:root {
  --bg: #070a12;
  --panel: #0c1220;
  --panel-2: #121c32;
  --border: #243049;
  --text: #e8eefc;
  --muted: #93a4c3;
  --accent: #22d3ee;
  --side: min(360px, 40vw);
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

#app {
  display: grid;
  grid-template-columns: var(--side) 1fr;
  height: 100%;
}

.side {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--panel);
  min-width: 0;
  overflow: hidden;
  min-height: 0;
}

.side-top {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  padding: 0.85rem 1rem 0.65rem;
  border-bottom: 1px solid var(--border);
}

.nav-btns {
  display: flex;
  gap: 0.3rem;
  flex-shrink: 0;
}

.side-top h1 {
  margin: 0;
  font-size: 1.05rem;
}
.side-top p {
  margin: 0.15rem 0 0;
  font-size: 0.75rem;
  color: var(--muted);
}

.mode-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid var(--border);
}

.side-tabs {
  display: flex;
  gap: 0.2rem;
  padding: 0.35rem 0.55rem;
  border-bottom: 1px solid var(--border);
}
.side-tab {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  border-radius: 0.35rem;
  padding: 0.3rem 0.55rem;
  font-size: 0.75rem;
  cursor: pointer;
}
.side-tab:hover { color: var(--text); }
.side-tab.active {
  color: var(--text);
  background: var(--panel-2);
  border-color: var(--border);
}

.icon-btn {
  width: 2rem;
  height: 2rem;
  border-radius: 0.4rem;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  cursor: pointer;
  display: grid;
  place-items: center;
}
.icon-btn:hover:not(:disabled) { color: var(--accent); border-color: rgba(34,211,238,0.4); }
.icon-btn:disabled { opacity: 0.35; cursor: default; }

.crumb {
  flex: 1;
  min-width: 0;
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mode-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 0.4rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}
.mode-btn:hover:not(:disabled) { color: var(--text); }
.mode-btn.active {
  color: #0b1020;
  background: var(--accent);
  border-color: var(--accent);
}
.mode-btn:disabled { opacity: 0.35; cursor: default; }

.mode-badge {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--muted);
}

.inspect {
  flex: 1;
  overflow: auto;
  padding: 0.85rem 1rem 1.5rem;
  min-height: 0;
}

.ins-title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}
.ins-en {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text);
}
.ins-h {
  margin: 0.85rem 0 0.35rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.muted { color: var(--muted); font-size: 0.85rem; }

.ins-sym {
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.55rem;
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--accent);
  background: #080e1a;
  border-radius: 0 0.4rem 0.4rem 0;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.65rem;
}
.badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
}
.badge.dim {
  background: #172038;
  color: var(--accent);
  font-weight: 600;
  text-transform: none;
}

.formula-line {
  background: #080e1a;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  padding: 0.55rem 0.65rem;
  margin: 0 0 0.65rem;
}
.formula-line .flab {
  display: block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
.formula-line code {
  font-family: "Cambria Math", "Times New Roman", ui-serif, serif;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: #f1f5f9;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.75rem;
  margin: 0.5rem 0 1rem;
  font-size: 0.75rem;
  color: var(--muted);
}
.legend i {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  margin-right: 0.3rem;
  vertical-align: middle;
}
.legend i.ring {
  background: transparent;
  border: 2px solid;
  width: 0.6rem;
  height: 0.6rem;
  box-sizing: border-box;
}

.doc-list {
  margin: 0 0 0.85rem;
  padding-left: 1.15rem;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.doc-list li { margin-bottom: 0.35rem; }
.doc-list kbd {
  font-size: 0.72rem;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  padding: 0.05rem 0.3rem;
  background: var(--panel-2);
  color: var(--text);
}

.premise-list {
  margin: 0 0 0.35rem;
  padding-left: 1.2rem;
  color: var(--muted);
}
.premise-list li { margin-bottom: 0.3rem; }
.premise-list button {
  border: none;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font-size: 0.82rem;
  padding: 0.15rem 0;
}
.premise-list button:hover .q-sym { text-decoration: underline; }

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}
.field label {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.field .val { color: var(--accent); text-transform: none; letter-spacing: 0; }
.field select, .field input[type="range"] {
  width: 100%;
  background: #0a1224;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--text);
  padding: 0.4rem 0.5rem;
  font-size: 0.85rem;
}
.field input[type="range"] { padding: 0; height: 1.5rem; }
.check {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0.5rem 0 0.85rem;
  cursor: pointer;
}
.check input[type="checkbox"] { width: 24px; height: 24px; margin: -2.5px -2px; flex-shrink: 0; align-self: center; }

.step-card {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--panel-2);
  padding: 0.65rem 0.75rem;
  margin-bottom: 0.75rem;
}

.step-list {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  max-height: 14rem;
  overflow: auto;
}
.step-list li {
  margin-bottom: 0.3rem;
}
.step-list button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: #0a1224;
  color: var(--muted);
  border-radius: 0.4rem;
  padding: 0.4rem 0.5rem;
  font-size: 0.78rem;
  cursor: pointer;
  line-height: 1.35;
}
.step-list li.on button {
  border-color: var(--accent);
  color: var(--text);
}
.step-list .sn {
  display: inline-block;
  min-width: 1.2rem;
  color: var(--accent);
  font-weight: 700;
}
.step-list .sr {
  color: var(--text);
  font-weight: 600;
}
.step-list code {
  font-family: "Cambria Math", ui-serif, serif;
  font-size: 0.8rem;
  color: var(--muted);
}

.quick-list, .link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.quick-list li, .link-list li { margin-bottom: 0.3rem; }
.quick-list button, .link-list button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  border-radius: 0.4rem;
  padding: 0.4rem 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  line-height: 1.35;
}
.quick-list button:hover, .link-list button:hover {
  border-color: rgba(34,211,238,0.4);
  color: var(--text);
}
.q-sym {
  font-family: "Cambria Math", "Times New Roman", serif;
  color: var(--accent);
  font-weight: 600;
  margin-right: 0.35rem;
}
.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.link-list li { margin: 0; }
.link-list button {
  width: auto;
  padding: 0.35rem 0.55rem;
}

.ins-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 0.4rem;
  min-height: 44px;
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
  cursor: pointer;
}
.btn:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: 0.35; cursor: default; }
.btn.primary {
  background: linear-gradient(135deg, #2b4c9b, #1f6f8b);
  border: none;
  color: #fff;
}

/* Stage */
.stage {
  position: relative;
  min-width: 0;
  background: radial-gradient(ellipse 70% 55% at 50% 42%, #10182c 0%, var(--bg) 72%);
}

.graph-bar {
  position: absolute;
  z-index: 5;
  top: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}
.graph-bar-right {
  display: flex;
  gap: 0.35rem;
  pointer-events: auto;
}
.graph-bar .btn { pointer-events: auto; }
.graph-bar .btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
}
.muted.small { font-size: 0.8rem; line-height: 1.45; }
.graph-tag {
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(12,18,32,0.75);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  backdrop-filter: blur(8px);
}

#cy {
  position: absolute;
  inset: 0;
}

.empty-graph {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  color: var(--muted);
  padding: 2rem;
  gap: 0.5rem;
  font-size: 0.9rem;
}
.empty-graph code {
  font-family: "Cambria Math", serif;
  color: var(--text);
  display: block;
  margin: 0.5rem 0;
}

.status-bar {
  position: absolute;
  z-index: 5;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.65rem;
  font-size: 0.72rem;
  color: var(--muted);
  background: rgba(12,18,32,0.72);
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  padding: 0.35rem 0.6rem;
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  backdrop-filter: blur(8px);
}

.grow-panel, .filter-panel {
  padding: 0.65rem 0.85rem 0.55rem;
  border-bottom: 1px solid var(--border);
}
.field-inline {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.55rem;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.field-inline select {
  width: 100%;
  background: #0a1224;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--text);
  padding: 0.4rem 0.5rem;
  font-size: 0.85rem;
  text-transform: none;
  letter-spacing: 0;
}
.grow-btns {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 0.45rem;
}
.grow-btns .btn { flex: 1; }
.grow-btns .btn.active {
  border-color: var(--accent);
  color: #0b1020;
  background: var(--accent);
}
.filter-panel label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.filter-panel .hint {
  margin: 0.3rem 0 0.45rem;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
  line-height: 1.4;
}
.filter-panel input[type="range"] {
  width: 100%;
  height: 1.5rem;
  padding: 0;
  accent-color: var(--accent);
}
.elegance-ramp {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0.25rem 0 0.35rem;
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.ramp-bar {
  flex: 1;
  height: 6px;
  border-radius: 99px;
  background: linear-gradient(90deg, #64748b, #22d3ee, #fbbf24, #f43f5e);
}
.best-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.best-list li { margin-bottom: 0.35rem; }
.best-list button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  border-radius: 0.4rem;
  padding: 0.45rem 0.55rem;
  font-size: 0.8rem;
  cursor: pointer;
  display: grid;
  grid-template-columns: 3.1rem 1fr;
  grid-template-rows: auto auto;
  column-gap: 0.45rem;
  row-gap: 0.1rem;
}
.best-list button:hover { border-color: rgba(34,211,238,0.45); color: var(--text); }
.best-score {
  grid-row: 1 / span 2;
  font-weight: 800;
  font-size: 1rem;
  align-self: center;
  font-variant-numeric: tabular-nums;
}
.best-f {
  color: var(--text);
  font-family: "Cambria Math", "Times New Roman", serif;
}

@media (max-width: 800px) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) minmax(240px, 46vh);
  }
  .stage { order: 1; min-height: 0; }
  .side {
    order: 2;
    border-right: none;
    border-top: 1px solid var(--border);
    overflow-y: auto;
    max-height: 46vh;
  }
  :root { --side: 100%; }
}

/* keep the last controls clear of the floating share and Request buttons on phones */
@media (max-width: 800px) { .side { padding-bottom: 76px; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}