/* Enterprise IELTS B2-C1 Design System */
:root {
  --bg-dark: #090d16;
  --bg-card: #111827;
  --bg-card-hover: #172136;
  --border-color: #1f2937;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
}

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

body.dark-theme {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.5;
  padding: 24px;
}

.app-container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  font-size: 2rem;
  background: rgba(6, 182, 212, 0.1);
  padding: 8px;
  border-radius: 10px;
}

.brand h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand h1 span {
  color: var(--accent-cyan);
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.nav-telemetry {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-info { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); border: 1px solid rgba(6, 182, 212, 0.3); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); border: 1px solid rgba(139, 92, 246, 0.3); }

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-main);
  border-color: var(--accent-cyan);
}

.tab-btn.active {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Grid & Cards */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 950px) {
  .grid-2col { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.card-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

.section-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* 3D Flashcard Component */
.srs-container {
  min-height: 480px;
}

.flashcard-3d-wrapper {
  perspective: 1000px;
  width: 100%;
  height: 280px;
  cursor: pointer;
  margin-bottom: 20px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

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

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
}

.flashcard-front {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.05), rgba(16, 185, 129, 0.05));
}

.flashcard-back {
  background: rgba(17, 24, 39, 0.95);
  transform: rotateY(180deg);
  text-align: left;
  align-items: flex-start;
  overflow-y: auto;
}

.fc-badge-top {
  position: absolute;
  top: 14px;
  left: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.flashcard-headword {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--accent-cyan);
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.fc-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 12px;
}

.audio-pronounce-btn {
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 14px;
  transition: all 0.2s;
}

.audio-pronounce-btn:hover {
  background: var(--accent-cyan);
  color: #000;
}

.fc-pos {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-amber);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.fc-def { font-size: 1rem; margin-bottom: 10px; line-height: 1.5; }
.fc-example { font-style: italic; color: var(--text-muted); font-size: 0.9rem; margin-bottom: 12px; }
.fc-family { font-size: 0.85rem; color: var(--accent-emerald); margin-bottom: 8px; }
.fc-schedule-note { font-size: 0.8rem; color: var(--accent-purple); font-family: 'JetBrains Mono', monospace; }

/* SM-2 Recall Actions Bar */
.recall-actions-bar {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rating-prompt-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.rating-buttons-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.btn-sm2 {
  padding: 10px;
  border-radius: 8px;
  border: none;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease;
  text-align: center;
}

.btn-sm2:hover { transform: translateY(-2px); }
.btn-sm2 small { font-size: 0.7rem; font-weight: 400; opacity: 0.9; }

.btn-again { background: #e11d48; color: #fff; }
.btn-hard { background: #d97706; color: #fff; }
.btn-good { background: #059669; color: #fff; }
.btn-easy { background: #2563eb; color: #fff; }

.srs-feedback-toast {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent-emerald);
  padding: 6px;
  text-align: center;
}

/* Lexicon Explorer */
.search-bar-row {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.search-bar-row input, .search-bar-row select, textarea {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  outline: none;
}

.search-bar-row input { flex-grow: 1; }
.search-bar-row input:focus, textarea:focus { border-color: var(--accent-cyan); }

.lexicon-results-list {
  max-height: 480px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lexicon-item-row {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
}

.lex-row-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
}

.lex-word { font-weight: 700; color: var(--accent-cyan); font-size: 0.95rem; }
.lex-def { font-size: 0.85rem; margin-bottom: 4px; }
.lex-ex { font-size: 0.8rem; font-style: italic; color: var(--text-muted); }

/* Reading Simulator */
.exam-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 12px 20px;
  border-radius: 10px;
  margin-bottom: 16px;
}

.passage-selector-group {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 600;
}

.timer-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.timer-digits { color: var(--accent-amber); }

.passage-text-scroller {
  max-height: 560px;
  overflow-y: auto;
  font-size: 0.95rem;
  line-height: 1.8;
  padding-right: 12px;
}

.passage-text-scroller p { margin-bottom: 18px; }

.items-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 560px;
  overflow-y: auto;
}

.item-box {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
}

.item-stem {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.options-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.option-choice {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  cursor: pointer;
}

.item-feedback {
  background: rgba(16, 185, 129, 0.1);
  border-left: 3px solid var(--accent-emerald);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 0.8rem;
  margin-top: 10px;
}

/* Audio Player */
.audio-player-widget {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}

.audio-controls-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.audio-controls-row input[type="range"] { flex-grow: 1; }
.timestamp-display { font-family: 'JetBrains Mono', monospace; font-size: 0.85rem; color: var(--accent-cyan); }

.playback-rate-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 0.8rem;
}

.btn-speed {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
}

.btn-speed.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
}

.live-subtitle-box {
  background: rgba(0, 0, 0, 0.5);
  border-left: 4px solid var(--accent-cyan);
  padding: 14px 18px;
  border-radius: 6px;
}

.subtitle-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-amber);
  text-transform: uppercase;
}

.live-cue-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-top: 6px;
}

.code-block {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  max-height: 180px;
  overflow-y: auto;
  color: var(--text-muted);
}

/* Writing CAF Evaluator */
.editor-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.word-counter-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

.criteria-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.crit-box {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.crit-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; margin-bottom: 4px; }
.crit-val { font-size: 1.8rem; font-weight: 900; color: var(--accent-cyan); }
.band-badge { font-size: 1.15rem; font-weight: 800; color: var(--accent-emerald); }

.caf-metrics-panel {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 16px;
}

.caf-metrics-panel h4 { font-size: 0.85rem; margin-bottom: 10px; color: var(--text-muted); }

.caf-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.metric-pill {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
}

.m-name { color: var(--text-muted); }
.m-val { font-weight: 700; color: var(--accent-emerald); font-family: 'JetBrains Mono', monospace; }

.feedback-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  margin-top: 8px;
}

.feedback-list li {
  background: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--accent-cyan);
  padding: 8px 12px;
  border-radius: 4px;
}

/* SILL Profiler */
.sill-questions-list {
  max-height: 480px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 8px;
  margin-bottom: 20px;
}

.sill-item-row {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.sill-q-text { font-size: 0.85rem; flex-grow: 1; }
.sill-likert-scale { display: flex; gap: 6px; }

.likert-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.likert-btn.selected {
  background: var(--accent-cyan);
  color: #000;
  border-color: var(--accent-cyan);
}

.sill-categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.sill-cat-box {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
}

.sill-cat-header { display: flex; justify-content: space-between; font-weight: 600; font-size: 0.85rem; margin-bottom: 6px; }
.sill-cat-score { color: var(--accent-cyan); font-weight: 800; }

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-cyan);
  border-radius: 3px;
}

/* Research & Skills Grid */
.research-grid, .skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 16px;
}

.research-card-item, .skill-card-item {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.rc-title { font-weight: 700; color: var(--accent-cyan); font-size: 0.95rem; margin-bottom: 4px; }
.rc-author { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
.rc-app { font-size: 0.85rem; line-height: 1.5; color: #e5e7eb; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.btn-lg { padding: 12px 24px; font-size: 0.95rem; }
.btn-sm { padding: 4px 10px; font-size: 0.75rem; }
.btn-primary { background: var(--accent-cyan); color: #000; font-weight: 700; }
.btn-primary:hover { opacity: 0.9; }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-outline:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }

.hidden { display: none !important; }