/* ============================================
   PowerCell Solutions - Production Stylesheet
   Mobile-First Responsive Design System
   ============================================ */

/* CSS Reset and Normalize */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@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;
  }
}

body {
  min-height: 100vh;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

/* ============================================
   CSS Custom Properties - Design Tokens
   ============================================ */

:root {
  /* Color System */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #1e40af;
  --color-primary-700: #1e3a8a;
  --color-primary-800: #1e3a8a;
  --color-primary-900: #1e3a8a;
  
  --color-secondary-50: #f9fafb;
  --color-secondary-100: #f3f4f6;
  --color-secondary-200: #e5e7eb;
  --color-secondary-300: #d1d5db;
  --color-secondary-400: #9ca3af;
  --color-secondary-500: #6b7280;
  --color-secondary-600: #4b5563;
  --color-secondary-700: #374151;
  --color-secondary-800: #1f2937;
  --color-secondary-900: #111827;
  
  --color-accent-50: #fffbeb;
  --color-accent-100: #fef3c7;
  --color-accent-200: #fde68a;
  --color-accent-300: #fcd34d;
  --color-accent-400: #fbbf24;
  --color-accent-500: #f59e0b;
  --color-accent-600: #d97706;
  --color-accent-700: #b45309;
  --color-accent-800: #92400e;
  --color-accent-900: #78350f;
  
  --color-text-primary: #1f2937;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #6b7280;
  --color-text-inverse: #ffffff;
  
  --color-background-primary: #ffffff;
  --color-background-secondary: #f9fafb;
  --color-background-tertiary: #f3f4f6;
  
  --color-border: #e5e7eb;
  --color-border-hover: #d1d5db;
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Typography System */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  --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: 1.75;
  
  /* Spacing System */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Layout */
  --container-max-width: 1280px;
  --container-padding: var(--space-md);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Z-index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ============================================
   Base Typography
   ============================================ */

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background-primary);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary-600);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

strong {
  font-weight: var(--font-weight-semibold);
}

/* ============================================
   Skip Link (Accessibility)
   ============================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary-600);
  color: var(--color-text-inverse);
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  z-index: var(--z-tooltip);
  border-radius: 0 0 var(--radius-md) 0;
}

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

/* ============================================
   Header & Navigation
   ============================================ */

header {
  background-color: var(--color-background-primary);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

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

.logo {
  display: flex;
  align-items: center;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-600);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
}

.nav-menu a:hover {
  background-color: var(--color-background-secondary);
  color: var(--color-primary-600);
  text-decoration: none;
}

.nav-menu a[aria-current="page"] {
  color: var(--color-primary-600);
  background-color: var(--color-primary-50);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-4xl) var(--container-padding);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
}

.hero-tagline {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-lg);
  color: var(--color-primary-100);
}

.hero-description {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  color: var(--color-primary-50);
}

.hero-image {
  margin-top: var(--space-2xl);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   Call-to-Action Button
   ============================================ */

.cta-button {
  display: inline-block;
  background-color: var(--color-accent-500);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-lg);
  padding: var(--space-md) var(--space-2xl);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.cta-button:hover {
  background-color: var(--color-accent-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.cta-button:active {
  transform: translateY(0);
}

.cta-button:focus-visible {
  outline: 2px solid var(--color-accent-300);
  outline-offset: 2px;
}

/* ============================================
   Section Containers
   ============================================ */

section {
  padding: var(--space-4xl) var(--container-padding);
}

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

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

.section-header h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   Products Section
   ============================================ */

.products {
  background-color: var(--color-background-secondary);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.product-card {
  background-color: var(--color-background-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.product-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
  transform: scale(1.05);
}

.product-content {
  padding: var(--space-xl);
}

.product-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
  color: var(--color-primary-600);
}

.product-content p {
  margin-bottom: var(--space-lg);
  line-height: var(--line-height-relaxed);
}

.product-features {
  list-style: none;
  padding: 0;
}

.product-features li {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  position: relative;
  color: var(--color-text-secondary);
}

.product-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
}

/* ============================================
   About Section
   ============================================ */

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.about-text h3 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--color-primary-600);
}

.about-text h3:first-child {
  margin-top: 0;
}

.about-text p {
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-lg);
}

.value-propositions {
  list-style: none;
  padding: 0;
}

.value-propositions li {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
  position: relative;
}

.value-propositions li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary-600);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
}

.value-propositions strong {
  color: var(--color-primary-600);
  display: block;
  margin-bottom: var(--space-xs);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.stat-card {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
}

.stat-number {
  display: block;
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-sm);
}

.stat-label {
  display: block;
  font-size: var(--font-size-base);
  color: var(--color-primary-100);
}

/* ============================================
   Contact Section
   ============================================ */

.contact {
  background-color: var(--color-background-secondary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

.contact-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.contact-card {
  background-color: var(--color-background-primary);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
  color: var(--color-primary-600);
}

.contact-card p {
  margin-bottom: var(--space-sm);
}

.contact-card a {
  font-weight: var(--font-weight-medium);
}

.contact-note {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
}

.contact-card address {
  font-style: normal;
  line-height: var(--line-height-relaxed);
}

.hours-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm) var(--space-md);
}

.hours-list dt {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.hours-list dd {
  color: var(--color-text-secondary);
}

.contact-map {
  background-color: var(--color-background-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.map-placeholder {
  background: linear-gradient(135deg, var(--color-primary-100) 0%, var(--color-primary-200) 100%);
  padding: var(--space-3xl);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.map-placeholder p {
  font-size: var(--font-size-lg);
  color: var(--color-primary-700);
  max-width: 400px;
}

/* ============================================
   Footer
   ============================================ */

footer {
  background-color: var(--color-secondary-900);
  color: var(--color-secondary-300);
  padding: var(--space-3xl) var(--container-padding) var(--space-xl);
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
}

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

.footer-brand h3 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
}

.footer-brand p {
  color: var(--color-secondary-400);
}

.footer-nav h4,
.footer-social h4 {
  color: var(--color-text-inverse);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
}

.footer-nav ul,
.social-links {
  list-style: none;
  padding: 0;
}

.footer-nav li,
.social-links li {
  margin-bottom: var(--space-sm);
}

.footer-nav a,
.social-links a {
  color: var(--color-secondary-400);
  transition: color var(--transition-fast);
}

.footer-nav a:hover,
.social-links a:hover {
  color: var(--color-text-inverse);
}

.footer-bottom {
  border-top: 1px solid var(--color-secondary-700);
  padding-top: var(--space-lg);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-secondary-500);
  margin-bottom: var(--space-sm);
}

.footer-legal {
  font-size: var(--font-size-sm);
}

.footer-legal a {
  color: var(--color-secondary-500);
  margin: 0 var(--space-sm);
}

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

/* ============================================
   Responsive Design - Tablet (768px)
   ============================================ */

@media (min-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --container-padding: var(--space-xl);
  }
  
  h1 {
    font-size: var(--font-size-5xl);
  }
  
  .hero {
    padding: var(--space-4xl) var(--container-padding);
  }
  
  .hero h1 {
    font-size: var(--font-size-5xl);
  }
  
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-content {
    grid-template-columns: 2fr 1fr;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  
  .contact-content {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact-info {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* ============================================
   Responsive Design - Desktop (1024px)
   ============================================ */

@media (min-width: 1024px) {
  :root {
    --container-padding: var(--space-2xl);
  }
  
  .nav-container {
    padding: var(--space-lg) var(--container-padding);
  }
  
  .hero {
    padding: var(--space-4xl) var(--container-padding) var(--space-3xl);
  }
  
  .hero-content {
    text-align: left;
  }
  
  .hero-description {
    margin-left: 0;
  }
  
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact-info {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  header,
  footer,
  .nav-menu,
  .cta-button,
  .hero-image,
  .product-image,
  .map-placeholder {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
  
  h1,
  h2,
  h3 {
    page-break-after: avoid;
  }
  
  img {
    max-width: 100% !important;
  }
  
  a[href^="http"]:after {
    content: " (" attr(href) ")";
  }
  
  @page {
    margin: 2cm;
  }
}