/* ========================================
   MVA Software — Premium Landing Page
   ======================================== */

:root {
  --primary: #2563EB;
  --primary-light: #3B82F6;
  --primary-dark: #1D4ED8;
  --dark: #111827;
  --dark-soft: #1F2937;
  --bg: #F8FAFC;
  --white: #FFFFFF;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, 0.04), 0 1px 2px rgba(17, 24, 39, 0.06);
  --shadow-md: 0 4px 16px rgba(17, 24, 39, 0.06), 0 2px 4px rgba(17, 24, 39, 0.04);
  --shadow-lg: 0 12px 40px rgba(17, 24, 39, 0.08), 0 4px 12px rgba(17, 24, 39, 0.04);
  --shadow-xl: 0 24px 64px rgba(17, 24, 39, 0.1), 0 8px 20px rgba(17, 24, 39, 0.04);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--dark);
  background: var(--bg);
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* Engineering Background */
#engineering-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.header.scrolled {
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: 12px 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 18px;
  z-index: 101;
}

.logo-mark {
  background: var(--dark);
  color: var(--white);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.logo-text {
  color: var(--dark);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--transition);
  position: relative;
}

.nav-links a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.nav-links a:not(.nav-cta):hover {
  color: var(--dark);
}

.nav-links a:not(.nav-cta):hover::after {
  width: 100%;
}

.nav-cta {
  background: var(--dark);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.nav-cta:hover {
  background: var(--primary);
  transform: translateY(-1px);
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 20px;
  padding: 6px 9px;
  color: var(--gray-500);
  background: transparent;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: all var(--transition);
}

.language-toggle:hover {
  color: var(--primary);
  background: var(--white);
  border-color: var(--primary-light);
}

.language-toggle-current {
  color: var(--dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 101;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  transition: transform var(--transition), opacity var(--transition);
  border-radius: 2px;
}

.nav-toggle.active span:first-child {
  transform: rotate(45deg) translate(3px, 3px);
}

.nav-toggle.active span:last-child {
  transform: rotate(-45deg) translate(3px, -3px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background: var(--white);
  color: var(--dark);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--gray-300);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--dark);
  border: 1px solid var(--gray-200);
}

.btn-ghost:hover {
  background: var(--white);
  border-color: var(--gray-300);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-inner {
  max-width: 800px;
}

.hero-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(48px, 7vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
  color: var(--dark);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, #60A5FA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.7;
  color: var(--gray-500);
  max-width: 560px;
  margin-bottom: 40px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 40px;
  border-top: 1px solid var(--gray-200);
}

.stat-value {
  display: block;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--dark);
}

.stat-label {
  display: block;
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 4px;
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--gray-200);
}

/* Sections */
.section {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--dark);
}

.section-header {
  margin-bottom: 64px;
  max-width: 600px;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-grid {
  grid-template-columns: minmax(0, 720px);
}

.about-lead {
  font-size: 20px;
  line-height: 1.7;
  color: var(--dark);
  font-weight: 500;
  margin-bottom: 20px;
}

.about-content p {
  color: var(--gray-500);
  line-height: 1.8;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.value-card {
  background: var(--white);
  padding: 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.value-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(37, 99, 235, 0.04));
  border-radius: var(--radius-md);
  color: var(--primary);
  margin-bottom: 16px;
}

.value-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.value-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* Services */
.services {
  background: var(--white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card:nth-child(n + 4),
.about-values,
.why,
.process,
.technologies,
.footer-links {
  display: none;
}

.service-card {
  background: var(--bg);
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  background: var(--white);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-number {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  display: block;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.service-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* Industries */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.industry-card {
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.industry-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 32px;
  right: 32px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.industry-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.industry-card:hover::after {
  transform: scaleX(1);
}

.industry-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.industry-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* Why Choose Us */
.why {
  background: var(--dark);
  color: var(--white);
}

.why .section-label {
  color: var(--primary-light);
}

.why .section-title {
  color: var(--white);
}

.why-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.why-lead {
  font-size: 18px;
  color: var(--gray-400);
  line-height: 1.7;
  margin-top: 20px;
}

.why-features {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.why-feature {
  display: flex;
  gap: 24px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition);
}

.why-feature:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateX(8px);
}

.why-feature-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-light);
  flex-shrink: 0;
  padding-top: 2px;
}

.why-feature h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.why-feature p {
  font-size: 14px;
  color: var(--gray-400);
  line-height: 1.7;
}

/* Process */
.process {
  background: var(--white);
}

.process-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: var(--gray-200);
}

.process-step {
  position: relative;
  text-align: center;
}

.process-dot {
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  margin: 18px auto 24px;
  position: relative;
  z-index: 2;
  box-shadow: 0 0 0 4px var(--white), 0 0 0 6px var(--gray-200);
  transition: box-shadow var(--transition);
}

.process-step:hover .process-dot {
  box-shadow: 0 0 0 4px var(--white), 0 0 0 6px var(--primary);
}

.process-card {
  background: var(--bg);
  padding: 28px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
  height: 100%;
}

.process-step:hover .process-card {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: var(--white);
}

.process-step-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.05em;
}

.process-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 12px 0 8px;
}

.process-card p {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* Technologies */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.tech-category {
  background: var(--white);
  padding: 36px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.tech-category:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tech-category h3 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  margin-bottom: 20px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-tags span {
  padding: 8px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--dark);
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}

.tech-tags span:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* CTA */
.cta {
  padding: 80px 0 120px;
}

.cta-card {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-soft) 100%);
  padding: 80px 64px;
  border-radius: var(--radius-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-card h2 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  position: relative;
}

.cta-card p {
  font-size: 18px;
  color: var(--gray-400);
  margin-bottom: 40px;
  position: relative;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

.cta .btn-primary {
  background: var(--primary);
}

.cta .btn-ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.2);
}

.cta .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  background: var(--dark);
  color: var(--gray-400);
  padding: 64px 0 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: 64px;
}

.footer-inner {
  grid-template-columns: 1fr;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 280px;
}

.footer-brand .logo-text {
  color: var(--white);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--white);
  margin-bottom: 20px;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  font-size: 14px;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--white);
}

.footer-bottom {
  grid-column: 1 / -1;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-timeline {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-timeline::before {
    display: none;
  }

  .why-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    inset: 0;
    background: rgba(248, 250, 252, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 24px;
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 20px;
    color: var(--dark);
  }

  .language-toggle {
    margin-left: auto;
    margin-right: 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .stat-divider {
    display: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .services-grid,
  .industries-grid {
    grid-template-columns: 1fr;
  }

  .process-timeline {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
  }

  .cta-card {
    padding: 48px 28px;
  }

  .section {
    padding: 80px 0;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }
}