:root {
  --bg:      #0a0a0a;
  --surface: oklch(0.13 0.005 260);
  --fg:      oklch(0.92 0 0);
  --muted:   oklch(0.40 0 0);
  --border:  oklch(1 0 0 / 0.08);
  --accent:  oklch(0.77 0.18 200);
  --accent-dim: oklch(0.55 0.12 200);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: 'JetBrains Mono', 'IBM Plex Mono', 'Berkeley Mono', monospace;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

canvas { display: block; }

.scanlines {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    oklch(0 0 0 / 0.03) 2px,
    oklch(0 0 0 / 0.03) 4px
  );
}

.input-container {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px;
  min-width: min(420px, calc(100vw - 24px));
  max-width: 640px;
  width: clamp(320px, 40vw, 640px);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
  pointer-events: auto;
}

.bottom-bar {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  pointer-events: none;
}

.input-container:focus-within {
  border-color: var(--accent-dim);
  box-shadow: 0 0 24px oklch(0.77 0.18 200 / 0.08);
}

.input-container.active {
  border-color: var(--accent-dim);
  box-shadow: 0 0 32px oklch(0.77 0.18 200 / 0.12);
}

.prompt {
  color: var(--accent);
  font-size: 18px;
  font-weight: 500;
  user-select: none;
  flex-shrink: 0;
  margin-right: 8px;
}

.input-wrapper {
  position: relative;
  flex: 1;
  min-width: 0;
}

.formula-input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--fg);
  font-family: inherit;
  font-size: 18px;
  font-weight: 400;
  line-height: 1.5;
  caret-color: var(--accent);
  letter-spacing: 0;
}

.formula-input::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.ghost-text {
  position: absolute;
  top: 0;
  left: 0;
  color: var(--muted);
  font-size: 18px;
  font-weight: 400;
  line-height: 1.5;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.2s ease;
}

.ghost-text.visible { opacity: 0.5; }
.ghost-text .dim { opacity: 0.35; }

.pipeline {
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}

.pipeline.visible { opacity: 0.65; }

.pipe-stage {
  background: oklch(0.13 0.005 260 / 0.5);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color 0.5s ease, border-color 0.5s ease, background 0.5s ease;
}

.pipe-stage.highlight {
  color: var(--accent);
  border-color: oklch(1 0 0 / 0.18);
  background: oklch(0.15 0.02 200 / 0.35);
}

.pipe-arrow {
  color: var(--muted);
  font-size: 11px;
  opacity: 0.6;
}

.annotation {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.01em;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
  text-align: center;
}

.annotation.visible { opacity: 0.65; }

.status-line {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.02em;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.status-line.visible { opacity: 1; }
.status-line.error { color: oklch(0.50 0.10 20); }

.info-card {
  position: fixed;
  z-index: 20;
  background: oklch(0.15 0.005 260 / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  padding: 10px 14px;
  min-width: 220px;
  max-width: 260px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: inset 2px 0 0 var(--accent-dim);
}

.info-card.visible {
  opacity: 1;
  pointer-events: auto;
}

.info-card-word {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.info-card-desc {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.5;
  padding-bottom: 6px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
  max-height: 4.5em;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-dim) transparent;
}

.info-card-desc::-webkit-scrollbar {
  width: 4px;
}

.info-card-desc::-webkit-scrollbar-track {
  background: transparent;
}

.info-card-desc::-webkit-scrollbar-thumb {
  background: var(--accent-dim);
  border-radius: 2px;
}

.info-card-neighbors-label {
  padding: 8px 0 4px;
  font-size: 10px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.info-card-list {
  list-style: none;
  padding-bottom: 6px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.info-card-list:empty { padding-bottom: 0; margin-bottom: 0; border-bottom: none; }

.info-card-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.01em;
}

.info-card-list li .label { color: var(--fg); font-size: 12px; }
.info-card-list li .score { color: var(--accent-dim); font-size: 12px; font-variant-numeric: tabular-nums; }

.info-card-source {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.01em;
  display: none;
}

.bottom-buttons {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10;
  display: flex;
  gap: 8px;
}

.bottom-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: oklch(0.12 0 0 / 0.7);
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease, border-color 0.3s ease;
}

.bottom-btn:hover {
  color: var(--fg);
  border-color: var(--muted);
}

.bottom-btn.clear-active {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.bottom-btn:focus-visible {
  outline: 2px solid var(--accent-dim);
  outline-offset: 2px;
}
.trail-count {
  position: fixed;
  top: 44px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.03em;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.trail-count.visible { opacity: 0.7; }

.observatory-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: oklch(0 0 0 / 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.observatory-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.observatory-panel {
  background: oklch(0.11 0.005 260 / 0.97);
  border: 1px solid var(--border);
  max-width: 680px;
  width: 95%;
  max-height: 85vh;
  overflow-y: auto;
}

.observatory-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 500;
}

.observatory-close {
  color: var(--muted);
  cursor: default;
}

.observatory-close:hover { color: var(--accent); }

.observatory-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.observatory-section:last-child { border-bottom: none; }

.observatory-section-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-bottom: 10px;
  font-weight: 500;
}

.observatory-formula-bar {
  display: flex;
  gap: 6px;
  align-items: baseline;
  flex-wrap: wrap;
}

.observatory-formula-bar .observatory-token { color: var(--muted); }
.observatory-formula-bar .observatory-op { color: var(--accent); }
.observatory-formula-bar .observatory-arrow { color: var(--accent); }
.observatory-formula-bar .observatory-result { color: var(--fg); }

.observatory-heatmap-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.observatory-heatmap-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.observatory-heatmap-name {
  width: 80px;
  text-align: right;
  color: var(--muted);
  font-size: 11px;
  flex-shrink: 0;
}

.observatory-cells {
  display: flex;
  gap: 1px;
}

.observatory-cell {
  width: 12px;
  height: 14px;
  background: var(--accent-dim);
}

.observatory-bin-labels {
  display: flex;
  gap: 1px;
  padding-left: 88px;
  font-size: 9px;
  color: var(--border);
}

.observatory-bin-labels span {
  width: 12px;
  text-align: center;
}

.observatory-arithmetic {
  color: var(--muted);
  font-size: 12px;
}

.observatory-arithmetic .observatory-sym { color: var(--accent); }

.observatory-arithmetic .observatory-cosine {
  color: var(--accent-dim);
  font-size: 10px;
  margin-left: 8px;
}

.observatory-pca-chip {
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
}

.observatory-pca-chip span { color: var(--accent); }

.observatory-neighbors-table {
  width: 100%;
}

.observatory-neighbor-row {
  display: flex;
  align-items: center;
  padding: 3px 0;
}

.observatory-neighbor-row:nth-child(even) {
  background: oklch(0.13 0.005 260);
}

.observatory-neighbor-rank {
  width: 28px;
  color: var(--muted);
  text-align: right;
  flex-shrink: 0;
}

.observatory-neighbor-name {
  width: 180px;
  flex-shrink: 0;
  padding-left: 8px;
  color: var(--fg);
}

.observatory-neighbor-bar-wrap {
  flex: 1;
  padding-left: 8px;
}

.observatory-neighbor-bar {
  height: 10px;
  background: var(--accent-dim);
}

.observatory-neighbor-score {
  width: 50px;
  text-align: right;
  color: var(--accent-dim);
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.observatory-footer {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.observatory-footer-sep { color: var(--border); }
.observatory-footer-link { color: var(--accent); }

@keyframes blink {
  50% { opacity: 0; }
}