* {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  touch-action: manipulation;
  box-sizing: border-box;
}

body {
  font-family: "DM Sans";
  margin: 0px;
  overflow-x: hidden;
  max-width: 100%;
}

h1 {
  font-family: 'Oswald';
  text-transform: uppercase;
  font-weight: bold;
  line-height: 100px;
  font-size: 100px;
  margin: 0px;
}

h3 {
  font-family: "DM Sans";
  font-weight: 300;
}

.hidden {
  display: none !important;
}

/* =============================================================================
   Tab Bar
   ============================================================================= */

.tab-bar {
  background: linear-gradient(to right, #fff 50%, #000 50%);
  position: sticky;
  top: 0;
  z-index: 100;
}

.tab-bar-inner {
  display: flex;
  width: 50%;
  padding: 0 20px;
  border-bottom: 1px solid #e0e0e0;
}

.tab-bar button {
  font-family: 'Oswald';
  text-transform: uppercase;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 14px 20px;
  color: #999;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.tab-bar button:hover {
  color: #000;
  background: none;
}

.tab-bar button.active {
  color: #000;
  border-bottom-color: #000;
}

.tab-bar button:disabled {
  color: #ccc;
  cursor: not-allowed;
}

.tab-bar button:disabled:hover {
  color: #ccc;
  background: none;
}

/* =============================================================================
   Custom Audio Player
   ============================================================================= */

.player {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.player-btn {
  width: 40px;
  height: 40px;
  min-width: 40px;
  padding: 0;
  border: 1px solid #000;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.player-btn:hover {
  background: #000;
}

.player-btn:hover .player-icon {
  fill: #fff;
}

.player-icon {
  width: 16px;
  height: 16px;
  fill: #000;
  transition: fill 0.2s;
}

.play-icon {
  margin-left: 2px;
}

.player-time,
.player-duration {
  font-family: 'Oswald';
  font-size: 13px;
  color: #888;
  min-width: 32px;
  letter-spacing: 0.5px;
}


.player-track {
  width: 100%;
  height: 4px;
  background: #e0e0e0;
  border-radius: 2px;
  position: relative;
  cursor: pointer;
}

.player-fill {
  height: 100%;
  background: #000;
  border-radius: 2px;
  width: 0%;
  pointer-events: none;
}

.player-track:hover {
  height: 6px;
}

/* Track wrapper (holds bar + marker) */
.player-track-wrapper {
  flex: 1;
  position: relative;
}

/* Start marker triangle */
.player-start-marker {
  position: absolute;
  top: 10px;
  left: 0%;
  transform: translateX(-50%);
  cursor: grab;
  padding: 4px 8px;
  z-index: 10;
  user-select: none;
}

.player-start-marker:active {
  cursor: grabbing;
}

.marker-arrow {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 8px solid #000;
}

/* Three-dot menu */
.player-menu-wrapper {
  position: relative;
  padding: 8px;
  margin: -8px;
}

.player-menu-btn {
  width: 40px;
  height: 40px;
  min-width: 40px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  font-size: 22px;
  letter-spacing: 3px;
  color: #888;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.2s;
}

.player-menu-btn:hover {
  color: #000;
  background: #f0f0f0;
}

.player-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 2px;
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  min-width: 140px;
  z-index: 200;
  overflow: hidden;
}

.player-menu-wrapper:hover .player-menu {
  display: block;
}

.player-menu-item {
  font-family: 'DM Sans';
  font-size: 13px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background-color 0.15s;
  text-transform: none;
  color: #555;
}

.player-menu-item:hover {
  background: #f5f5f5;
}

.player-menu-item.active {
  color: #000;
  font-weight: 500;
}

.player-menu-item.active::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background: #000;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

/* =============================================================================
   Page containers
   ============================================================================= */

.page {
  min-height: calc(100vh - 50px);
}

/* =============================================================================
   Freeplay Page (original styles)
   ============================================================================= */

.row {
  display: flex;
}

.column {
  flex: 50%;
}

.song_list {
  background-color: black;
  color: white;
  padding: 20px 50px 50px;
  min-height: 100vh;
  line-height: 30px;
}

.info_box {
  padding: 50px;
  padding-right: 100px;
}


button {
  text-transform: uppercase;
  font-weight: 500;
  color: #000000;
  background-color: #ffffff;
  font-size: 16px;
  border: 1px solid #000000;
  border-radius: 50px;
  padding: 15px 30px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  outline: none;
}

button:hover {
  color: #ffffff;
  background-color: #000000;
}

button:active {
  transform: scale(0.98);
}


/* =============================================================================
   Learn Page
   ============================================================================= */

.learn-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Navigation arrows + counter */
.learn-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.learn-arrow {
  width: 44px;
  height: 44px;
  padding: 0;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.learn-counter {
  font-family: 'Oswald';
  font-size: 20px;
  letter-spacing: 2px;
  color: #555;
}

/* Song metadata */
.learn-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.learn-title {
  font-family: 'Oswald';
  text-transform: uppercase;
  font-size: 36px;
  font-weight: 600;
  margin: 0;
}

.learn-composer {
  font-size: 18px;
  color: #333;
  margin: 0;
}

.learn-type {
  font-size: 14px;
  color: #888;
  text-transform: lowercase;
  font-style: italic;
}

/* Notes */
.learn-notes-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.learn-notes-label {
  font-family: 'Oswald';
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #666;
}

.learn-notes {
  font-family: 'DM Sans';
  font-size: 15px;
  line-height: 1.6;
  padding: 14px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #f8f8f8;
  resize: vertical;
  min-height: 100px;
  transition: border-color 0.2s;
}

.learn-notes:focus {
  outline: none;
  border-color: #000;
  background: #fff;
}


/* Interactive song list */
.interactive-song-list {
  display: flex;
  flex-direction: column;
}

.song-list-item {
  padding: 8px 16px;
  font-size: 16px;
  line-height: 1.5;
  cursor: pointer;
  transition: background-color 0.15s;
  border-left: 3px solid transparent;
}

.song-list-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.song-list-item.current {
  background: rgba(255, 255, 255, 0.15);
  border-left-color: #fff;
  font-weight: 500;
}


/* =============================================================================
   Quiz Page
   ============================================================================= */

.quiz-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-heading {
  font-family: 'Oswald';
  text-transform: uppercase;
  font-size: 36px;
  font-weight: 600;
  margin: 0;
}

.quiz-desc {
  font-size: 16px;
  color: #555;
  margin: 8px 0 24px;
}

.quiz-start-btn {
  font-family: 'Oswald';
  font-size: 16px;
  letter-spacing: 1px;
}

.quiz-card {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* Progress */
.quiz-progress {
  display: flex;
  align-items: center;
  gap: 16px;
}

#quiz-remaining {
  font-family: 'Oswald';
  font-size: 16px;
  letter-spacing: 1px;
  color: #555;
  white-space: nowrap;
}

.quiz-progress-bar {
  flex: 1;
  height: 4px;
  background: #e0e0e0;
  border-radius: 2px;
}

.quiz-progress-fill {
  height: 100%;
  background: #000;
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-reset-link {
  white-space: nowrap;
  font-family: 'DM Sans';
  font-size: 13px;
  font-weight: 400;
  text-transform: none;
  color: #999;
  background: none;
  border: none;
  padding: 4px 8px;
  cursor: pointer;
}

.quiz-reset-link:hover {
  color: #000;
  background: none;
}

.quiz-reset-link.confirming {
  color: #c00;
}

.quiz-reset-link.confirming:hover {
  color: #c00;
}

/* Ask buttons */
.quiz-ask {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-ask-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.quiz-notes-btn,
.quiz-reveal-btn {
  flex: 1;
  font-family: 'Oswald';
  font-size: 16px;
  letter-spacing: 1px;
  padding: 16px 24px;
}

.quiz-notes-btn {
  border-style: dashed;
}

/* Answer section */
.quiz-answer {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.quiz-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Notes display (read-only) */
.quiz-notes-display {
  border-left: 3px solid #ddd;
  padding: 12px 16px;
  background: #f8f8f8;
  border-radius: 0 8px 8px 0;
}

.quiz-notes-text {
  font-size: 15px;
  color: #555;
  line-height: 1.6;
  margin: 0;
  font-style: italic;
}

/* Assessment buttons */
.quiz-buttons {
  display: flex;
  gap: 16px;
}

.quiz-btn {
  flex: 1;
  font-family: 'Oswald';
  font-size: 16px;
  letter-spacing: 1px;
  padding: 16px 24px;
}

.quiz-btn-right {
  background: #000;
  color: #fff;
  border-color: #000;
}

.quiz-btn-right:hover {
  background: #333;
  color: #fff;
}

/* Confusion picker */
.quiz-confusion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-confusion-label {
  font-family: 'Oswald';
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #666;
  margin: 0;
}

.confusion-arrow::after {
  content: '\2192';
}

.quiz-confusion-skip {
  font-family: 'DM Sans';
  font-size: 13px;
  font-weight: 400;
  text-transform: none;
  color: #999;
  background: none;
  border: none;
  padding: 4px 0;
  cursor: pointer;
  align-self: flex-start;
}

.quiz-confusion-skip:hover {
  color: #000;
  background: none;
}

/* Quiz done */
.quiz-done {
  text-align: center;
  padding: 40px 0;
}

/* Quiz song list states */
.song-list-item.selected {
  outline: 1px solid rgba(255, 255, 255, 0.5);
  outline-offset: -1px;
  background: rgba(255, 255, 255, 0.08);
}

.song-list-item.deselected {
  opacity: 1;
}

.song-list-item.confusion-pick {
  cursor: pointer;
}

.song-list-item.confusion-pick:hover {
  background: rgba(255, 255, 255, 0.2);
  outline: 1px solid rgba(255, 255, 255, 0.4);
  outline-offset: -1px;
}

.song-list-item.done {
  opacity: 0.4;
}

.song-list-item.done::before {
  content: '\2713  ';
}

/* =============================================================================
   Compare Page
   ============================================================================= */

.compare-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.compare-empty {
  padding: 20px 0;
}

.compare-pairs-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.compare-pairs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.compare-pair-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
  font-family: 'DM Sans';
  font-size: 17px;
  text-transform: none;
  font-weight: 400;
  color: #333;
  background: #fff;
  text-align: left;
}

.compare-pair-item:hover {
  border-color: #000;
  background: #f5f5f5;
  color: #000;
}

.compare-pair-count {
  font-family: 'Oswald';
  font-size: 14px;
  color: #999;
  min-width: 24px;
  text-align: center;
}

.compare-pair-vs {
  color: #999;
  margin: 0 4px;
}

.compare-card {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.compare-phase {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.compare-instruction {
  font-family: 'Oswald';
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #333;
  margin: 0;
}

.compare-pair {
  display: flex;
  gap: 20px;
}

.compare-piece {
  flex: 1;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.compare-label {
  font-family: 'Oswald';
  font-size: 28px;
  font-weight: 600;
  color: #000;
}

.compare-piece-title {
  font-family: 'Oswald';
  font-size: 16px;
  font-weight: 600;
  text-transform: uppercase;
  margin: 0;
}

.compare-piece-composer {
  font-size: 14px;
  color: #666;
  margin: 0;
}

.compare-play-btn {
  width: 44px;
  height: 44px;
  min-width: 44px;
  padding: 0;
  border: 1px solid #000;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-top: 8px;
}

.compare-play-btn:hover {
  background: #000;
}

.compare-play-btn:hover .player-icon {
  fill: #fff;
}

.compare-play-btn .player-icon {
  margin-left: 2px;
}

.compare-result-text {
  font-family: 'Oswald';
  font-size: 28px;
  font-weight: 600;
  text-transform: uppercase;
  margin: 0;
}

.compare-result-answer {
  font-size: 16px;
  color: #555;
  margin: 0;
}

/* =============================================================================
   Mobile Responsive
   ============================================================================= */

@media only screen and (max-width: 900px) {
  html, body {
    width: 100%;
    overflow-x: hidden;
  }

  h1 {
    font-size: 50px;
    line-height: 60px;
  }

  h3 {
    font-size: 20px;
  }

  .info_box, .song_list {
    padding: 25px;
    max-width: 100%;
  }

  .info_box {
    padding-right: 25px;
  }

  .song_list p {
    white-space: normal;
    word-wrap: break-word;
    hyphens: auto;
  }

  .row {
    display: flex;
    flex-direction: column;
  }

  .column {
    width: 100%;
    display: block;
  }

  .info_box {
    order: 1;
  }

  .song_list {
    order: 2;
    min-height: auto;
  }

  /* Tab bar equal width on mobile */
  .tab-bar {
    background: #fff;
  }

  .tab-bar-inner {
    width: 100%;
    padding: 0;
  }

  .tab-bar button {
    flex: 1;
    font-size: 13px;
    padding: 12px 14px;
    white-space: nowrap;
    text-align: center;
  }

  /* Learn page mobile */
  .learn-title {
    font-size: 26px;
  }

  .learn-nav {
    margin-top: 8px;
  }

  .confusion-arrow::after {
    content: '\2193';
  }

  .learn-main {
    gap: 24px;
  }


  .quiz-buttons {
    flex-direction: column;
  }

  .compare-pair {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  button {
    width: auto;
    min-height: 44px;
  }
}