:root {
  --hero-bg-1: #f9fbff;
  --hero-bg-2: #eef6ff;
  --section-bg: #ffffff;
}

html { scroll-behavior: smooth; }
body { padding-bottom: calc(86px + env(safe-area-inset-bottom, 0px)) !important; }

.site-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem 0;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: inherit;
  text-decoration: none;
}
.brand-icon { width: 54px; height: 54px; border-radius: 14px; box-shadow: var(--shadow); }
.brand-copy { display: grid; gap: .05rem; }
.brand-copy strong { font-size: 1.05rem; line-height: 1.1; }
.brand-copy span { font-size: .86rem; color: var(--muted); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
}
.site-nav a:hover { color: var(--accent); }

.hero-section {
  padding: 2rem 0 1.25rem;
  background:
    radial-gradient(circle at 20% 0%, rgba(37,99,235,.12), transparent 34%),
    linear-gradient(180deg, var(--hero-bg-1), var(--hero-bg-2));
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 1.5rem;
  align-items: center;
}

.hero-copy-block h1 {
  margin: .3rem 0 .75rem;
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: .97;
}
.hero-copy-block h1 span {
  display: block;
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: var(--muted);
  margin-top: .45rem;
  font-weight: 600;
}
.hero-lead {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}
.hero-actions-row {
  display: flex;
  gap: .85rem;
  flex-wrap: wrap;
  margin: 1.2rem 0 1rem;
}
.hero-cta { min-width: 210px; }
.hero-link-btn, .card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: .72rem .95rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}
.hero-bullets {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: .45rem;
  color: var(--muted);
}
.hero-visual-card {
  min-height: 320px;
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  display: grid;
  place-items: center;
}
.hero-logo {
  width: min(100%, 640px);
  height: auto;
  display: block;
}

.info-section { padding: 1.4rem 0; }
.alt-section { background: color-mix(in srgb, var(--panel) 40%, var(--bg)); }
.section-heading { margin-bottom: 1rem; }
.section-heading h2 {
  margin: .25rem 0 .35rem;
  font-size: clamp(1.6rem, 4vw, 2.25rem);
}
.section-heading p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  max-width: 75ch;
}

.download-grid, .features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.info-card, .feature-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.05rem;
  box-shadow: var(--shadow);
}
.info-card h3, .feature-card h3 { margin: .1rem 0 .4rem; }
.info-card p, .feature-card p {
  margin: 0 0 .85rem;
  color: var(--muted);
  line-height: 1.6;
}
.download-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  margin-bottom: .8rem;
}
.app-section {
  padding: 1.2rem 0 1.4rem;
}
.app-section-heading { margin-bottom: 1.1rem; }
.app-shell-wrapper { position: relative; }

.site-footer {
  padding: 1rem 0 calc(1.2rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.footer-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-shell p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}
.footer-brand {
  display: inline-flex;
  gap: .75rem;
  align-items: center;
}
.footer-brand strong { display: block; }
.footer-brand span { color: var(--muted); font-size: .9rem; }
.footer-icon { width: 48px; height: 48px; border-radius: 12px; }

@media (max-width: 980px) {
  .hero-grid, .download-grid, .features-grid { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .site-header { position: static; }
  .nav-shell { align-items: flex-start; }
}
@media (max-width: 680px) {
  .site-shell { width: min(100%, calc(100% - 1rem)); }
  .brand-icon { width: 48px; height: 48px; }
  .site-nav { width: 100%; gap: .75rem; }
  .hero-visual-card { min-height: 220px; padding: .9rem; }
  .hero-actions-row > * { flex: 1 1 180px; }
  .footer-shell { align-items: flex-start; }
}

:root {
  color-scheme: light dark;
  --bg: #f3f4f6;
  --panel: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #d1d5db;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #dbeafe;
  --danger: #b91c1c;
  --shadow: 0 12px 35px rgba(17, 24, 39, .08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100%;
  padding-bottom: calc(92px + env(safe-area-inset-bottom));
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

button, select, input { font: inherit; }

button {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .72rem .95rem;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

button:disabled { opacity: .45; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: white; font-weight: 700; }
button.primary:hover:not(:disabled) { background: var(--accent-strong); }
button.secondary { background: var(--accent-soft); border-color: transparent; color: #1e40af; font-weight: 700; }
button.ghost { background: transparent; }

.hidden { display: none !important; }

.app-header {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.25rem 1rem .75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.app-header h1 { margin: .15rem 0; font-size: clamp(1.8rem, 5vw, 2.8rem); }
.app-header p { margin: 0; color: var(--muted); }

.eyebrow {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--muted);
}

.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: .75rem 1rem 2rem;
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  gap: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.controls-panel {
  padding: 1rem;
  align-self: start;
  position: sticky;
  top: .75rem;
}

.open-grid { display: grid; gap: .65rem; }

.file-picker,
.drive-picker {
  width: 100%;
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .95rem 1rem;
  border: 2px dashed var(--border);
  border-radius: 14px;
  cursor: pointer;
  text-align: left;
  background: transparent;
}

.drive-picker { border-style: solid; }
.file-picker:hover, .drive-picker:hover { border-color: var(--accent); }
.file-picker input { display: none; }
.file-icon { font-size: 1.7rem; flex: 0 0 auto; }
.file-picker span:nth-child(2), .drive-picker span:nth-child(2) { min-width: 0; }
.file-picker small, .drive-picker small { display: block; margin-top: .12rem; color: var(--muted); font-size: .78rem; }

.config-note {
  margin-top: .65rem;
  padding: .7rem .8rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.4;
}
.config-note code { color: var(--text); }

.file-info { margin-top: .65rem; font-size: .85rem; color: var(--muted); word-break: break-word; }

.transport-dock {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 1000;
  width: min(760px, calc(100% - 20px));
  transform: translateX(-50%);
  padding: .55rem .6rem calc(.55rem + env(safe-area-inset-bottom));
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: 18px 18px 0 0;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  box-shadow: 0 -10px 30px rgba(17, 24, 39, .18);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.transport {
  display: grid;
  grid-template-columns: .62fr 1.22fr 1fr .92fr .62fr;
  gap: .38rem;
  margin: 0;
  align-items: stretch;
}

.transport button {
  min-width: 0;
  min-height: 52px;
  padding: .55rem .35rem;
  font-weight: 750;
  white-space: nowrap;
}

.transport .transport-main {
  font-size: .92rem;
}

.transport .transport-skip {
  font-size: 1.15rem;
}

.transport #playBtn {
  box-shadow: 0 5px 14px rgba(37, 99, 235, .28);
}

.setting {
  border-top: 1px solid var(--border);
  padding-top: .9rem;
  margin-top: .9rem;
}

.setting label { font-weight: 700; }
.setting-row { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
select, input[type="range"] { width: 100%; margin-top: .55rem; }
select {
  min-height: 44px;
  padding: .55rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

progress { width: 100%; height: 12px; margin-top: .6rem; }
.resume-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }

.status {
  min-height: 2.8rem;
  margin: 1rem 0 0;
  padding: .8rem;
  border-radius: 12px;
  background: var(--bg);
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.45;
}

.status.error { color: var(--danger); }
.help { margin-top: .8rem; color: var(--muted); font-size: .9rem; }
.help summary { cursor: pointer; color: var(--text); font-weight: 700; }
.help p { line-height: 1.45; }

.reader-panel { overflow: hidden; }
.reader-toolbar {
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.reader-toolbar h2 { margin: .15rem 0 0; font-size: 1.05rem; overflow-wrap: anywhere; }

.reader {
  min-height: 65vh;
  max-height: calc(100vh - 190px);
  overflow: auto;
  padding: 1.1rem;
  scroll-behavior: smooth;
}
.reader.empty { display: grid; place-items: center; }

.empty-state { text-align: center; color: var(--muted); max-width: 380px; }
.empty-state h3 { color: var(--text); }
.empty-icon { font-size: 2.8rem; }

.page-marker {
  margin: 1.1rem 0 .55rem;
  padding-top: .7rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .08em;
}
.page-marker:first-child { margin-top: 0; border-top: 0; padding-top: 0; }

.paragraph {
  margin: 0 0 .85rem;
  padding: .72rem .8rem;
  border-radius: 10px;
  line-height: 1.65;
  font-size: 1.04rem;
  cursor: pointer;
  border: 1px solid transparent;
}
.paragraph:hover { border-color: var(--border); }
.paragraph.current {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
.paragraph.read { opacity: .72; }

@media (max-width: 820px) {
  .app-header { align-items: flex-start; }
  .layout { grid-template-columns: 1fr; }
  .controls-panel { position: static; }
  .reader { min-height: 52vh; max-height: none; }
}

@media (max-width: 520px) {
  body { padding-bottom: calc(88px + env(safe-area-inset-bottom)); }
  .app-header { flex-direction: column; }
  .transport-dock {
    width: calc(100% - 10px);
    padding: .42rem .4rem calc(.42rem + env(safe-area-inset-bottom));
    border-radius: 15px 15px 0 0;
  }
  .transport { gap: .25rem; }
  .transport button {
    min-height: 50px;
    padding: .45rem .18rem;
    border-radius: 10px;
  }
  .transport .transport-main { font-size: .82rem; }
  .paragraph { font-size: 1rem; }
}

@media (max-width: 360px) {
  .transport-label { display: none; }
  .transport .transport-main,
  .transport .transport-skip { font-size: 1.15rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --panel: #111827;
    --text: #f9fafb;
    --muted: #9ca3af;
    --border: #374151;
    --accent-soft: #172554;
    --shadow: none;
  }
  button.secondary { color: #bfdbfe; }
}

/* v2.2 - barra lettura sempre visibile: fallback robusto Android/PWA */
.transport-dock {
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
  position: fixed !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  top: auto !important;
  width: 100% !important;
  max-width: none !important;
  margin: 0 !important;
  transform: none !important;
  z-index: 2147483647 !important;
  padding: 8px 10px calc(8px + env(safe-area-inset-bottom, 0px)) !important;
  border: 0 !important;
  border-top: 2px solid var(--border) !important;
  border-radius: 0 !important;
  background: var(--panel) !important;
  box-shadow: 0 -8px 24px rgba(0, 0, 0, .22) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  pointer-events: auto !important;
}

.transport-dock .transport {
  width: min(760px, 100%) !important;
  margin: 0 auto !important;
  display: grid !important;
  grid-template-columns: .72fr 1.3fr 1.1fr 1fr .72fr !important;
  gap: 6px !important;
  align-items: stretch !important;
}

.transport-dock .transport button {
  display: inline-flex !important;
  visibility: visible !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 0 !important;
  min-height: 54px !important;
  margin: 0 !important;
  padding: 8px 6px !important;
  border-width: 1px !important;
  border-style: solid !important;
  border-radius: 12px !important;
  opacity: 1 !important;
  font-weight: 800 !important;
  line-height: 1 !important;
  white-space: nowrap !important;
}

.transport-dock .transport button:disabled {
  opacity: .62 !important;
}

.transport-dock #playBtn {
  background: #2563eb !important;
  border-color: #2563eb !important;
  color: #fff !important;
}

.transport-dock #pauseBtn {
  background: var(--panel) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

.transport-dock #stopBtn {
  background: #b91c1c !important;
  border-color: #b91c1c !important;
  color: #fff !important;
}

.transport-dock #prevBtn,
.transport-dock #nextBtn {
  background: var(--panel) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
  font-size: 1.2rem !important;
}

body {
  padding-bottom: calc(86px + env(safe-area-inset-bottom, 0px)) !important;
}

.reader {
  scroll-padding-bottom: calc(96px + env(safe-area-inset-bottom, 0px));
}

@media (max-width: 520px) {
  .transport-dock {
    padding-left: 5px !important;
    padding-right: 5px !important;
  }

  .transport-dock .transport {
    gap: 4px !important;
    grid-template-columns: .7fr 1.25fr 1.05fr .95fr .7fr !important;
  }

  .transport-dock .transport button {
    min-height: 56px !important;
    padding: 7px 3px !important;
    border-radius: 10px !important;
    font-size: .82rem !important;
  }

  .transport-dock #prevBtn,
  .transport-dock #nextBtn {
    font-size: 1.15rem !important;
  }

  body {
    padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px)) !important;
  }
}

@media (max-width: 360px) {
  .transport-dock .transport-label {
    display: none !important;
  }

  .transport-dock .transport button {
    font-size: 1.18rem !important;
  }
}

/* v2.3 - dock realmente in sovraimpressione rispetto alla viewport */
html, body {
  transform: none !important;
  filter: none !important;
  perspective: none !important;
}

body > #transportDock.transport-dock {
  position: fixed !important;
  inset: auto 0 0 0 !important;
  width: 100vw !important;
  max-width: 100vw !important;
  z-index: 2147483647 !important;
  margin: 0 !important;
  transform: none !important;
  contain: none !important;
}

@supports (padding: max(0px)) {
  body > #transportDock.transport-dock {
    padding-bottom: max(8px, env(safe-area-inset-bottom, 0px)) !important;
  }
}


/* v2.4 - EPUB / ebook */
.book-meta {
  margin-top: .8rem;
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg);
}
.book-cover {
  width: 64px;
  height: 88px;
  flex: 0 0 auto;
  object-fit: cover;
  border-radius: 7px;
  border: 1px solid var(--border);
}
.book-meta-text { min-width: 0; display: grid; gap: .25rem; }
.book-meta-text strong { overflow-wrap: anywhere; }
.book-meta-text span { color: var(--muted); font-size: .88rem; overflow-wrap: anywhere; }
.chapter-marker {
  margin: 1.35rem 0 .7rem;
  padding: .7rem .8rem;
  border-radius: 10px;
  background: var(--bg);
  border-left: 4px solid var(--accent);
  font-weight: 850;
  line-height: 1.35;
}
.chapter-marker:first-child { margin-top: 0; }


/* v2.5 - controllo velocità verticale sempre in sovraimpressione a sinistra */
.speed-dock {
  position: fixed !important;
  left: max(8px, env(safe-area-inset-left, 0px)) !important;
  bottom: calc(92px + env(safe-area-inset-bottom, 0px)) !important;
  z-index: 2147483646 !important;
  width: 62px !important;
  min-height: 250px !important;
  margin: 0 !important;
  padding: 8px 6px !important;
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 6px !important;
  visibility: visible !important;
  opacity: 1 !important;
  pointer-events: auto !important;
  border: 1px solid var(--border) !important;
  border-radius: 15px !important;
  background: var(--panel) !important;
  box-shadow: 6px 6px 22px rgba(0, 0, 0, .20) !important;
  transform: none !important;
  contain: none !important;
}

.speed-title {
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .03em;
  color: var(--muted);
  line-height: 1;
}

.speed-value {
  width: 100%;
  text-align: center;
  font-size: .82rem;
  font-weight: 850;
  color: var(--text);
  line-height: 1.1;
}

.speed-step {
  width: 44px !important;
  height: 44px !important;
  min-height: 44px !important;
  padding: 0 !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  border-radius: 11px !important;
  font-size: 1.35rem !important;
  font-weight: 900 !important;
  line-height: 1 !important;
  background: var(--panel) !important;
  color: var(--text) !important;
  border: 1px solid var(--border) !important;
}

.speed-range {
  width: 34px !important;
  height: 112px !important;
  margin: 1px 0 !important;
  padding: 0 !important;
  writing-mode: vertical-lr;
  direction: rtl;
  accent-color: var(--accent);
}

/* fallback per browser che non rendono correttamente il range verticale */
@supports not (writing-mode: vertical-lr) {
  .speed-range {
    width: 112px !important;
    height: 34px !important;
    transform: rotate(-90deg) !important;
    margin: 39px -39px !important;
  }
}

@media (max-width: 520px) {
  .speed-dock {
    left: max(5px, env(safe-area-inset-left, 0px)) !important;
    bottom: calc(94px + env(safe-area-inset-bottom, 0px)) !important;
    width: 56px !important;
    min-height: 238px !important;
    padding: 7px 5px !important;
    gap: 5px !important;
  }
  .speed-step {
    width: 42px !important;
    height: 42px !important;
    min-height: 42px !important;
  }
  .speed-range { height: 105px !important; }
  .reader { scroll-padding-left: 66px; }
}

@media (max-height: 560px) {
  .speed-dock {
    min-height: 205px !important;
  }
  .speed-range { height: 78px !important; }
}


/* v2.6 - controllo aggiornamenti PWA */
.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .55rem;
  flex-wrap: wrap;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: .35rem .65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}

.compact-btn {
  min-height: 38px;
  padding: .45rem .7rem;
  font-size: .84rem;
}

.update-overlay {
  position: fixed !important;
  inset: 0 !important;
  z-index: 2147483647 !important;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(0, 0, 0, .58);
}

.update-overlay.hidden { display: none !important; }

.update-card {
  width: min(520px, 100%);
  max-height: calc(100% - 20px);
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  color: var(--text);
  padding: 1.15rem;
  box-shadow: 0 18px 60px rgba(0, 0, 0, .35);
}

.update-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin-bottom: .8rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.8rem;
  font-weight: 900;
}

.update-copy h2 {
  margin: .25rem 0 .65rem;
  font-size: 1.25rem;
}

.update-copy p {
  margin: .45rem 0;
  line-height: 1.5;
}

.update-notes {
  padding: .75rem;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-weight: 650;
}

.update-hint {
  color: var(--muted);
  font-size: .88rem;
}

.update-actions {
  margin-top: 1rem;
  display: flex;
  justify-content: flex-end;
  gap: .6rem;
  flex-wrap: wrap;
}

body.update-dialog-open {
  overflow: hidden;
}

@media (max-width: 600px) {
  .app-header {
    gap: .7rem;
  }
  .header-actions {
    width: 100%;
    justify-content: flex-start;
  }
  .update-actions > button {
    flex: 1 1 140px;
  }
}


/* v2.8 - installazione PWA robusta */
.install-status-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .9rem;
  margin-bottom: 1rem;
  padding: .9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.install-status-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 900;
  font-size: 1.25rem;
}
.install-status-copy { min-width: 0; display: grid; gap: .2rem; }
.install-status-copy span { color: var(--muted); line-height: 1.4; font-size: .9rem; }
.install-status-card.ready .install-status-icon { background: #dcfce7; color: #166534; }
.install-status-card.warning .install-status-icon { background: #fef3c7; color: #92400e; }
.install-status-card.installed .install-status-icon { background: #dcfce7; color: #166534; }
.install-status-card.error .install-status-icon { background: #fee2e2; color: #991b1b; }

.pwa-check-list { display: grid; gap: .48rem; margin: .7rem 0 .9rem; }
.pwa-check-list > div { display: flex; align-items: center; gap: .55rem; color: var(--muted); font-size: .92rem; }
.pwa-check-dot { width: 18px; height: 18px; display: grid; place-items: center; border-radius: 50%; background: var(--bg); color: var(--muted); font-weight: 900; }
.pwa-check-dot.ok { background: #dcfce7; color: #166534; }
.pwa-check-dot.warn { background: #fef3c7; color: #92400e; }
.pwa-check-dot.bad { background: #fee2e2; color: #991b1b; }

.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.faq-item { border: 1px solid var(--border); border-radius: 16px; background: var(--panel); padding: .85rem 1rem; }
.faq-item summary { cursor: pointer; font-weight: 800; }
.faq-item p { color: var(--muted); line-height: 1.6; margin: .65rem 0 0; }

.install-help-overlay {
  position: fixed !important;
  inset: 0 !important;
  z-index: 2147483647 !important;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(0,0,0,.58);
}
.install-help-overlay.hidden { display: none !important; }
.install-help-card {
  width: min(520px, 100%);
  max-height: calc(100% - 20px);
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--panel);
  color: var(--text);
  padding: 1.15rem;
  box-shadow: 0 18px 60px rgba(0,0,0,.35);
}
.install-help-icon {
  width: 52px; height: 52px; display: grid; place-items: center;
  margin-bottom: .8rem; border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  font-size: 1.4rem; font-weight: 900;
}
.install-help-card h2 { margin: .25rem 0 .55rem; }
.install-help-card > p { color: var(--muted); line-height: 1.55; }
.install-help-steps { margin: .8rem 0; padding-left: 1.3rem; display: grid; gap: .5rem; line-height: 1.55; }
.install-help-warning { margin-top: .8rem; padding: .75rem; border-radius: 12px; background: #fef3c7; color: #78350f; border: 1px solid #fde68a; line-height: 1.45; }
.install-help-actions { display: flex; justify-content: flex-end; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }

@media (max-width: 720px) {
  .install-status-card { grid-template-columns: auto minmax(0, 1fr); }
  .install-status-card > button { grid-column: 1 / -1; width: 100%; }
  .faq-grid { grid-template-columns: 1fr; }
}

/* Reader Machine branding tweaks */
.header-actions { align-items: center; }
.controls-panel { top: 1rem; }
@media (max-width: 820px) {
  .controls-panel { position: static; }
}


/* v2.9 - interfaccia semplificata quando Reader Machine è installata */
.installed-topbar,
.installed-app-home {
  display: none;
}

@media (display-mode: standalone) {
  .site-header,
  .hero-section,
  #download,
  #features,
  #faq,
  .site-footer,
  .app-section-heading {
    display: none !important;
  }

  .installed-topbar,
  .installed-app-home {
    display: block;
  }
}

body.is-installed-app .site-header,
body.is-installed-app .hero-section,
body.is-installed-app #download,
body.is-installed-app #features,
body.is-installed-app #faq,
body.is-installed-app .site-footer,
body.is-installed-app .app-section-heading {
  display: none !important;
}

body.is-installed-app .installed-topbar,
body.is-installed-app .installed-app-home {
  display: block;
}

.installed-topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 96%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.installed-topbar-inner {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: calc(6px + env(safe-area-inset-top, 0px)) 8px 7px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.installed-menu {
  position: relative;
  min-width: 0;
}

.installed-menu > summary {
  list-style: none;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: .55rem .45rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--panel);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
  user-select: none;
}
.installed-menu > summary::-webkit-details-marker { display: none; }
.installed-menu[open] > summary {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.installed-menu-panel {
  position: absolute;
  top: calc(100% + 7px);
  left: 0;
  width: min(360px, calc(100vw - 16px));
  max-height: min(65vh, 520px);
  overflow: auto;
  padding: .8rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 16px 42px rgba(0,0,0,.25);
}

#installedNavigationMenu .installed-menu-panel {
  left: 50%;
  transform: translateX(-50%);
}
#installedInfoMenu .installed-menu-panel {
  left: auto;
  right: 0;
}

.installed-menu-panel .setting:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.installed-menu-panel .resume-row { margin-top: .8rem; }
.installed-menu-panel .status { margin-top: .8rem; }
.installed-menu-panel .help { margin-top: .8rem; }
.installed-menu-panel .config-note { margin-top: .7rem; }

.installed-version-row {
  display: flex;
  gap: .55rem;
  align-items: center;
  flex-wrap: wrap;
  padding-bottom: .75rem;
  margin-bottom: .75rem;
  border-bottom: 1px solid var(--border);
}

.menu-empty-note {
  margin: 0;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.5;
}

.installed-app-home {
  padding: 1rem 0 .4rem;
  background: var(--bg);
}

.installed-app-home-inner {
  text-align: center;
}

.installed-main-logo {
  width: min(94%, 620px);
  max-height: 280px;
  object-fit: contain;
  display: block;
  margin: .15rem auto .55rem;
}

.installed-app-title h1 {
  margin: .2rem 0 .35rem;
  font-size: clamp(1.45rem, 5vw, 2.15rem);
  line-height: 1.15;
}
.installed-app-title p {
  margin: 0 0 .85rem;
  color: var(--muted);
}

.installed-quick-open {
  width: min(720px, 100%);
  margin: 0 auto;
  text-align: left;
}

body.is-installed-app .installed-quick-open .open-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}
@media (display-mode: standalone) {
  .installed-quick-open .open-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .65rem;
  }
}

body.is-installed-app #appSection { padding-top: .35rem; }
@media (display-mode: standalone) { #appSection { padding-top: .35rem; } }

body.is-installed-app #appSection > .site-shell:first-child { display: none !important; }
@media (display-mode: standalone) { #appSection > .site-shell:first-child { display: none !important; } }

body.is-installed-app .layout {
  grid-template-columns: 1fr !important;
  padding-top: 0;
}
body.is-installed-app .controls-panel.installed-controls-source {
  display: none !important;
}
body.is-installed-app .reader-panel {
  width: min(900px, 100%);
  margin: 0 auto;
}
body.is-installed-app .reader {
  min-height: 50vh;
  max-height: none;
}
body.is-installed-app [data-install-trigger] {
  display: none !important;
}

@media (display-mode: standalone) {
  .layout { grid-template-columns: 1fr !important; padding-top: 0; }
  .controls-panel.installed-controls-source { display: none !important; }
  .reader-panel { width: min(900px, 100%); margin: 0 auto; }
  .reader { min-height: 50vh; max-height: none; }
  [data-install-trigger] { display: none !important; }
}

@media (max-width: 520px) {
  .installed-main-logo { width: 96%; max-height: 220px; }
  .installed-app-home { padding-top: .65rem; }
  .installed-menu-panel { max-height: 58vh; }
  .installed-quick-open .open-grid { grid-template-columns: 1fr !important; }
}


/* v3.0 - autenticazione utente e collegamento installazione */
.auth-gate {
  width: min(720px, 100%);
  margin: 0 auto 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.auth-brand-row { display: flex; gap: .9rem; align-items: center; }
.auth-icon { width: 66px; height: 66px; border-radius: 16px; flex: 0 0 auto; }
.auth-brand-row h3 { margin: .18rem 0 .25rem; font-size: 1.25rem; }
.auth-brand-row p { margin: 0; color: var(--muted); line-height: 1.5; }
.auth-form { margin-top: 1rem; display: grid; grid-template-columns: 1fr 1fr auto; gap: .65rem; align-items: end; }
.auth-form label { display: grid; gap: .35rem; font-weight: 750; min-width: 0; }
.auth-form input {
  width: 100%; min-height: 46px; border: 1px solid var(--border); border-radius: 11px;
  padding: .68rem .75rem; background: var(--panel); color: var(--text);
}
.auth-form button { min-height: 46px; }
.auth-message { margin: .75rem 0 0; color: var(--muted); line-height: 1.5; font-size: .9rem; }
.auth-message.error { color: var(--danger); }
.auth-user-bar {
  width: min(900px, 100%); margin: 0 auto .75rem; padding: .7rem .85rem;
  border: 1px solid var(--border); border-radius: 14px; background: var(--panel);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.auth-user-bar > div { min-width: 0; display: grid; gap: .08rem; }
.auth-user-bar strong, .auth-user-bar span { overflow-wrap: anywhere; }
.auth-user-bar #authUserEmail { color: var(--muted); font-size: .87rem; }
body.auth-locked .auth-protected { display: none !important; }
body:not(.auth-locked) .auth-gate { display: none !important; }
body.auth-locked #transportDock,
body.auth-locked #speedDock { display: none !important; }
body.auth-locked.is-installed-app #installedQuickOpen { display: none !important; }
body.auth-locked.is-installed-app .reader-panel { display: none !important; }
.installed-account-panel .account-card { display: grid; gap: .42rem; }
.installed-account-panel .account-card strong { overflow-wrap: anywhere; }
.installed-account-panel .account-card span { color: var(--muted); font-size: .88rem; overflow-wrap: anywhere; }
.installed-account-panel .account-card button { margin-top: .35rem; width: 100%; }
.installed-topbar-inner { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 680px) {
  .auth-brand-row { align-items: flex-start; }
  .auth-form { grid-template-columns: 1fr; }
  .auth-user-bar { align-items: flex-start; }
  .installed-topbar-inner { gap: 4px; padding-left: 5px; padding-right: 5px; }
  .installed-menu > summary { font-size: .83rem; padding-left: .2rem; padding-right: .2rem; }
}

#installedAccountMenu .installed-menu-panel { left: auto; right: 0; }