/* Piano Lab Studio — split video + visual guide */

/* ── Custom scrollbars (sidebar + guide + video panel) ── */
.pl-studio-sidebar,
.pl-guide-viewport,
.pl-panel-video {
  --pl-scroll-size: 7px;
  --pl-scroll-track: rgba(255, 255, 255, 0.04);
  --pl-scroll-thumb: rgba(255, 255, 255, 0.18);
  --pl-scroll-thumb-hover: rgba(140, 207, 16, 0.55);
  --pl-scroll-thumb-active: rgba(140, 207, 16, 0.78);
  scrollbar-width: thin;
  scrollbar-color: var(--pl-scroll-thumb) transparent;
}

.pl-studio-sidebar::-webkit-scrollbar,
.pl-guide-viewport::-webkit-scrollbar,
.pl-panel-video::-webkit-scrollbar {
  width: var(--pl-scroll-size);
  height: var(--pl-scroll-size);
}

.pl-studio-sidebar::-webkit-scrollbar-track,
.pl-guide-viewport::-webkit-scrollbar-track,
.pl-panel-video::-webkit-scrollbar-track {
  background: transparent;
  margin: 6px 0;
}

.pl-studio-sidebar::-webkit-scrollbar-thumb,
.pl-guide-viewport::-webkit-scrollbar-thumb,
.pl-panel-video::-webkit-scrollbar-thumb {
  background: var(--pl-scroll-thumb);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background 0.2s ease;
}

.pl-studio-sidebar::-webkit-scrollbar-thumb:hover,
.pl-guide-viewport::-webkit-scrollbar-thumb:hover,
.pl-panel-video::-webkit-scrollbar-thumb:hover {
  background: var(--pl-scroll-thumb-hover);
  border: 2px solid transparent;
  background-clip: padding-box;
}

.pl-studio-sidebar::-webkit-scrollbar-thumb:active,
.pl-guide-viewport::-webkit-scrollbar-thumb:active,
.pl-panel-video::-webkit-scrollbar-thumb:active {
  background: var(--pl-scroll-thumb-active);
}

.pl-studio-sidebar::-webkit-scrollbar-corner,
.pl-guide-viewport::-webkit-scrollbar-corner,
.pl-panel-video::-webkit-scrollbar-corner {
  background: transparent;
}

.pl-studio-body { overflow: auto; }
.pl-studio-body .pl-bg { z-index: 0; }
.pl-studio-body .pl-top { position: relative; z-index: 2; }
.pl-studio-badge {
  font-style: normal;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--green);
  margin-left: 6px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(140, 207, 16, 0.35);
  background: rgba(140, 207, 16, 0.12);
  vertical-align: middle;
}

.pl-studio-top .pl-top-inner { max-width: none; padding: 12px 16px; }
.pl-studio-top-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 140px;
}
.pl-progress-track {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
  min-width: 80px;
}
.pl-progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green), rgba(140, 207, 16, 0.7));
  transition: width 0.35s ease;
}
.pl-progress-text {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted2);
  white-space: nowrap;
}

.pl-studio {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: calc(100vh - 52px);
  max-width: none;
  margin: 0;
  position: relative;
  z-index: 1;
}
@media (max-width: 960px) {
  .pl-studio { grid-template-columns: 1fr; height: auto; min-height: calc(100vh - 52px); }
  .pl-studio-sidebar { max-height: 220px; border-right: 0; border-bottom: 1px solid var(--border); }
}

.pl-studio-sidebar {
  padding-bottom: 12px;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
}
.pl-lesson-nav { padding-bottom: 20px; }

.pl-workspace {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.12);
}

.pl-lesson-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(33, 25, 30, 0.6);
  flex-shrink: 0;
}
.pl-lesson-bar-left { min-width: 0; }
.pl-lesson-kicker {
  display: block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 4px;
}
.pl-lesson-bar .pl-lesson-title {
  margin: 0;
  font-size: clamp(18px, 2.5vw, 22px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.pl-lesson-bar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.pl-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  cursor: pointer;
  transition: background 0.15s;
}
.pl-icon-btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.12); }
.pl-icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.pl-icon-btn-sm { width: 34px; height: 34px; border-radius: 10px; }

.pl-lesson-bar .pl-mark-done {
  padding: 10px 16px;
  white-space: nowrap;
}
.pl-mark-done.is-done {
  border-color: rgba(140, 207, 16, 0.4);
  background: rgba(140, 207, 16, 0.15);
  color: var(--green);
}

.pl-mobile-tabs {
  display: none;
  padding: 8px 16px 0;
  gap: 8px;
}
@media (max-width: 960px) {
  .pl-mobile-tabs { display: flex; }
  .pl-split { flex-direction: column; }
  .pl-panel:not(.is-visible) { display: none; }
}

.pl-mobile-tab {
  flex: 1;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.pl-mobile-tab.is-active {
  background: rgba(140, 207, 16, 0.14);
  border-color: rgba(140, 207, 16, 0.35);
  color: #fff;
}

.pl-split {
  flex: 1;
  display: grid;
  grid-template-columns: var(--split-cols, 1fr 5px 1fr);
  gap: 0;
  min-height: 0;
  overflow: hidden;
}
@media (max-width: 960px) {
  .pl-split {
    display: block;
    overflow: visible;
    min-height: 0;
  }
  .pl-split-handle { display: none; }
}

.pl-split-handle {
  cursor: col-resize;
  background: rgba(255, 255, 255, 0.06);
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 2;
  transition: background 0.15s;
}
.pl-split-handle::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 40px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
}
.pl-split-handle:hover,
.pl-split-handle:focus-visible {
  background: rgba(140, 207, 16, 0.12);
  outline: none;
}
body.pl-split-dragging {
  cursor: col-resize;
  user-select: none;
}
body.pl-split-dragging .pl-split-handle {
  background: rgba(140, 207, 16, 0.2);
}

.pl-panel {
  display: flex;
  flex-direction: column;
  min-height: 320px;
  min-width: 0;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.15);
}
.pl-panel-video {
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
}

.pl-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.2);
  flex-shrink: 0;
}
.pl-panel-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted2);
}

.pl-panel-video .pl-video-wrap {
  position: relative;
  margin: 0;
  border-radius: 0;
  border: 0;
  flex: 1 1 auto;
  width: 100%;
  min-height: 200px;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}
.pl-panel-video video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}
.pl-panel-video .pl-lesson-desc {
  padding: 12px 16px 0;
  margin: 0;
  font-size: 14px;
}
.pl-panel-video .pl-progression {
  margin: 10px 16px 16px;
}
.pl-panel-video .pl-progression[hidden] {
  display: none !important;
}

.pl-intro-panel {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(600px 400px at 50% 30%, rgba(255, 0, 137, 0.12), transparent 60%),
    radial-gradient(500px 350px at 80% 70%, rgba(140, 207, 16, 0.1), transparent 55%),
    #0d0a0c;
}
.pl-intro-panel[hidden] { display: none !important; }
.pl-intro-panel-inner {
  max-width: 360px;
  text-align: center;
}
.pl-intro-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin: 0 auto 14px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--green);
  background: rgba(140, 207, 16, 0.12);
  border: 1px solid rgba(140, 207, 16, 0.35);
}
.pl-intro-panel h3 {
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.3px;
}
.pl-intro-panel p {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.55;
}
.pl-intro-panel p strong { color: var(--green); }
.pl-intro-hint {
  font-size: 13px !important;
  color: var(--muted2) !important;
  margin-top: 14px !important;
}
.pl-jazzmap-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 18px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #0d0a0c;
  text-decoration: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--green), #a8e020);
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.pl-jazzmap-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(140, 207, 16, 0.35);
}
.pl-split.is-jazzmap-mode .pl-panel-guide { display: none !important; }
.pl-split.is-jazzmap-mode .pl-split-handle { display: none !important; }
.pl-split.is-jazzmap-mode { --split-cols: 1fr !important; }
.pl-lesson-btn.is-intro .pl-lesson-num,
.pl-lesson-btn.is-reference .pl-lesson-num,
.pl-lesson-btn.is-jazzmap .pl-lesson-num,
.pl-lesson-btn.is-251 .pl-lesson-num {
  font-size: 9px;
  letter-spacing: 0.04em;
  padding: 0 4px;
}
.pl-panel-video.is-intro-mode video { visibility: hidden; }

.pl-guide-head {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 0;
}
.pl-guide-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(140, 207, 16, 0.04);
}
.pl-guide-head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  width: 100%;
  padding: 8px 16px 10px;
}
.pl-guide-lang-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
.pl-guide-lang-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  white-space: nowrap;
}
.pl-guide-lang {
  display: inline-flex;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid rgba(140, 207, 16, 0.35);
  background: rgba(0, 0, 0, 0.35);
  gap: 3px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.pl-guide-lang-btn {
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.55);
  font: inherit;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}
.pl-guide-lang-btn:hover:not(.is-active) {
  color: rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.08);
}
.pl-guide-lang-btn.is-active {
  background: linear-gradient(135deg, #8ccf10, #b5e632);
  color: #141010;
  box-shadow: 0 2px 12px rgba(140, 207, 16, 0.45);
}
.pl-guide-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.pl-guide-tab {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.pl-guide-tab.is-active {
  background: rgba(255, 0, 137, 0.16);
  border-color: rgba(255, 0, 137, 0.35);
  color: #fff;
}
.pl-guide-tab[hidden] { display: none; }

.pl-guide-pager {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.pl-guide-page {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  min-width: 72px;
  text-align: center;
}

.pl-guide-viewport {
  flex: 1;
  overflow: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12px;
  min-height: 320px;
  position: relative;
}
.pl-guide-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--muted2);
  font-size: 14px;
  text-align: center;
}
.pl-guide-loading[hidden] { display: none !important; }
.pl-guide-spread {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
}
.pl-guide-spread[hidden] { display: none !important; }
.pl-guide-page-canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  background: #fff;
}
.pl-guide-spread-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted2);
  align-self: flex-start;
  margin-left: 4px;
}
.pl-guide-iframe {
  position: absolute;
  inset: 12px;
  width: calc(100% - 24px);
  min-height: 360px;
  border: 0;
  border-radius: 8px;
  background: #fff;
}
.pl-guide-iframe[hidden] { display: none !important; }
.pl-guide-sync-hint {
  margin: 0;
  padding: 10px 16px 14px;
  font-size: 12px;
  color: var(--muted2);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-shrink: 0;
}

/* Override legacy course styles from pianolab-pages.css */
.pl-studio .pl-video-wrap {
  margin-bottom: 0;
  border-radius: 0;
}
body.pl-shell-locked .pl-studio { filter: blur(6px); pointer-events: none; user-select: none; }