.byl-app {
  --byl-bg: #f6f7fb;
  --byl-card: #ffffff;
  --byl-text: #172033;
  --byl-muted: #667085;
  --byl-border: #e4e7ec;
  --byl-accent: #5b5bd6;
  --byl-accent-soft: #eeeeff;
  --byl-success: #067647;
  --byl-danger: #b42318;
  --byl-surface-raised: #ffffff;
  --byl-control-bg: #ffffff;
  --byl-control-hover: #fafaff;
  --byl-divider: #edf0f4;
  --byl-success-bg: #f6fef9;
  --byl-error-bg: #fff6f5;
  --byl-pronunciation-bg: #fafbff;
  --byl-progress-track: #eef2f6;
  color: var(--byl-text);
  background: var(--byl-bg);
  border: 1px solid var(--byl-border);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(16, 24, 40, .08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.byl-app *, .byl-app *::before, .byl-app *::after { box-sizing: border-box; }
.byl-app button, .byl-app input, .byl-app select { font: inherit; }
.byl-app button { cursor: pointer; }
.byl-app [hidden] { display: none !important; }

.byl-topbar {
  display: flex;
  gap: 24px;
  justify-content: space-between;
  align-items: center;
  padding: 22px 24px;
  background: var(--byl-card);
  border-bottom: 1px solid var(--byl-border);
}

.byl-brand h2 { margin: 2px 0 0; font-size: clamp(20px, 2vw, 28px); line-height: 1.2; }
.byl-kicker { color: var(--byl-accent); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }

.byl-btn {
  border: 0;
  border-radius: 11px;
  padding: 10px 14px;
  font-weight: 750;
  line-height: 1.2;
  transition: transform .15s ease, opacity .15s ease, background .15s ease;
}
.byl-btn:hover:not(:disabled) { transform: translateY(-1px); }
.byl-btn:disabled { opacity: .45; cursor: not-allowed; }
.byl-btn-primary { background: var(--byl-accent); color: #fff; }
.byl-btn-soft { background: var(--byl-control-bg); border: 1px solid var(--byl-border); color: var(--byl-text); }

.byl-library { padding: 14px 24px 16px; background: var(--byl-card); border-bottom: 1px solid var(--byl-border); }
.byl-section-title { font-size: 12px; font-weight: 800; color: var(--byl-muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 10px; }
.byl-library-list { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 2px; }
.byl-library-card {
  flex: 0 0 180px;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--byl-border);
  border-radius: 12px;
  background: var(--byl-card);
  text-align: left;
  color: var(--byl-text);
}
.byl-library-card img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #e9ebf1; }
.byl-library-thumb-fallback { display: grid !important; place-items: center; width: 100%; aspect-ratio: 16 / 9; padding: 0 !important; background: #00aeec; color: #fff; font-weight: 850; letter-spacing: .03em; }
.byl-library-card span { display: block; padding: 9px 10px 10px; font-weight: 700; font-size: 13px; line-height: 1.3; }

.byl-workspace { --byl-player-percent: 40%; display: grid; grid-template-columns: minmax(330px, var(--byl-player-percent)) 12px minmax(0, 1fr); min-height: 640px; }
.byl-left-pane { min-width:0; padding: 20px; }
.byl-workspace-splitter { position:relative; min-width:12px; cursor:col-resize; touch-action:none; outline:none; background:transparent; }
.byl-workspace-splitter-line { position:absolute; top:0; bottom:0; left:50%; width:1px; transform:translateX(-50%); background:var(--byl-border); transition:width .14s ease, background .14s ease, box-shadow .14s ease; }
.byl-workspace-splitter-handle { position:absolute; z-index:4; top:50%; left:50%; width:18px; height:34px; transform:translate(-50%,-50%); border:1px solid var(--byl-border); border-radius:999px; background:var(--byl-surface-raised); box-shadow:0 8px 22px rgba(10,15,30,.12); opacity:.72; transition:opacity .14s ease, transform .14s ease, border-color .14s ease, background .14s ease, box-shadow .14s ease; }
.byl-workspace-splitter-handle::before { content:""; position:absolute; inset:0; background:radial-gradient(circle, currentColor 1.15px, transparent 1.35px) center / 4px 8px repeat-y; color:var(--byl-muted); opacity:.9; }
.byl-workspace-splitter:hover .byl-workspace-splitter-line, .byl-workspace-splitter:focus-visible .byl-workspace-splitter-line, .byl-workspace.is-resizing .byl-workspace-splitter-line { width:2px; background:var(--byl-accent); box-shadow:0 0 0 3px var(--byl-accent-soft); }
.byl-workspace-splitter:hover .byl-workspace-splitter-handle, .byl-workspace-splitter:focus-visible .byl-workspace-splitter-handle, .byl-workspace.is-resizing .byl-workspace-splitter-handle { opacity:1; transform:translate(-50%,-50%) scale(1.04); border-color:var(--byl-accent); background:var(--byl-surface-raised); box-shadow:0 0 0 4px var(--byl-accent-soft),0 10px 24px rgba(10,15,30,.16); }
.byl-workspace.is-resizing, .byl-workspace.is-resizing * { cursor:col-resize !important; user-select:none !important; }
.byl-current-video-title-wrap { margin: 0 0 12px; padding: 0 2px; }
.byl-current-video-title { margin: 0; color: var(--byl-text); font-size: clamp(18px, 1.35vw, 24px); line-height: 1.3; font-weight: 750; letter-spacing: -.02em; text-wrap: balance; }
.byl-right-pane { min-width: 0; background: var(--byl-card); display: flex; flex-direction: column; }

.byl-player-stage {
  position: relative;
  width: 100%;
}

.byl-player-shell {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #101828;
  border-radius: 16px;
  overflow: hidden;
}
.byl-player-target, .byl-player-target > [data-player], .byl-player-target iframe { width: 100% !important; height: 100% !important; display: block; }
.byl-player-placeholder {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  color: #fff;
  text-align: center;
  padding: 24px;
  background: radial-gradient(circle at top, #344054 0, #101828 60%);
}
.byl-player-placeholder span { color: #d0d5dd; font-size: 13px; }
.byl-play-icon { width: 54px; height: 54px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.14); margin-bottom: 4px; }

.byl-player-shell.byl-bilibili-controlled .byl-player-target iframe { pointer-events: none; }
.byl-bilibili-play-surface {
  position: absolute; inset: 0; z-index: 3; border: 0; padding: 0; margin: 0;
  display: grid; place-items: center; background: transparent; color: #fff; cursor: pointer;
}
.byl-bilibili-play-surface[hidden] { display: none !important; }
.byl-bilibili-play-surface-icon {
  width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center;
  background: rgba(16,24,40,.78); border: 1px solid rgba(255,255,255,.55);
  font-size: 25px; line-height: 1; box-shadow: 0 10px 30px rgba(0,0,0,.28);
  transition: opacity .15s ease, transform .15s ease;
}
.byl-player-shell.is-bilibili-playing .byl-bilibili-play-surface-icon { opacity: 0; transform: scale(.9); }
.byl-player-shell.is-bilibili-playing .byl-bilibili-play-surface:hover .byl-bilibili-play-surface-icon,
.byl-player-shell.is-bilibili-playing .byl-bilibili-play-surface:focus-visible .byl-bilibili-play-surface-icon { opacity: 1; }

.byl-pronunciation-pair { background: var(--byl-surface-raised); }

.byl-subtitle-panel.byl-subtitle-overlay {
  position: static;
  width: 100%;
  max-width: none;
  margin-top: 10px;
  transform: none;
  padding: 0;
  border: 1px solid var(--byl-border);
  border-radius: 16px;
  text-align: left;
  pointer-events: auto;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(16,24,40,.07);
  opacity: 1;
  transition: opacity .18s ease, background-color .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.byl-subtitle-overlay[hidden] { display: none !important; }
.byl-subtitle-overlay.is-bg-soft { background: var(--byl-surface-raised); }
.byl-subtitle-overlay.is-bg-strong { background: #111827; border-color: #273244; }
.byl-subtitle-overlay.is-position-overlay {
  position: absolute;
  left: 50%;
  bottom: clamp(58px, 11%, 86px);
  z-index: 5;
  width: min(90%, 900px);
  max-width: 90%;
  margin: 0;
  transform: translateX(-50%);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  pointer-events: none;
  box-shadow: 0 14px 38px rgba(0,0,0,.36);
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px) saturate(120%);
}
.byl-subtitle-overlay.is-position-overlay.is-overlay-placement-bottom { bottom: clamp(58px, 11%, 86px); }
.byl-subtitle-overlay.is-position-overlay.is-overlay-placement-above-controls { bottom: clamp(104px, 18%, 142px); }
.byl-subtitle-overlay.is-position-overlay.is-bg-soft { background: rgba(0,0,0,.62); border-color: rgba(255,255,255,.12); }
.byl-subtitle-overlay.is-position-overlay.is-bg-strong { background: rgba(0,0,0,.78); border-color: rgba(255,255,255,.16); }
.byl-subtitle-overlay.is-position-overlay .byl-overlay-source { color: #fff; text-shadow: 0 1px 3px rgba(0,0,0,.35); }
.byl-subtitle-overlay.is-position-overlay .byl-overlay-translation { color: rgba(255,255,255,.88); text-shadow: 0 1px 2px rgba(0,0,0,.28); }
.byl-subtitle-overlay.is-position-overlay .byl-pronunciation-pair { background: rgba(255,255,255,.10); border-color: rgba(255,255,255,.18); box-shadow: inset 0 1px 0 rgba(255,255,255,.04); }
.byl-subtitle-overlay.is-position-overlay .byl-pronunciation-phoneme { color: #f8fafc; }
.byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-label { display: none; }
.byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-section { padding: 7px 12px; }
.byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-section + .byl-subtitle-card-section { border-top-color: rgba(152,162,179,.22); }
.byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-language-one,
.byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-language-two { background: transparent; }
.byl-subtitle-overlay.is-position-overlay.is-waiting { opacity: 0; }
.byl-subtitle-card-section { padding: 12px 16px; transition: opacity .18s ease; }
.byl-subtitle-overlay.is-waiting .byl-subtitle-card-section { opacity: 0; }
.byl-subtitle-card-section + .byl-subtitle-card-section { border-top: 1px solid var(--byl-divider); }
.byl-subtitle-card-label,
.byl-learning-block-label {
  margin-bottom: 6px;
  color: #98a2b3;
  font-size: 10px;
  font-weight: 850;
  line-height: 1;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.byl-subtitle-card-language-one { background: var(--byl-surface-raised); }
.byl-subtitle-card-language-two { background: var(--byl-pronunciation-bg); }
.byl-overlay-source, .byl-overlay-phonetic, .byl-overlay-translation { min-width: 0; overflow-wrap: anywhere; text-shadow: none; }
.byl-overlay-source { color: var(--byl-text); font-weight: 900; line-height: 1.35; letter-spacing: .005em; text-align: center; }
.byl-overlay-phonetic { margin-top: 7px; justify-content: center; }
.byl-overlay-translation { margin-top: 0; color: var(--byl-muted); font-weight: 700; line-height: 1.45; text-align: center; }
.byl-subtitle-overlay.is-bg-strong .byl-subtitle-card-section + .byl-subtitle-card-section { border-top-color: #273244; }
.byl-subtitle-overlay.is-bg-strong .byl-subtitle-card-language-one,
.byl-subtitle-overlay.is-bg-strong .byl-subtitle-card-language-two { background: rgba(255,255,255,.04); }
.byl-subtitle-overlay.is-bg-strong .byl-subtitle-card-label { color: #98a2b3; }
.byl-subtitle-overlay.is-bg-strong .byl-overlay-source { color: #fff; }
.byl-subtitle-overlay.is-bg-strong .byl-overlay-translation { color: #fff; }
.byl-subtitle-overlay.is-bg-strong .byl-pronunciation-pair { background: rgba(255,255,255,.08); border-color: #475467; }
.byl-subtitle-overlay.is-bg-strong .byl-pronunciation-word { color: #d0d5dd; }
.byl-subtitle-overlay.is-bg-strong .byl-pronunciation-phoneme { color: #fff; }
.byl-subtitle-overlay.is-size-small .byl-overlay-source { font-size: clamp(17px, 1.9vw, 21px); }
.byl-subtitle-overlay.is-size-small .byl-pronunciation-word { font-size: 10px; }
.byl-subtitle-overlay.is-size-small .byl-pronunciation-phoneme { font-size: 12px; }
.byl-subtitle-overlay.is-size-small .byl-overlay-translation { font-size: clamp(13px, 1.45vw, 16px); }
.byl-subtitle-overlay.is-size-medium .byl-overlay-source { font-size: clamp(20px, 2.2vw, 26px); }
.byl-subtitle-overlay.is-size-medium .byl-pronunciation-word { font-size: 11px; }
.byl-subtitle-overlay.is-size-medium .byl-pronunciation-phoneme { font-size: 14px; }
.byl-subtitle-overlay.is-size-medium .byl-overlay-translation { font-size: clamp(14px, 1.7vw, 19px); }
.byl-subtitle-overlay.is-size-large .byl-overlay-source { font-size: clamp(23px, 2.8vw, 32px); }
.byl-subtitle-overlay.is-size-large .byl-pronunciation-word { font-size: 12px; }
.byl-subtitle-overlay.is-size-large .byl-pronunciation-phoneme { font-size: 16px; }
.byl-subtitle-overlay.is-size-large .byl-overlay-translation { font-size: clamp(16px, 2vw, 22px); }

.byl-subtitle-display-controls {
  margin-top: 10px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  border: 1px solid var(--byl-border);
  border-radius: 12px;
  background: var(--byl-surface-raised);
}
.byl-subtitle-display-title { font-size: 12px; font-weight: 850; color: var(--byl-text); white-space: nowrap; }
.byl-subtitle-toggle-group, .byl-subtitle-style-group { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.byl-subtitle-toggle-group label { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; color: var(--byl-muted); cursor: pointer; }
.byl-subtitle-toggle-group input { margin: 0; accent-color: var(--byl-accent); }
.byl-subtitle-style-group { margin-left: auto; }
.byl-subtitle-style-group label { display: inline-flex; align-items: center; gap: 5px; color: var(--byl-muted); font-size: 11px; font-weight: 700; }
.byl-subtitle-style-group select { border: 1px solid var(--byl-border); border-radius: 9px; background: var(--byl-control-bg); padding: 6px 8px; color: var(--byl-text); font-size: 12px; }
[data-overlay-placement-wrap][hidden], [data-mobile-overlay-placement-wrap][hidden] { display: none !important; }

.byl-player-tools { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.byl-track-wrap select, .byl-language-add select {
  border: 1px solid var(--byl-border);
  border-radius: 10px;
  background: var(--byl-control-bg);
  padding: 8px 10px;
  color: var(--byl-text);
}

.byl-fallback {
  margin-top: 14px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--byl-border);
  background: #fff;
}
.byl-fallback { border-color: #f9dbaf; background: #fffaeb; }
.byl-fallback p { margin: 5px 0 0; color: var(--byl-muted); font-size: 13px; line-height: 1.55; }
.byl-upload-row { display: flex; gap: 8px; align-items: center; margin-top: 12px; flex-wrap: wrap; }
.byl-upload-row input { min-width: 0; max-width: 100%; }

.byl-transcript-toolbar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: end;
  padding: 14px 18px 12px;
  border-bottom: 1px solid var(--byl-border);
}
.byl-track-wrap, .byl-language-add { min-width: 0; }
.byl-track-wrap label, .byl-language-add label { display: flex; min-width: 0; flex-direction: column; gap: 6px; color: var(--byl-muted); font-size: 11px; font-weight: 800; letter-spacing: .01em; }
.byl-language-add { display: block; margin-left: 0; }
.byl-track-wrap select, .byl-language-add select { width: 100%; min-width: 0; min-height: 44px; }

.byl-language-bar {
  display: flex;
  align-items: center;
  min-height: 52px;
  gap: 12px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--byl-border);
}
.byl-language-chips { display: flex; flex-wrap: wrap; gap: 7px; flex: 1; }
.byl-language-chip {
  border: 1px solid var(--byl-border);
  background: var(--byl-control-bg);
  color: var(--byl-muted);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 750;
}
.byl-language-chip.is-active { color: var(--byl-accent); border-color: #c7c7ff; background: var(--byl-accent-soft); }
.byl-toggle { display: flex; align-items: center; gap: 7px; color: var(--byl-muted); font-size: 12px; white-space: nowrap; }

.byl-status { padding: 9px 18px; background: var(--byl-pronunciation-bg); border-bottom: 1px solid var(--byl-border); color: var(--byl-muted); font-size: 12px; }
.byl-status[data-type="error"] { color: var(--byl-danger); background: var(--byl-error-bg); }
.byl-status[data-type="success"] { color: var(--byl-success); background: var(--byl-success-bg); }
.byl-status[data-type="loading"] { color: var(--byl-accent); }

.byl-transcript-head, .byl-transcript-row {
  display: flex;
  width: 100%;
  gap: 10px;
}
.byl-transcript-head {
  padding: 9px 18px;
  border-bottom: 1px solid var(--byl-border);
  color: var(--byl-muted);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.byl-transcript {
  max-height: 580px;
  overflow: auto;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
}
.byl-transcript-row {
  position: relative;
  padding: 13px 12px;
  border-bottom: 1px solid var(--byl-divider);
  transition: background .15s ease, box-shadow .15s ease;
  cursor: pointer;
}

.byl-transcript-spacer { width: 100%; min-height: 0; pointer-events: none; }
.byl-transcript-row.is-loading { min-height: 92px; cursor: default; opacity: .6; }
.byl-transcript-follow { position: sticky; top: 0; z-index: 4; display: flex; justify-content: center; padding: 7px 12px; border-bottom: 1px solid var(--byl-border); background: color-mix(in srgb, var(--byl-surface) 92%, transparent); backdrop-filter: blur(10px); }
.byl-transcript-follow[hidden] { display: none !important; }
.byl-return-current { border: 1px solid color-mix(in srgb, var(--byl-accent) 45%, var(--byl-border)); border-radius: 999px; background: var(--byl-accent-soft); color: var(--byl-text); padding: 7px 12px; font-size: 12px; font-weight: 800; cursor: pointer; }
.byl-return-current:hover { border-color: var(--byl-accent); transform: translateY(-1px); }

.byl-transcript-row:hover { background: var(--byl-control-hover); }
.byl-transcript-row.is-active { background: var(--byl-accent-soft); box-shadow: inset 3px 0 0 var(--byl-accent); }
.byl-time { flex: 0 0 54px; width: 54px; min-width: 54px; align-self: start; border: 0; background: transparent; color: var(--byl-muted); font-size: 12px; font-weight: 800; padding: 2px 0; text-align: left; }
.byl-app .byl-source-cell { width: 100%; max-width: none; min-width: 0; justify-self: stretch; }
.byl-app .byl-transcript-row > .byl-source-cell { flex: 1 1 0; width: auto !important; max-width: none !important; min-width: 0 !important; align-self: stretch; }
.byl-transcript-head > :first-child { flex: 0 0 54px; width: 54px; min-width: 54px; }
.byl-transcript-head > :nth-child(2),
.byl-transcript-head > :nth-child(3) { flex: 1 1 0; min-width: 0; }
.byl-language-cell { flex: 1 1 0; min-width: 0; align-self: stretch; }
.byl-language-two-cell { padding-left: 12px; border-left: 1px solid var(--byl-divider); }
.byl-language-text { min-width: 0; color: var(--byl-text); font-size: 15px; font-weight: 650; line-height: 1.55; overflow-wrap: anywhere; }
.byl-language-text.is-empty { color: #98a2b3; font-style: italic; font-weight: 600; }
.byl-source, .byl-translation { min-width: 0; line-height: 1.6; overflow-wrap: anywhere; }
.byl-source { width: 100%; color: var(--byl-text); font-size: 16px; font-weight: 700; line-height: 1.5; }
.byl-app .byl-learning-block { display: block; width: 100%; max-width: none; margin-top: 10px; padding: 10px 11px; border: 1px solid var(--byl-divider); border-radius: 11px; }
.byl-pronunciation-block { background: var(--byl-pronunciation-bg); }
.byl-translation-block { background: var(--byl-pronunciation-bg); }
.byl-phonetic { margin-top: 0; color: #667085; font-size: 13px; font-weight: 500; line-height: 1.5; }
.byl-pronunciation-pairs { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 6px 8px; }
.byl-pronunciation-pair { display: inline-flex; flex-direction: column; align-items: center; justify-content: flex-end; min-width: max-content; padding: 5px 8px 6px; border: 1px solid var(--byl-border); border-radius: 9px; background: var(--byl-surface-raised); line-height: 1.25; }
.byl-pronunciation-word { color: var(--byl-muted); font-size: 10px; font-weight: 750; line-height: 1.15; }
.byl-pronunciation-phoneme { color: var(--byl-text); font-size: 12px; font-weight: 600; white-space: nowrap; }
.byl-translation { margin-top: 0; color: var(--byl-muted); }
.byl-translation.is-empty { color: #98a2b3; font-style: italic; }
.byl-word {
  display: inline;
  border: 0;
  margin: 0;
  padding: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: inherit;
  border-bottom: 1px dotted transparent;
}
.byl-word:hover { color: var(--byl-accent); border-bottom-color: var(--byl-accent); }


.byl-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 99999;
  transform: translate(-50%, 14px);
  padding: 9px 13px;
  border-radius: 10px;
  background: #101828;
  color: #fff;
  box-shadow: 0 10px 25px rgba(16,24,40,.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  font-size: 13px;
}
.byl-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 980px) {
  .byl-topbar { align-items: stretch; flex-direction: column; }
  .byl-workspace { grid-template-columns: 1fr; }
  .byl-workspace-splitter { display:none; }
  .byl-left-pane { border-right: 0; border-bottom: 1px solid var(--byl-border); }
  .byl-transcript { max-height: 620px; }
}

@media (max-width: 640px) {
  .byl-app { border-radius: 14px; }
  .byl-topbar, .byl-left-pane { padding: 14px; }
  .byl-library { padding-left: 14px; padding-right: 14px; }
  .byl-transcript-toolbar { align-items: stretch; flex-direction: column; }
  .byl-language-add { width: 100%; margin-left: 0; align-items: stretch; }
  .byl-language-add label { flex: 1; }
  .byl-language-bar { align-items: flex-start; flex-direction: column; }
  .byl-transcript-head, .byl-transcript-row { gap: 8px; }
  .byl-time, .byl-transcript-head > :first-child { flex-basis: 44px; width: 44px; min-width: 44px; }
  .byl-language-two-cell { padding-left: 8px; }
  .byl-language-text { font-size: 14px; }
  .byl-player-tools { align-items: stretch; flex-direction: column; }
  .byl-subtitle-display-controls { align-items: flex-start; flex-direction: column; gap: 8px; }
  .byl-subtitle-style-group { margin-left: 0; width: 100%; }
  .byl-subtitle-panel.byl-subtitle-overlay.is-position-below { margin-top: 6px; border-radius: 12px; }
  .byl-subtitle-panel.byl-subtitle-overlay.is-position-overlay {
    bottom: 50px;
    width: 92%;
    max-width: 92%;
    margin: 0;
    border-radius: 12px;
  }
  .byl-subtitle-overlay.is-position-overlay.is-overlay-placement-bottom { bottom: 50px; }
  .byl-subtitle-overlay.is-position-overlay.is-overlay-placement-above-controls { bottom: 92px; }
  .byl-subtitle-card-section { padding: 10px 12px; }
  .byl-subtitle-overlay.is-position-overlay .byl-subtitle-card-section { padding: 5px 9px; }
}


/* Mobile learning settings: one unobtrusive control over the player. */
.byl-mobile-settings-dock,
.byl-mobile-settings-fab,
.byl-mobile-settings-sheet,
.byl-mobile-settings-backdrop { display: none; }

@media (max-width: 767px) {
  .byl-left-pane { padding: 12px; }
  .byl-desktop-player-tools,
  .byl-desktop-subtitle-controls { display: none !important; }
  .byl-transcript-toolbar,
  .byl-language-bar { display: none !important; }
  .byl-status:not([data-type="error"]) { display: none !important; }

  .byl-player-shell { position: relative; }
  .byl-mobile-settings-dock {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    min-height: 46px;
    margin-top: 6px;
  }
  .byl-mobile-settings-fab {
    display: inline-flex;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--byl-border);
    border-radius: 50%;
    background: var(--byl-surface-raised);
    color: var(--byl-text);
    box-shadow: 0 4px 14px rgba(16,24,40,.12);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
  }
  .byl-mobile-settings-fab:active { transform: scale(.96); }

  .byl-mobile-settings-backdrop {
    position: fixed;
    inset: 0;
    z-index: 99990;
    background: rgba(16,24,40,.5);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
  }
  .byl-mobile-settings-backdrop:not([hidden]) { display: block; }

  .byl-mobile-settings-sheet {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99991;
    max-height: min(62vh, 560px);
    overflow-y: auto;
    padding: 8px 16px calc(18px + env(safe-area-inset-bottom));
    border-radius: 22px 22px 0 0;
    background: var(--byl-surface-raised);
    color: var(--byl-text);
    box-shadow: 0 -18px 50px rgba(16,24,40,.22);
    overscroll-behavior: contain;
  }
  .byl-mobile-settings-sheet:not([hidden]) { display: block; }
  .byl-mobile-sheet-handle { width: 42px; height: 4px; border-radius: 99px; background: var(--byl-border); margin: 2px auto 10px; }
  .byl-mobile-sheet-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--byl-border); }
  .byl-mobile-sheet-header strong { font-size: 17px; }
  .byl-mobile-sheet-kicker { margin-bottom: 2px; color: var(--byl-accent); font-size: 10px; font-weight: 850; text-transform: uppercase; letter-spacing: .06em; }
  .byl-mobile-sheet-close { width: 38px; height: 38px; border: 1px solid var(--byl-border); border-radius: 50%; background: var(--byl-control-bg); color: var(--byl-text); font-size: 24px; line-height: 1; }
  .byl-mobile-sheet-section { padding: 12px 0; border-bottom: 1px solid var(--byl-divider); }
  .byl-mobile-sheet-section:last-child { border-bottom: 0; }
  .byl-mobile-sheet-section.is-highlighted { border-radius: 12px; background: var(--byl-accent-soft); box-shadow: 0 0 0 6px var(--byl-accent-soft); }
  .byl-mobile-sheet-section-title { margin-bottom: 8px; color: var(--byl-muted); font-size: 11px; font-weight: 850; text-transform: uppercase; letter-spacing: .05em; }
  .byl-mobile-switch-row,
  .byl-mobile-select-row { min-height: 46px; display: flex; align-items: center; justify-content: space-between; gap: 14px; font-size: 14px; font-weight: 700; }
  .byl-mobile-switch-row input { width: 20px; height: 20px; accent-color: var(--byl-accent); }
  .byl-mobile-select-row select { min-width: 132px; border: 1px solid var(--byl-border); border-radius: 10px; background: var(--byl-control-bg); color: var(--byl-text); padding: 8px 10px; }

  .byl-subtitle-panel.byl-subtitle-overlay.is-position-below { width: 100%; }
}


/* The player surface is the playback control for Bilibili; avoid a duplicate Play/Pause row. */
.byl-bilibili-tools { display: none !important; }

/* Stronger transcript hierarchy and quieter scroll chrome. */
.byl-transcript-row.is-active .byl-time { color: var(--byl-accent); }
.byl-transcript { scrollbar-width: thin; scrollbar-color: var(--byl-border) transparent; }
.byl-transcript::-webkit-scrollbar { width: 9px; }
.byl-transcript::-webkit-scrollbar-track { background: transparent; }
.byl-transcript::-webkit-scrollbar-thumb { border: 2px solid transparent; border-radius: 999px; background: var(--byl-border); background-clip: padding-box; }

/* Continue learning strip + scalable full library. */
.byl-continue { padding-top: 16px; padding-bottom: 16px; }
.byl-continue-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; margin-bottom: 12px; }
.byl-continue-header .byl-section-title { margin-bottom: 3px; color: var(--byl-text); font-size: 13px; letter-spacing: .04em; }
.byl-continue-subtitle { color: var(--byl-muted); font-size: 12px; line-height: 1.45; }
.byl-view-library { flex: 0 0 auto; color: var(--byl-accent); font-size: 13px; font-weight: 800; text-decoration: none; }
.byl-view-library:hover { text-decoration: underline; }

.byl-continue .byl-library-list { gap: 12px; scrollbar-width: thin; scroll-snap-type: x proximity; }
.byl-continue .byl-library-card { flex-basis: 248px; scroll-snap-align: start; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.byl-continue .byl-library-card:hover { transform: translateY(-2px); border-color: #c7d0ff; box-shadow: 0 10px 24px rgba(16,24,40,.10); }
.byl-library-card-media { position: relative; display: block !important; padding: 0 !important; }
.byl-library-card-media > img,
.byl-continue .byl-library-card-media > img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.byl-library-card-body { display: flex !important; flex-direction: column; gap: 7px; padding: 10px 11px 11px !important; }
.byl-library-card-title { display: -webkit-box; min-height: 34px; overflow: hidden; color: var(--byl-text); font-size: 13px; font-weight: 800; line-height: 1.3; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.byl-library-card-meta { padding: 0 !important; color: var(--byl-muted); font-size: 11px !important; font-weight: 750 !important; }
.byl-platform-badge { position: absolute; top: 8px; right: 8px; display: inline-flex !important; width: auto !important; padding: 4px 7px !important; border-radius: 999px; background: rgba(16,24,40,.78); color: #fff; font-size: 10px !important; font-weight: 800 !important; line-height: 1 !important; backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); }
.byl-card-progress { position: relative; display: block !important; padding: 0 !important; }
.byl-continue-card .byl-card-progress { height: 17px; border-radius: 999px; background: var(--byl-progress-track); overflow: hidden; }
.byl-card-progress-bar { position: absolute; inset: 0 auto 0 0; display: block !important; min-width: 0; padding: 0 !important; border-radius: inherit; background: var(--byl-accent); }
.byl-continue-card .byl-card-progress-label { position: relative; z-index: 1; display: block !important; padding: 1px 6px 0 !important; color: var(--byl-text); font-size: 10px !important; font-weight: 850 !important; line-height: 16px !important; text-align: right; }

.byl-library-page {
  --byl-bg: #f6f7fb;
  --byl-card: #ffffff;
  --byl-text: #172033;
  --byl-muted: #667085;
  --byl-border: #e4e7ec;
  --byl-accent: #5b5bd6;
  --byl-surface-raised: #ffffff;
  --byl-control-bg: #ffffff;
  --byl-control-hover: #fafaff;
  --byl-divider: #edf0f4;
  --byl-progress-track: #eaecf0;
  width: min(1440px, calc(100% - 28px));
  margin: 24px auto;
  padding: 26px;
  border: 1px solid var(--byl-border);
  border-radius: 24px;
  background: var(--byl-bg);
  color: var(--byl-text);
  box-shadow: 0 18px 50px rgba(16,24,40,.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.byl-library-page *, .byl-library-page *::before, .byl-library-page *::after { box-sizing: border-box; }
.byl-library-page .screen-reader-text { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.byl-full-library-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.byl-full-library-header h1 { margin: 4px 0 8px; color: var(--byl-text); font-size: clamp(28px, 4vw, 42px); line-height: 1.05; }
.byl-full-library-header p { max-width: 720px; margin: 0; color: var(--byl-muted); font-size: 14px; line-height: 1.6; }
.byl-back-learning { display: inline-flex; align-items: center; text-decoration: none; white-space: nowrap; }

.byl-library-controls { display: grid; grid-template-columns: minmax(260px, 1.7fr) repeat(6, minmax(125px, .72fr)); gap: 10px; margin-bottom: 12px; }
.byl-library-controls input,
.byl-library-controls select { width: 100%; min-height: 44px; border: 1px solid var(--byl-border); border-radius: 11px; background: var(--byl-control-bg); color: var(--byl-text); padding: 10px 12px; font: inherit; font-size: 13px; outline: none; }
.byl-library-controls input:focus,
.byl-library-controls select:focus { border-color: var(--byl-accent); box-shadow: 0 0 0 3px rgba(91,91,214,.12); }
.byl-library-search { display: block; min-width: 0; }
.byl-library-results-meta { margin: 14px 2px; color: var(--byl-muted); font-size: 12px; font-weight: 750; }

.byl-full-library-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.byl-full-library-card { min-width: 0; overflow: hidden; border: 1px solid var(--byl-border); border-radius: 16px; background: var(--byl-card); box-shadow: 0 4px 14px rgba(16,24,40,.045); transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.byl-full-library-card:hover { transform: translateY(-3px); border-color: #c7d0ff; box-shadow: 0 14px 30px rgba(16,24,40,.10); }
.byl-full-library-card-link { display: block; height: 100%; color: inherit; text-decoration: none; }
.byl-full-library-media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #e9ebf1; }
.byl-full-library-media img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .22s ease; }
.byl-full-library-card:hover .byl-full-library-media img { transform: scale(1.025); }
.byl-full-library-content { display: flex; min-height: 158px; flex-direction: column; gap: 10px; padding: 14px; }
.byl-full-library-content h2 { display: -webkit-box; min-height: 43px; margin: 0; overflow: hidden; color: var(--byl-text); font-size: 15px; font-weight: 820; line-height: 1.42; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.byl-library-series-meta { min-height: 16px; color: #475467; font-size: 11px; font-weight: 800; line-height: 1.35; }
.byl-library-language-pair { color: var(--byl-muted); font-size: 11px; font-weight: 800; letter-spacing: .04em; }
.byl-library-header-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.byl-full-card-progress { display: grid !important; gap: 6px; }
.byl-card-progress-track { position: relative; height: 6px; overflow: hidden; border-radius: 999px; background: var(--byl-progress-track); }
.byl-full-card-progress .byl-card-progress-bar { position: absolute; inset: 0 auto 0 0; background: var(--byl-accent); }
.byl-full-card-progress .byl-card-progress-label { color: var(--byl-muted); font-size: 11px; font-weight: 700; }
.byl-library-card-action { margin-top: auto; color: var(--byl-accent); font-size: 12px; font-weight: 850; }
.byl-library-empty { padding: 50px 20px; border: 1px dashed var(--byl-border); border-radius: 16px; background: var(--byl-surface-raised); color: var(--byl-muted); text-align: center; }
.byl-library-more { display: flex; justify-content: center; padding-top: 22px; }

@media (max-width: 1180px) {
  .byl-library-controls { grid-template-columns: minmax(250px, 2fr) repeat(2, minmax(150px, 1fr)); }
  .byl-full-library-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 780px) {
  .byl-continue-header { align-items: flex-start; }
  .byl-continue-subtitle { display: none; }
  .byl-continue .byl-library-card { flex-basis: 180px; }
  .byl-library-page { width: min(100% - 18px, 1440px); margin: 10px auto; padding: 16px; border-radius: 16px; }
  .byl-full-library-header { flex-direction: column; gap: 14px; }
  .byl-library-controls { grid-template-columns: 1fr 1fr; }
  .byl-library-search { grid-column: 1 / -1; }
  .byl-full-library-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
}

@media (max-width: 520px) {
  .byl-library-controls { grid-template-columns: 1fr; }
  .byl-library-search { grid-column: auto; }
  .byl-full-library-grid { grid-template-columns: 1fr; }
  .byl-full-library-content { min-height: 0; }
}

/* Series library */
.byl-series-page {
  --byl-bg: #f6f7fb;
  --byl-card: #ffffff;
  --byl-text: #172033;
  --byl-muted: #667085;
  --byl-border: #e4e7ec;
  --byl-accent: #5b5bd6;
  --byl-surface-raised: #ffffff;
  --byl-control-bg: #ffffff;
  --byl-control-hover: #fafaff;
  --byl-divider: #edf0f4;
  --byl-progress-track: #eaecf0;
  width: min(1440px, calc(100% - 28px));
  margin: 24px auto;
  padding: 26px;
  border: 1px solid var(--byl-border);
  border-radius: 24px;
  background: var(--byl-bg);
  color: var(--byl-text);
  box-shadow: 0 18px 50px rgba(16,24,40,.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.byl-series-page *, .byl-series-page *::before, .byl-series-page *::after { box-sizing: border-box; }
.byl-series-results-meta { margin: 0 2px 14px; color: var(--byl-muted); font-size: 12px; font-weight: 750; }
.byl-series-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.byl-series-card { min-width: 0; overflow: hidden; border: 1px solid var(--byl-border); border-radius: 18px; background: var(--byl-surface-raised); box-shadow: 0 4px 14px rgba(16,24,40,.05); transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.byl-series-card:hover { transform: translateY(-3px); border-color: #c7d0ff; box-shadow: 0 14px 30px rgba(16,24,40,.10); }
.byl-series-card-link { display: block; height: 100%; color: inherit; text-decoration: none; }
.byl-series-card-media { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #e9ebf1; }
.byl-series-card-media img { width: 100%; height: 100%; display: block; object-fit: cover; }
.byl-series-episode-count { position: absolute; right: 10px; bottom: 10px; padding: 5px 8px; border-radius: 999px; background: rgba(17,24,39,.78); color: #fff; font-size: 10px; font-weight: 850; backdrop-filter: blur(5px); }
.byl-series-card-body { display: flex; min-height: 190px; flex-direction: column; gap: 10px; padding: 15px; }
.byl-series-card-body h2 { margin: 0; color: var(--byl-text); font-size: 17px; line-height: 1.3; }
.byl-series-card-body p { display: -webkit-box; min-height: 39px; margin: 0; overflow: hidden; color: var(--byl-muted); font-size: 12px; line-height: 1.55; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.byl-series-progress { display: grid; gap: 6px; }
.byl-series-progress > span { color: var(--byl-muted); font-size: 11px; font-weight: 750; }
.byl-series-progress .byl-card-progress-bar,
.byl-series-detail-progress .byl-card-progress-bar { position: absolute; inset: 0 auto 0 0; background: var(--byl-accent); }
.byl-series-detail { min-width: 0; }
.byl-series-back { margin-bottom: 16px; }
.byl-series-detail-hero { display: grid; grid-template-columns: minmax(260px, 440px) minmax(0, 1fr); gap: 28px; align-items: center; margin-bottom: 24px; padding: 22px; border: 1px solid var(--byl-border); border-radius: 20px; background: var(--byl-surface-raised); }
.byl-series-detail-hero > img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 14px; background: #e9ebf1; }
.byl-series-detail-hero h1 { margin: 6px 0 8px; color: var(--byl-text); font-size: clamp(26px, 4vw, 42px); line-height: 1.08; }
.byl-series-detail-hero p { max-width: 760px; margin: 0 0 16px; color: var(--byl-muted); font-size: 14px; line-height: 1.6; }
.byl-series-detail-progress { display: grid; max-width: 560px; gap: 7px; margin-bottom: 16px; }
.byl-series-detail-progress strong { color: var(--byl-text); font-size: 12px; }
.byl-series-episodes { display: grid; gap: 10px; }
.byl-series-episode-card { display: grid; grid-template-columns: 72px minmax(0, 1fr) 30px; gap: 14px; align-items: center; padding: 14px 16px; border: 1px solid var(--byl-border); border-radius: 14px; background: var(--byl-surface-raised); color: inherit; text-decoration: none; transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease; }
.byl-series-episode-card:hover { transform: translateY(-1px); border-color: #c7d0ff; box-shadow: 0 8px 18px rgba(16,24,40,.07); }
.byl-series-episode-number { display: inline-grid; place-items: center; min-height: 34px; border-radius: 10px; background: #eef2ff; color: #4f46e5; font-size: 11px; font-weight: 900; }
.byl-series-episode-content { display: grid; min-width: 0; gap: 4px; }
.byl-series-episode-content strong { overflow: hidden; color: var(--byl-text); font-size: 14px; text-overflow: ellipsis; white-space: nowrap; }
.byl-series-episode-content span { color: var(--byl-muted); font-size: 11px; font-weight: 700; }
.byl-series-episode-arrow { color: var(--byl-accent); font-size: 20px; font-weight: 800; text-align: center; }

@media (max-width: 1180px) {
  .byl-series-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 780px) {
  .byl-series-page { width: min(100% - 18px, 1440px); margin: 10px auto; padding: 16px; border-radius: 16px; }
  .byl-series-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .byl-series-detail-hero { grid-template-columns: 1fr; padding: 16px; gap: 18px; }
}
@media (max-width: 520px) {
  .byl-series-grid { grid-template-columns: 1fr; }
  .byl-series-card-body { min-height: 0; }
  .byl-series-episode-card { grid-template-columns: 56px minmax(0, 1fr) 22px; gap: 10px; padding: 12px; }
}


/* Series mini playlist on the learning page */
.byl-series-nav {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  padding: 12px;
  border: 1px solid var(--byl-border);
  border-radius: 14px;
  background: var(--byl-surface-raised);
  box-shadow: 0 4px 14px rgba(16,24,40,.04);
}
.byl-series-nav[hidden] { display: none !important; }
.byl-series-nav-head { display:flex; align-items:center; justify-content:space-between; gap:12px; min-width:0; }
.byl-series-nav-heading { display:flex; align-items:baseline; gap:8px; min-width:0; }
.byl-series-nav-heading strong { overflow:hidden; color:var(--byl-text); font-size:13px; font-weight:900; text-overflow:ellipsis; white-space:nowrap; }
.byl-series-nav-heading span { flex:0 0 auto; color:var(--byl-muted); font-size:10px; font-weight:800; text-transform:uppercase; letter-spacing:.05em; }
.byl-series-view-link { flex:0 0 auto; color:var(--byl-accent); font-size:11px; font-weight:850; text-decoration:none; }
.byl-series-view-link:hover { text-decoration:underline; }
.byl-series-episode-rail { display:flex; gap:9px; min-width:0; overflow-x:auto; padding:1px 1px 4px; scroll-snap-type: x proximity; scrollbar-width:thin; scrollbar-color:var(--byl-divider) transparent; }
.byl-series-mini-card { position:relative; flex:0 0 224px; min-width:0; display:grid; grid-template-columns:86px minmax(0,1fr); gap:9px; align-items:center; min-height:70px; padding:7px; border:1px solid var(--byl-border); border-radius:11px; background:var(--byl-control-bg); color:var(--byl-text); text-align:left; cursor:pointer; scroll-snap-align:center; transition:border-color .15s ease, background .15s ease, box-shadow .15s ease, transform .15s ease; }
.byl-series-mini-card:hover { transform:translateY(-1px); border-color:var(--byl-accent); background:var(--byl-control-hover); }
.byl-series-mini-card.is-current { border-color:var(--byl-accent); background:var(--byl-accent-soft); box-shadow:0 0 0 1px color-mix(in srgb,var(--byl-accent) 34%,transparent),0 8px 22px rgba(79,70,229,.12); cursor:default; }
.byl-series-mini-media { width:86px; aspect-ratio:16 / 9; overflow:hidden; border-radius:8px; background:var(--byl-surface-soft); }
.byl-series-mini-media img { display:block; width:100%; height:100%; object-fit:cover; }
.byl-series-mini-fallback { display:grid; width:100%; height:100%; place-items:center; color:var(--byl-muted); font-size:10px; font-weight:900; }
.byl-series-mini-content { display:grid; min-width:0; gap:3px; }
.byl-series-mini-eyebrow { display:flex; align-items:center; gap:5px; min-width:0; color:var(--byl-muted); font-size:9px; font-weight:900; letter-spacing:.05em; text-transform:uppercase; }
.byl-series-now-playing { max-width:88px; overflow:hidden; padding:2px 5px; border-radius:999px; background:var(--byl-accent); color:#fff; font-size:8px; line-height:1.25; text-overflow:ellipsis; white-space:nowrap; }
.byl-series-complete-badge { display:inline-grid; width:16px; height:16px; place-items:center; border-radius:50%; background:rgba(52,211,153,.14); color:#34d399; font-size:9px; }
.byl-series-mini-content strong { overflow:hidden; color:var(--byl-text); font-size:11px; line-height:1.25; text-overflow:ellipsis; white-space:nowrap; }
.byl-series-mini-progress-text { color:var(--byl-muted); font-size:9px; font-weight:700; }
.byl-series-mini-progress { display:block; height:3px; overflow:hidden; border-radius:999px; background:var(--byl-divider); }
.byl-series-mini-progress > span { display:block; height:100%; border-radius:inherit; background:var(--byl-accent); }
.byl-series-nav-actions { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); gap:8px; align-items:center; }
.byl-series-nav-btn { min-width:0; min-height:38px; display:grid; gap:2px; align-content:center; border:1px solid var(--byl-border); border-radius:9px; background:var(--byl-control-bg); color:var(--byl-text); padding:6px 9px; font:inherit; cursor:pointer; }
.byl-series-nav-btn:hover { border-color:var(--byl-accent); background:var(--byl-accent-soft); color:var(--byl-text); }
.byl-series-nav-btn-prev { grid-column:1; text-align:left; }
.byl-series-nav-btn-next { grid-column:2; text-align:right; }
.byl-series-nav-direction { color:var(--byl-text); font-size:10px; font-weight:900; }
.byl-series-nav-episode-label { overflow:hidden; color:var(--byl-muted); font-size:9px; font-weight:700; text-overflow:ellipsis; white-space:nowrap; }
@media (max-width: 620px) {
  .byl-series-nav { padding:10px; }
  .byl-series-nav-head { align-items:flex-start; }
  .byl-series-nav-heading { display:grid; gap:2px; }
  .byl-series-episode-rail { margin-inline:-2px; scroll-snap-type:x mandatory; }
  .byl-series-mini-card { flex-basis:226px; }
  .byl-series-nav-actions { grid-template-columns:1fr 1fr; }
  .byl-series-nav-btn { width:100%; }
}

/* Learning discovery rows */
.byl-discovery { margin-top: 24px; display: grid; gap: 24px; }
.byl-discovery-section { border-top: 1px solid var(--byl-border); padding-top: 20px; }
.byl-discovery-header { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.byl-discovery-header h2 { margin: 0; color: var(--byl-text); font-size: 1.05rem; }
.byl-discovery-header p { margin: 4px 0 0; color: var(--byl-muted); font-size: 12px; line-height: 1.45; }
.byl-discovery-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.byl-discovery-card { min-width: 0; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.byl-discovery-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--byl-accent) 55%, var(--byl-border)); }
.byl-discovery-card .byl-library-card-media { aspect-ratio: 16 / 9; }
.byl-discovery-card .byl-library-card-media > img { width: 100%; height: 100%; object-fit: cover; }
.byl-discovery-card .byl-card-progress { height: 17px; border-radius: 999px; background: var(--byl-progress-track); overflow: hidden; }
.byl-discovery-card .byl-card-progress-label { position: relative; z-index: 1; display: block !important; padding: 1px 6px 0 !important; color: var(--byl-text); font-size: 10px !important; font-weight: 850 !important; line-height: 16px !important; text-align: right; }

@media (max-width: 767px) {
  .byl-discovery { gap: 20px; }
  .byl-discovery-header { align-items: flex-start; }
  .byl-discovery-list { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; overscroll-behavior-inline: contain; padding-bottom: 8px; scrollbar-width: thin; }
  .byl-discovery-card { flex: 0 0 min(82vw, 320px); scroll-snap-align: start; min-height: 44px; }
}

/* Series episode thumbnails */
.byl-series-episode-card { position: relative; display: grid; grid-template-columns: 160px auto minmax(0, 1fr) auto; align-items: center; gap: 16px; }
.byl-series-episode-media { width: 160px; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: var(--byl-surface-soft); }
.byl-series-episode-thumb { width: 100%; height: 100%; object-fit: cover; display: block; }
.byl-series-episode-media .byl-library-thumb-fallback { width: 100%; height: 100%; min-height: 0; display: grid; place-items: center; }

@media (max-width: 767px) {
  .byl-series-episode-card { grid-template-columns: 120px minmax(0, 1fr) auto; gap: 12px; padding: 12px; }
  .byl-series-episode-media { width: 120px; }
  .byl-series-episode-number { position: absolute; left: 18px; top: 18px; min-height: auto; padding: 5px 8px; border-radius: 999px; backdrop-filter: blur(8px); }
}

/* Library filter UX: compact desktop toolbar + mobile bottom sheet. */
.byl-library-compact-header { margin-bottom: 18px; }
.byl-library-compact-header h1 { margin-bottom: 0; }
.byl-library-controls {
  display: grid;
  grid-template-columns: minmax(220px, 1.35fr) minmax(0, 4fr) minmax(145px, .82fr);
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.byl-library-filter-panel { min-width: 0; }
.byl-library-filter-backdrop,
.byl-library-filter-sheet-header,
.byl-library-filter-sheet-actions,
.byl-library-mobile-actions { display: none; }
.byl-library-filter-sheet { min-width: 0; }
.byl-library-filter-fields { display: grid; grid-template-columns: repeat(5, minmax(112px, 1fr)); gap: 10px; }
.byl-library-filter-fields label { min-width: 0; }
.byl-library-filter-fields label > span { display: none; }
.byl-library-filter-fields select,
.byl-library-sort-desktop select { width: 100%; min-height: 44px; border: 1px solid var(--byl-border); border-radius: 11px; background: var(--byl-control-bg); color: var(--byl-text); padding: 10px 12px; font: inherit; font-size: 13px; outline: none; }
.byl-library-filter-fields select:focus,
.byl-library-sort-desktop select:focus { border-color: var(--byl-accent); box-shadow: 0 0 0 3px rgba(91,91,214,.12); }
.byl-library-sort-desktop { display: block; min-width: 0; }
.byl-library-active-filters { display: flex; flex-wrap: wrap; gap: 7px; margin: 4px 0 12px; }
.byl-library-filter-chip { display: inline-flex; align-items: center; gap: 7px; min-height: 32px; padding: 6px 10px; border: 1px solid color-mix(in srgb, var(--byl-accent) 36%, var(--byl-border)); border-radius: 999px; background: color-mix(in srgb, var(--byl-accent) 9%, var(--byl-surface-raised)); color: var(--byl-text); font: inherit; font-size: 12px; font-weight: 750; cursor: pointer; }
.byl-library-filter-chip > span:last-child { color: var(--byl-muted); font-size: 16px; line-height: 1; }
.byl-library-filter-chip:hover { border-color: var(--byl-accent); }
.byl-library-sort-menu { min-width: 210px; overflow: hidden; border: 1px solid var(--byl-border); border-radius: 13px; background: var(--byl-surface-raised); box-shadow: 0 16px 38px rgba(16,24,40,.18); }
.byl-library-sort-menu button { display: flex; width: 100%; min-height: 42px; align-items: center; border: 0; border-bottom: 1px solid var(--byl-divider); background: transparent; color: var(--byl-text); padding: 9px 12px; font: inherit; font-size: 13px; text-align: left; cursor: pointer; }
.byl-library-sort-menu button:last-child { border-bottom: 0; }
.byl-library-sort-menu button:hover,
.byl-library-sort-menu button.is-active { background: var(--byl-control-hover); color: var(--byl-accent); }

@media (max-width: 780px) {
  .byl-library-compact-header { margin-bottom: 14px; }
  .byl-library-controls { display: block; margin-bottom: 8px; }
  .byl-library-search { display: block; margin-bottom: 10px; }
  .byl-library-sort-desktop { display: none; }
  .byl-library-mobile-actions { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 8px; }
  .byl-library-mobile-action { display: flex; width: 100%; min-height: 44px; align-items: center; justify-content: center; gap: 7px; border: 1px solid var(--byl-border); border-radius: 12px; background: var(--byl-surface-raised); color: var(--byl-text); padding: 9px 12px; font: inherit; font-size: 13px; font-weight: 800; cursor: pointer; }
  .byl-library-mobile-action strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .byl-library-filter-count { display: inline-grid; min-width: 21px; height: 21px; place-items: center; border-radius: 999px; background: var(--byl-accent); color: #fff; font-size: 11px; line-height: 1; }
  .byl-library-sort-compact { position: relative; min-width: 0; }
  .byl-library-sort-menu { position: absolute; z-index: 45; top: calc(100% + 7px); right: 0; width: min(260px, 86vw); }
  .byl-library-active-filters { flex-wrap: nowrap; gap: 7px; margin: 9px 0 12px; overflow-x: auto; scrollbar-width: none; }
  .byl-library-active-filters::-webkit-scrollbar { display: none; }
  .byl-library-filter-chip { flex: 0 0 auto; }

  .byl-library-filter-panel { position: fixed; z-index: 10020; inset: 0; visibility: hidden; pointer-events: none; }
  .byl-library-filter-panel.is-open { visibility: visible; pointer-events: auto; }
  .byl-library-filter-backdrop { display: block; position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: rgba(8,11,17,.62); opacity: 0; transition: opacity .2s ease; }
  .byl-library-filter-panel.is-open .byl-library-filter-backdrop { opacity: 1; }
  .byl-library-filter-sheet { position: absolute; right: 0; bottom: 0; left: 0; max-height: min(82dvh, 720px); overflow-y: auto; border: 1px solid var(--byl-border); border-radius: 20px 20px 0 0; background: var(--byl-surface-raised); padding: 16px 16px calc(16px + env(safe-area-inset-bottom)); box-shadow: 0 -18px 50px rgba(0,0,0,.2); transform: translateY(105%); transition: transform .22s ease; }
  .byl-library-filter-panel.is-open .byl-library-filter-sheet { transform: translateY(0); }
  .byl-library-filter-sheet-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
  .byl-library-filter-sheet-header strong { font-size: 17px; }
  .byl-library-filter-close { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid var(--byl-border); border-radius: 999px; background: var(--byl-control-bg); color: var(--byl-text); font-size: 22px; line-height: 1; cursor: pointer; }
  .byl-library-filter-fields { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .byl-library-filter-fields label { display: grid; gap: 6px; }
  .byl-library-filter-fields label > span { display: block; color: var(--byl-muted); font-size: 11px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
  .byl-library-filter-fields select { min-height: 48px; }
  .byl-library-filter-sheet-actions { display: grid; grid-template-columns: .8fr 1.2fr; gap: 9px; position: sticky; bottom: calc(-16px - env(safe-area-inset-bottom)); margin: 16px -16px calc(-16px - env(safe-area-inset-bottom)); padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); border-top: 1px solid var(--byl-divider); background: var(--byl-surface-raised); }
  .byl-library-filter-sheet-actions .byl-btn { min-height: 46px; justify-content: center; }
  body.byl-library-filter-open { overflow: hidden; }
}