/* ═══════════════════════════════════════════════════════════════════════════
   practice-test.css
   All styles for the Practice Test Generator window.
   Purely additive — zero changes to styles.css or reply-styles.css.
   Uses the same CSS variables as the rest of the app.
   ═══════════════════════════════════════════════════════════════════════════ */


/* ── Tooltips on disabled elements ───────────────────────────────────────────── */

[data-tooltip]:not([data-tooltip=""]) {
  position: relative;
}

[data-tooltip]:not([data-tooltip=""])::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a1a1f;
  color: #c8c8c0;
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 10.5px;
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.3px;
  white-space: nowrap;
  padding: 5px 10px;
  border-radius: 5px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 300;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

[data-tooltip]:not([data-tooltip=""]):hover::after {
  opacity: 1;
}

/* Session tab — appears below, anchored to right edge */
#ptTabSession[data-tooltip]:not([data-tooltip=""])::after {
  left: auto;
  right: 0;
  transform: none;
}

/* Generate button — appears ABOVE since it's at the bottom of the window */
#ptBtnGenerate[data-tooltip]:not([data-tooltip=""])::after {
  top: auto;
  bottom: calc(100% + 6px);
  left: auto;
  right: 0;
  transform: none;
}

/* ── Trigger button (bottom of sidebar) ─────────────────────────────────────── */

.practice-test-trigger {
  padding: 10px 14px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.btn-practice {
  width: 100%;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--text-mid);
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.6px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn-practice:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--text-dim);
}

.btn-practice svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0.7;
}

.btn-practice:hover svg {
  opacity: 1;
}


/* ── Dim overlay (behind window, above app) ──────────────────────────────────── */

.pt-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.pt-overlay.pt-visible {
  opacity: 1;
  pointer-events: auto;
}


/* ── Window shell ────────────────────────────────────────────────────────────── */

.pt-window {
  position: fixed;
  z-index: 200;
  width: 520px;
  /* height is flexible — footer is sticky inside */
  max-height: 78vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: 12px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  /* JS sets left/top; default centre is applied by practice-test.js */
  transition: box-shadow 0.2s;
}

.pt-window[hidden] { display: none; }

/* Entrance animation */
@keyframes ptSlideIn {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0)   scale(1);    }
}

.pt-window.pt-entering {
  animation: ptSlideIn 0.2s ease forwards;
}


/* ── Header / drag handle ────────────────────────────────────────────────────── */

.pt-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  cursor: default;
  user-select: none;
  flex-shrink: 0;
}



.pt-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pt-header-icon {
  width: 14px;
  height: 14px;
  color: var(--text-dim);
  flex-shrink: 0;
}

.pt-title {
  font-family: 'Geist Mono', monospace;
  font-style: normal;
  font-size: 11px;
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text);
}

.pt-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
  padding: 0;
  flex-shrink: 0;
}

.pt-close svg {
  width: 14px;
  height: 14px;
}

.pt-close:hover {
  color: var(--text);
  background: var(--surface-hover);
}


/* ── Body (scrollable content area) ─────────────────────────────────────────── */

.pt-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}

.pt-body-hidden { display: none !important; }

.pt-body::-webkit-scrollbar { width: 4px; }
.pt-body::-webkit-scrollbar-track { background: transparent; }
.pt-body::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 2px; }


/* ── Source tabs ─────────────────────────────────────────────────────────────── */

.pt-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  flex-shrink: 0;
  overflow: visible;
  position: relative;
  z-index: 10;
}

.pt-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 30px;
  background: none;
  border: none;
  border-radius: 5px;
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  padding: 0 6px;
}

.pt-tab svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.pt-tab:hover:not(.pt-tab-disabled) {
  color: var(--text-mid);
  background: var(--surface-hover);
}

.pt-tab.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.pt-tab.pt-tab-disabled {
  opacity: 0.35;
  cursor: not-allowed;
}


/* ── Tab panels ──────────────────────────────────────────────────────────────── */

.pt-tab-panels {
  flex-shrink: 0;
}

.pt-panel-hidden { display: none !important; }


/* ── Upload / dropzone ───────────────────────────────────────────────────────── */

.pt-dropzone {
  border: 1px dashed var(--border-hi);
  border-radius: 8px;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  text-align: center;
}

.pt-dropzone:hover,
.pt-dropzone.pt-drag-over {
  border-color: var(--text-dim);
  background: var(--surface-hover);
  box-shadow: none;
}

.pt-drop-icon {
  width: 28px;
  height: 28px;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.pt-drop-label {
  font-size: 12px;
  color: var(--text-mid);
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.2px;
}

.pt-drop-sub {
  font-size: 11px;
  color: var(--text-dim);
  font-family: 'Geist Mono', monospace;
}

.pt-browse-link {
  background: none;
  border: none;
  color: var(--text-mid);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 0;
  transition: color 0.15s;
}

.pt-browse-link:hover { color: var(--text); }


/* ── File chips ──────────────────────────────────────────────────────────────── */

.pt-file-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.pt-file-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 8px 4px 7px;
  font-size: 11px;
  color: var(--text-mid);
  font-family: 'Geist Mono', monospace;
  max-width: 200px;
}

.pt-file-chip-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.pt-file-chip-icon {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  color: var(--text-dim);
}

.pt-file-chip-remove {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: color 0.15s;
}

.pt-file-chip-remove:hover { color: var(--danger); }


/* ── Inline file error ───────────────────────────────────────────────────────── */

.pt-file-error {
  font-size: 11.5px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  color: var(--danger);
  padding: 0 2px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.2s ease, opacity 0.2s ease, margin-top 0.2s ease;
  margin-top: 0;
}

.pt-file-error.pt-file-error-visible {
  max-height: 40px;
  opacity: 1;
  margin-top: 6px;
}


/* ── Paste text ──────────────────────────────────────────────────────────────── */

.pt-textarea-wrap {
  position: relative;
}

.pt-textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border-hi);
  border-radius: 8px;
  padding: 10px 12px 24px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 12.5px;
  color: var(--text);
  resize: none;
  outline: none;
  transition: border-color 0.15s;
  line-height: 1.65;
  min-height: 130px;
  max-height: 220px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}

.pt-textarea::placeholder { color: var(--text-dim); }
.pt-textarea:focus { border-color: var(--text-dim); }

.pt-char-count {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-size: 10px;
  font-family: 'Geist Mono', monospace;
  color: var(--text-dim);
  pointer-events: none;
}


/* ── Session info box ────────────────────────────────────────────────────────── */

.pt-session-info {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 12.5px;
  color: var(--text-mid);
  line-height: 1.6;
}

.pt-session-empty {
  color: var(--text-dim);
  font-style: italic;
}

.pt-session-active {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pt-session-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.pt-session-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pip-live);
  flex-shrink: 0;
}

.pt-session-desc {
  font-size: 12.5px;
  color: var(--text);
}

.pt-session-meta {
  font-size: 11px;
  color: var(--text-dim);
}


/* ── Config section ──────────────────────────────────────────────────────────── */

.pt-config {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  flex-shrink: 0;
}

.pt-config-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.pt-config-row + .pt-config-row {
  padding-top: 4px;
}

.pt-config-row-types {
  align-items: flex-start;
}

.pt-field-label {
  font-size: 9px;
  font-family: 'Geist Mono', monospace;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-dim);
  flex-shrink: 0;
  width: 80px;
  padding-top: 1px;
}


/* ── Difficulty pills ────────────────────────────────────────────────────────── */

.pt-difficulty-pills {
  display: flex;
  gap: 5px;
}

.pt-pill {
  height: 28px;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--border-hi);
  border-radius: 5px;
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.pt-pill:hover:not(.active) {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--text-dim);
}

.pt-pill.active {
  background: var(--text);
  color: var(--bg);
  border-color: transparent;
  font-weight: 500;
}


/* ── Question count slider ───────────────────────────────────────────────────── */

.pt-question-pills {
  display: flex;
  gap: 5px;
}


/* ── Question count pills ─────────────────────────────────────────────────── */

.pt-q-pills {
  display: flex;
  gap: 5px;
}

.pt-q-pill {
  height: 28px;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--border-hi);
  border-radius: 5px;
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.4px;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.pt-q-pill:hover:not(.active) {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--text-dim);
}

.pt-q-pill.active {
  background: var(--text);
  color: var(--bg);
  border-color: transparent;
  font-weight: 500;
}


/* ── Question type checkboxes ────────────────────────────────────────────────── */

.pt-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pt-check-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.3px;
  color: var(--text-mid);
  cursor: pointer;
  user-select: none;
  transition: color 0.15s;
}

.pt-check-label:hover { color: var(--text); }

.pt-check-label input[type="checkbox"] { display: none; }

.pt-check-box {
  width: 16px;
  height: 16px;
  border: 1px solid var(--border-hi);
  border-radius: 4px;
  background: var(--surface-2);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s;
  position: relative;
}

.pt-check-label input:checked + .pt-check-box {
  background: var(--text);
  border-color: transparent;
}

.pt-check-label input:checked + .pt-check-box::after {
  content: '';
  display: block;
  width: 8px;
  height: 5px;
  border-left: 1.5px solid var(--bg);
  border-bottom: 1.5px solid var(--bg);
  transform: rotate(-45deg) translateY(-1px);
}


/* ── Footer ──────────────────────────────────────────────────────────────────── */

.pt-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  padding: 14px 18px;
  background: var(--surface);
}

.pt-footer-config {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pt-footer-hidden { display: none !important; }

.pt-footer-hint {
  flex: 1;
  font-size: 11px;
  font-family: 'Geist Mono', monospace;
  color: var(--text-mid);
  font-style: normal;
  opacity: 0.7;
}

.pt-generate-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 140px;
  justify-content: center;
  height: 36px !important;
  width: auto !important;
  padding: 0 18px;
  font-family: 'Geist Mono', monospace !important;
  font-size: 11px !important;
  letter-spacing: 0.5px !important;
  border-radius: 7px !important;
}

.pt-generate-btn:not(:disabled):hover {
  border-color: var(--text-dim) !important;
}

.pt-gen-icon {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

.pt-gen-spinner { display: none; }

.pt-generate-btn.is-loading .pt-gen-icon    { display: none; }
.pt-generate-btn.is-loading .pt-gen-spinner { display: flex; }
.pt-generate-btn.is-loading                 { opacity: 0.6; cursor: not-allowed; }

@keyframes ptSpin {
  to { transform: rotate(360deg); }
}

.pt-spinner-svg {
  width: 14px;
  height: 14px;
  animation: ptSpin 0.7s linear infinite;
  color: var(--bg);
}

/* Results footer */
.pt-footer-results {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.pt-export-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 14px;
  font-size: 11.5px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

.pt-export-btn svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}


/* ── Results view ────────────────────────────────────────────────────────────── */

.pt-result-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-bottom: 2px;
}

.pt-back-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-hi);
  color: var(--text);
  font-size: 11.5px;
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.3px;
  cursor: pointer;
  padding: 5px 10px;
  border-radius: 7px;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}

.pt-back-btn svg {
  width: 13px;
  height: 13px;
}

.pt-back-btn:hover {
  color: var(--text);
  background: rgba(255,255,255,0.09);
  border-color: var(--text-dim);
}

.pt-result-title {
  font-size: 11px;
  font-family: 'Geist Mono', monospace;
  color: var(--text-dim);
  letter-spacing: 0.4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}


/* ── Skeleton loader ─────────────────────────────────────────────────────────── */

.pt-skeleton {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 4px 0;
}

.pt-skeleton[hidden] { display: none; }

@keyframes ptShimmer {
  0%   { background-position: -400px 0; }
  100% { background-position:  400px 0; }
}

.pt-skeleton-line {
  height: 12px;
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    var(--surface-2) 25%,
    var(--surface-hover) 50%,
    var(--surface-2) 75%
  );
  background-size: 800px 100%;
  animation: ptShimmer 1.4s ease infinite;
}

.pt-skeleton-gap { height: 8px; }

.pt-skel-w55 { width: 55%; }
.pt-skel-w60 { width: 60%; }
.pt-skel-w65 { width: 65%; }
.pt-skel-w70 { width: 70%; }
.pt-skel-w80 { width: 80%; }
.pt-skel-w85 { width: 85%; }
.pt-skel-w90 { width: 90%; }


/* ── Rendered test content ───────────────────────────────────────────────────── */

.pt-result-content {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text);
}

.pt-result-content h1 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

.pt-result-content h2 {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-mid);
  margin: 28px 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-family: 'Geist Mono', monospace;
  border-bottom: 1px solid var(--border);
  padding-bottom: 5px;
}

.pt-result-content h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin: 16px 0 6px;
}

/* Each question paragraph — give it card-like separation */
.pt-result-content p {
  margin-bottom: 0;
  color: var(--text);
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  margin-bottom: 10px;
}

/* Answer key list items don't need the card treatment */
.pt-result-content h2 ~ ul,
.pt-result-content h2 ~ ol {
  background: none;
  border: none;
  padding: 0;
}

.pt-result-content ol {
  padding-left: 0;
  margin: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pt-result-content ul {
  padding-left: 18px;
  margin: 6px 0 12px;
}

.pt-result-content li {
  line-height: 1.75;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
}

/* Answer key items — lighter style */
.pt-result-content h2 ~ ul li,
.pt-result-content h2 ~ ol li {
  background: none;
  border: none;
  border-top: 1px solid var(--border);
  border-radius: 0;
  padding: 10px 4px;
  font-size: 12.5px;
  color: var(--text-mid);
}

.pt-result-content li::marker { color: var(--text-dim); }

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

.pt-result-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.pt-result-content code {
  font-size: 11.5px;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--code-inline-bg);
  border: 1px solid var(--border-hi);
  font-family: 'Geist Mono', monospace;
}

.pt-result-content pre {
  background: var(--code-block-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  margin: 10px 0;
  overflow-x: auto;
  font-size: 11.5px;
  line-height: 1.55;
}

.pt-result-content pre code {
  background: none;
  border: none;
  padding: 0;
}

.pt-result-content .katex { font-size: 1em; }

.pt-result-content .katex-display {
  margin: 12px 0;
  overflow-x: auto;
}


/* ── Responsive — Tablet (≤ 768px) ──────────────────────────────────────────── */

@media (max-width: 768px) {
  .pt-window {
    width: min(520px, calc(100vw - 32px));
  }

  .pt-footer-results {
    flex-wrap: wrap;
  }

  .pt-export-btn {
    flex: 1;
    justify-content: center;
  }
}


/* ── Responsive — Mobile (≤ 600px) ──────────────────────────────────────────── */

@media (max-width: 600px) {
  /* Window: full-width sheet pinned to bottom of screen */
  .pt-window {
    width: 100% !important;
    max-height: 90vh !important;
    left: 0 !important;
    right: 0 !important;
    top: auto !important;
    bottom: 0 !important;
    border-radius: 16px 16px 0 0;
    /* Disable drag positioning on mobile */
    touch-action: none;
  }

  /* Drag handle visual cue instead of cursor grab */
  .pt-header {
    cursor: default;
    padding: 14px 16px 13px;
  }

  .pt-header::before {
    content: '';
    display: block;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 4px;
    border-radius: 2px;
    background: var(--border-hi);
  }

  /* Slide up from bottom instead of scale-in */
  @keyframes ptSlideIn {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  /* Tabs: shrink text, hide icons */
  .pt-tab {
    font-size: 10px;
    padding: 0 4px;
    gap: 3px;
  }

  .pt-tab svg { display: none; }

  /* Config rows: stack vertically */
  .pt-config-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .pt-field-label {
    width: auto;
    margin-bottom: 0;
  }

  /* Difficulty pills: fill available width */
  .pt-difficulty-pills {
    width: 100%;
  }

  .pt-pill {
    flex: 1;
    text-align: center;
    padding: 0 8px;
  }

  /* Slider: full width */
  .pt-slider-wrap {
    width: 100%;
  }

  /* Checkboxes: two columns */
  .pt-checkboxes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
  }

  /* Footer: stack generate button full-width */
  .pt-footer-config {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .pt-footer-hint {
    text-align: center;
    order: 2;
  }

  .pt-generate-btn {
    width: 100% !important;
    min-width: unset;
    order: 1;
    height: 42px !important;
    font-size: 13px !important;
  }

  /* Results footer: stack buttons */
  .pt-footer-results {
    flex-direction: column;
    gap: 8px;
  }

  .pt-export-btn {
    width: 100%;
    justify-content: center;
    height: 40px;
  }

  /* File chips: allow full width */
  .pt-file-chip {
    max-width: 100%;
    width: 100%;
  }

  /* Dropzone: tighter padding */
  .pt-dropzone {
    padding: 20px 16px;
  }

  /* Result topbar: truncate title tighter */
  .pt-result-title {
    max-width: calc(100vw - 120px);
  }

  /* Tooltip: prevent overflow off-screen edges */
  [data-tooltip]:not([data-tooltip=""])::after {
    white-space: normal;
    max-width: min(240px, 70vw);
    text-align: center;
  }
}


/* ── Session picker (saved chats) ────────────────────────────────────────── */

.pt-sess-picker {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pt-sess-picker-label {
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin: 0;
  padding: 0 2px;
}

.pt-sess-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 160px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}

.pt-sess-list::-webkit-scrollbar       { width: 3px; }
.pt-sess-list::-webkit-scrollbar-track { background: transparent; }
.pt-sess-list::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 4px; }

.pt-sess-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
  flex-shrink: 0;
}

.pt-sess-row:hover {
  border-color: var(--border-hi);
  background: var(--surface-hover);
}

.pt-sess-selected {
  border-color: var(--accent) !important;
  background: rgba(var(--accent-rgb), 0.06) !important;
}

.pt-sess-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pt-sess-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.pt-sess-title {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pt-sess-sub {
  font-size: 10.5px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pt-sess-check {
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-left: 4px;
}

/* "Live" badge on the active session row */
.pt-sess-live-badge {
  display: inline-flex;
  align-items: center;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #4ade80;
  background: rgba(74, 222, 128, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: 20px;
  padding: 1px 6px;
  flex-shrink: 0;
}


/* ── Subject picker overlay ──────────────────────────────────────────────────── */

.pt-subject-picker-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  border-radius: inherit;
  animation: pt-fade-in 0.15s ease;
}

@keyframes pt-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.pt-subject-picker-card {
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: 10px;
  padding: 20px 20px 16px;
  width: min(340px, calc(100% - 32px));
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.45);
}

.pt-subject-picker-label {
  font-size: 12px;
  color: var(--text-mid);
  line-height: 1.6;
  text-align: center;
  margin: 0;
}

.pt-subject-pick-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pt-subject-pick-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 14px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--text);
  text-align: left;
  transition: border-color 0.12s, background 0.12s;
}

.pt-subject-pick-btn:hover {
  border-color: var(--subject-color, var(--border-hi));
  background: var(--surface);
}

.pt-pick-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pt-pick-name {
  flex: 1;
  font-weight: 500;
}

.pt-pick-msgs {
  font-size: 10.5px;
  color: var(--text-dim);
  letter-spacing: 0.3px;
}

.pt-subject-pick-all {
  width: 100%;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  transition: color 0.12s, border-color 0.12s;
}

.pt-subject-pick-all:hover {
  color: var(--text);
  border-color: var(--border-hi);
}

/* ── Subject picker back button ───────────────────────────────────────────── */

.pt-subject-picker-header {
  display: flex;
  align-items: center;
  margin-bottom: -4px;
}

.pt-subject-picker-back {
  display: flex;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  padding: 2px 0;
  cursor: pointer;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  transition: color 0.12s;
}

.pt-subject-picker-back:hover {
  color: var(--text);
}


/* ── Flashcard button ────────────────────────────────────────────────────────*/

.btn-flashcards {
  border-color: var(--border-hi);
}

/* ── Flashcard window ────────────────────────────────────────────────────────*/

.fc-window {
  width: 480px;
}

.fc-header {
  user-select: none;
}

.fc-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 24px 16px;
  min-height: 280px;
}

/* Skeleton */
.fc-skeleton {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  align-items: center;
}

/* Card */
.fc-card-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  perspective: 1000px;
}

.fc-card {
  width: 100%;
  max-width: 400px;
  height: 260px;
  cursor: pointer;
  position: relative;
}

.fc-card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fc-card-inner.flipped {
  transform: rotateY(180deg);
}

.fc-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid var(--border-hi);
  border-radius: 12px;
  background: var(--surface-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 28px 24px;
  gap: 10px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.18);
  transition: box-shadow 0.2s, opacity 0.35s ease;
}

.fc-card:hover .fc-face {
  box-shadow: 0 4px 24px rgba(0,0,0,0.28);
}

.fc-face-front {
  border-top: 2px solid var(--accent);
  opacity: 1;
}

.fc-card-inner.flipped .fc-face-front {
  opacity: 0;
}

.fc-face-back {
  transform: rotateY(180deg);
  background: var(--surface-2);
  border-top: 2px solid var(--text-dim);
  opacity: 0;
}

.fc-card-inner.flipped .fc-face-back {
  opacity: 1;
}

.fc-face-label {
  font-family: 'Geist Mono', monospace;
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
  position: absolute;
  top: 13px;
  left: 16px;
}

.fc-face-text {
  font-size: 14px;
  color: var(--text);
  text-align: center;
  line-height: 1.6;
  font-weight: 300;
  max-height: 200px;
  overflow-y: auto;
}

.fc-face-front .fc-face-text {
  font-size: 15px;
  font-weight: 400;
  color: var(--text);
}

.fc-face-text code {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  background: rgba(255,255,255,0.06);
  padding: 2px 6px;
  border-radius: 4px;
}

.fc-tap-hint {
  position: absolute;
  bottom: 13px;
  right: 16px;
  font-size: 9px;
  color: var(--text-dim);
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.4px;
  opacity: 0.7;
}

/* Controls */
.fc-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 16px 16px;
  border-top: 1px solid var(--border);
  width: 100%;
}

.fc-nav-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  color: var(--text-mid);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.fc-nav-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.fc-counter {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  color: var(--text-dim);
  min-width: 40px;
  text-align: center;
  letter-spacing: 0.4px;
}

.fc-shuffle-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 10px;
  background: transparent;
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  color: var(--text-mid);
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.5px;
  cursor: pointer;
  margin-left: 6px;
  transition: background 0.15s, color 0.15s;
}

.fc-shuffle-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
}

/* Error */
.fc-error {
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
  padding: 20px;
}

/* ── Flashcard generate button ───────────────────────────────────────────────*/

.fc-generate-btn {
  width: 100%;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--text-mid);
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.6px;
  cursor: pointer;
  border-radius: 6px;
  margin-top: 4px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.fc-generate-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--text-dim);
}