:root {
  --bg: #0a0f1f;
  --bg-alt: #141a33;
  --text: #e4e6eb;
  --primary: #6aa3ff;
  --secondary: #9b7dff;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  scroll-behavior: smooth;
}

h1, h2, h3 {
  margin-bottom: 15px;
  font-weight: bold;
}

.section {
  padding: 70px 10%;
  text-align: center;
}
.section.alt { background: var(--bg-alt); }

/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 10%;
  background: rgba(10, 15, 31, 0.95);
  backdrop-filter: blur(8px);
}
.brand { font-size: 24px; font-weight: bold; color: white; text-decoration: none; }
.brand span { color: var(--primary); }
.nav a { margin-left: 20px; color: var(--text); text-decoration: none; }
.nav a:hover { color: var(--primary); }

/* === HERO === */
.hero {
  height: 90vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: linear-gradient(135deg, #1a1f35, #0a0f1f);
}
.hero__content h1 { font-size: 2.5rem; }
.hero__content h1 span { color: var(--primary); }
.hero__content .sub { margin: 10px auto; font-size: 1.2rem; color: #b0b7c9; }
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  margin: 5px;
  transition: 0.3s;
}
.btn:hover { background: var(--secondary); }
.btn.secondary { background: transparent; border: 1px solid var(--primary); }

/* === SKILLS === */
.skills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.skills span {
  background: var(--bg);
  padding: 8px 14px;
  border-radius: 20px;
  border: 1px solid var(--primary);
}

/* === PROJECTS & EDUCATION === */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 20px;
}
.card {
  background: var(--bg-alt);
  padding: 20px;
  border-radius: 12px;
  transition: transform 0.3s, background 0.3s;
}
.card:hover {
  transform: translateY(-5px);
  background: #1e264a;
}
.card h3 { margin-top: 0; }

/* === FOOTER === */
.site-footer {
  text-align: center;
  padding: 20px;
  background: var(--bg-alt);
}