/*
  wowd.us - Professional Infrastructure Engineering
  Main Stylesheet - Theme Independent
  
  Design principles:
  - Mobile-first responsive design
  - Semantic structure and accessibility
  - Performance-optimized custom properties
  - Jeffrey Zeldman-inspired: clarity, minimalism, progressive enhancement
  
  This file contains all structural styles and uses semantic color variables
  that are defined in separate theme files (variables-light.css, variables-dark.css)
*/

/* === Design Tokens (Non-color) === */
:root {
  /* Typography Scale */
  --font-family-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-body: 'Source Sans 3', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* Layout */
  --container-width: 1200px;
  --container-padding: var(--spacing-md);
  --border-radius: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem; /* 8px */
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* === Reset and Base Styles === */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

p {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--text-secondary);
}

a {
  color: var(--accent-primary-accessible);
  text-decoration: underline;
  text-decoration-color: var(--accent-primary-accessible);
  text-underline-offset: 0.125em;
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Remove list styling for navigation */
ul, ol {
  margin: 0;
  padding: 0;
}

nav ul {
  list-style: none;
}

/* === Layout Components === */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* === Header === */
.site-header {
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-lg) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
  text-decoration: none;
}

.spark-icon {
  font-size: var(--font-size-2xl);
  color: var(--accent-primary);
  line-height: 1;
}
.spark-icon-small {
  font-size: var(--font-size-l);
  color: var(--accent-primary);
  line-height: 1;
}

.wordmark {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.main-nav ul {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

.main-nav a {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

/* === Theme Toggle === */
.theme-toggle {
  background: none;
  border: 2px solid var(--text-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: scale(1.05);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.theme-icon {
  transition: transform var(--transition-fast);
}

.theme-toggle:hover .theme-icon {
  transform: rotate(20deg);
}

/* === Hero Section === */
.hero-section {
  padding: var(--spacing-4xl) 0;
  color: var(--text-primary);
  background: var(--hero-background);
  position: relative;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-headline {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  max-width: 20ch; /* Optimal reading width */
}

.hero-subhead {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-xl);
  max-width: 65ch; /* Optimal reading width */
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.fuzz {
  background: var(--fuzz)
}

.light {
  display: var(--display-light)
}
.dark {
  display: var(--display-dark)
}

.cta-primary,
.cta-secondary {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius);
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

.cta-primary {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary-bg);
}

.cta-primary:hover {
  background-color: var(--btn-primary-bg-hover);
  border-color: var(--btn-primary-bg-hover);
  color: var(--btn-primary-text);
  text-decoration: none;
}

.cta-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}

.cta-secondary:hover {
  background-color: var(--btn-secondary-bg-hover);
  color: var(--btn-secondary-text-hover);
  text-decoration: none;
}

/* === Section Dividers === */
.section-divider {
  display: flex;
  justify-content: center;
  padding: var(--spacing-xl) 0;
}

.divider-spark {
  width: 16px;
  height: 16px;
  opacity: 0.6;
  animation: subtle-pulse 3s ease-in-out infinite;
}

@keyframes subtle-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.8; }
}

/* === Section Base Styles === */
section {
  padding: var(--spacing-xl) 0 var(--spacing-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 60ch;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* === Services Section === */
.services-section {
  background-color: var(--bg-secondary);
}

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

.service-card {
  background-color: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  border: 1px solid var(--border-primary);
}

.service-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.service-card h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.service-card p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* === Process Section === */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.process-step {
  text-align: center;
  padding: var(--spacing-lg);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background-color: var(--step-number-bg);
  color: var(--step-number-text);
  border-radius: 50%;
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

.process-step h3 {
  margin-bottom: var(--spacing-md);
}

.process-step p {
  line-height: var(--line-height-relaxed);
}

/* === Differentiators Section === */
.differentiators-section {
  background-color: var(--bg-secondary);
}

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

.differentiator {
  background-color: var(--bg-card);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  border-left: 4px solid var(--accent-primary);
  border: 1px solid var(--border-primary);
  border-left: 4px solid var(--accent-primary);
}

.differentiator h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.differentiator p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* === Contact Section === */
.contact-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-3xl);
  max-width: 800px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-medium);
  color: var(--form-label);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: var(--spacing-md);
  border: 2px solid var(--border-input);
  border-radius: var(--border-radius);
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
  background-color: var(--form-bg);
  color: var(--form-text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--border-input-focus);
  box-shadow: 0 0 0 3px rgba(255, 183, 51, 0.2);
}

.form-group input[aria-invalid="true"],
.form-group textarea[aria-invalid="true"] {
  border-color: #e53e3e;
}

.form-help {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  line-height: var(--line-height-normal);
}

.form-submit {
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: 2px solid var(--btn-primary-bg);
  border-radius: var(--border-radius);
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.form-submit:hover {
  background-color: var(--btn-primary-bg-hover);
  border-color: var(--btn-primary-bg-hover);
}

.form-submit:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.contact-info {
  padding: var(--spacing-xl);
  background-color: var(--bg-card-secondary);
  border-radius: var(--border-radius-lg);
  align-self: start;
  border: 1px solid var(--border-primary);
}

.contact-info h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.contact-info p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

.contact-info a {
  color: var(--accent-primary-accessible);
  font-weight: var(--font-weight-medium);
}

/* === Footer === */
.site-footer {
  background-color: var(--bg-footer);
  color: var(--text-footer);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-4xl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-medium);
}

.footer-spark {
  width: 16px;
  height: 16px;
}

.footer-legal p {
  color: var(--text-footer-muted);
  font-size: var(--font-size-sm);
}

/* === Responsive Design === */

/* Tablet Styles */
@media (min-width: 768px) {
  :root {
    --container-padding: var(--spacing-xl);
  }
  
  .hero-content {
    text-align: left;
  }
  
  .hero-headline {
    font-size: var(--font-size-5xl);
  }
  
  .contact-content {
    grid-template-columns: 2fr 1fr;
  }
}

/* Desktop Styles */
@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .process-steps {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .differentiators-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Large Desktop Styles */
@media (min-width: 1200px) {
  .hero-headline {
    font-size: calc(var(--font-size-5xl) + 0.5rem);
  }
}

/* Mobile-specific adjustments */
@media (max-width: 767px) {
  .main-nav ul {
    gap: var(--spacing-lg);
  }
  
  .main-nav a {
    font-size: var(--font-size-sm);
  }
  
  .hero-section {
    padding: var(--spacing-3xl) 0;
  }
  
  .hero-headline {
    font-size: var(--font-size-3xl);
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .cta-primary,
  .cta-secondary {
    text-align: center;
    width: 100%;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  section {
    padding: var(--spacing-3xl) 0;
  }
}

/* === Accessibility Enhancements === */

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --text-secondary: var(--text-primary);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.25);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .divider-spark {
    animation: none;
  }
}

/* Focus visible improvements */
@supports selector(:focus-visible) {
  *:focus {
    outline: none;
  }
  
  *:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    border-radius: 2px;
  }
}

/* === Print Styles === */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .site-header,
  .site-footer,
  .hero-visual,
  .section-divider,
  .contact-form {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
  
  .container {
    width: 100%;
    max-width: none;
    padding: 0;
  }
}