/**
 * Lecture Mind - Component Library
 *
 * Premium component styles using design tokens
 * All components use data-* attributes for variants
 */

/* ============================================
   BASE RESET & GLOBAL STYLES
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--foreground);
  background-color: var(--background);
  transition: background-color var(--duration-slow) var(--ease-out),
              color var(--duration-slow) var(--ease-out);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* Skip to main content - accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-tooltip);
  padding: var(--space-2) var(--space-4);
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius-md);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--foreground);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: var(--tracking-tight);
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: var(--tracking-tight);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  margin: 0;
  color: var(--foreground);
}

.text-muted {
  color: var(--foreground-muted);
}

.text-primary {
  color: var(--primary);
}

.text-success {
  color: var(--success);
}

.text-warning {
  color: var(--warning);
}

.text-error {
  color: var(--error);
}

/* ============================================
   BUTTON COMPONENT
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  white-space: nowrap;
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--duration-normal) var(--ease-spring);
  user-select: none;
}

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

.btn:disabled {
  pointer-events: none;
  opacity: 0.5;
}

/* Button Sizes */
.btn[data-size="sm"] {
  height: var(--btn-height-sm);
  padding: 0 var(--space-3);
  font-size: var(--text-xs);
}

.btn[data-size="md"],
.btn:not([data-size]) {
  height: var(--btn-height-md);
  padding: 0 var(--space-4);
}

.btn[data-size="lg"] {
  height: var(--btn-height-lg);
  padding: 0 var(--space-6);
  font-size: var(--text-base);
}

.btn[data-size="icon"] {
  width: var(--btn-height-md);
  height: var(--btn-height-md);
  padding: 0;
}

/* Button Variants */
.btn[data-variant="primary"],
.btn:not([data-variant]) {
  background: var(--primary);
  color: var(--primary-foreground);
}

.btn[data-variant="primary"]:hover,
.btn:not([data-variant]):hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn[data-variant="primary"]:active,
.btn:not([data-variant]):active {
  transform: translateY(0);
}

.dark .btn[data-variant="primary"]:hover,
.dark .btn:not([data-variant]):hover {
  box-shadow: var(--shadow-glow-sm);
}

.btn[data-variant="secondary"] {
  background: var(--surface-elevated);
  color: var(--foreground);
  border: 1px solid var(--border);
}

.btn[data-variant="secondary"]:hover {
  background: var(--background-subtle);
  border-color: var(--border-focus);
}

.btn[data-variant="ghost"] {
  background: transparent;
  color: var(--foreground);
}

.btn[data-variant="ghost"]:hover {
  background: var(--background-subtle);
}

.btn[data-variant="destructive"] {
  background: var(--error);
  color: var(--color-white);
}

.btn[data-variant="destructive"]:hover {
  background: var(--color-error-600);
}

/* ============================================
   INPUT COMPONENT
   ============================================ */
.input {
  display: flex;
  width: 100%;
  height: var(--input-height);
  padding: 0 var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--foreground);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.input::placeholder {
  color: var(--foreground-muted);
}

.input:hover {
  border-color: var(--foreground-muted);
}

.input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--glow-primary);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Input with icon */
.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.input-group .input {
  padding-left: var(--space-10);
}

.input-group .input-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--foreground-muted);
  pointer-events: none;
}

/* ============================================
   CARD COMPONENT
   ============================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-spring),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.card[data-hover="true"]:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-focus);
}

.dark .card[data-hover="true"]:hover {
  box-shadow: var(--shadow-glow-sm);
}

.card-header {
  padding: var(--card-padding);
  padding-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
}

.card-description {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.card-content {
  padding: var(--card-padding);
  padding-top: 0;
}

.card-footer {
  padding: var(--card-padding);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

/* ============================================
   BADGE COMPONENT
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-out);
}

.badge[data-variant="default"] {
  background: var(--background-subtle);
  color: var(--foreground);
}

.badge[data-variant="primary"] {
  background: var(--primary);
  color: var(--primary-foreground);
}

.badge[data-variant="success"] {
  background: var(--success-bg);
  color: var(--success);
}

.badge[data-variant="warning"] {
  background: var(--warning-bg);
  color: var(--warning);
}

.badge[data-variant="error"] {
  background: var(--error-bg);
  color: var(--error);
}

/* ============================================
   TABS COMPONENT
   ============================================ */
.tabs {
  display: flex;
  flex-direction: column;
}

.tabs-list {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tabs-trigger {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--foreground-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.tabs-trigger:hover {
  color: var(--foreground);
  background: var(--background-subtle);
}

.tabs-trigger[data-state="active"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tabs-content {
  padding: var(--space-6);
}

.tabs-content[data-state="inactive"] {
  display: none;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress {
  height: var(--space-2);
  background: var(--background-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--primary),
    var(--accent)
  );
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-spring);
}

.progress-bar[data-animated="true"] {
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
}

/* ============================================
   SKELETON LOADING
   ============================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--background-subtle) 25%,
    var(--border) 50%,
    var(--background-subtle) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-circle {
  border-radius: var(--radius-full);
}

.skeleton-card {
  height: 150px;
}

@media (prefers-reduced-motion: reduce) {
  .skeleton {
    animation: none;
    background: var(--background-subtle);
  }
}

/* ============================================
   TOAST / NOTIFICATION
   ============================================ */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideInRight var(--duration-slow) var(--ease-spring) forwards;
}

.toast[data-variant="success"] {
  border-color: var(--success);
}

.toast[data-variant="error"] {
  border-color: var(--error);
}

.toast[data-variant="warning"] {
  border-color: var(--warning);
}

.toast-icon {
  flex-shrink: 0;
  width: var(--space-5);
  height: var(--space-5);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.toast-close {
  flex-shrink: 0;
  padding: var(--space-1);
  color: var(--foreground-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out);
}

.toast-close:hover {
  color: var(--foreground);
}

/* ============================================
   UPLOAD ZONE
   ============================================ */
.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-12);
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius-2xl);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-spring);
}

.upload-zone:hover {
  border-color: var(--primary);
  background: var(--background-subtle);
}

.upload-zone[data-dragover="true"] {
  border-color: var(--primary);
  background: var(--background-subtle);
  transform: scale(1.01);
  box-shadow: var(--shadow-glow-md);
}

.upload-zone-icon {
  width: var(--space-16);
  height: var(--space-16);
  padding: var(--space-4);
  background: var(--background-subtle);
  border-radius: var(--radius-2xl);
  color: var(--foreground-muted);
  transition: all var(--duration-normal) var(--ease-out);
}

.upload-zone:hover .upload-zone-icon {
  color: var(--primary);
  background: var(--glow-primary);
}

.upload-zone-title {
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
}

.upload-zone-subtitle {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.upload-zone-formats {
  font-size: var(--text-xs);
  color: var(--foreground-muted);
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  text-align: center;
  overflow: hidden;
}

.empty-state-icon {
  width: 2.5rem !important;
  height: 2.5rem !important;
  max-width: 2.5rem !important;
  max-height: 2.5rem !important;
  min-width: 2.5rem;
  min-height: 2.5rem;
  flex-shrink: 0;
  margin-bottom: var(--space-3);
  color: var(--foreground-muted);
  opacity: 0.35;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-2);
}

.empty-state-description {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
  max-width: 300px;
}

/* ============================================
   EVENT CARD
   ============================================ */
.event-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-spring);
}

.event-card:hover {
  transform: translateX(4px);
  border-color: var(--border-focus);
  background: var(--background-subtle);
}

.event-card:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.event-card-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-10);
  height: var(--space-10);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-lg);
  color: var(--primary-foreground);
  font-weight: var(--font-semibold);
}

.event-card-content {
  flex: 1;
}

.event-card-timestamp {
  font-weight: var(--font-medium);
}

.event-card-confidence {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.event-card-arrow {
  color: var(--foreground-muted);
  transition: transform var(--duration-fast) var(--ease-out);
}

.event-card:hover .event-card-arrow {
  transform: translateX(4px);
}

/* ============================================
   SEARCH RESULT
   ============================================ */
.search-result {
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  transition: all var(--duration-fast) var(--ease-out);
}

.search-result:hover {
  border-color: var(--border-focus);
}

.search-result-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.search-result-timestamp {
  padding: var(--space-0_5) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--primary-foreground);
  border-radius: var(--radius-full);
}

.search-result-type {
  font-size: var(--text-xs);
  color: var(--foreground-muted);
}

.search-result-text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* Highlight matches */
.highlight {
  background: var(--warning);
  color: var(--color-black);
  padding: 0 var(--space-0_5);
  border-radius: var(--radius-sm);
}

.dark .highlight {
  background: var(--color-warning-500);
}

/* ============================================
   TRANSCRIPT CHUNK
   ============================================ */
.transcript-chunk {
  padding: var(--space-4);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
}

.transcript-chunk-time {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--primary);
  margin-bottom: var(--space-2);
}

.transcript-chunk-text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ============================================
   EXPORT OPTIONS
   ============================================ */
.export-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.export-option:hover {
  border-color: var(--border-focus);
  background: var(--background-subtle);
}

.export-option[data-selected="true"] {
  border-color: var(--primary);
  background: var(--glow-primary);
}

.export-option input[type="radio"] {
  accent-color: var(--primary);
}

.export-option-title {
  font-weight: var(--font-medium);
}

.export-option-description {
  font-size: var(--text-xs);
  color: var(--foreground-muted);
}

/* ============================================
   SPINNER
   ============================================ */
.spinner {
  width: var(--space-5);
  height: var(--space-5);
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

.spinner[data-size="sm"] {
  width: var(--space-4);
  height: var(--space-4);
}

.spinner[data-size="lg"] {
  width: var(--space-8);
  height: var(--space-8);
  border-width: 3px;
}

/* ============================================
   STREAMING CURSOR
   ============================================ */
.streaming-cursor {
  display: inline-block;
  width: 0.5em;
  height: 1em;
  background: var(--primary);
  margin-left: var(--space-0_5);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@media (prefers-reduced-motion: reduce) {
  .streaming-cursor {
    animation: none;
    opacity: 0.7;
  }
}

/* ============================================
   VIDEO PLAYER
   ============================================ */
.video-player-container {
  position: relative;
  width: 100%;
  background: var(--color-black);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

#video-player {
  width: 100%;
  max-height: 400px;
  display: block;
  background: var(--color-black);
}

#video-player-section {
  margin-top: var(--space-4);
}

/* Clickable timestamps */
.timestamp-link {
  cursor: pointer;
  color: var(--primary);
  font-weight: var(--font-medium);
  transition: all var(--duration-fast) var(--ease-out);
  border-bottom: 1px dashed var(--primary);
  padding-bottom: 1px;
}

.timestamp-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.timestamp-link:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Make event cards and transcript chunks clickable */
.event-card[data-timestamp],
.transcript-chunk[data-timestamp],
.search-result[data-timestamp] {
  cursor: pointer;
}

.event-card[data-timestamp]:hover,
.transcript-chunk[data-timestamp]:hover,
.search-result[data-timestamp]:hover {
  border-color: var(--primary);
}

/* Active seek indicator */
.event-card[data-active="true"],
.transcript-chunk[data-active="true"] {
  border-color: var(--primary);
  background: var(--glow-primary);
}

/* ============================================
   CONFUSION VOTING BUTTON
   ============================================ */
.confusion-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--foreground-muted);
  background: var(--background-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--duration-fast) var(--ease-out);
  z-index: 10;
}

/* Show on hover of parent */
.transcript-chunk:hover .confusion-btn,
.event-card:hover .confusion-btn,
.search-result:hover .confusion-btn {
  opacity: 1;
  transform: scale(1);
}

/* Always show when voted */
.confusion-btn.voted {
  opacity: 1;
  transform: scale(1);
  color: var(--warning);
  background: var(--warning-bg);
  border-color: var(--warning);
}

.confusion-btn:hover {
  color: var(--warning);
  background: var(--warning-bg);
  border-color: var(--warning);
  transform: scale(1.1);
}

.confusion-btn:focus-visible {
  opacity: 1;
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* Make parent elements position relative for button */
.transcript-chunk,
.event-card,
.search-result {
  position: relative;
}

/* ============================================
   CONFUSION MOMENTS LIST
   ============================================ */
.confusion-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.confusion-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.confusion-item:hover {
  border-color: var(--warning);
  background: var(--warning-bg);
}

.confusion-item:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.confusion-item-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--warning);
  background: var(--warning-bg);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.confusion-item-time {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--primary);
}

/* ============================================
   BOOKMARK FEATURE STYLES
   ============================================ */

/* Bookmark type colors */
.bookmark-icon--yellow { color: var(--color-warning-500); }
.bookmark-icon--blue { color: var(--color-info-500, #3b82f6); }
.bookmark-icon--green { color: var(--color-success-500, #22c55e); }
.bookmark-icon--orange { color: var(--color-warning-600, #ea580c); }

/* Bookmark item in list */
.bookmark-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.bookmark-item:hover {
  background: var(--background-subtle);
  border-color: var(--border-focus);
}

.bookmark-item:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

/* Color variants for bookmark items */
.bookmark-item--yellow:hover { border-color: var(--color-warning-500); }
.bookmark-item--blue:hover { border-color: var(--color-info-500, #3b82f6); }
.bookmark-item--green:hover { border-color: var(--color-success-500, #22c55e); }
.bookmark-item--orange:hover { border-color: var(--color-warning-600, #ea580c); }

.bookmark-item-icon {
  font-size: var(--text-lg);
  line-height: 1;
  flex-shrink: 0;
}

.bookmark-time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--primary);
  min-width: 50px;
}

.bookmark-note {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--foreground-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bookmark-delete {
  padding: var(--space-1);
  font-size: var(--text-sm);
  color: var(--foreground-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: all var(--duration-fast) var(--ease-out);
}

.bookmark-item:hover .bookmark-delete {
  opacity: 1;
}

.bookmark-delete:hover {
  color: var(--error);
  background: var(--error-bg);
}

/* Bookmark Type Selector Modal */
.bookmark-type-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  animation: fadeIn var(--duration-fast) var(--ease-out);
}

.bookmark-type-selector {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: var(--space-5);
  max-width: 360px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: scaleIn var(--duration-normal) var(--ease-spring);
}

.bookmark-type-title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--foreground-muted);
  margin-bottom: var(--space-3);
  text-align: center;
}

.bookmark-type-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.bookmark-type-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.bookmark-type-option:hover {
  background: var(--background-subtle);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.bookmark-type-option--yellow:hover { border-color: var(--color-warning-500); }
.bookmark-type-option--blue:hover { border-color: var(--color-info-500, #3b82f6); }
.bookmark-type-option--green:hover { border-color: var(--color-success-500, #22c55e); }
.bookmark-type-option--orange:hover { border-color: var(--color-warning-600, #ea580c); }

.bookmark-type-option-icon {
  font-size: var(--text-xl);
  line-height: 1;
}

.bookmark-type-option-label {
  flex: 1;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--foreground);
}

.bookmark-type-option-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: var(--space-0_5) var(--space-1);
  background: var(--background-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--foreground-muted);
}

.bookmark-type-hint {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  text-align: center;
}

/* Bookmark Note Modal */
.bookmark-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  animation: fadeIn var(--duration-fast) var(--ease-out);
}

.bookmark-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl);
  padding: var(--space-5);
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: scaleIn var(--duration-normal) var(--ease-spring);
}

.bookmark-modal-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.bookmark-icon {
  font-size: var(--text-2xl);
  line-height: 1;
}

.bookmark-modal-title-group {
  flex: 1;
}

.bookmark-modal-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin: 0;
}

.bookmark-modal-timestamp {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.bookmark-modal-note-group {
  margin-bottom: var(--space-4);
}

.bookmark-modal-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-2);
  color: var(--foreground);
}

.bookmark-modal-textarea {
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--foreground);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  resize: vertical;
  min-height: 80px;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.bookmark-modal-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--glow-primary);
}

.bookmark-modal-textarea::placeholder {
  color: var(--foreground-muted);
}

.bookmark-modal-buttons {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
}

/* Animation keyframes for modals */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================
   STUDY TOOLS - Premium UI Components
   ============================================ */

/* Study Tools Section */
.study-tools-section {
  padding: var(--space-6); /* Increased breathing room */
}

/* Study Tools Grid */
.study-tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5); /* Increased from space-3 for premium spacing */
  margin-bottom: var(--space-6);
}

/* Study Tool Card - Cognitive Psychology: Cards draw attention with depth */
.study-tool-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-5); /* Increased breathing room */
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-2xl); /* Premium radius matching main cards */
  transition: all var(--duration-normal) var(--ease-spring);
  cursor: pointer;
  overflow: hidden;
  /* Staggered entry animation */
  animation: studyCardEnter 0.5s var(--spring-bounce-1) backwards;
}

/* Staggered entry - Cognitive: Sequential reveal reduces cognitive load */
.study-tool-card:nth-child(1) { animation-delay: 0ms; }
.study-tool-card:nth-child(2) { animation-delay: 80ms; }
.study-tool-card:nth-child(3) { animation-delay: 160ms; }
.study-tool-card:nth-child(4) { animation-delay: 240ms; }

@keyframes studyCardEnter {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.study-tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(6, 182, 212, 0.05) 100%);
  opacity: 0;
  transition: opacity var(--duration-normal) ease;
}

/* Hover: Cognitive Psychology - Immediate feedback confirms interactivity */
.study-tool-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), 0 12px 40px -12px rgba(6, 182, 212, 0.15);
}

.study-tool-card:hover::before {
  opacity: 1;
}

/* Active: Haptic-like feedback - confirms click registered */
.study-tool-card:active {
  transform: translateY(-2px) scale(0.98);
  transition-duration: var(--duration-micro);
}

/* Dark mode: Enhanced glow for depth perception */
.dark .study-tool-card:hover {
  box-shadow:
    0 8px 32px rgba(6, 182, 212, 0.25),
    0 2px 12px rgba(6, 182, 212, 0.15),
    0 0 0 1px rgba(6, 182, 212, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
  border-color: rgba(6, 182, 212, 0.3);
}

/* Study Tool Icon - Cognitive: Visual anchor establishes hierarchy */
.study-tool-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3); /* Increased spacing */
  transition: transform var(--duration-medium) var(--spring-bounce-1);
  flex-shrink: 0;
  /* Subtle pulse to draw attention */
  animation: iconPulse 3s ease-in-out infinite;
}

@keyframes iconPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

/* Hover: Spring bounce for delight */
.study-tool-card:hover .study-tool-icon {
  transform: scale(1.12) rotate(6deg);
  animation: none; /* Stop pulse on hover */
}

/* Icon SVG - Optimized 50% fill ratio */
.study-tool-icon svg {
  width: 20px;
  height: 20px;
}

/* Icon colors with subtle borders for definition */
.study-tool-icon--quiz {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.08));
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(139, 92, 246, 0.2);
}

.study-tool-icon--flashcards {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(6, 182, 212, 0.08));
  color: var(--primary);
  box-shadow: inset 0 0 0 1px rgba(6, 182, 212, 0.2);
}

.study-tool-icon--share {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.08));
  color: var(--success);
  box-shadow: inset 0 0 0 1px rgba(34, 197, 94, 0.2);
}

.study-tool-icon--notes {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.08));
  color: var(--warning);
  box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.2);
}

/* Dark mode icon glows */
.dark .study-tool-card:hover .study-tool-icon--quiz {
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.4);
}
.dark .study-tool-card:hover .study-tool-icon--flashcards {
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
}
.dark .study-tool-card:hover .study-tool-icon--share {
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.4);
}
.dark .study-tool-card:hover .study-tool-icon--notes {
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
}

/* Typography - Cognitive: Clear hierarchy aids scanning */
.study-tool-title {
  font-size: var(--text-base); /* Increased for better hierarchy */
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
  color: var(--foreground);
}

.study-tool-desc {
  font-size: var(--text-sm); /* Increased for readability */
  color: var(--foreground-muted);
  margin-bottom: var(--space-3);
  line-height: 1.5; /* Improved line height */
}

.study-tool-btn {
  width: 100%;
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-3);
}

/* Study Panels */
.study-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  animation: slideUpFade 0.3s var(--ease-spring);
}

@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.study-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  background: var(--background-subtle);
}

.study-panel-header h4 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin: 0;
}

/* ============================================
   QUIZ UI
   ============================================ */
.quiz-content {
  padding: var(--space-4);
  min-height: 200px;
}

.quiz-question {
  margin-bottom: var(--space-4);
}

.quiz-question-text {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.quiz-option:hover {
  border-color: var(--primary);
  background: var(--background-subtle);
}

.quiz-option[data-selected="true"] {
  border-color: var(--primary);
  background: var(--glow-primary);
}

.quiz-option[data-correct="true"] {
  border-color: var(--success);
  background: var(--success-bg);
}

.quiz-option[data-incorrect="true"] {
  border-color: var(--error);
  background: var(--error-bg);
}

.quiz-option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  background: var(--background-subtle);
  border-radius: var(--radius-full);
  flex-shrink: 0;
  transition: all var(--duration-fast) var(--ease-out);
}

.quiz-option:hover .quiz-option-letter {
  background: var(--primary);
  color: var(--primary-foreground);
}

.quiz-option[data-selected="true"] .quiz-option-letter {
  background: var(--primary);
  color: var(--primary-foreground);
}

.quiz-option-text {
  font-size: var(--text-sm);
  line-height: 1.5;
}

.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--background-subtle);
}

.quiz-progress {
  font-size: var(--text-sm);
  color: var(--foreground-muted);
}

.quiz-score {
  text-align: center;
  padding: var(--space-6);
}

.quiz-score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  animation: scoreReveal 0.5s var(--ease-spring);
}

@keyframes scoreReveal {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.quiz-score-value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
}

.quiz-score-label {
  font-size: var(--text-sm);
  opacity: 0.9;
}

/* ============================================
   FLASHCARD UI - 3D Flip Animation
   ============================================ */
.flashcard-container {
  perspective: 1000px;
  padding: var(--space-4);
  display: flex;
  justify-content: center;
}

.flashcard {
  width: 100%;
  max-width: 320px;
  height: 200px;
  cursor: pointer;
  position: relative;
}

.flashcard-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s var(--ease-spring);
}

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

.flashcard-front,
.flashcard-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  border-radius: var(--radius-xl);
  backface-visibility: hidden;
  border: 2px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

.flashcard-front {
  background: linear-gradient(135deg, var(--surface) 0%, var(--background-subtle) 100%);
}

.flashcard-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  border-color: transparent;
}

.flashcard-label {
  position: absolute;
  top: var(--space-2);
  left: var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.6;
}

.flashcard-front p,
.flashcard-back p {
  font-size: var(--text-base);
  text-align: center;
  line-height: 1.6;
  margin: 0;
}

.flashcard-hint {
  position: absolute;
  bottom: var(--space-2);
  font-size: var(--text-xs);
  color: var(--foreground-muted);
  opacity: 0.6;
}

.flashcard-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  background: var(--background-subtle);
}

.flashcard-progress {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--foreground-muted);
}

.flashcard-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Flashcard swipe animation */
.flashcard.swiping-left {
  animation: swipeLeft 0.3s var(--ease-out) forwards;
}

.flashcard.swiping-right {
  animation: swipeRight 0.3s var(--ease-out) forwards;
}

@keyframes swipeLeft {
  to {
    transform: translateX(-100%) rotate(-10deg);
    opacity: 0;
  }
}

@keyframes swipeRight {
  to {
    transform: translateX(100%) rotate(10deg);
    opacity: 0;
  }
}

/* ============================================
   SHARE PANEL
   ============================================ */
.share-options {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.share-option-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-out);
}

.share-option-card:hover {
  border-color: var(--primary);
  background: var(--background-subtle);
}

.share-option-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--glow-primary);
  border-radius: var(--radius-md);
  color: var(--primary);
  flex-shrink: 0;
}

.share-option-icon svg {
  width: 20px;
  height: 20px;
}

.share-option-content {
  flex: 1;
  min-width: 0;
}

.share-option-content h5 {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin: 0 0 var(--space-0_5) 0;
}

.share-option-content p {
  font-size: var(--text-xs);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================
   NOTES PANEL
   ============================================ */
.notes-editor {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.notes-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-1);
  color: var(--foreground);
}

.notes-timestamp-selector {
  display: flex;
  flex-direction: column;
}

.notes-timestamp-input {
  display: flex;
  gap: var(--space-2);
}

.notes-timestamp-input .input {
  flex: 1;
  font-family: var(--font-mono);
}

.notes-textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-sans);
  line-height: 1.6;
}

.notes-tags {
  display: flex;
  flex-direction: column;
}

.notes-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.notes-tag {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  background: var(--background-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.notes-tag:hover {
  border-color: var(--primary);
  background: var(--glow-primary);
}

.notes-tag.selected {
  background: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}

.notes-list {
  max-height: 300px;
  overflow-y: auto;
  padding: 0 var(--space-4) var(--space-4);
}

.note-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.note-item:hover {
  border-color: var(--primary);
}

.note-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.note-item-timestamp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--primary);
}

.note-item-tags {
  display: flex;
  gap: var(--space-1);
}

.note-item-tag {
  font-size: 10px;
  padding: 2px 6px;
  background: var(--background-subtle);
  border-radius: var(--radius-sm);
  color: var(--foreground-muted);
}

.note-item-content {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--foreground);
}

.note-item-delete {
  align-self: flex-end;
  font-size: var(--text-xs);
  color: var(--foreground-muted);
  background: transparent;
  border: none;
  padding: var(--space-1);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--duration-fast) ease;
}

.note-item:hover .note-item-delete {
  opacity: 1;
}

.note-item-delete:hover {
  color: var(--error);
}

/* ============================================
   RESPONSIVE STUDY TOOLS
   ============================================ */
@media (max-width: 480px) {
  .study-tools-grid {
    grid-template-columns: 1fr;
  }

  .flashcard {
    height: 180px;
  }
}

/* ============================================
   COGNITIVE PSYCHOLOGY ENHANCEMENTS
   ============================================ */

/* Attention Indicator - Von Restorff Effect: Unique element stands out */
.attention-indicator {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  animation: attentionPulse 2s ease-in-out infinite;
  box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.4);
}

@keyframes attentionPulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.4);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 0 0 8px rgba(6, 182, 212, 0);
  }
}

/* CTA Breathing - Draws eye without being annoying */
.btn-cta-breathe {
  animation: ctaBreathe 3s ease-in-out infinite;
}

@keyframes ctaBreathe {
  0%, 100% {
    box-shadow: var(--shadow-md);
    transform: translateY(0);
  }
  50% {
    box-shadow: var(--shadow-lg), 0 8px 25px -8px rgba(6, 182, 212, 0.3);
    transform: translateY(-2px);
  }
}

/* Floating Action Hint - Fitts's Law: Large targets are easier to hit */
.floating-hint {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  padding: var(--space-3) var(--space-5);
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  box-shadow: var(--shadow-lg);
  animation: floatHint 3s ease-in-out infinite;
  z-index: var(--z-popover);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring);
}

.floating-hint:hover {
  transform: scale(1.05);
}

@keyframes floatHint {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Progress Shimmer - Movement draws attention to progress */
.progress-shimmer::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 100%
  );
  animation: shimmerSlide 1.5s ease-in-out infinite;
}

@keyframes shimmerSlide {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Subtle Background Float - Ambient movement creates life */
.ambient-float {
  animation: ambientFloat 8s ease-in-out infinite;
}

@keyframes ambientFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2px, -3px) rotate(0.5deg); }
  50% { transform: translate(-1px, -5px) rotate(-0.5deg); }
  75% { transform: translate(-3px, -2px) rotate(0.25deg); }
}

/* Tab indicator animation - shows current focus */
.tabs-indicator-animated {
  position: absolute;
  bottom: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: all var(--duration-normal) var(--spring-smooth);
}

/* Gradient border animation for premium cards */
.gradient-border-animated {
  position: relative;
  background: var(--surface);
}

.gradient-border-animated::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(
    var(--gradient-angle, 0deg),
    var(--primary),
    var(--accent),
    var(--primary)
  );
  z-index: -1;
  animation: gradientRotate 4s linear infinite;
}

@keyframes gradientRotate {
  0% { --gradient-angle: 0deg; }
  100% { --gradient-angle: 360deg; }
}

/* Study Tool Focus Glow - Cognitive: Visual feedback for interaction */
.study-tool-card:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 2px var(--surface),
    0 0 0 4px var(--primary),
    0 8px 25px -8px rgba(6, 182, 212, 0.4);
}

/* Reduced motion: Disable all ambient animations */
@media (prefers-reduced-motion: reduce) {
  .attention-indicator,
  .btn-cta-breathe,
  .floating-hint,
  .ambient-float,
  .gradient-border-animated::before {
    animation: none !important;
  }

  .study-tool-card {
    animation: none;
  }

  .study-tool-icon {
    animation: none;
  }
}

/* ============================================
   DEMO MODE BANNER
   Shows when running in cloud demo mode
   ============================================ */
.demo-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-toast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  font-size: var(--text-sm);
  transform: translateY(-100%);
  transition: transform var(--duration-normal) var(--ease-out);
}

.demo-banner.visible {
  transform: translateY(0);
}

.demo-banner-icon {
  font-size: var(--text-lg);
}

.demo-banner-text {
  flex: 1;
  text-align: center;
}

.demo-banner-text a {
  color: white;
  text-decoration: underline;
  font-weight: var(--font-semibold);
}

.demo-banner-text a:hover {
  text-decoration: none;
}

.demo-banner-close {
  background: none;
  border: none;
  color: white;
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  opacity: 0.8;
  transition: opacity var(--duration-fast);
}

.demo-banner-close:hover {
  opacity: 1;
}

/* Adjust body padding when banner is visible */
body:has(.demo-banner.visible) {
  padding-top: 48px;
}

body:has(.demo-banner.visible) .header {
  top: 48px;
}

/* Playground mode banner (no backend detected) */
.playground-mode-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--warning-bg, rgba(245, 158, 11, 0.1));
  border: 1px solid var(--warning, #f59e0b);
  border-radius: var(--radius-lg, 8px);
  margin: var(--space-4) auto;
  max-width: 600px;
  font-size: var(--text-sm);
  color: var(--foreground);
}

.playground-mode-banner a {
  color: var(--primary);
  font-weight: var(--font-semibold);
  text-decoration: underline;
}

.playground-mode-banner a:hover {
  text-decoration: none;
}