:root {
  --bg: #f8f9fa;
  --text: #222;
  --accent: #6c63ff;
  --card: #fff;
  --shadow: 0 2px 10px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
}

[data-theme="dark"] {
  --bg: #121212;
  --text: #eee;
  --accent: #8a7aff;
  --card: #1e1e1e;
  --shadow: 0 2px 10px rgba(0,0,0,0.6);
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card);
  padding: 1rem 2rem;
  box-shadow: var(--shadow);
  z-index: 10;
}

.logo span {
  color: var(--accent);
  font-weight: 700;
}

.nav a {
  margin: 0 1rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  transition: color var(--transition);
}

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

#themeToggle {
  border: none;
  background: none;
  font-size: 1.2rem;
  cursor: pointer;
}

/* Hero */
.hero {
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--accent) 20%, transparent 100%);
}

.hero-content {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.hero h1 span {
  color: var(--accent);
}

/* Sections */
.section {
  padding: 4rem 10%;
  animation: fadeUp 0.6s ease both;
}

.section h2 {
  color: var(--accent);
  text-align: center;
  margin-bottom: 2rem;
}

/* Cards */
.card {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  margin: 1rem 0;
  transition: transform var(--transition);
}

.card:hover {
  transform: translateY(-5px);
}

.projects-grid, .skills-grid {
  display: grid;
  gap: 1.5rem;
}

.projects-grid {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.skills-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Boutons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  transition: var(--transition);
  font-weight: 600;
}

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

.btn.ghost {
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn:hover {
  transform: scale(1.05);
}

/*animation fade */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
  background: var(--card);
  box-shadow: var(--shadow);
}

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}