/* LS100 course search widget - matches the crimson/ink branding in ls100.css.
   Tokens are re-declared with fallbacks so the widget still looks right if it
   loads on a page where ls100.css has not applied. */

.ls100-chat {
  --lsc-crimson: var(--ls100-crimson, #A51C30);
  --lsc-crimson-dark: var(--ls100-crimson-dark, #7d1524);
  --lsc-ink: var(--ls100-ink, #1F2933);
  --lsc-surface: #ffffff;
  --lsc-muted: #5B6570;
  --lsc-line: #e3e6e8;
  --lsc-tint: #f6f7f8;

  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 9999;
  font-family: Arial, "Helvetica Neue", Helvetica, system-ui, sans-serif;
}

/* ------------------------------------------------------------ launcher */
.ls100-chat__fab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.1rem;
  border: 0;
  border-radius: 999px;
  background: var(--lsc-crimson);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
  transition: background 0.15s ease, transform 0.15s ease;
}
.ls100-chat__fab:hover { background: var(--lsc-crimson-dark); transform: translateY(-1px); }
.ls100-chat__fab:focus-visible { outline: 3px solid var(--lsc-ink); outline-offset: 2px; }
.ls100-chat.is-open .ls100-chat__fab { display: none; }

/* --------------------------------------------------------------- panel */
.ls100-chat__panel {
  display: flex;
  flex-direction: column;
  width: min(29rem, calc(100vw - 2.5rem));
  max-height: min(34rem, calc(100vh - 3rem));
  background: var(--lsc-surface);
  color: var(--lsc-ink);
  border: 1px solid var(--lsc-line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.26);
}
.ls100-chat__panel[hidden] { display: none; }

.ls100-chat__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  background: var(--lsc-crimson);
  color: #fff;
}
.ls100-chat__head strong { display: block; font-size: 1rem; }
.ls100-chat__sub { display: block; font-size: 0.75rem; opacity: 0.9; margin-top: 0.15rem; }
.ls100-chat__close {
  border: 0;
  background: transparent;
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0.25rem;
}
.ls100-chat__close:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

/* ---------------------------------------------------------------- form */
.ls100-chat__form {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--lsc-line);
}
.ls100-chat__input {
  flex: 1;
  min-width: 0;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--lsc-line);
  border-radius: 8px;
  font: inherit;
  font-size: 0.9rem;
  color: var(--lsc-ink);
  background: var(--lsc-surface);
}
.ls100-chat__input:focus-visible { outline: 2px solid var(--lsc-crimson); outline-offset: 1px; }
.ls100-chat__go {
  padding: 0.55rem 0.9rem;
  border: 0;
  border-radius: 8px;
  background: var(--lsc-ink);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
}
.ls100-chat__go:hover { background: #000; }
.ls100-chat__go:focus-visible { outline: 3px solid var(--lsc-crimson); outline-offset: 2px; }

/* -------------------------------------------------------------- results */
.ls100-chat__body {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  -webkit-overflow-scrolling: touch;
}
.ls100-chat__msg {
  padding: 1rem 0.85rem;
  color: var(--lsc-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}
.ls100-chat__msg small { font-size: 0.8rem; opacity: 0.85; }
.ls100-chat__msg--error { color: var(--lsc-crimson); }

.ls100-chat__hit {
  display: block;
  padding: 0.7rem 0.85rem;
  border-radius: 9px;
  color: inherit;
  text-decoration: none;
  border: 1px solid transparent;
}
.ls100-chat__hit + .ls100-chat__hit { margin-top: 0.15rem; }
.ls100-chat__hit:hover { background: var(--lsc-tint); border-color: var(--lsc-line); }
.ls100-chat__hit:focus-visible { outline: 2px solid var(--lsc-crimson); outline-offset: -2px; }

.ls100-chat__kind {
  display: inline-block;
  margin-bottom: 0.3rem;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  background: var(--lsc-tint);
  border: 1px solid var(--lsc-line);
  color: var(--lsc-muted);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.ls100-chat__kind--guide { color: var(--lsc-crimson); border-color: currentColor; }
.ls100-chat__kind--notebook { color: #1b6b4a; border-color: currentColor; }
.ls100-chat__kind--pdf { color: #8a5a00; border-color: currentColor; }

.ls100-chat__where {
  display: block;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--lsc-ink);
  line-height: 1.35;
}
.ls100-chat__crumb { font-weight: 400; color: var(--lsc-muted); }
.ls100-chat__snip {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--lsc-muted);
}

.ls100-chat__foot {
  padding: 0.5rem 0.85rem;
  border-top: 1px solid var(--lsc-line);
  background: var(--lsc-tint);
  color: var(--lsc-muted);
  font-size: 0.72rem;
  text-align: center;
}

/* ----------------------------------------------------------- dark mode
   Keyed to the book theme's own `html.dark` class rather than
   prefers-color-scheme: the theme has a manual toggle, so a reader on a light
   OS who switches the site to dark would otherwise get a light widget on a
   dark page. The theme already follows the OS on first visit. */
html.dark .ls100-chat {
  --lsc-surface: #1c2126;
  --lsc-ink: #e8ebed;
  --lsc-muted: #9aa5ae;
  --lsc-line: #333c44;
  --lsc-tint: #252c32;
}
html.dark .ls100-chat__go { background: #e8ebed; color: #10151a; }
html.dark .ls100-chat__go:hover { background: #fff; }
html.dark .ls100-chat__kind--notebook { color: #6dd3a6; }
html.dark .ls100-chat__kind--pdf { color: #e0b25f; }

@media (max-width: 480px) {
  .ls100-chat { right: 0.75rem; bottom: 0.75rem; }
  .ls100-chat__panel { max-height: min(30rem, calc(100vh - 2rem)); }
  .ls100-chat__fab span { display: none; }
  .ls100-chat__fab { padding: 0.85rem; }
}

@media (prefers-reduced-motion: reduce) {
  .ls100-chat__fab { transition: none; }
  .ls100-chat__fab:hover { transform: none; }
}