/* ============================================================
   Cardlish Learn — Design System v0.1
   Premium flashcard UI for elementary school students
   ============================================================ */

/* ── Google Font ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&display=swap');

/* ── CSS Custom Properties ───────────────────────────────── */
:root {
  /* Background */
  --bg-from: #fef9ef;
  --bg-to: #f0e6ff;
  --bg-gradient: linear-gradient(135deg, var(--bg-from) 0%, var(--bg-to) 100%);

  /* Surfaces */
  --card-bg: #ffffff;
  --card-shadow: 0 8px 40px rgba(0, 0, 0, 0.08), 0 2px 12px rgba(0, 0, 0, 0.04);
  --card-shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.12), 0 4px 16px rgba(0, 0, 0, 0.06);

  /* Primary accent — green for focus / active */
  --accent-green: #22c55e;
  --accent-green-light: #dcfce7;
  --accent-green-text: #16a34a;
  --accent-green-glow: rgba(34, 197, 94, 0.15);

  /* Secondary accents */
  --accent-blue: #60a5fa;
  --accent-blue-light: #dbeafe;
  --accent-blue-text: #2563eb;

  --accent-orange: #fb923c;
  --accent-orange-light: #ffedd5;
  --accent-orange-text: #ea580c;

  --accent-purple: #a78bfa;
  --accent-purple-light: #ede9fe;
  --accent-purple-text: #7c3aed;

  /* Text */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Misc */
  --progress-track: #e2e8f0;
  --progress-fill: linear-gradient(90deg, #22c55e, #4ade80);
  --border-radius-sm: 12px;
  --border-radius-md: 18px;
  --border-radius-lg: 22px;
  --border-radius-xl: 28px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
  --font-family: 'Nunito', 'Segoe UI', system-ui, -apple-system, sans-serif;

  /* Layout */
  --header-height: 56px;
  --status-bar-height: 40px;
}

/* ── Reset & Base ────────────────────────────────────────── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--bg-gradient);
  background-attachment: fixed;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* Subtle animated background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.06) 0%,
    rgba(167, 139, 250, 0.06) 33%,
    rgba(251, 146, 60, 0.04) 66%,
    rgba(34, 197, 94, 0.05) 100%
  );
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
  z-index: -1;
  pointer-events: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* ── Animations ──────────────────────────────────────────── */
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes bounceIn {
  0%   { transform: scale(0.95); opacity: 0.7; }
  60%  { transform: scale(1.02); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
  0%   { opacity: 1; }
  50%  { opacity: 0.7; }
  100% { opacity: 1; }
}

@keyframes slideIn {
  0%   { transform: translateX(20px); opacity: 0; }
  100% { transform: translateX(0); opacity: 1; }
}

@keyframes spin {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  0%   { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes floatEmoji {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25%      { transform: translateY(-6px) rotate(-3deg); }
  75%      { transform: translateY(3px) rotate(3deg); }
}

/* ── Header (hidden — maximise card area) ───────────────── */
.app-header {
  display: none;
}

.card-counter {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
}

/* ── Progress Bar ────────────────────────────────────────── */
.progress-bar-container {
  height: 6px;
  background: var(--progress-track);
  position: sticky;
  top: 0;
  z-index: 99;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--progress-fill);
  border-radius: 0 8px 8px 0;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 30px;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4));
  border-radius: 0 8px 8px 0;
}

/* ── Main Content ────────────────────────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 12px 4px;
  min-height: 0;
}

/* ── 3D Card ─────────────────────────────────────────────── */
.card-container {
  perspective: 2000px;
  width: 100%;
  max-width: 600px;
  aspect-ratio: 3 / 4;
  max-height: 65vh;
  cursor: pointer;
  position: relative;
}

.card-flipper {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

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

.card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
}

.card-front {
  z-index: 2;
}

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

.card-image-shell {
  width: 100%;
  height: 100%;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  background: var(--card-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-image-shell img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--border-radius-xl);
  user-select: none;
  -webkit-user-drag: none;
}

/* Card transition animations */
@keyframes slideInFromRight {
  0% {
    transform: translateX(80px);
    opacity: 0;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideInFromLeft {
  0% {
    transform: translateX(-80px);
    opacity: 0;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fadeScaleIn {
  0% {
    transform: scale(0.96);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.card-enter-next {
  animation: slideInFromRight 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.card-enter-prev {
  animation: slideInFromLeft 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.card-enter-fade {
  animation: fadeScaleIn 0.3s ease-out forwards;
}

/* ── Card Info ───────────────────────────────────────────── */
.card-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 6px;
  padding: 2px 0;
  animation: slideIn 0.3s ease;
}

.card-label {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-side {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ── Navigation Arrow Buttons ────────────────────────────── */
.nav-arrow-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 95px;
  height: 95px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 3px solid rgba(96, 165, 250, 0.3);
  color: var(--accent-blue-text);
  font-size: 40px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(96, 165, 250, 0.1);
  transition: all var(--transition-fast);
  flex-shrink: 0;
  z-index: 10;
}

.nav-arrow-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent-blue);
  background: var(--accent-blue-light);
  box-shadow: 0 8px 24px rgba(96, 165, 250, 0.25);
}

.nav-arrow-btn:active {
  transform: scale(0.9);
}

.nav-arrow-btn:focus-visible {
  outline: 3px solid var(--accent-blue);
  outline-offset: 4px;
}

/* ── Audio Speaker Button ─────────────────────────────────── */
.audio-speaker-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 2px solid rgba(124, 140, 240, 0.15);
  font-size: 24px;
  color: var(--text-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-fast);
  margin-left: 12px;
  line-height: 1;
  padding: 0;
  vertical-align: middle;
}

.audio-speaker-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent-green);
  box-shadow: 0 6px 18px rgba(34, 197, 94, 0.2);
}

.audio-speaker-btn:active {
  transform: scale(0.95);
}

.audio-speaker-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: var(--progress-track);
  box-shadow: none;
}

/* Pulsing glow animation for when audio is playing */
@keyframes audioPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(34, 197, 94, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
  }
}

.audio-speaker-btn.audio-playing {
  animation: audioPulse 1.5s infinite;
  border-color: var(--accent-green);
  background: var(--accent-green-light);
}

/* ── Focus System ────────────────────────────────────────── */
.focusable:focus-visible,
.focusable[data-active="true"] {
  outline: 5px solid var(--accent-green);
  outline-offset: 5px;
  transform: scale(1.04);
  box-shadow: 0 0 0 10px var(--accent-green-glow);
  transition: all var(--transition-fast);
  z-index: 10;
}

/* Avoid double-scaling on hover + focus */
.focusable[data-active="true"]:hover {
  transform: scale(1.06);
}

.focusable[data-active="true"]:active {
  transform: scale(0.97) !important;
}

/* ── Status Bar (hidden — maximise card area) ────────────── */
.status-bar {
  display: none;
}

/* ── Floating Gallery Button ─────────────────────────────── */
.gallery-fab {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-purple-light);
  border: 1px solid rgba(124, 58, 237, 0.25);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.15);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.gallery-fab:hover {
  transform: scale(1.1);
  background: #ddd6fe;
  box-shadow: 0 6px 16px rgba(124, 58, 237, 0.25);
}

/* ── Pointer Indicator ───────────────────────────────────── */
.pointer-indicator {
  position: fixed;
  width: 34px;
  height: 34px;
  border: 4px solid var(--accent-green);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.1s ease;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 6px var(--accent-green-glow);
  will-change: left, top;
}

.pointer-indicator.visible {
  opacity: 1;
}

/* Hide pointer on touch devices */
@media (hover: none) {
  .pointer-indicator {
    display: none !important;
  }
}

/* ── Loading Overlay ─────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(254, 249, 239, 0.95);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  z-index: 10000;
  transition: opacity 0.4s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 56px;
  height: 56px;
  border: 6px solid var(--progress-track);
  border-top-color: var(--accent-green);
  border-right-color: var(--accent-purple);
  border-radius: 50%;
  animation: spin 0.9s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.loading-overlay p {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-secondary);
  animation: pulse 2s ease-in-out infinite;
}

/* ── Error State ─────────────────────────────────────────── */
.error-message {
  text-align: center;
  padding: 24px;
  max-width: 400px;
  margin: auto;
}

.error-message .error-emoji {
  font-size: 48px;
  margin-bottom: 12px;
}

.error-message .error-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

/* ── Mobile (<640px) ─────────────────────────────────────── */
@media (max-width: 639px) {
  html {
    font-size: 16px;
  }

  .app-header {
    padding: 0 12px;
    height: 50px;
  }

  .app-title {
    font-size: 17px;
  }

  .logo {
    font-size: 24px;
  }

  .card-counter {
    font-size: 13px;
    padding: 3px 10px;
  }

  .main-content {
    padding: 6px 8px 4px;
  }

  .card-container {
    width: 100%;
    max-width: 480px;
    max-height: 78vh;
  }



  .card-info {
    margin-top: 6px;
  }

  .card-label {
    font-size: 14px;
  }

  .card-side {
    font-size: 13px;
  }

  .status-bar {
    font-size: 13px;
    padding: 6px 12px;
  }

  :root {
    --header-height: 50px;
  }
}

/* ── Tablet (640px – 1024px) ─────────────────────────────── */
@media (min-width: 640px) and (max-width: 1024px) {
  .card-container {
    width: 100%;
    max-width: 620px;
    max-height: 78vh;
  }


}

/* ── Desktop (>1024px) ───────────────────────────────────── */
@media (min-width: 1025px) {
  html {
    font-size: 20px;
  }

  .app-header {
    padding: 0 32px;
    height: 62px;
  }

  .app-title {
    font-size: 22px;
  }

  .logo {
    font-size: 30px;
  }

  .card-counter {
    font-size: 16px;
    padding: 5px 16px;
  }

  .card-container {
    width: 100%;
    max-width: 700px;
    max-height: 80vh;
  }



  .card-label {
    font-size: 18px;
  }

  .card-side {
    font-size: 15px;
  }

  .status-bar {
    font-size: 15px;
  }

  :root {
    --header-height: 62px;
  }
}

/* ── TV / Large screens (>1400px) ────────────────────────── */
@media (min-width: 1400px) {
  html {
    font-size: 22px;
  }

  .app-header {
    padding: 0 48px;
    height: 72px;
  }

  .app-title {
    font-size: 26px;
  }

  .logo {
    font-size: 36px;
  }

  .card-counter {
    font-size: 18px;
    padding: 6px 20px;
  }

  .card-container {
    width: 100%;
    max-width: 820px;
    max-height: 82vh;
  }



  .card-label {
    font-size: 22px;
  }

  .card-side {
    font-size: 17px;
  }

  .status-bar {
    font-size: 17px;
    padding: 10px 24px;
  }

  .focusable:focus-visible,
  .focusable[data-active="true"] {
    outline-width: 6px;
    outline-offset: 7px;
    box-shadow: 0 0 0 14px var(--accent-green-glow);
  }

  :root {
    --header-height: 72px;
  }
}

/* ============================================================
   Vocabulary Display Feature & Side Layout
   ============================================================ */
.study-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 1100px;
  gap: 28px;
  margin-top: 2px;
  animation: fadeIn var(--transition-normal);
}

.card-container-wrapper {
  flex: 1;
  max-width: 600px;
  display: flex;
  justify-content: center;
}

.vocab-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 200px;
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

.vocab-left {
  align-items: flex-end;
}

.vocab-right {
  align-items: flex-start;
}

/* ── Example Sentences ───────────────────────────────────── */
.sentences-container {
  width: 90%;
  max-width: 800px;
  margin: 12px auto 0;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 2px solid rgba(124, 140, 240, 0.2);
  border-radius: 20px;
  padding: 16px 24px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center; /* Center rows horizontally */
  gap: 14px;
  transition: all var(--transition-normal);
}

.sentence-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 6px 0;
  max-width: 100%;
}

.sentence-bullet {
  font-size: 20px;
  user-select: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.sentence-text-group {
  display: flex;
  flex-direction: column;
  align-items: center; /* Center English and Vietnamese text */
  text-align: center;
  gap: 6px;
  min-width: 0;
}

.sentence-en {
  font-size: 19px; /* Enlarged font size */
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  word-wrap: break-word;
}

.sentence-en b {
  color: var(--accent-blue-text);
  background: var(--accent-blue-light);
  padding: 2px 8px;
  border-radius: 8px;
  font-weight: 800;
}

.sentence-vi {
  font-size: 15.5px; /* Enlarged font size */
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.35;
}

.sentence-speaker-btn {
  background: rgba(255, 255, 255, 0.9);
  border: 1.5px solid #e2e8f0;
  border-radius: 50%;
  width: 34px; /* Enlarged width/height */
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.sentence-speaker-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent-blue);
  background: var(--accent-blue-light);
  color: var(--accent-blue-text);
}

.sentence-speaker-btn:active {
  transform: scale(0.95);
}

/* Responsive sizes for sentences */
@media (max-width: 959px) {
  .sentences-container {
    padding: 12px 16px;
    margin: 16px auto 0;
    width: 95%;
  }
  .sentence-row {
    gap: 10px;
  }
  .sentence-bullet {
    font-size: 16px;
  }
  .sentence-en {
    font-size: 16px;
  }
  .sentence-vi {
    font-size: 13.5px;
  }
  .sentence-speaker-btn {
    width: 30px;
    height: 30px;
    font-size: 12px;
  }
}

.vocab-word-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--card-bg);
  border: 2px solid rgba(124, 140, 240, 0.15);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family);
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  transition: all var(--transition-fast);
  width: fit-content;
}

.vocab-word-btn:hover {
  transform: translateY(-2px) scale(1.03);
  border-color: var(--accent-purple);
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.12);
}

.vocab-word-btn:active {
  transform: translateY(0) scale(0.97);
}

.vocab-word-text {
  font-size: 18px;
}

.vocab-word-ipa {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
}

.vocab-word-speaker {
  font-size: 15px;
  color: var(--accent-purple-text);
  line-height: 1;
}

/* Adjust card info spacing for its new position above the card */
.card-info {
  margin-top: 10px;
  margin-bottom: 12px;
}

/* Mobile & Portrait Screen Fallback (<960px) */
@media (max-width: 959px) {
  .study-layout {
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto auto;
    gap: 16px 12px;
    align-items: center;
    justify-items: center;
    width: 100%;
    margin-top: 4px;
  }

  #prevCard {
    grid-column: 1;
    grid-row: 1;
  }

  .card-container-wrapper {
    grid-column: 2;
    grid-row: 1;
    width: 100%;
    max-width: 440px;
  }

  #nextCard {
    grid-column: 3;
    grid-row: 1;
  }

  .nav-arrow-btn {
    width: 68px;
    height: 68px;
    font-size: 26px;
  }

  .vocab-side {
    grid-column: 1 / span 3;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    gap: 10px;
    padding: 0 8px;
  }

  .vocab-left {
    grid-row: 2;
  }

  .vocab-right {
    grid-row: 3;
  }

  .vocab-left, .vocab-right {
    align-items: center;
  }

  .vocab-word-btn {
    padding: 8px 14px;
    font-size: 14px;
  }

  .vocab-word-text {
    font-size: 15px;
  }

  .vocab-word-ipa {
    font-size: 11px;
  }
  
  .card-info {
    margin-top: 6px;
    margin-bottom: 6px;
  }
}

/* ============================================================
   Gallery / Library Feature
   ============================================================ */

/* ── Gallery Toggle Button (Header) ─────────────────────── */
.gallery-toggle-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  margin-right: 10px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-purple-text);
  background: var(--accent-purple-light);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.gallery-toggle-btn:hover {
  background: #ddd6fe;
  transform: scale(1.05);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.15);
}

.gallery-toggle-btn:active {
  transform: scale(0.96) !important;
}

.gallery-toggle-btn span {
  font-size: 18px;
  line-height: 1;
}

/* ── Gallery Slide-in Animation ─────────────────────────── */
@keyframes gallerySlideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes gallerySlideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* ── Gallery Overlay ────────────────────────────────────── */
.gallery-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 200;
  background: linear-gradient(135deg, #fef9ef 0%, #f5f0ff 100%);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  animation: gallerySlideIn 0.35s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.gallery-overlay[hidden] {
  display: none !important;
}

.gallery-overlay.closing {
  animation: gallerySlideOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) both;
}

/* ── Gallery Header ─────────────────────────────────────── */
.gallery-header {
  position: sticky;
  top: 0;
  z-index: 210;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  min-height: 56px;
}

.gallery-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-blue-text);
  background: var(--accent-blue-light);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.gallery-back-btn:hover {
  background: #bfdbfe;
  transform: scale(1.04);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.15);
}

.gallery-back-btn:active {
  transform: scale(0.96) !important;
}

.gallery-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Gallery Controls Container ─────────────────────────── */
.gallery-controls {
  padding: 12px 16px 4px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Search Bar ─────────────────────────────────────────── */
.search-container {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 520px;
}

.search-icon {
  position: absolute;
  left: 14px;
  font-size: 18px;
  line-height: 1;
  pointer-events: none;
  z-index: 1;
}

.search-input {
  width: 100%;
  padding: 12px 42px 12px 44px;
  border-radius: 18px;
  border: 2px solid #e2e8f0;
  background: #ffffff;
  font-family: var(--font-family);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.search-input::placeholder {
  color: var(--text-muted);
  font-weight: 500;
}

.search-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.15);
}

.search-clear {
  position: absolute;
  right: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #f1f5f9;
  color: var(--text-secondary);
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  border: none;
  line-height: 1;
}

.search-clear:hover {
  background: #e2e8f0;
  color: var(--text-primary);
  transform: scale(1.1);
}

.search-clear[hidden] {
  display: none;
}

/* ── Color Filter Chips ─────────────────────────────────── */
.color-filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 2px;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

.color-filters::-webkit-scrollbar {
  display: none;
}

.color-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.85);
  border: 2px solid #e2e8f0;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.color-chip:hover {
  transform: scale(1.05);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.color-chip:active {
  transform: scale(0.96) !important;
}

.color-chip.active {
  border-color: var(--text-primary);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
  background: #ffffff;
}

.color-chip .chip-emoji {
  font-size: 14px;
  line-height: 1;
}

.color-chip .chip-count {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 1px;
}

/* ── Card Count Selector ────────────────────────────────── */
.card-count-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.count-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  white-space: nowrap;
}

.count-buttons {
  display: flex;
  gap: 6px;
}

.count-buttons-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.custom-count-container {
  display: flex;
  align-items: center;
}

.custom-count-input {
  width: 190px;
  padding: 6px 16px;
  border-radius: 16px;
  border: 2px solid #e2e8f0;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.85);
  outline: none;
  transition: all var(--transition-fast);
  text-align: center;
  box-sizing: border-box;
}

.custom-count-input:hover {
  border-color: var(--accent-blue);
}

.custom-count-input:focus {
  border-color: var(--accent-blue);
  background: var(--card-bg);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Chrome, Safari, Edge, Opera: Remove spin arrows */
.custom-count-input::-webkit-outer-spin-button,
.custom-count-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox: Remove spin arrows */
.custom-count-input[type=number] {
  -moz-appearance: textfield;
}

.count-btn {
  padding: 6px 16px;
  border-radius: 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.85);
  border: 2px solid #e2e8f0;
  transition: all var(--transition-fast);
}

.count-btn:hover {
  transform: scale(1.06);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
  border-color: var(--accent-blue);
}

.count-btn:active {
  transform: scale(0.95) !important;
}

.count-btn.active {
  background: var(--accent-blue-light);
  color: var(--accent-blue-text);
  border-color: var(--accent-blue);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.15);
}

/* ── Gallery Summary Bar ────────────────────────────────── */
.gallery-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  margin: 0 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.gallery-summary-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  flex: 1;
}

.gallery-summary-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
}

.selected-cards-list {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  max-width: 380px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.start-btn {
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 15px;
  font-weight: 800;
  color: #ffffff;
  background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
  border: none;
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.3);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.start-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(34, 197, 94, 0.4);
  filter: brightness(1.05);
}

.start-btn:active {
  transform: scale(0.96) !important;
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.2);
}

/* ── Gallery Card Grid ──────────────────────────────────── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
  padding: 14px 16px 32px;
}

.gallery-card {
  position: relative;
  background: #ffffff;
  border-radius: 18px;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid #e8e8ee;
}

.gallery-card:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
}

.gallery-card:active {
  transform: scale(0.98) !important;
}

.gallery-card.selected {
  border-width: 3px;
}

.gallery-card-img {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: #fafafa;
}

.gallery-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.gallery-color-dot {
  position: absolute;
  bottom: 6px;
  right: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.gallery-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px 8px;
  background: rgba(0, 0, 0, 0.02);
}

.gallery-card-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
}

.vocab-edit-trigger {
  background: transparent;
  border: none;
  font-size: 14px;
  padding: 2px;
  cursor: pointer;
  transition: transform 0.25s ease;
  z-index: 10;
}

.vocab-edit-trigger:hover {
  transform: scale(1.25);
}

/* Selected card overlay checkmark */
.gallery-card .check-overlay {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-green);
  color: #ffffff;
  font-size: 14px;
  font-weight: 800;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.35);
  z-index: 2;
}

.gallery-card.selected .check-overlay {
  display: flex;
}

/* Empty state for gallery */
.gallery-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.gallery-empty .empty-emoji {
  font-size: 48px;
  margin-bottom: 12px;
}

.gallery-empty .empty-text {
  font-size: 16px;
  font-weight: 600;
}

/* ── Gallery Responsive: Mobile (<640px) ────────────────── */
@media (max-width: 639px) {
  .gallery-toggle-btn {
    padding: 5px 12px;
    font-size: 13px;
    margin-right: 8px;
  }

  .gallery-toggle-btn span {
    font-size: 16px;
  }

  .gallery-header {
    padding: 10px 12px;
    min-height: 50px;
  }

  .gallery-back-btn {
    padding: 7px 14px;
    font-size: 14px;
  }

  .gallery-title {
    font-size: 17px;
  }

  .gallery-controls {
    padding: 10px 12px 4px;
    gap: 10px;
  }

  .search-input {
    padding: 10px 38px 10px 40px;
    font-size: 14px;
    border-radius: 16px;
  }

  .search-icon {
    left: 12px;
    font-size: 16px;
  }

  .color-chip {
    padding: 6px 11px;
    font-size: 12px;
  }

  .card-count-selector {
    gap: 8px;
  }

  .count-label {
    font-size: 13px;
  }

  .count-btn {
    padding: 5px 12px;
    font-size: 13px;
  }

  .custom-count-input {
    padding: 5px 12px;
    font-size: 13px;
    border-radius: 16px;
    width: 170px;
  }

  .gallery-summary {
    margin: 0 12px;
    padding: 8px 12px;
  }

  .gallery-summary-text {
    font-size: 13px;
  }

  .start-btn {
    padding: 8px 18px;
    font-size: 14px;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 10px;
    padding: 10px 12px 24px;
  }

  .gallery-card {
    border-radius: 14px;
  }

  .gallery-card-label {
    font-size: 12px;
    padding: 4px 4px 6px;
  }
}

/* ── Gallery Responsive: Desktop (>1024px) ──────────────── */
@media (min-width: 1025px) {
  .gallery-toggle-btn {
    padding: 7px 20px;
    font-size: 15px;
    margin-right: 14px;
  }

  .gallery-toggle-btn span {
    font-size: 20px;
  }

  .gallery-header {
    padding: 14px 32px;
    min-height: 62px;
  }

  .gallery-back-btn {
    padding: 9px 22px;
    font-size: 16px;
  }

  .gallery-title {
    font-size: 22px;
  }

  .gallery-controls {
    padding: 16px 32px 8px;
    gap: 14px;
  }

  .search-container {
    max-width: 600px;
  }

  .search-input {
    padding: 14px 48px 14px 50px;
    font-size: 16px;
  }

  .search-icon {
    left: 18px;
    font-size: 20px;
  }

  .color-chip {
    padding: 8px 16px;
    font-size: 14px;
  }

  .count-btn {
    padding: 7px 20px;
    font-size: 15px;
  }

  .custom-count-input {
    padding: 7px 20px;
    font-size: 15px;
    border-radius: 16px;
    width: 210px;
  }

  .gallery-summary {
    margin: 4px 32px;
    padding: 12px 20px;
  }

  .gallery-summary-text {
    font-size: 16px;
  }

  .start-btn {
    padding: 12px 30px;
    font-size: 16px;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    padding: 16px 32px 40px;
  }

  .gallery-card {
    border-radius: 18px;
  }

  .gallery-card-label {
    font-size: 14px;
  }
}

/* ── Gallery Responsive: TV / Large (>1400px) ───────────── */
@media (min-width: 1400px) {
  .gallery-toggle-btn {
    padding: 8px 24px;
    font-size: 17px;
    margin-right: 16px;
  }

  .gallery-toggle-btn span {
    font-size: 22px;
  }

  .gallery-header {
    padding: 16px 48px;
    min-height: 72px;
  }

  .gallery-back-btn {
    padding: 10px 26px;
    font-size: 18px;
  }

  .gallery-title {
    font-size: 26px;
  }

  .gallery-controls {
    padding: 18px 48px 8px;
    gap: 16px;
  }

  .search-container {
    max-width: 700px;
  }

  .search-input {
    padding: 16px 52px 16px 54px;
    font-size: 18px;
    border-radius: 22px;
  }

  .color-chip {
    padding: 9px 18px;
    font-size: 16px;
    border-radius: 22px;
  }

  .count-btn {
    padding: 8px 24px;
    font-size: 17px;
    border-radius: 18px;
  }

  .custom-count-input {
    padding: 8px 24px;
    font-size: 17px;
    border-radius: 18px;
    width: 240px;
  }

  .gallery-summary {
    margin: 6px 48px;
    padding: 14px 24px;
    border-radius: 20px;
  }

  .start-btn {
    padding: 14px 36px;
    font-size: 18px;
    border-radius: 24px;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    padding: 20px 48px 48px;
  }

  .gallery-card {
    border-radius: 20px;
  }

  .gallery-card-label {
    font-size: 16px;
    padding: 8px 4px 10px;
  }

  .gallery-color-dot {
    width: 14px;
    height: 14px;
  }

  .gallery-card .check-overlay {
    width: 30px;
    height: 30px;
    font-size: 16px;
  }
}

/* ── Reduced motion preference ───────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card-flipper {
    transition-duration: 0.01ms !important;
  }
}

/* ── Vocabulary Edit Overlay & Modal ─────────────────────── */
.vocab-edit-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(30, 41, 59, 0.5); /* backdrop glassmorphism */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999; /* Higher than everything else */
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-fast);
}

.vocab-edit-overlay[hidden] {
  display: none !important;
}

.vocab-edit-modal {
  width: 90%;
  max-width: 600px;
  background: var(--card-bg);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--card-shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  overflow: hidden;
  animation: bounceIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.vocab-edit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 2px solid rgba(124, 140, 240, 0.1);
}

.vocab-edit-header h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
}

.vocab-edit-close {
  background: transparent;
  border: none;
  font-size: 28px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}

.vocab-edit-close:hover {
  color: var(--text-primary);
}

.vocab-edit-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.vocab-edit-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.vocab-edit-section h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-secondary);
  border-left: 4px solid var(--accent-purple);
  padding-left: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.vocab-edit-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vocab-edit-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.vocab-edit-row input {
  padding: 10px 14px;
  border-radius: var(--border-radius-sm);
  border: 2px solid rgba(124, 140, 240, 0.15);
  font-family: var(--font-family);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  background: #fafafa;
  transition: all var(--transition-fast);
}

.vocab-edit-row input:focus {
  border-color: var(--accent-purple);
  background: #ffffff;
  outline: none;
}

.vocab-edit-row .word-input {
  flex: 1.5;
}

.vocab-edit-row .ipa-input {
  flex: 1;
}

.vocab-delete-row-btn {
  background: #fee2e2;
  color: #ef4444;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-sm);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vocab-delete-row-btn:hover {
  background: #fca5a5;
  transform: scale(1.05);
}

.vocab-add-row-btn {
  align-self: flex-start;
  padding: 8px 16px;
  background: var(--accent-purple-light);
  color: var(--accent-purple-text);
  border: none;
  border-radius: var(--border-radius-sm);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vocab-add-row-btn:hover {
  background: #ddd6fe;
  transform: translateY(-1px);
}

.vocab-edit-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 18px 24px;
  border-top: 2px solid rgba(124, 140, 240, 0.1);
  background: #fafafa;
}

.vocab-btn {
  padding: 12px 24px;
  border-radius: var(--border-radius-sm);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.vocab-cancel-btn {
  background: #e2e8f0;
  color: #475569;
  border: none;
}

.vocab-cancel-btn:hover {
  background: #cbd5e1;
}

.vocab-save-btn {
  background: var(--accent-green);
  color: #ffffff;
  border: none;
}

.vocab-save-btn:hover {
  background: #16a34a;
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.3);
}

/* ── Export JSON Button inside Gallery Summary ────────────────── */
.gallery-summary-actions {
  display: flex;
  gap: 12px;
}

.export-btn {
  padding: 8px 18px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-blue-text);
  background: var(--accent-blue-light);
  border: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.export-btn:hover {
  background: #bfdbfe;
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.export-btn:active {
  transform: translateY(0);
}