:root {
  --color-bg: #f4f6f9;
  --color-text: #333;
  --color-header-gradient-start: #6a11cb;
  --color-header-gradient-end: #2575fc;
  --color-header-text: #fff;
  --color-h2: #222;
  --color-h2-underline: #2575fc;
  --color-card-bg: #fff;
  --color-card-title: #2575fc;
  --color-card-span: #777;
  --color-skills-bg: #2575fc;
  --color-skills-text: #fff;
  --color-certs-bg: #fff;
  --color-certs-shadow: rgba(0, 0, 0, 0.05);
  --color-footer-bg: #222;
  --color-footer-text: #fff;
  --color-card-shadow: rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* Hero */
header {
  background: url("toon_pc_2.png") no-repeat center/cover; /* immagine di sfondo */
  position: relative;
  color: #fff;
  text-align: center;
  padding: 5rem 1rem;
  border-bottom-left-radius: 40px;
  border-bottom-right-radius: 40px;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(38, 38, 38, 0.55); /* overlay scuro trasparente */
  z-index: 0;
}

.hero {
  position: relative;
  z-index: 1;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  opacity: 0.9;
}

.contacts a {
  font-size: 1.6rem;
  margin: 0 0.5rem;
  text-decoration: none;
  transition: transform 0.3s, opacity 0.3s;
}
.contacts a:hover {
  transform: scale(2) translateY(-5px);
  opacity: 0.8;
}

/* Sections */
.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
  padding: 2rem 0;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  position: relative;
  color: var(--color-h2);
}

h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-h2-underline);
  margin-top: 0.5rem;
  border-radius: 2px;
}

/* Cards */
.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--color-card-bg);
  border-radius: 15px;
  padding: 1.5rem;
  box-shadow: 0 8px 20px var(--color-card-shadow);
  transition: transform 0.3s;
}
.card:hover {
  transform: translateY(-5px);
}

.card h3 {
  color: var(--color-card-title);
  margin-bottom: 0.5rem;
}

.card span {
  font-size: 0.9rem;
  color: var(--color-card-span);
}

/* Skills */
.skills {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.skills span {
  background: var(--color-skills-bg);
  color: var(--color-skills-text);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
}

/* Certifications */
.certs {
  list-style: none;
  margin-top: 1rem;
}
.certs li {
  background: var(--color-certs-bg);
  margin-bottom: 0.7rem;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  box-shadow: 0 4px 10px var(--color-certs-shadow);
  font-size: 0.95rem;
}

/* Footer */
footer {
  text-align: center;
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 1rem;
  margin-top: 2rem;
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
}

/* 🔘 Toggle button */
#theme-toggle {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: var(--color-skills-text);
  font-size: 1.3rem;
  padding: 0.5rem 0.8rem;
  border-radius: 50%;
  cursor: pointer;
  margin-top: 1rem;
  transition: background 0.3s, transform 0.3s;
}
#theme-toggle:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(1.1);
}

/* 🌑 Dark mode */
body.dark {
  background: #121212;
  color: #fff;
}

body.dark header {
  color: #fff;
}

body.dark .container section h2 {
  color: var(--color-skills-text);
}

body.dark .card {
  background: #1e1e1e;
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
}

body.dark .card h3 {
  color: #7aa7ff;
}

body.dark .skills span {
  background: #7aa7ff;
  color: #000;
}

body.dark .certs li {
  background: #1e1e1e;
  color: #ddd;
}

body.dark footer {
  background: #000;
  color: #aaa;
}

/* 📱 Mobile view */
@media (max-width: 768px) {
  header {
    padding: 3rem 1rem;
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
    background-position: center top; /* mostra bene l’immagine sul telefono */
  }

  header h1 {
    font-size: 1.8rem;
  }

  .tagline {
    font-size: 1rem;
  }

  .contacts a {
    font-size: 1.2rem;
    margin: 0 0.3rem;
  }

  .container {
    width: 95%;
    padding: 1rem 0;
  }

  h2 {
    font-size: 1.5rem;
  }

  .grid {
    grid-template-columns: 1fr; /* le card diventano a colonna */
  }

  .card {
    padding: 1rem;
  }

  .skills {
    flex-direction: column;
    align-items: flex-start;
  }
  .skills span {
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
  }

  footer {
    font-size: 0.85rem;
    padding: 0.8rem;
  }
}