/* ============================================================
   Infinity Automation & Engineering — main.css
   Version 3.2 Spec Compliant | WCAG 2.2 AA | Mobile-first
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --color-primary:       #0B3C5D;
  --color-primary-dark:  #082C45;
  --color-primary-light: #1A5276;
  --color-accent:        #F39C12;
  --color-accent-hover:  #E08E0B;
  --color-bg:            #F5F7FA;
  --color-surface:       #FFFFFF;
  --color-text:          #1A1A1A;
  --color-text-muted:    #555555;
  --color-footer:        #0A2A40;
  --color-success:       #27AE60;
  --color-error:         #E74C3C;
  --color-border:        #E1E5EB;
  --radius:              10px;
  --shadow:              0 4px 20px rgba(11, 60, 93, 0.08);
  --shadow-lg:           0 10px 40px rgba(11, 60, 93, 0.12);
  --header-height:       72px;
  --container:           1200px;
  --font-heading:        'Poppins', system-ui, sans-serif;
  --font-body:           'Inter', system-ui, sans-serif;
  --transition:          0.25s ease;
}

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

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

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

img, video, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }
ul, ol { list-style: none; }
button, input, textarea, select { font: inherit; color: inherit; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary);
}

h1 { font-size: clamp(1.9rem, 5vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.35rem); }
p { margin-bottom: 1rem; color: var(--color-text-muted); }
p:last-child { margin-bottom: 0; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 64px 0;
}
@media (min-width: 768px) {
  .section { padding: 80px 0; }
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}
.section-header h2 { margin-bottom: 12px; }
.section-header p { font-size: 1.05rem; }

.grid-2 { display: grid; gap: 32px; }
.grid-3 { display: grid; gap: 24px; }
.grid-4 { display: grid; gap: 24px; }

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Skip Link (WCAG) ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 20px;
  z-index: 10000;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
}
.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  min-width: 48px;
  padding: 12px 28px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform 0.15s ease;
  text-align: center;
}
.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-white {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}
.btn-white:hover {
  background: transparent;
  color: #fff;
  border-color: #fff;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-icon {
  width: 52px;
  height: 52px;
  background: rgba(11, 60, 93, 0.08);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--color-primary);
  font-size: 1.5rem;
}
.card h3 { margin-bottom: 8px; font-size: 1.15rem; }
.card p { flex-grow: 1; font-size: 0.95rem; }
.card .card-link {
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.card .card-link:hover { gap: 8px; }

/* ---------- HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-surface);
  box-shadow: 0 1px 0 var(--color-border);
  height: var(--header-height);
  transition: box-shadow var(--transition), height var(--transition);
}
.site-header.scrolled {
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 12px;
  position: relative;
}
.header-inner .logo {
  min-width: 0;
  flex: 1 1 auto;
}
.header-inner .logo > span:not(.logo-mark) {
  overflow: hidden;
  text-overflow: ellipsis;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
  white-space: nowrap;
}
.logo:hover { color: var(--color-primary); }
.logo-mark {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* Desktop Nav */
.nav-desktop {
  display: none;
  align-items: center;
  gap: 4px;
}
@media (min-width: 1024px) {
  .nav-desktop { display: flex; }
}
.nav-desktop a {
  padding: 8px 14px;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-text);
  border-radius: 6px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-primary);
  background: rgba(11, 60, 93, 0.06);
}
.nav-desktop .btn { margin-left: 8px; padding: 10px 20px; min-height: 44px; }

/* Mobile Toggle */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  flex-shrink: 0;
  background: rgba(11, 60, 93, 0.06);
  border: 1px solid var(--color-border);
  cursor: pointer;
  padding: 10px;
  border-radius: 8px;
  z-index: 1001;
  -webkit-tap-highlight-color: transparent;
}
.nav-toggle:hover {
  background: rgba(11, 60, 93, 0.1);
}
.nav-toggle:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}
/* Animate to X when open */
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}
@media (min-width: 1024px) {
  .nav-toggle { display: none !important; }
}

/* Mobile Nav Panel */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  z-index: 1000;
  padding: 16px 20px 32px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: 0 8px 24px rgba(11, 60, 93, 0.12);
}
.nav-mobile.open {
  display: block;
}
.nav-mobile a {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  font-weight: 500;
  font-size: 1.05rem;
  color: var(--color-text);
  border-radius: var(--radius);
  min-height: 48px;
  border-bottom: 1px solid var(--color-border);
}
.nav-mobile a:last-child {
  border-bottom: none;
}
.nav-mobile a:hover,
.nav-mobile a.active {
  background: rgba(11, 60, 93, 0.06);
  color: var(--color-primary);
}
.nav-mobile .btn {
  width: 100%;
  margin-top: 16px;
  justify-content: center;
  border-bottom: none !important;
}
body.menu-open {
  overflow: hidden;
  touch-action: none;
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 80px 0 100px;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(243, 156, 18, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 40%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 680px; }
.hero h1 {
  color: #fff;
  margin-bottom: 16px;
}
.hero .lead {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.88);
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-badge {
  display: inline-block;
  background: rgba(243, 156, 18, 0.2);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
  letter-spacing: 0.03em;
}

/* ---------- Stats ---------- */
.stats {
  background: var(--color-primary);
  color: #fff;
  padding: 48px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  text-align: center;
}
@media (min-width: 768px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}
.stat-number {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.1;
}
.stat-label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  margin-top: 4px;
}

/* ---------- Why Us ---------- */
.why-item {
  text-align: center;
  padding: 16px;
}
.why-item .card-icon {
  margin: 0 auto 16px;
}

/* ---------- Testimonials ---------- */
.testimonial {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  position: relative;
}
.testimonial blockquote {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: 20px;
  line-height: 1.7;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.author-info strong {
  display: block;
  color: var(--color-primary);
  font-size: 0.95rem;
}
.author-info span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- CTA Band ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.cta-band h2 { color: #fff; margin-bottom: 12px; }
.cta-band p { color: rgba(255,255,255,0.85); max-width: 560px; margin: 0 auto 28px; }

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--color-footer);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 0;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  gap: 40px;
  padding-bottom: 48px;
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; }
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { color: rgba(255,255,255,0.65); margin-bottom: 20px; }
.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 16px;
  font-weight: 600;
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.65);
  padding: 5px 0;
  min-height: 32px;
}
.footer-col a:hover { color: var(--color-accent); }
.footer-contact-item {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  align-items: flex-start;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--color-accent); }

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: 60px 0;
  text-align: center;
}
.page-hero h1 { color: #fff; margin-bottom: 8px; }
.page-hero p { color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto; }

/* ---------- Forms ---------- */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: border-color var(--transition);
  min-height: 48px;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(11, 60, 93, 0.15);
}
.form-group textarea { min-height: 140px; resize: vertical; }
.form-group .error-msg {
  color: var(--color-error);
  font-size: 0.85rem;
  margin-top: 4px;
  display: none;
}
.form-group.has-error input,
.form-group.has-error textarea {
  border-color: var(--color-error);
}
.form-group.has-error .error-msg { display: block; }
.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.checkbox-group input {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--color-primary);
}

/* ---------- Contact Layout ---------- */
.contact-grid {
  display: grid;
  gap: 40px;
}
@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 1fr 1.2fr; }
}
.contact-info-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}
.contact-info-item {
  display: flex;
  gap: 14px;
  margin-bottom: 24px;
}
.contact-info-item:last-child { margin-bottom: 0; }
.contact-info-icon {
  width: 44px;
  height: 44px;
  background: rgba(11, 60, 93, 0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
  font-size: 1.2rem;
}

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.bg-white { background: var(--color-surface); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* Industry / Service icons using emoji as lightweight placeholders */
.icon-emoji { font-size: 1.6rem; line-height: 1; }

/* ---------- 404 / Thank You ---------- */
.centered-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
}
.centered-page h1 { font-size: 4rem; color: var(--color-primary); margin-bottom: 8px; }
.centered-page p { margin-bottom: 28px; max-width: 480px; }

/* ---------- Clients strip ---------- */
.clients-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 32px 48px;
  opacity: 0.6;
  filter: grayscale(1);
}
.clients-strip span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}