/* =========================================================
   Karteikarten — Apple-inspired minimal design
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-elevated: #f5f5f7;
  --bg-card: #ffffff;
  --bg-hover: #f0f0f2;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #a1a1a6;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --primary: #0071e3;
  --primary-hover: #0077ed;
  --primary-active: #006edb;
  --danger: #ff3b30;
  --success: #34c759;
  --warning: #ff9500;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.05);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --topbar-height: 52px;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #000000;
  --bg-elevated: #1c1c1e;
  --bg-card: #1c1c1e;
  --bg-hover: #2c2c2e;
  --text: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.16);
  --primary: #0a84ff;
  --primary-hover: #1a8fff;
  --primary-active: #0073e6;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --bg-card: #1c1c1e;
    --bg-hover: #2c2c2e;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.16);
    --primary: #0a84ff;
    --primary-hover: #1a8fff;
    --primary-active: #0073e6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.01em;
  transition: background-color var(--transition), color var(--transition);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

.muted {
  color: var(--text-secondary);
  font-size: 14px;
}

/* =========================================================
   Top Bar
   ========================================================= */

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  height: var(--topbar-height);
}

[data-theme="dark"] .topbar {
  background: rgba(28, 28, 30, 0.72);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .topbar {
    background: rgba(28, 28, 30, 0.72);
  }
}

.topbar-inner {
  max-width: 980px;
  height: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Brand (Logo + Wordmark) — links in der Topbar */
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
  padding: 4px 8px 4px 4px;
  margin-left: -4px;
  border-radius: 10px;
  transition: background var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.brand:hover { background: rgba(0, 0, 0, 0.05); }

[data-theme="dark"] .brand:hover,
:root:not([data-theme="light"]) .brand:hover { background: rgba(255, 255, 255, 0.07); }

.brand-logo {
  width: 30px;
  height: 30px;
  object-fit: contain;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.10));
  flex-shrink: 0;
}

.brand-name {
  font-family: "Cinzel", "Trajan Pro", "Times New Roman", serif;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.08em;
  color: var(--text);
  white-space: nowrap;
  /* Cinzel-Caps optisch leicht nach unten justieren, damit's mit dem Logo bündig sitzt */
  line-height: 1;
  transform: translateY(1px);
}

/* Topbar-Titel — wird zur dezenten kontextuellen Sub-Anzeige (nur wenn JS Inhalt setzt) */
.topbar-title {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-align: center;
  color: var(--text-tertiary);
  margin: 0 8px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* Auf der Startseite blenden wir den Sub-Title aus (Brand reicht) */
body[data-current-view="decks"] .topbar-title { visibility: hidden; }

@media (max-width: 480px) {
  /* Auf kleinen Screens nur Logo zeigen — Wortmarke würde Icons verdrängen */
  .brand-name { display: none; }
}

.icon-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text);
  border-radius: 50%;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

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

/* =========================================================
   Main / Views
   ========================================================= */

#main {
  flex: 1;
  width: 100%;
}

.view {
  display: none;
  animation: fadeIn 280ms ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 96px;
}

.hero {
  margin-bottom: 28px;
}

.hero h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 4px;
}

/* =========================================================
   Decks Tree (hierarchisch)
   ========================================================= */

.decks-tree {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.deck-tree-row {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  padding-left: calc(16px + var(--depth, 0) * 24px);
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  gap: 10px;
  transition: background var(--transition);
}

.deck-tree-row:hover { background: var(--bg-hover); }

.deck-tree-node:last-child > .deck-tree-row { border-bottom: none; }

.tree-chevron {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  padding: 0;
  flex-shrink: 0;
  transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1), background var(--transition);
}

.tree-chevron:hover { background: var(--bg-elevated); }

.tree-chevron.expanded { transform: rotate(90deg); }

.tree-chevron-spacer { width: 22px; flex-shrink: 0; display: inline-block; }

.tree-icon {
  width: 18px;
  height: 18px;
  color: var(--text-tertiary);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tree-icon.is-folder { color: var(--primary); }

.tree-label { flex: 1; min-width: 0; }

.tree-name {
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-stats {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.tree-stats strong { color: var(--text); font-weight: 600; }

.tree-due strong { color: var(--primary); }

.tree-done { color: var(--success); }

/* Breadcrumb in Deck-Detail */
.breadcrumb {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.breadcrumb-item {
  cursor: pointer;
  transition: color var(--transition);
}

.breadcrumb-item:hover { color: var(--primary); }

.breadcrumb-sep {
  color: var(--text-tertiary);
  font-size: 11px;
  margin: 0 2px;
}

/* Sub-Decks-Liste in Deck-Detail */
.subdecks-section { margin-bottom: 28px; }

.subdecks-section h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
  letter-spacing: -0.005em;
}

.subdecks-list {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.subdeck-row {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  transition: background var(--transition);
}

.subdeck-row:last-child { border-bottom: none; }
.subdeck-row:hover { background: var(--bg-hover); }

.subdeck-row .tree-icon { color: var(--primary); }

.subdeck-row-content { flex: 1; min-width: 0; }

.subdeck-row-name {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 2px;
}

.subdeck-row-stats {
  font-size: 12px;
  color: var(--text-secondary);
}

.subdeck-row-arrow {
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.empty-state {
  text-align: center;
  padding: 64px 20px;
  color: var(--text-secondary);
}

.empty-state h3 {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--text);
}

/* =========================================================
   Buttons
   ========================================================= */

.btn-primary, .btn-secondary, .btn-tertiary, .btn-danger {
  font: inherit;
  font-weight: 500;
  border: none;
  border-radius: 980px;
  padding: 10px 20px;
  cursor: pointer;
  transition: background var(--transition), transform 80ms ease, opacity var(--transition);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { background: var(--primary-active); transform: scale(0.98); }

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
}

.btn-secondary:hover { background: var(--bg-hover); }

.btn-tertiary {
  background: transparent;
  color: var(--primary);
  padding: 10px 14px;
}

.btn-tertiary:hover { background: var(--bg-hover); }

.btn-tertiary.small {
  padding: 6px 10px;
  font-size: 13px;
}

.btn-danger {
  background: transparent;
  color: var(--danger);
}

.btn-danger:hover { background: rgba(255, 59, 48, 0.1); }

.btn-primary:disabled, .btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.action-row .btn-tertiary { margin-left: auto; color: var(--danger); }

/* Floating Action Button */
.fab {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), background var(--transition);
  z-index: 50;
}

.fab:hover {
  transform: scale(1.06);
  background: var(--primary-hover);
}

.fab:active {
  transform: scale(0.96);
}

/* =========================================================
   Cards List (deck detail)
   ========================================================= */

.cards-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 12px;
}

.cards-list-header h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

#card-search {
  font: inherit;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: 980px;
  padding: 8px 14px;
  color: var(--text);
  width: 220px;
  transition: border-color var(--transition), background var(--transition);
}

#card-search:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-card);
}

.cards-list {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-row {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
  gap: 16px;
}

.card-row:last-child { border-bottom: none; }
.card-row:hover { background: var(--bg-hover); }

.card-row-content {
  flex: 1;
  min-width: 0;
}

.card-row-front {
  font-weight: 500;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-row-back {
  color: var(--text-secondary);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-row-meta {
  font-size: 12px;
  color: var(--text-tertiary);
  text-align: right;
  flex-shrink: 0;
}

.card-row-meta .due-badge {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 2px 8px;
  border-radius: 980px;
  font-weight: 500;
  font-size: 11px;
}

.card-row-meta .new-badge {
  display: inline-block;
  background: var(--success);
  color: white;
  padding: 2px 8px;
  border-radius: 980px;
  font-weight: 500;
  font-size: 11px;
}

/* =========================================================
   Study View
   ========================================================= */

.study-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: calc(100vh - var(--topbar-height));
  padding-top: 32px;
}

.study-progress {
  width: 100%;
  max-width: 600px;
  margin-bottom: 32px;
}

#study-progress-text {
  font-size: 13px;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
  text-align: center;
}

.progress-bar {
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 980px;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  background: var(--primary);
  width: 0;
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 980px;
}

.flashcard {
  perspective: 1600px;
  width: 100%;
  max-width: 600px;
  height: 360px;
  margin-bottom: 32px;
  cursor: pointer;
}

/* Exit/Enter beim Wechsel zur nächsten Karte
   — verhindert, dass beim Zurückdrehen kurz die neue Rückseite zu sehen ist.
   Stattdessen: aktuelle Karte slidet weg, neue Karte slidet rein,
   der unsichtbare Flip-Reset passiert dazwischen ohne Animation. */

@keyframes flashcard-exit {
  to {
    opacity: 0;
    transform: scale(0.94) translateY(-14px);
    filter: blur(2px);
  }
}

@keyframes flashcard-enter {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(22px);
    filter: blur(2px);
  }
}

.flashcard.exiting {
  animation: flashcard-exit 240ms cubic-bezier(0.4, 0, 1, 1) forwards;
  pointer-events: none;
}

.flashcard.entering {
  animation: flashcard-enter 340ms cubic-bezier(0, 0, 0.2, 1);
  pointer-events: none;
}

/* Während des unsichtbaren Flip-Resets keine Inner-Transition,
   damit das Zurückdrehen instant passiert */
.flashcard.no-flip-anim .flashcard-inner {
  transition: none !important;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 600ms cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
}

.flashcard-back {
  transform: rotateY(180deg);
}

.card-content {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.3;
  white-space: pre-wrap;
  word-break: break-word;
  max-width: 100%;
}

.hint {
  position: absolute;
  bottom: 20px;
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.rating-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  width: 100%;
  max-width: 600px;
}

.rate-btn {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  padding: 14px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: all var(--transition);
}

.rate-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.rate-btn:active { transform: scale(0.98); }

.rate-label {
  font-weight: 600;
  font-size: 14px;
}

.rate-interval {
  font-size: 11px;
  color: var(--text-tertiary);
}

.rate-again { border-top: 3px solid var(--danger); }
.rate-hard { border-top: 3px solid var(--warning); }
.rate-good { border-top: 3px solid var(--primary); }
.rate-easy { border-top: 3px solid var(--success); }

.study-done {
  text-align: center;
  padding: 60px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.done-icon {
  color: var(--success);
  margin-bottom: 8px;
}

.study-done h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.025em;
}

/* =========================================================
   Cloze (Lückentext)
   ========================================================= */

.cloze-blank {
  display: inline-block;
  background: var(--bg-elevated);
  color: var(--text-tertiary);
  padding: 0 8px;
  border-radius: 6px;
  font-weight: 500;
  border: 1px dashed var(--border-strong);
  margin: 0 1px;
  letter-spacing: 0.05em;
}

.cloze-active {
  display: inline-block;
  background: rgba(255, 149, 0, 0.20);
  color: var(--warning);
  padding: 0 6px;
  border-radius: 6px;
  font-weight: 600;
  margin: 0 1px;
}

[data-theme="dark"] .cloze-active,
:root:not([data-theme="light"]) .cloze-active {
  background: rgba(255, 159, 10, 0.22);
  color: #ff9f0a;
}

/* Kartentyp-Badge in der Kartenliste */
.card-type-badge {
  display: inline-block;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  margin-right: 8px;
  letter-spacing: 0.04em;
  vertical-align: 2px;
  text-transform: uppercase;
}

/* =========================================================
   Tags
   ========================================================= */

.tag-input-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  min-height: 42px;
  margin-top: 6px;
  transition: border-color var(--transition), background var(--transition);
}

.tag-input-wrapper:focus-within {
  border-color: var(--primary);
  background: var(--bg-card);
}

.tag-input-wrapper input[type="text"] {
  background: transparent;
  border: none;
  flex: 1;
  min-width: 120px;
  padding: 2px 4px;
  margin: 0;
  font: inherit;
  color: var(--text);
  outline: none;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(0, 113, 227, 0.12);
  color: var(--primary);
  font-size: 12px;
  font-weight: 500;
  padding: 3px 4px 3px 9px;
  border-radius: 980px;
  white-space: nowrap;
  letter-spacing: -0.005em;
}

[data-theme="dark"] .tag-pill,
:root:not([data-theme="light"]) .tag-pill {
  background: rgba(10, 132, 255, 0.18);
}

.tag-pill .tag-remove {
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 1;
  opacity: 0.65;
  transition: background var(--transition), opacity var(--transition);
}

.tag-pill .tag-remove:hover {
  background: rgba(0, 0, 0, 0.08);
  opacity: 1;
}

/* Filter-Chips über der Kartenliste */
.tag-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.tag-chip {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid transparent;
  font: inherit;
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 980px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.tag-chip:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.tag-chip.active {
  background: var(--primary);
  color: white;
}

.tag-chip-count {
  font-size: 11px;
  opacity: 0.7;
}

/* Inline-Tags auf Card-Rows */
.card-row-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.card-tag {
  font-size: 11px;
  color: var(--primary);
  background: rgba(0, 113, 227, 0.10);
  padding: 1px 7px;
  border-radius: 980px;
  font-weight: 500;
  letter-spacing: -0.005em;
}

[data-theme="dark"] .card-tag,
:root:not([data-theme="light"]) .card-tag {
  background: rgba(10, 132, 255, 0.15);
}

/* =========================================================
   Modal
   ========================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: overlayFade 200ms ease;
}

@keyframes overlayFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-wide { max-width: 640px; }

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.modal label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.modal input[type="text"],
.modal input[type="password"],
.modal input[type="number"],
.modal textarea,
.modal select {
  display: block;
  width: 100%;
  margin-top: 6px;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  transition: border-color var(--transition), background var(--transition);
}

.modal textarea {
  resize: vertical;
  min-height: 60px;
  font-family: inherit;
}

.modal input:focus, .modal textarea:focus, .modal select:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-card);
}

.modal small {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 400;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
  align-items: center;
}

/* =========================================================
   AI Suggestions
   ========================================================= */

.ai-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 40px 0;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.ai-error {
  background: rgba(255, 59, 48, 0.1);
  color: var(--danger);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 14px;
  margin: 12px 0;
}

.ai-results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 16px 0 12px;
  font-size: 13px;
  color: var(--text-secondary);
}

#ai-suggestions-list {
  max-height: 380px;
  overflow-y: auto;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.ai-suggestion {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}

.ai-suggestion:last-child { border-bottom: none; }
.ai-suggestion:hover { background: var(--bg-hover); }

.ai-suggestion input[type="checkbox"] {
  margin-top: 4px;
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.ai-suggestion-content {
  flex: 1;
  min-width: 0;
}

.ai-suggestion-front {
  font-weight: 500;
  margin-bottom: 2px;
}

.ai-suggestion-back {
  color: var(--text-secondary);
  font-size: 13px;
}

.ai-suggestion-meta {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 4px;
  letter-spacing: 0.02em;
}

.ai-suggestion-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}

.import-ai-tags-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.import-ai-tags-row .muted {
  flex: 1;
  font-size: 12px;
  min-width: 200px;
}

.import-ai-tags-row .btn-secondary {
  padding: 6px 14px;
  font-size: 13px;
}

.import-ai-tags-row .btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* =========================================================
   Stats / Dashboard
   ========================================================= */

.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.kpi-value {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 4px;
  line-height: 1;
}

.kpi-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 22px 18px;
  margin-bottom: 14px;
}

.chart-card h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 14px;
  letter-spacing: -0.005em;
}

.chart svg { width: 100%; height: auto; display: block; }

.chart-bar           { transition: opacity var(--transition); }
.chart-bar:hover     { opacity: 0.78; }
.chart-bar-default   { fill: var(--bg-elevated); stroke: var(--border-strong); stroke-width: 1; }
.chart-bar-today,
.chart-bar-primary   { fill: var(--primary); }
.chart-axis-label    { font-size: 10px; fill: var(--text-tertiary); }
.chart-value-label   { font-size: 10px; fill: var(--text-secondary); font-weight: 500; }

.state-bar {
  height: 14px;
  border-radius: 980px;
  display: flex;
  overflow: hidden;
  background: var(--bg-elevated);
  margin-bottom: 16px;
}

.state-seg { height: 100%; transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1); }

.state-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.state-legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-secondary);
}

.state-legend-item strong {
  color: var(--text);
  font-weight: 600;
  margin-left: 2px;
}

.state-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.retention-display { text-align: center; padding: 12px 0 6px; }

.retention-value {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.035em;
  color: var(--primary);
  line-height: 1;
}

.retention-pct {
  font-size: 26px;
  color: var(--text-secondary);
  margin-left: 4px;
  font-weight: 500;
}

.retention-sub {
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 14px;
}

.empty-chart {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
  padding: 30px 0;
}

/* =========================================================
   Toast
   ========================================================= */

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 12px 20px;
  border-radius: 980px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  animation: toastIn 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* =========================================================
   Gamification — Daily Goal + Session-End
   ========================================================= */

.progress-ring {
  display: block;
}

.progress-ring-bg {
  stroke: var(--bg-elevated);
}

.progress-ring-fill {
  transition: stroke-dashoffset 800ms cubic-bezier(0.4, 0, 0.2, 1);
  stroke: var(--primary);
}

.progress-ring-fill.met {
  stroke: var(--success);
}

.daily-goal-card {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 20px 24px;
}

.goal-ring-wrap {
  position: relative;
  flex-shrink: 0;
  width: 96px;
  height: 96px;
}

.goal-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  pointer-events: none;
}

.goal-ring-text strong {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1;
}

.goal-ring-text .goal-ring-sub {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 2px;
}

.goal-info { flex: 1; min-width: 0; }

.goal-info strong {
  font-size: 16px;
  font-weight: 600;
  display: block;
  margin-bottom: 3px;
  letter-spacing: -0.01em;
}

.goal-info p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

.goal-info p.met {
  color: var(--success);
  font-weight: 500;
}

/* Session-End-Screen */

.session-stats-row {
  display: flex;
  gap: 16px;
  margin: 18px 0 10px;
  padding: 16px 22px;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
}

.session-stat {
  text-align: center;
  flex: 1;
  min-width: 0;
}

.session-stat-value {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-hover) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
}

.session-stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
  font-weight: 500;
}

.session-meta-line {
  font-size: 13px;
  margin-top: 6px;
  text-align: center;
}

.session-meta-line.met {
  color: var(--success);
  font-weight: 500;
}

/* =========================================================
   Aussprache — Speaker-Button auf den Karten
   ========================================================= */

.speaker-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  transition: all var(--transition);
  z-index: 2;
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
  -webkit-tap-highlight-color: transparent;
}

.speaker-btn:hover {
  color: var(--primary);
  transform: scale(1.06);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 4px 12px rgba(0, 113, 227, 0.18);
}

.speaker-btn:active { transform: scale(0.96); }

.speaker-btn.playing {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  animation: speakerPulse 1.4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes speakerPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 113, 227, 0.40); }
  50%      { box-shadow: 0 0 0 9px rgba(0, 113, 227, 0); }
}

/* Im Preview-Modal etwas kleiner */
.preview-flashcard-face .speaker-btn {
  width: 32px;
  height: 32px;
  top: 10px;
  right: 10px;
}

/* Zwei-spaltige Modal-Form-Row */
.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-row-2 > label { margin-bottom: 0; }

@media (max-width: 480px) {
  .form-row-2 { grid-template-columns: 1fr; }
}

/* =========================================================
   Card Preview Modal
   ========================================================= */

.modal-preview-modal {
  max-width: 620px;
  padding: 0;
  overflow: hidden;
}

.preview-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--glass-border);
}

.preview-meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.preview-tags {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-width: 0;
  overflow: hidden;
}

.preview-tags .card-tag {
  font-size: 11px;
}

.preview-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.preview-close:hover {
  background: rgba(0, 0, 0, 0.06);
  color: var(--text);
}

[data-theme="dark"] .preview-close:hover,
:root:not([data-theme="light"]) .preview-close:hover {
  background: rgba(255, 255, 255, 0.10);
}

.preview-flashcard {
  perspective: 1600px;
  width: calc(100% - 32px);
  height: 280px;
  margin: 16px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.preview-flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 600ms cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.preview-flashcard.flipped .preview-flashcard-inner {
  transform: rotateY(180deg);
}

.preview-flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px;
  text-align: center;
  box-shadow:
    0 1px 0 var(--glass-edge) inset,
    0 -0.5px 0 rgba(0, 0, 0, 0.04) inset,
    0 8px 24px rgba(0, 0, 0, 0.06);
}

.preview-back { transform: rotateY(180deg); }

.preview-content {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.35;
  white-space: pre-wrap;
  word-break: break-word;
  max-width: 100%;
}

.preview-hint {
  position: absolute;
  bottom: 14px;
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.preview-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 12px 16px 16px;
  border-top: 1px solid var(--glass-border);
}

.preview-actions .btn-tertiary {
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.preview-actions .btn-tertiary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.preview-actions .btn-secondary {
  font-size: 13px;
  padding: 8px 14px;
}

/* =========================================================
   Tag-Hub
   ========================================================= */

.taghub-controls {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: center;
}

.taghub-controls input[type="search"] {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: 980px;
  padding: 9px 16px;
  font: inherit;
  color: var(--text);
  outline: none;
  transition: all var(--transition);
}

.taghub-controls input[type="search"]:focus {
  border-color: var(--primary);
  background: var(--bg-card);
}

.taghub-new-row {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  align-items: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
}

.taghub-new-row input {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font: inherit;
  color: var(--text);
  outline: none;
}

.taghub-new-row input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.10);
}

.taghub-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.taghub-tag {
  background: var(--bg-elevated);
  color: var(--text);
  border: 0.5px solid var(--glass-border);
  font: inherit;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 980px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition);
}

.taghub-tag:hover {
  background: var(--bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.taghub-tag.active {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow:
    0 0.5px 0 rgba(255, 255, 255, 0.55) inset,
    0 4px 12px rgba(0, 113, 227, 0.30);
}

.taghub-tag-count {
  font-size: 11px;
  opacity: 0.7;
  font-weight: 500;
}

.taghub-tag.unused {
  border-style: dashed;
  border-color: var(--border-strong);
  color: var(--text-secondary);
}

.taghub-tag.unused .taghub-tag-count {
  font-style: italic;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.taghub-tag-delete {
  background: transparent;
  border: none;
  color: inherit;
  opacity: 0.4;
  cursor: pointer;
  margin-left: 2px;
  margin-right: -4px;
  padding: 0;
  font-size: 14px;
  line-height: 1;
  display: inline-flex;
  width: 16px;
  height: 16px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.taghub-tag-delete:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.10);
}

[data-theme="dark"] .taghub-tag-delete:hover,
:root:not([data-theme="light"]) .taghub-tag-delete:hover {
  background: rgba(255, 255, 255, 0.10);
}

.taghub-filter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.taghub-card-list {
  display: flex;
  flex-direction: column;
}

.taghub-card-row {
  display: flex;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  gap: 12px;
  transition: padding-left var(--transition);
}

.taghub-card-row:last-child { border-bottom: none; }

.taghub-card-row:hover {
  padding-left: 8px;
}

.taghub-card-row:hover .taghub-card-front {
  color: var(--primary);
}

.taghub-card-content {
  flex: 1;
  min-width: 0;
}

.taghub-card-front {
  font-weight: 500;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition);
}

.taghub-card-back {
  color: var(--text-secondary);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.taghub-card-deck {
  font-size: 11px;
  color: var(--text-tertiary);
  background: var(--bg-elevated);
  padding: 3px 10px;
  border-radius: 980px;
  white-space: nowrap;
  flex-shrink: 0;
  border: 0.5px solid var(--glass-border);
}

/* =========================================================
   Import-Dialog (CSV/TSV/Clipboard)
   ========================================================= */

.import-dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 16px;
  background: rgba(0, 113, 227, 0.03);
  color: var(--text-secondary);
}

.import-dropzone:hover {
  border-color: var(--primary);
  background: rgba(0, 113, 227, 0.06);
  color: var(--text);
}

.import-dropzone.dragover {
  border-color: var(--primary);
  background: rgba(0, 113, 227, 0.10);
  color: var(--primary);
  transform: scale(1.01);
}

.import-dropzone svg { color: var(--primary); flex-shrink: 0; }

.import-dropzone-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 14px;
}

.import-dropzone-label strong {
  font-weight: 600;
  color: var(--text);
}

.import-dropzone-label span {
  font-size: 12px;
  color: var(--text-secondary);
}

.import-divider {
  text-align: center;
  position: relative;
  margin: 8px 0 12px;
  color: var(--text-tertiary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.import-divider::before,
.import-divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: calc(50% - 60px);
  height: 1px;
  background: var(--border);
}

.import-divider::before { left: 0; }
.import-divider::after  { right: 0; }

#import-text-input {
  font-family: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 12px;
  white-space: pre;
  overflow-x: auto;
  resize: vertical;
}

.import-options {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 12px;
  margin-bottom: 16px;
}

.import-option {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
}

.import-option select {
  font: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  margin: 0;
  cursor: pointer;
}

.import-option-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  margin: 0;
  margin-top: 16px;
}

.import-option-inline input[type="checkbox"] {
  margin: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.import-preview {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 16px;
}

.import-preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
}

.import-preview-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}

.import-preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 13px;
  line-height: 1.4;
}

.import-preview-card strong { font-weight: 600; }

.import-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-top: 4px;
}

.import-preview-more {
  font-size: 12px;
  color: var(--text-tertiary);
  text-align: center;
  padding: 6px;
}

/* =========================================================
   Sync-Indicator (Topbar)
   ========================================================= */

.sync-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  flex-shrink: 0;
  transition: background 200ms ease;
  margin-right: 4px;
}

.sync-indicator.syncing {
  background: var(--primary);
  animation: sync-pulse 1.4s ease-in-out infinite;
}

.sync-indicator.error    { background: var(--danger); }
.sync-indicator.offline  { background: var(--text-tertiary); }

@keyframes sync-pulse {
  0%, 100% { opacity: 1;   transform: scale(1); }
  50%      { opacity: 0.5; transform: scale(1.4); }
}

/* =========================================================
   Command Palette (Cmd+K)
   ========================================================= */

.modal-overlay.modal-cmdk-overlay {
  align-items: flex-start;
  padding-top: 14vh;
}

.modal-cmdk {
  max-width: 560px;
  padding: 0;
  overflow: hidden;
}

.cmdk-input-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}

.cmdk-input-wrapper svg { color: var(--text-tertiary); flex-shrink: 0; }

.cmdk-input-wrapper input[type="search"] {
  flex: 1;
  background: transparent !important;
  border: none !important;
  font: inherit;
  font-size: 15px;
  color: var(--text);
  outline: none;
  padding: 4px !important;
  margin: 0 !important;
  -webkit-appearance: none;
}

.cmdk-input-wrapper input[type="search"]::-webkit-search-cancel-button { display: none; }

.cmdk-results {
  max-height: 380px;
  overflow-y: auto;
  padding: 6px;
}

.cmdk-section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  padding: 10px 12px 4px;
}

.cmdk-result {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--transition);
}

.cmdk-result:hover, .cmdk-result.active {
  background: var(--bg-hover);
}

.cmdk-result.active {
  background: rgba(0, 113, 227, 0.10);
}

[data-theme="dark"] .cmdk-result.active,
:root:not([data-theme="light"]) .cmdk-result.active {
  background: rgba(10, 132, 255, 0.16);
}

.cmdk-result-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.cmdk-result-content {
  flex: 1;
  min-width: 0;
}

.cmdk-result-label {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}

.cmdk-result-sublabel {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cmdk-result-shortcut {
  font-size: 11px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.cmdk-empty {
  padding: 36px 20px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* =========================================================
   Keyboard-Help-Overlay
   ========================================================= */

.kbd {
  display: inline-block;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 11px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", system-ui, sans-serif;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0;
  line-height: 1.4;
}

.kbd-section h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 16px;
  margin-bottom: 6px;
}

.kbd-section h4:first-child { margin-top: 0; }

.kbd-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.kbd-row:last-child { border-bottom: none; }

.kbd-desc {
  color: var(--text-secondary);
  font-size: 13px;
  text-align: right;
}

/* =========================================================
   Heatmap
   ========================================================= */

.heatmap-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.heatmap-container svg {
  width: 100%;
  max-width: 720px;
  height: auto;
  display: block;
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-tertiary);
  align-self: flex-end;
}

.heatmap-legend-cell {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  border: 1px solid var(--border);
}

/* =========================================================
   Undo-Button (Study)
   ========================================================= */

.study-progress-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 8px;
}

.study-progress-row #study-progress-text { margin-bottom: 0; }

.undo-inline-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px 4px 8px;
  border-radius: 980px;
  font: inherit;
  font-size: 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition);
  white-space: nowrap;
}

.undo-inline-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--border-strong);
}

/* =========================================================
   Confetti-Canvas
   ========================================================= */

.confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  width: 100vw;
  height: 100vh;
}

/* =========================================================
   Liquid-Glass Aesthetic (iOS-26-inspired)
   --------------------------------------------------------
   Drei Bausteine:
   1. Farbige Page-Background-Blobs (geben dem Glas Inhalt
      zum Brechen)
   2. Translucent Surfaces mit backdrop-filter
   3. Specular-Highlights (helle Innenkante oben) +
      multi-layered shadows
   ========================================================= */

:root {
  --glass-bg-light:        rgba(255, 255, 255, 0.62);
  --glass-bg-light-strong: rgba(255, 255, 255, 0.74);
  --glass-border-light:    rgba(255, 255, 255, 0.55);
  --glass-edge-light:      rgba(255, 255, 255, 0.85);

  --glass-bg-dark:         rgba(40, 40, 46, 0.55);
  --glass-bg-dark-strong:  rgba(48, 48, 54, 0.72);
  --glass-border-dark:     rgba(255, 255, 255, 0.10);
  --glass-edge-dark:       rgba(255, 255, 255, 0.16);

  --glass-blur:            blur(24px) saturate(180%);
  --glass-blur-strong:     blur(36px) saturate(200%);

  --glass-bg:              var(--glass-bg-light);
  --glass-bg-strong:       var(--glass-bg-light-strong);
  --glass-border:          var(--glass-border-light);
  --glass-edge:            var(--glass-edge-light);
}

[data-theme="dark"] {
  --glass-bg:              var(--glass-bg-dark);
  --glass-bg-strong:       var(--glass-bg-dark-strong);
  --glass-border:          var(--glass-border-dark);
  --glass-edge:            var(--glass-edge-dark);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --glass-bg:              var(--glass-bg-dark);
    --glass-bg-strong:       var(--glass-bg-dark-strong);
    --glass-border:          var(--glass-border-dark);
    --glass-edge:            var(--glass-edge-dark);
  }
}

/* ----- Page-Background: drei diffuse Farbverläufe ----- */

body::before {
  content: "";
  position: fixed;
  inset: -10vh -10vw;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 45% at 12% 8%,  rgba(0, 113, 227, 0.10), transparent 60%),
    radial-gradient(ellipse 40% 55% at 88% 22%, rgba(175, 82, 222, 0.08), transparent 65%),
    radial-gradient(ellipse 60% 50% at 50% 95%, rgba(52, 199, 89, 0.06),  transparent 60%),
    radial-gradient(ellipse 35% 30% at 80% 75%, rgba(255, 149, 0, 0.05),  transparent 65%);
  filter: blur(40px);
}

[data-theme="dark"] body::before,
:root:not([data-theme="light"]) body::before {
  background:
    radial-gradient(ellipse 55% 45% at 12% 8%,  rgba(10, 132, 255, 0.18), transparent 60%),
    radial-gradient(ellipse 40% 55% at 88% 22%, rgba(191, 90, 242, 0.14), transparent 65%),
    radial-gradient(ellipse 60% 50% at 50% 95%, rgba(48, 209, 88, 0.10),  transparent 60%),
    radial-gradient(ellipse 35% 30% at 80% 75%, rgba(255, 159, 10, 0.08), transparent 65%);
}

/* ----- Topbar: stronger glass + edge highlight ----- */

.topbar {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 1px 0 rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .topbar,
:root:not([data-theme="light"]) .topbar {
  box-shadow:
    0 0.5px 0 var(--glass-edge-dark) inset,
    0 1px 0 rgba(0, 0, 0, 0.4);
}

/* ----- Modals as glass panels ----- */

.modal-overlay {
  background: rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.modal {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
  border: 1px solid var(--glass-border);
  border-radius: 22px;
  box-shadow:
    0 1.5px 0 var(--glass-edge) inset,                /* top edge highlight */
    0 -0.5px 0 rgba(0, 0, 0, 0.04) inset,
    0 30px 80px rgba(0, 0, 0, 0.18),
    0 8px 24px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .modal,
:root:not([data-theme="light"]) .modal {
  box-shadow:
    0 1.5px 0 var(--glass-edge-dark) inset,
    0 0 0 1px rgba(0, 0, 0, 0.4) inset,
    0 30px 80px rgba(0, 0, 0, 0.65),
    0 8px 24px rgba(0, 0, 0, 0.4);
}

/* ----- FAB als accentuated glass orb ----- */

.fab {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.28) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow:
    0 1.5px 0 rgba(255, 255, 255, 0.55) inset,
    0 -1px 0 rgba(0, 0, 0, 0.18) inset,
    0 12px 28px rgba(0, 113, 227, 0.40),
    0 4px 12px rgba(0, 0, 0, 0.08);
  border: 0.5px solid rgba(255, 255, 255, 0.30);
}

.fab:hover {
  box-shadow:
    0 1.5px 0 rgba(255, 255, 255, 0.65) inset,
    0 -1px 0 rgba(0, 0, 0, 0.18) inset,
    0 16px 36px rgba(0, 113, 227, 0.50),
    0 4px 12px rgba(0, 0, 0, 0.10);
}

/* ----- Flashcard as premium glass surface ----- */

.flashcard-face {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
  border: 1px solid var(--glass-border);
  border-radius: 28px;
  box-shadow:
    0 1.5px 0 var(--glass-edge) inset,
    0 -0.5px 0 rgba(0, 0, 0, 0.04) inset,
    0 24px 64px rgba(0, 0, 0, 0.10),
    0 4px 12px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .flashcard-face,
:root:not([data-theme="light"]) .flashcard-face {
  box-shadow:
    0 1.5px 0 var(--glass-edge-dark) inset,
    0 0 0 1px rgba(0, 0, 0, 0.5) inset,
    0 24px 64px rgba(0, 0, 0, 0.6);
}

/* ----- Toast als floating glass pill ----- */

.toast {
  background: var(--glass-bg-strong);
  color: var(--text);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 1px 0 var(--glass-edge) inset,
    0 12px 32px rgba(0, 0, 0, 0.14),
    0 4px 8px rgba(0, 0, 0, 0.06);
}

/* ----- Command-Palette als Flagship-Glas ----- */

.modal-cmdk {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-blur-strong);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 1.5px 0 var(--glass-edge) inset,
    0 32px 96px rgba(0, 0, 0, 0.22),
    0 12px 32px rgba(0, 0, 0, 0.08);
}

.cmdk-input-wrapper {
  border-bottom: 1px solid var(--glass-border);
}

/* ----- Buttons: subtile Specular-Highlights ----- */

.btn-primary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary);
  box-shadow:
    0 0.5px 0 rgba(255, 255, 255, 0.45) inset,
    0 -0.5px 0 rgba(0, 0, 0, 0.12) inset,
    0 1px 2px rgba(0, 113, 227, 0.18);
}

.btn-primary:hover {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary-hover);
  box-shadow:
    0 0.5px 0 rgba(255, 255, 255, 0.55) inset,
    0 -0.5px 0 rgba(0, 0, 0, 0.12) inset,
    0 4px 12px rgba(0, 113, 227, 0.28);
}

.btn-secondary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.45) 0%, rgba(255, 255, 255, 0) 60%),
    var(--bg-elevated);
  border: 0.5px solid var(--border-strong);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 1px 2px rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .btn-secondary,
:root:not([data-theme="light"]) .btn-secondary {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0) 60%),
    var(--bg-elevated);
}

/* ----- Rating-Buttons ----- */

.rate-btn {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 2px 6px rgba(0, 0, 0, 0.04);
}

.rate-btn:hover {
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 6px 16px rgba(0, 0, 0, 0.10);
}

/* ----- Tree-Container (Decks) ----- */

.decks-tree,
.cards-list,
.subdecks-list {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 4px 16px rgba(0, 0, 0, 0.05);
}

/* ----- Inputs: subtile Glasoptik ----- */

.modal input[type="text"],
.modal input[type="password"],
.modal input[type="number"],
.modal textarea,
.modal select {
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 10px;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] .modal input,
[data-theme="dark"] .modal textarea,
[data-theme="dark"] .modal select,
:root:not([data-theme="light"]) .modal input,
:root:not([data-theme="light"]) .modal textarea,
:root:not([data-theme="light"]) .modal select {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.08);
}

.modal input:focus,
.modal textarea:focus,
.modal select:focus {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-color: var(--primary);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 0 0 4px rgba(0, 113, 227, 0.12);
}

/* Card-Search im Deck-Detail */
#card-search {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
}

#card-search:focus {
  background: var(--glass-bg-strong);
  border-color: var(--primary);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 0 0 4px rgba(0, 113, 227, 0.10);
}

/* ----- Tag-Pills mit dezentem Glaseffekt ----- */

.tag-pill {
  backdrop-filter: blur(10px) saturate(150%);
  -webkit-backdrop-filter: blur(10px) saturate(150%);
  border: 0.5px solid rgba(0, 113, 227, 0.20);
  box-shadow: 0 0.5px 0 rgba(255, 255, 255, 0.45) inset;
}

[data-theme="dark"] .tag-pill,
:root:not([data-theme="light"]) .tag-pill {
  border-color: rgba(10, 132, 255, 0.28);
  box-shadow: 0 0.5px 0 rgba(255, 255, 255, 0.10) inset;
}

.tag-chip {
  background: var(--glass-bg);
  backdrop-filter: blur(10px) saturate(160%);
  -webkit-backdrop-filter: blur(10px) saturate(160%);
  border: 0.5px solid var(--glass-border);
}

.tag-chip.active {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary);
  border-color: var(--primary);
  box-shadow:
    0 0.5px 0 rgba(255, 255, 255, 0.55) inset,
    0 4px 12px rgba(0, 113, 227, 0.28);
}

/* ----- KPI-Cards & Chart-Cards ----- */

.kpi-card,
.chart-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow:
    0 0.5px 0 var(--glass-edge) inset,
    0 4px 16px rgba(0, 0, 0, 0.04);
}

/* ----- Cloze-Spans aufpoliert ----- */

.cloze-blank {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px dashed rgba(0, 0, 0, 0.18);
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
}

[data-theme="dark"] .cloze-blank,
:root:not([data-theme="light"]) .cloze-blank {
  border-color: rgba(255, 255, 255, 0.20);
}

.cloze-active {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24) 0%, rgba(255, 255, 255, 0) 60%),
    rgba(255, 149, 0, 0.22);
  box-shadow: 0 0.5px 0 rgba(255, 255, 255, 0.45) inset;
}

/* ----- Sync-Indicator: kleines Glow für Status ----- */

.sync-indicator {
  box-shadow: 0 0 0 0.5px rgba(0, 0, 0, 0.04);
}
.sync-indicator.synced  { box-shadow: 0 0 8px rgba(52, 199, 89, 0.6); }
.sync-indicator.syncing { box-shadow: 0 0 12px rgba(0, 113, 227, 0.7); }
.sync-indicator.error   { box-shadow: 0 0 10px rgba(255, 59, 48, 0.7); }

/* ----- Undo-Button glass ----- */

.undo-inline-btn {
  background: var(--glass-bg);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  border: 0.5px solid var(--glass-border);
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
}

/* ----- Hover auf Rows: KEIN nested backdrop-filter (würde sich
        innerhalb einer schon geblurrten Glas-Surface aufheben) ----- */

.deck-tree-row,
.card-row,
.subdeck-row,
.cmdk-result {
  transition: background var(--transition);
}

.deck-tree-row:hover,
.card-row:hover,
.subdeck-row:hover {
  background: rgba(255, 255, 255, 0.55);
}

[data-theme="dark"] .deck-tree-row:hover,
[data-theme="dark"] .card-row:hover,
[data-theme="dark"] .subdeck-row:hover,
:root:not([data-theme="light"]) .deck-tree-row:hover,
:root:not([data-theme="light"]) .card-row:hover,
:root:not([data-theme="light"]) .subdeck-row:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* ----- Topbar-Icons: kein nested blur (Topbar hat schon einen) ----- */

.icon-btn:hover {
  background: rgba(0, 0, 0, 0.06);
  box-shadow: 0 0.5px 0 var(--glass-edge) inset;
}

[data-theme="dark"] .icon-btn:hover,
:root:not([data-theme="light"]) .icon-btn:hover {
  background: rgba(255, 255, 255, 0.10);
}

/* ----- KPI-Zahlen mit Glas-Tiefe (subtiler Gradient) ----- */

.kpi-value {
  background: linear-gradient(180deg, var(--text) 0%, var(--text-secondary) 140%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--text); /* Fallback */
}

/* ----- Progress-Bar mit Highlight-Streifen ----- */

.progress-bar {
  background: rgba(0, 0, 0, 0.06);
  box-shadow: inset 0 0.5px 0 rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .progress-bar,
:root:not([data-theme="light"]) .progress-bar {
  background: rgba(255, 255, 255, 0.08);
}

#progress-fill {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.45) 0%, rgba(255, 255, 255, 0) 50%),
    var(--primary);
  box-shadow:
    0 0.5px 0 rgba(255, 255, 255, 0.55) inset,
    0 0 8px rgba(0, 113, 227, 0.40);
}

/* ----- Sanftes Drift auf den Background-Blobs (verstärkt den
        Liquid-Glass-Eindruck — Refraktion verschiebt sich leicht) ----- */

@keyframes glassDrift {
  0%, 100% { transform: translate(0, 0)         scale(1); }
  33%      { transform: translate(2vw, -1vh)    scale(1.04); }
  66%      { transform: translate(-1.5vw, 1vh)  scale(0.98); }
}

body::before {
  animation: glassDrift 28s ease-in-out infinite;
  will-change: transform;
}


/* ----- Empty-State zentriert + dezent ----- */

.empty-state {
  background: transparent;
}

/* ----- Performance-Hinweis: Reduce motion ----- */

@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
  .sync-indicator.syncing { animation: none; }
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 600px) {
  .hero h2 { font-size: 26px; }
  .container { padding: 20px 16px 96px; }
  .flashcard { height: 300px; }
  .card-content { font-size: 22px; }
  .flashcard-face { padding: 24px; }
  .rating-buttons { grid-template-columns: repeat(2, 1fr); }
  #card-search { width: 140px; }
  .action-row .btn-tertiary { margin-left: 0; }
}