/* ============================================================
   LEARN YOUR WAY — workspace.css
   Styles specific to learn.html
   ============================================================ */

/* --- Workspace layout -------------------------------------- */
.workspace {
  min-height: calc(100vh - 61px);
  padding-bottom: 80px;
}

.ws-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 20px 0;
}

.ws-section {
  animation: fadeIn 0.25s ease;
}

.ws-heading {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.2;
}

.ws-heading-sm {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4vw, 1.6rem);
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

.ws-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.ws-sub-sm {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

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

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

/* --- Input ------------------------------------------------- */
.material-input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 16px;
  resize: vertical;
  min-height: 160px;
  transition: border-color 0.2s;
  -webkit-appearance: none;
}

.material-input::placeholder {
  color: var(--text-tertiary);
}

.material-input:focus {
  outline: none;
  border-color: var(--text-secondary);
}

.input-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
}

/* --- Ghost button variant ---------------------------------- */
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 12px 20px;
  font-size: 0.88rem;
}

.btn-ghost:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-sm {
  padding: 10px 18px;
  font-size: 0.85rem;
  min-height: 40px;
}

/* --- Material preview -------------------------------------- */
.material-preview {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 28px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-height: 100px;
  overflow: hidden;
  position: relative;
}

.material-preview::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 36px;
  background: linear-gradient(transparent, var(--surface));
}

/* --- Mode buttons ------------------------------------------ */
.mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.mode-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 16px;
  cursor: pointer;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.15s, background 0.15s;
  -webkit-tap-highlight-color: transparent;
  min-height: 100px;
}

.mode-btn:hover,
.mode-btn:focus-visible {
  border-color: var(--text-secondary);
  background: var(--surface-2);
}

.mode-btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

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

.mode-btn-icon {
  font-size: 1.1rem;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}

.mode-btn-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.mode-btn-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* --- Active mode bar --------------------------------------- */
.active-mode-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.active-mode-icon {
  font-size: 0.95rem;
  color: var(--text-tertiary);
}

.active-mode-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* --- Loading ----------------------------------------------- */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 48px 0;
}

.loading-dots {
  display: flex;
  gap: 6px;
}

.loading-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-tertiary);
  animation: pulse 1.2s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes pulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.85); }
  40%           { opacity: 1;   transform: scale(1); }
}

.loading-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* --- Explanation output ------------------------------------ */
.explanation-output {
  margin-bottom: 32px;
}

.explanation-content {
  font-size: 0.97rem;
  color: var(--text-primary);
  line-height: 1.8;
}

/* Text styles inside explanation */
.explanation-content p {
  margin-bottom: 16px;
}

.explanation-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.explanation-content em {
  color: var(--text-secondary);
  font-style: italic;
}

/* Visual diagram styles */
.ai-diagram {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  margin: 16px 0;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.ai-diagram-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 16px;
  font-size: 0.88rem;
  color: var(--text-primary);
  width: 100%;
}

.ai-diagram-arrow {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  padding-left: 16px;
}

/* Step list in explanation */
.ai-steps {
  list-style: none;
  counter-reset: ai-step;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 16px 0;
}

.ai-steps li {
  counter-increment: ai-step;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 0.93rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.ai-steps li::before {
  content: counter(ai-step);
  min-width: 26px;
  height: 26px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* --- Listen bar -------------------------------------------- */
.listen-bar {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.btn-listen {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 18px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  min-height: 44px;
}

.btn-listen:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-listen:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.btn-listen.listening {
  border-color: var(--text-primary);
  color: var(--text-primary);
}

/* --- Error state ------------------------------------------- */
.error-state {
  text-align: center;
  padding: 40px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.error-icon {
  font-size: 1.5rem;
  color: var(--text-tertiary);
}

.error-message {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 300px;
  line-height: 1.5;
}

/* --- Rethink section --------------------------------------- */
.rethink-section {
  border-top: 1px solid var(--border);
  padding-top: 28px;
  margin-bottom: 24px;
}

.rethink-label {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 14px;
}

.rethink-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rethink-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 13px 16px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  min-height: 48px;
  -webkit-tap-highlight-color: transparent;
}

.rethink-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
  background: var(--surface-2);
}

.rethink-btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

.rethink-btn:active {
  transform: scale(0.99);
}

.rethink-icon {
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* --- Bottom actions ---------------------------------------- */
.bottom-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 8px;
}

/* --- Practice --------------------------------------------- */
.practice-questions {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 28px;
}

.practice-q {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.practice-q-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.5;
}

.practice-q-num {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-bottom: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Multiple choice options */
.mc-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mc-option {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-primary);
  text-align: left;
  transition: border-color 0.15s;
  min-height: 48px;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}

.mc-option:hover {
  border-color: var(--text-secondary);
}

.mc-option.selected {
  border-color: var(--text-primary);
  background: var(--surface);
}

.mc-option.correct {
  border-color: #888;
  background: var(--surface-2);
}

.mc-option.incorrect {
  border-color: var(--text-tertiary);
  opacity: 0.6;
}

.mc-letter {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

/* Short answer */
.short-answer-input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 12px 14px;
  resize: none;
  min-height: 80px;
  transition: border-color 0.2s;
}

.short-answer-input:focus {
  outline: none;
  border-color: var(--text-secondary);
}

/* Practice actions */
.practice-actions {
  margin-bottom: 20px;
}

/* Practice results */
.practice-results {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.result-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
}

.result-status {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.result-status.correct { color: #4caf50; }
.result-status.incorrect { color: #e53935; }

.result-q {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.result-answer {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
}

.result-explanation {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.5;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* Practice nav */
.practice-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 8px;
}

/* --- Key term highlights ----------------------------------- */
.key-term {
  border-bottom: 2px solid var(--text-tertiary);
  cursor: help;
  font-weight: 500;
}

.key-term:hover {
  border-bottom-color: var(--text-primary);
  color: var(--text-primary);
}

.key-terms-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.key-terms-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  width: 100%;
  margin-bottom: 4px;
}

.key-term-chip {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
}

/* --- Language selector ------------------------------------- */
.lang-selector {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.lang-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.lang-buttons {
  display: flex;
  gap: 8px;
}

.lang-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 6px 16px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  min-height: 36px;
}

.lang-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary-bg);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* --- History panel ----------------------------------------- */
.history-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  padding: 20px;
  z-index: 200;
  max-height: 70vh;
  overflow-y: auto;
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.history-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.history-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 8px;
  min-height: 36px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.history-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  transition: border-color 0.15s;
}

.history-item:hover {
  border-color: var(--text-secondary);
}

.history-item-mode {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.history-item-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.history-empty {
  font-size: 0.88rem;
  color: var(--text-tertiary);
  text-align: center;
  padding: 24px 0;
}

/* --- Nav icon button --------------------------------------- */
.btn-nav-icon {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s;
}

.btn-nav-icon:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

/* --- Demo hint --------------------------------------------- */
.demo-hint {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

.demo-hint-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.demo-hint-btn:hover {
  color: var(--text-primary);
}

/* --- Hamburger menu ---------------------------------------- */
.hamburger-btn {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  transition: border-color 0.2s;
}

.hamburger-btn span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: background 0.2s;
}

.hamburger-btn:hover {
  border-color: var(--text-secondary);
}

.hamburger-btn:hover span {
  background: var(--text-primary);
}

.hamburger-menu {
  position: absolute;
  top: 58px;
  right: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  z-index: 200;
  min-width: 180px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  animation: fadeIn 0.15s ease;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  background: none;
  border: none;
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 12px 14px;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s;
  min-height: 44px;
}

.menu-item:hover {
  background: var(--surface-2);
}

.menu-item-icon {
  color: var(--text-tertiary);
  font-size: 1rem;
  width: 20px;
  text-align: center;
}

/* --- Override hamburger to dots style ---------------------- */
.hamburger-btn {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0;
  flex-direction: row;
}

.hamburger-btn span { display: none; }