:root {
  --ai-panel-width: 720px;
}

.ai-tutor-overlay,
.ai-tutor-overlay.is-visible,
.ai-overlay,
.ai-backdrop,
.tutor-overlay,
.tutor-backdrop,
#aiTutorOverlay,
#thiasosAiOverlay,
#thiasosAiBackdrop,
.ai-tutor-suggestions {
  display: none !important;
}

.ai-tutor-fab {
  position: fixed;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

.ai-tutor-panel {
  position: fixed;
  inset: 50% auto auto 50%;
  z-index: 120;
  width: min(94vw, var(--ai-panel-width));
  max-height: min(86vh, 760px);
  display: none;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  overflow: hidden;
  transform: translate(-50%, -50%);
  border: 1px solid var(--colors-border-soft, #DED6CB);
  border-radius: var(--layout-border-radius-lg, 22px);
  background: var(--colors-background-surface, #F4F3EF);
  color: var(--colors-text-primary, #24191B);
  box-shadow: var(--layout-shadow-medium, 0 18px 46px rgba(74, 18, 29, .14));
}

.ai-tutor-panel.is-open {
  display: grid;
}

.ai-tutor-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--colors-border-soft, #DED6CB);
  background: var(--colors-background-brand-area, #F4F3EF);
}

.ai-tutor-panel__brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.ai-tutor-orb,
.ai-thinking-mini-orb {
  flex: 0 0 auto;
  border-radius: var(--layout-border-radius-pill, 999px);
  background:
    radial-gradient(circle at 32% 24%,
      var(--colors-background-surface-warm, #FAF8F3) 0,
      var(--colors-brand-secondary-soft, #D8C49A) 30%,
      var(--colors-brand-secondary, #B99A5B) 54%,
      var(--colors-brand-primary, #692530) 84%);
}

.ai-tutor-orb {
  width: 42px;
  height: 42px;
  box-shadow: 0 0 22px color-mix(in srgb, var(--colors-brand-secondary, #B99A5B) 45%, transparent);
}

.ai-thinking-mini-orb {
  width: 22px;
  height: 22px;
}

.ai-tutor-panel.is-thinking .ai-tutor-orb,
.ai-tutor-panel.is-listening .ai-tutor-orb {
  animation: aiOrbBreathe 1.25s infinite ease-in-out;
}

@keyframes aiOrbBreathe {
  0%, 100% { transform: scale(.96); }
  50% { transform: scale(1.04); }
}

.ai-tutor-panel__eyebrow,
.ai-tutor-panel__hint,
.ai-voice-status,
.ai-attachment {
  margin: 0;
  color: var(--colors-text-secondary, #6F6260);
}

.ai-tutor-panel__eyebrow {
  font-size: var(--typography-sizes-xs, .75rem);
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.ai-tutor-panel h2 {
  margin: 0;
  color: var(--colors-brand-primary, #692530);
  font-family: var(--typography-families-heading, Georgia, serif);
  font-size: var(--typography-sizes-xl, 1.5rem);
  line-height: 1.1;
}

.ai-tutor-panel__hint {
  margin-top: 3px;
  font-size: var(--typography-sizes-sm, .875rem);
  line-height: 1.35;
}

.ai-tutor-panel__tools {
  display: flex;
  gap: 6px;
}

.ai-tutor-panel__tool,
.ai-tutor-panel__close,
.ai-tutor-icon-button {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--colors-border-soft, #DED6CB);
  border-radius: var(--layout-border-radius-pill, 999px);
  background: var(--colors-background-surface, #F4F3EF);
  color: var(--colors-brand-primary, #692530);
}

.ai-tutor-panel__messages {
  min-height: 280px;
  overflow: auto;
  padding: 18px;
  background: var(--colors-background-study-area, #D9D0C3);
}

.ai-message {
  display: flex;
  margin-bottom: 12px;
}

.ai-message--user {
  justify-content: flex-end;
}

.ai-message--assistant {
  justify-content: flex-start;
}

.ai-message__bubble {
  max-width: min(92%, 580px);
  padding: 12px 14px;
  border-radius: var(--layout-border-radius-md, 14px);
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.ai-message--assistant .ai-message__bubble {
  border: 1px solid var(--colors-border-soft, #DED6CB);
  background: var(--colors-background-surface, #F4F3EF);
}

.ai-message--user .ai-message__bubble {
  background: var(--colors-brand-primary, #692530);
  color: var(--colors-text-inverse, #F4F3EF);
}

.ai-thinking-row,
.ai-tutor-panel__actions,
.ai-attachment {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-thinking-dots {
  display: inline-flex;
  gap: 4px;
}

.ai-thinking-dots span {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--colors-brand-primary, #692530);
  animation: aiPulse 1s infinite ease-in-out;
}

.ai-thinking-dots span:nth-child(2) { animation-delay: .15s; }
.ai-thinking-dots span:nth-child(3) { animation-delay: .3s; }

@keyframes aiPulse {
  0%, 80%, 100% { opacity: .35; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

.ai-tutor-panel__attachments {
  display: grid;
  gap: 8px;
  padding: 0 18px;
  background: var(--colors-background-brand-area, #F4F3EF);
}

.ai-attachment {
  justify-content: space-between;
  margin-top: 12px;
  padding: 9px 10px;
  border: 1px solid var(--colors-border-soft, #DED6CB);
  border-radius: var(--layout-border-radius-md, 14px);
  background: var(--colors-background-surface-warm, #FAF8F3);
  font-size: var(--typography-sizes-sm, .875rem);
}

.ai-attachment button {
  border: 0;
  background: transparent;
  color: var(--colors-brand-primary, #692530);
  font-weight: 800;
}

.ai-tutor-panel__form {
  display: grid;
  gap: 10px;
  padding: 14px 18px 18px;
  border-top: 1px solid var(--colors-border-soft, #DED6CB);
  background: var(--colors-background-brand-area, #F4F3EF);
}

.ai-voice-status {
  display: none;
  font-size: var(--typography-sizes-sm, .875rem);
  font-weight: 800;
}

.ai-voice-status.is-visible {
  display: block;
}

.ai-tutor-panel__form textarea {
  width: 100%;
  min-height: 54px;
  max-height: 128px;
  resize: vertical;
  padding: 12px 13px;
  border: 1px solid var(--colors-border-default, #CBBEAF);
  border-radius: var(--layout-border-radius-md, 14px);
  background: var(--colors-background-surface, #F4F3EF);
  color: var(--colors-text-primary, #24191B);
}

.ai-tutor-panel__form textarea:focus {
  border-color: var(--colors-brand-primary, #692530);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--colors-brand-primary, #692530) 14%, transparent);
}

.ai-tutor-panel__actions {
  justify-content: flex-end;
}

.ai-tutor-send {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--colors-brand-primary, #692530);
  border-radius: var(--layout-border-radius-pill, 999px);
  background: var(--colors-brand-primary, #692530);
  color: var(--colors-text-inverse, #F4F3EF);
  font-weight: 800;
}

.ai-tutor-send:disabled {
  opacity: .65;
  cursor: wait;
}

.ai-tutor-icon-button.is-recording {
  background: var(--colors-status-error, #B7474A);
  color: #fff;
}

@media (max-width: 680px) {
  .ai-tutor-panel {
    width: min(94vw, 720px);
    max-height: 82vh;
  }

  .ai-tutor-panel__header {
    padding: 14px;
  }

  .ai-tutor-orb {
    width: 34px;
    height: 34px;
  }

  .ai-tutor-panel__messages {
    min-height: 220px;
    padding: 14px;
  }

  .ai-message__bubble {
    max-width: 94%;
  }
}