/* CineAHO Premium TOEIC Word App Stylesheet */

:root {
  /* Theme Colors - Navy Glassmorphism */
  --bg-dark: #040713;
  --bg-grid: rgba(255, 255, 255, 0.015);
  
  --panel-bg: rgba(10, 16, 32, 0.65);
  --panel-border: rgba(255, 255, 255, 0.05);
  --panel-hover-border: rgba(6, 182, 212, 0.35); /* Cyan Glow */
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #475569;

  /* Accent Colors */
  --color-cyan: #06b6d4;
  --color-purple: #a855f7;
  --color-green: #10b981;
  --color-red: #ef4444;
  --color-gold: #fbbf24;

  /* Gradations */
  --grad-cyan: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
  --grad-purple: linear-gradient(135deg, #a855f7 0%, #7e22ce 100%);
  --grad-green: linear-gradient(135deg, #10b981 0%, #047857 100%);
  --grad-red: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
  --grad-progress: linear-gradient(90deg, #06b6d4 0%, #10b981 100%);

  --cyan-glow: 0 0 25px rgba(6, 182, 212, 0.25);
  --purple-glow: 0 0 25px rgba(168, 85, 247, 0.25);
  
  --font-main: 'Noto Sans KR', 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --shadow-card: 0 12px 40px 0 rgba(0, 0, 0, 0.6);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Background grid overlay */
body::before {
  content: '';
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-image: 
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
  pointer-events: none;
}

/* Ambient glow bubbles */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(160px);
  z-index: -3;
  pointer-events: none;
  opacity: 0.16;
}

.bg-glow-purple {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #7e22ce 0%, transparent 70%);
  top: -100px;
  left: 5%;
}

.bg-glow-blue {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #0891b2 0%, transparent 70%);
  bottom: 10%;
  right: 5%;
}

/* Hidden Utility */
.hidden {
  display: none !important;
}

/* Header styling */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 1rem 1.5rem 0 1.5rem;
  border-radius: 50px;
  transition: var(--transition-smooth);
}

.glass-header {
  background: rgba(10, 16, 32, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.logo-circle {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(6, 182, 212, 0.3);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-text {
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.95rem;
}

.logo-text span {
  color: var(--text-muted);
  font-weight: 400;
}

.header-nav {
  flex-grow: 1;
  margin: 0 2rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.header-nav::-webkit-scrollbar {
  display: none;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  white-space: nowrap;
}

.nav-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition-smooth);
  padding: 0.5rem 0.25rem;
  position: relative;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--text-main);
}

.nav-list a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: #06b6d4;
  border-radius: 2px;
}

.btn-back-dashboard {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 30px;
  padding: 0.5rem 1.2rem;
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-back-dashboard:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #06b6d4;
  transform: translateX(-2px);
}

/* App general container */
.toeic-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.toeic-header-section {
  text-align: center;
}

.main-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
  letter-spacing: -0.5px;
}

.main-title span {
  background: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-cyan {
  color: #06b6d4 !important;
}
.text-green {
  color: #10b981 !important;
}
.text-red {
  color: #ef4444 !important;
}
.text-gold {
  color: #fbbf24 !important;
}

.subtitle-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 1.25rem auto;
  line-height: 1.6;
}

.tag-badges {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.25rem 0.75rem;
  border-radius: 30px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.badge-tag {
  background: rgba(6, 182, 212, 0.05);
  border-color: rgba(6, 182, 212, 0.12);
  color: #22d3ee;
}

/* Glass panel base */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.glass-panel:hover {
  border-color: var(--panel-hover-border);
}


/* ==========================================================================
   PROGRESS & DATA UTILITIES
   ========================================================================== */
.progress-and-utils {
  padding: 1.25rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.progress-left {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
}

.progress-label-row span {
  color: var(--text-muted);
}

.progress-label-row strong {
  color: #fff;
  font-family: var(--font-display);
}

.progress-bar-track {
  height: 8px;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--grad-progress);
  border-radius: 10px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.utils-right {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* Button UI */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition-bounce);
  color: #fff;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.78rem;
  border-radius: 6px;
}
.btn-xs {
  padding: 0.25rem 0.6rem;
  font-size: 0.7rem;
  border-radius: 4px;
}
.btn-lg {
  padding: 0.85rem 1.8rem;
  font-size: 0.95rem;
  border-radius: 10px;
}

.btn-primary {
  background: var(--grad-cyan);
  box-shadow: var(--cyan-glow);
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(6, 182, 212, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: #06b6d4;
  color: #fff;
}

.btn-danger {
  background: var(--grad-red);
}
.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
}

.btn-success {
  background: var(--grad-green);
}
.btn-success:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}


/* ==========================================================================
   TAB BUTTONS NAVIGATION
   ========================================================================== */
.learning-tabs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  width: 100%;
}

.tab-btn {
  background: rgba(10, 16, 32, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: 0.75rem 0.5rem;
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: center;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.02);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.1);
}

.tab-btn.active {
  background: rgba(6, 182, 212, 0.08);
  border-color: #06b6d4;
  color: #22d3ee;
  box-shadow: var(--cyan-glow);
}

/* Info helper instructions */
.instruction-box {
  background: rgba(255, 255, 255, 0.015);
  border: 1px dashed rgba(255, 255, 255, 0.05);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.instruction-box p {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}


/* ==========================================================================
   MAIN LEARNING WORKSPACE
   ========================================================================== */
.learning-workspace {
  min-height: 520px;
  padding: 1.8rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.tab-content {
  display: none;
  flex-grow: 1;
  flex-direction: column;
}
.tab-content.active {
  display: flex;
}


/* --------------------------------------------------------------------------
   TAB 1: 목록 전체
   -------------------------------------------------------------------------- */
.table-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  gap: 1rem;
}

.search-bar-box {
  position: relative;
  max-width: 380px;
  width: 100%;
}
.search-bar-box i {
  position: absolute;
  top: 50%; left: 0.9rem;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.85rem;
}
#word-search {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 30px;
  padding: 0.6rem 1.2rem 0.6rem 2.2rem;
  color: #fff;
  font-family: var(--font-main);
  font-size: 0.82rem;
  outline: none;
  transition: var(--transition-smooth);
}
#word-search:focus {
  border-color: #06b6d4;
  box-shadow: var(--cyan-glow);
}

.filter-box {
  display: flex;
  gap: 0.5rem;
}

.select-dropdown {
  appearance: none;
  background: rgba(0, 0, 0, 0.3) url("data:image/svg+xml;utf8,<svg fill='none' stroke='%2394a3b8' stroke-width='2' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'><path stroke-linecap='round' stroke-linejoin='round' d='M19.5 8.25l-7.5 7.5-7.5-7.5'></path></svg>") no-repeat right 0.75rem center;
  background-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.5rem 2.2rem 0.5rem 0.85rem;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-family: var(--font-main);
  outline: none;
  cursor: pointer;
  min-width: 110px;
  transition: var(--transition-smooth);
}
.select-dropdown:focus {
  border-color: #06b6d4;
  color: #fff;
}

/* Word lists table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.vocab-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.vocab-table th,
.vocab-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 0.8rem;
}

.vocab-table th {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.vocab-table tbody tr {
  transition: var(--transition-smooth);
}
.vocab-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.015);
}

/* Checkbox checkbox toggle */
.check-col {
  text-align: center;
}
.checkbox-memorized {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: #10b981;
}

.word-link {
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  position: relative;
  transition: var(--transition-smooth);
  border-bottom: 1px dashed rgba(255,255,255,0.15);
  display: inline-block;
}
.word-link:hover {
  color: #22d3ee;
  border-bottom-color: #22d3ee;
}

.sentence-link {
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-smooth);
}
.sentence-link:hover {
  color: #a855f7;
  text-decoration: underline;
}

.phonetic-txt {
  font-family: monospace;
  color: var(--text-muted);
}

.pos-tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.btn-row-speak {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition-smooth);
  padding: 0.25rem;
}
.btn-row-speak:hover {
  color: #06b6d4;
  transform: scale(1.1);
}

/* Memorized row row dimmed effect */
.vocab-table tr.memorized-row td {
  opacity: 0.45;
}
.vocab-table tr.memorized-row .checkbox-memorized {
  opacity: 1 !important;
}

/* Pagination container */
.pagination-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.5rem;
}

.page-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}
.page-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.1);
}
.page-btn.active {
  background: #06b6d4;
  border-color: #06b6d4;
  color: #fff;
  box-shadow: var(--cyan-glow);
}
.page-btn.disabled {
  opacity: 0.3;
  cursor: not-allowed;
}


/* --------------------------------------------------------------------------
   TAB 2: 플래시카드 (3D CARD EFFECT)
   -------------------------------------------------------------------------- */
.flashcard-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
  padding: 1.5rem 0;
  gap: 1.5rem;
}

/* Perspective viewport */
.flashcard-container {
  width: 440px;
  height: 250px;
  perspective: 1000px;
  cursor: pointer;
  position: relative;
}

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 16px;
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.card-front {
  background: radial-gradient(circle at 50% 50%, rgba(10, 24, 32, 0.95) 0%, rgba(6, 15, 20, 0.98) 100%);
  transform: rotateY(0deg);
  border-color: rgba(6, 182, 212, 0.25);
}

.card-back {
  background: radial-gradient(circle at 50% 50%, rgba(16, 10, 32, 0.95) 0%, rgba(10, 6, 20, 0.98) 100%);
  transform: rotateY(180deg);
  border-color: rgba(168, 85, 247, 0.25);
  text-align: center;
}

.flashcard-container.flipped .card-front {
  transform: rotateY(-180deg);
}
.flashcard-container.flipped .card-back {
  transform: rotateY(0deg);
}

.card-hint-badge {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: 0.5px;
}

.card-pos-badge {
  position: absolute;
  top: 1rem;
  left: 1.25rem;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
  color: #c084fc;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

#fc-word {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
}

#fc-meaning {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.fc-phonetic {
  font-family: monospace;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.85rem;
}

.fc-sentence {
  font-size: 0.82rem;
  color: #f1f5f9;
  font-style: italic;
  max-width: 360px;
}
.fc-sentence-ko {
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.card-sound-row {
  margin-top: 1rem;
}
.btn-voice-speaker {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}
.btn-voice-speaker:hover {
  color: #06b6d4;
  border-color: #06b6d4;
  transform: scale(1.1);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

/* Card Control arrows panel */
.card-controls-panel {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.card-index-lbl {
  font-size: 0.85rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-muted);
}

.card-action-panel {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.shortcut-tip {
  font-size: 0.7rem;
  color: var(--text-dark);
}
.shortcut-tip kbd {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-family: monospace;
}


/* --------------------------------------------------------------------------
   TAB 3: 퀴즈 (4지선다)
   -------------------------------------------------------------------------- */
.quiz-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  gap: 1.5rem;
}

.quiz-dashboard {
  display: flex;
  width: 100%;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 10px;
  padding: 0.75rem 1.5rem;
  justify-content: space-between;
}

.quiz-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
}
.quiz-stat-item strong {
  font-size: 1.1rem;
  color: #fff;
  font-family: var(--font-display);
}

.quiz-question-box {
  width: 100%;
  background: rgba(255,255,255,0.01);
  border: 1px dashed rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 2.2rem;
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.quiz-type-badge {
  position: absolute;
  top: 0.75rem; left: 1rem;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

#quiz-question-word {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
}

.quiz-choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  width: 100%;
}

.btn-choice {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 1.1rem 1.25rem;
  color: #e2e8f0;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: var(--transition-bounce);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.btn-choice:hover:not(:disabled) {
  background: rgba(6, 182, 212, 0.05);
  border-color: #06b6d4;
  transform: translateY(-1px);
}

.choice-num {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.74rem;
  flex-shrink: 0;
}

/* Choice validation colors */
.btn-choice.correct {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: #10b981 !important;
  color: #a7f3d0 !important;
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.25);
}
.btn-choice.wrong {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: #ef4444 !important;
  color: #fecaca !important;
}

/* Feedback panel */
.quiz-feedback-box {
  width: 100%;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: slideUp 0.35s ease-out;
}

@keyframes slideUp {
  0% { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

#quiz-feedback-msg {
  font-size: 1.1rem;
  font-weight: 700;
}
#quiz-feedback-msg.correct { color: #10b981; }
#quiz-feedback-msg.wrong { color: #ef4444; }

#quiz-feedback-detail {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}


/* --------------------------------------------------------------------------
   TAB 4: 뜻 타이핑
   -------------------------------------------------------------------------- */
.typing-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  gap: 1.5rem;
}

.typing-question-card {
  width: 100%;
  background: rgba(255,255,255,0.01);
  border: 1px dashed rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 2.2rem;
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

#type-question-word {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
}

.type-hint-row {
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#type-hint-txt {
  font-size: 0.8rem;
  font-weight: 700;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.typing-input-bar {
  display: flex;
  width: 100%;
  gap: 0.5rem;
}

#type-input {
  flex-grow: 1;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: #fff;
  font-family: var(--font-main);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-smooth);
}
#type-input:focus {
  border-color: #06b6d4;
  box-shadow: var(--cyan-glow);
}

.typing-feedback-box {
  width: 100%;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: slideUp 0.35s ease-out;
}

#type-result-title.correct { color: #10b981; }
#type-result-title.wrong { color: #ef4444; }

.type-sentence-box {
  width: 100%;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid rgba(255,255,255,0.03);
  border-radius: 8px;
  padding: 0.85rem;
  margin: 0.25rem 0;
  text-align: center;
}
.type-sentence-box p {
  font-size: 0.8rem;
  color: #f1f5f9;
  font-style: italic;
}
.type-sentence-box span {
  font-size: 0.72rem;
  color: var(--text-muted);
}


/* --------------------------------------------------------------------------
   TAB 5: 철자 테스트
   -------------------------------------------------------------------------- */
.spelling-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  gap: 1.5rem;
}

.spelling-question-card {
  width: 100%;
  background: rgba(255,255,255,0.01);
  border: 1px dashed rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.btn-audio-listen {
  background: var(--grad-cyan);
  border: none;
  border-radius: 30px;
  padding: 0.75rem 1.8rem;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  box-shadow: var(--cyan-glow);
  transition: var(--transition-bounce);
}
.btn-audio-listen:hover {
  transform: scale(1.03);
}

.spelling-meaning-lbl {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

/* Slots for characters */
.spelling-slots-container {
  display: flex;
  justify-content: center;
  gap: 0.45rem;
  margin: 0.5rem 0;
  flex-wrap: wrap;
}

.spelling-char-slot {
  width: 28px;
  height: 38px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: #22d3ee;
  text-transform: lowercase;
  transition: var(--transition-smooth);
}
.spelling-char-slot.revealed {
  border-bottom-color: #06b6d4;
  text-shadow: var(--cyan-glow);
}

.spelling-input-container {
  display: flex;
  width: 100%;
  gap: 0.5rem;
}
#spell-input {
  flex-grow: 1;
  background: rgba(0,0,0,0.3);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: #fff;
  font-family: var(--font-main);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-smooth);
  text-align: center;
  letter-spacing: 2px;
}
#spell-input:focus {
  border-color: #06b6d4;
}

.spelling-feedback-box {
  width: 100%;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  animation: slideUp 0.35s ease-out;
}
#spell-result-title.correct { color: #10b981; }
#spell-result-title.wrong { color: #ef4444; }


/* --------------------------------------------------------------------------
   TAB 6: 매칭 (MEMORY GAME)
   -------------------------------------------------------------------------- */
.matching-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  flex-grow: 1;
}

.matching-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0,0,0,0.2);
  border: 1px solid rgba(255,255,255,0.04);
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  gap: 1rem;
}

.match-stat {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.match-stat strong {
  color: #fff;
  font-family: var(--font-display);
}

/* Game grid */
.matching-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  flex-grow: 1;
  min-height: 320px;
  align-content: start;
}

.match-welcome-msg {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}
.match-welcome-msg h3 {
  font-size: 1.25rem;
  color: #fff;
}
.match-welcome-msg p {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.5;
}

.match-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 90px;
  cursor: pointer;
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  transition: var(--transition-bounce);
  user-select: none;
}

.match-card:hover {
  background: rgba(255, 255, 255, 0.04);
  transform: scale(1.03);
}

.match-card.selected {
  border-color: #06b6d4;
  background: rgba(6, 182, 212, 0.05);
  box-shadow: var(--cyan-glow);
}

.match-card.matched {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease-out, visibility 0.4s;
}

.match-card.shake-wrong {
  border-color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
  animation: shakeEffect 0.35s ease-in-out;
}

@keyframes shakeEffect {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}


/* ==========================================================================
   WORD TOOLTIP PREVIEW CARD
   ========================================================================== */
.word-preview-tooltip {
  position: absolute;
  z-index: 1000;
  width: 250px;
  background: rgba(8, 14, 28, 0.95);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 10px;
  padding: 0.85rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.8), var(--cyan-glow);
  pointer-events: none;
  animation: fadeIn 0.15s ease-out;
}

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

.tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  padding-bottom: 0.25rem;
  margin-bottom: 0.35rem;
}

.tt-word {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
}
.tt-pos {
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(6, 182, 212, 0.1);
  color: #22d3ee;
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
}

.tt-phonetic {
  font-family: monospace;
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}
.tt-meaning {
  font-size: 0.8rem;
  font-weight: 600;
  color: #e2e8f0;
}

.tooltip-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.62rem;
  color: var(--text-dark);
  margin-top: 0.5rem;
  border-top: 1px dashed rgba(255,255,255,0.03);
  padding-top: 0.35rem;
}


/* ==========================================================================
   RESPONSIVENESS
   ========================================================================== */
@media (max-width: 900px) {
  .learning-tabs {
    grid-template-columns: repeat(3, 1fr);
  }
  .progress-and-utils {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  .utils-right {
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .learning-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  .table-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .filter-box {
    justify-content: space-between;
  }
  .flashcard-container {
    width: 100%;
    max-width: 320px;
    height: 220px;
  }
  #fc-word {
    font-size: 2.2rem;
  }
  #fc-meaning {
    font-size: 1.3rem;
  }
  .quiz-choices-grid {
    grid-template-columns: 1fr;
  }
  .matching-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}