:root {
  --bg: radial-gradient(circle at top, #020617, #000000);
  --bg-card: rgba(15, 23, 42, 0.9);
  --text: #e5e7eb;
  --text-light: #9ca3af;
  --accent: #38bdf8;
  --accent-strong: #60a5fa;
  --radius: 18px;
  --shadow: 0 10px 40px rgba(0,0,0,0.8);
  --transition: 0.35s ease;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  scroll-behavior: smooth;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 2.5rem;
}

/* ---------------- HERO ---------------- */
.hero {
  position: relative;
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(180deg, rgba(15,23,42,0.95), rgba(0,0,0,0.95));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 3rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -50%;
  background: radial-gradient(circle, rgba(56,189,248,0.12), transparent 60%);
}

.hero * {
  position: relative;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: rgba(56,189,248,0.15);
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 56px);
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.portfolio-label {
  font-family: 'Sora', sans-serif;
  font-weight: 700;
  font-size: clamp(1rem, 3vw, 1.4rem);
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.85;
  display: inline-block;
}

.hero-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.hero-tags a {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(56,189,248,0.25);
  background: rgba(15,23,42,0.8);
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

.hero-tags a:hover {
  background: var(--accent);
  color: #020617;
  transform: translateY(-3px);
}

/* ---------------- SECTIONS ---------------- */
section {
  margin-bottom: 3rem;
}

section h2 {
  font-family: 'Sora', sans-serif;
  font-weight: 600;
  font-size: 27px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  color: #ffffff;
  text-shadow: 0 0 12px rgba(255,255,255,0.08);
}

/* ---------------- CARDS ---------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.card {
  background: linear-gradient(160deg, rgba(15,23,42,0.95), rgba(0,0,0,0.95));
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid rgba(56,189,248,0.15);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: var(--transition);
}

.card h3 {
  margin-top: 0;
  color: var(--accent-strong);
}

.card p {
  color: var(--text-light);
  line-height: 1.6;
}

.card:hover {
  transform: translateY(-10px);
  border-color: var(--accent);
  box-shadow: 0 20px 60px rgba(56,189,248,0.25);
}

/* ---------------- SKILLS ---------------- */
.skills-section {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  background: linear-gradient(160deg, rgba(15,23,42,0.95), rgba(0,0,0,0.95));
  border: 1px solid rgba(56,189,248,0.15);
  transition: var(--transition);
  justify-content: center;
}

.skills-section .skill-tag {
  color: #bdbdbd;
  font-weight: 900;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  background: rgba(15,23,42,0.95);
  border: 1px solid rgba(56,189,248,0.15);
  transition: var(--transition);
}

.skills-section .skill-tag:hover {
  background: var(--accent);
  color: #020617;
}

/* ---------------- LINKS ---------------- */
a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover {
  text-shadow: 0 0 10px var(--accent-strong);
}

/* ---------------- ANIMATION ---------------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s forwards;
}

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

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
  }

  /* Centrare hero e sezioni */
  .hero, .cards, .skills-section {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

  /* Navbar hero tags: due a riga se necessario */
  .hero-tags {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  /* Skills: 2 per riga su smartphone */
  .skills-section {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
    justify-items: center;
  }
  
  .skills-section .skill-tag {
    flex: unset;
    max-width: 100%;
    text-align: center;
  }
}