:root {
  --bg-color: #030303;
  --card-bg: #0d0d0d;
  --primary-purple: #a78bfa;
  --primary-gradient: linear-gradient(135deg, #6d28d9 0%, #4c1d95 100%);
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --border-color: #1e293b;
  --sidebar-width: 350px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
}

/* =========================
   LAYOUT SYSTEM (MOBILE-FIRST)
   ========================= */

/* Section NON è più un container globale */
section { padding: 5rem 6%; }

/* Container: applicalo in HTML solo alle sezioni normali */
.container {
  max-width: 1400px;
  margin: 0 auto;
}

/* =========================
   SIDEBAR & NAV
   ========================= */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 5%;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(3, 3, 3, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.logo-group { display: flex; align-items: center; gap: 1rem; cursor: pointer; }
.sidebar-toggle { background: none; border: none; color: var(--primary-purple); font-size: 1.8rem; pointer-events: none; }
nav .logo { font-weight: 800; font-size: 1.1rem; color: #fff; }

/* Mobile: nav links hidden (usi sidebar) */
.nav-links { display: none; }

/* Desktop: nav links shown */
@media (min-width: 1024px) {
  .nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
  }
  .nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
  }
}

.sidebar {
  position: fixed;
  top: 0;
  left: calc(var(--sidebar-width) * -1);
  width: var(--sidebar-width);
  height: 100%;
  background: #0a0a0a;
  border-right: 1px solid var(--border-color);
  z-index: 2000;
  transition: 0.4s cubic-bezier(0.77, 0, 0.175, 1);
  padding: 2rem;
  overflow-y: auto;
}

.sidebar.active { left: 0; box-shadow: 20px 0 50px rgba(0,0,0,0.8); }

.overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.7);
  z-index: 1500;
  display: none;
}
.overlay.active { display: block; }

.profile-pic-wrapper {
  width: 120px; height: 120px;
  border-radius: 50%;
  border: 2px solid var(--primary-purple);
  margin: 1rem auto;
  overflow: hidden;
}
.profile-pic { width: 100%; height: 100%; object-fit: cover; }
.sidebar-content h2 { text-align: center; margin-top: 1rem; }
.sidebar-tag {
  color: var(--primary-purple);
  text-align: center;
  font-weight: 800;
  font-size: 0.7rem;
  text-transform: uppercase;
  margin-bottom: 2rem;
}
.bio-section h3 {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 5px;
}
.bio-section p { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 1rem; }

/* SOCIAL GRID */
.social-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.social-links-grid a {
  aspect-ratio: 1;
  background: #151515;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  text-decoration: none;
  transition: 0.3s;
  font-size: 1.2rem;
}
.social-links-grid a:hover {
  border-color: var(--primary-purple);
  color: #fff;
  transform: translateY(-3px);
}

/* =========================
   HERO
   ========================= */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 5%;
  position: relative;
  overflow: hidden;
}

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: clamp(2.6rem, 10vw, 5rem);
  font-weight: 800;
}

.hero .subtitle {
  color: var(--primary-purple);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 5px;
  margin-bottom: 1rem;
  height: 1.2rem;
}

.tagline {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin: 1.6rem auto;
  max-width: 34ch;
}

/* Mobile-first: bottoni in colonna */
.hero-btns {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  align-items: stretch;
  margin-top: 2rem;
}
.hero-btns a { width: 100%; justify-content: center; }

.btn-primary {
  background: var(--primary-gradient);
  color: #fff;
  padding: 16px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  transition: 0.4s;
}

.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(109, 40, 217, 0.3); }

.btn-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: #fff;
  padding: 16px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: 0.3s;
}
.btn-card:hover {
  border-color: var(--primary-purple);
  background: rgba(167, 139, 250, 0.05);
  transform: translateY(-3px);
}

.btn-secondary {
  color: #fff;
  border: 1px solid var(--border-color);
  padding: 14px 28px;
  border-radius: 8px;
  text-decoration: none;
  transition: 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-secondary:hover { border-color: var(--primary-purple); }

.btn-tertiary {
  color: var(--text-dim);
  padding: 14px;
  text-decoration: underline;
  text-underline-offset: 5px;
  font-size: 0.9rem;
}

/* Tablet+: bottoni tornano in riga */
@media (min-width: 768px) {
  .tagline { max-width: 600px; font-size: 1.2rem; margin: 2rem auto; }
  .hero-btns {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.2rem;
    margin-top: 3.5rem;
  }
  .hero-btns a { width: auto; }
}

/* =========================
   TECH TICKER (FULL WIDTH, OUTSIDE CONTAINER)
   ========================= */

/* Nota: la section non è più container globale, ma comunque il ticker deve essere full-bleed */
.tech-ticker{
  padding: 1.2rem 0;

  width: 100%;
  margin: 3rem 0;

  /* breakout full width stabile */
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);

  overflow: hidden;
  background: #080808;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.ticker-wrapper{
  width: 100%;
  overflow: hidden;
}

.ticker-content{
  display: flex;
  flex-wrap: nowrap;
  gap: 3rem;               /* mobile gap */
  width: max-content;
  will-change: transform;
  animation: scrollTicker 28s linear infinite;
}

@media (min-width: 768px) {
  .ticker-content { gap: 5rem; }
}

.ticker-content span{
  font-weight: 800;
  font-size: 0.85rem;
  color: #475569;
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  white-space: nowrap;
}

.ticker-content i{
  color: var(--primary-purple);
  font-size: 1.1rem;
}

@keyframes scrollTicker{
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* =========================
   TYPO / SECTIONS
   ========================= */
.section-label {
  color: var(--primary-purple);
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
  text-align: center;
}

h2 {
  text-align: center;
  font-size: 2rem;      /* mobile */
  margin-bottom: 3rem;  /* mobile */
  font-weight: 800;
}

@media (min-width: 768px) {
  section { padding: 7rem 8%; }
  h2 { font-size: 2.5rem; margin-bottom: 4rem; }
}

@media (min-width: 1024px) {
  section { padding: 8rem 10%; }
}

/* =========================
   GRIDS & CARDS (MOBILE-FIRST)
   ========================= */

/* grid “generica” */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Tablet: 2 colonne se serve */
@media (min-width: 768px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Desktop: auto-fit, come tua logica originale */
@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
}

.card {
  background: var(--card-bg);
  padding: 1.8rem; /* mobile meno “mattone” */
  border-radius: 16px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: 0.3s;
}
@media (min-width: 768px) { .card { padding: 2.5rem; } }
.card:hover { border-color: var(--primary-purple); }

/* Griglie specifiche: 1 col (mobile) -> 2 (tablet) -> 3 (desktop) */
.pillars-grid,
.projects-grid,
.edu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 3rem;
}

@media (min-width: 768px) {
  .pillars-grid,
  .projects-grid,
  .edu-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .pillars-grid,
  .projects-grid,
  .edu-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* =========================
   PILLARS ICONS
   ========================= */

/* La tua HTML usa .pillar-icon, quindi teniamo quello */
.pillar-icon {
  margin-bottom: 1.5rem;
  display: block;
}

.pillar-icon i {
  font-size: 2.5rem;
  color: var(--primary-purple);
  background: none;
  border: none;
  box-shadow: none;
}

/* Queste classi .icon-wrapper esistono solo se le usi in HTML.
   Le lascio, ma non sono “forzate” e non creano conflitti. */
.pillar-card .icon-wrapper {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
}

.pillar-card .icon-wrapper i {
  font-size: 2.2rem;
  color: var(--primary-purple);
  transition: 0.3s;
}

.pillar-card:hover .icon-wrapper i {
  transform: scale(1.1);
  filter: drop-shadow(0 0 8px var(--primary-purple));
}

/* =========================
   CARD EXPANSION
   ========================= */
.card-details { max-height: 0; opacity: 0; overflow: hidden; transition: 0.5s ease; }
.card.expanded .card-details { max-height: 500px; opacity: 1; margin-top: 1.5rem; }
.expand-icon { text-align: center; margin-top: 1.5rem; color: var(--text-dim); transition: 0.3s; }
.card.expanded .expand-icon { transform: rotate(45deg); color: var(--primary-purple); }

.tags { display: flex; gap: 0.5rem; margin-top: 1rem; flex-wrap: wrap; }
.tags span { font-size: 0.7rem; background: #1e293b; padding: 4px 10px; border-radius: 4px; color: var(--primary-purple); font-weight: 700; }

/* --- CERTIFICATIONS SECTION UNIFORMED --- */
.certifications-section {
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.cert-grid {
    display: grid;
    /* Su desktop forza 3 colonne uguali */
    grid-template-columns: repeat(3, 1fr); 
    gap: 2rem;
    margin-top: 3rem;
    width: 100%;
}
/* Responsive: se lo schermo è piccolo (es. cellulare), tornano una sotto l'altra */
@media (max-width: 1024px) {
    .cert-grid {
        grid-template-columns: repeat(2, 1fr); /* 2 colonne su tablet */
    }
}

@media (max-width: 768px) {
    .cert-grid {
        grid-template-columns: 1fr; /* 1 colonna su mobile */
    }
}
.cert-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
}

/* La PL-300 ha il bordo viola come le card "highlight" */
.cert-card.primary-cert {
  border-color: var(--primary-purple);
  background: rgba(167, 139, 250, 0.05);
}

.cert-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.cert-card p {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Bottoni uguali a quelli dei Case Studies */
.cert-card .link-btn {
  margin-top: auto;
  width: fit-content;
}


/* =========================
   CONTACT
   ========================= */
.contact-section {
  max-width: 700px;
  margin: 0 auto;
  padding: 6rem 5%;
}

.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem 1.5rem; /* mobile */
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

@media (min-width: 768px) {
  .contact-card { padding: 2.5rem 3rem; }
}

.contact-header { text-align: center; margin-bottom: 2rem; }

.contact-header h2 {
  font-size: 2rem;
  margin-bottom: 0;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (min-width: 768px) {
  .contact-header h2 { font-size: 2.2rem; }
}

#contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-align: left;
}

.input-group label {
  font-size: 0.65rem;
  text-transform: uppercase;
  color: var(--primary-purple);
  font-weight: 800;
  letter-spacing: 1.5px;
}

input, textarea {
  background: #050505;
  border: 1px solid var(--border-color);
  padding: 14px;
  color: #fff;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  width: 100%;
  transition: 0.3s ease;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--primary-purple);
  background: #080808;
}

.form-footer { display: flex; justify-content: flex-start; margin-top: 0.5rem; }

/* =========================
   BACKGROUND VISUALS
   ========================= */
.glow-blob {
  position: absolute;
  width: 500px;
  height: 500px;
  filter: blur(150px);
  opacity: 0.1;
  z-index: -1;
  pointer-events: none;
}
.blob-1 { background: #6d28d9; top: -10%; left: -5%; }
.blob-2 { background: #1e40af; bottom: -10%; right: 10%; }

/* =========================
   LINKS INSIDE CARDS
   ========================= */
.project-links { margin-top: 1.5rem; }

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-purple);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid rgba(167, 139, 250, 0.2);
  padding: 8px 16px;
  border-radius: 6px;
  transition: 0.3s;
}

.link-btn:hover {
  background: rgba(167, 139, 250, 0.1);
  border-color: var(--primary-purple);
}

/* =========================
   SMALL DEVICES
   ========================= */
@media (max-width: 420px) {
  :root { --sidebar-width: 300px; }
}
/* Language switch buttons */
.lang-switch{
  display: inline-flex;
  gap: 0.4rem;
  margin-left: -0.2rem;
  align-items: center;
}

.lang-btn{
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  padding: 0.35rem 0.55rem;
  border-radius: 8px;
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 0.8px;
  cursor: pointer;
  transition: 0.2s ease;
}

.lang-btn:hover{
  border-color: var(--primary-purple);
  color: #fff;
  transform: translateY(-1px);
}

.lang-btn[aria-pressed="true"]{
  color: #fff;
  border-color: rgba(167,139,250,0.6);
  background: rgba(167,139,250,0.08);
}

/* super-compact on very small screens */
@media (max-width: 420px){
  .lang-switch{ margin-left: 0.5rem; }
  .lang-btn{ padding: 0.3rem 0.45rem; font-size: 0.65rem; }
}