:root {
  --color-primary: #0f1a2e;
  --color-secondary: #1e3a5f;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-soft: rgba(59, 130, 246, 0.08);
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-card-shadow: rgba(15, 26, 46, 0.04);
  --color-card-shadow-hover: rgba(15, 26, 46, 0.1);
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1080px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.875rem var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.site-nav a {
  color: var(--color-text-light);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--color-primary);
}

/* Hero */
.hero {
  padding: 5rem var(--spacing-md) 5.5rem;
  text-align: center;
  background: linear-gradient(170deg, #f0f4ff 0%, #e8f0fe 30%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-light);
  line-height: 1.75;
  max-width: 520px;
  margin: 0 auto;
}

/* Sections */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

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

/* Product cards */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: var(--spacing-md);
}

a.product-card {
  text-decoration: none;
  color: inherit;
  display: block;
}

.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.5rem;
  right: 1.5rem;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--color-accent), #60a5fa);
  opacity: 0;
  transition: opacity 0.2s;
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-card-shadow-hover);
}

.product-card:hover::before {
  opacity: 1;
}

.product-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
}

.product-card h3 {
  font-size: 1.1rem;
  font-weight: 650;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.product-card > p {
  font-size: 0.925rem;
  color: var(--color-text-light);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.product-card ul {
  list-style: none;
  padding: 0;
  margin-bottom: var(--spacing-sm);
}

.product-card li {
  font-size: 0.85rem;
  color: var(--color-text-light);
  padding: 0.25rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.product-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.4;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: 100px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.tech-note {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding-top: var(--spacing-xs);
}

/* About */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.about-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-text-light);
}

.about-values {
  list-style: none;
  display: grid;
  gap: 1.25rem;
}

.about-values li {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
}

.value-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.value-text strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.15rem;
}

.value-text span {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* Contact form */
.contact-intro {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  max-width: 480px;
}

.contact-form {
  max-width: 520px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.4rem;
  letter-spacing: 0.01em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-family: var(--font-stack);
  font-size: 0.925rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
  resize: vertical;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  font-family: var(--font-stack);
  font-size: 0.925rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  letter-spacing: 0.01em;
}

.btn-submit:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-submit:active {
  transform: translateY(0);
}

.hidden {
  display: none;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-md);
  background: var(--color-bg-alt);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.825rem;
  color: var(--color-text-muted);
}

.footer-links {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.825rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* Privacy policy page */
.policy-content {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

.policy-content h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.policy-content .last-updated {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.policy-content h2 {
  font-size: 1.2rem;
  font-weight: 650;
  color: var(--color-primary);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

.policy-content p,
.policy-content ul {
  font-size: 0.925rem;
  color: var(--color-text-light);
  line-height: 1.85;
  margin-bottom: var(--spacing-sm);
}

.policy-content ul {
  padding-left: 1.5rem;
}

.policy-content li {
  margin-bottom: 0.3rem;
}

/* Card arrow */
.card-arrow {
  position: absolute;
  bottom: 1.75rem;
  right: 1.75rem;
  font-size: 1.1rem;
  color: var(--color-text-muted);
  transition: color 0.2s, transform 0.2s;
}

.product-card:hover .card-arrow {
  color: var(--color-accent);
  transform: translateX(3px);
}

/* Product detail pages */
.product-hero {
  padding: 3.5rem var(--spacing-md) 3rem;
  background: linear-gradient(170deg, #f0f4ff 0%, #e8f0fe 30%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

.product-hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.product-hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.back-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--color-accent);
}

.product-hero-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.product-hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.03em;
}

.product-hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-light);
  line-height: 1.75;
  max-width: 640px;
  margin-bottom: 1.25rem;
}

/* Features grid on product pages */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 3rem;
}

.feature-block {
  display: flex;
  flex-direction: column;
}

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.875rem;
}

.feature-block h3 {
  font-size: 1.05rem;
  font-weight: 650;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.feature-block p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* Tech details on product pages */
.tech-details {
  max-width: 640px;
}

.tech-details h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.tech-details > p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.tech-list {
  list-style: none;
  padding: 0;
}

.tech-list li {
  font-size: 0.9rem;
  color: var(--color-text-light);
  padding: 0.35rem 0;
  padding-left: 1.25rem;
  position: relative;
}

.tech-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.4;
}

/* Product CTA */
.product-cta h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .site-nav {
    gap: var(--spacing-sm);
  }

  .hero {
    padding: 3.5rem var(--spacing-sm) 4rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

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

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .product-hero {
    padding: 2.5rem var(--spacing-sm) 2rem;
  }

  .product-hero h1 {
    font-size: 1.75rem;
  }
}