/* ======== SCIENCE LAB STYLES ======== */

/* -- Centered wrapper -- */
.sci-home {
  max-width: 700px;
  margin: 0 auto;
  padding-bottom: var(--space-8);
}

/* -- Stats Bar -- */
.sci-stats-bar {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}
.sci-stat-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-2);
  border-radius: var(--radius-full, 50px);
  font-size: var(--text-sm);
  font-weight: 600;
}

/* -- Tier Groups -- */
.sci-tier-group {
  margin-bottom: var(--space-4);
}
.sci-tier-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

/* -- Section & Layout -- */
.sci-section { margin-bottom: var(--space-6); }
.sci-section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.sci-section-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

/* -- Button Row (compact Olympiad-style) -- */
.sci-btn-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.sci-set-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg, 16px);
  background: var(--color-surface, #fff);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  text-align: center;
  position: relative;
}
.sci-set-btn:hover {
  border-color: #4CAF50;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.2);
}
.sci-set-btn.completed {
  border-color: #22c55e;
  background: rgba(34, 197, 94, 0.05);
}
.sci-set-emoji { font-size: 1.5rem; }
.sci-set-name { font-weight: 600; font-size: 0.8rem; color: var(--color-text); }
.sci-set-progress { font-size: 0.7rem; color: var(--color-text-muted); }
.sci-check { color: #22c55e; font-size: 0.9rem; }

/* -- Card Grid (legacy) -- */
.sci-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

/* -- Cards (home page) -- */
.sci-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.sci-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.sci-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.sci-card-emoji { font-size: 2rem; }
.sci-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}
.sci-card-body { flex: 1; }
.sci-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.sci-card-progress {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* -- Level Badge -- */
.sci-level-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 99px;
  color: #fff;
}
.sci-level-badge[data-level="beginner"] { background: #4CAF50; }
.sci-level-badge[data-level="intermediate"] { background: #FF9800; }
.sci-level-badge[data-level="advanced"] { background: var(--color-accent); }

/* -- Back Bar -- */
.sci-back-bar {
  margin-bottom: var(--space-4);
}
.sci-back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  transition: all 0.15s ease;
}
.sci-back-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* -- Buttons -- */
.sci-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-5);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 2px solid transparent;
}
.sci-btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.sci-btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.sci-btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.sci-btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}
.sci-btn-small {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
}

/* -- Progress Bars -- */
.sci-progress-pill {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.sci-progress-bar-wrap, .sci-progress-bar {
  height: 8px;
  border-radius: 99px;
  background: var(--color-border);
  flex: 1;
  overflow: hidden;
}
.sci-progress-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--color-primary);
  transition: width 0.4s ease;
}

/* ======== ELEMENT STUDY ======== */
.sci-elements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

/* Single element card view */
.sci-element-single {
  max-width: 420px;
  margin: 0 auto;
  overflow: hidden;
}

/* Dot indicators */
.sci-element-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.sci-element-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: all 0.2s;
}
.sci-element-dot.active {
  background: var(--color-primary);
  transform: scale(1.3);
}
.sci-element-dot.learned {
  background: var(--color-success);
}
.sci-element-dot.learned.active {
  background: var(--color-success);
  transform: scale(1.3);
  box-shadow: 0 0 6px rgba(91, 184, 122, 0.4);
}

/* Navigation bar */
.sci-element-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding: var(--space-3) 0;
}
.sci-element-nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  font-weight: 700;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all 0.2s;
}
.sci-element-nav-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}
.sci-element-nav-btn svg {
  width: 18px;
  height: 18px;
}
.sci-element-nav-counter {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-muted);
  min-width: 60px;
  text-align: center;
}

/* Slide animations */
.sci-slide-out-left {
  animation: sciSlideOutLeft 0.15s ease forwards;
}
.sci-slide-out-right {
  animation: sciSlideOutRight 0.15s ease forwards;
}
.sci-slide-in-left {
  animation: sciSlideInLeft 0.25s ease forwards;
}
.sci-slide-in-right {
  animation: sciSlideInRight 0.25s ease forwards;
}
@keyframes sciSlideOutLeft {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(-40px); opacity: 0; }
}
@keyframes sciSlideOutRight {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(40px); opacity: 0; }
}
@keyframes sciSlideInLeft {
  from { transform: translateX(-40px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes sciSlideInRight {
  from { transform: translateX(40px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
.sci-element-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: all 0.2s ease;
  position: relative;
}
.sci-element-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.sci-element-top {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.sci-element-emoji { font-size: 2.2rem; }
.sci-element-symbol {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}
.sci-element-number {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 600;
}
.sci-element-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}
.sci-element-pronunciation {
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-style: italic;
  margin-top: 2px;
}
.sci-element-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-2);
}
.sci-element-find {
  margin-top: var(--space-2);
}
.sci-element-find strong {
  font-size: var(--text-xs);
  color: var(--color-text);
  display: block;
  margin-bottom: 4px;
}
.sci-element-find-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: var(--text-xs);
}
.sci-element-find-list span {
  background: var(--color-bg);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}
.sci-element-origin {
  font-size: var(--text-xs);
  color: #9333ea;
  margin-top: var(--space-2);
  padding: var(--space-2);
  background: rgba(147, 51, 234, 0.06);
  border-radius: var(--radius-sm);
  line-height: 1.4;
}
.sci-star-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  transition: transform 0.2s ease;
  padding: 4px;
}
.sci-star-btn:hover { transform: scale(1.2); }

/* ======== STATES OF MATTER ======== */
.sci-states-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.sci-state-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  transition: all 0.2s ease;
}
.sci-state-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}
.sci-state-emoji { font-size: 3rem; margin-bottom: var(--space-2); }
.sci-state-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.sci-state-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}
.sci-state-examples {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-bottom: var(--space-3);
}
.sci-state-example {
  font-size: var(--text-xs);
  background: var(--color-bg);
  padding: 3px 10px;
  border-radius: 99px;
}
.sci-state-funfact {
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: rgba(231, 76, 110, 0.06);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

/* -- State Changes -- */
.sci-changes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-3);
}
.sci-change-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  text-align: center;
}
.sci-change-emoji { font-size: 1.6rem; margin-bottom: 4px; }
.sci-change-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.sci-change-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.sci-change-example {
  font-size: var(--text-xs);
  color: var(--color-primary);
  margin-top: 4px;
}

/* ======== COMPOUND BROWSER ======== */
.sci-compound-viewer {
  max-width: 640px;
  margin: 0 auto;
}
.sci-compound-card-big {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
}
.sci-compound-name-big {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.sci-compound-formula-big {
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.sci-compound-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background: var(--color-bg);
  border-radius: var(--radius-md);
}
.sci-compound-element {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.sci-compound-el-symbol {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-lg);
  color: var(--color-primary);
}
.sci-compound-el-emoji { font-size: 1.2rem; }
.sci-compound-el-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.sci-compound-plus {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-muted);
}
.sci-compound-arrow {
  font-size: var(--text-xl);
  color: var(--color-accent);
}
.sci-compound-result {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.sci-compound-result-emoji { font-size: 2rem; }
.sci-compound-result-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.sci-compound-explanation {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  text-align: left;
  padding: var(--space-4);
  background: rgba(231, 76, 110, 0.04);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}
.sci-compound-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

/* ======== QUIZ / ELEMENT EXPLORER ======== */
.sci-quiz-card {
  max-width: 560px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.sci-quiz-progress-bar {
  height: 6px;
  background: var(--color-border);
  border-radius: 99px;
  margin-bottom: var(--space-4);
  overflow: hidden;
}
.sci-quiz-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 99px;
  transition: width 0.3s ease;
}
.sci-quiz-score {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-3);
}
.sci-quiz-question {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-4);
}
.sci-quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.sci-quiz-options button {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}
.sci-quiz-options button:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: rgba(231, 76, 110, 0.04);
}
.sci-quiz-options button.correct {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
  color: #2E7D32;
}
.sci-quiz-options button.wrong {
  border-color: #E53935;
  background: rgba(229, 57, 53, 0.1);
  color: #C62828;
}
.sci-quiz-feedback {
  text-align: center;
  font-weight: 600;
  font-size: var(--text-sm);
  color: #2E7D32;
  margin-top: var(--space-3);
  padding: var(--space-2);
  background: rgba(76, 175, 80, 0.08);
  border-radius: var(--radius-sm);
}
.sci-quiz-feedback-wrong {
  color: #C62828;
  background: rgba(229, 57, 53, 0.08);
}
.sci-quiz-next-btn {
  display: block;
  margin: var(--space-3) auto 0;
}

/* Quiz Results */
.sci-quiz-results {
  text-align: center;
  padding: var(--space-5);
}
.sci-quiz-results-emoji { font-size: 3rem; margin-bottom: var(--space-2); }
.sci-quiz-results-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.sci-quiz-results-score {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.sci-quiz-results-message {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.sci-quiz-results-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ======== STATE SORTER ======== */
.sci-sorter-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
}
.sci-sorter-item-emoji { font-size: 3rem; margin-bottom: var(--space-2); }
.sci-sorter-item-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.sci-sorter-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.sci-sorter-buttons button {
  padding: var(--space-3);
  font-size: var(--text-base);
  font-weight: 700;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: all 0.15s ease;
}
.sci-sorter-buttons button:hover {
  border-color: var(--color-primary);
  background: rgba(231, 76, 110, 0.06);
  transform: translateY(-2px);
}

/* ======== MIX LAB ======== */
.sci-mixlab-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-5);
  align-items: start;
}
@media (max-width: 768px) {
  .sci-mixlab-layout {
    grid-template-columns: 1fr;
  }
}
.sci-mixlab-shelf {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.sci-mixlab-shelf-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.sci-mixlab-ingredients {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--space-2);
}
.sci-ingredient-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: all 0.15s ease;
}
.sci-ingredient-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: rgba(231, 76, 110, 0.04);
}
.sci-ingredient-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.sci-ingredient-emoji { font-size: 1.6rem; }
.sci-ingredient-name {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}

/* -- Beaker Area -- */
.sci-mixlab-beaker-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}
.sci-beaker {
  width: 180px;
  min-height: 200px;
  border: 3px solid var(--color-border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  border-top: none;
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: var(--space-3);
  gap: var(--space-2);
  position: relative;
}
.sci-beaker::before {
  content: '';
  position: absolute;
  top: -4px;
  left: -10px;
  right: -10px;
  height: 4px;
  background: var(--color-border);
  border-radius: 99px;
}
.sci-beaker-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}
.sci-beaker-empty {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--space-4);
}
.sci-beaker-contents {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
}
.sci-beaker-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
}
.sci-beaker-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 1rem;
  padding: 0 2px;
}
.sci-beaker-remove:hover { color: var(--color-error); }
.sci-mix-btn {
  width: 100%;
}

/* Mix Result */
.sci-mix-result {
  text-align: center;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  animation: sciPop 0.3s ease;
}
.sci-mix-result-emoji { font-size: 3rem; margin-bottom: var(--space-2); }
.sci-mix-result-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.sci-mix-result-reaction {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}
.sci-mix-result-science {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  line-height: 1.5;
  margin-bottom: var(--space-3);
}
.sci-mix-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--space-2);
}

/* Recipe Book */
.sci-recipe-book {
  margin-top: var(--space-5);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.sci-recipe-book h3 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  margin-bottom: var(--space-3);
}
.sci-recipe-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.sci-recipe-item:last-child { border-bottom: none; }
.sci-recipe-emoji { font-size: 1.2rem; }
.sci-recipe-name { flex: 1; font-weight: 600; color: var(--color-text); }
.sci-recipe-check { color: #4CAF50; font-weight: 700; }

/* ======== EQUATION BUILDER ======== */
.sci-eq-challenge {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.sci-eq-compound-name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-1);
}
.sci-eq-hint-toggle {
  text-align: center;
  margin-bottom: var(--space-4);
}
.sci-eq-hint-toggle button {
  font-size: var(--text-xs);
  color: var(--color-primary);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
}
.sci-eq-hint {
  font-size: var(--text-sm);
  color: var(--color-accent);
  text-align: center;
  margin-bottom: var(--space-3);
}
.sci-eq-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.sci-eq-formula-area {
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  border: 2px dashed var(--color-border);
}
.sci-eq-formula-area .sci-eq-selected {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-primary);
}
.sci-eq-formula {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.sci-eq-el-sym {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-base);
  color: var(--color-primary);
}
.sci-eq-el-emoji { font-size: 0.9rem; }
.sci-eq-placeholder {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.sci-eq-undo {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-4);
}
.sci-eq-elements-palette {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-4);
}
.sci-eq-element-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  transition: all 0.15s ease;
  min-width: 56px;
}
.sci-eq-element-btn:hover {
  border-color: var(--color-primary);
  background: rgba(231, 76, 110, 0.04);
  transform: translateY(-1px);
}
.sci-eq-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
}

/* Equation Builder Success */
.sci-eq-success {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  animation: sciPop 0.3s ease;
}
.sci-eq-success-emoji { font-size: 3.5rem; margin-bottom: var(--space-2); }
.sci-eq-success-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.sci-eq-success-formula {
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.sci-eq-success-explanation {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  text-align: left;
  padding: var(--space-4);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}
.sci-eq-success-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}
.sci-eq-all-done {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 2px solid #4CAF50;
  border-radius: var(--radius-lg);
}

/* ======== CONFETTI ANIMATION ======== */
.sci-confetti {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 9999;
  overflow: hidden;
}

@keyframes sciPop {
  0% { transform: scale(0.9); opacity: 0.5; }
  100% { transform: scale(1); opacity: 1; }
}

/* ======== RESPONSIVE ======== */
@media (max-width: 640px) {
  .sci-grid { grid-template-columns: 1fr; }
  .sci-elements-grid { grid-template-columns: 1fr; }
  .sci-states-grid { grid-template-columns: 1fr; }
  .sci-changes-grid { grid-template-columns: 1fr 1fr; }
  .sci-sorter-buttons { grid-template-columns: 1fr; gap: var(--space-2); }
  .sci-eq-challenge { padding: var(--space-3); }
  .sci-compound-card-big { padding: var(--space-4); }
}

/* -- Learned Badge -- */
.sci-learned-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: var(--radius-full);
  background: var(--feedback-correct-bg); color: var(--feedback-correct-text);
  font-size: var(--text-xs); font-weight: 700;
  border: 1px solid var(--feedback-correct-border);
}