/* ai-ask.css — AI ask widget styles
 * Navbar-anchored trigger + native <dialog> centered modal.
 * BEM-style classes prefixed with `aia-` to avoid clashing with Quarto/Bootstrap.
 * Tokens auto-track Quarto's [data-bs-theme="dark"] toggle.
 */

/* ---------- 1. Design tokens ---------- */
:root {
  --aia-surface:           rgba(255, 255, 255, 0.92);
  --aia-surface-elevated:  #ffffff;
  --aia-surface-muted:     #f4f6f8;
  --aia-backdrop:          rgba(15, 20, 28, 0.18);
  --aia-backdrop-blur:     2px;

  --aia-ink:               #1a1d22;
  --aia-ink-soft:          #4a5160;
  /* Round 2: bumped from #8a92a3 → #6b7280 for ~5:1 contrast on #fff */
  --aia-ink-muted:         #6b7280;

  /* Round 2: warning rail token */
  --aia-warn-rail:         #d99820;
  --aia-warn-icon:         url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path d='M8 1.5L.8 14h14.4L8 1.5zm0 4.7v3.6m0 1.6v.8' fill='none' stroke='%23b8860b' stroke-width='1.4' stroke-linecap='round'/></svg>");

  --aia-accent:            var(--bs-primary, #2780e3);
  --aia-accent-soft:       color-mix(in srgb, var(--aia-accent) 10%, transparent);
  --aia-accent-ring:       color-mix(in srgb, var(--aia-accent) 28%, transparent);
  --aia-on-accent:         #ffffff;

  --aia-border:            rgba(15, 20, 28, 0.08);
  --aia-border-strong:     rgba(15, 20, 28, 0.16);

  --aia-shadow-modal:      0 24px 64px -16px rgba(15, 20, 28, 0.32),
                           0 8px 24px -8px rgba(15, 20, 28, 0.18);

  --aia-radius-modal:      16px;
  --aia-radius-bubble:     12px;
  --aia-radius-input:      10px;
  --aia-radius-chip:       999px;

  --aia-font-ui:           -apple-system, BlinkMacSystemFont, "Segoe UI",
                           "PingFang SC", "Hiragino Sans GB",
                           "Microsoft YaHei", "Noto Sans CJK SC",
                           Roboto, Helvetica, Arial, sans-serif;
  --aia-font-mono:         ui-monospace, SFMono-Regular, "SF Mono",
                           Menlo, Consolas, "Liberation Mono", monospace;

  --aia-ease-out:          cubic-bezier(0.22, 1, 0.36, 1);
  --aia-ease-inout:        cubic-bezier(0.65, 0, 0.35, 1);
  --aia-dur-fast:          160ms;
  --aia-dur-base:          240ms;
  --aia-dur-slow:          320ms;
}

[data-bs-theme="dark"] {
  --aia-surface:           rgba(28, 32, 38, 0.92);
  --aia-surface-elevated:  #23282f;
  --aia-surface-muted:     #2a2e34;
  --aia-backdrop:          rgba(0, 0, 0, 0.32);

  --aia-ink:               #e8eaed;
  --aia-ink-soft:          #b6bcc7;
  /* Round 2: bumped from #828a96 → #9ba3b0 for ~4.7:1 contrast on dark surface */
  --aia-ink-muted:         #9ba3b0;

  /* R2-P2-2: lighten accent in dark mode for AA contrast on dark surface */
  --aia-accent:            color-mix(in srgb, var(--bs-primary, #2780e3) 70%, white 30%);
  --aia-accent-soft:       color-mix(in srgb, var(--aia-accent) 18%, transparent);
  --aia-accent-ring:       color-mix(in srgb, var(--aia-accent) 36%, transparent);

  --aia-border:            rgba(255, 255, 255, 0.08);
  --aia-border-strong:     rgba(255, 255, 255, 0.16);

  --aia-shadow-modal:      0 24px 64px -16px rgba(0, 0, 0, 0.6),
                           0 8px 24px -8px rgba(0, 0, 0, 0.4);
}

/* ---------- 2. Trigger pill ---------- */
.aia-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.32rem 0.7rem 0.32rem 0.55rem;
  margin: 0 0.4rem;
  font: 500 0.86rem/1 var(--aia-font-ui);
  color: var(--aia-ink-soft);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--aia-radius-chip);
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              background var(--aia-dur-fast) var(--aia-ease-out),
              border-color var(--aia-dur-fast) var(--aia-ease-out),
              transform var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-trigger:hover {
  color: var(--aia-accent);
  background: var(--aia-accent-soft);
  border-color: var(--aia-accent-ring);
  transform: translateY(-1px);
}

.aia-trigger:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--aia-accent-ring);
}

.aia-trigger__icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.aia-trigger__label {
  white-space: nowrap;
}

.aia-trigger__kbd {
  display: inline-flex;
  align-items: center;
  padding: 1px 5px;
  font: 600 0.72rem/1 var(--aia-font-mono);
  color: var(--aia-ink-muted);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: 4px;
}

/* Floating placement — fixed bottom-right FAB pill on every page */
.aia-trigger--floating {
  position: fixed;
  bottom: 28px;
  right: 28px;
  top: auto;
  left: auto;
  z-index: 1040;
  gap: 0.6rem;
  padding: 0.85rem 1.35rem 0.85rem 1.1rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--aia-accent);
  background: var(--aia-surface-elevated);
  border: 1px solid var(--aia-border);
  border-radius: 999px;
  box-shadow: 0 12px 28px rgba(15, 20, 28, 0.18),
              0 4px 12px rgba(15, 20, 28, 0.10);
}

.aia-trigger--floating:hover {
  color: var(--aia-accent);
  background: var(--aia-surface-elevated);
  border-color: var(--aia-accent-ring);
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(15, 20, 28, 0.22),
              0 6px 14px rgba(15, 20, 28, 0.12);
}

.aia-trigger--floating .aia-trigger__icon {
  width: 22px;
  height: 22px;
}

.aia-trigger--floating .aia-trigger__kbd {
  font-size: 0.78rem;
  padding: 2px 7px;
}

@media (max-width: 575.98px) {
  .aia-trigger--floating {
    bottom: 18px;
    right: 18px;
    width: 56px;
    height: 56px;
    padding: 0;
    justify-content: center;
  }
  .aia-trigger--floating .aia-trigger__icon { width: 26px; height: 26px; }
  .aia-trigger--floating .aia-trigger__label,
  .aia-trigger--floating .aia-trigger__kbd { display: none; }
}

/* ---------- 3. Modal (native <dialog>) ---------- */
.aia-modal {
  width: min(820px, calc(100vw - 48px));
  max-width: none;
  /* fallback (vh) */
  height: min(820px, calc(100vh - 120px));
  max-height: min(820px, calc(100vh - 120px));
  padding: 0;
  /* margin-top: 6vh shifts the modal upward from default vertical-center,
     so the input area lands closer to the reader's natural eye line. */
  margin: 6vh auto auto auto;
  color: var(--aia-ink);
  background: var(--aia-surface);
  border: 1px solid var(--aia-border);
  border-radius: var(--aia-radius-modal);
  box-shadow: var(--aia-shadow-modal);
  font-family: var(--aia-font-ui);
  overflow: hidden;
}

/* Round 2: dvh-aware sizing — avoids mobile Safari URL-bar clipping */
@supports (height: 100dvh) {
  .aia-modal {
    height: min(820px, calc(100dvh - 120px));
    max-height: min(820px, calc(100dvh - 120px));
  }
}

/* Closed dialog fully removed from layout */
.aia-modal:not([open]) {
  display: none;
}

/* Entry animation */
.aia-modal[open] {
  animation: aia-modal-in var(--aia-dur-base) var(--aia-ease-out);
}

@keyframes aia-modal-in {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

.aia-modal::backdrop {
  background: var(--aia-backdrop);
  -webkit-backdrop-filter: blur(var(--aia-backdrop-blur));
  backdrop-filter: blur(var(--aia-backdrop-blur));
  animation: aia-backdrop-in var(--aia-dur-base) var(--aia-ease-out);
}

@keyframes aia-backdrop-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.aia-modal__inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  max-height: inherit;
}

/* ---------- 4. Header ---------- */
.aia-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--aia-border);
  /* Round 2: editorial paper-warmth wash; 4% accent in light, 7% in dark */
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--aia-accent) 4%, transparent) 0%,
    transparent 70%);
}

[data-bs-theme="dark"] .aia-header {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--aia-accent) 7%, transparent) 0%,
    transparent 70%);
}

.aia-header__title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--aia-ink);
  letter-spacing: 0.01em;
  flex: 0 0 auto;
}

.aia-header__chip {
  flex: 1 1 auto;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  min-width: 0;
  padding: 0.25rem 0.6rem;
  font: 400 0.78rem/1.3 var(--aia-font-ui);
  color: var(--aia-ink-soft);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: var(--aia-radius-chip);
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              border-color var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-header__chip:hover {
  color: var(--aia-accent);
  border-color: var(--aia-accent-ring);
}

.aia-header__chip-text {
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.aia-header__actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: 0 0 auto;
}

.aia-newchat,
.aia-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  color: var(--aia-ink-soft);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              background var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-newchat:hover,
.aia-close:hover {
  color: var(--aia-ink);
  background: var(--aia-surface-muted);
}

.aia-newchat:focus-visible,
.aia-close:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--aia-accent-ring);
}

/* ---------- 5. Body / messages ---------- */
.aia-body {
  flex: 1 1 auto;
  /* Round 2: min-height:0 lets flex shrink the body so composer stays pinned */
  min-height: 0;
  overflow-y: auto;
  padding: 1rem 1.1rem;
  font-size: 0.93rem;
  line-height: 1.62;
  color: var(--aia-ink);
  scrollbar-width: thin;
  scrollbar-color: var(--aia-border-strong) transparent;
}

.aia-body::-webkit-scrollbar { width: 8px; }
.aia-body::-webkit-scrollbar-track { background: transparent; }
.aia-body::-webkit-scrollbar-thumb {
  background: var(--aia-border-strong);
  border-radius: 4px;
}

.aia-msg {
  max-width: 92%;
  margin: 0.55rem 0;
  padding: 0.65rem 0.85rem;
  border-radius: var(--aia-radius-bubble);
  word-wrap: break-word;
  overflow-wrap: anywhere;
  animation: aia-msg-in var(--aia-dur-base) var(--aia-ease-out);
}

@keyframes aia-msg-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.aia-msg p { margin: 0 0 0.45rem; }
.aia-msg p:last-child { margin-bottom: 0; }

.aia-msg pre {
  position: relative;
  margin: 0.5rem 0;
  padding: 0.7rem 0.8rem;
  font: 0.84rem/1.55 var(--aia-font-mono);
  color: var(--aia-ink);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: 8px;
  overflow-x: auto;
}

.aia-msg code {
  padding: 0.05em 0.35em;
  font: 0.88em/1.4 var(--aia-font-mono);
  background: var(--aia-surface-muted);
  border-radius: 4px;
}

.aia-msg pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
}

/* Marked.js GFM output: tables, lists, headings, blockquotes */
.aia-msg h1, .aia-msg h2, .aia-msg h3,
.aia-msg h4, .aia-msg h5, .aia-msg h6 {
  margin: 0.7rem 0 0.35rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--aia-ink);
}
.aia-msg h1 { font-size: 1.18rem; }
.aia-msg h2 { font-size: 1.08rem; }
.aia-msg h3 { font-size: 1.0rem; }
.aia-msg h4, .aia-msg h5, .aia-msg h6 { font-size: 0.95rem; }

.aia-msg ul, .aia-msg ol {
  margin: 0.45rem 0 0.55rem;
  padding-left: 1.4rem;
}
.aia-msg li { margin: 0.15rem 0; }
.aia-msg li > p { margin: 0.15rem 0; }

.aia-msg blockquote {
  margin: 0.55rem 0;
  padding: 0.4rem 0.85rem;
  border-left: 3px solid var(--aia-accent-ring);
  background: var(--aia-accent-soft);
  color: var(--aia-ink-soft);
  border-radius: 4px;
}
.aia-msg blockquote p:last-child { margin-bottom: 0; }

.aia-msg table {
  display: block;
  overflow-x: auto;
  width: 100%;
  margin: 0.6rem 0;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.aia-msg table th,
.aia-msg table td {
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--aia-border);
  text-align: left;
  vertical-align: top;
}
.aia-msg table th {
  background: var(--aia-surface-muted);
  font-weight: 600;
  color: var(--aia-ink);
}
.aia-msg table tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.015);
}
[data-bs-theme="dark"] .aia-msg table tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.025);
}

.aia-msg hr {
  margin: 0.85rem 0;
  border: 0;
  border-top: 1px solid var(--aia-border);
}

.aia-msg a {
  color: var(--aia-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.aia-msg a:hover { text-decoration-thickness: 2px; }

/* User bubbles invert link/heading colors for contrast */
.aia-msg--user h1, .aia-msg--user h2, .aia-msg--user h3,
.aia-msg--user h4, .aia-msg--user h5, .aia-msg--user h6,
.aia-msg--user a { color: var(--aia-on-accent); }
.aia-msg--user blockquote {
  border-left-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.10);
  color: inherit;
}
.aia-msg--user table th {
  background: rgba(255, 255, 255, 0.18);
  color: inherit;
}
.aia-msg--user table th,
.aia-msg--user table td {
  border-color: rgba(255, 255, 255, 0.28);
}

.aia-msg--user {
  width: fit-content;
  max-width: 80%;
  margin-left: auto;
  margin-right: 0;
  color: var(--aia-on-accent);
  background: var(--aia-accent);
  border-bottom-right-radius: 4px;
}

.aia-msg--user code,
.aia-msg--user pre {
  color: inherit;
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.18);
}

.aia-msg--assistant {
  margin-right: auto;
  color: var(--aia-ink);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-bottom-left-radius: 4px;
}

.aia-msg--system {
  margin: 0.4rem auto;
  max-width: 100%;
  text-align: center;
  font-size: 0.85rem;
  color: var(--aia-ink-muted);
  background: transparent;
  padding: 0.35rem 0.6rem;
}

.aia-msg--system.aia-msg--error {
  color: #c0392b;
  background: rgba(192, 57, 43, 0.08);
  border-radius: 8px;
  text-align: left;
  max-width: 92%;
  margin-right: auto;
}

.aia-msg--system .aia-retry {
  margin-left: 0.5rem;
  padding: 0.15rem 0.55rem;
  font: 500 0.8rem/1 var(--aia-font-ui);
  color: var(--aia-on-accent);
  background: var(--aia-accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.aia-msg--pending {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.85rem 0.95rem;
}

/* Round 2: refined source-missing notice — calm body + 3px amber rail */
.aia-warn {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0 0 0.55rem;
  padding: 0.5rem 0.7rem 0.5rem 0.6rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--aia-ink-soft);
  background: color-mix(in srgb, #f5b43c 8%, var(--aia-surface-muted));
  border: 1px solid color-mix(in srgb, #f5b43c 28%, transparent);
  border-left: 3px solid var(--aia-warn-rail);
  border-radius: 6px;
}

.aia-warn::before {
  content: "";
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  margin-top: 1px;
  background: var(--aia-warn-icon) center/contain no-repeat;
}

[data-bs-theme="dark"] .aia-warn {
  color: #d8c89a;
  background: color-mix(in srgb, #f5b43c 10%, var(--aia-surface-muted));
  border-color: color-mix(in srgb, #f5b43c 22%, transparent);
  border-left-color: var(--aia-warn-rail);
}

/* Round 2: 3-dot typing indicator inside pending bubble */
/* R2-P2-5: switched dot color from --aia-ink-muted to --aia-ink-soft for stronger visibility */
.aia-msg--pending .aia-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--aia-ink-soft);
  animation: aia-typing 1.4s var(--aia-ease-inout) infinite both;
  transform-origin: center;
}

/* R2-P2-1: visually-hidden screen-reader-only utility */
.aia-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.aia-msg--pending .aia-dot:nth-child(1) { animation-delay: 0ms;   }
.aia-msg--pending .aia-dot:nth-child(2) { animation-delay: 180ms; }
.aia-msg--pending .aia-dot:nth-child(3) { animation-delay: 360ms; }

@keyframes aia-typing {
  0%, 60%, 100% { opacity: 0.28; transform: translateY(0)    scale(0.85); }
  30%           { opacity: 1;    transform: translateY(-2px) scale(1);    }
}

/* Adjacent-sibling chat density */
.aia-msg + .aia-msg { margin-top: 0.7rem; }
.aia-msg--user + .aia-msg--user,
.aia-msg--assistant + .aia-msg--assistant { margin-top: 0.35rem; }

/* ---------- 6. Empty-state suggestions ---------- */
.aia-welcome {
  padding: 1rem 0.25rem 0.5rem;
  text-align: center;
}

/* Round 3: sparkle SVG above welcome title */
.aia-welcome__sparkle {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 38px;
  margin: 0 0 0.45rem;
  color: var(--aia-accent);
  opacity: 0.9;
  animation: aia-sparkle-in 480ms var(--aia-ease-out) both;
}

.aia-welcome__sparkle svg {
  display: block;
}

@keyframes aia-sparkle-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 0.9; transform: translateY(0); }
}

.aia-welcome__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--aia-ink);
}

.aia-welcome__sub {
  margin: 0 0 1.1rem;
  font-size: 0.86rem;
  color: var(--aia-ink-muted);
}

.aia-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  padding: 0 0.25rem;
}

.aia-suggest {
  padding: 0.42rem 0.85rem;
  font: 400 0.84rem/1.3 var(--aia-font-ui);
  color: var(--aia-ink-soft);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: var(--aia-radius-chip);
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              border-color var(--aia-dur-fast) var(--aia-ease-out),
              background var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-suggest:hover {
  color: var(--aia-accent);
  border-color: var(--aia-accent-ring);
  background: var(--aia-accent-soft);
}

/* ---------- 7. Composer ---------- */
.aia-composer {
  /* Round 2: flex 0 0 auto pins composer at bottom of modal */
  flex: 0 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  padding: 0.7rem 0.85rem;
  border-top: 1px solid var(--aia-border);
  background: var(--aia-surface-elevated);
}

.aia-input {
  flex: 1 1 auto;
  resize: none;
  min-height: 40px;
  max-height: 160px;
  padding: 0.55rem 0.75rem;
  font: 400 0.94rem/1.5 var(--aia-font-ui);
  color: var(--aia-ink);
  background: var(--aia-surface-elevated);
  border: 1px solid var(--aia-border-strong);
  border-radius: var(--aia-radius-input);
  transition: border-color var(--aia-dur-fast) var(--aia-ease-out),
              box-shadow var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-input:focus {
  outline: none;
  border-color: var(--aia-accent);
  box-shadow: 0 0 0 3px var(--aia-accent-ring);
}

.aia-input::placeholder {
  color: var(--aia-ink-muted);
}

.aia-send {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  color: var(--aia-on-accent);
  background: var(--aia-accent);
  border: none;
  border-radius: var(--aia-radius-input);
  cursor: pointer;
  transition: background var(--aia-dur-fast) var(--aia-ease-out),
              transform var(--aia-dur-fast) var(--aia-ease-out),
              opacity var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-send:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.aia-send:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--aia-accent-ring);
}

.aia-send:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.aia-send {
  position: relative;
}

.aia-send__icon,
.aia-send__stop {
  width: 18px;
  height: 18px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(1);
  transition: opacity var(--aia-dur-fast) var(--aia-ease-out),
              transform var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-send__stop {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.7);
  color: #ffffff;
}

/* Round 2: inflight (stop) state */
.aia-send--inflight {
  background: var(--aia-ink-soft);
  cursor: pointer;
}

.aia-send--inflight .aia-send__icon {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.7);
}

.aia-send--inflight .aia-send__stop {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.aia-send--inflight:hover {
  background: #b94e4e;
  filter: none;
  transform: none;
}

/* ---------- 8. Copy button on code blocks ---------- */
.aia-msg pre { padding-top: 1.85rem; }

.aia-copy {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 2px 8px;
  font: 500 0.72rem/1.4 var(--aia-font-ui);
  color: var(--aia-ink-muted);
  background: var(--aia-surface-elevated);
  border: 1px solid var(--aia-border);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--aia-dur-fast) var(--aia-ease-out),
              color var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-msg pre:hover .aia-copy,
.aia-copy:focus-visible {
  opacity: 1;
}

.aia-copy:hover { color: var(--aia-accent); }

/* ---------- 9. Toast (Round 3: top slide-down banner inside .aia-body) ---------- */
.aia-toast {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  display: block;
  margin: -1rem -1.1rem 0.6rem;
  padding: 0.5rem 1rem;
  font: 500 0.83rem/1.4 var(--aia-font-ui);
  color: var(--aia-ink);
  background: color-mix(in srgb, var(--aia-accent) 12%, var(--aia-surface-elevated));
  border-bottom: 1px solid color-mix(in srgb, var(--aia-accent) 30%, transparent);
  box-shadow: 0 4px 8px -4px rgba(15, 20, 28, 0.12);
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-100%);
  transition: opacity var(--aia-dur-base) var(--aia-ease-out),
              transform var(--aia-dur-base) var(--aia-ease-out);
  z-index: 5;
}

[data-bs-theme="dark"] .aia-toast {
  color: var(--aia-ink);
  background: color-mix(in srgb, var(--aia-accent) 22%, var(--aia-surface-elevated));
  border-bottom-color: color-mix(in srgb, var(--aia-accent) 40%, transparent);
}

.aia-toast--show {
  opacity: 1;
  transform: translateY(0);
}

/* Round 3: restore-banner (shown when sessionStorage thread is reloaded) */
.aia-restore-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.65rem;
  padding: 0.5rem 0.7rem;
  font-size: 0.82rem;
  color: var(--aia-ink-soft);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: 8px;
}

.aia-restore-banner__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--aia-accent);
}

.aia-restore-banner__text {
  flex: 1 1 auto;
  min-width: 0;
}

.aia-restore-banner__clear {
  flex: 0 0 auto;
  padding: 2px 8px;
  font: 500 0.78rem/1.3 var(--aia-font-ui);
  color: var(--aia-accent);
  background: transparent;
  border: 1px solid var(--aia-accent-ring);
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-restore-banner__clear:hover {
  background: var(--aia-accent-soft);
}

.aia-restore-banner__clear:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--aia-accent-ring);
}

.aia-restore-banner__dismiss {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  min-height: 24px;
  padding: 0;
  font: 500 1.05rem/1 var(--aia-font-ui);
  color: var(--aia-ink-muted);
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              background var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-restore-banner__dismiss:hover {
  color: var(--aia-ink);
  background: var(--aia-border);
}

/* Round 3: citation chip for inline [源:xxx] markers in assistant text */
.aia-cite-chip {
  display: inline-block;
  margin: 0 1px;
  padding: 0 6px;
  font: 500 0.78em/1.5 var(--aia-font-ui);
  color: var(--aia-accent);
  background: var(--aia-accent-soft);
  border: 1px solid var(--aia-accent-ring);
  border-radius: 999px;
  white-space: nowrap;
  vertical-align: baseline;
}

/* Round 3: discoverability tip popover (5s after page load, once per browser) */
.aia-discover-tip {
  position: fixed;
  z-index: 1050;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.7rem 0.45rem 0.85rem;
  font: 500 0.82rem/1.3 var(--aia-font-ui);
  color: var(--aia-on-accent);
  background: rgba(15, 20, 28, 0.92);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--aia-dur-base) var(--aia-ease-out),
              transform var(--aia-dur-base) var(--aia-ease-out);
  pointer-events: auto;
}

.aia-discover-tip--show {
  opacity: 1;
  transform: translateY(0);
}

.aia-discover-tip kbd {
  display: inline-block;
  padding: 1px 5px;
  font: 600 0.74rem/1 var(--aia-font-mono);
  color: var(--aia-on-accent);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 4px;
}

.aia-discover-tip__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0;
  font: 500 1rem/1 var(--aia-font-ui);
  color: rgba(255, 255, 255, 0.75);
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.aia-discover-tip__close:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

/* Round 2: per-bubble copy / regenerate / cite action row — always visible */
.aia-bubble__actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 0.45rem;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--aia-border);
}

.aia-bubble__act {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  color: var(--aia-ink-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: color var(--aia-dur-fast) var(--aia-ease-out),
              background var(--aia-dur-fast) var(--aia-ease-out),
              border-color var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-bubble__act:hover:not(:disabled) {
  color: var(--aia-accent);
  background: var(--aia-accent-soft);
  border-color: var(--aia-accent-ring);
}

.aia-bubble__act:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--aia-accent-ring);
}

.aia-bubble__act:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.aia-bubble__tip {
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  padding: 2px 7px;
  font: 500 0.7rem/1.3 var(--aia-font-ui);
  color: var(--aia-on-accent);
  background: rgba(15, 20, 28, 0.86);
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-bubble__act:hover .aia-bubble__tip,
.aia-bubble__act.is-flash .aia-bubble__tip,
.aia-bubble__act:focus-visible .aia-bubble__tip {
  opacity: 1;
}

/* Round 2: 查看原文 cite link */
.aia-cite {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  padding: 2px 9px 2px 7px;
  font: 500 0.74rem/1.5 var(--aia-font-ui);
  color: var(--aia-accent);
  background: var(--aia-accent-soft);
  border: 1px solid var(--aia-accent-ring);
  border-radius: 999px;
  text-decoration: none;
  transition: background var(--aia-dur-fast) var(--aia-ease-out),
              color var(--aia-dur-fast) var(--aia-ease-out);
}

.aia-cite:hover {
  background: color-mix(in srgb, var(--aia-accent) 18%, transparent);
  color: var(--aia-accent);
}

.aia-cite:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--aia-accent-ring);
}

/* Cancelled bubble: muted/strike to differentiate */
.aia-msg--cancelled {
  opacity: 0.7;
  font-style: italic;
}

/* ---------- 10. Inline confirm row (new chat) ---------- */
.aia-confirm {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.7rem;
  margin: 0.4rem 0;
  font-size: 0.85rem;
  color: var(--aia-ink-soft);
  background: var(--aia-surface-muted);
  border: 1px solid var(--aia-border);
  border-radius: 8px;
}

.aia-confirm__btn {
  padding: 0.2rem 0.65rem;
  font: 500 0.82rem/1 var(--aia-font-ui);
  border: 1px solid var(--aia-border-strong);
  border-radius: 6px;
  cursor: pointer;
}

.aia-confirm__btn--primary {
  color: var(--aia-on-accent);
  background: var(--aia-accent);
  border-color: var(--aia-accent);
}

.aia-confirm__btn--ghost {
  color: var(--aia-ink-soft);
  background: transparent;
}

/* ---------- 11. Mobile (<576px) — enforce 44×44 tap targets ---------- */
@media (max-width: 575.98px) {
  .aia-trigger__label,
  .aia-trigger__kbd { display: none; }

  .aia-trigger {
    min-width: 44px;
    min-height: 44px;
    padding: 0.32rem 0.5rem;
    justify-content: center;
  }

  .aia-modal {
    width: 100vw;
    height: 100dvh;
    max-height: 100dvh;
    border-radius: 0;
    border: none;
  }

  .aia-body {
    max-height: calc(100dvh - 132px);
  }

  .aia-composer {
    padding-bottom: calc(0.7rem + env(safe-area-inset-bottom, 0px));
  }

  /* Stop / Send and Close hit ≥44×44 on mobile */
  .aia-send,
  .aia-newchat,
  .aia-close {
    min-width: 44px;
    min-height: 44px;
  }

  .aia-restore-banner__dismiss {
    min-width: 32px;
    min-height: 32px;
  }
}

/* ---------- 12. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .aia-trigger,
  .aia-modal,
  .aia-modal::backdrop,
  .aia-msg,
  .aia-send,
  .aia-toast,
  .aia-discover-tip,
  .aia-welcome__sparkle {
    animation-duration: 1ms !important;
    transition-duration: 1ms !important;
  }
  .aia-msg--pending .aia-dot { animation: none; opacity: 0.6; }
}

/* ---------- 13. Print: hide trigger + dialog ---------- */
@media print {
  #ai-ask-trigger,
  #ai-ask-dialog,
  .aia-trigger,
  .aia-trigger--floating,
  .aia-modal,
  .aia-toast,
  .aia-discover-tip {
    display: none !important;
  }
}

/* ---------- 14. Forced-colors (Windows high-contrast) ---------- */
@media (forced-colors: active) {
  .aia-trigger,
  .aia-suggest,
  .aia-cite,
  .aia-cite-chip,
  .aia-bubble__act,
  .aia-confirm__btn,
  .aia-restore-banner__clear,
  .aia-newchat,
  .aia-close {
    color: ButtonText;
    background: ButtonFace;
    border: 1px solid ButtonText;
  }

  .aia-send,
  .aia-confirm__btn--primary,
  .aia-msg--system .aia-retry {
    color: HighlightText;
    background: Highlight;
    border: 1px solid Highlight;
  }

  .aia-msg--user {
    color: HighlightText;
    background: Highlight;
    border: 1px solid Highlight;
  }

  .aia-msg--assistant {
    color: CanvasText;
    background: Canvas;
    border: 1px solid CanvasText;
  }

  .aia-modal {
    color: CanvasText;
    background: Canvas;
    border: 1px solid CanvasText;
  }

  .aia-trigger:focus-visible,
  .aia-send:focus-visible,
  .aia-suggest:focus-visible,
  .aia-bubble__act:focus-visible,
  .aia-newchat:focus-visible,
  .aia-close:focus-visible,
  .aia-restore-banner__clear:focus-visible {
    outline: 2px solid Highlight;
    outline-offset: 2px;
    box-shadow: none;
  }
}

/* ---------- Round 2: phone full-bleed (narrow + short viewports) ---------- */
@media (max-width: 600px), (max-height: 640px) {
  .aia-modal {
    width: 100vw;
    max-width: 100vw;
    height: 100vh;
    height: 100dvh;
    max-height: 100vh;
    max-height: 100dvh;
    margin: 0;
    border-radius: 0;
  }
}

/* ---------- Round 2: Quarto-style callouts (preprocess → div → style) ---------- */
.aia-callout {
  margin: 0.85rem 0;
  padding: 0.7rem 0.85rem 0.7rem 1rem;
  border-left: 3px solid var(--aia-accent);
  background: color-mix(in srgb, var(--aia-accent) 6%, var(--aia-surface));
  border-radius: 6px;
  font-size: 0.95em;
}
.aia-callout > :first-child { margin-top: 0; }
.aia-callout > :last-child { margin-bottom: 0; }
.aia-callout--note      { border-left-color: #2780e3; background: color-mix(in srgb, #2780e3 7%, var(--aia-surface)); }
.aia-callout--tip       { border-left-color: #3fb618; background: color-mix(in srgb, #3fb618 7%, var(--aia-surface)); }
.aia-callout--warning   { border-left-color: #ff7518; background: color-mix(in srgb, #ff7518 7%, var(--aia-surface)); }
.aia-callout--important { border-left-color: #9954bb; background: color-mix(in srgb, #9954bb 7%, var(--aia-surface)); }
.aia-callout--caution   { border-left-color: #e0205a; background: color-mix(in srgb, #e0205a 7%, var(--aia-surface)); }

/* ---------- Streaming caret cursor ---------- */
.aia-cursor {
  display: inline-block;
  width: 0.55ch;
  margin-left: 1px;
  animation: aia-blink 1s steps(1) infinite;
  opacity: 0.7;
  color: var(--aia-accent);
}
@keyframes aia-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .aia-cursor { animation: none; opacity: 0.7; }
}


/* Round 3: truncation marker shown when LLM stops due to max_tokens */
.aia-truncated {
  display: block;
  margin-top: 0.55rem;
  padding-top: 0.45rem;
  border-top: 1px dashed var(--aia-border);
  font-size: 0.78em;
  color: var(--aia-muted, #888);
  font-style: italic;
}