:root {
  --bg: #0f172a;
  --text: #ffffff;
  --card: rgba(255,255,255,0.08);
  --accent: #38bdf8;
}

body.light {
  --bg: #f5f7fa;
  --text: #111;
  --card: rgba(0,0,0,0.05);
}

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

/* NAV */
.header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  justify-content: space-between;
  padding: 15px 40px;
}

.nav-links {
  display: flex;
  gap: 15px;
  list-style: none;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
}

/* HERO */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

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

/* SECTION */
.section {
  padding: 80px 20px;
  text-align: center;
}

/* GLASS */
.glass {
  background: var(--card);
  backdrop-filter: blur(10px);
  border-radius: 15px;
}

/* CARD */
.card {
  background: var(--card);
  padding: 20px;
  margin: 10px;
  border-radius: 12px;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-10px) scale(1.02);
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(250px,1fr));
  gap: 20px;
}

/* SKILLS */
.skills span {
  background: var(--accent);
  color: #000;
  padding: 8px 15px;
  margin: 5px;
  border-radius: 20px;
}

/* IMAGE */
img {
  width: 100%;
  border-radius: 10px;
}

/* BUTTON */
button {
  background: var(--accent);
  border: none;
  padding: 10px 20px;
  cursor: pointer;
}

/* ANIMATION */
.hidden {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.6s;
}

.show {
  opacity: 1;
  transform: translateY(0);
}

/* MOBILE */
@media(max-width:768px){
  .nav-links {
    display: none;
    flex-direction: column;
  }
}