/* =========================================================================
   Nexus · artifacts.css — chat-side cards + right-rail panel + diff viewer.
   Tokens are theme-agnostic: uses Studio-Soft (--surface*, --ink*, --accent)
   which the default theme aliases to --nx-* tokens.
   ========================================================================= */

/* ---- Inline card (replaces a long code/md block in chat) -------------- */
.nx-art-card {
  display: grid;
  grid-template-columns: 6px 28px 1fr auto;
  align-items: center;
  gap: 12px;
  margin: 10px 0;
  padding: 10px 14px 10px 0;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.nx-art-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, .12);
}
.nx-art-card .nx-art-accent {
  align-self: stretch;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep, var(--accent)));
  border-radius: 12px 0 0 12px;
}
.nx-art-card .nx-art-glyph {
  display: grid;
  place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--rule, var(--surface-3));
  font-family: var(--nx-font-mono, monospace);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.nx-art-card .nx-art-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.nx-art-card .nx-art-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nx-art-card .nx-art-sub {
  font-size: 11px;
  color: var(--ink-3, var(--ink-2));
  font-family: var(--nx-font-mono, monospace);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}
.nx-art-card .nx-art-open {
  margin-right: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--bg, #fff);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .03em;
  border: 0;
  cursor: pointer;
  transition: filter 120ms ease, transform 120ms ease;
}
.nx-art-card .nx-art-open:hover { filter: brightness(1.05); transform: translateY(-1px); }
.nx-art-card .nx-art-open:active { transform: translateY(0); }

/* ---- Right-side panel ------------------------------------------------- */
#nx-artifacts-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--nx-art-w, 480px);
  min-width: 320px;
  max-width: 80vw;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg, var(--surface)) 100%);
  border-left: 1px solid var(--rule, var(--surface-3));
  z-index: 40;
  transform: translateX(100%);
  transition: transform 320ms cubic-bezier(.2, .7, .1, 1);
  display: grid;
  grid-template-rows: auto auto 1fr;
  box-shadow: -10px 0 40px rgba(0, 0, 0, .25);
}
#nx-artifacts-panel[data-open="true"] { transform: translateX(0); }

.nx-art-resizer {
  position: absolute;
  top: 0; bottom: 0; left: -3px;
  width: 6px;
  cursor: col-resize;
  z-index: 1;
}
.nx-art-resizer::before {
  content: "";
  position: absolute;
  inset: 0 2px;
  background: transparent;
  transition: background 120ms ease;
}
.nx-art-resizer:hover::before { background: var(--accent-soft, var(--accent)); }

/* Frosted top bar */
.nx-art-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule, var(--surface-3));
  background: rgba(255, 255, 255, .04);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.nx-art-title-wrap {
  display: flex; flex-direction: column;
  min-width: 0; flex: 1;
}
.nx-art-topbar .nx-art-title {
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  color: var(--ink);
  font-family: var(--nx-font-display, inherit);
}
.nx-art-topbar .nx-art-kind-pill {
  font-family: var(--nx-font-mono, monospace);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft, rgba(0,0,0,.05));
  padding: 2px 8px;
  border-radius: 999px;
  align-self: flex-start;
  margin-top: 2px;
}
.nx-art-icon-btn {
  display: grid; place-items: center;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  color: var(--ink-2);
  font-size: 14px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}
.nx-art-icon-btn:hover { background: var(--surface-3); color: var(--ink); }

/* Tabs row + version pills */
.nx-art-bar2 {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--rule, var(--surface-3));
  overflow-x: auto;
  scrollbar-width: thin;
}
.nx-art-tab {
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 8px;
  color: var(--ink-2);
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
  transition: background 120ms ease, color 120ms ease;
  white-space: nowrap;
}
.nx-art-tab:hover { background: var(--surface-2); color: var(--ink); }
.nx-art-tab[aria-selected="true"] {
  background: var(--surface-2);
  color: var(--ink);
  border-color: var(--rule, var(--surface-3));
  box-shadow: inset 0 -2px 0 var(--accent);
}

.nx-art-vpill-row {
  display: flex; align-items: center; gap: 6px;
  margin-left: auto;
  padding-left: 10px;
}
.nx-art-vpill {
  font-family: var(--nx-font-mono, monospace);
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  color: var(--ink-2);
  cursor: pointer;
  transition: all 120ms ease;
}
.nx-art-vpill:hover { color: var(--ink); border-color: var(--accent-soft, var(--accent)); }
.nx-art-vpill[data-current="true"] {
  background: var(--accent);
  color: var(--bg, #fff);
  border-color: var(--accent);
}

/* Body */
.nx-art-body {
  position: relative;
  overflow: auto;
  padding: 16px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
}
.nx-art-body pre {
  margin: 0;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 10px;
  overflow: auto;
  font-family: var(--nx-font-mono, monospace);
  font-size: 12.5px;
  line-height: 1.55;
  white-space: pre;
}
.nx-art-body pre code { background: transparent; padding: 0; }
.nx-art-body textarea.nx-art-source {
  width: 100%;
  min-height: 60vh;
  padding: 14px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 10px;
  color: var(--ink);
  font-family: var(--nx-font-mono, monospace);
  font-size: 12.5px;
  line-height: 1.55;
  resize: vertical;
}
.nx-art-body .nx-art-md h1 { font-size: 22px; margin: 14px 0 8px; }
.nx-art-body .nx-art-md h2 { font-size: 18px; margin: 14px 0 8px; }
.nx-art-body .nx-art-md h3 { font-size: 15px; margin: 12px 0 6px; }
.nx-art-body .nx-art-md p  { margin: 6px 0; }
.nx-art-body .nx-art-md ul, .nx-art-body .nx-art-md ol { margin: 6px 0 6px 24px; }
.nx-art-body .nx-art-md code {
  background: var(--surface-2);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}

/* Versions panel */
.nx-art-versions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nx-art-versions .nx-art-vrow {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 8px;
  cursor: pointer;
}
.nx-art-versions .nx-art-vrow:hover { border-color: var(--accent-soft, var(--accent)); }
.nx-art-vrow .v {
  font-family: var(--nx-font-mono, monospace);
  font-size: 11px; color: var(--accent);
}
.nx-art-vrow .ts { font-size: 11px; color: var(--ink-3, var(--ink-2)); margin-left: auto; }

/* Diff viewer */
.nx-art-diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  font-family: var(--nx-font-mono, monospace);
  font-size: 12px;
  line-height: 1.5;
}
.nx-art-diff .col {
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 10px;
  overflow: hidden;
}
.nx-art-diff .col h4 {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3, var(--ink-2));
  padding: 6px 10px;
  border-bottom: 1px solid var(--rule, var(--surface-3));
  font-family: var(--nx-font-mono, monospace);
}
.nx-art-diff .lines { padding: 8px 0; }
.nx-art-diff .ln {
  display: grid;
  grid-template-columns: 36px 1fr;
  padding: 0 10px;
  white-space: pre;
  word-break: keep-all;
}
.nx-art-diff .ln.add { background: rgba(72, 187, 120, .12); }
.nx-art-diff .ln.del { background: rgba(245, 101, 101, .12); }
.nx-art-diff .ln .num { color: var(--ink-3, var(--ink-2)); user-select: none; }
.nx-art-diff .wadd { background: rgba(72, 187, 120, .35); border-radius: 2px; }
.nx-art-diff .wdel { background: rgba(245, 101, 101, .35); border-radius: 2px; }
.nx-art-diff .ln.add .num::before { content: "+"; }
.nx-art-diff .ln.del .num::before { content: "−"; }

/* Export tab */
.nx-art-export {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px;
}
.nx-art-export .nx-art-export-btn {
  padding: 14px 12px;
  background: var(--surface-2);
  border: 1px solid var(--rule, var(--surface-3));
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  transition: background 120ms ease, transform 120ms ease;
  display: flex; flex-direction: column; gap: 4px;
  color: var(--ink);
}
.nx-art-export .nx-art-export-btn:hover { background: var(--surface-3); transform: translateY(-1px); }
.nx-art-export .nx-art-export-btn .label { font-weight: 600; font-size: 13px; }
.nx-art-export .nx-art-export-btn .desc { font-size: 11px; color: var(--ink-3, var(--ink-2)); }

/* Tiny toast for "copied" / "sent" */
.nx-art-toast {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--bg, #fff);
  font-size: 12px;
  border-radius: 8px;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
}
.nx-art-toast[data-show="true"] { opacity: 1; transform: translateY(0); }

@media (max-width: 760px) {
  #nx-artifacts-panel { width: 100vw; max-width: 100vw; }
  .nx-art-resizer { display: none; }
}