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

:root {
  --primary: #1a2940;
  --primary-light: #2c4a6e;
  --accent: #d4a747;
  --accent-hover: #c49530;
  --text: #333;
  --text-light: #666;
  --bg: #fff;
  --bg-alt: #f5f7fa;
  --bg-dark: #0f1a2e;
  --radius: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

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

ul { list-style: none; }

img { max-width: 100%; height: auto; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-tag {
  display: inline-block;
  background: rgba(212, 167, 71, 0.12);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 16px;
}

section { padding: 80px 0; }

section h2 {
  font-size: 2.2rem;
  color: var(--primary);
  margin-bottom: 16px;
  max-width: 700px;
}

.section-subtitle {
  color: var(--text-light);
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 48px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 4px 15px rgba(212,167,71,0.3); }

.btn-secondary {
  background: var(--primary);
  color: #fff;
}
.btn-secondary:hover { background: var(--primary-light); transform: translateY(-2px); }

.btn-whatsapp {
  background: #25D366;
  color: #fff;
}
.btn-whatsapp:hover { background: #1da851; transform: translateY(-2px); box-shadow: 0 4px 15px rgba(37,211,102,0.3); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 800;
  color: #fff;
  font-size: 1.1rem;
  letter-spacing: 1px;
}

.logo img { height: 36px; }

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

.nav-links a {
  color: rgba(255,255,255,0.75);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }

.whatsapp-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #25D366;
  color: #fff;
  padding: 8px 20px;
  border-radius: 25px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.3s;
}
.whatsapp-btn:hover { background: #1da851; transform: scale(1.05); }

.menu-toggle {
  display: none;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0f1a2e 0%, #1a2940 50%, #2c4a6e 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 50%, rgba(212,167,71,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.04) 0%, transparent 50%);
}

.hero-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y="90" font-size="90" opacity="0.02" font-family="Montserrat" font-weight="900">SI</text></svg>') repeat;
  background-size: 200px;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 8px 20px;
  border-radius: 25px;
  color: rgba(255,255,255,0.8);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 32px;
}

.hero-badge i { color: var(--accent); }

.hero h1 {
  font-size: 3rem;
  color: #fff;
  margin-bottom: 20px;
}

.hero h1 span { color: var(--accent); }

.hero p {
  color: rgba(255,255,255,0.65);
  font-size: 1.15rem;
  margin-bottom: 36px;
  max-width: 600px;
}

.hero-buttons { display: flex; gap: 12px; flex-wrap: wrap; }

/* Stats */
.stats {
  background: var(--bg-dark);
  padding: 48px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item { display: flex; flex-direction: column; }

.stat-number {
  font-family: 'Montserrat', sans-serif;
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent);
}

.stat-label {
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* About */
.about { background: var(--bg); }

.about-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.about-card {
  background: var(--bg-alt);
  padding: 32px 24px;
  border-radius: var(--radius);
  text-align: center;
  transition: all 0.3s;
}

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

.about-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--accent), #e6c060);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
  color: #fff;
}

.about-card h3 { font-size: 1.1rem; color: var(--primary); margin-bottom: 12px; }
.about-card p { font-size: 0.9rem; color: var(--text-light); }

/* Segments */
.segments { background: var(--bg-alt); }

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

.segment-card {
  background: var(--bg);
  padding: 32px 24px;
  border-radius: var(--radius);
  text-align: center;
  transition: all 0.3s;
  border: 1px solid rgba(0,0,0,0.04);
}

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

.segment-icon {
  width: 56px;
  height: 56px;
  background: rgba(212, 167, 71, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.3rem;
  color: var(--accent);
}

.segment-card h3 { font-size: 1rem; color: var(--primary); margin-bottom: 8px; }
.segment-card p { font-size: 0.85rem; color: var(--text-light); }

/* Products */
.products { background: var(--bg); }

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

.product-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 40px 32px;
  transition: all 0.3s;
  border: 1px solid rgba(0,0,0,0.04);
}

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

.product-img {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.product-card h3 { font-size: 1.2rem; color: var(--primary); margin-bottom: 12px; }
.product-card > p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 20px; }

.product-features { margin-bottom: 24px; }
.product-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--text-light);
}
.product-features i { color: var(--accent); font-size: 0.75rem; }

/* Engineering */
.engineering { background: var(--bg-alt); }

.engineering-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  align-items: start;
  position: relative;
}

.step {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg);
  border-radius: var(--radius);
  position: relative;
  transition: all 0.3s;
}

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

.step-number {
  font-family: 'Montserrat', sans-serif;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--accent);
  opacity: 0.3;
  margin-bottom: 16px;
}

.step h3 { font-size: 1.1rem; color: var(--primary); margin-bottom: 12px; }
.step p { font-size: 0.85rem; color: var(--text-light); }

.step-connector { display: none; }

/* CTA */
.cta {
  background: linear-gradient(135deg, var(--primary), var(--bg-dark));
  text-align: center;
}

.cta-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.cta-icon {
  font-size: 3rem;
  color: var(--accent);
}

.cta h2 {
  color: #fff;
  max-width: 600px;
  margin: 0;
}

/* Contact */
.contact { background: var(--bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  background: var(--bg-alt);
  padding: 40px;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  transition: border-color 0.3s;
  background: var(--bg);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-info { display: flex; flex-direction: column; gap: 24px; }

.info-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.info-item > i {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: rgba(212, 167, 71, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.1rem;
}

.info-item h3 { font-size: 1rem; color: var(--primary); margin-bottom: 4px; }
.info-item p { font-size: 0.85rem; color: var(--text-light); }
.info-item a { color: var(--accent); font-weight: 600; }
.info-item a:hover { text-decoration: underline; }

/* Footer */
footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand img { height: 40px; margin-bottom: 16px; }
.footer-brand p { font-size: 0.85rem; line-height: 1.7; }

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  transition: all 0.3s;
}
.footer-social a:hover { background: var(--accent); color: #fff; }

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 20px;
}

.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { color: rgba(255,255,255,0.5); font-size: 0.85rem; transition: color 0.3s; }
.footer-col ul a:hover { color: var(--accent); }

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}
.footer-contact i { color: var(--accent); width: 16px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.footer-bottom a { color: var(--accent); }
.footer-bottom a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 992px) {
  section { padding: 60px 0; }
  section h2 { font-size: 1.8rem; }
  .hero h1 { font-size: 2.2rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .about-cards { grid-template-columns: repeat(2, 1fr); }
  .segments-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: 1fr; }
  .engineering-steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .whatsapp-btn { display: none; }
}

@media (max-width: 768px) {
  section { padding: 48px 0; }
  section h2 { font-size: 1.5rem; }
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 1rem; }
  .hero-buttons { flex-direction: column; }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-links.active { display: flex; }
  .menu-toggle { display: block; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .about-cards { grid-template-columns: 1fr; }
  .segments-grid { grid-template-columns: 1fr; }
  .engineering-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom .container { flex-direction: column; gap: 8px; text-align: center; }
  .contact-form { padding: 24px; }
}