/* Neuron Stream Lab — restyled to match Charles McAndrews portfolio
   Cream/sand/charcoal · terracotta accent · Fraunces × Inter × JetBrains Mono. */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500;600;650;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  color-scheme: light;
  --cream:    #F5EFE6;
  --paper:    #FAF7F1;
  --sand:     #E8DCC4;
  --sand-deep:#D9C9A8;
  --ink:      #2A2622;
  --ink-soft: #5C544A;
  --ink-muted:#8B7F6F;
  --rule:     rgba(42, 38, 34, 0.12);
  --accent:   #C25A3F;            /* terracotta */
  --accent-deep: #96412A;
  --display: 'Fraunces', Georgia, serif;
  --body:    'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; padding: 0; }
body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, select, textarea { font: inherit; color: inherit; }

::selection { background: var(--accent); color: var(--paper); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--sand-deep); border-radius: 999px; }

/* ── Top nav ──────────────────────────────────────────────────────────── */

.topnav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  background: rgba(245, 239, 230, 0.78);
  border-bottom: 1px solid var(--rule);
}
.topnav-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.topnav-mark {
  color: var(--ink); text-decoration: none; font-weight: 600;
}
.topnav-mark .dot { color: var(--accent); }
.topnav-links { display: flex; gap: 28px; color: var(--ink-soft); }
.topnav-links a {
  color: inherit; text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color .15s, border-color .15s;
}
.topnav-links a.is-current { color: var(--ink); border-bottom-color: var(--accent); }
.topnav-links a:hover { color: var(--ink); }
.topnav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink); text-decoration: none;
}
.topnav-cta-dot {
  width: 6px; height: 6px; background: var(--accent); border-radius: 50%;
}

/* ── Shell & header ───────────────────────────────────────────────────── */

.app-shell {
  width: min(1320px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 56px 0 96px;
}

.section-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.section-eyebrow .marker { color: var(--accent); }
.section-eyebrow .rule { flex: 1; height: 1px; background: var(--rule); margin-left: 8px; }

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 24px;
}
.topbar h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  font-variation-settings: '"opsz"' 144;
  font-size: clamp(40px, 5.6vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--ink);
  text-wrap: pretty;
}
.topbar h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}
.topbar p {
  margin: 14px 0 0;
  max-width: 620px;
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.run-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
  padding-bottom: 6px;
}

button {
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
  border-radius: 6px;
  min-height: 38px;
  padding: 0 14px;
  font-family: var(--body);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: border-color 140ms ease, background 140ms ease, color 140ms ease, transform 140ms ease;
}
button:hover { border-color: var(--ink-muted); background: #fffaf0; }
button:active { transform: translateY(1px); }
button:disabled { cursor: not-allowed; opacity: 0.5; }

button.primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
button.primary:hover { background: var(--accent); border-color: var(--accent); }

/* ── Workspace grid ───────────────────────────────────────────────────── */

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(0, 1.45fr) minmax(320px, 0.85fr);
  grid-template-areas:
    "controls output prediction"
    "controls heatmap heatmap"
    "controls attention attention";
  gap: 20px;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
}

.controls-panel { grid-area: controls; padding: 22px; display: flex; flex-direction: column; gap: 22px; }
.output-panel   { grid-area: output;   padding: 22px; min-height: 240px; }
.heatmap-panel  { grid-area: heatmap;  padding: 22px; }
.attention-panel{ grid-area: attention;padding: 22px; }
.prediction-panel{grid-area: prediction;padding: 22px; min-height: 240px; }

.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 12px; min-height: 28px; margin-bottom: 18px;
  padding-bottom: 14px; border-bottom: 1px solid var(--rule);
}
.section-head h2 {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.section-head h2::before {
  content: '§';
  color: var(--accent);
  margin-right: 8px;
  letter-spacing: 0;
}
.section-head .right {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

/* ── Status pill ─────────────────────────────────────────────────────── */

.status {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 24px; padding: 2px 10px;
  border-radius: 999px;
  background: var(--cream);
  border: 1px solid var(--rule);
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: lowercase;
}
.status::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ink-muted);
}
.status.running { color: var(--accent-deep); border-color: rgba(194, 90, 63, 0.35); background: rgba(194, 90, 63, 0.08); }
.status.running::before { background: var(--accent); animation: pulseDot 2.4s ease-in-out infinite; }

@keyframes pulseDot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(194, 90, 63, 0.35); }
  50%      { box-shadow: 0 0 0 6px rgba(194, 90, 63, 0); }
}

/* ── View switch (segmented control) ─────────────────────────────────── */

.view-switch {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.view-button {
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
}
.view-button.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
#activationScale {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
  margin-left: 6px;
}

/* ── Form fields ─────────────────────────────────────────────────────── */

.field { display: grid; gap: 8px; }
.field > span {
  display: flex; align-items: baseline; gap: 8px;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

textarea, select, input[type="number"] {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--cream);
  color: var(--ink);
  outline: none;
  transition: border-color 140ms, box-shadow 140ms, background 140ms;
}
textarea:hover, select:hover, input[type="number"]:hover { border-color: var(--ink-muted); }
textarea:focus, select:focus, input[type="number"]:focus, input[type="range"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(194, 90, 63, 0.14);
  background: var(--paper);
}

select { min-height: 38px; padding: 0 10px; appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' stroke='%235C544A' stroke-width='1.4' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat; background-position: right 10px center; background-size: 12px;
  padding-right: 30px;
}

textarea {
  min-height: 132px;
  resize: vertical;
  padding: 12px 14px;
  line-height: 1.55;
  font-family: var(--body);
  font-size: 14.5px;
}

input[type="number"] {
  min-height: 36px;
  padding: 0 10px;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

output {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 14px;
}
.field.compact { align-content: start; }

/* ── Readout cards ───────────────────────────────────────────────────── */

.readout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
.readout div {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; min-height: 36px; padding: 0 12px;
  border-radius: 4px;
  background: var(--cream);
}
.readout span {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.readout strong {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ── Output text & token trail ───────────────────────────────────────── */

.output-text {
  min-height: 96px;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--cream);
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--ink);
  white-space: pre-wrap;
  text-wrap: pretty;
}
.output-text:empty::before {
  content: 'output appears here as the model generates…';
  color: var(--ink-muted);
  font-family: var(--body);
  font-size: 14px;
  font-style: italic;
}

.token-trail {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 6px;
  margin-top: 16px;
  min-height: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}
.token-trail:empty { display: none; }
.token-chip {
  display: inline-flex; align-items: center;
  max-width: 100%;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 4px;
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

/* ── Canvases ────────────────────────────────────────────────────────── */

.panel canvas {
  display: block;
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--paper);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6),
              0 8px 24px -16px rgba(42,38,34,0.15);
}
#heatmapCanvas { height: min(44vh, 420px); min-height: 310px; }
#networkCanvas { height: min(62vh, 620px); min-height: 430px; }
#attentionCanvas { height: 260px; }
.panel canvas.is-hidden { display: none; }
.is-hidden { display: none; }

/* ── Predictions ─────────────────────────────────────────────────────── */

.prediction-list { display: grid; gap: 4px; }
.prediction-row {
  display: grid;
  grid-template-columns: minmax(60px, 0.55fr) minmax(100px, 1fr) 56px;
  align-items: center;
  gap: 12px;
  min-height: 34px;
  padding: 6px 4px;
  border-bottom: 1px solid var(--rule);
}
.prediction-row:last-child { border-bottom: none; }
.prediction-token {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.prediction-bar {
  height: 4px;
  border-radius: 999px;
  background: var(--sand);
  overflow: hidden;
}
.prediction-fill {
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 240ms ease;
}
.prediction-prob {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 11px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ── Footer note ─────────────────────────────────────────────────────── */

.footnote {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}
.footnote a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--rule); padding-bottom: 1px; }
.footnote a:hover { color: var(--accent); border-color: var(--accent); }

/* ── Panel captions ─────────────────────────────────────────────────── */
.panel-caption {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-family: var(--body);
  font-size: 13px;
  line-height: 1.55;
  text-wrap: pretty;
  max-width: 68ch;
}

/* ── Responsive ──────────────────────────────────────────────────────── */

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 300px minmax(0, 1fr);
    grid-template-areas:
      "controls output"
      "controls prediction"
      "heatmap heatmap"
      "attention attention";
  }
}

@media (max-width: 820px) {
  .app-shell { width: min(100vw - 20px, 720px); padding: 28px 0 64px; }
  .topnav-inner { padding: 12px 16px; gap: 12px; }
  .topnav-links { display: none; }
  .topbar { grid-template-columns: 1fr; }
  .run-controls { justify-content: flex-start; }
  .workspace { display: flex; flex-direction: column; }
  .control-grid { grid-template-columns: 1fr; }
  .prediction-row { grid-template-columns: minmax(56px, 0.7fr) minmax(90px, 1fr) 52px; }
}