:root {
  --bg: #0f0f1a;
  --bg-soft: #1a1a2e;
  --panel: #16213e;
  --accent: #e94560;
  --text: #e8e8f0;
  --muted: #9aa0b4;
  --page-bg: #ffffff;
  --toolbar-h: 52px;
  --status-h: 56px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overscroll-behavior: none;
}

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.hidden { display: none !important; }

/* ---------- Ekran powitalny ---------- */
.welcome {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-y: auto;
  background: radial-gradient(circle at 50% 30%, var(--bg-soft), var(--bg));
  padding: 24px;
  z-index: 50;
}
.welcome-card {
  margin: auto auto 0; /* wyśrodkowana w pionie, gdy sama; treść SEO ląduje pod nią */
  max-width: 420px;
  text-align: center;
}

/* Treść SEO na stronie startowej */
.seo-content {
  max-width: 720px;
  width: 100%;
  margin: 40px auto 8px;
  padding: 28px 24px 8px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  color: var(--muted);
  text-align: left;
  line-height: 1.65;
  font-size: 15px;
}
.seo-content h2 {
  color: var(--text);
  font-size: 20px;
  margin: 28px 0 10px;
}
.seo-content h3 {
  color: var(--text);
  font-size: 16px;
  margin: 18px 0 4px;
}
.seo-content p { margin: 0 0 12px; }
.seo-content ul { margin: 0 0 12px; padding-left: 22px; }
.seo-content li { margin: 0 0 6px; }
.seo-content strong { color: var(--text); }
.seo-content .seo-foot { font-size: 12px; opacity: .65; margin-top: 22px; }
.welcome-logo { font-size: 64px; line-height: 1; }
.welcome h1 { margin: 16px 0 4px; font-size: 28px; }
.welcome-sub { color: var(--muted); margin: 0 0 22px; }
.welcome-diff {
  margin: 0 0 26px;
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .1);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}
.welcome-diff-title {
  display: block;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--accent);
}
.welcome-hint { color: var(--muted); font-size: 13px; margin-top: 24px; line-height: 1.6; }
.welcome-privacy {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
  background: rgba(233, 69, 96, .1);
  border: 1px solid rgba(233, 69, 96, .25);
  border-radius: 10px;
  padding: 12px 14px;
}
.welcome-privacy-how {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}
.welcome-coffee {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}
.welcome-coffee p {
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  margin: 0 0 14px;
}
.welcome-coffee-feedback {
  font-size: 13px !important;
  color: var(--muted) !important;
  background: rgba(255, 255, 255, .05);
  border-radius: 10px;
  padding: 10px 14px;
  margin: 0 0 16px !important;
}
.welcome-coffee a {
  display: inline-block;
  transition: transform .12s ease;
}
.welcome-coffee a:hover { transform: scale(1.03); }
.welcome-coffee img { border-radius: 8px; display: block; }

/* Panel informacyjny (ℹ️) w widoku otwartego PDF-a */
.info-panel {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
  background: rgba(15, 15, 26, .8);
  padding: 24px;
}
.info-card {
  position: relative;
  margin: auto;
  max-width: 440px;
  width: 100%;
  text-align: center;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
}
.info-card h2 { margin: 0 0 18px; }
.info-card .welcome-diff,
.info-card .welcome-privacy { text-align: left; }
.info-coffee { margin-top: 18px; }
.info-coffee p { color: var(--text); font-size: 14px; line-height: 1.6; margin: 0 0 12px; }
.info-coffee img { border-radius: 8px; display: inline-block; }
.info-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
  border-radius: 8px;
}
.info-close:hover { background: rgba(255, 255, 255, .08); color: var(--text); }

/* Dolny wiersz: kawa (lewo) — wskaźnik (środek) — odstęp (prawo, dla symetrii) */
.status-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: 100%;
  gap: 8px;
}
.status-spacer { display: block; }
.coffee-fab {
  justify-self: start;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #ffdd00;
  color: #1a1a2e;
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .35);
  transition: transform .12s ease, filter .12s ease;
}
.coffee-fab:hover { filter: brightness(1.05); transform: translateY(-1px); }
.coffee-fab:active { transform: scale(.96); }
@media (max-width: 480px) {
  .coffee-fab { font-size: 11px; padding: 5px 10px; gap: 4px; }
  .page-indicator { font-size: 12px; }
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 12px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .12s ease, filter .12s ease;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.file-btn { user-select: none; }
.btn-secondary { background: #2dbd6e; color: #fff; }
.btn-secondary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, .25);
  font-size: 14px;
  padding: 11px 22px;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .08); }
.welcome-action { display: block; width: 100%; margin: 0 auto 18px; }

/* ---------- Toolbar ---------- */
.toolbar {
  height: var(--toolbar-h);
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  padding-top: env(safe-area-inset-top);
  background: var(--panel);
  border-bottom: 1px solid rgba(255,255,255,.06);
  z-index: 20;
}
.toolbar-center { flex: 1; text-align: center; overflow: hidden; }
.toolbar-right { display: flex; align-items: center; gap: 4px; }
.book-title {
  font-size: 14px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  max-width: 100%;
}
.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .12s ease;
}
.icon-btn:hover { background: rgba(255,255,255,.08); }
.icon-btn:active { background: rgba(255,255,255,.15); }
.zoom-label { font-size: 12px; color: var(--muted); min-width: 40px; text-align: center; }

/* ---------- Viewer ---------- */
.viewer {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  min-height: 0;
}
.stage {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: auto;
  scrollbar-gutter: stable;
  display: flex;
  padding: 16px;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x pan-y;
}
.pages {
  /* margin:auto centruje treść, ale — w przeciwieństwie do align/justify-center —
     pozwala doscrollować do GÓRY i lewej krawędzi, gdy treść jest większa od obszaru */
  margin: auto;
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  transition: transform .05s linear;
  will-change: transform;
}
.pages > canvas {
  background: var(--page-bg);
  box-shadow: 0 8px 30px rgba(0,0,0,.5);
  border-radius: 2px;
  display: block;
}

/* Widok dokumentu (TXT / DOCX) — przewijalna „kartka" z czytelną typografią */
.doc-view {
  position: absolute;
  inset: 0;
  overflow: auto;
  scrollbar-gutter: stable;
  padding: 24px 16px;
  -webkit-overflow-scrolling: touch;
}
.doc-content {
  max-width: 760px;
  margin: 0 auto;
  background: var(--page-bg);
  color: #1a1a1a;
  border-radius: 4px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .45);
  padding: 48px 56px;
  font-size: 18px;
  line-height: 1.65;
  font-family: Georgia, "Times New Roman", serif;
  overflow-wrap: break-word;
}
.doc-content.txt { white-space: pre-wrap; font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 15px; }
.doc-content h1, .doc-content h2, .doc-content h3 { line-height: 1.25; margin: 1.2em 0 .5em; }
.doc-content p { margin: 0 0 1em; }
.doc-content img { max-width: 100%; height: auto; }
.doc-content table { border-collapse: collapse; max-width: 100%; }
.doc-content td, .doc-content th { border: 1px solid #ccc; padding: 4px 8px; }
@media (max-width: 600px) {
  .doc-content { padding: 28px 22px; font-size: 17px; }
}

/* Kontener e-booka (EPUB/MOBI) — foliate-view wypełnia obszar czytania */
.ebook-container {
  position: absolute;
  inset: 0;
  background: var(--page-bg);
}
.ebook-container foliate-view {
  display: block;
  width: 100%;
  height: 100%;
}

/* Tryb ciągły: strony jedna pod drugą, przewijane w dół */
.pages.continuous {
  flex-direction: column;
  gap: 16px;
  align-items: center;
}
.page-slot {
  background: var(--page-bg);
  box-shadow: 0 8px 30px rgba(0,0,0,.45);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}
.page-slot canvas { display: block; }

/* Tryb książki: lekki "grzbiet" między dwoma stronami */
.viewer.mode-book .pages { gap: 0; }
.viewer.mode-book .pages > canvas:first-child { border-radius: 2px 0 0 2px; }
.viewer.mode-book .pages > canvas:last-child { border-radius: 0 2px 2px 0; }
.viewer.mode-book .pages.spread::after {
  content: "";
  position: absolute;
}

/* Strzałki nawigacji (tryb książki) */
.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: rgba(22,33,62,.85);
  color: var(--text);
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
  z-index: 15;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.4);
  transition: background .12s ease, transform .12s ease;
}
.nav-arrow:hover { background: var(--accent); }
.nav-arrow:active { transform: translateY(-50%) scale(.92); }
.nav-arrow:disabled { opacity: .25; cursor: default; }
.nav-prev { left: 16px; }
.nav-next { right: 16px; }

/* W trybie pojedynczej strony (mobile/PWA) chowamy strzałki */
.viewer.mode-single .nav-arrow { display: none; }

/* ---------- Statusbar ---------- */
.statusbar {
  position: relative;
  min-height: var(--status-h);
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 16px;
  padding-bottom: calc(6px + env(safe-area-inset-bottom));
  background: var(--panel);
  border-top: 1px solid rgba(255,255,255,.06);
  z-index: 20;
}
.page-indicator { font-size: 13px; color: var(--muted); }
.page-indicator span { color: var(--text); font-weight: 600; }
.page-range {
  width: 100%;
  max-width: 600px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ---------- Baner aktualizacji ---------- */
.update-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px 16px;
  padding-top: calc(10px + env(safe-area-inset-top));
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .4);
}
.update-banner button {
  border: none;
  border-radius: 8px;
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  background: #fff;
  color: var(--accent);
}
.update-banner button:hover { filter: brightness(1.05); }
.update-banner .update-dismiss {
  background: transparent;
  color: #fff;
  padding: 7px 10px;
  font-weight: 400;
}

/* ---------- Loader ---------- */
.loader {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15,15,26,.6);
  z-index: 40;
}
.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid rgba(255,255,255,.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Animacja przejścia strony (swipe) */
.pages.swipe-left { animation: swipeLeft .25s ease; }
.pages.swipe-right { animation: swipeRight .25s ease; }
@keyframes swipeLeft {
  from { transform: translateX(40px); opacity: .3; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes swipeRight {
  from { transform: translateX(-40px); opacity: .3; }
  to { transform: translateX(0); opacity: 1; }
}

/* Ostrzeżenie file:// */
.file-warn {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 15, 26, .96);
  padding: 24px;
}
.file-warn-card {
  max-width: 440px;
  text-align: center;
  background: var(--panel);
  border: 1px solid rgba(233, 69, 96, .4);
  border-radius: 16px;
  padding: 28px 26px;
}
.file-warn-card h2 { margin: 10px 0 14px; }
.file-warn-card p { color: var(--muted); line-height: 1.6; margin: 10px 0; }
.file-warn-card code {
  background: rgba(255, 255, 255, .1);
  padding: 1px 6px;
  border-radius: 5px;
}
.file-warn-fix {
  color: var(--text) !important;
  background: rgba(233, 69, 96, .12);
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 16px !important;
}

/* Na wąskich ekranach nie pokazujemy etykiet zoomu w toolbarze */
@media (max-width: 520px) {
  .zoom-label { display: none; }
  .book-title { font-size: 13px; }
}