/* CSS Variables for Theming */
:root {
  --color-primary: #1a365d;
  --color-primary-dark: #0f2540;
  --color-accent: #0d9488;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f1f5f9;
  --color-border: #cbd5e1;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1100px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4 {
  line-height: 1.3;
  font-weight: 600;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

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

a:hover {
  color: var(--color-primary-dark);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

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

.logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
}

.logo:hover {
  color: var(--color-primary);
}

.nav-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

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

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-menu {
  display: none;
  list-style: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm);
}

.nav-menu.active {
  display: block;
}

.nav-menu li {
  margin-bottom: var(--spacing-xs);
}

.nav-menu a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text);
}

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

/* Hero Section */
.hero {
  background-color: var(--color-bg-alt);
  padding: var(--spacing-2xl) var(--spacing-sm);
  text-align: center;
}

.hero-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.hero-tagline {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* Sections */
.section {
  padding: var(--spacing-2xl) var(--spacing-sm);
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: 1.75rem;
}

/* Services Grid */
.services-grid {
  display: grid;
  gap: var(--spacing-md);
}

.service-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: box-shadow var(--transition);
}

.service-card:hover {
  box-shadow: var(--shadow-lg);
}

.service-icon {
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.service-card h3 {
  margin-bottom: var(--spacing-xs);
}

.service-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* Projects */
.projects-list {
  display: grid;
  gap: var(--spacing-md);
}

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

.project-card h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary-dark);
}

.project-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

/* About */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-intro {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.values-grid h3,
.about-background h3 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.value-item {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-sm);
  border-left: 3px solid var(--color-primary);
}

.value-item h4 {
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-xs);
}

.value-item p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

.about-background {
  margin-top: var(--spacing-xl);
}

.about-background p {
  color: var(--color-text-light);
}

/* Contact */
.contact-content {
  display: grid;
  gap: var(--spacing-xl);
  max-width: 800px;
  margin: 0 auto;
}

.contact-info p {
  margin-bottom: var(--spacing-md);
}

.contact-details {
  list-style: none;
}

.contact-details li {
  margin-bottom: var(--spacing-sm);
}

.contact-details a {
  display: inline-block;
}

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

.calendly-cta h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.125rem;
}

.calendly-cta p {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

/* Contact Form */
.contact-form {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.site-footer {
  background-color: var(--color-text);
  color: #ffffff;
  padding: var(--spacing-lg) var(--spacing-sm);
  text-align: center;
}

.site-footer p {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Tablet and Desktop */
@media (min-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.375rem; }

  .hero {
    padding: var(--spacing-2xl);
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-tagline {
    font-size: 1.25rem;
  }

  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
    position: static;
    border: none;
    padding: 0;
    background: transparent;
  }

  .nav-menu li {
    margin-bottom: 0;
    margin-left: var(--spacing-md);
  }

  .nav-menu a {
    padding: var(--spacing-xs);
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .projects-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .contact-content {
    grid-template-columns: 1fr 1.5fr;
    align-items: start;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .hero {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .hero-title {
    font-size: 3rem;
  }

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

  .section {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip to main content link (add to header if needed) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}