:root {
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-surface-raised: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a7a;
  --color-text-dim: #8a8a9a;
  --color-accent: #0055ff;
  --color-accent-dim: #0044cc;
  --color-accent-light: #e8f0ff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --radius: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

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

/* Navigation */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

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

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius);
  transition: var(--transition);
}

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    transform: translateX(100%);
    transition: transform var(--transition);
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-links {
    flex-direction: column;
    width: 100%;
  }
  
  .nav-link {
    display: block;
    width: 100%;
    text-align: center;
    padding: var(--spacing-sm);
  }
  
  .nav-cta {
    width: 100%;
    justify-content: center;
  }
}

/* Hero */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-bg) 50%);
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: var(--spacing-md);
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: white;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 85, 255, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
}

/* Stats */
.stats {
  padding: var(--spacing-lg) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.stat-item {
  text-align: center;
  padding: var(--spacing-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* Services */
.services {
  padding: var(--spacing-xl) 0;
}

.services-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-light);
  border-radius: 50px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.service-card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(0, 85, 255, 0.1);
  transform: translateY(-4px);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.service-icon svg {
  width: 28px;
  height: 28px;
}

.service-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.service-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
  transition: var(--transition);
}

.service-link:hover {
  gap: 0.75rem;
}

/* Stack */
.stack {
  padding: var(--spacing-xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.stack-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-md);
}

.stack-category {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
}

.category-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.tech-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  padding: 0.5rem 0;
}

.tech-bullet {
  color: var(--color-accent);
  font-weight: 600;
}

.tech-name {
  color: var(--color-text);
  font-weight: 500;
}

.tech-tag {
  margin-left: auto;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.5rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 50px;
}

/* Page Header */
.page-header {
  padding-top: 72px;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.page-header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.page-tag {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-light);
  border-radius: 50px;
}

.page-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Content Block */
.content-block {
  padding: var(--spacing-xl) 0;
}

.content-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.content-intro {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.content-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-muted);
}

.content-body h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

.content-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.content-body p {
  margin-bottom: var(--spacing-md);
}

.content-body ul,
.content-body ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-md);
}

.content-body li {
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
}

.content-body strong {
  color: var(--color-text);
  font-weight: 600;
}

.content-body a {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent-light);
  transition: var(--transition);
}

.content-body a:hover {
  border-color: var(--color-accent);
}

.content-cta {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* Features List */
.features {
  padding: var(--spacing-xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.feature-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-md);
  align-items: start;
  padding: var(--spacing-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 85, 255, 0.08);
}

.feature-number {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1.125rem;
  border-radius: var(--radius);
  flex-shrink: 0;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.feature-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.footer-logo span {
  color: var(--color-accent);
}

.footer-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 300px;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  transition: var(--transition);
}

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

.footer-address {
  font-style: normal;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.footer-address a {
  color: var(--color-text-muted);
  transition: var(--transition);
}

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

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.social-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

.footer-legal:hover {
  color: var(--color-text);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* Selection */
::selection {
  background: var(--color-accent-light);
  color: var(--color-accent);
}