/* Project ATLAS - Site #19: Calcolatore di Età Esatta (Italian) */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #8b5cf6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 100% 50%, rgba(139, 92, 246, 0.06) 0%, transparent 40%);
  background-attachment: fixed;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.25rem;
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.brand-icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 1.75rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

/* Hero */
.hero-section {
  padding: 3.5rem 0 2rem;
  text-align: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: 9999px;
  color: #a5b4fc;
  font-size: 0.825rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

/* Tool Main Area */
.tool-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.75rem;
  margin: 2rem 0 4rem;
}

.input-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: 1.25rem;
  padding: 2rem;
  height: fit-content;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  padding: 0.85rem 1rem;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: 0.65rem;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 1rem;
  outline: none;
  transition: all 0.2s ease;
}

.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.btn-primary {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  border-radius: 0.65rem;
  color: white;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

/* Results Display */
.results-area {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.primary-result-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 1.25rem;
  padding: 2.25rem;
  position: relative;
  overflow: hidden;
}

.age-display-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
  text-align: center;
}

.age-unit-val {
  font-family: var(--font-mono);
  font-size: 3.25rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.age-unit-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}

/* Secondary Panels */
.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 1rem;
  padding: 1.25rem;
  transition: all 0.2s ease;
}

.stat-box:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.stat-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}

/* Editorial */
.editorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 1.25rem;
  padding: 2.5rem;
  margin-bottom: 2.5rem;
}

.editorial-card h2 {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: #fff;
}

.editorial-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: #e2e8f0;
}

.editorial-card p {
  color: #cbd5e1;
  margin-bottom: 1.25rem;
  line-height: 1.8;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #0f172a;
  border: 1px solid var(--accent-primary);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  opacity: 0;
  transform: translateY(1rem);
  transition: all 0.3s ease;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  background: #060911;
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2.5rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--accent-primary);
}

@media (max-width: 900px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
  .age-display-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}