/*
 * OptiChains Consulting – Stylesheet
 * ─────────────────────────────────
 * Structure
 *   1.  CSS Custom Properties (design tokens)
 *   2.  Reset / Base
 *   3.  Typography helpers
 *   4.  Layout helpers
 *   5.  Buttons
 *   6.  Header / Navigation
 *   7.  Hero Section
 *   8.  Services Section
 *   9.  Industries Section
 *  10.  Approach Section
 *  11.  Why OptiChains Section
 *  12.  About Section
 *  13.  Contact Section
 *  14.  Footer
 *  15.  Reveal-on-scroll animation
 *  16.  Responsive overrides
 */

/* ══════════════════════════════════════════════
   1. CSS CUSTOM PROPERTIES
   ── To change colors, edit values here only ──
══════════════════════════════════════════════ */
:root {
  /* Brand colors */
  --color-primary:        #1a4b8c;   /* Deep navy blue */
  --color-primary-dark:   #123568;
  --color-primary-light:  #2563b8;
  --color-accent:         #0ea5e9;   /* Sky / highlight blue */
  --color-accent-dark:    #0284c7;

  /* Neutrals */
  --color-dark:           #1a1f2e;
  --color-dark-2:         #2d3447;
  --color-mid:            #4b5568;
  --color-muted:          #6b7280;
  --color-light:          #f0f4fa;
  --color-light-2:        #e8edf5;
  --color-white:          #ffffff;

  /* Semantic */
  --color-success:        #16a34a;
  --color-error:          #dc2626;

  /* Typography */
  --font-sans:  'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont,
                'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;          /* 16px */
  --line-height:    1.65;

  /* Spacing scale */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;
  --space-4xl:  6rem;

  /* Layout */
  --max-width:     1200px;
  --section-pad:   5rem;
  --border-radius: 0.75rem;
  --border-radius-sm: 0.375rem;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md:  0 4px 12px rgba(0,0,0,.10), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.12), 0 4px 8px rgba(0,0,0,.06);

  /* Transitions */
  --transition: 0.22s ease;
}


/* ══════════════════════════════════════════════
   2. RESET / BASE
══════════════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-dark);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* Skip-to-content link (accessibility) */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-sm);
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus-visible {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}


/* ══════════════════════════════════════════════
   3. TYPOGRAPHY HELPERS
══════════════════════════════════════════════ */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }
h4 { font-size: 1rem; font-weight: 600; }

p { margin-bottom: var(--space-md); }
p:last-child { margin-bottom: 0; }

.section-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-sm);
}

.section-sub {
  color: var(--color-mid);
  font-size: 1.05rem;
  max-width: 52ch;
}


/* ══════════════════════════════════════════════
   4. LAYOUT HELPERS
══════════════════════════════════════════════ */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-xl);
}

.section-pad {
  padding-block: var(--section-pad);
}

.section-alt {
  background-color: var(--color-light);
}

.section-header {
  margin-bottom: var(--space-3xl);
}
.section-header h2 {
  margin-block: var(--space-xs) var(--space-md);
}


/* ══════════════════════════════════════════════
   5. BUTTONS
══════════════════════════════════════════════ */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  border: 2px solid transparent;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
  text-align: center;
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover, .btn:focus-visible {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn-primary:hover, .btn-primary:focus-visible {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover, .btn-outline:focus-visible {
  background-color: rgba(255,255,255,0.12);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-full {
  display: block;
  width: 100%;
}


/* ══════════════════════════════════════════════
   6. HEADER / NAVIGATION
══════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(26, 31, 46, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  height: 68px;
}

/* Brand / logo */
.brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.01em;
  white-space: nowrap;
  text-decoration: none;
  flex-shrink: 0;
}
.brand:hover, .brand:focus-visible {
  color: var(--color-accent);
  text-decoration: none;
}
.brand-icon {
  font-size: 1.4rem;
  color: var(--color-accent);
}
.brand-accent {
  color: var(--color-accent);
}

/* Primary nav */
.primary-nav {
  flex: 1;
}
.primary-nav ul {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}
.primary-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition), background-color var(--transition);
}
.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--color-white);
  background-color: rgba(255,255,255,0.08);
  text-decoration: none;
}

.header-cta {
  flex-shrink: 0;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

/* Hamburger button (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  border-radius: var(--border-radius-sm);
}
.hamburger-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* ══════════════════════════════════════════════
   7. HERO SECTION
══════════════════════════════════════════════ */
.hero {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-primary-dark) 60%, #1a4b8c 100%);
  padding-block: var(--space-4xl) var(--space-3xl);
  overflow: hidden;
  position: relative;
}

/* Subtle geometric background shape */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(14,165,233,.12) 0%, transparent 70%),
    radial-gradient(ellipse 30% 40% at 10% 80%, rgba(26,75,140,.3) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
  position: relative;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.hero-copy h1 {
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  line-height: 1.12;
}

.hero-sub {
  color: rgba(255,255,255,0.78);
  font-size: 1.1rem;
  margin-bottom: var(--space-xl);
  max-width: 44ch;
}

/* Bullet list */
.hero-bullets {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.hero-bullets li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: rgba(255,255,255,0.85);
  font-size: 0.95rem;
  font-weight: 500;
}
.bullet-icon {
  color: var(--color-accent);
  font-size: 0.8rem;
}

.hero-ctas {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* KPI dashboard panel */
.hero-panel {
  display: flex;
  justify-content: center;
}

.kpi-card {
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg), 0 0 40px rgba(14,165,233,.1);
}

.kpi-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.kpi-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.kpi-dot--green { background-color: #22c55e; box-shadow: 0 0 6px #22c55e; }

.kpi-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.kpi-label {
  display: block;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 4px;
  font-weight: 500;
}

.kpi-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.kpi-value--up   { color: #4ade80; }
.kpi-value--down { color: var(--color-accent); }

.kpi-bar {
  height: 5px;
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
  overflow: hidden;
}
.kpi-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #4ade80, #22c55e);
  border-radius: 3px;
  transition: width 1.2s ease;
}
.kpi-bar-fill--accent {
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
}

.kpi-footer {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(14,165,233,0.15);
  color: var(--color-accent);
  border: 1px solid rgba(14,165,233,0.25);
}


/* ══════════════════════════════════════════════
   8. SERVICES SECTION
══════════════════════════════════════════════ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-xl);
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-light-2);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-light);
}

.card-icon {
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  display: flex;
}

.card h3 {
  margin-bottom: var(--space-sm);
  color: var(--color-dark);
}
.card p {
  color: var(--color-mid);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.card-outcomes {
  border-top: 1px solid var(--color-light-2);
  padding-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.card-outcomes li {
  font-size: 0.85rem;
  color: var(--color-mid);
  padding-left: 1rem;
  position: relative;
}
.card-outcomes li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent-dark);
  font-size: 0.8rem;
}


/* ══════════════════════════════════════════════
   9. INDUSTRIES SECTION
══════════════════════════════════════════════ */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.industry-tile {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-light-2);
  transition: box-shadow var(--transition), transform var(--transition);
}
.industry-tile:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.industry-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: var(--space-md);
}
.industry-tile h3 {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}
.industry-tile p {
  font-size: 0.875rem;
  color: var(--color-mid);
}


/* ══════════════════════════════════════════════
   10. APPROACH SECTION
══════════════════════════════════════════════ */
.approach-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-xl);
  list-style: none;
}

.approach-step {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-light-2);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.approach-step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Decorative number watermark */
.approach-step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.step-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-light-2);
  line-height: 1;
  margin-bottom: var(--space-sm);
  font-variant-numeric: tabular-nums;
}

.step-body h3 {
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}
.step-body p {
  font-size: 0.92rem;
  color: var(--color-mid);
}


/* ══════════════════════════════════════════════
   11. WHY OPTICHAINS SECTION
══════════════════════════════════════════════ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.why-card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-light-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: box-shadow var(--transition), transform var(--transition);
}
.why-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.why-icon {
  color: var(--color-primary);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-light);
  border-radius: var(--border-radius-sm);
  flex-shrink: 0;
}
.why-card h3 {
  font-size: 1rem;
  color: var(--color-dark);
}
.why-card p {
  font-size: 0.9rem;
  color: var(--color-mid);
  margin-bottom: 0;
}


/* ══════════════════════════════════════════════
   12. ABOUT SECTION
══════════════════════════════════════════════ */
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about-copy .section-eyebrow { margin-bottom: var(--space-sm); }
.about-copy h2 { margin-bottom: var(--space-xl); }
.about-copy p { color: var(--color-mid); margin-bottom: var(--space-lg); }
.about-copy .btn { margin-top: var(--space-sm); }

/* Visual card on the right */
.about-shape {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
}

.about-stat {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.about-stat:last-of-type { border-bottom: none; }

.stat-icon {
  color: var(--color-accent);
  font-size: 1rem;
  flex-shrink: 0;
}
.stat-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
}

.about-divider {
  height: 1px;
  background: rgba(255,255,255,0.15);
  margin: var(--space-lg) 0;
}

.about-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.platform-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255,255,255,0.1);
  color: var(--color-accent);
  border: 1px solid rgba(14,165,233,0.3);
}


/* ══════════════════════════════════════════════
   13. CONTACT SECTION
══════════════════════════════════════════════ */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-4xl);
  align-items: start;
}

.contact-info h3 {
  margin-bottom: var(--space-lg);
  color: var(--color-dark);
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}
.contact-list li {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.95rem;
}
.contact-label {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}
.contact-list a {
  color: var(--color-primary-light);
  word-break: break-all;
}

.contact-note {
  background: var(--color-white);
  border-left: 3px solid var(--color-primary-light);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}
.contact-note p {
  font-size: 0.9rem;
  color: var(--color-mid);
  margin-bottom: 0;
  line-height: 1.6;
}

/* Form */
.contact-form-wrap {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-light-2);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-dark-2);
}
.form-group label span {
  color: var(--color-error);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  border: 1.5px solid var(--color-light-2);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-dark);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
  appearance: none;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(37,99,184,.15);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-muted);
  opacity: 0.8;
}
.form-group input.is-invalid,
.form-group textarea.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220,38,38,.12);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Form status message */
.form-status {
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-sm);
  display: none;
}
.form-status.is-success {
  display: block;
  background: #dcfce7;
  color: #15803d;
  border: 1px solid #86efac;
}
.form-status.is-info {
  display: block;
  background: #e0f2fe;
  color: #0369a1;
  border: 1px solid #7dd3fc;
}
.form-status.is-error {
  display: block;
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}


/* ══════════════════════════════════════════════
   14. FOOTER
══════════════════════════════════════════════ */
.site-footer {
  background-color: var(--color-dark);
  color: rgba(255,255,255,0.65);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  padding-block: var(--space-3xl);
}

.footer-brand .brand {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  display: inline-flex;
}
.footer-brand .brand:hover { color: var(--color-accent); }
.footer-tagline {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.45);
  line-height: 1.7;
  margin-bottom: 0;
}

.footer-nav h4,
.footer-contact h4 {
  color: var(--color-white);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.footer-nav a,
.footer-contact a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-nav a:hover,
.footer-nav a:focus-visible,
.footer-contact a:hover,
.footer-contact a:focus-visible {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-contact p {
  font-size: 0.875rem;
  margin-bottom: var(--space-sm);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-block: var(--space-lg);
}
.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
  text-align: center;
  margin-bottom: 0;
}


/* ══════════════════════════════════════════════
   15. REVEAL-ON-SCROLL ANIMATION
══════════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Users who prefer no motion */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
}


/* ══════════════════════════════════════════════
   16. RESPONSIVE OVERRIDES
══════════════════════════════════════════════ */

/* ── Tablet ── */
@media (max-width: 900px) {
  :root {
    --section-pad: 3.5rem;
  }

  .header-inner {
    gap: var(--space-md);
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: var(--color-dark);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: var(--space-lg) var(--space-xl);
    z-index: 999;
  }
  .primary-nav.is-open {
    display: block;
  }
  .primary-nav ul {
    flex-direction: column;
    gap: 0;
  }
  .primary-nav a {
    display: block;
    padding: var(--space-md);
    font-size: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.04);
  }
  .primary-nav a:last-child { border-bottom: none; }

  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  .hero-panel {
    order: -1;
  }
  .kpi-card {
    max-width: 100%;
  }

  .about-inner {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ── Mobile ── */
@media (max-width: 600px) {
  :root {
    --section-pad: 2.5rem;
  }

  .container {
    padding-inline: var(--space-md);
  }

  h1 { font-size: clamp(1.8rem, 8vw, 2.4rem); }
  h2 { font-size: clamp(1.4rem, 6vw, 2rem); }

  .hero {
    padding-block: var(--space-2xl);
  }

  .hero-ctas {
    flex-direction: column;
  }
  .hero-ctas .btn {
    text-align: center;
  }

  .cards-grid,
  .approach-steps,
  .why-grid {
    grid-template-columns: 1fr;
  }

  .industry-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .contact-form-wrap {
    padding: var(--space-lg);
  }
}

/* ── Very small screens ── */
@media (max-width: 380px) {
  .industry-grid {
    grid-template-columns: 1fr;
  }
}