/* === CSS Variables === */
:root {
  /* Brand Colors */
  --color-primary: #4a148c;  /* Deep Purple */
  --color-primary-light: #7c43bd;
  --color-primary-dark: #12005e;
  --color-secondary: #00bfa5;  /* Teal Accent */
  --color-secondary-light: #5df2d6;
  --color-secondary-dark: #008e76;

  /* Neutral Colors */
  --color-background: #0a1929;  /* Dark Blue-Gray */
  --color-surface: #132f4c;
  --color-error: #ff5252;
  --color-success: #69f0ae;
  --color-warning: #ffd740;

  /* Text Colors */
  --color-text-primary: rgba(255, 255, 255, 0.95);
  --color-text-secondary: rgba(255, 255, 255, 0.8);
  --color-text-disabled: rgba(255, 255, 255, 0.5);

  /* Gradients */
  --gradient-primary: linear-gradient(
    135deg, 
    var(--color-primary) 0%,
    var(--color-primary-light) 100%
  );
  
  --gradient-secondary: linear-gradient(
    135deg,
    var(--color-secondary) 0%,
    var(--color-secondary-light) 100%
  );

  --gradient-surface: linear-gradient(
    180deg,
    var(--color-surface) 0%,
    var(--color-background) 100%
  );

  /* Spacing */
  --space-unit: 0.25rem;
  --space-xs: calc(var(--space-unit) * 1);  /* 0.25rem */
  --space-sm: calc(var(--space-unit) * 2);  /* 0.5rem */
  --space-md: calc(var(--space-unit) * 4);  /* 1rem */
  --space-lg: calc(var(--space-unit) * 6);  /* 1.5rem */
  --space-xl: calc(var(--space-unit) * 8);  /* 2rem */
  --space-2xl: calc(var(--space-unit) * 12); /* 3rem */
  --space-3xl: calc(var(--space-unit) * 16); /* 4rem */

  /* Typography */
  --font-family-primary: 'Assistant', sans-serif;
  --font-family-code: 'Fira Code', monospace;
  
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-3xl: clamp(2rem, 1.6rem + 2vw, 3rem);
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Effects */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  --blur-sm: 8px;
  --blur-md: 12px;
  --blur-lg: 16px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Z-index */
  --z-negative: -1;
  --z-default: 1;
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-popover: 400;
  --z-tooltip: 500;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-2xl);
  direction: rtl;
}

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

/* === Layout === */
.main-content {
  flex: 1;
  width: min(100% - 2rem, 1200px);
  margin-inline: auto;
  padding-top: calc(70px + var(--spacing-6));
  position: relative;
  z-index: var(--z-content);
}

/* Background Gradient & Effects */
.bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  background: linear-gradient(
    180deg,
    var(--color-bg-primary) 0%,
    var(--color-bg-secondary) 50%,
    var(--color-bg-tertiary) 100%
  );
}

/* Floating Shapes */
.floating-shapes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.floating-circle {
  position: absolute;
  border-radius: 50%;
  background: var(--color-brand);
  opacity: 0.1;
  filter: blur(50px);
}

.floating-circle-1 {
  width: 600px;
  height: 600px;
  top: -200px;
  right: -100px;
  animation: float-slow 20s infinite;
}

.floating-circle-2 {
  width: 400px;
  height: 400px;
  bottom: -100px;
  left: -150px;
  animation: float-slow 25s infinite reverse;
}

/* Cards & Containers */
.glass-card {
  background: rgba(255, 255, 255, var(--bg-opacity-light));
  backdrop-filter: blur(var(--blur-sm));
  -webkit-backdrop-filter: blur(var(--blur-sm));
  border: 1px solid rgba(255, 255, 255, var(--bg-opacity-medium));
  border-radius: 16px;
  transition: all 0.3s ease;
}

.glass-card:hover {
  background: rgba(255, 255, 255, var(--bg-opacity-medium));
  transform: translateY(-5px);
  border-color: var(--color-accent-base);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-4);
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);

}

/* Links */
a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary-light);
}

html[dir="rtl"] body.is-hebrew {
  text-align: right;
}

html[dir="rtl"] .nav-menu,
html[dir="rtl"] .footer,
html[dir="rtl"] .portfolio-main,
html[dir="rtl"] .electrical-main {
  direction: rtl;
}

html[dir="rtl"] .proof-item {
  border-left: 0 !important;
  border-right: 4px solid var(--portfolio-teal, var(--electrical-green)) !important;
}

html[dir="rtl"] .project-points li {
  padding-left: 0 !important;
  padding-right: 18px !important;
}

html[dir="rtl"] .project-points li::before {
  left: auto !important;
  right: 0 !important;
}

html[dir="rtl"] .copyright {
  text-align: right !important;
}

/* Buttons */
.btn {
  width: 100%;
  justify-content: center;
}
.main-content .btn {
  width: 100%;
  justify-content: center;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-text-primary);
}

/* === Responsive Design === */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* === Animations === */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateX(30px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
.logo {
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-accent) !important;
}
.animate-fade-in {  will-change: transform, opacity; }
.animate-scale-in { animation: scaleIn 0.5s ease-out; }
.animate-slide-in { animation: slideIn 0.5s ease-out; }

/* Container */
.container {
  width: min(100% - var(--space-xl), 1200px);
  margin-inline: auto;
  padding: var(--space-xl) var(--space-lg);
}

/* Section Styling */
.section {
  padding: var(--space-2xl) 0;
}

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

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* Hero Section */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: var(--gradient-surface);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(74, 20, 140, 0.2) 0%,
    transparent 70%
  );
  z-index: var(--z-negative);
}

/* Article Cards */
.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.02) 100%
  );
  border-radius: var(--radius-2xl);
  overflow: hidden;
  position: relative;
  padding: var(--space-lg);
}

.article-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.article-title {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.article-excerpt {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* Navigation Pills */
.nav-pills {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

  .nav-pill {
    padding: var(--space-sm) var(--space-md);
    color: var(--color-text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
  }
  
  .nav-pill:hover,
  .nav-pill.active {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
  }
  
  /* Form Elements */
  .form-group {
    margin-bottom: var(--space-lg);
  }
  
  .form-label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
  }
  
  .form-input,
  .form-textarea {
    width: 100%;
    padding: var(--space-md);
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-background);
    transition: all var(--transition-fast);
  }
  
  .form-input:focus,
  .form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(74, 20, 140, 0.2);
  }
  
  .form-textarea {
    min-height: 120px;
    resize: vertical;
  }
  
  /* Feature Cards */
  .feature-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
    color: var(--color-background);
  }
  
  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
  }
  
  /* Loading States */
  .skeleton {
    background: linear-gradient(
      90deg,
      #f0f0f0 25%,
      #e0e0e0 50%,
      #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
  }
  
  @keyframes loading {
    to { background-position: -200% 0; }
  }
  
  /* Utility Classes */
  .text-center { text-align: center; }
  .text-right { text-align: right; }
  .text-left { text-align: left; }
  
  .flex { display: flex; }
  .items-center { align-items: center; }
  .justify-between { justify-content: space-between; }
  .flex-col { flex-direction: column; }
  
  .gap-sm { gap: var(--space-sm); }
  .gap-md { gap: var(--space-md); }
  .gap-lg { gap: var(--space-lg); }
  
  .mt-auto { margin-top: auto; }
  .mb-sm { margin-bottom: var(--space-sm); }
  .mb-md { margin-bottom: var(--space-md); }
  .mb-lg { margin-bottom: var(--space-lg); }
  
  /* Light Theme */
  :root {
    color-scheme: light;
    
    --color-background: #ffffff;
    --color-surface: #f8fafc;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-disabled: #94a3b8;
    
    /* Shadow adjustments for light theme */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }
  
  /* Card adjustments for light theme */
  .card {
    background: var(--color-surface);
    border: 1px solid rgba(0, 0, 0, 0.05);
  }
  
  .glass-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(var(--blur-sm));
    border: 1px solid rgba(0, 0, 0, 0.05);
  }
  
  /* Accessibility */
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
      animation: none !important;
      transition: none !important;
    }
  }
  .lazy-load {
    opacity: 0;
    transition: opacity var(--transition-default);
  }
  
  .lazy-load.loaded {
    opacity: 1;
  }
  .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
  
  /* Print Styles */
  @media print {
    body {
      background: none;
      color: black;
    }
    
    .no-print {
      display: none !important;
    }
    
    .container {
      max-width: none;
      padding: 0;
    }
  }
  
  /* RTL Support */
  [dir="rtl"] {
    .nav-pill {
      margin-right: 0;
      margin-left: var(--space-sm);
    }
    
    .form-select {
      background-position: left 1rem center;
      padding-right: var(--space-md);
      padding-left: 2.5rem;
    }
  }