/* ================= Qxern v6 interactive paper: custom layer ================= */
#qxern {
  --qx-gap: clamp(12px, 2.2vw, 22px);
  color: var(--foreground);
  width: 100%;
}
#qxern * { box-sizing: border-box; }
#qxern .qx-shell { display: grid; gap: var(--qx-gap); }
#qxern .qx-topbar, #qxern .qx-brand, #qxern .qx-actions, #qxern .qx-tabs,
#qxern .qx-chip-row, #qxern .qx-run-head, #qxern .qx-legend, #qxern .qx-node-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
#qxern .qx-topbar { justify-content: space-between; }
#qxern .qx-mark {
  display: grid; place-items: center; width: 34px; height: 34px;
  border-radius: 10px; color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}
#qxern .qx-brand-copy { display: grid; gap: 1px; }
#qxern .qx-brand-copy strong { font-weight: 500; letter-spacing: .08em; }
#qxern .qx-brand-copy span { color: var(--muted-foreground); }
#qxern .qx-hero {
  display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(250px, .65fr);
  gap: var(--qx-gap); align-items: end; padding: clamp(10px, 2vw, 18px) 0;
}
#qxern .qx-hero-copy { display: grid; gap: 12px; }
#qxern .qx-kicker { color: var(--muted-foreground); letter-spacing: .12em; text-transform: uppercase; }
#qxern .qx-hero h2 {
  margin: 0; max-width: 780px; font-size: clamp(1.7rem, 4.6vw, 3.1rem);
  line-height: 1.04; letter-spacing: -.045em; font-weight: 500;
}
#qxern .qx-hero p { margin: 0; max-width: 700px; color: var(--muted-foreground); }
#qxern .qx-note { border-left: 2px solid var(--primary); padding-left: 12px; color: var(--muted-foreground); }
#qxern .qx-tabs { border-bottom: 1px solid var(--border); padding-bottom: 10px; }
#qxern .qx-tab[aria-selected="true"] { color: var(--primary-foreground); background: var(--primary); }
#qxern .qx-view { display: none; }
#qxern .qx-view.is-active { display: grid; gap: var(--qx-gap); }

/* layout grids */
#qxern .qx-overview { grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); align-items: stretch; }
#qxern .qx-demo-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: stretch; }
@media (max-width: 900px) {
  #qxern .qx-hero, #qxern .qx-overview, #qxern .qx-demo-grid { grid-template-columns: 1fr; }
}

/* stat cards */
#qxern .qx-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--qx-gap); }
@media (max-width: 700px) { #qxern .qx-stats { grid-template-columns: 1fr; } }
#qxern .qx-stat-value { font-size: clamp(1.6rem, 3.4vw, 2.3rem); font-weight: 600; letter-spacing: -.03em; line-height: 1; }
#qxern .qx-stat-value small { font-size: .5em; font-weight: 400; color: var(--muted-foreground); }

/* demo chat */
#qxern .qx-code {
  margin: 0; padding: 14px; border-radius: 12px; overflow: auto; max-height: 340px;
  background: color-mix(in srgb, var(--card) 70%, transparent); border: 1px solid var(--border);
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .85rem; line-height: 1.5;
  white-space: pre;
}
#qxern .qx-chat {
  display: grid; gap: 10px; min-height: 320px; align-content: start;
  border: 1px solid var(--border); border-radius: 14px; padding: 14px;
  background: color-mix(in srgb, var(--card) 55%, transparent);
}
#qxern .qx-bubble {
  border-radius: 12px; padding: 10px 12px; max-width: 92%;
  border: 1px solid var(--border); background: color-mix(in srgb, var(--card) 90%, transparent);
}
#qxern .qx-bubble.qx-you { justify-self: end; background: color-mix(in srgb, var(--primary) 14%, var(--card)); }
#qxern .qx-bubble.qx-bot { justify-self: start; white-space: pre-wrap; line-height: 1.45; }
#qxern .qx-caret::after { content: "▍"; color: var(--primary); animation: qx-blink 1s steps(1) infinite; }
@keyframes qx-blink { 50% { opacity: 0; } }
#qxern .qx-meta { display: flex; gap: 8px; flex-wrap: wrap; }
#qxern .qx-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px;
  border-radius: 999px; border: 1px solid var(--border); font-size: .78rem; color: var(--muted-foreground);
  background: color-mix(in srgb, var(--card) 70%, transparent);
}
#qxern .qx-chip b { color: var(--foreground); font-weight: 500; }
#qxern .qx-sidecar {
  font-family: ui-monospace, monospace; font-size: .8rem; white-space: pre-wrap;
  border: 1px dashed var(--border); border-radius: 10px; padding: 8px 10px; color: var(--muted-foreground);
  background: color-mix(in srgb, var(--viz-series-3) 7%, transparent);
}
#qxern .qx-route-pill { font-size: .8rem; font-weight: 500; padding: 3px 10px; border-radius: 999px; }
#qxern .qx-route-pill.latent { background: color-mix(in srgb, var(--viz-series-1) 16%, transparent); color: var(--viz-series-1); }
#qxern .qx-route-pill.hybrid { background: color-mix(in srgb, var(--viz-series-4) 16%, transparent); color: var(--viz-series-4); }
#qxern .qx-route-pill.relay { background: color-mix(in srgb, var(--viz-series-2) 16%, transparent); color: var(--viz-series-2); }

/* compare cards */
#qxern .qx-compare-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--qx-gap); }
#qxern .qx-sys-name { font-weight: 500; letter-spacing: .04em; }
#qxern .qx-sys-answer { font-size: .88rem; line-height: 1.45; color: var(--muted-foreground); }

/* tables */
#qxern .qx-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; }
#qxern .qx-gate { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 10px; }
#qxern .qx-gate .ok { color: var(--viz-series-3); }
#qxern .qx-gate .fail { color: var(--viz-series-2); }

/* evidence images */
#qxern .qx-figure { display: grid; gap: 6px; }
#qxern .qx-figure img { width: 100%; border: 1px solid var(--border); border-radius: 12px; }
#qxern .qx-figure figcaption { color: var(--muted-foreground); font-size: .82rem; }

/* chart */
#qxern .qx-chart-card { display: grid; gap: 8px; }
#qxern .qx-chart { width: 100%; }
#qxern .qx-chart text { font-size: 10px; fill: var(--muted-foreground); }
#qxern .qx-chart .axis line, #qxern .qx-chart .axis path { stroke: var(--border); }
#qxern .qx-chart .bar { transition: opacity .15s ease; }
#qxern .qx-chart .bar:hover { opacity: .75; }
#qxern .qx-legend-row { display: flex; gap: 14px; flex-wrap: wrap; font-size: .78rem; color: var(--muted-foreground); }
#qxern .qx-swatch { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; }

/* misc */
#qxern .qx-src-list { display: grid; gap: 6px; }
#qxern .qx-src-list a { color: var(--primary); text-decoration: none; }
#qxern .qx-src-list a:hover { text-decoration: underline; }
#qxern .qx-two-col { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: var(--qx-gap); }
@media (max-width: 800px) { #qxern .qx-two-col { grid-template-columns: 1fr; } }
#qxern .qx-err { color: var(--viz-series-2); }

/* ============ variables + generic helpers (light/dark aware) ============ */
#qxern {
  --border: var(--color-border-primary, light-dark(rgb(0 0 0 / 14%), rgb(255 255 255 / 16%)));
  --card: var(--color-background-secondary, light-dark(rgb(245 245 245), rgb(42 42 42)));
  --foreground: var(--color-text-primary, light-dark(rgb(26 28 31), rgb(245 245 245)));
  --muted-foreground: var(--color-text-secondary, light-dark(rgb(26 28 31 / 62%), rgb(255 255 255 / 62%)));
  --primary: var(--color-text-info, light-dark(rgb(51 156 255), rgb(131 195 255)));
  --viz-series-1: var(--primary);
  --viz-series-2: light-dark(rgb(243 136 59), rgb(245 154 86));
  --viz-series-3: light-dark(rgb(93 201 119), rgb(116 213 139));
  --viz-series-4: light-dark(rgb(235 119 177), rgb(240 143 192));
  --viz-series-5: light-dark(rgb(155 121 236), rgb(170 145 239));
  color-scheme: light;
}
#qxern .text-small { font-size: .82rem; }
#qxern .text-muted { color: var(--muted-foreground); }
#qxern .qx-code-view { font-family: ui-monospace, monospace; font-size: .85rem; }

/* ============ generic buttons for chips ============ */
#qxern .btn {
  appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px;
  background: transparent; color: var(--foreground); cursor: pointer; font-size: .85rem;
  font-family: inherit; line-height: 1.3; transition: background .15s ease, color .15s ease;
}
#qxern .btn:not(:disabled):hover { border-color: var(--primary); color: var(--primary); }

/* arch diagram: semantic vs symbolic paths */
#qxern .qx-flow path { color: var(--border); }
#qxern .qx-flow path.qx-flow-side { color: var(--viz-series-3); }

/* ============ architecture diagram: simple text + arrow flow ============ */
#qxern .qx-arch { display: grid; gap: 12px; padding: 6px 0; }
#qxern .qx-flow-row {
  display: flex; align-items: stretch; justify-content: center; gap: 4px; flex-wrap: wrap;
}
#qxern .qx-node-mini {
  flex: 1 1 130px; min-width: 118px; max-width: 190px;
  display: grid; align-content: center; gap: 3px; padding: 10px 8px;
  border: 1px solid var(--border); border-radius: 10px;
  background: color-mix(in srgb, var(--card) 85%, transparent);
  text-align: center;
}
#qxern .qx-node-mini strong { font-weight: 500; font-size: .92rem; }
#qxern .qx-node-mini span { color: var(--muted-foreground); font-size: .78rem; }
#qxern .qx-node-mini.qx-node-lat { border-color: var(--viz-series-1); }
#qxern .qx-node-mini.qx-node-side { border-color: var(--viz-series-3); }
#qxern .qx-arrow {
  align-self: center; font-size: 1.35rem; line-height: 1; color: var(--muted-foreground);
  padding: 0 1px; user-select: none;
}
#qxern .qx-arrow.qx-arrow-side { color: var(--viz-series-3); }
#qxern .qx-flow-row-side { padding-left: 22%; }
#qxern .qx-flow-row-side .qx-node-mini { flex: 0 1 170px; }
@media (max-width: 720px) { #qxern .qx-flow-row-side { padding-left: 0; } }

/* ============ demo chips: clean pills ============ */
#qxern .qx-chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
#qxern #qx-samples { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
#qxern #qx-samples .qx-sample-chip { justify-content: center; }
#qxern .qx-sample-chip, #qxern .qx-q-chip {
  appearance: none; -webkit-appearance: none; margin: 0;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid #d4d8df; border-radius: 999px;
  background: #f2f4f7; color: #1f2328; cursor: pointer; font-size: .85rem; font-family: inherit;
  line-height: 1.3; padding: 8px 14px; transition: border-color .15s ease, background .15s ease, color .15s ease;
}
#qxern .qx-sample-chip:hover, #qxern .qx-q-chip:hover {
  border-color: #2f8cff; color: #2f8cff;
}
#qxern .qx-sample-chip[aria-pressed="true"] {
  background: #2f8cff; border-color: #2f8cff; color: #fff; font-weight: 500;
}
#qxern .qx-q-chip[aria-pressed="true"] {
  background: #eb77b1; border-color: #eb77b1; color: #fff; font-weight: 500;
}
/* questions: even grid of chips (neat rows on any screen, no ragged wrap) */
#qxern #qx-questions { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 8px; }
#qxern #qx-questions .qx-q-chip {
  width: 100%; justify-content: flex-start; text-align: left; border-radius: 10px;
  white-space: normal; min-height: 38px;
}
#qxern .qx-q-chip { max-width: 100%; }

/* ============ mobile: this template's bulma keeps columns side-by-side ============ */
@media (max-width: 900px) {
  #qxern .column { width: 100% !important; flex: none !important; }
  #qxern .qx-flow-row-side { padding-left: 0; }
}