/* Live tutoring room — tutor + student */
.session-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.session-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 0.85rem var(--space);
}

.session-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.session-brand {
  font-family: var(--font-heading);
  font-size: var(--step-3);
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.session-main {
  flex: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: var(--space);
  width: 100%;
}

.session-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .session-grid--tutor {
    grid-template-columns: 1fr 1fr;
  }
}

.session-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow-sm);
}

.session-card h2 {
  margin: 0 0 0.75rem;
  font-size: var(--step-3);
  color: var(--ink);
}

.session-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: var(--step-0);
  color: var(--muted);
  margin-bottom: 1rem;
}

.session-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--paper-2);
}

.session-pill--live {
  background: rgba(22, 163, 74, 0.12);
  color: #15803d;
}

.session-pill--off {
  background: var(--accent-faint);
  color: var(--accent);
}

.session-field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.session-field label {
  font-weight: 600;
  font-size: var(--step-0);
  color: var(--ink);
}

.session-field input,
.session-field select,
.session-field textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  font: inherit;
  background: var(--surface);
}

.session-field textarea {
  min-height: 5rem;
  resize: vertical;
}

.session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.session-btn {
  appearance: none;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
}

.session-btn:hover {
  background: var(--accent-hover);
}

.session-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.session-btn--ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.session-problem {
  font-size: var(--step-2);
  color: var(--ink);
  line-height: 1.5;
  margin: 0 0 1rem;
}

.session-feedback {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  margin-top: 0.75rem;
}

.session-feedback--ok {
  background: rgba(22, 163, 74, 0.12);
  color: #166534;
}

.session-feedback--bad {
  background: var(--accent-faint);
  color: var(--accent-hover);
}

.session-code {
  font-family: ui-monospace, monospace;
  font-size: var(--step-2);
  letter-spacing: 0.08em;
  color: var(--ink);
}

.session-meta {
  font-size: var(--step-0);
  color: var(--muted);
  margin-top: 0.5rem;
}

.session-error {
  color: var(--accent);
  font-size: var(--step-0);
  margin-top: 0.5rem;
}

.session-hidden {
  display: none !important;
}

/* —— Setup / join (centred card) —— */
.session-setup {
  max-width: 36rem;
  margin: 0 auto;
}

.session-header__tag {
  font-size: var(--step-0);
  color: var(--muted);
}

.session-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.session-voice {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.session-voice-btn {
  padding: 0.4rem 0.65rem;
  font-size: var(--step-0);
  border: 1px solid var(--border, #d1d5db);
  border-radius: 0.375rem;
  background: #fff;
  color: var(--text, #111827);
  cursor: pointer;
}

.session-voice-btn:hover {
  background: #f3f4f6;
}

.session-voice-btn.is-live {
  border-color: #059669;
  color: #047857;
}

.session-voice-btn.is-muted {
  border-color: #d97706;
  color: #b45309;
}

.session-voice-status {
  font-size: 0.75rem;
  color: #047857;
  white-space: nowrap;
}

.session-voice-status.is-connecting {
  color: #b45309;
}

#voice-remote {
  display: none;
}

.session-btn--danger {
  background: #b91c1c;
}

.session-btn--danger:hover {
  background: #991b1b;
}

.session-btn--compact {
  padding: 0.45rem 0.75rem;
  font-size: var(--step-0);
}

/* —— Live room: full-viewport whiteboard —— */
.session-page--live {
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

.session-page--live .session-header {
  flex-shrink: 0;
  padding: 0.45rem 1rem;
  position: relative;
  z-index: 600;
}

.session-page--live #session-countdown {
  display: none !important;
  pointer-events: none !important;
}

.session-page--live .session-header__inner {
  max-width: none;
}

.session-page--live .session-main {
  flex: 1;
  min-height: 0;
  max-width: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.session-room {
  position: relative;
  flex: 1;
  min-height: 0;
  width: 100%;
}

.session-page--live .session-stage {
  position: absolute;
  inset: 0;
  right: 2.75rem;
  min-height: 0;
  z-index: 1;
}

.session-page--live .session-board-wrap,
.session-page--live .session-share-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  border: none;
  border-radius: 0;
  box-shadow: none;
  background: #fff;
}

.session-page--live .session-board-frame,
.session-page--live .session-share-frame-host,
.session-page--live .session-share-frame {
  flex: 1;
  width: 100%;
  min-height: 0;
  height: 100%;
  border: 0;
}

.session-share-frame-host {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.session-share-frame-host[aria-hidden="true"] {
  display: none;
}

.session-share-frame-host .session-share-frame {
  flex: 1;
  width: 100%;
  min-height: 0;
  height: 100%;
  border: 0;
}

.session-share-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--paper);
}

.session-share-fallback__title {
  margin: 0;
  font-size: var(--step-3);
  color: var(--ink);
}

.session-share-fallback__note {
  margin: 0;
  max-width: 28rem;
  font-size: var(--step-1);
  color: var(--muted);
  line-height: 1.5;
}

.session-share-fallback__url {
  margin: 0;
  max-width: 100%;
  word-break: break-all;
}

.session-share-fallback__url a {
  color: var(--accent);
}

.session-view-toggle {
  display: inline-flex;
  gap: 0.25rem;
  padding: 0.2rem;
  border-radius: var(--radius-sm);
  background: var(--paper-2);
  border: 1px solid var(--line);
}

.session-view-toggle__btn {
  appearance: none;
  border: none;
  border-radius: calc(var(--radius-sm) - 2px);
  padding: 0.35rem 0.75rem;
  font: inherit;
  font-size: var(--step-0);
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--muted);
}

.session-view-toggle__btn.is-active {
  background: var(--accent);
  color: #fff;
}

.session-share-presets {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.session-share-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
}

.session-present-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #111;
}

.session-present-wrap--live .session-present-wait {
  display: none;
}

.session-present-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #111;
}

.session-present-wait {
  position: absolute;
  inset: auto 1.5rem 2rem;
  margin: 0;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.72);
  color: #fff;
  font-size: var(--step-1);
  text-align: center;
}

.session-page--live .session-present-wrap {
  z-index: 2;
}

.session-drawer--sites .session-drawer-tab {
  top: 62%;
}

/* —— Side drawers (pull tabs on the right) —— */
.session-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
}

.session-drawer-tab {
  position: fixed;
  right: 0;
  top: 50%;
  z-index: 201;
  transform: translateY(-50%);
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 7rem;
  width: 2.75rem;
  padding: 0.65rem 0.4rem;
  border: 1px solid var(--line-strong);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transition: right 0.28s ease;
}

.session-drawer-tab:hover {
  background: var(--accent-hover);
}

.session-drawer-tab__label {
  display: inline-block;
  transform: rotate(180deg);
}

.session-drawer-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  width: min(22rem, 92vw);
  transform: translateX(100%);
  transition: transform 0.28s ease;
  pointer-events: auto;
  overflow-y: auto;
  padding: 0.85rem 0.85rem 1.25rem;
  background: var(--paper);
  border-left: 1px solid var(--line-strong);
  box-shadow: -8px 0 28px rgba(0, 0, 0, 0.12);
  display: grid;
  gap: 0.85rem;
  align-content: start;
}

.session-drawer--open .session-drawer-panel {
  transform: translateX(0);
}

.session-drawer--open .session-drawer-tab {
  right: min(22rem, 92vw);
}

.session-drawer-panel .session-card {
  margin: 0;
}

.session-drawer-panel .session-meta a {
  word-break: break-all;
}

.session-page--live.session-drawers-open .session-board-frame,
.session-page--live.session-drawers-open .session-share-frame {
  pointer-events: none;
}

/* —— Session elapsed timer (header) —— */
.session-elapsed {
  font-variant-numeric: tabular-nums;
  font-size: var(--step-0);
  font-weight: 600;
  color: var(--ink);
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--paper-2);
  border: 1px solid var(--line);
}

/* —— Timetable / scheduler —— */
.session-setup-wide {
  max-width: 52rem;
}

.session-setup-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .session-setup-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

.session-schedule-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.session-schedule-item:last-child {
  border-bottom: none;
}

.session-schedule-item__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.session-schedule-link a {
  word-break: break-all;
}

.session-check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--step-0);
  cursor: pointer;
}

/* —— Full-screen pre-session countdown —— */
.session-countdown {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  text-align: center;
  color: #fff;
  background: radial-gradient(ellipse at 50% 30%, #1e3a5f 0%, #0b1220 55%, #05080f 100%);
  overflow: hidden;
}

.session-countdown::before {
  content: "";
  position: absolute;
  inset: -20%;
  background: conic-gradient(from 0deg, transparent, rgba(56, 189, 248, 0.08), transparent 35%);
  animation: session-countdown-spin 12s linear infinite;
  pointer-events: none;
}

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

.session-countdown__title {
  position: relative;
  margin: 0;
  font-family: var(--font-display, "Bebas Neue", sans-serif);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: 0.04em;
}

.session-countdown__label {
  position: relative;
  margin: 0;
  font-size: var(--step-1);
  opacity: 0.85;
}

.session-countdown__digits {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-display, "Bebas Neue", sans-serif);
  font-size: clamp(3rem, 14vw, 7rem);
  line-height: 1;
  letter-spacing: 0.06em;
}

.session-countdown__digits.is-ticking .session-countdown__num {
  animation: session-countdown-pulse 0.35s ease;
}

@keyframes session-countdown-pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.06);
    opacity: 0.92;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.session-countdown__sep {
  opacity: 0.55;
  animation: session-countdown-blink 1s step-end infinite;
}

@keyframes session-countdown-blink {
  50% {
    opacity: 0.2;
  }
}

.session-countdown--go {
  animation: session-countdown-flash 0.6s ease;
}

@keyframes session-countdown-flash {
  0% {
    filter: brightness(1);
  }
  40% {
    filter: brightness(1.35);
  }
  100% {
    filter: brightness(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .session-countdown::before {
    animation: none;
  }
  .session-countdown__digits.is-ticking .session-countdown__num {
    animation: none;
  }
  .session-countdown__sep {
    animation: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .session-drawer-panel,
  .session-drawer-tab {
    transition: none;
  }
}

.session-admin-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.session-admin-tabs {
  display: flex;
  gap: 0.5rem;
}

.session-admin-tabs__btn {
  font: inherit;
  font-size: var(--step-0);
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.session-admin-tabs__btn.is-active {
  background: var(--accent, #c45c26);
  border-color: transparent;
  color: #fff;
}

.session-field textarea {
  width: 100%;
  min-height: 4rem;
  font: inherit;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  resize: vertical;
}

.session-lobby {
  max-width: 32rem;
  margin: 0 auto;
}