:root {
  --primary: #a855f7;
  --primary-light: #c084fc;
  --primary-dark: #7e22ce;
  --secondary: #14b8a6;
  --accent: #14b8a6;
  
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-muted: var(--gray-500);
  --text-white: #ffffff;
  
  --bg-primary: #ffffff;
  --bg-secondary: var(--gray-50);
  --bg-tertiary: var(--gray-100);
  
  --shadow-xs: 0 1px 2px 0 rgba(168, 85, 247, 0.08);
  --shadow-sm: 0 1px 3px 0 rgba(168, 85, 247, 0.12), 0 1px 2px -1px rgba(168, 85, 247, 0.12);
  --shadow-md: 0 4px 6px -1px rgba(168, 85, 247, 0.15), 0 2px 4px -2px rgba(168, 85, 247, 0.15);
  --shadow-lg: 0 10px 15px -3px rgba(168, 85, 247, 0.2), 0 4px 6px -4px rgba(168, 85, 247, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(168, 85, 247, 0.25), 0 8px 10px -6px rgba(168, 85, 247, 0.25);
  --shadow-2xl: 0 25px 50px -12px rgba(168, 85, 247, 0.35);
  
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--gray-50);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}



a {
  text-decoration: none;
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

p {
  max-width: 65ch;
  line-height: 1.7;
}

header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) var(--space-2xl);
  max-width: 1280px;
  margin: 0 auto;
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-xl);
  margin: 0;
  padding: 0;
  align-items: center;
}

nav ul li {
  position: relative;
}

nav ul li a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

nav ul li a:hover {
  color: var(--primary);
  background: var(--gray-100);
}

.lang-btn {
  background: transparent;
  color: var(--text-white);
  border: none;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: none;
}

.lang-btn img {
  width: 39px;
  height: auto;
  display: block;
  transition: var(--transition-base);
}

.lang-btn:hover {
  background: transparent;
  transform: scale(1.1);
}

.lang-btn:hover img {
  filter: brightness(1.1);
}

.welcome-section {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: 
    radial-gradient(at 27% 37%, hsla(282, 88%, 65%, 1) 0px, transparent 50%),
    radial-gradient(at 97% 21%, hsla(174, 73%, 47%, 1) 0px, transparent 50%),
    radial-gradient(at 52% 99%, hsla(282, 88%, 65%, 0.6) 0px, transparent 50%),
    radial-gradient(at 10% 29%, hsla(174, 73%, 47%, 0.5) 0px, transparent 50%),
    radial-gradient(at 97% 96%, hsla(282, 60%, 75%, 0.4) 0px, transparent 50%),
    radial-gradient(at 33% 50%, hsla(174, 73%, 47%, 0.3) 0px, transparent 50%),
    radial-gradient(at 79% 53%, hsla(282, 88%, 65%, 0.3) 0px, transparent 50%),
    linear-gradient(to bottom, var(--bg-primary), var(--bg-secondary));
  position: relative;
  overflow: hidden;
}

.welcome-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(80px);
  z-index: 0;
}

.welcome-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-300), transparent);
  z-index: 1;
}

.welcome-section > * {
  position: relative;
  z-index: 2;
}

.welcome-section h1 {
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

.welcome-section p {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin: 0 auto var(--space-2xl);
  max-width: 60ch;
  line-height: 1.8;
}

.welcome-section img {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-full);
  border: 4px solid var(--bg-primary);
  box-shadow: var(--shadow-xl);
  object-fit: cover;
  margin-bottom: var(--space-xl);
  transition: var(--transition-slow);
}

.welcome-section img:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-2xl);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.1);
    opacity: 0.8;
  }
}

.section, #competences, #projets, #repositories {
  padding: var(--space-3xl) var(--space-xl);
  max-width: 1280px;
  margin: 0 auto;
}

.section h2, #competences h2, #projets h2, #repositories h2 {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
  padding-bottom: var(--space-md);
}

.section h2::after, #competences h2::after, #projets h2::after, #repositories h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
}

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
}

.skill-box {
  background: var(--bg-primary);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.skill-box:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.skill-box img {
  width: 48px;
  height: auto;
  margin-bottom: var(--space-md);
  transition: var(--transition-base);
}

.skill-icon {
  width: 48px;
  height: auto;
}

.skill-box:hover img {
  transform: scale(1.1);
}

.skill-box h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  perspective: 1000px;
  height: 220px;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover .card-inner {
  transform: rotateY(180deg);
}

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--bg-primary);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-md);
}

.card-front {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.card-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-back {
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  gap: var(--space-sm);
  justify-content: space-between;
}

.card-back h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.card-back p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
  flex-grow: 1;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
}

.card-back a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  background: var(--primary);
  color: var(--text-white);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  transition: var(--transition-base);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.card-back a:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#social-media {
  padding: var(--space-3xl) var(--space-xl);
  max-width: 1280px;
  margin: 0 auto;
  text-align: center;
}

#social-media h2 {
  margin-bottom: var(--space-2xl);
  position: relative;
  padding-bottom: var(--space-md);
}

#social-media h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-primary);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-primary);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
}

.social-link img {
  width: 24px;
  height: 24px;
  transition: var(--transition-base);
}

.social-link:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
  color: var(--primary);
}

.social-link:hover img {
  transform: scale(1.1);
}

footer {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--bg-primary);
  border-top: 1px solid var(--gray-200);
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--space-3xl);
}

footer p {
  margin: 0;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  nav {
    padding: var(--space-md) var(--space-lg);
    flex-direction: column;
    gap: var(--space-md);
  }

  nav ul {
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
  }

  nav ul li a {
    font-size: 0.875rem;
    padding: var(--space-xs) var(--space-sm);
  }

  .lang-btn {
    margin-top: var(--space-sm);
  }

  .lang-btn img {
    width: 32px;
  }

  h1 { 
    font-size: clamp(2rem, 8vw, 3rem);
  }
  
  h2 { 
    font-size: clamp(1.5rem, 6vw, 2.5rem);
  }
  
  h3 { 
    font-size: clamp(1rem, 4vw, 1.5rem);
  }

  .welcome-section {
    padding: var(--space-2xl) var(--space-lg);
    min-height: 80vh;
  }

  .welcome-section p {
    font-size: 0.9375rem;
    max-width: 90%;
  }

  .welcome-section img {
    width: 150px;
    height: 150px;
    margin-bottom: var(--space-lg);
  }

  .section, #competences, #projets, #repositories, #social-media {
    padding: var(--space-2xl) var(--space-lg);
  }

  .section h2::after, #competences h2::after, #projets h2::after, #repositories h2::after {
    width: 40px;
    height: 3px;
  }

  .skills {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--space-md);
  }

  .skill-box {
    padding: var(--space-lg);
  }

  .skill-box img,
  .skill-icon {
    width: 40px;
  }

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

  .project-card {
    height: 200px;
  }

  .card-back h4 {
    font-size: 1rem;
  }

  .card-back p {
    font-size: 0.875rem;
  }

  .card-back a {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
  }

  .social-links {
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;
  }

  .social-links a {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-xs: 0.25rem;
    --space-sm: 0.375rem;
    --space-md: 0.75rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 2.5rem;
  }

  nav {
    padding: var(--space-sm) var(--space-md);
  }

  nav ul {
    gap: var(--space-xs);
  }

  nav ul li a {
    font-size: 0.8125rem;
    padding: var(--space-xs);
  }

  .lang-btn img {
    width: 28px;
  }

  h1 { 
    font-size: clamp(1.75rem, 10vw, 2.5rem);
  }
  
  h2 { 
    font-size: clamp(1.25rem, 8vw, 2rem);
  }
  
  h3 { 
    font-size: clamp(0.875rem, 5vw, 1.25rem);
  }

  .welcome-section {
    padding: var(--space-xl) var(--space-md);
    min-height: 85vh;
  }

  .welcome-section p {
    font-size: 0.875rem;
    line-height: 1.6;
  }

  .welcome-section img {
    width: 120px;
    height: 120px;
  }

  .section, #competences, #projets, #repositories, #social-media {
    padding: var(--space-xl) var(--space-md);
  }

  .skills {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .skill-box {
    padding: var(--space-md);
  }

  .skill-box img,
  .skill-icon {
    width: 36px;
    margin-bottom: var(--space-sm);
  }

  .skill-box h3 {
    font-size: 0.75rem;
  }

  .project-card {
    height: 180px;
  }

  .card-front img {
    width: 60px;
    height: 60px;
  }

  .card-back h4 {
    font-size: 0.9375rem;
    margin-bottom: var(--space-xs);
  }

  .card-back p {
    font-size: 0.8125rem;
    margin-bottom: var(--space-sm);
  }

  .card-back a {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8125rem;
  }
}