:root {
  
  --color-primary: #333333; 
  --color-secondary: #007BFF; 
  --color-accent: #6F42C1; 
  --color-accent-light: #A78BFA; 
  --color-silver: #C0C0C0; 
  --color-white: #FFFFFF;
  --color-black: #000000;

  --font-family-headings: 'Montserrat', sans-serif;
  --font-family-body: 'Open Sans', sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  --font-size-h1: clamp(2.5rem, 5vw, 4rem);
  --font-size-h2: clamp(2rem, 4vw, 3rem);
  --font-size-h3: clamp(1.75rem, 3.5vw, 2.5rem);
  --font-size-h4: clamp(1.5rem, 3vw, 2rem);
  --font-size-h5: clamp(1.25rem, 2.5vw, 1.75rem);
  --font-size-h6: clamp(1rem, 2vw, 1.5rem);
  --font-size-body: clamp(1rem, 2vw, 1.125rem);
  --font-size-small: 0.875rem;
  
  --line-height-headings: 1.2;
  --line-height-body: 1.6;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;

  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);

  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;

  --z-nav: 1000;
  --z-modal: 2000;
  --z-overlay: 3000;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #1a1a1a;
    --color-secondary: #4dabf7;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-primary);
  background-color: var(--color-white);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-sm);
  font-family: var(--font-family-headings);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-headings);
}

p {
  margin: 0 0 var(--spacing-sm);
}

ul, ol {
  margin: 0;
  padding-left: var(--spacing-md);
}

li {
  margin-bottom: 0.25rem;
}

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

a:hover,
a:focus {
  color: var(--color-accent);
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

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

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  padding: 0;
  margin: 0;
}

body,
h1, h2, h3, h4, h5, h6,
p, li, a {
  color: var(--color-primary); 
}

@media (prefers-contrast: high) {
  :root {
    --color-primary: #000000;
    --color-white: #FFFFFF;
  }
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }
h5 { font-size: var(--font-size-h5); }
h6 { font-size: var(--font-size-h6); }

.lead {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
}

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

.pl-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.pl-flex-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.pl-section {
  padding: var(--spacing-lg) 0;
}

.pl-vh-full {
  min-height: 100vh;
}

.pl-btn {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius);
  font-weight: var(--font-weight-medium);
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
}

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

.pl-btn-primary:hover,
.pl-btn-primary:focus {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.pl-btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.pl-btn-secondary:hover,
.pl-btn-secondary:focus {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.pl-btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.pl-btn-outline:hover,
.pl-btn-outline:focus {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.pl-card {
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.pl-card:hover,
.pl-card:focus-within {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.pl-card-img {
  width: 100%;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  object-fit: cover;
  height: 200px;
}

.pl-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.pl-card-title {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary);
}

.pl-card-text {
  color: var(--color-primary);
  flex: 1;
}

.row[class*='g-'] > [class*='col-']:has([class*='card']) {
  display: flex !important;
  flex-direction: column !important;
}

[class*='card'] {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.pl-form-input,
.pl-form-textarea,
.pl-form-select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-silver);
  border-radius: var(--border-radius);
  font-size: var(--font-size-body);
  transition: border-color var(--transition-fast);
  background-color: var(--color-white);
  color: var(--color-primary);
}

.pl-form-input:focus,
.pl-form-textarea:focus,
.pl-form-select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

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

.pl-navbar {
  background: rgba(51, 51, 51, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  padding: var(--spacing-xs) 0;
  transition: all var(--transition-normal);
}

.pl-nav-brand {
  font-family: var(--font-family-headings);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
}

.pl-nav-link {
  color: var(--color-silver);
  padding: var(--spacing-sm) var(--spacing-md);
  transition: color var(--transition-fast);
}

.pl-nav-link:hover,
.pl-nav-link:focus,
.pl-nav-link.active {
  color: var(--color-secondary);
}

.pl-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 767.98px) {
  .pl-nav-toggle {
    display: block;
  }
  
  .pl-navbar-collapse {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-primary);
    flex-direction: column;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  
  .pl-navbar-collapse.active {
    max-height: 500px;
  }
  
  .pl-nav-link {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-silver);
  }
}

.pl-footer {
  background: var(--color-primary);
  color: var(--color-silver);
  padding: var(--spacing-lg) 0;
}

.pl-footer a {
  color: var(--color-silver);
}

.pl-footer a:hover {
  color: var(--color-secondary);
}

.pl-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.pl-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23C0C0C0" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
  opacity: 0.1;
  animation: pl-float 20s ease-in-out infinite;
}

@keyframes pl-float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

.pl-hero-content {
  text-align: center;
  z-index: 2;
  position: relative;
}

.pl-hero h1 {
  color: var(--color-white);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.pl-portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.pl-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  justify-content: center;
}

.pl-filter-btn {
  @extend .pl-btn;
  @extend .pl-btn-outline;
  background: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-small);
}

.pl-filter-btn.active {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

@media (min-width: 768px) {
  .pl-container {
    padding: 0 var(--spacing-lg);
  }
  
  .pl-section {
    padding: var(--spacing-xl) 0;
  }
}

@media (min-width: 1024px) {
  .pl-portfolio-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  }
}

.pl-btn,
.pl-card,
.pl-nav-link,
.pl-form-input {
  transition: all var(--transition-normal);
}

.pl-scale-hover:hover {
  transform: scale(1.05);
}

.pl-glow-hover:hover {
  box-shadow: 0 0 20px rgba(111, 66, 193, 0.3);
}

.pl-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.pl-reveal.active {
  opacity: 1;
  transform: translateY(0);
}

#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.swiper {
  padding: var(--spacing-sm);
}

.swiper-slide {
  display: flex;
  justify-content: center;
  align-items: center;
}

.swiper-pagination-bullet-active {
  background: var(--color-accent);
}

#three-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.pl-lazy {
  background: linear-gradient(90deg, var(--color-silver) 25%, transparent 25%, transparent 75%, var(--color-silver) 75%), 
              linear-gradient(var(--color-silver) 25%, transparent 25%, transparent 75%, var(--color-silver) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 10px 10px;
  min-height: 200px;
}

*:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

body, .pl-card, .pl-hero, .pl-footer {
  background-color: #333333!important; 
  color: var(--color-primary);
}

.pl-dark-section {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.pl-dark-section a,
.pl-dark-section p,
.pl-dark-section h1,
.pl-dark-section h2,
.pl-dark-section h3,
.pl-dark-section h4,
.pl-dark-section h5,
.pl-dark-section h6 {
  background-color: #333333!important; 
  color: var(--color-white);
}

.pl-text-center { text-align: center; }
.pl-text-left { text-align: left; }
.pl-mb-sm { margin-bottom: var(--spacing-sm); }
.pl-mt-lg { margin-top: var(--spacing-lg); }
.pl-hidden { display: none; }
.pl-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}