.eduai-tutor {
  position: fixed;
  z-index: 120;
  right: 18px;
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.eduai-tutor-launcher {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 16px;
  border: 0;
  border-radius: 999px;
  background: #0c6770;
  color: #fff;
  box-shadow: 0 12px 30px rgba(9, 52, 60, .28);
  font-weight: 800;
  cursor: pointer;
}

.eduai-tutor-launcher-icon { font-size: 18px; }

.eduai-tutor-panel {
  position: absolute;
  right: 0;
  bottom: 58px;
  display: flex;
  width: min(390px, calc(100vw - 24px));
  max-height: min(690px, calc(100vh - 100px));
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line, #d9e3e0);
  border-radius: 20px;
  background: var(--surface, #fff);
  color: var(--text, #17211f);
  box-shadow: 0 20px 55px rgba(10, 40, 44, .24);
}

.eduai-tutor-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 16px 13px;
  background: linear-gradient(135deg, #0b343d, #0b6971);
  color: #fff;
}

.eduai-tutor-header strong,
.eduai-tutor-header span { display: block; }
.eduai-tutor-header strong { font-size: 16px; }
.eduai-tutor-header span { margin-top: 3px; color: rgba(255,255,255,.72); font-size: 11px; }

.eduai-tutor-close {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 10px;
  background: rgba(255,255,255,.10);
  color: #fff;
  font-size: 23px;
  line-height: 1;
  cursor: pointer;
}

.eduai-tutor-notice {
  padding: 10px 13px;
  border-bottom: 1px solid var(--line, #d9e3e0);
  background: var(--surface-2, #f5f8f7);
  color: var(--muted, #61706d);
  font-size: 11px;
  line-height: 1.4;
}

.eduai-tutor-messages {
  display: flex;
  min-height: 170px;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding: 14px;
}

.eduai-tutor-message {
  max-width: 88%;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.eduai-tutor-message.is-assistant {
  align-self: flex-start;
  border: 1px solid var(--line, #d9e3e0);
  background: var(--surface-2, #f5f8f7);
}

.eduai-tutor-message.is-user {
  align-self: flex-end;
  background: #0c6770;
  color: #fff;
}

.eduai-tutor-message.is-pending { opacity: .7; }
.eduai-tutor-message.is-error { border-color: #a43c38; color: #a43c38; }

.eduai-tutor-suggestions {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0 12px 10px;
  scrollbar-width: none;
}
.eduai-tutor-suggestions::-webkit-scrollbar { display: none; }
.eduai-tutor-suggestions button {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid var(--line, #d9e3e0);
  border-radius: 999px;
  background: var(--surface, #fff);
  color: var(--primary, #0c6770);
  font-size: 11px;
  font-weight: 750;
  cursor: pointer;
}

.eduai-tutor-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 8px;
  padding: 10px 12px 8px;
  border-top: 1px solid var(--line, #d9e3e0);
}

.eduai-tutor-form textarea {
  width: 100%;
  min-height: 44px;
  max-height: 120px;
  resize: vertical;
  padding: 10px 11px;
  border: 1px solid var(--line, #d9e3e0);
  border-radius: 12px;
  background: var(--surface-2, #f5f8f7);
  color: var(--text, #17211f);
  font: inherit;
  font-size: 13px;
  line-height: 1.4;
}

.eduai-tutor-form textarea:focus { outline: 2px solid color-mix(in srgb, #0c6770 30%, transparent); border-color: #0c6770; }
.eduai-tutor-form button {
  min-height: 44px;
  padding: 0 13px;
  border: 0;
  border-radius: 12px;
  background: #0c6770;
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}
.eduai-tutor-form button:disabled { opacity: .55; cursor: wait; }

.eduai-tutor-foot {
  padding: 0 13px 11px;
  color: var(--muted, #61706d);
  font-size: 10px;
  line-height: 1.35;
}

.eduai-tutor-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 540px) {
  .eduai-tutor { right: 12px; bottom: calc(12px + env(safe-area-inset-bottom, 0px)); }
  .eduai-tutor-panel {
    position: fixed;
    right: 8px;
    bottom: calc(72px + env(safe-area-inset-bottom, 0px));
    left: 8px;
    width: auto;
    max-height: calc(100vh - 92px - env(safe-area-inset-bottom, 0px));
  }
}

@media print {
  .eduai-tutor { display: none !important; }
}