:root {
  --primary-color: #0d1b2a; /* Deep tech blue/black */
  --secondary-color: #1b263b;
  --accent-color: #0066cc; /* Trustworthy enterprise blue */
  --accent-hover: #004c99;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-light: #9ca3af;
  --bg-main: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --border-radius-sm: 4px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary-color);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; margin-bottom: 1.5rem; }
h3 { font-size: 1.75rem; margin-bottom: 1rem; }
p { margin-bottom: 1rem; color: var(--text-secondary); }

/* Layout & Containers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
}

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

.section-gray {
  background-color: var(--bg-main);
}

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

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  padding: 0.5rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  transition: var(--transition);
}

.site-header.scrolled .header-inner {
  height: 70px;
}

.logo {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-color);
  letter-spacing: -0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo i {
  color: var(--accent-color);
  font-size: 2rem;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.main-nav a {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 1rem;
  position: relative;
}

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

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.lang-switch {
  display: flex;
  gap: 0.5rem;
}

.lang-switch a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
}

.lang-switch a.active {
  background-color: var(--primary-color);
  color: var(--bg-white);
}

.lang-switch a:hover:not(.active) {
  background-color: var(--border-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--bg-white);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: var(--bg-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  background-color: transparent;
}

.btn-outline:hover {
  background-color: var(--accent-color);
  color: var(--bg-white);
}

/* Hero Section */
.hero {
  padding: 12rem 0 8rem;
  background-color: var(--primary-color);
  color: var(--bg-white);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 50%;
  background: radial-gradient(circle at center, rgba(0, 102, 204, 0.15) 0%, transparent 70%);
}

.hero .container {
  position: relative;
  z-index: 2;
}

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

.hero h1 {
  color: var(--bg-white);
  margin-bottom: 1.5rem;
  animation: slideUp 0.8s ease-out;
}

.hero p {
  color: #d1d5db;
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  animation: slideUp 1s ease-out;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  animation: slideUp 1.2s ease-out;
}

/* Features Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem;
  align-items: center;
}

.feature-card {
  background-color: var(--bg-white);
  padding: 2.5rem;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(0, 102, 204, 0.1);
  color: var(--accent-color);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

/* Stats */
.stats-section {
  background-color: var(--secondary-color);
  color: var(--bg-white);
  padding: 4rem 0;
}

.stats-grid {
  display: flex;
  justify-content: space-around;
  text-align: center;
}

.stat-item h3 {
  color: var(--bg-white);
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.stat-item p {
  color: #9ca3af;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

/* Footer */
.site-footer {
  background-color: var(--primary-color);
  color: #d1d5db;
  padding: 5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-col h4 {
  color: var(--bg-white);
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.footer-col p {
  color: #9ca3af;
}

.footer-logo {
  color: var(--bg-white);
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.footer-nav {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 0.75rem;
}

.footer-nav a {
  color: #9ca3af;
}

.footer-nav a:hover {
  color: var(--bg-white);
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #6b7280;
  font-size: 0.875rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-white);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* Animations */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 1024px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
}

@media (max-width: 768px) {
  .header-actions { display: none; }
  .main-nav { display: none; /* In a real app add a hamburger menu */ }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding: 8rem 0 5rem; }
  h1 { font-size: 2.5rem; }
  .stats-grid { flex-direction: column; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* Page Header */
.page-header {
  padding: 10rem 0 4rem;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-header h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Tables for Specs */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 2rem;
  background-color: var(--bg-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spec-table th, .spec-table td {
  padding: 1rem 1.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.spec-table th {
  background-color: var(--bg-main);
  font-weight: 600;
  color: var(--primary-color);
  width: 30%;
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: none;
}