:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1c2130;
  --muted: #5b6475;
  --border: #dde1e8;
  --accent: #2357d1;
  --accent-hover: #1c47ad;
  --accent-text: #ffffff;
  --viewer-bg: #e4e7ec;
  --ok: #18794a;
  --ok-bg: #e5f4ec;
  --warn: #8f5a00;
  --warn-bg: #fdf1dc;
  --bad: #c0281b;
  --bad-bg: #fde8e6;
  --shadow: 0 1px 2px rgb(16 24 40 / 0.06), 0 4px 16px rgb(16 24 40 / 0.08);
  --radius: 10px;
  --toolbar-h: 52px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1d22;
    --surface: #24272e;
    --surface-2: #2c3038;
    --text: #e7e9ee;
    --muted: #a2a9b7;
    --border: #383c46;
    --accent: #7ea3ff;
    --accent-hover: #9bb8ff;
    --accent-text: #0f1630;
    --viewer-bg: #2f333b;
    --ok: #5fd39a;
    --ok-bg: #173527;
    --warn: #f2bd5c;
    --warn-bg: #3a2d14;
    --bad: #ff8a7d;
    --bad-bg: #401c19;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 6px 20px rgb(0 0 0 / 0.35);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

[hidden] { display: none !important; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.icon {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon.muted { color: var(--muted); }

/* ------------------------------------------------------------ Pulsanti */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover:not(:disabled) { background: var(--surface-2); }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn:focus-visible, select:focus-visible, input:focus-visible, .sig-chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.subtle { border-color: transparent; background: transparent; color: var(--accent); }
.btn.big { min-height: 46px; padding: 0 22px; font-size: 16px; border-radius: 10px; }
.btn.icon-only { width: 36px; padding: 0; border-color: transparent; background: transparent; }
.btn.icon-only:hover:not(:disabled) { background: var(--surface-2); }

/* ------------------------------------------------------------ Toolbar */

.toolbar {
  position: relative;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  min-height: var(--toolbar-h);
  padding: 8px max(12px, env(safe-area-inset-right)) 8px max(12px, env(safe-area-inset-left));
  padding-top: max(8px, env(safe-area-inset-top));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.tb-group { display: flex; align-items: center; gap: 8px; min-width: 0; }
.tb-file { flex: 1 1 200px; }
.tb-view { gap: 14px; }
.tb-cluster { display: flex; align-items: center; gap: 2px; }
.tb-actions { margin-left: auto; }

.doc-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 600;
}

.page-box { display: flex; align-items: center; gap: 6px; color: var(--muted); font-variant-numeric: tabular-nums; }
.page-box input {
  width: 3.4em;
  height: 32px;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  text-align: center;
  -moz-appearance: textfield;
}
.page-box input::-webkit-outer-spin-button,
.page-box input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

#zoomSelect {
  height: 32px;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.sig-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  max-width: 280px;
  min-height: 30px;
  padding: 0 10px 0 8px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.sig-chip .icon { width: 18px; height: 18px; }
.sig-chip-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sig-chip.valid { background: var(--ok-bg); color: var(--ok); }
.sig-chip.invalid { background: var(--bad-bg); color: var(--bad); }
.sig-chip.unknown { background: var(--warn-bg); color: var(--warn); }

/* ------------------------------------------------------------ Ricerca */

.findbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 15;
}
.findbar input {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 420px;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.find-result { color: var(--muted); font-size: 13px; white-space: nowrap; }
.find-result.not-found { color: var(--bad); }

/* ------------------------------------------------------------ Area principale */

main {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  background: var(--viewer-bg);
}

.viewer-container {
  position: absolute;
  inset: 0;
  overflow: auto;
  outline: none;
}
.pdfViewer { padding: 6px 0 16px; }
/* Ombra della pagina: il bordo di PDF.js è trasparente, quindi la disegniamo all'interno. */
.pdfViewer .page::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.2), 0 4px 14px rgb(0 0 0 / 0.08);
}

.welcome {
  position: absolute;
  inset: 0;
  overflow: auto;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: var(--bg);
}
.drop-card {
  width: min(560px, 100%);
  padding: 36px 32px 28px;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--surface);
  text-align: center;
  transition: border-color 0.15s, background-color 0.15s;
}
body.dragging .drop-card { border-color: var(--accent); }
.drop-icon {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin-bottom: 8px;
  border-radius: 16px;
  background: var(--surface-2);
  color: var(--accent);
}
.drop-icon .icon { width: 32px; height: 32px; stroke-width: 1.6; }
.drop-card h1 { margin: 4px 0 6px; font-size: 24px; letter-spacing: -0.01em; }
.drop-hint { margin: 0 0 14px; color: var(--muted); }
.formats { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
.features {
  margin: 24px 0 8px;
  padding: 20px 0 0;
  border-top: 1px solid var(--border);
  list-style: none;
  text-align: left;
  display: grid;
  gap: 12px;
}
.features li { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; color: var(--muted); }
.features li strong { color: var(--text); }
.features .icon { margin-top: 1px; color: var(--accent); }

/* ------------------------------------------------------------ Vista alternativa */

.alt-view {
  position: absolute;
  inset: 0;
  overflow: auto;
  padding: 20px 12px 32px;
}
.sheet {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 28px;
  background: #fff;
  color: #1c2130;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.18), 0 6px 18px rgb(0 0 0 / 0.08);
}
.sheet-note {
  max-width: 900px;
  margin: 0 auto 12px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
}
.text-view {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 13px/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
.text-view.prose { font: 15px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.image-view { display: block; max-width: 100%; height: auto; margin: 0 auto; background: #fff; box-shadow: 0 1px 3px rgb(0 0 0 / 0.18); }
.message-card {
  max-width: 520px;
  margin: 8vh auto 0;
  padding: 28px;
  border-radius: 14px;
  background: var(--surface);
  text-align: center;
  box-shadow: var(--shadow);
}
.message-card h2 { margin: 6px 0 8px; font-size: 19px; }
.message-card p { margin: 0 0 18px; color: var(--muted); }
.message-card .icon.big { width: 40px; height: 40px; color: var(--accent); stroke-width: 1.6; }
.message-card .actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

/* ------------------------------------------------------------ Pannello firme */

.sig-panel {
  position: absolute;
  z-index: 10;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow);
  animation: slide-in 0.18s ease-out;
}
@keyframes slide-in { from { transform: translateX(24px); opacity: 0; } }
.sig-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 12px 12px 18px;
  border-bottom: 1px solid var(--border);
}
.sig-panel-head h2 { margin: 0; font-size: 17px; }
.sig-panel-body { flex: 1; overflow: auto; padding: 16px 18px max(24px, env(safe-area-inset-bottom)); }

.summary {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  border-radius: var(--radius);
  margin-bottom: 18px;
}
.summary .icon { width: 26px; height: 26px; }
.summary h3 { margin: 0 0 2px; font-size: 15px; }
.summary p { margin: 0; font-size: 14px; }
.summary.valid { background: var(--ok-bg); color: var(--ok); }
.summary.invalid { background: var(--bad-bg); color: var(--bad); }
.summary.unknown { background: var(--warn-bg); color: var(--warn); }
.summary p { color: var(--text); }

.layer-title {
  margin: 20px 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.signer {
  margin-bottom: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.signer-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.signer-name { margin: 0; font-size: 16px; font-weight: 650; overflow-wrap: anywhere; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: none;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
}
.badge .icon { width: 14px; height: 14px; }
.badge.valid { background: var(--ok-bg); color: var(--ok); }
.badge.invalid { background: var(--bad-bg); color: var(--bad); }
.badge.unknown { background: var(--warn-bg); color: var(--warn); }
.signer-msg { margin: 6px 0 10px; font-size: 13px; color: var(--muted); }
.facts { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; margin: 0; font-size: 13.5px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.facts .warn { color: var(--warn); }
.facts .bad { color: var(--bad); }
.facts .ok { color: var(--ok); }
.signer details { margin-top: 10px; font-size: 12.5px; color: var(--muted); }
.signer summary { cursor: pointer; color: var(--accent); }
.signer details p { margin: 6px 0 0; overflow-wrap: anywhere; }
.stamp {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13.5px;
}
.stamp .icon { color: var(--muted); margin-top: 1px; }
.stamp-main { flex: 1; min-width: 0; }
.stamp-main strong { display: block; }
.stamp-main span { color: var(--muted); }
.disclaimer {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--muted);
}

/* ------------------------------------------------------------ Finestre e avvisi */

.modal {
  width: min(380px, calc(100% - 32px));
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}
.modal::backdrop { background: rgb(10 14 24 / 0.45); }
.modal h2 { display: flex; align-items: center; gap: 8px; margin: 0 0 6px; font-size: 18px; }
.modal p { margin: 0 0 14px; color: var(--muted); font-size: 14px; }
.modal p.error { color: var(--bad); }
.modal input {
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }

.busy {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  background: rgb(10 14 24 / 0.25);
}
.busy-card {
  display: grid;
  justify-items: center;
  gap: 12px;
  min-width: 240px;
  max-width: calc(100% - 32px);
  padding: 22px 26px;
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.busy-card p { margin: 0; text-align: center; }
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress { width: 100%; height: 6px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.progress-bar { width: 0; height: 100%; background: var(--accent); transition: width 0.15s; }

.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  place-items: center;
  background: rgb(35 87 209 / 0.12);
  border: 3px dashed var(--accent);
  pointer-events: none;
}
.drop-overlay > div { padding: 24px 32px; border-radius: 14px; background: var(--surface); text-align: center; box-shadow: var(--shadow); }
.drop-overlay .icon { width: 36px; height: 36px; color: var(--accent); }
.drop-overlay p { margin: 8px 0 0; font-weight: 600; }
body.dragging .drop-overlay { display: grid; }

.toast {
  position: fixed;
  z-index: 70;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100% - 32px);
  padding: 12px 16px;
  border-radius: 10px;
  background: #222733;
  color: #fff;
  font-size: 14px;
  box-shadow: var(--shadow);
}
.toast.error { background: var(--bad); color: #fff; }

#printContainer, #printNotice { display: none; }

/* ------------------------------------------------------------ Schermi piccoli */

@media (max-width: 760px) {
  .toolbar { gap: 6px 8px; padding-left: max(8px, env(safe-area-inset-left)); padding-right: max(8px, env(safe-area-inset-right)); }
  .tb-file { flex: 1 1 0; }
  .tb-view { order: 3; width: 100%; justify-content: space-between; gap: 6px; }
  .btn-label { display: none; }
  #btnOpen, .tb-actions .btn { width: 38px; padding: 0; }
  #zoomSelect { max-width: 118px; }
  .sig-chip { max-width: 46vw; }
  .drop-card { padding: 28px 18px 20px; }
  .sheet { padding: 16px; }
  .sig-panel {
    top: auto;
    width: 100%;
    max-height: 85%;
    border-left: 0;
    border-top: 1px solid var(--border);
    border-radius: 16px 16px 0 0;
    animation-name: slide-up;
  }
  @keyframes slide-up { from { transform: translateY(24px); opacity: 0; } }
}

@media (max-width: 420px) {
  .doc-title { display: none; }
  #zoomSelect { display: none; }
}

/* ------------------------------------------------------------ Stampa */

@media print {
  html, body {
    height: 100% !important;
    overflow: visible !important;
    background: #fff !important;
    display: block !important;
  }
  body > * { display: none !important; }

  body[data-print="pdf"] > #printContainer { display: block !important; height: 100%; }
  #printContainer > .printedPage {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    break-after: page;
    page-break-after: always;
    break-inside: avoid;
    page-break-inside: avoid;
  }
  #printContainer > .printedPage:last-child { break-after: auto; page-break-after: auto; }
  #printContainer img { display: block; max-width: 100%; max-height: 100%; }

  body[data-print="alt"] > #main { display: block !important; position: static; background: none; }
  body[data-print="alt"] #main > :not(#altView) { display: none !important; }
  body[data-print="alt"] .alt-view { position: static; overflow: visible; padding: 0; }
  body[data-print="alt"] .sheet { max-width: none; padding: 0; box-shadow: none; }
  body[data-print="alt"] .sheet-note, body[data-print="alt"] .message-card { display: none !important; }
  body[data-print="alt"] .image-view { max-height: 100vh; object-fit: contain; box-shadow: none; }

  body:not([data-print]) > #printNotice { display: block !important; padding: 2cm; font: 16px system-ui, sans-serif; }
}