.sia-chat {
  --sia-panel-width: 420px;
  --sia-panel-max-width: 860px;
  --sia-panel-height: 560px;
  --sia-button-size: 58px;
  --sia-bg: #ffffff;
  --sia-header-bg: #fafafa;
  --sia-text: #151515;
  --sia-muted: #666666;
  --sia-accent: #111111;
  --sia-accent-text: #ffffff;
  --sia-bot-bg: #f1f1f1;
  --sia-user-bg: #111111;
  --sia-user-text: #ffffff;
  --sia-border: rgba(0,0,0,.10);
  --sia-radius: 22px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  z-index: 99999;
  color: var(--sia-text);
  box-sizing: border-box;
}

.sia-chat *, .sia-chat *::before, .sia-chat *::after { box-sizing: border-box; }

.sia-chat-floating { position: fixed; right: 24px; bottom: 24px; }
.sia-position-left.sia-chat-floating { right: auto; left: 24px; }

.sia-chat-toggle {
  border: 0;
  cursor: pointer;
  min-width: var(--sia-button-size);
  height: var(--sia-button-size);
  background: var(--sia-accent);
  color: var(--sia-accent-text);
  box-shadow: 0 16px 40px rgba(0,0,0,.22);
  transition: transform .22s ease, box-shadow .22s ease, opacity .22s ease;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.sia-chat-toggle:hover { transform: translateY(-1px); box-shadow: 0 20px 52px rgba(0,0,0,.28); }
.sia-button-circle .sia-chat-toggle { width: var(--sia-button-size); border-radius: 999px; padding: 0; }
.sia-button-pill .sia-chat-toggle { width: auto; min-width: calc(var(--sia-button-size) * 2.2); padding: 0 22px; border-radius: 999px; letter-spacing: .02em; }

.sia-chat-backdrop { display: none; }
.sia-has-overlay.is-open .sia-chat-backdrop { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.58); backdrop-filter: blur(2px); z-index: 99998; }

.sia-chat-panel {
  position: absolute;
  right: 0;
  bottom: calc(var(--sia-button-size) + 16px);
  width: min(var(--sia-panel-width), calc(100vw - 32px));
  height: min(var(--sia-panel-height), calc(100vh - 120px));
  background: var(--sia-bg);
  color: var(--sia-text);
  border: 1px solid var(--sia-border);
  border-radius: var(--sia-radius);
  box-shadow: 0 24px 70px rgba(0,0,0,.24);
  display: none;
  overflow: hidden;
  z-index: 99999;
}

.sia-chat.is-open .sia-chat-panel { display: flex; flex-direction: column; }
.sia-position-left .sia-chat-panel { right: auto; left: 0; }

.sia-chat-inline .sia-chat-panel, .sia-chat-manual .sia-chat-panel { position: fixed; right: 24px; bottom: 24px; }
.sia-position-left.sia-chat-inline .sia-chat-panel, .sia-position-left.sia-chat-manual .sia-chat-panel { right: auto; left: 24px; }

.sia-layout-center .sia-chat-panel {
  position: fixed;
  left: 50%;
  right: auto;
  top: 50%;
  bottom: auto;
  width: min(var(--sia-panel-max-width), calc(100vw - 48px));
  height: min(var(--sia-panel-height), calc(100vh - 80px));
  transform: translate(-50%, -50%);
  box-shadow: 0 32px 90px rgba(0,0,0,.30);
}

.sia-layout-fullscreen .sia-chat-panel {
  position: fixed;
  inset: 0;
  width: auto;
  height: auto;
  max-height: none;
  transform: none;
  border-radius: 0;
  border: 0;
  box-shadow: none;
}

.sia-layout-center.is-open .sia-chat-toggle, .sia-layout-fullscreen.is-open .sia-chat-toggle { opacity: 0; pointer-events: none; }

.sia-chat-header {
  flex: 0 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  border-bottom: 1px solid var(--sia-border);
  background: var(--sia-header-bg);
}

.sia-layout-center .sia-chat-header, .sia-layout-fullscreen .sia-chat-header { padding: 24px 32px; }
.sia-layout-fullscreen .sia-chat-header { width: min(var(--sia-panel-max-width), calc(100vw - 64px)); margin: 0 auto; padding-left: 0; padding-right: 0; border-bottom: 0; }

.sia-chat-brand { display: flex; align-items: center; gap: 14px; }
.sia-chat-spark { color: var(--sia-accent); font-size: 20px; line-height: 1; }
.sia-chat-header strong { display: block; font-size: 15px; color: var(--sia-text); }
.sia-chat-close { width: 34px; height: 34px; border: 0; border-radius: 999px; background: transparent; color: var(--sia-text); cursor: pointer; font-size: 30px; line-height: 1; display: inline-flex; align-items: center; justify-content: center; }

.sia-chat-messages {
  flex: 1 1 auto;
  min-height: 0;
  padding: 16px;
  overflow: auto;
  background: var(--sia-bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sia-layout-center .sia-chat-messages { padding: 28px 48px; }
.sia-layout-fullscreen .sia-chat-messages { width: min(var(--sia-panel-max-width), calc(100vw - 64px)); margin: 0 auto; padding: 32px 0; gap: 18px; }

.sia-message {
  width: fit-content;
  max-width: 88%;
  padding: 10px 12px;
  margin: 0;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
}

.sia-layout-center .sia-message, .sia-layout-fullscreen .sia-message { max-width: min(760px, 90%); font-size: 16px; line-height: 1.58; padding: 14px 18px; }
.sia-message-bot { align-self: flex-start; background: var(--sia-bot-bg); color: var(--sia-text); border-bottom-left-radius: 4px; }
.sia-message-user { align-self: flex-end; background: var(--sia-user-bg); color: var(--sia-user-text); border-bottom-right-radius: 4px; }

.sia-sources { align-self: flex-start; margin: -4px 0 8px; padding-left: 2px; font-size: 12px; color: var(--sia-muted); max-width: min(760px, 90%); }
.sia-sources a { display: block; color: var(--sia-text); text-decoration: underline; margin-top: 4px; }

.sia-privacy { flex: 0 0 auto; display: flex; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--sia-border); background: var(--sia-bg); font-size: 11px; line-height: 1.35; color: var(--sia-muted); }
.sia-layout-center .sia-privacy { padding-left: 48px; padding-right: 48px; }
.sia-layout-fullscreen .sia-privacy { width: min(var(--sia-panel-max-width), calc(100vw - 64px)); margin: 0 auto; padding-left: 0; padding-right: 0; border-top: 0; }
.sia-privacy input { margin-top: 2px; flex: 0 0 auto; }

.sia-chat-form {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--sia-border);
  background: var(--sia-header-bg);
}

.sia-layout-center .sia-chat-form { width: calc(100% - 64px); margin: 0 32px 24px; border: 1px solid var(--sia-accent); border-radius: calc(var(--sia-radius) * .6); background: var(--sia-bg); padding: 14px; }
.sia-layout-fullscreen .sia-chat-form { width: min(var(--sia-panel-max-width), calc(100vw - 64px)); margin: 0 auto 24px; border: 1px solid var(--sia-accent); border-radius: calc(var(--sia-radius) * .6); background: var(--sia-bg); padding: 14px; }

.sia-chat-form input {
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--sia-border);
  border-radius: 999px;
  padding: 0 14px;
  font-size: 14px;
  background: var(--sia-bg);
  color: var(--sia-text);
  box-shadow: none !important;
  outline: none !important;
}

.sia-layout-center .sia-chat-form input, .sia-layout-fullscreen .sia-chat-form input { border: 0; border-radius: 0; background: transparent; font-size: 16px; min-height: 46px; }
.sia-chat-form input::placeholder { color: var(--sia-muted); }

.sia-chat-form button {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 999px;
  padding: 0;
  background: var(--sia-accent);
  color: var(--sia-accent-text);
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.sia-chat-form button span { display: inline-block; transform: translateX(1px); }

@media (max-width: 600px) {
  .sia-chat-floating { right: 16px; bottom: 16px; }
  .sia-position-left.sia-chat-floating { left: 16px; }
  .sia-chat-panel, .sia-chat-inline .sia-chat-panel, .sia-chat-manual .sia-chat-panel, .sia-layout-center .sia-chat-panel {
    position: fixed; right: 12px; left: 12px; top: auto; bottom: 12px; width: auto; height: min(560px, calc(100vh - 24px)); max-height: calc(100vh - 24px); transform: none;
  }
  .sia-layout-fullscreen .sia-chat-panel { inset: 0; height: auto; max-height: none; }
  .sia-layout-center .sia-chat-header, .sia-layout-center .sia-chat-messages { padding-left: 18px; padding-right: 18px; }
  .sia-layout-center .sia-chat-form { width: auto; margin: 0 12px 12px; }
  .sia-layout-fullscreen .sia-chat-header, .sia-layout-fullscreen .sia-chat-messages, .sia-layout-fullscreen .sia-chat-form, .sia-layout-fullscreen .sia-privacy { width: auto; margin-left: 12px; margin-right: 12px; }
  .sia-message, .sia-layout-center .sia-message, .sia-layout-fullscreen .sia-message { max-width: 92%; font-size: 14px; }
}


/* v0.3.5 stable: natural inline links and source cards */
.sia-message a { color: currentColor; text-decoration: underline; text-underline-offset: 3px; }
.sia-message-bot a { color: var(--sia-accent); }
.sia-source-cards { align-self: stretch; display: grid; gap: 10px; margin: -2px 0 10px; max-width: min(760px, 92%); }
.sia-layout-center .sia-source-cards, .sia-layout-fullscreen .sia-source-cards { max-width: min(760px, 90%); }
.sia-source-card { display: grid; grid-template-columns: 86px 1fr; gap: 12px; align-items: stretch; min-height: 74px; overflow: hidden; border: 1px solid var(--sia-border); border-radius: calc(var(--sia-radius) * .55); background: var(--sia-header-bg); color: var(--sia-text); text-decoration: none; }
.sia-source-card:hover { border-color: var(--sia-accent); }
.sia-source-card img { width: 86px; height: 100%; min-height: 74px; object-fit: cover; display: block; }
.sia-source-card-body { display: flex; flex-direction: column; justify-content: center; gap: 4px; padding: 10px 12px 10px 0; min-width: 0; }
.sia-source-card:not(:has(img)) { grid-template-columns: 1fr; }
.sia-source-card:not(:has(img)) .sia-source-card-body { padding: 12px; }
.sia-source-card-eyebrow { font-size: 10px; line-height: 1; letter-spacing: .14em; text-transform: uppercase; color: var(--sia-muted); }
.sia-source-card strong { font-size: 13px; line-height: 1.25; color: var(--sia-text); }
@media (max-width: 600px) { .sia-source-cards { max-width: 100%; } .sia-source-card { grid-template-columns: 72px 1fr; } .sia-source-card img { width: 72px; } }


/* v0.3.9: hidden footer chat instance for menu trigger */
.sia-chat-menu-target {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 99999;
  width: 0;
  height: 0;
  overflow: visible;
}

.sia-chat-menu-target > .sia-chat-toggle {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  min-width: 1px !important;
  padding: 0 !important;
  opacity: 0 !important;
  pointer-events: none !important;
  visibility: hidden !important;
}

.sia-chat-menu-target .sia-chat-panel {
  position: fixed;
  right: 24px;
  bottom: 24px;
}

.sia-position-left.sia-chat-menu-target .sia-chat-panel {
  right: auto;
  left: 24px;
}

@media (max-width: 600px) {
  .sia-chat-menu-target .sia-chat-panel {
    right: 12px;
    left: 12px;
    bottom: 12px;
    width: auto;
  }
}


/* v0.3.10: completely hide the technical menu-trigger button */
.sia-chat-menu-target {
  position: fixed !important;
  right: auto !important;
  left: -99999px !important;
  bottom: auto !important;
  top: -99999px !important;
  width: 0 !important;
  height: 0 !important;
  min-width: 0 !important;
  min-height: 0 !important;
  overflow: visible !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
}

.sia-chat-menu-target > .sia-chat-toggle,
.sia-chat-menu-target > .sia-chat-toggle-hidden-trigger {
  display: block !important;
  position: absolute !important;
  left: -99999px !important;
  top: -99999px !important;
  width: 1px !important;
  height: 1px !important;
  min-width: 1px !important;
  min-height: 1px !important;
  max-width: 1px !important;
  max-height: 1px !important;
  overflow: hidden !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  padding: 0 !important;
  margin: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
  transform: none !important;
}

.sia-chat-menu-target > .sia-chat-toggle span,
.sia-chat-menu-target > .sia-chat-toggle-hidden-trigger span {
  display: none !important;
}

.sia-chat-menu-target.is-open {
  left: auto !important;
  top: auto !important;
  right: 24px !important;
  bottom: 24px !important;
  width: 0 !important;
  height: 0 !important;
}

.sia-chat-menu-target.is-open .sia-chat-panel {
  display: flex !important;
  position: fixed !important;
  right: 24px;
  bottom: 24px;
  left: auto;
  top: auto;
}

@media (max-width: 600px) {
  .sia-chat-menu-target.is-open .sia-chat-panel {
    right: 12px;
    left: 12px;
    bottom: 12px;
    width: auto;
  }
}


/* v0.3.11: menu target renders no button; only panel when opened */
.sia-chat-menu-target {
  position: static !important;
  width: 0 !important;
  height: 0 !important;
  min-width: 0 !important;
  min-height: 0 !important;
  overflow: visible !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
}

.sia-chat-menu-target > .sia-chat-toggle {
  display: none !important;
}

.sia-chat-menu-target:not(.is-open) .sia-chat-panel {
  display: none !important;
}

.sia-chat-menu-target.is-open .sia-chat-panel {
  display: flex !important;
  position: fixed !important;
  right: 24px !important;
  bottom: 24px !important;
  left: auto !important;
  top: auto !important;
  transform: none !important;
  z-index: 99999 !important;
}

.sia-position-left.sia-chat-menu-target.is-open .sia-chat-panel {
  right: auto !important;
  left: 24px !important;
}

@media (max-width: 600px) {
  .sia-chat-menu-target.is-open .sia-chat-panel {
    right: 12px !important;
    left: 12px !important;
    bottom: 12px !important;
    width: auto !important;
  }
}


/* v0.3.12: definitive menu target no-button guard */
.sia-chat-menu-target {
  position: static !important;
  display: block !important;
  width: 0 !important;
  height: 0 !important;
  min-width: 0 !important;
  min-height: 0 !important;
  overflow: visible !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
  background: transparent !important;
}

.sia-chat-menu-target .sia-chat-toggle,
.sia-chat-menu-target button.sia-chat-toggle,
.sia-chat-menu-target > button,
.sia-chat-menu-target > .sia-open-button {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
  position: absolute !important;
  left: -999999px !important;
  top: -999999px !important;
  width: 0 !important;
  height: 0 !important;
  min-width: 0 !important;
  min-height: 0 !important;
  padding: 0 !important;
  margin: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
}

.sia-chat-menu-target:not(.is-open) .sia-chat-panel {
  display: none !important;
}

.sia-chat-menu-target.is-open .sia-chat-panel {
  display: flex !important;
  position: fixed !important;
  right: 24px !important;
  bottom: 24px !important;
  left: auto !important;
  top: auto !important;
  transform: none !important;
  z-index: 99999 !important;
}

.sia-position-left.sia-chat-menu-target.is-open .sia-chat-panel {
  right: auto !important;
  left: 24px !important;
}

@media (max-width: 600px) {
  .sia-chat-menu-target.is-open .sia-chat-panel {
    right: 12px !important;
    left: 12px !important;
    bottom: 12px !important;
    width: auto !important;
  }
}