/* Homepage agent (茜茜) — ported from ai-eng-studio TutorWidget/TutorAvatar */

.agent-fab {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  padding: 0;
  border: 1px solid var(--color-line, #d9d2c5);
  border-radius: 999px;
  background: var(--color-canvas, #f7f3ea);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--color-ink, #1c1915) 14%, transparent);
  cursor: pointer;
  transition: transform 160ms ease;
}

.agent-fab:hover {
  transform: scale(1.05);
}

.agent-panel {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 80;
  display: flex;
  flex-direction: column;
  width: min(92vw, 400px);
  height: min(70dvh, 540px);
  max-height: calc(100dvh - 3rem);
  overflow: hidden;
  border: 1px solid var(--color-line, #d9d2c5);
  border-radius: 1rem;
  background: var(--color-canvas, #f7f3ea);
  box-shadow: 0 18px 48px color-mix(in srgb, var(--color-ink, #1c1915) 18%, transparent);
  color: var(--color-ink, #1c1915);
}

.agent-panel[hidden],
.agent-fab[hidden] {
  display: none !important;
}

.agent-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-line, #d9d2c5);
  background: var(--color-paper, #fffdf8);
}

.agent-header__meta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.agent-header__text {
  min-width: 0;
}

.agent-header__title {
  font-family: var(--font-display, Georgia, serif);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
}

.agent-header__sub {
  overflow: hidden;
  color: var(--color-muted, #6f675c);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.agent-header__actions {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.agent-header__actions button {
  border: 0;
  background: transparent;
  color: var(--color-muted, #6f675c);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0.25rem 0.45rem;
  border-radius: 0.35rem;
}

.agent-header__actions button:hover {
  color: var(--color-ink, #1c1915);
}

.agent-body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.agent-empty {
  color: var(--color-muted, #6f675c);
  font-size: 0.84rem;
  line-height: 1.55;
}

.agent-empty p {
  margin: 0 0 0.65rem;
}

.agent-suggestion {
  display: block;
  width: 100%;
  margin: 0 0 0.4rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-line, #d9d2c5);
  border-radius: 0.55rem;
  background: var(--color-paper, #fffdf8);
  color: var(--color-ink, #1c1915);
  font: inherit;
  font-size: 0.82rem;
  text-align: left;
  cursor: pointer;
}

.agent-suggestion:hover {
  background: color-mix(in srgb, var(--color-paper, #fffdf8) 70%, var(--color-line, #d9d2c5));
}

.agent-row {
  display: flex;
}

.agent-row--user {
  justify-content: flex-end;
}

.agent-row--assistant {
  justify-content: flex-start;
}

.agent-row--tool_call,
.agent-row--tool_result {
  justify-content: flex-start;
}

/* Tool call: one short bubble — e.g. "🌐 WebSearch https://…" */
.agent-bubble--tool,
.agent-bubble--tool_call {
  max-width: 92%;
  padding: 0.5rem 0.75rem;
  border: 1px solid color-mix(in srgb, #5b8def 35%, var(--color-line, #d9d2c5));
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--color-paper, #fffdf8) 85%, #e8f0ff);
  box-shadow: 0 3px 12px color-mix(in srgb, var(--color-ink, #1c1915) 6%, transparent);
  color: var(--color-ink, #1c1915);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.4;
  word-break: break-word;
}

/* Intermediate / streaming assistant segments between tools */
.agent-bubble--streaming {
  opacity: 0.95;
  border-style: dashed;
}

.agent-col {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-width: 92%;
  min-width: 0;
}

.agent-process {
  max-width: 100%;
  border: 1px dashed color-mix(in srgb, var(--color-line, #d9d2c5) 85%, var(--color-muted, #6f675c));
  border-radius: 0.55rem;
  background: color-mix(in srgb, var(--color-paper, #fffdf8) 70%, var(--color-line, #d9d2c5));
  color: var(--color-muted, #6f675c);
  font-size: 0.72rem;
  line-height: 1.4;
}

.agent-process--live {
  border-style: solid;
  border-color: color-mix(in srgb, var(--color-accent, #8b6914) 35%, var(--color-line, #d9d2c5));
}

.agent-process > summary {
  cursor: pointer;
  list-style: none;
  padding: 0.35rem 0.55rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  user-select: none;
}

.agent-process > summary::-webkit-details-marker {
  display: none;
}

.agent-process > summary::before {
  content: "▸ ";
  opacity: 0.7;
}

.agent-process[open] > summary::before {
  content: "▾ ";
}

.agent-process__list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  max-height: 9.5rem;
  overflow: auto;
  padding: 0 0.55rem 0.45rem;
  border-top: 1px solid color-mix(in srgb, var(--color-line, #d9d2c5) 70%, transparent);
}

.agent-process__item {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  gap: 0.35rem;
  align-items: start;
}

.agent-process__tag {
  display: inline-block;
  margin-top: 0.12rem;
  padding: 0.05rem 0.28rem;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--color-ink, #1c1915) 8%, transparent);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-align: center;
}

.agent-process__item--thinking .agent-process__tag {
  background: color-mix(in srgb, #5b6abf 18%, transparent);
  color: #3d4a9a;
}

.agent-process__item--tool .agent-process__tag {
  background: color-mix(in srgb, #2e7d4f 16%, transparent);
  color: #1f5a38;
}

.agent-process__item--status .agent-process__tag {
  background: color-mix(in srgb, var(--color-accent, #8b6914) 16%, transparent);
  color: #6a5010;
}

.agent-process__text {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
  line-height: 1.4;
  color: var(--color-ink, #1c1915);
  opacity: 0.78;
}

[data-theme="dark"] .agent-process__item--thinking .agent-process__tag {
  color: #b7c0f5;
}

[data-theme="dark"] .agent-process__item--tool .agent-process__tag {
  color: #9fd4b4;
}

[data-theme="dark"] .agent-process__item--status .agent-process__tag {
  color: #e0c57a;
}

.agent-bubble {
  max-width: 88%;
  padding: 0.55rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 0.86rem;
  line-height: 1.55;
  word-break: break-word;
}

.agent-bubble--user {
  background: var(--color-ink, #1c1915);
  color: #fff;
  border-bottom-right-radius: 0.25rem;
}

.agent-bubble--assistant {
  background: var(--color-paper, #fffdf8);
  border: 1px solid var(--color-line, #d9d2c5);
  border-bottom-left-radius: 0.25rem;
}

.agent-bubble--assistant p {
  margin: 0 0 0.45rem;
}

.agent-bubble--assistant p:last-child {
  margin-bottom: 0;
}

.agent-bubble--assistant ul,
.agent-bubble--assistant ol {
  margin: 0.25rem 0 0.45rem;
  padding-left: 1.2rem;
}

.agent-bubble--assistant code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8em;
  padding: 0.05rem 0.3rem;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--color-line, #d9d2c5) 55%, transparent);
}

.agent-bubble--assistant a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.agent-error {
  padding: 0.55rem 0.75rem;
  border-radius: 0.55rem;
  background: color-mix(in srgb, #c62828 12%, var(--color-paper, #fffdf8));
  color: #b71c1c;
  font-size: 0.8rem;
}

.agent-form {
  border-top: 1px solid var(--color-line, #d9d2c5);
  background: var(--color-paper, #fffdf8);
  padding: 0.7rem 0.75rem;
}

.agent-form__row {
  display: flex;
  align-items: flex-end;
  gap: 0.45rem;
}

.agent-form textarea {
  flex: 1;
  min-height: 2.4rem;
  max-height: 7rem;
  resize: none;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-line, #d9d2c5);
  border-radius: 0.55rem;
  background: var(--color-canvas, #f7f3ea);
  color: inherit;
  font: inherit;
  font-size: 0.86rem;
  line-height: 1.4;
  outline: none;
}

.agent-form textarea:focus {
  border-color: color-mix(in srgb, var(--color-ink, #1c1915) 35%, var(--color-line, #d9d2c5));
}

.agent-form button {
  border: 1px solid var(--color-line, #d9d2c5);
  border-radius: 0.55rem;
  padding: 0.5rem 0.8rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  background: var(--color-ink, #1c1915);
  color: #fff;
}

.agent-form button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.agent-form button.agent-stop {
  background: transparent;
  color: var(--color-muted, #6f675c);
}

/* Avatar */
.tav-wrap {
  position: relative;
  flex-shrink: 0;
}

.tav-ring {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent, #8b6914) 55%, transparent);
}

.tav-frame {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 999px;
  border: 1px solid var(--color-line, #d9d2c5);
  background: color-mix(in srgb, var(--color-paper, #fffdf8) 80%, #fff);
}

.tav-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 50%;
  transform-origin: 50% 85%;
  will-change: transform;
  user-select: none;
  pointer-events: none;
}

.tav-status {
  position: absolute;
  border-radius: 999px;
  border: 2px solid var(--color-canvas, #f7f3ea);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-ink, #1c1915) 8%, transparent);
}

.tav-status--online { background: #00c853; }
.tav-status--offline { background: #ff1744; }
.tav-status--checking,
.tav-status--unknown { background: #ffbf00; }

.tav-overlay-dots {
  position: absolute;
  right: -0.15rem;
  top: -0.15rem;
  display: flex;
  gap: 0.12rem;
}

.tav-overlay-dots span {
  width: 0.28rem;
  height: 0.28rem;
  border-radius: 999px;
  background: var(--color-muted, #6f675c);
}

.tav-zzz {
  position: absolute;
  right: -0.1rem;
  top: -0.2rem;
  color: var(--color-muted, #6f675c);
  font-family: ui-monospace, monospace;
  pointer-events: none;
}

@keyframes tav-breathe {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-1.5%) scale(1.025); }
}
@keyframes tav-doze {
  0%, 100% { transform: translateY(0) rotate(-1.5deg); }
  50% { transform: translateY(2.5%) rotate(-1.5deg); }
}
@keyframes tav-pop {
  0% { transform: translateY(8%) scale(0.86); }
  60% { transform: translateY(-3%) scale(1.04); }
  100% { transform: translateY(0) scale(1); }
}
@keyframes tav-nod {
  0%, 100% { transform: rotate(-2deg) translateY(0); }
  50% { transform: rotate(2deg) translateY(-2%); }
}
@keyframes tav-tilt {
  0%, 100% { transform: rotate(-5deg) translateY(0); }
  50% { transform: rotate(-7deg) translateY(-1.5%); }
}
@keyframes tav-bounce {
  0% { transform: translateY(0) scale(1); }
  30% { transform: translateY(-12%) scale(1.06); }
  55% { transform: translateY(0) scale(0.98); }
  75% { transform: translateY(-5%) scale(1.02); }
  100% { transform: translateY(0) scale(1); }
}
@keyframes tav-shake {
  0%, 100% { transform: translateX(0) rotate(0); }
  20% { transform: translateX(-4%) rotate(-3deg); }
  40% { transform: translateX(3%) rotate(2deg); }
  60% { transform: translateX(-2%) rotate(-2deg); }
  80% { transform: translateX(2%) rotate(1deg); }
}
@keyframes tav-zzz {
  0% { opacity: 0; transform: translate(0, 0) scale(0.7); }
  30% { opacity: 1; }
  100% { opacity: 0; transform: translate(60%, -120%) scale(1.1); }
}
@keyframes tav-particle {
  0% { opacity: 0; transform: translate(0, 0) scale(0.4); }
  25% { opacity: 1; }
  100% { opacity: 0; transform: translate(var(--px, 0), -160%) scale(1); }
}
@keyframes tav-ring {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.05); }
}

.tav-sleeping { animation: tav-doze 4.2s ease-in-out infinite; }
.tav-idle { animation: tav-breathe 4.5s ease-in-out infinite; }
.tav-greeting { animation: tav-pop 700ms ease-out both, tav-breathe 4.5s ease-in-out 700ms infinite; }
.tav-listening { animation: tav-breathe 3s ease-in-out infinite; }
.tav-thinking { animation: tav-tilt 2.4s ease-in-out infinite; }
.tav-talking { animation: tav-nod 620ms ease-in-out infinite; }
.tav-happy { animation: tav-bounce 900ms ease-out both; }
.tav-confused { animation: tav-shake 700ms ease-in-out both; }

@media (prefers-reduced-motion: reduce) {
  .tav-sleeping, .tav-idle, .tav-greeting, .tav-listening,
  .tav-thinking, .tav-talking, .tav-happy, .tav-confused,
  .tav-ring { animation: none !important; }
}

html[data-theme="dark"] .agent-panel,
html[data-theme="dark"] .agent-fab {
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

@media (max-width: 640px) {
  .agent-fab {
    right: max(0.75rem, env(safe-area-inset-right, 0px));
    bottom: max(0.75rem, env(safe-area-inset-bottom, 0px));
    width: 3.1rem;
    height: 3.1rem;
  }

  /* Compact floating panel — smaller, fully on-screen, not full-bleed */
  .agent-panel {
    top: auto;
    left: auto;
    right: max(0.75rem, env(safe-area-inset-right, 0px));
    bottom: max(0.75rem, env(safe-area-inset-bottom, 0px));
    width: min(86vw, 320px);
    height: min(58dvh, 420px);
    max-height: calc(100dvh - 1.5rem - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px));
    border-radius: 0.85rem;
  }

  .agent-header {
    padding: 0.55rem 0.7rem;
  }

  .agent-header__title {
    font-size: 0.88rem;
  }

  .agent-header__sub {
    font-size: 0.6rem;
  }

  .agent-body {
    padding: 0.65rem 0.7rem;
    gap: 0.5rem;
  }

  .agent-empty {
    font-size: 0.78rem;
  }

  .agent-suggestion {
    padding: 0.45rem 0.6rem;
    font-size: 0.76rem;
  }

  .agent-bubble {
    max-width: 90%;
    padding: 0.45rem 0.65rem;
    font-size: 0.8rem;
  }

  .agent-form {
    padding: 0.5rem 0.55rem;
  }

  .agent-form textarea {
    min-height: 2.15rem;
    max-height: 4.5rem;
    padding: 0.4rem 0.55rem;
    font-size: 0.8rem;
  }

  .agent-form button {
    padding: 0.4rem 0.65rem;
    font-size: 0.76rem;
  }
}

/* Older browsers without dvh */
@supports not (height: 1dvh) {
  .agent-panel {
    height: min(70vh, 540px);
    max-height: calc(100vh - 3rem);
  }

  @media (max-width: 640px) {
    .agent-panel {
      height: min(58vh, 420px);
      max-height: calc(100vh - 1.5rem);
    }
  }
}