/* ================================================
   Unity Portfolio - Design System
   Pure black, minimalist, with cool interactions
   ================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
  /* Colors - Minimalist Black Theme */
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-card: #111111;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --border: #222222;
  --border-hover: #3b82f6;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --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: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Effects */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.5);
  --shadow-glow-lg: 0 0 40px rgba(59, 130, 246, 0.6);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 70px;
  --border-radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ================================================
   Navigation
   ================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-container {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  transition: all var(--transition-base);
}

.nav-logo:hover {
  color: var(--accent);
  text-shadow: var(--shadow-glow);
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--space-sm) 0;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-base);
  box-shadow: var(--shadow-glow);
}

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

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
}

/* ================================================
   Hero Section
   ================================================ */
.hero {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  padding-top: calc(var(--nav-height) + var(--space-3xl));
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  letter-spacing: -2px;
  margin-bottom: var(--space-lg);
  opacity: 0;
}

.hero-title .highlight {
  color: var(--accent);
  text-shadow: var(--shadow-glow);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-2xl);
  opacity: 0;
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-3xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  opacity: 0;
  animation: bounce 2s infinite;
}

.hero-scroll svg {
  width: 24px;
  height: 24px;
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }

  40% {
    transform: translateY(10px);
  }

  60% {
    transform: translateY(5px);
  }
}

/* ================================================
   Section Styles
   ================================================ */
.section {
  padding: var(--space-3xl) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-2xl);
  letter-spacing: -1px;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin-top: var(--space-md);
  box-shadow: var(--shadow-glow);
}

/* ================================================
   Project Cards Grid
   ================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(30px);
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-5px);
}

/* Card Media (Screenshots/Video) */
.card-media {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-secondary);
}

.card-media img,
.card-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .card-media img,
.project-card:hover .card-media video {
  transform: scale(1.05);
}

/* Screenshot Carousel */
.carousel {
  position: relative;
  width: 100%;
  height: 100%;
}

.carousel-track {
  display: flex;
  height: 100%;
  transition: transform var(--transition-base);
}

.carousel-slide {
  min-width: 100%;
  height: 100%;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-nav {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--space-sm);
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.carousel-dot.active {
  background: var(--accent);
  box-shadow: var(--shadow-glow);
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
}

.project-card:hover .carousel-arrow {
  opacity: 1;
}

.carousel-arrow:hover {
  background: var(--accent);
}

.carousel-arrow.prev {
  left: var(--space-md);
}

.carousel-arrow.next {
  right: var(--space-md);
}

/* Card Content */
.card-content {
  padding: var(--space-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

.project-card:hover .card-title {
  color: var(--accent);
}

.card-description {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

/* Tech Tags */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.tag {
  font-size: 0.75rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Card Actions */
.card-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

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

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow-glow);
}

/* Ripple Effect */
.btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Open Source Badge */
.open-source-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  color: #10b981;
  margin-left: auto;
}

.open-source-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  animation: pulse 2s infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

/* ================================================
   About Section
   ================================================ */
.about-content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  width: 100%;
  max-width: 800px;
}

.about-link-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-2xl);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  color: var(--text-primary);
}

.about-link-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-8px);
  background: var(--bg-secondary);
}

.about-link-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  transition: all var(--transition-base);
}

.about-link-card:hover .about-link-icon {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: var(--shadow-glow);
}

.about-link-icon svg {
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

.about-link-card:hover .about-link-icon svg {
  color: var(--text-primary);
}

.about-link-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-base);
}

.about-link-card:hover h3 {
  color: var(--accent);
}

.about-link-card p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}


/* ================================================
   Footer
   ================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-link {
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.footer-link:hover {
  color: var(--accent);
  text-shadow: var(--shadow-glow);
}

.footer-link svg {
  width: 24px;
  height: 24px;
}

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

/* ================================================
   Loading States
   ================================================ */
.skeleton {
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--bg-card) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }
}

/* Lazy Load Image */
.lazy-img {
  opacity: 0;
  transition: opacity var(--transition-base);
}

.lazy-img.loaded {
  opacity: 1;
}

/* ================================================
   Magnetic Button Effect (JS Enhanced)
   ================================================ */
.magnetic-btn {
  transition: transform var(--transition-fast);
}

/* ================================================
   Cursor Glow Effect
   ================================================ */
.cursor-glow {
  position: fixed;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.cursor-glow.visible {
  opacity: 1;
}

/* ================================================
   Responsive Design
   ================================================ */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    padding: var(--space-xl);
    gap: var(--space-lg);
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: var(--space-xl);
    padding-top: calc(var(--nav-height) + var(--space-xl));
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

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

  .about-links {
    grid-template-columns: 1fr;
  }

  .cursor-glow {
    display: none;
  }
}

/* ================================================
   Accessibility
   ================================================ */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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