/* Variabili di base (Dark Mode - Default con accenti Viola Tech Nerd) */
:root {
  --bg: #030712;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-surface: rgba(255, 255, 255, 0.02);
  --border: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(168, 85, 247, 0.35);
  --accent: #a855f7;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius: 16px;
  --grid-opacity: 1;
  --glass-blur: blur(20px) saturate(190%);
}

/* Variabili Light Mode Apple Spec */
[data-theme="light"] {
  --bg: #f1f5f9;
  --glass-bg: rgba(255, 255, 255, 0.4);
  --glass-surface: rgba(255, 255, 255, 0.45);
  --border: rgba(0, 0, 0, 0.06);
  --border-glow: rgba(168, 85, 247, 0.25);
  --text: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --grid-opacity: 0.4;
  --glass-blur: blur(20px) saturate(160%);
}

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

/* L'attributo [hidden] deve sempre vincere su eventuali regole display:flex/grid più specifiche */
[hidden] {
  display: none !important;
}

html, body {
  width: 100%;
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  transition: background-color 0.3s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: color 0.3s ease;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(circle at 50% 30%, black 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 30%, transparent 85%);
  pointer-events: none;
  z-index: 1;
  opacity: var(--grid-opacity);
  transition: opacity 0.3s ease;
}

/* Header iPhone Glassmorphism Spec */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--border);
}

.nav-links {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  padding: 4px;
  border-radius: 99px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="light"] .nav-links {
  background: rgba(0, 0, 0, 0.03);
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 99px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a.active {
  color: #ffffff !important;
  background-color: var(--accent);
  box-shadow: 0 2px 12px rgba(168, 85, 247, 0.35);
}

/* Pulsante Fluttuante Viola */
.theme-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

main {
  position: relative;
  z-index: 2;
  max-width: 1100px;
  margin: 0 auto;
  padding: 140px 24px 100px;
}

section {
  padding: 80px 0 40px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-label::after {
  content: "";
  height: 1px;
  width: 40px;
  background-color: var(--border-glow);
  display: inline-block;
}

h1 {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 28px;
  color: var(--text);
}

h2 {
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 40px;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.hero-lead {
  font-size: clamp(16px, 2vw, 18px);
  color: var(--text-muted);
  margin-bottom: 40px;
  font-weight: 400;
}

.cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
  background-color: var(--text);
  color: var(--bg);
  border: 1px solid var(--text);
}

.btn-primary:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.btn-secondary {
  background-color: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--border);
  border-color: var(--accent);
}

/* Radar Box Glass */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  background: radial-gradient(circle at center, color-mix(in srgb, var(--accent) 8%, transparent) 0%, transparent 70%), var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  padding: 1.5rem 0;
  border-radius: var(--radius);
  max-width: 100%;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.hero-visual svg {
  max-width: 100%;
}

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

/* Interactive Cards Glass */
.interactive-card {
  background-color: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.interactive-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(168, 85, 247, 0.06);
}

.card-icon {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 16px;
}

.interactive-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.interactive-card p {
  color: var(--text-muted);
  font-size: 14px;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* Timeline Items Glass */
.timeline-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 24px;
  background-color: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

.timeline-item:hover {
  border-left-color: var(--accent);
  border-color: var(--border-glow);
  background-color: color-mix(in srgb, var(--accent) 2%, var(--glass-surface));
}

/* Stile specifico per evidenziare l'esperienza attuale */
.timeline-item.current {
  border-left-color: var(--accent);
  border-color: rgba(168, 85, 247, 0.25);
  background-color: color-mix(in srgb, var(--accent) 1.5%, var(--glass-surface));
}

.time-frame {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.job-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.company {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 16px;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 11px;
  background: rgba(0, 0, 0, 0.15);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

[data-theme="light"] .tag {
  background: rgba(255, 255, 255, 0.5);
}

.skills-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

/* Skill Cards Glass */
.skill-category {
  background-color: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.3s ease;
}

.skill-category:hover {
  border-color: var(--border-glow);
}

.skill-category h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

/* Contact Block Glass */
.contact-block {
  background: radial-gradient(circle at center, color-mix(in srgb, var(--accent) 5%, transparent) 0%, transparent 80%), var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
}

.contact-block h2 {
  margin-bottom: 16px;
}

.contact-block p {
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 32px;
}

footer {
  padding: 60px 24px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 2;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
}

@media (max-width: 900px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  main { padding-top: 135px; }
  section { padding: 50px 0 20px; }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }
  .nav-container {
    flex-direction: column;
    gap: 10px;
    padding: 12px 16px;
    align-items: center;
  }
  .nav-links {
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    display: flex;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    background: transparent;
    border: none;
    padding: 0;
  }
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  .nav-links a {
    padding: 6px 12px;
    font-size: 12px;
    flex-shrink: 0;
  }
}