:root {
  --boost-bg: #ffffff;
  --boost-surface: #f5f7fb;
  --boost-surface-soft: #f8fafc;
  --boost-text: #17324d;
  --boost-text-muted: #64748b;
  --boost-border: #e4e9f0;
  --boost-blue: #1167d8;
  --boost-cyan: #22c7f2;
  --boost-violet: #7448ff;
  --boost-purple: #a62bff;
  --focus-ring: #1167d8;
  --bs-chat-z: 99990;
  --bs-radius: 14px;
  --bs-read-max: 800px;
}

.bs-chat-launcher {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: var(--bs-chat-z);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 18px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--boost-blue), var(--boost-cyan));
  color: #fff;
  font: 600 15px/1.2 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(17, 103, 216, 0.28);
}

.bs-chat-launcher:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.bs-chat-launcher[hidden],
.bs-chat-workspace[hidden] {
  display: none !important;
}

/* Full-screen AI workspace — not an enlarged modal card */
.bs-chat-workspace {
  position: fixed;
  inset: 0;
  z-index: calc(var(--bs-chat-z) + 1);
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100dvh;
  background: var(--boost-bg);
  color: var(--boost-text);
  font: 400 15px/1.5 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-workspace::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background:
    radial-gradient(circle at 88% 8%, rgba(34, 199, 242, 0.22), transparent 32%),
    radial-gradient(circle at 12% 90%, rgba(116, 72, 255, 0.14), transparent 36%);
  z-index: 0;
}

.bs-chat-workspace > * {
  position: relative;
  z-index: 1;
}

/* Header */
.bs-chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-shrink: 0;
  padding: 12px 20px;
  border-bottom: 1px solid var(--boost-border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
}

.bs-chat-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.bs-chat-logo {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background:
    radial-gradient(circle at 30% 30%, rgba(34, 199, 242, 0.95), transparent 55%),
    radial-gradient(circle at 70% 70%, rgba(116, 72, 255, 0.9), transparent 60%),
    linear-gradient(135deg, var(--boost-blue), var(--boost-violet));
  box-shadow: 0 4px 14px rgba(17, 103, 216, 0.22);
}

.bs-chat-brand-text h1 {
  margin: 0;
  font: 650 17px/1.25 "Segoe UI", system-ui, sans-serif;
  letter-spacing: -0.01em;
}

.bs-chat-brand-text p {
  margin: 2px 0 0;
  color: var(--boost-text-muted);
  font: 400 12px/1.35 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.bs-chat-lang {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--boost-border);
  border-radius: 999px;
  background: var(--boost-surface);
}

.bs-chat-lang button {
  min-height: 32px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--boost-text-muted);
  font: 600 12px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
}

.bs-chat-lang button[aria-pressed="true"] {
  background: #fff;
  color: var(--boost-blue);
  box-shadow: 0 1px 4px rgba(23, 50, 77, 0.1);
}

.bs-chat-icon-btn,
.bs-chat-text-btn {
  min-height: 40px;
  border: 1px solid var(--boost-border);
  border-radius: 10px;
  background: #fff;
  color: var(--boost-text);
  font: 600 13px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
}

.bs-chat-text-btn {
  padding: 0 12px;
}

.bs-chat-icon-btn {
  width: 40px;
  font-size: 20px;
  line-height: 1;
}

.bs-chat-icon-btn:focus-visible,
.bs-chat-text-btn:focus-visible,
.bs-chat-lang button:focus-visible,
.bs-chat-chip:focus-visible,
.bs-chat-form button:focus-visible,
.bs-chat-panel-toggle:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Body: conversation + explore */
.bs-chat-body {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 30%);
  min-height: 0;
  overflow: hidden;
}

.bs-chat-body.bs-panel-collapsed {
  grid-template-columns: 1fr;
}

.bs-chat-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  border-right: 1px solid var(--boost-border);
}

.bs-chat-body.bs-panel-collapsed .bs-chat-main {
  border-right: 0;
}

.bs-chat-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px 12px;
  scroll-behavior: smooth;
}

.bs-chat-scroll-inner {
  max-width: var(--bs-read-max);
  margin: 0 auto;
  width: 100%;
}

/* Empty / welcome */
.bs-chat-welcome {
  padding: 28px 8px 16px;
}

.bs-chat-welcome h2 {
  margin: 0 0 10px;
  font: 700 28px/1.2 "Segoe UI", system-ui, sans-serif;
  letter-spacing: -0.02em;
  background: linear-gradient(105deg, var(--boost-blue), var(--boost-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.bs-chat-welcome > p {
  margin: 0 0 22px;
  max-width: 42rem;
  color: var(--boost-text-muted);
  font-size: 16px;
}

.bs-chat-welcome-label {
  margin: 0 0 10px;
  color: var(--boost-text);
  font: 600 13px/1.3 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.bs-chat-chip {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--boost-border);
  border-radius: 999px;
  background: #fff;
  color: var(--boost-text);
  font: 500 13px/1.3 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.bs-chat-chip:hover {
  border-color: rgba(17, 103, 216, 0.45);
  box-shadow: 0 4px 14px rgba(17, 103, 216, 0.08);
}

.bs-chat-helper {
  margin: 0;
  color: var(--boost-text-muted);
  font-size: 13px;
}

/* Messages */
.bs-chat-messages {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-bottom: 8px;
}

.bs-chat-msg {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 100%;
}

.bs-chat-msg[data-role="user"] {
  align-items: flex-end;
}

.bs-chat-msg[data-role="assistant"],
.bs-chat-msg[data-role="error"] {
  align-items: flex-start;
}

.bs-chat-bubble-user {
  max-width: min(72%, 520px);
  padding: 10px 14px;
  border-radius: 16px 16px 4px 16px;
  background: linear-gradient(135deg, #e8f4fd, #eef7ff);
  border: 1px solid #d3e7fa;
  color: var(--boost-text);
  font: 400 14px/1.45 "Segoe UI", system-ui, sans-serif;
  white-space: pre-wrap;
  word-break: break-word;
}

.bs-chat-assistant-body {
  width: 100%;
  max-width: var(--bs-read-max);
  padding: 4px 2px;
  color: var(--boost-text);
  font: 400 15px/1.55 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-assistant-body h3,
.bs-chat-assistant-body h4 {
  margin: 1em 0 0.4em;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.bs-chat-assistant-body h3:first-child,
.bs-chat-assistant-body h4:first-child,
.bs-chat-assistant-body p:first-child {
  margin-top: 0;
}

.bs-chat-assistant-body p {
  margin: 0 0 0.75em;
}

.bs-chat-assistant-body ul,
.bs-chat-assistant-body ol {
  margin: 0 0 0.85em;
  padding-left: 1.25em;
}

.bs-chat-assistant-body li {
  margin: 0.25em 0;
}

.bs-chat-assistant-body a {
  color: var(--boost-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.bs-chat-assistant-body strong {
  font-weight: 650;
}

.bs-chat-assistant-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75em 0;
  font-size: 13px;
}

.bs-chat-assistant-body th,
.bs-chat-assistant-body td {
  border: 1px solid var(--boost-border);
  padding: 6px 8px;
  text-align: left;
}

.bs-chat-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--boost-text-muted);
  font: 500 14px/1.4 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--boost-cyan), var(--boost-violet));
  animation: bs-pulse 1.1s ease-in-out infinite;
}

@keyframes bs-pulse {
  0%,
  100% {
    opacity: 0.35;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1);
  }
}

.bs-chat-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.bs-chat-sources {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--boost-border);
}

.bs-chat-sources-label {
  margin: 0 0 8px;
  color: var(--boost-text-muted);
  font: 600 11px/1.3 "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.bs-chat-source-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bs-chat-source-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  color: var(--boost-blue);
  font-size: 13px;
  text-decoration: none;
}

.bs-chat-source-link:hover {
  text-decoration: underline;
}

.bs-chat-resource-card {
  margin: 10px 0;
  padding: 14px 16px;
  border: 1px solid var(--boost-border);
  border-radius: var(--bs-radius);
  background: var(--boost-surface-soft);
}

.bs-chat-resource-card .bs-card-kicker {
  margin: 0 0 4px;
  color: var(--boost-violet);
  font: 650 11px/1.2 "Segoe UI", system-ui, sans-serif;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.bs-chat-resource-card h4 {
  margin: 0 0 6px;
  font: 650 15px/1.3 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-resource-card p {
  margin: 0 0 10px;
  color: var(--boost-text-muted);
  font-size: 13px;
}

.bs-chat-resource-card a {
  font: 600 13px/1 "Segoe UI", system-ui, sans-serif;
  color: var(--boost-blue);
  text-decoration: none;
}

.bs-chat-resource-card a:hover {
  text-decoration: underline;
}

.bs-chat-error-box {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--bs-radius);
  background: #fff5f4;
  border: 1px solid #ffd0cb;
  color: #8a2f28;
}

.bs-chat-error-box button {
  margin-top: 10px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid #f0b4ad;
  border-radius: 8px;
  background: #fff;
  color: #8a2f28;
  font: 600 13px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
}

/* Composer */
.bs-chat-composer-wrap {
  flex-shrink: 0;
  padding: 12px 28px 10px;
  border-top: 1px solid var(--boost-border);
  background: rgba(248, 250, 252, 0.96);
}

.bs-chat-composer-inner {
  max-width: var(--bs-read-max);
  margin: 0 auto;
}

.bs-chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

.bs-chat-form textarea {
  resize: none;
  min-height: 48px;
  max-height: 140px;
  padding: 12px 14px;
  border: 1px solid var(--boost-border);
  border-radius: 14px;
  font: 400 15px/1.4 "Segoe UI", system-ui, sans-serif;
  color: var(--boost-text);
  background: #fff;
}

.bs-chat-form textarea:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 1px;
}

.bs-chat-form button[type="submit"] {
  min-width: 96px;
  min-height: 48px;
  padding: 0 18px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--boost-blue), #0f7fd4);
  color: #fff;
  font: 600 14px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
}

.bs-chat-form button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: wait;
}

.bs-chat-footnote {
  margin: 8px 0 0;
  color: var(--boost-text-muted);
  font: 400 11px/1.45 "Segoe UI", system-ui, sans-serif;
}

/* Explore panel */
.bs-chat-side {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--boost-surface);
  overflow: hidden;
}

.bs-chat-side-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--boost-border);
}

.bs-chat-side-head h2 {
  margin: 0;
  font: 650 14px/1.3 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-panel-toggle {
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--boost-border);
  border-radius: 8px;
  background: #fff;
  color: var(--boost-text-muted);
  font: 600 12px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
}

.bs-chat-side-cards {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bs-chat-explore-card {
  text-align: left;
  padding: 14px;
  border: 1px solid var(--boost-border);
  border-radius: var(--bs-radius);
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.bs-chat-explore-card:hover {
  border-color: rgba(17, 103, 216, 0.4);
  transform: translateY(-1px);
}

.bs-chat-explore-card strong {
  display: block;
  margin-bottom: 4px;
  font: 650 13px/1.3 "Segoe UI", system-ui, sans-serif;
  color: var(--boost-text);
}

.bs-chat-explore-card span {
  display: block;
  color: var(--boost-text-muted);
  font: 400 12px/1.4 "Segoe UI", system-ui, sans-serif;
}

.bs-chat-reopen-panel {
  position: absolute;
  top: 72px;
  right: 12px;
  z-index: 2;
  display: none;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--boost-border);
  border-radius: 999px;
  background: #fff;
  color: var(--boost-blue);
  font: 600 12px/1 "Segoe UI", system-ui, sans-serif;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(23, 50, 77, 0.1);
}

.bs-chat-body.bs-panel-collapsed .bs-chat-reopen-panel {
  display: inline-flex;
  align-items: center;
}

.bs-chat-body.bs-panel-collapsed .bs-chat-side {
  display: none;
}

/* Tablet / mobile */
@media (max-width: 960px) {
  .bs-chat-body {
    grid-template-columns: 1fr;
  }

  .bs-chat-side {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(340px, 88vw);
    z-index: 5;
    box-shadow: -12px 0 40px rgba(23, 50, 77, 0.16);
    transform: translateX(105%);
    transition: transform 0.2s ease;
  }

  .bs-chat-body.bs-panel-open-mobile .bs-chat-side {
    transform: translateX(0);
  }

  .bs-chat-body.bs-panel-collapsed .bs-chat-side {
    display: flex;
  }

  .bs-chat-main {
    border-right: 0;
  }

  .bs-chat-reopen-panel {
    display: inline-flex !important;
    align-items: center;
  }

  .bs-chat-scroll,
  .bs-chat-composer-wrap {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 640px) {
  .bs-chat-launcher {
    right: 12px;
    bottom: 12px;
  }

  .bs-chat-header {
    padding: 10px 12px;
    gap: 8px;
  }

  .bs-chat-brand-text h1 {
    font-size: 15px;
  }

  .bs-chat-brand-text p {
    display: none;
  }

  .bs-chat-welcome h2 {
    font-size: 22px;
  }

  .bs-chat-topics {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .bs-chat-chip {
    flex-shrink: 0;
  }

  .bs-chat-composer-wrap {
    padding-bottom: max(10px, env(safe-area-inset-bottom));
  }

  .bs-chat-form {
    grid-template-columns: 1fr;
  }

  .bs-chat-form button[type="submit"] {
    width: 100%;
  }

  .bs-chat-text-btn {
    padding: 0 10px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bs-chat-status::before,
  .bs-chat-explore-card,
  .bs-chat-side {
    animation: none;
    transition: none;
  }
}