/* ============================================
   TIZIANO INTERLANDI — Personal Site
   Design: Executive dark theme, blue accent
   ============================================ */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-0:       #070c18;
  --bg-1:       #0d1424;
  --bg-2:       #111d35;
  --surface:    #162040;
  --border:     #1e2d50;
  --text-0:     #f0f4ff;
  --text-1:     #a8b8d8;
  --text-2:     #5a7099;
  --accent:     #4f8ef7;
  --accent-h:   #2563eb;
  --accent-2:   #34d399;
  --accent-3:   #f59e0b;
  --radius:     12px;
  --radius-sm:  6px;
  --max-w:      1100px;
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-0);
  color: var(--text-0);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-h); }

img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 100px 0; }

/* ---------- HIDDEN (i18n) ---------- */
[data-lang] { display: none; }
.lang-it [data-lang="it"],
.lang-en [data-lang="en"] { display: revert; }

/* ---------- NAV ---------- */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

#nav.scrolled {
  background: rgba(7, 12, 24, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

#nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-0);
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-1);
  letter-spacing: 0.03em;
}
.nav-links a:hover { color: var(--text-0); }

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 6px;
}

.lang-toggle button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 16px;
  color: var(--text-2);
  transition: all var(--transition);
}

.lang-toggle button.active {
  background: var(--accent);
  color: #fff;
}

/* Mobile menu button */
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-0);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- HERO ---------- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 140px 0 80px;
}

/* Background grid */
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(79, 142, 247, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 142, 247, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 40%, transparent 100%);
  pointer-events: none;
}

/* Glow blobs */
#hero::after {
  content: '';
  position: absolute;
  width: 700px;
  height: 700px;
  top: -200px;
  right: -200px;
  background: radial-gradient(circle, rgba(79,142,247,0.12) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79,142,247,0.1);
  border: 1px solid rgba(79,142,247,0.25);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}

.hero-badge[data-lang] { display: none; }
.lang-it .hero-badge[data-lang="it"],
.lang-en .hero-badge[data-lang="en"] { display: inline-flex; }

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.4); }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
  max-width: 780px;
}

.hero-title .accent { color: var(--accent); }
.hero-title .accent-2 { color: var(--accent-2); }

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-1);
  margin-bottom: 40px;
  max-width: 620px;
  line-height: 1.6;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 70px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary:hover {
  background: var(--accent-h);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(79,142,247,0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-0);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Hero stats */
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat-item { }
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-0);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-number span { color: var(--accent); }
.stat-label {
  font-size: 0.8rem;
  color: var(--text-2);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ---------- SECTION HEADERS ---------- */
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-1);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 56px;
}

/* ---------- ABOUT ---------- */
#about { background: var(--bg-1); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-photo-wrap {
  position: relative;
}

.about-photo-placeholder {
  width: 100%;
  aspect-ratio: 4/5;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-2);
  font-size: 0.85rem;
}

.about-photo-placeholder svg {
  width: 64px;
  height: 64px;
  color: var(--border);
}

.about-photo-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: radial-gradient(ellipse at bottom, var(--bg-2) 0%, var(--bg-0) 100%);
}

/* Accent corner decoration */
.about-photo-wrap::before {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  bottom: -16px;
  left: -16px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  border-radius: 0 0 0 var(--radius);
  pointer-events: none;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-1);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-text p strong { color: var(--text-0); font-weight: 600; }

.about-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-1);
}

/* ---------- EXPERTISE ---------- */
#expertise { background: var(--bg-0); }

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.expertise-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}

.expertise-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.expertise-card.featured {
  border-color: rgba(79,142,247,0.4);
  background: linear-gradient(135deg, var(--bg-2) 0%, var(--bg-1) 100%);
}

.expertise-card.featured::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.icon-blue  { background: rgba(79,142,247,0.12); color: var(--accent); }
.icon-green { background: rgba(52,211,153,0.12);  color: var(--accent-2); }
.icon-amber { background: rgba(245,158,11,0.12);  color: var(--accent-3); }

.card-rank {
  position: absolute;
  top: 20px;
  right: 24px;
  font-size: 3rem;
  font-weight: 900;
  color: rgba(255,255,255,0.03);
  line-height: 1;
  user-select: none;
}

.expertise-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.expertise-card p {
  font-size: 0.9rem;
  color: var(--text-1);
  line-height: 1.7;
  margin-bottom: 24px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255,255,255,0.05);
  color: var(--text-1);
}

/* ---------- EXPERIENCE ---------- */
#experience { background: var(--bg-1); }

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-1);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.2);
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.timeline-period {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.timeline-company {
  font-size: 0.82rem;
  color: var(--text-2);
  font-weight: 500;
}

.timeline-role {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-0);
  margin-bottom: 10px;
}

.timeline-desc {
  font-size: 0.92rem;
  color: var(--text-1);
  line-height: 1.7;
  max-width: 680px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.timeline-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
}

/* ---------- SPEAKING ---------- */
#speaking { background: var(--bg-0); }

.speaking-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.speaking-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition);
}

.speaking-card:hover { border-color: var(--accent); }

.speaking-type {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 10px;
}

.speaking-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.speaking-card p {
  font-size: 0.87rem;
  color: var(--text-1);
  line-height: 1.6;
}

/* ---------- CERTIFICATIONS ---------- */
#certifications { background: var(--bg-1); }

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.cert-card {
  background: var(--bg-0);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color var(--transition);
}
.cert-card:hover { border-color: var(--accent); }

.cert-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: rgba(79,142,247,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.cert-body { }
.cert-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-0);
  line-height: 1.3;
}
.cert-org {
  font-size: 0.78rem;
  color: var(--text-2);
  margin-top: 2px;
}

/* ---------- CONTACT ---------- */
#contact { background: var(--bg-0); }

.contact-inner {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.contact-inner .section-title { margin-bottom: 16px; }
.contact-inner .section-desc { margin: 0 auto 40px; }

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-0);
  transition: all var(--transition);
}
.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.contact-link svg { width: 18px; height: 18px; }

/* ---------- FOOTER ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-2);
  font-size: 0.82rem;
}

/* ---------- SCROLL ANIMATIONS ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Stagger delays */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  .expertise-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .about-photo-wrap { max-width: 320px; }
}

@media (max-width: 720px) {
  section { padding: 72px 0; }

  .nav-links {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--bg-0);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.2rem; }
  .nav-burger { display: flex; }

  .hero-stats { gap: 24px; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .cert-grid { grid-template-columns: 1fr; }
  .hero-ctas { flex-direction: column; }
}

.timeline-container{
display:grid;
grid-template-columns:1fr 1fr;
gap:60px;
}

.timeline-left{
border-right:1px solid #222;
padding-right:40px;
}

.timeline-right{
padding-left:40px;
}