.ai-tutor {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 1250;
  font-family: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
}

.ai-tutor-toggle {
  width: 64px;
  height: 64px;
  border: 0;
  border-radius: 50%;
  color: #ffffff;
  background: linear-gradient(135deg, #111827, #ff6f00);
  box-shadow: 0 18px 34px rgba(17,24,39,0.28);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-weight: 900;
  letter-spacing: 0;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.ai-tutor-toggle span {
  font-size: 1rem;
  line-height: 1;
}

.ai-tutor-toggle i {
  margin: 0;
  font-size: 0.95rem;
}

.ai-tutor-toggle:hover,
.ai-tutor-toggle:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 22px 42px rgba(17,24,39,0.34);
  outline: none;
}

.ai-tutor-panel {
  position: absolute;
  right: 0;
  bottom: 78px;
  width: min(380px, calc(100vw - 2rem));
  max-height: min(640px, calc(100vh - 7rem));
  display: grid;
  grid-template-rows: auto minmax(180px, 1fr) auto auto;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.12);
  background: #f8fafc;
  box-shadow: 0 24px 70px rgba(15,23,42,0.34);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px) scale(0.96);
  transition: opacity 180ms ease, visibility 180ms ease, transform 180ms ease;
}

.ai-tutor.is-open .ai-tutor-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
}

.ai-tutor-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  color: #ffffff;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(255,111,0,0.38), transparent 42%),
    linear-gradient(135deg, #0f172a, #111827);
}

.ai-tutor-kicker {
  margin: 0 0 0.25rem;
  color: #ffb15c;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ai-tutor-header h2 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.ai-tutor-header p {
  margin: 0.25rem 0 0;
  color: rgba(255,255,255,0.78);
  font-size: 0.82rem;
  line-height: 1.45;
}

.ai-tutor-close {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  color: #ffffff;
  cursor: pointer;
}

.ai-tutor-close i {
  margin: 0;
}

.ai-tutor-messages {
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background:
    linear-gradient(rgba(15,23,42,0.04) 1px, transparent 1px),
    #f8fafc;
  background-size: 28px 28px;
}

.ai-tutor-message {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  max-width: 88%;
}

.ai-tutor-message.user {
  align-self: flex-end;
  align-items: flex-end;
}

.ai-tutor-message.bot {
  align-self: flex-start;
}

.ai-tutor-bubble {
  padding: 0.72rem 0.82rem;
  border-radius: 14px;
  font-size: 0.9rem;
  line-height: 1.55;
  box-shadow: 0 8px 20px rgba(15,23,42,0.08);
}

.ai-tutor-message.user .ai-tutor-bubble {
  color: #ffffff;
  background: linear-gradient(135deg, #111827, #334155);
  border-bottom-right-radius: 4px;
}

.ai-tutor-message.bot .ai-tutor-bubble {
  color: #1f2937;
  background: #ffffff;
  border: 1px solid rgba(15,23,42,0.10);
  border-bottom-left-radius: 4px;
}

.ai-tutor-meta {
  color: #64748b;
  font-size: 0.72rem;
  font-weight: 800;
}

.ai-tutor-quick {
  display: flex;
  gap: 0.45rem;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  border-top: 1px solid rgba(15,23,42,0.08);
  background: #ffffff;
}

.ai-tutor-chip {
  flex: 0 0 auto;
  min-height: 36px;
  border: 1px solid rgba(255,111,0,0.22);
  border-radius: 999px;
  background: rgba(255,111,0,0.08);
  color: #9a3412;
  padding: 0.45rem 0.72rem;
  font-size: 0.8rem;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
}

.ai-tutor-chip:hover,
.ai-tutor-chip:focus-visible {
  background: rgba(255,111,0,0.16);
  outline: none;
}

.ai-tutor-form {
  display: grid;
  grid-template-columns: 1fr 46px;
  gap: 0.55rem;
  padding: 0.8rem;
  border-top: 1px solid rgba(15,23,42,0.08);
  background: #ffffff;
}

.ai-tutor-form input {
  width: 100%;
  min-height: 46px;
  border: 1.5px solid rgba(15,23,42,0.14);
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
  color: #111827;
  background: #f8fafc;
  font: inherit;
  outline: none;
}

.ai-tutor-form input:focus {
  border-color: rgba(255,111,0,0.72);
  box-shadow: 0 0 0 4px rgba(255,111,0,0.12);
}

.ai-tutor-form button {
  min-height: 46px;
  border: 0;
  border-radius: 12px;
  color: #ffffff;
  background: linear-gradient(135deg, #111827, #ff6f00);
  cursor: pointer;
}

.ai-tutor-form button i {
  margin: 0;
}

.ai-tutor-info {
  padding-top: 0;
}

.ai-tutor-info-card {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 1rem;
  align-items: start;
}

.ai-tutor-info-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #ffffff;
  background: linear-gradient(135deg, #111827, #ff6f00);
  box-shadow: 0 14px 28px rgba(17,24,39,0.18);
}

.ai-tutor-info-icon i {
  margin: 0;
  font-size: 1.35rem;
}

.ai-tutor-info-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.8;
}

@media (max-width: 600px) {
  .ai-tutor {
    right: 0.8rem;
    bottom: 0.8rem;
  }

  .ai-tutor-toggle {
    width: 58px;
    height: 58px;
  }

  .ai-tutor-panel {
    right: -0.2rem;
    bottom: 70px;
    width: calc(100vw - 1.2rem);
    max-height: calc(100vh - 6rem);
    border-radius: 14px;
  }

  .ai-tutor-info-card {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-tutor-toggle,
  .ai-tutor-panel {
    transition: none;
  }
}