/* ════════════════════════════════════════════════════════════════════════════
   YouTube Teacher Partner videos — Teacher Selection (Step 1/2) + Player
   Same token/theme-dark convention as notesViewer.css
════════════════════════════════════════════════════════════════════════════ */

:root {
  --vts-bg: #ffffff;
  --vts-bg-secondary: #f9fafb;
  --vts-text: #1f2937;
  --vts-text-secondary: #6b7280;
  --vts-border: #e5e7eb;
  --vts-accent: #d97e1a;
  --vts-teal: #0d6d64;
}
.theme-dark {
  --vts-bg: #0d1117;
  --vts-bg-secondary: #161b22;
  --vts-text: #e6edf3;
  --vts-text-secondary: #8b949e;
  --vts-border: #30363d;
}

/* Inline button on the exercise question screen */
.vts-videos-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 12px; border: none;
  background: var(--vts-accent); color: #2a1400; font-weight: 700; font-size: 0.9rem;
  cursor: pointer; margin: 10px 0 16px;
}
.vts-videos-btn.hidden { display: none; }

.vts-container { padding: 12px 16px 32px; }
.vts-list { display: flex; flex-direction: column; gap: 12px; }

.vts-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--vts-bg-secondary); border: 1px solid var(--vts-border);
  border-radius: 14px; padding: 14px; cursor: pointer; text-align: left;
  width: 100%; font-family: inherit; color: var(--vts-text);
}
.vts-card:focus-visible { outline: 2px solid var(--vts-accent); outline-offset: 2px; }
.vts-thumb {
  width: 52px; height: 52px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, #d97e1a, #f2a640);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1.1rem;
  overflow: hidden;
}
.vts-thumb img { width: 100%; height: 100%; object-fit: cover; }
.vts-info { flex: 1; min-width: 0; }
.vts-info strong { display: block; font-size: 0.95rem; }
.vts-info small { display: block; color: var(--vts-text-secondary); font-size: 0.78rem; margin-top: 2px; }
.vts-badge {
  font-size: 0.68rem; font-weight: 700; padding: 3px 9px; border-radius: 20px;
  background: rgba(217,126,26,0.16); color: var(--vts-accent); flex-shrink: 0;
}

.vts-part-card {
  display: flex; align-items: center; gap: 10px;
  background: var(--vts-bg-secondary); border: 1px solid var(--vts-border);
  border-radius: 12px; padding: 14px 16px; cursor: pointer; width: 100%;
  font-family: inherit; color: var(--vts-text); font-weight: 600; font-size: 0.92rem;
}

.vts-empty { text-align: center; padding: 40px 20px; color: var(--vts-text-secondary); }

/* Embedded player */
.vp-container { padding: 0; }
.vp-frame-wrap {
  position: relative; width: 100%; aspect-ratio: 16 / 9; background: #000;
}
.vp-iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* Rotate-to-fill: when the device is in landscape, the player fills the
   whole viewport — pure CSS/JS, no native Android code needed. The
   'vp-landscape-fill' class is toggled by videoTeacherSelect.js listening
   to matchMedia('(orientation: landscape)'), only while screen-video-player
   is the active screen. */
body.vp-landscape-fill #screen-video-player .quiz-header { display: none; }
body.vp-landscape-fill #screen-video-player .vp-container,
body.vp-landscape-fill #screen-video-player .vp-frame-wrap {
  position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 500;
  aspect-ratio: auto;
}