* {
  box-sizing: border-box;
}

:root {
  --bg-grad-1: #2c3e50;
  --bg-grad-2: #4b6cb7;
  --app-bg: #ffffff;
  --text-color: #222;
  --text-muted: #555;
  --text-muted-2: #666;
  --border-color: #ddd;
  --select-bg: #ffffff;
  --select-border: #ccc;
  --btn-icon-bg: #ecf0f1;
  --btn-icon-hover: #dfe6e9;
  --panel-bg: #f7f9fc;
  --panel-border: #d8e0ee;
  --setting-text: #444;
  --progress-bg: #e8e8e8;
  --card-back-grad-1: #eef1f7;
  --card-back-grad-2: #d6dfee;
  --card-back-border: #d8e0ee;
  --card-back-text: #222;
  --translation-color: #34495e;
  --example-de-color: #2c3e50;
  --example-pl-color: #7f8c8d;
  --speak-front-bg: rgba(255, 255, 255, 0.25);
  --speak-front-hover: rgba(255, 255, 255, 0.45);
  --speak-back-bg: rgba(0, 0, 0, 0.08);
  --speak-back-hover: rgba(0, 0, 0, 0.18);
  --btn-secondary-bg: #ecf0f1;
  --btn-secondary-color: #555;
  --summary-bg: #f7f9fc;
  --summary-border: #d8e0ee;
}

body.dark-theme {
  --bg-grad-1: #0e1117;
  --bg-grad-2: #1f2a44;
  --app-bg: #1c212b;
  --text-color: #e8eaed;
  --text-muted: #aab2c0;
  --text-muted-2: #9aa3b2;
  --border-color: #3a4356;
  --select-bg: #2a3140;
  --select-border: #3a4356;
  --btn-icon-bg: #2a3140;
  --btn-icon-hover: #384154;
  --panel-bg: #242a37;
  --panel-border: #3a4356;
  --setting-text: #cbd2e0;
  --progress-bg: #2a3140;
  --card-back-grad-1: #363f52;
  --card-back-grad-2: #272e3c;
  --card-back-border: #3a4356;
  --card-back-text: #e8eaed;
  --translation-color: #cdd6e8;
  --example-de-color: #cdd6e8;
  --example-pl-color: #9aa3b2;
  --speak-front-bg: rgba(255, 255, 255, 0.12);
  --speak-front-hover: rgba(255, 255, 255, 0.25);
  --speak-back-bg: rgba(255, 255, 255, 0.08);
  --speak-back-hover: rgba(255, 255, 255, 0.18);
  --btn-secondary-bg: #2a3140;
  --btn-secondary-color: #cbd2e0;
  --summary-bg: #242a37;
  --summary-border: #3a4356;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--bg-grad-1) 0%, var(--bg-grad-2) 100%);
  height: 100vh;
  height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12px;
  color: var(--text-color);
  transition: background 0.3s ease, color 0.3s ease;
}

.app {
  width: 100%;
  min-width: 0;
  max-width: 1180px;
  max-height: 100%;
  background: var(--app-bg);
  color: var(--text-color);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  transition: background 0.3s ease, color 0.3s ease;
}

/* Header */
.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}

.topbar h1 {
  grid-column: 2;
  justify-self: center;
  margin: 0;
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.app-logo {
  width: 6.2rem;
  height: 6.2rem;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 10px;
}

.brand-m {
  color: #0a1c47;
}

.brand-f {
  color: #df1f17;
}

body.dark-theme .brand-m {
  color: #6e8fe0;
}

body.dark-theme .brand-f {
  color: #ff6357;
}

.flag-de,
.flag-pl,
.flag-ar {
  width: 1.15em;
  height: auto;
  flex-shrink: 0;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
}

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

.header-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  margin: -2px 0 0;
  padding: 4px 0;
  border: none;
  background: none;
  color: var(--text-muted-2);
  font-size: 0.78rem;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

.header-toggle:hover {
  background: var(--btn-icon-bg);
  color: var(--text-color);
}

.header-toggle .chevron {
  font-size: 0.65rem;
}

.header-actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn-zoom {
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
  padding: 2px 10px;
}

.zoom-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header-mid-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.zoom-icon {
  font-size: 0.9rem;
  line-height: 1;
  opacity: 0.8;
}

/* Baner z propozycją instalacji aplikacji (PWA) - pojawia się tylko gdy
   przeglądarka faktycznie zgłosi zdarzenie beforeinstallprompt. */
.install-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  margin-bottom: 8px;
}

.install-banner-text {
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.3;
}

.install-banner-btn {
  flex-shrink: 0;
  background: #fff;
  color: #2980b9;
  font-weight: 700;
  padding: 6px 14px;
  white-space: nowrap;
}

.install-banner-btn:hover:not(:disabled) {
  background: #eaf4fc;
}

.install-banner-close {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: #fff;
  opacity: 0.8;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px;
}

.install-banner-close:hover {
  opacity: 1;
}

@media (max-width: 480px) {
  .install-banner {
    flex-wrap: wrap;
  }
}

/* Pasek wyboru wersji językowej (góra strony) */
.lang-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.lang-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  line-height: 1;
}

.lang-bar-item svg {
  width: 1.2em;
  height: auto;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2);
  flex-shrink: 0;
}

.lang-bar-current {
  background: var(--bg-grad-2);
  color: #fff;
  cursor: default;
}

.lang-bar-link {
  background: var(--btn-icon-bg);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: background 0.2s, color 0.2s, transform 0.15s;
}

.lang-bar-link:hover {
  background: var(--btn-icon-hover);
  color: var(--text-color);
  transform: translateY(-1px);
}

.deck-select {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
}

.deck-select-label {
  flex-shrink: 0;
}

.deck-dropdown {
  position: relative;
  flex: 0 1 auto;
  width: 260px;
  max-width: 100%;
  min-width: 0;
}

.deck-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--select-border);
  background: var(--select-bg);
  color: var(--text-color);
  font-size: 0.9rem;
  cursor: pointer;
  text-align: left;
}

.deck-dropdown-toggle:hover {
  background: var(--btn-icon-hover);
}

.deck-dropdown-flag svg {
  width: 1.15em;
  height: auto;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
  display: block;
}

.deck-dropdown-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.deck-dropdown-arrow {
  font-size: 0.7rem;
  opacity: 0.6;
  flex-shrink: 0;
  transition: transform 0.15s;
}

.deck-dropdown-toggle[aria-expanded="true"] .deck-dropdown-arrow {
  transform: rotate(180deg);
}

.deck-dropdown-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 50;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
  max-height: 260px;
  overflow-y: auto;
}

.deck-dropdown-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.deck-dropdown-option:hover,
.deck-dropdown-option.active {
  background: var(--btn-icon-bg);
}

.deck-dropdown-option svg {
  width: 1.15em;
  height: auto;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
  display: block;
}

.deck-dropdown-option-label {
  flex: 1;
  min-width: 0;
}

.btn-icon {
  background: var(--btn-icon-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  border-radius: 10px;
  font-size: 1.1rem;
  line-height: 1;
  padding: 8px 12px;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  transition: background 0.2s, transform 0.15s, box-shadow 0.15s;
}

.btn-icon:hover {
  background: var(--btn-icon-hover);
  transform: translateY(-1px);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.12);
}

.btn-icon:active {
  transform: scale(0.95);
  box-shadow: none;
}

/* Settings panel */
.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 14px 16px;
}

.setting-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--setting-text);
  cursor: pointer;
}

/* Konto / logowanie Google */
.account-section {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--panel-border);
}

.account-hint {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.google-btn-container {
  display: flex;
  justify-content: center;
}

.account-logged-in {
  display: flex;
  align-items: center;
  gap: 10px;
}

.account-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.account-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--setting-text);
}

.setting-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  cursor: pointer;
}

.settings-back-link {
  display: block;
  margin-top: 4px;
  padding: 10px;
  border-top: 1px solid var(--panel-border);
  border-radius: 10px;
  background: var(--btn-icon-bg);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  color: var(--setting-text);
  text-decoration: none;
}

.settings-back-link:hover {
  background: var(--btn-icon-hover);
  text-decoration: underline;
}

.settings-contact-btn {
  width: 100%;
}

.settings-install-btn {
  width: 100%;
  margin-bottom: 8px;
}

/* Formularz kontaktowy (modal otwierany z ustawień) */
.contact-hint {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

#contactForm {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--setting-text);
}

.contact-field input,
.contact-field textarea {
  font: inherit;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--select-border);
  background: var(--select-bg);
  color: var(--text-color);
  resize: vertical;
}

.g-recaptcha {
  display: flex;
  justify-content: center;
  transform: scale(0.95);
  transform-origin: center;
}

.contact-error {
  margin: 0;
  font-size: 0.85rem;
  color: #d63031;
  font-weight: 600;
}

.contact-success {
  text-align: center;
  font-weight: 600;
  color: #27ae60;
}

.setting-row-select {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  cursor: default;
}

.setting-select {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  color: var(--setting-text);
  font-size: 0.9rem;
  cursor: pointer;
}

/* Stats */
.stats {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stats-text {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.stats-learning {
  color: #d68910;
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: var(--progress-bg);
  border-radius: 6px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #27ae60, #2ecc71);
  transition: width 0.3s ease;
}

/* Session info */
.session-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-muted-2);
  font-weight: 600;
}

#cardCounter {
  flex: 1;
  min-width: 0;
}

/* Słowo nad obrazkiem fiszki (4:3, do 800x600, skalowany do szerokości ekranu) */
.card-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  min-width: 0;
}

.card-image-wrapper {
  width: 100%;
  min-width: 0;
  max-width: 600px;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea, #764ba2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.card-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Card */
#sessionArea {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-wrapper {
  perspective: 1200px;
  width: 100%;
}

.card-nav {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: var(--btn-icon-bg);
  color: var(--text-color);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s, opacity 0.2s;
}

.card-nav:hover:not(:disabled) {
  background: var(--btn-icon-hover);
  transform: scale(1.08);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.12);
}

.card-nav:active:not(:disabled) {
  transform: scale(0.95);
  box-shadow: none;
}

.card-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.card {
  position: relative;
  width: 100%;
  min-height: 220px;
  display: grid;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s;
}

.card.flipped {
  transform: rotateY(180deg);
}

/* Nowa fiszka ma wskoczyć na przód od razu, bez animacji obrotu - inaczej
   przez chwilę widać już podmienioną (nową) treść na tylnej stronie karty,
   zanim animacja dojedzie z powrotem do przodu. */
.card.no-transition {
  transition: none !important;
}

.card-face {
  grid-row: 1;
  grid-column: 1;
  width: 100%;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border-radius: 16px;
  padding: 14px 12px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 0;
  min-height: 0;
  gap: 8px;
}

.card-front {
  background: radial-gradient(ellipse at 50% 30%, #1c6b3f 0%, #0f4a2a 55%, #082e1a 100%);
  color: #fff;
}

.card-back {
  background: linear-gradient(135deg, var(--card-back-grad-1), var(--card-back-grad-2));
  color: var(--card-back-text);
  transform: rotateY(180deg);
  border: 1px solid var(--card-back-border);
}

.word-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  flex: 1;
  min-width: 0;
  max-width: 100%;
}

.word {
  font-size: calc(1.7rem * var(--text-scale, 1));
  font-weight: 700;
  word-break: break-word;
}

.translation {
  font-size: calc(1.4rem * var(--text-scale, 1));
  font-weight: 700;
  color: var(--translation-color);
}

.word-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}

.synonym-hint {
  font-size: calc(0.8rem * var(--text-scale, 1));
  opacity: 0.75;
  margin-top: 2px;
}

.pronunciation-hint {
  font-size: calc(0.85rem * var(--text-scale, 1));
  font-style: italic;
  opacity: 0.8;
  margin-top: 2px;
}

.example {
  margin-top: 8px;
  max-width: 100%;
}

.example-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
}

.example-de {
  font-size: calc(0.9rem * var(--text-scale, 1));
  font-style: italic;
  color: var(--example-de-color);
  margin: 3px 0;
}

.example-pl {
  font-size: calc(0.8rem * var(--text-scale, 1));
  color: var(--example-pl-color);
  margin: 3px 0;
}

.example-block {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px solid var(--border-color);
}

.hint {
  flex-shrink: 0;
  padding-top: 6px;
  font-size: 0.68rem;
  opacity: 0.7;
}

.speak-btn {
  background: var(--speak-front-bg);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  /* Wymusza osobną warstwę renderowania - naprawia błąd na Chrome/Android,
     gdzie dotyk wewnątrz obracanej w 3D fiszki (.card, preserve-3d) trafiał
     w całą kartę zamiast w ten mały przycisk (złe wyliczanie hit-testu pod
     transformacją 3D). Na desktopie problem nie występował. */
  position: relative;
  transform: translateZ(1px);
}

.speak-btn:hover {
  background: var(--speak-front-hover);
  transform: translateZ(1px) scale(1.08);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.card-back .speak-btn {
  background: var(--speak-back-bg);
  color: var(--card-back-text);
}

.card-back .speak-btn:hover {
  background: var(--speak-back-hover);
}

.btn-perfekt {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--card-back-border);
  background: transparent;
  color: var(--card-back-text);
  font-size: calc(0.85rem * var(--text-scale, 1));
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  /* Ta sama poprawka co .speak-btn - osobna warstwa renderowania naprawia
     hit-test na Chrome/Android wewnątrz obracanej w 3D fiszki. */
  position: relative;
  transform: translateZ(1px);
}

.btn-perfekt:hover {
  background: var(--speak-back-bg);
  transform: translateZ(1px) translateY(-1px);
}

/* Actions */
.actions {
  display: flex;
  gap: 12px;
}

.btn {
  flex: 1;
  padding: 10px 10px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s;
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-repeat {
  background: linear-gradient(135deg, #f7b733, #f39c12);
  color: #fff;
}

.btn-known {
  background: linear-gradient(135deg, #2ecc71, #27ae60);
  color: #fff;
}

.actions-difficulty {
  margin-top: 8px;
}

.btn-trudne {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: #fff;
}

.btn-bardzo-trudne {
  background: linear-gradient(135deg, #8b1a2b, #5c0f1a);
  color: #fff;
}

/* Banery "Trudne" / "Bardzo trudne" - stały skrót do powtórki najtrudniejszych
   słówek z bieżącego zestawu, niezależny od aktualnej sesji nauki. */
.difficulty-banners {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.difficulty-banner {
  display: block;
  width: 100%;
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.difficulty-banner:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}

.difficulty-banner-trudne {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.difficulty-banner-bardzo-trudne {
  background: linear-gradient(135deg, #8b1a2b, #5c0f1a);
}

/* Pasek widoczny w trakcie sesji powtórki "Trudne"/"Bardzo trudne" - daje
   sposób na wyjście z niej z powrotem do zwykłej nauki (patrz
   startDifficultySession w app.js). */
.difficulty-session-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 10px;
  margin-bottom: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.difficulty-session-bar[data-mode="bardzo_trudne"] {
  background: linear-gradient(135deg, #8b1a2b, #5c0f1a);
}

.difficulty-session-exit {
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: #fff;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.difficulty-session-exit:hover {
  background: rgba(255, 255, 255, 0.32);
}

@media (max-width: 480px) {
  .difficulty-session-bar {
    flex-wrap: wrap;
  }
}

.btn-primary {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: #fff;
  width: 100%;
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-color);
  font-size: 0.8rem;
  padding: 8px 12px;
  box-shadow: none;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--btn-icon-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Summary */
.summary {
  text-align: center;
  background: var(--summary-bg);
  border-radius: 16px;
  padding: 16px;
  border: 1px solid var(--summary-border);
}

.summary h2 {
  margin-top: 0;
}

.summary p {
  font-size: 1.1rem;
  margin: 6px 0;
}

.summary-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.login-gate {
  margin-top: 10px;
}

.login-gate p {
  font-size: 0.95rem;
  margin: 0 0 10px;
}

/* Blokada płatnej paczki */
.deck-locked-gate {
  text-align: center;
  background: var(--summary-bg);
  border: 1px solid var(--summary-border);
  border-radius: 16px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.deck-locked-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.deck-locked-hint {
  margin: 0;
  max-width: 420px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

#lockedNeedsLogin {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.hidden {
  display: none !important;
}

/* Footer */
.footer {
  text-align: center;
}

.btn-back-home {
  display: block;
  text-align: center;
  margin: 18px auto 8px;
  color: #3498db;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.btn-back-home:hover {
  color: #2980b9;
  text-decoration: underline;
}

body.dark-theme .btn-back-home {
  color: #5dade2;
}

body.dark-theme .btn-back-home:hover {
  color: #85c1e9;
}

@media (max-width: 600px) {
  body {
    padding: 6px;
  }

  .app {
    padding: 10px;
    border-radius: 12px;
    gap: 6px;
  }

  .topbar {
    gap: 6px;
  }

  .topbar h1 {
    font-size: 1.15rem;
  }

  .deck-select {
    justify-content: space-between;
  }

  .session-info {
    font-size: 0.85rem;
  }

  .card-top {
    gap: 6px;
  }

  .card-body {
    gap: 5px;
  }

  .card-face {
    padding: 8px 10px;
  }

  .hint {
    padding-top: 4px;
  }

  .actions {
    gap: 8px;
  }

  .btn {
    padding: 8px 8px;
  }

  .progress-bar {
    height: 8px;
  }
}

@media (max-width: 380px) {
  .app-logo {
    width: 4.4rem;
    height: 4.4rem;
  }

  .topbar h1 {
    font-size: 1.05rem;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .word {
    font-size: calc(1.4rem * var(--text-scale, 1));
  }
  .translation {
    font-size: calc(1.2rem * var(--text-scale, 1));
  }

  /* Bardzo wąskie ekrany (małe telefony, zegarki Wear OS) — pasek górny
     nie mieści się w jednym rzędzie, więc zamiast wychodzić poza widoczny
     obszar, elementy zawijają się/układają w kolumnę. */
  .lang-bar {
    flex-wrap: wrap;
    gap: 6px;
  }

  .topbar {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .topbar h1 {
    grid-column: 1;
  }

  .header-actions {
    grid-column: 1;
    justify-self: stretch;
    width: 100%;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-between;
  }

  .deck-select {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Bardzo niskie okna (np. telefon w orientacji poziomej) - dodatkowa kompresja */
@media (max-height: 700px) {
  body {
    padding: 6px;
  }

  .app {
    padding: 10px;
    gap: 6px;
  }

  .settings-panel {
    padding: 8px 12px;
  }

  .card {
    min-height: 200px;
  }

  .card-face {
    padding: 10px 10px;
  }
}

/* Modal: przykład użycia w Perfekt */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.modal-box {
  background: var(--app-bg);
  color: var(--text-color);
  border-radius: 16px;
  padding: 18px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-box-scroll {
  max-height: 85vh;
  overflow-y: auto;
}

.help-body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-color);
}

.help-body strong {
  color: var(--setting-text);
}

.modal-example-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-example-de {
  margin: 0;
  font-weight: 600;
  font-size: calc(1.05rem * var(--text-scale, 1));
  color: var(--text-color);
}

.modal-example-pl {
  margin: 0;
  font-size: calc(0.9rem * var(--text-scale, 1));
  color: var(--text-muted);
}

.modal-speak-btn {
  background: var(--btn-icon-bg);
  color: var(--text-color);
}

.modal-speak-btn:hover {
  background: var(--btn-icon-hover);
}

.modal-synonym-block {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-synonym-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}