/* ══════════════════════════════════════════════════════
   Teacher Studio (yts-) — Remote streaming for teachers
   ══════════════════════════════════════════════════════ */

.yts {
  background: #0F0F0F;
  min-height: 100vh;
  padding: 0;
  overflow-x: hidden;
}

/* ── Auth Gate ── */
.yts-gate {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 2rem;
}

.yts-gate__card {
  text-align: center;
  background: #1a1a1a;
  border-radius: 12px;
  padding: 3rem 2rem;
  max-width: 400px;
  width: 100%;
}

.yts-gate__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(111, 106, 102, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.yts-gate__title {
  color: #FFFCF9;
  font-size: 1.1rem;
  margin: 0;
}

/* ── Hero ── */
.yts-hero {
  text-align: center;
  padding: 4rem 1.5rem 2rem;
}

.yts-hero__tagline {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #6F6A66;
  margin-bottom: 1rem;
}

.yts-hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  color: #FFFCF9;
  margin: 0 0 1rem;
  line-height: 1.1;
}

.yts-hero__subtitle {
  font-size: 1rem;
  color: #6F6A66;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ── Main Grid ── */
.yts-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.yts-main__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: start;
}

/* ── Camera Preview ── */
.yts-preview {
  background: #1a1a1a;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
}

.yts-preview__header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.yts-preview__title {
  font-size: 0.95rem;
  color: #FFFCF9;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.yts-preview__viewport {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #111;
  overflow: hidden;
}

#yts-preview-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scaleX(-1);
}

.yts-preview__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: #111;
  z-index: 1;
}

.yts-preview__placeholder--hidden {
  display: none;
}

/* Live badge on preview */
.yts-preview__live-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(247, 92, 3, 0.9);
  color: #fff;
  padding: 0.3rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  z-index: 2;
}

.yts-preview__live-dot {
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: yts-pulse 1.5s ease-in-out infinite;
}

@keyframes yts-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

/* Elapsed timer on preview */
.yts-preview__elapsed {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(0,0,0,0.7);
  color: #FFFCF9;
  padding: 0.3rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  z-index: 2;
}

/* ── Device Selectors ── */
.yts-devices {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.yts-devices__row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.yts-devices__label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: #6F6A66;
  min-width: 90px;
  flex-shrink: 0;
}

.yts-devices__select {
  flex: 1;
  background: #0F0F0F;
  border: 1px solid rgba(255,255,255,0.1);
  color: #FFFCF9;
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: border-color 0.3s ease;
}

.yts-devices__select:focus {
  border-color: #f75c03;
}

/* ── Controls Panel ── */
.yts-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Session Picker ── */
.yts-sessions {
  background: #1a1a1a;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
}

.yts-sessions__title {
  font-size: 0.95rem;
  color: #FFFCF9;
  margin: 0;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.yts-sessions__list {
  max-height: 360px;
  overflow-y: auto;
}

.yts-sessions__loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.yts-sessions__empty {
  color: #6F6A66;
  font-size: 0.85rem;
  text-align: center;
  padding: 2rem 1rem;
}

.yts-sessions__item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  cursor: pointer;
  transition: background 0.2s ease;
}

.yts-sessions__item:last-child {
  border-bottom: none;
}

.yts-sessions__item:hover {
  background: rgba(247, 92, 3, 0.05);
}

.yts-sessions__item--selected {
  background: rgba(247, 92, 3, 0.1);
  border-left: 3px solid #f75c03;
}

.yts-sessions__item-date {
  text-align: center;
  min-width: 44px;
  flex-shrink: 0;
  background: rgba(247,92,3,0.08);
  border-radius: 6px;
  padding: 0.35rem 0.45rem;
}

.yts-sessions__item-day-label {
  font-size: 0.55rem;
  font-weight: 700;
  color: #f75c03;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.yts-sessions__item-day {
  font-size: 0.75rem;
  font-weight: 700;
  color: #FFFCF9;
  line-height: 1.2;
  white-space: nowrap;
}

.yts-sessions__item-info {
  flex: 1;
  min-width: 0;
}

.yts-sessions__item-name {
  color: #FFFCF9;
  font-size: 0.88rem;
  font-weight: 700;
  margin: 0 0 0.15rem;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.yts-sessions__item-time {
  color: #999;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.yts-sessions__item-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 2rem;
  flex-shrink: 0;
}

.yts-sessions__item-tag--live {
  background: rgba(247, 92, 3, 0.15);
  color: #f75c03;
  border: 1px solid rgba(247,92,3,0.3);
}

/* Stream type badge on session cards */
.yts-sessions__item-type {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  margin-top: 0.2rem;
  color: #6F6A66;
  background: rgba(111,106,102,0.1);
}

.yts-sessions__item-type--interactive {
  color: #3f99a5;
  background: rgba(63,153,165,0.1);
}

.yts-sessions__item-type--panel {
  color: #f59e0b;
  background: rgba(245,158,11,0.1);
}

/* ── Status ── */
.yts-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.25rem;
  background: #1a1a1a;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.06);
}

.yts-status__indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #6F6A66;
  flex-shrink: 0;
  transition: background 0.3s ease;
}

.yts-status--idle .yts-status__indicator { background: #6F6A66; }
.yts-status--connecting .yts-status__indicator { background: #f59e0b; animation: yts-pulse 1s infinite; }
.yts-status--live .yts-status__indicator { background: #f75c03; animation: yts-pulse 1.5s infinite; }
.yts-status--ended .yts-status__indicator { background: #22c55e; }
.yts-status--error .yts-status__indicator { background: #ef4444; }

#yts-status-text {
  font-size: 0.85rem;
  color: #FFFCF9;
}

/* ── Action Buttons ── */
.yts-actions {
  display: flex;
  gap: 0.75rem;
}

.yts-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease, opacity 0.3s ease, transform 0.15s ease;
  white-space: nowrap;
}

.yts-btn:active {
  transform: scale(0.97);
}

.yts-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.yts-btn--outline {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: #FFFCF9;
}

.yts-btn--outline:hover:not(:disabled) {
  border-color: #f75c03;
  color: #f75c03;
}

.yts-btn--live {
  background: #f75c03;
  color: #fff;
  flex: 1;
}

.yts-btn--live:hover:not(:disabled) {
  background: #d94f02;
}

.yts-btn--end {
  background: #ef4444;
  color: #fff;
  flex: 1;
}

.yts-btn--end:hover:not(:disabled) {
  background: #dc2626;
}

/* ── Spinner ── */
.yts-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid #333;
  border-top-color: #f75c03;
  border-radius: 50%;
  animation: yts-spin 0.8s linear infinite;
}

@keyframes yts-spin {
  to { transform: rotate(360deg); }
}

/* ── Footer ── */
.yts-footer {
  text-align: center;
  padding: 3rem 1.5rem 4rem;
}

.yts-footer__line {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #f75c03, transparent);
  margin: 0 auto 1.5rem;
}

.yts-footer__text {
  color: #6F6A66;
  font-size: 0.85rem;
}

.yts-footer__text a {
  color: #f75c03;
  text-decoration: none;
}

.yts-footer__text a:hover {
  text-decoration: underline;
}

/* ── Confirm Dialog ── */
.yts-confirm {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.7);
  z-index: 9999;
  padding: 1rem;
}

.yts-confirm__box {
  background: #1a1a1a;
  border-radius: 12px;
  padding: 2rem;
  max-width: 380px;
  width: 100%;
  text-align: center;
}

.yts-confirm__text {
  color: #FFFCF9;
  font-size: 1rem;
  margin: 0 0 1.5rem;
}

.yts-confirm__actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .yts-main__grid {
    grid-template-columns: 1fr;
  }

  .yts-hero {
    padding: 3rem 1rem 1.5rem;
  }

  .yts-main {
    padding: 0 0.75rem;
  }

  .yts-devices__row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
  }

  .yts-devices__label {
    min-width: 0;
  }

  .yts-sessions__item-name {
    white-space: normal;
    word-break: break-word;
  }

  .yts-actions {
    flex-direction: column;
  }
}

/* ═══════════════════════════════════════════════════════
   LIVE MODE — video becomes main, controls overlay
   ═══════════════════════════════════════════════════════ */

.yts--live-mode .yts-hero {
  display: none;
}

.yts--live-mode .yts-main {
  max-width: 100%;
  padding: 0;
}

.yts--live-mode .yts-main__grid {
  grid-template-columns: 1fr;
  gap: 0;
}

.yts--live-mode .yts-preview {
  border-radius: 0;
  border: none;
  background: #000;
}

.yts--live-mode .yts-preview__header {
  display: none;
}

.yts--live-mode .yts-preview__viewport {
  aspect-ratio: auto;
  height: calc(100vh - 160px);
  min-height: 300px;
  max-height: 80vh;
}

.yts--live-mode #yts-preview-video {
  object-fit: contain;
  background: #000;
}

.yts--live-mode .yts-devices {
  display: none;
}

.yts--live-mode .yts-controls {
  padding: 0.75rem 1.5rem;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
  background: #111;
}

.yts--live-mode .yts-sessions {
  display: none;
}

.yts--live-mode .yts-status {
  background: transparent;
  border: none;
  padding: 0;
  flex-shrink: 0;
}

.yts--live-mode .yts-actions {
  margin-left: auto;
  flex-shrink: 0;
}

.yts--live-mode .yts-footer {
  display: none;
}

/* ── Live Controls Overlay (on video) ── */
.yts-live-controls {
  position: absolute;
  bottom: 3.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 0.5rem 0.75rem;
  border-radius: 2rem;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.yts-preview__viewport:hover .yts-live-controls,
.yts-live-controls:hover {
  opacity: 1;
}

/* Always show on touch devices */
@media (hover: none) {
  .yts-live-controls {
    opacity: 1;
  }
}

.yts-live-controls__btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.08);
  color: #FFFCF9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.yts-live-controls__btn:active {
  transform: scale(0.92);
}

.yts-live-controls__btn--active {
  border-color: rgba(247, 92, 3, 0.5);
  background: rgba(247, 92, 3, 0.15);
}

.yts-live-controls__btn--off {
  border-color: rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

.yts-live-controls__btn:hover {
  background: rgba(255,255,255,0.15);
}