.01em;
}
.btn:hover { text-decoration: none; }
.btn svg { width: 16px; height: 16px; }
.btn-primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
  box-shadow: 0 2px 6px rgba(9, 105, 184, 0.25);
}
.btn-primary:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
  box-shadow: 0 4px 14px rgba(7, 59, 112, 0.3);
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}
.btn-secondary:hover {
  background: var(--blue);
  color: #fff;
}
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1rem; }
.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.85rem; }

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding: 5rem 0; }
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem;
}
.section-title { margin: 0.5rem 0 1rem; }
.section-intro { color: var(--muted); font-size: 1.05rem; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--aqua);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.eyebrow-accent { color: var(--blue); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  background: var(--bg);
  overflow: hidden;
  padding: 5rem 0 4rem;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 1200px 600px at 80% 50%, rgba(22, 169, 232, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 800px 500px at 20% 20%, rgba(9, 105, 184, 0.08) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, var(--white) 100%);
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero-content { max-width: 620px; }
.hero-heading {
  color: var(--navy);
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  line-height: 1.15;
  margin: 0.75rem 0 1.25rem;
  letter-spacing: -0.02em;
}
.hero-description {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.65;
  margin-bottom: 2rem;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.hero-trust-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}
.hero-trust-item svg {
  width: 16px;
  height: 16px;
  color: var(--aqua);
}

.hero-visual {
  position: relative;
}
.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 6px solid var(--white);
}
.hero-visual-badge {
  position: absolute;
  bottom: -20px;
  right: -10px;
  width: 130px;
  height: 130px;
  background: var(--gradient-water);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  border: 6px solid var(--white);
}
.hero-visual-badge-inner {
  display: flex;
  flex-direction: column;
  text-align: center;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.1;
}
.hero-visual-badge .badge-label { font-size: 0.78rem; letter-spacing: 0.08em; }
.hero-visual-badge .badge-value { font-size: 1.1rem; }

/* ============================================================
   SERVICES
   ============================================================ */
.services { background: var(--white); }
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.service-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0;
  text-align: left;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-water);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover {
  background: var(--white);
  border-color: var(--aqua);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.service-card:hover::before { transform: scaleX(1); }
.service-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--light);
}
.service-card-content { padding: 1.5rem 1.75rem 2rem; }
.service-title {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  color: var(--navy);
}
.service-desc {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}

/* ============================================================
   WATER TREATMENT EQUIPMENT
   ============================================================ */
.water-treatment { background: var(--bg); }
.water-treatment-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1.25rem;
}
.water-treatment-card {
  grid-column: span 2;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.water-treatment-card:nth-child(n+4) { grid-column: span 3; }
.water-treatment-card:hover {
  border-color: var(--aqua);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.water-treatment-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--white);
}
.water-treatment-card:first-child .water-treatment-image { object-fit: contain; }
.water-treatment-card-content { padding: 1rem 1.1rem 1.25rem; }
.water-treatment-title {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}
.water-treatment-subtitle {
  color: var(--blue);
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.4;
  margin: -0.15rem 0 0.45rem;
}
.water-treatment-desc {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 0;
}

/* ============================================================
   ZLD SECTION
   ============================================================ */
.zld-section {
  background: linear-gradient(135deg, var(--light) 0%, var(--bg) 100%);
  position: relative;
  overflow: hidden;
}
.zld-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: var(--gradient-ripple);
  pointer-events: none;
}
.zld-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.zld-content { max-width: 600px; }
.zld-desc {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 1rem 0 1.75rem;
  line-height: 1.7;
}
.zld-checklist {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.5rem;
}
.zld-checklist li {
  position: relative;
  padding-left: 1.8rem;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
}
.zld-checklist li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.15rem;
  width: 18px;
  height: 18px;
  background: var(--blue);
  border-radius: 50%;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'><polyline points='20,6 9,17 4,12'/></svg>") center/contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'><polyline points='20,6 9,17 4,12'/></svg>") center/contain no-repeat;
}
.zld-visual {
  position: relative;
}
.zld-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 6px solid var(--white);
  background: var(--white);
}

/* ============================================================
   INDUSTRIES
   ============================================================ */
.industries { background: var(--white); }
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.industry-card {
  position: relative;
  isolation: isolate;
  min-height: 320px;
  background: var(--navy);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.industry-card::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(180deg, rgba(12, 27, 36, 0.04) 10%, rgba(12, 27, 36, 0.02) 38%, rgba(12, 27, 36, 0.78) 100%);
  pointer-events: none;
}
.industry-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.industry-image {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) brightness(1.04);
  transition: transform var(--transition);
}
.industry-card:hover .industry-image { transform: scale(1.04); }
.industry-card-content {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
}
.industry-icon {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  background: rgba(17, 35, 43, 0.42);
  color: var(--white);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.48);
  backdrop-filter: blur(8px);
}
.industry-icon svg { width: 22px; height: 22px; }
.industry-copy {
  width: 100%;
  max-width: 34rem;
  padding: 0.25rem 0;
}
.industry-title {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  color: var(--white);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.34);
}
.industry-desc {
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.34);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about { background: var(--bg); }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 4rem;
  align-items: start;
}
.about-visual { position: sticky; top: calc(var(--nav-height) + 1rem); }
.about-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 6px solid var(--white);
}
.about-content { max-width: 620px; }
.about-sub { color: var(--blue); font-size: 1.1rem; font-weight: 600; margin-bottom: 1rem; }
.about-desc { color: var(--muted); margin-bottom: 1.25rem; line-height: 1.7; }

.strengths-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 2rem;
}
.strength {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: all var(--transition);
}
.strength:hover {
  border-color: var(--aqua);
  box-shadow: var(--shadow-sm);
}
.strength-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--blue), var(--aqua));
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}
.strength-icon svg { width: 22px; height: 22px; }
.strength-title { font-size: 1rem; color: var(--navy); margin-bottom: 0.3rem; }
.strength-desc { color: var(--muted); font-size: 0.88rem; margin: 0; line-height: 1.5; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background: var(--white); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 4rem;
  align-items: start;
}
.contact-info { padding-right: 1rem; }
.contact-intro { color: var(--muted); margin: 1rem 0 2rem; line-height: 1.65; }
.contact-details { list-style: none; padding: 0; margin: 0; }
.contact-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.contact-detail-item:last-child { border-bottom: none; }
.contact-detail-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--light), var(--light-2));
  color: var(--blue);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-detail-icon svg { width: 20px; height: 20px; }
.contact-detail-label {
  font-size: 0.78rem;
  color: var(--muted-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin: 0 0 0.2rem;
}
.contact-detail-value {
  color: var(--navy);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  word-break: break-word;
}
.contact-detail-value:hover { color: var(--blue); text-decoration: underline; }

.contact-form {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}
.form-row { margin-bottom: 1.25rem; }
.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.form-field { display: flex; flex-direction: column; }
.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
  display: block;
}
.req { color: var(--error); margin-left: 0.15rem; }
.opt { color: var(--muted-2); font-weight: 500; font-size: 0.82rem; }
.form-input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--white);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text);
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(9, 105, 184, 0.12);
}
.form-input::placeholder { color: var(--muted-2); }
.form-textarea { resize: vertical; min-height: 130px; font-family: inherit; }
.form-hint { font-size: 0.8rem; color: var(--muted-2); margin-top: 0.35rem; }
.form-error {
  color: var(--error);
  font-size: 0.82rem;
  margin-top: 0.35rem;
  min-height: 0;
  font-weight: 500;
}
.form-error:not(:empty) {
  padding: 0.4rem 0.65rem;
  background: var(--error-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--error);
  min-height: 1rem;
}
.form-input[aria-invalid="true"], .form-input.invalid {
  border-color: var(--error);
  background: var(--error-bg);
}

/* intl-tel-input overrides */
.iti { width: 100%; display: block; }
.iti .iti__flag-container { font-family: var(--font-body); }
.iti--separate-dial-code .iti__selected-flag { background-color: var(--bg); }
.iti--separate-dial-code.iti--show-selected-dial-code .iti__selected-flag:hover { background-color: var(--light); }
.iti__country-list { font-family: var(--font-body); border-radius: var(--radius); box-shadow: var(--shadow-md); border: 1px solid var(--border); }

/* Honeypot */
.hp-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.form-disclaimer { font-size: 0.82rem; color: var(--muted-2); max-width: 380px; }
.form-disclaimer a { color: var(--blue); text-decoration: underline; }
.form-status {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 500;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.form-status.success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid #c6e4cb;
  border-left: 4px solid var(--success);
}
.form-status.error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid #f5c6cb;
  border-left: 4px solid var(--error);
}
.form-status.loading {
  background: var(--light);
  color: var(--blue);
  border: 1px solid var(--border);
}

/* Button spinner */
.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.btn.is-loading .btn-label { opacity: 0.7; }
.btn.is-loading .btn-spinner { display: inline-block; }
.btn.is-loading { pointer-events: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.85);
  padding: 4rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}
.footer-col-brand { max-width: 380px; }
.footer-brand { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.footer-logo { background: rgba(255, 255, 255, 0.06); border-radius: var(--radius-sm); padding: 4px; }
.footer-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  color: #fff;
  margin: 0;
}
.footer-tagline {
  font-size: 0.82rem;
  color: var(--aqua-light);
  margin: 0.15rem 0 0;
  letter-spacing: 0.02em;
}
.footer-desc {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 1rem 0 0;
}
.footer-heading {
  color: #fff;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  font-family: var(--font-heading);
}
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--aqua-light); text-decoration: none; }
.footer-contact-list .footer-contact-label {
  display: inline;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.82rem;
  font-weight: 500;
}
.footer-address a { display: block; line-height: 1.55; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-copy, .footer-meta {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.55);
  margin: 0;
}
.footer-meta { color: var(--aqua-light); font-weight: 500; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 3rem; }
  .hero-content { max-width: none; }
  .hero-visual { max-width: 560px; margin: 0 auto; }
  .water-treatment-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .water-treatment-card, .water-treatment-card:nth-child(n+4) { grid-column: span 1; }
  .zld-inner { grid-template-columns: 1fr; gap: 3rem; }
  .about-inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-visual { position: static; max-width: 560px; margin: 0 auto; }
  .contact-inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .contact-info { padding-right: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .section { padding: 3.5rem 0; }
  .container { padding: 0 1rem; }
  .topbar { font-size: 0.78rem; padding: 0.4rem 0; }
  .topbar-inner { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
  .topbar-left, .topbar-right { gap: 1rem; flex-wrap: wrap; }
  .topbar-item span { white-space: normal; }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0.25rem;
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link { padding: 0.75rem 0.5rem; border-bottom: 1px solid var(--border); }
  .nav-link:last-of-type { border-bottom: none; }
  .nav-cta { margin: 0.5rem 0 0; }
  .nav-toggle { display: flex; }

  .brand-tagline { display: none; }

  .hero { padding: 2.5rem 0; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .hero-trust { gap: 0.5rem 1rem; }
  .hero-visual-badge { width: 100px; height: 100px; }

  .water-treatment-grid { grid-template-columns: 1fr; }
  .zld-checklist { grid-template-columns: 1fr; }
  .strengths-grid { grid-template-columns: 1fr; }

  .form-row-2 { grid-template-columns: 1fr; }
  .contact-form { padding: 1.5rem; }
  .form-actions { flex-direction: column; align-items: stretch; }
  .form-disclaimer { max-width: none; }
  .btn { width: 100%; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; align-items: center; }
}

@media (max-width: 480px) {
  .section-title { font-size: 1.6rem; }
  .service-card-content { padding: 1.5rem 1.25rem; }
  .industry-card { min-height: 300px; }
  .industry-card-content { padding: 1.25rem; }
  .contact-form { padding: 1.25rem; }
  .hero-visual-badge { display: none; }
  .hero-image { border-width: 4px; }
}

/* Print */
@media print {
  .topbar, .nav-toggle, .hero-visual-badge, .footer { display: none; }
  .navbar { position: static; }
  .hero, .section { padding: 1.5rem 0; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}