:root {
  --bg: #f7f7f5; --card: #ffffff; --text: #1d1d1f; --muted: #6b6b70; --line: #e3e3e0;
  --accent: #1f5fbf; --accent-soft: #e8f0fb; --on-accent: #ffffff; --ok: #1d7a46; --ok-soft: #e6f4ec; --bad: #b3261e; --bad-soft: #fbeaea;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416; --card: #1d1d20; --text: #ececee; --muted: #a0a0a6; --line: #2e2e33;
    --accent: #6ea2f0; --accent-soft: #1d2a3d; --on-accent: #0d1b2e; --ok: #5cc28a; --ok-soft: #17291f; --bad: #f08a83; --bad-soft: #2e1918;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
code { background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; font-size: .92em; }

.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; max-width: 920px; margin: 0 auto; padding: 16px; }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.top nav { display: flex; gap: 14px; font-size: .95rem; }
.top nav a { text-decoration: none; }

main { max-width: 920px; margin: 0 auto; padding: 0 16px 48px; }
.hero h1 { font-size: clamp(1.7rem, 4.5vw, 2.4rem); line-height: 1.15; margin: 16px 0 8px; }
.lead { color: var(--muted); margin: 0 0 20px; max-width: 680px; }

.drop { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; padding: 40px 16px;
  background: var(--card); border: 2px dashed var(--line); border-radius: var(--radius); cursor: pointer; text-align: center;
  transition: border-color .15s, background .15s; }
.drop:hover, .drop:focus, .drop.over { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.drop-icon { font-size: 2.2rem; }
.drop-title { font-weight: 600; font-size: 1.1rem; }
.drop-sub { color: var(--muted); font-size: .95rem; }
.privacy { color: var(--muted); font-size: .9rem; margin: 10px 0 0; }

.result { margin-top: 28px; display: grid; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.card h2 { font-size: 1.1rem; margin: 0 0 10px; }
.file-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; }
.file-name { font-weight: 600; word-break: break-all; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--text); font: inherit; text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
.signer { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 0; }
.signer dt { color: var(--muted); }
.signer dd { margin: 0; word-break: break-word; }
.signer + .signer { border-top: 1px solid var(--line); margin-top: 12px; padding-top: 12px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: .9rem; font-weight: 600; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.note { color: var(--muted); font-size: .88rem; margin: 10px 0 0; }
.error { background: var(--bad-soft); color: var(--bad); border-radius: var(--radius); padding: 14px 18px; }
.preview iframe { width: 100%; height: 75vh; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.preview img { max-width: 100%; border-radius: 10px; }

.fattura-doc { color: var(--text); }
.fattura-doc + .fattura-doc { border-top: 2px solid var(--line); margin-top: 20px; padding-top: 20px; }
.fattura-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.fattura-head h2 { margin: 0; }
.fattura-head p { margin: 2px 0 0; color: var(--muted); }
.fattura-totale { text-align: right; }
.fattura-totale span { display: block; color: var(--muted); font-size: .9rem; }
.fattura-totale strong { font-size: 1.4rem; }
.fattura-parti { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 16px 0; }
.fattura-parti h3, .fattura-doc h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 0 0 4px; }
.fattura-parti p { margin: 0; }
.fattura-doc table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: .95rem; }
.fattura-doc th, .fattura-doc td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
.fattura-doc .num { text-align: right; white-space: nowrap; }
.fattura-righe-wrap { overflow-x: auto; }

.faq { margin-top: 48px; }
.faq h2 { font-size: 1.4rem; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 8px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; color: var(--muted); }
.foot { max-width: 920px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); }

@media print {
  body.print-fattura * { visibility: hidden; }
  body.print-fattura .fattura-print, body.print-fattura .fattura-print * { visibility: visible; }
  body.print-fattura .fattura-print { position: absolute; inset: 0; border: 0; padding: 0; }
  :root { --text: #000; --muted: #444; --line: #ccc; --card: #fff; }
}

.mail-html { width: 100%; min-height: 220px; height: 40vh; border: 1px solid var(--line); border-radius: 10px; background: #fff; margin-top: 12px; }
.mail-text { white-space: pre-wrap; background: var(--bg); border-radius: 10px; padding: 12px; margin: 12px 0 0; font: inherit; }
.att { list-style: none; padding: 0; margin: 0; }
.att li { padding: 8px 0; border-bottom: 1px solid var(--line); word-break: break-all; }
.att li:last-child { border-bottom: 0; }
.btn-link { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; }

.content { margin-top: 40px; max-width: 760px; }
.content h2 { font-size: 1.3rem; margin: 28px 0 8px; }
.content p, .content li { color: var(--text); }
.content ol, .content ul { padding-left: 22px; }
.content li { margin: 4px 0; }
.related { margin-top: 32px; }
.related h2 { font-size: 1.2rem; }
.related ul { list-style: none; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.related a { display: block; padding: 12px 14px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; text-decoration: none; }

.brand { display: inline-flex; align-items: center; gap: 8px; }
.brand img { display: block; }