body {
  --status-font: "IBM Plex Mono", monospace;
  padding-block: 0;
  padding-inline: clamp(0px, 2vw, 24px);
}

.chat-page {
  box-sizing: border-box;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  max-width: 1100px;
  padding-bottom: var(--ai-chat-composer-clearance, 234px);
}

.chat-back-link {
  display: inline-block;
  margin-bottom: 16px;
}

.ai-chat-status {
  display: inline-flex;
  width: fit-content;
  min-height: 34px;
  align-items: center;
  gap: 7px;
  box-sizing: border-box;
  padding: 6px 12px;
  border: 1px solid #cbdce8;
  border-radius: 999px;
  background: #f5f9fc;
  color: #476b85;
}

.ai-chat-status::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #6c99b7;
  box-shadow: 0 0 7px rgb(108 153 183 / 45%);
  content: "";
}

.ai-chat-status[data-state="checking"],
.ai-chat-status[data-state="loading"] {
  border-color: #ead9a7;
  background: #fff9e9;
  color: #80651f;
}

.ai-chat-status[data-state="checking"]::before,
.ai-chat-status[data-state="loading"]::before {
  background: #c69b2d;
}

.ai-chat-status[data-state="error"] {
  border-color: #e7ccc6;
  background: #fff6f4;
  color: #874b42;
}

.ai-chat-status[data-state="error"]::before {
  background: #b5695d;
}

.paper-note.ai-chat {
  border-top: 0;
  border-bottom: 0;
  border-radius: 0;
  background: #fff;
  box-shadow: 0 0 24px rgb(83 104 120 / 8%);
  font-family: var(--status-font);
}

.ai-chat-model-controls {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.ai-chat-model-controls + .ai-chat-status {
  margin-top: 12px;
}

.ai-chat-model-picker {
  display: flex;
  gap: 10px;
}

.ai-chat-model-picker select {
  min-width: 0;
  flex: 1;
}

.ai-chat-model-picker button:disabled {
  border-color: rgb(138 146 152 / 25%);
  background: #eef0f1;
  color: #8a9298;
  box-shadow: none;
  cursor: not-allowed;
  opacity: 1;
}

.ai-chat-model-status {
  display: flex;
  width: fit-content;
  min-height: 34px;
  align-items: center;
  gap: 8px;
  box-sizing: border-box;
  padding: 6px 12px;
  border: 1px solid #cbdce8;
  border-radius: 999px;
  background: #f5f9fc;
  color: #526b80;
}

.ai-chat-model-status[data-state="checking"] {
  border-color: #ead9a7;
  background: #fff9e9;
  color: #80651f;
}

.ai-chat-model-status[data-state="loaded"] {
  border-color: #cdddc8;
  background: #f2f8f1;
  color: #46613e;
}

.ai-chat-model-status[data-state="error"] {
  border-color: #e7ccc6;
  background: #fff6f4;
  color: #874b42;
}

.loading-spinner {
  box-sizing: border-box;
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
  border: 2px solid #bccfdd;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: loading-spinner-spin .8s linear infinite;
}

.loading-spinner[hidden] {
  display: none;
}

.ai-chat-messages {
  margin: 12px 0;
  padding: 4px;
  overflow-wrap: anywhere;
}

.ai-chat-message {
  display: grid;
  gap: 6px;
}

.ai-chat-message + .ai-chat-message {
  margin-top: 16px;
}

.ai-chat-user {
  justify-items: end;
}

.ai-chat-message > strong {
  display: block;
  margin-bottom: 6px;
  color: #354f65;
  font-size: .875rem;
}

.ai-chat-message-bubble {
  width: fit-content;
  max-width: 88%;
  padding: 12px 14px;
  border: 1px solid #e1e7eb;
  border-radius: 10px;
  background: #fff;
  color: #2f2b25;
  line-height: 1.65;
  white-space: pre-wrap;
  box-shadow: 0 3px 10px rgb(83 104 120 / 8%);
}

.ai-chat-user .ai-chat-message-bubble {
  border-color: #c9dbe7;
  background: linear-gradient(135deg, #f3f8fb, #e8f1f7);
}

.ai-chat-markdown {
  white-space: normal;
}

.ai-chat-markdown > * + * {
  margin-top: 12px;
}

.ai-chat-markdown pre {
  overflow: auto;
  padding: 12px;
  background: #e2e8ed;
  border-radius: 4px;
}

.ai-chat-markdown img {
  max-width: 100%;
}

.ai-chat-form {
  position: fixed;
  z-index: 1;
  bottom: 0;
  left: 50%;
  display: grid;
  box-sizing: border-box;
  width: calc(100% - clamp(0px, 4vw, 48px));
  max-width: 1100px;
  gap: 8px;
  padding: 12px clamp(18px, 3vw, 32px) 18px;
  background: #fff;
  box-shadow: 0 -8px 18px rgb(83 104 120 / 6%);
  transform: translateX(-50%);
}

.ai-chat-form textarea,
.ai-chat-model-picker select {
  box-sizing: border-box;
  width: 100%;
  padding: 10px;
  border: 1px solid #cbd6de;
  border-radius: 6px;
  background: #fff;
  color: inherit;
  font: inherit;
  resize: vertical;
}

.ai-chat-form textarea:focus-visible,
.ai-chat-model-picker select:focus-visible {
  outline: 2px solid #7896ad;
  outline-offset: 2px;
}

.ai-chat-model-controls > label,
.ai-chat-form > label,
.ai-chat-status,
.ai-chat-model-status,
.ai-chat-model-picker :is(select, button) {
  font-family: var(--status-font);
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .02em;
}

.site-dialog {
  max-width: min(420px, calc(100% - 32px));
  padding: 20px;
  border: 1px solid #dbe2d7;
  border-radius: 8px;
  background: #fffefa;
  color: #352f27;
  box-shadow: 0 12px 32px rgb(53 47 39 / 18%);
  font-family: var(--status-font);
}

.site-dialog::backdrop {
  background: rgb(53 47 39 / 30%);
}

.site-dialog h2 {
  margin: 0 0 12px;
}

.site-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.ai-chat-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.ai-chat-actions [hidden] {
  display: none;
}

.ai-chat-actions button:disabled {
  opacity: .6;
  cursor: wait;
}

.ai-chat-typing-dots {
  display: inline-flex;
  gap: 5px;
  padding: 8px 0;
}

.ai-chat-typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #657e94;
  animation: ai-chat-dot 1.2s ease-in-out infinite;
}

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

@keyframes ai-chat-dot {
  0%, 100% { opacity: .35; }
  50% { opacity: 1; }
}

@keyframes loading-spinner-spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 540px) {
  body {
    padding-inline: 0;
  }

  .ai-chat-form {
    width: 100%;
  }

  .ai-chat-model-picker {
    align-items: stretch;
    flex-direction: column;
  }

  .ai-chat-message-bubble {
    max-width: 94%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-chat-typing-dots span,
  .loading-spinner { animation: none; }
}