:root {
  --bg:       #0d1117;
  --bg2:      #161b22;
  --bg3:      #1f2937;
  --border:   rgba(255,255,255,.08);
  --border-h: rgba(16,185,129,.45);
  --text:     #e6edf3;
  --muted:    #8b949e;
  --accent:   #10b981;
  --accent2:  #06b6d4;
  --accent3:  #3b82f6;
  --warn:     #f59e0b;
  --danger:   #ef4444;
  --radius:   14px;
  --shadow:   0 10px 40px rgba(0,0,0,.45);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, system-ui, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  line-height: 1.55;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 40% at 20% 10%, rgba(16,185,129,.10), transparent 60%),
    radial-gradient(ellipse 40% 35% at 80% 90%, rgba(59,130,246,.08), transparent 60%);
  pointer-events: none;
  z-index: -1;
}
a { color: var(--accent2); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent); }

/* ── Header ──────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.site-header .logo { height: 50px; }

.site-header-tagline {
  margin-left: auto;
  color: var(--muted);
  font-size: .85rem;
}

/* Top nav (stile Google) */
.top-nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
  font-size: .84rem;
}
.top-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 4px 2px;
  transition: color .15s;
}
.top-nav a:hover { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }

.ads-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(16,185,129,.08);
  border: 1px solid rgba(16,185,129,.25);
  border-radius: 999px;
  color: var(--accent) !important;
  font-weight: 600;
  font-size: .82rem;
  transition: all .15s;
  text-decoration: none;
  white-space: nowrap;
}
.ads-link:hover {
  background: rgba(16,185,129,.15);
  border-color: rgba(16,185,129,.5);
  transform: translateY(-1px);
}

@media (max-width: 760px) {
  .top-nav { gap: 10px; font-size: .76rem; order: 3; width: 100%; margin-top: 8px; margin-left: 0; justify-content: center; flex-wrap: wrap; }
  .ads-link { margin-left: auto; font-size: 0; padding: 6px 9px; gap: 0; }
  .ads-link::after { content: "Ads"; font-size: .76rem; font-weight: 600; }
}

/* ── Hero ────────────────────────────────────────── */
.hero {
  max-width: 960px;
  margin: 40px auto 24px;
  padding: 0 24px;
  text-align: center;
}
.hero h1 {
  font-size: 2rem;
  margin: 0 0 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 620px;
  margin: 0 auto;
}

/* ── Tabs ────────────────────────────────────────── */
.tabs {
  max-width: 960px;
  margin: 30px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: transparent;
  border: 0;
  color: var(--muted);
  font-family: inherit;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .15s, border-color .15s;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab svg { width: 16px; height: 16px; opacity: .85; }

/* ── Layout calcolatrice ─────────────────────────── */
.calc-wrap {
  max-width: 960px;
  margin: 30px auto 60px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.panel {
  display: none;
}
.panel.active { display: contents; }

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}

.card.card-input { border-left: 3px solid var(--accent2); }
.card.card-output { border-left: 3px solid var(--accent); }

/* ── Form ────────────────────────────────────────── */
.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }
.field label {
  display: block;
  margin-bottom: 5px;
  color: var(--text);
  font-size: .88rem;
  font-weight: 500;
}
.field .hint {
  display: block;
  font-size: .76rem;
  color: var(--muted);
  margin-top: 4px;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-wrap input[type="number"],
.input-wrap input[type="text"],
.input-wrap select {
  width: 100%;
  padding: 12px 14px;
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color .15s, background .15s;
  font-variant-numeric: tabular-nums;
}
.input-wrap input:focus,
.input-wrap select:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(16,185,129,.05);
}
.input-wrap .suffix {
  position: absolute;
  right: 12px;
  color: var(--muted);
  font-weight: 600;
  pointer-events: none;
  font-size: .9rem;
}
.input-wrap input[type="number"] { padding-right: 36px; }

.radio-group {
  display: flex;
  gap: 6px;
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
}
.radio-group label {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 9px 10px;
  margin: 0;
  border-radius: 7px;
  cursor: pointer;
  color: var(--muted);
  font-weight: 600;
  font-size: .85rem;
  transition: background .15s, color .15s;
}
.radio-group input[type="radio"] { display: none; }
.radio-group input[type="radio"]:checked + label {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #052e23;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(0,0,0,.3);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-size: .9rem;
  user-select: none;
  transition: border-color .15s, background .15s;
}
.checkbox-row:hover { border-color: var(--border-h); }
.checkbox-row input[type="checkbox"] {
  width: 18px; height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Output rows ─────────────────────────────────── */
.out-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-variant-numeric: tabular-nums;
}
.out-row:last-child { border-bottom: 0; }
.out-row .label { color: var(--muted); font-size: .92rem; }
.out-row .value { color: var(--text); font-weight: 600; font-size: 1rem; }
.out-row.sub .value { color: var(--accent2); }
.out-row.minus .value { color: #f87171; }
.out-row.plus .value { color: var(--accent); }

.out-row.total {
  margin-top: 14px;
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(16,185,129,.12), rgba(6,182,212,.08));
  border: 1px solid rgba(16,185,129,.3);
  border-radius: 12px;
}
.out-row.total .label {
  color: var(--text);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-size: .82rem;
}
.out-row.total .value {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* ── Note box ────────────────────────────────────── */
.note {
  margin-top: 14px;
  padding: 12px 16px;
  background: rgba(245,158,11,.08);
  border: 1px solid rgba(245,158,11,.22);
  border-radius: 10px;
  color: #fbbf24;
  font-size: .85rem;
  line-height: 1.55;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.note svg { flex-shrink: 0; margin-top: 2px; }

/* ── Actions ─────────────────────────────────────── */
.actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: .88rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  transition: filter .15s, transform .1s, border-color .15s;
}
.btn:hover { filter: brightness(1.15); border-color: var(--border-h); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #052e23;
  border-color: transparent;
}

/* ── Footer ──────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.7;
}
.site-footer a { color: var(--muted); text-decoration: underline; }
.site-footer a:hover { color: var(--text); }
.site-footer .sep { margin: 0 6px; opacity: .4; }
.site-footer-nav { margin-bottom: 10px; }
.site-footer-nav a { font-weight: 500; text-decoration: none; padding: 2px 4px; }
.site-footer-nav a:hover { text-decoration: underline; text-underline-offset: 3px; }
.site-footer .piva { font-size: .76rem; opacity: .6; letter-spacing: .02em; margin-top: 4px; }

.visits-strip {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  max-width: fit-content;
  margin: 0 auto 30px;
  padding: 5px 14px;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .72rem;
  color: var(--muted);
  letter-spacing: .02em;
}
.visits-strip .fv-item { display: inline-flex; align-items: center; gap: 5px; }
.visits-strip .fv-item svg { opacity: .7; }
.visits-strip .fv-sep { opacity: .35; }
.site-footer .disclaimer {
  max-width: 720px;
  margin: 10px auto 0;
  font-size: .78rem;
  opacity: .75;
}

/* ── Pagine statiche (chi-siamo / privacy / ecc.) ── */
.static-page {
  max-width: 780px;
  margin: 40px auto 60px;
  padding: 0 24px;
  color: var(--text);
  line-height: 1.7;
}
.static-page h1 {
  font-size: 2rem;
  margin: 0 0 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.static-page h2 {
  font-size: 1.2rem;
  margin: 32px 0 10px;
  color: var(--text);
  border-left: 3px solid var(--accent);
  padding-left: 12px;
}
.static-page p { color: #c5cdd5; margin: 0 0 14px; }
.static-page .static-lead { font-size: 1.05rem; color: var(--text); margin-bottom: 22px; }
.static-page ul { padding-left: 20px; margin: 10px 0 18px; color: #c5cdd5; }
.static-page li { margin-bottom: 8px; }
.static-page a { color: var(--accent2); }
.static-page a:hover { color: var(--accent); }
.static-page code {
  background: rgba(0,0,0,.35);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .88em;
}
.static-page .static-back {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: .9rem;
}

.avv-hero {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 22px 24px;
  background: linear-gradient(135deg, rgba(245,158,11,.12), rgba(239,68,68,.06));
  border: 1px solid rgba(245,158,11,.25);
  border-left: 4px solid #fbbf24;
  border-radius: var(--radius);
  margin-bottom: 22px;
}
.avv-hero-icon { font-size: 2.5rem; line-height: 1; flex-shrink: 0; }
.avv-warning {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 20px;
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: var(--radius);
  color: #fca5a5;
  margin: 24px 0;
}
.avv-warning svg { color: #f87171; flex-shrink: 0; margin-top: 2px; }
.avv-warning strong { color: #f87171; display: block; margin-bottom: 6px; font-size: 1.05rem; }
.avv-warning p { margin: 0; color: #fecaca; line-height: 1.65; font-size: .95rem; }

.pub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin: 18px 0 24px;
}
.pub-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 14px;
  padding: 18px;
  transition: transform .15s, box-shadow .2s, border-color .15s;
}
.pub-card:hover { transform: translateY(-3px); border-color: var(--border-h); box-shadow: 0 12px 28px rgba(0,0,0,.4); }
.pub-card:nth-child(2n) { border-top-color: var(--accent2); }
.pub-card:nth-child(3n) { border-top-color: var(--accent3); }
.pub-card:nth-child(4n) { border-top-color: #a855f7; }
.pub-card:nth-child(5n) { border-top-color: #f59e0b; }
.pub-card:nth-child(6n) { border-top-color: #ec4899; }
.pub-card-icon { font-size: 2rem; line-height: 1; margin-bottom: 4px; }
.pub-card h3 { margin: 0 0 2px; font-size: 1rem; font-weight: 700; color: var(--text); }
.pub-card p  { margin: 0; color: var(--muted); font-size: .85rem; line-height: 1.55; }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 760px) {
  .site-header { padding: 14px 16px; flex-wrap: wrap; }
  .site-header .logo { height: 40px; }
  .site-header-tagline { display: none; }
  .hero { margin-top: 24px; padding: 0 16px; }
  .hero h1 { font-size: 1.5rem; }
  .tabs { padding: 0 16px; }
  .tab { padding: 12px 14px; font-size: .88rem; }
  .calc-wrap {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 16px;
  }
  .card { padding: 20px; }
  .out-row.total .value { font-size: 1.3rem; }
}