@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;600&family=Crimson+Pro:ital,wght@0,300;0,600;1,300&display=swap');

/* ── Design tokens ───────────────────────────────────────────── */
:root {
  --bg:      #04070f;
  --panel:   #080e1c;
  --border:  #16213a;
  --accent:  #00e5ff;
  --accent2: #e040fb;
  --accent3: #69f0ae;
  --text:    #b8cce8;
  --muted:   #3a4d70;
}

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

/* ── Page shell ──────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ──────────────────────────────────────────────────── */
header {
  padding: 9px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--panel);
  flex-shrink: 0;
}
header h1 {
  font-family: 'Crimson Pro', serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
}
header .sub {
  font-size: 12px;
  color: var(--muted);
  font-family: 'Crimson Pro', serif;
  font-style: italic;
}

/* ── Layout ──────────────────────────────────────────────────── */
.main   { display: flex; flex: 1; overflow: hidden; }

/* ── Sidebar ─────────────────────────────────────────────────── */
.sidebar {
  width: 310px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  overflow-y: auto;
}

/* Section label */
.slabel {
  font-size: 10px;
  color: #6a80a8;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  margin-bottom: 6px;
}

/* ── n-shell selector row above orbital grid ──────────────────── */
.nrow { display: flex; gap: 3px; margin-bottom: 4px; }
.nbtn {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 3px 0;
  cursor: pointer;
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  text-align: center;
  border-radius: 2px;
  transition: all .12s;
}
.nbtn:hover  { border-color: var(--accent); color: var(--accent); }
.nbtn.active { background: var(--accent); color: #000; border-color: var(--accent); font-weight: 700; }

/* ── Orbital grid buttons ─────────────────────────────────── */
.ogrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(38px, 1fr)); gap: 4px; min-height: 28px; }
.obtn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 2px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  text-align: center;
  transition: all .12s;
  border-radius: 2px;
}
.obtn:hover  { border-color: var(--accent); color: var(--accent); }
.obtn.active { background: var(--accent); color: #000; border-color: var(--accent); font-weight: 600; }

/* ── Slider rows — horizontal: label · · · [slider] · val ───── */
.crow {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
}
.crow label {
  width: 78px;          /* fixed — all sliders start at the same x */
  flex-shrink: 0;
  font-size: 11px;
  color: #8aa0c8;
  white-space: nowrap;
  line-height: 1;
}
.crow-val {
  width: 38px;          /* fixed — all sliders end at the same x */
  flex-shrink: 0;
  font-size: 11px;
  color: var(--accent);
  text-align: right;
  white-space: nowrap;
}

/* Range input fills remaining space */
input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 20px;
  display: block;
  accent-color: var(--accent);
  cursor: pointer;
  padding: 0;
}

/* ── General buttons ─────────────────────────────────────────── */
.btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  transition: all .12s;
  border-radius: 2px;
  width: 100%;
}
.btn:hover        { border-color: var(--accent3); color: var(--accent3); }
.btn.active       { border-color: var(--accent); color: var(--accent); background: rgba(0,229,255,.08); }
.btn.active:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,229,255,.14); }
.btn.danger:hover { border-color: #ff5252; color: #ff5252; }


/* ── Stats grid ──────────────────────────────────────────────── */
.stat-grid { display: grid; gap: 4px; }
.stat {
  display: flex;
  justify-content: space-between;
  padding: 5px 8px;
  background: #060b16;
  border-radius: 2px;
  border: 1px solid var(--border);
}
.stat-label { color: #7a90b8; font-size: 11px; }
.stat-val   { color: var(--accent); font-size: 12px; font-weight: 600; }
.stat-val.ok   { color: var(--accent3); }
.stat-val.warn { color: #ffb74d; }

/* Expert rows: hidden until .show-expert is on the grid (.stat comes first so we must be after it) */
#expertRows { display: contents; }
.expert-stat { display: none; }
.stat-grid.show-expert .expert-stat { display: flex; }

/* ── Selects ─────────────────────────────────────────────────── */
select {
  background: #060b16;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  width: 100%;
  cursor: pointer;
  border-radius: 2px;
}

/* ── View toggle + palette on one line ──────────────────────── */
.view-pal-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.view-pal-row .vtabs {
  flex: 1;
  margin-bottom: 0;
}

/* ── View-mode tabs ──────────────────────────────────────────── */
.vtabs {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 4px;
}
.vtab {
  flex: 1;
  padding: 6px 4px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  background: transparent;
  border: none;
  border-right: 1px solid var(--border);
  color: #6a80a8;
  cursor: pointer;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: .5px;
  transition: all .12s;
}
.vtab:last-child { border-right: none; }
.vtab:hover      { background: var(--border); color: var(--text); }
.vtab.active     { background: var(--accent); color: #000; font-weight: 600; }

/* ── Canvas area ─────────────────────────────────────────────── */
.canvas-wrap { flex: 1; position: relative; overflow: hidden; }
canvas { display: block; width: 100%; height: 100%; }

/* ── Overlays ────────────────────────────────────────────────── */
.info {
  position: absolute;
  bottom: 10px; left: 10px;
  background: rgba(8,14,28,.93);
  border: 1px solid var(--border);
  padding: 9px 12px;
  font-size: 11px;
  line-height: 1.9;
  color: #8aa0c8;
  max-width: 280px;
  border-radius: 2px;
  backdrop-filter: blur(4px);
}
.info .ket {
  font-family: 'Crimson Pro', serif;
  font-size: 15px;
  color: var(--accent2);
  display: block;
  margin-bottom: 3px;
}

.hint {
  position: absolute;
  top: 10px; left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  color: #8aa0c8;
  background: rgba(8,14,28,.85);
  padding: 5px 13px;
  border-radius: 2px;
  border: 1px solid var(--border);
  white-space: nowrap;
  pointer-events: none;
}

.legend {
  position: absolute;
  top: 10px; right: 10px;
  background: rgba(8,14,28,.93);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 2px;
  font-size: 11px;
  line-height: 2.3;
  color: #8aa0c8;
}
.lrow { display: flex; align-items: center; gap: 9px; }
.lsw  { width: 28px; height: 10px; border-radius: 2px; flex-shrink: 0; }
.lrow-btn {
  all: unset;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  box-sizing: border-box;
  padding: 0 4px 0 0;
  border-radius: 3px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  color: #8aa0c8;
  transition: background .12s;
}
.lrow-btn:hover { background: rgba(0,229,255,.08); color: #c0d4f8; }
.leg-colpop {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--panel, #0d1428);
  border: 1px solid var(--border, #1e2f58);
  border-radius: 8px;
  padding: 8px 10px;
  gap: 7px;
  z-index: 310;
  box-shadow: 0 4px 20px rgba(0,0,0,.65);
}
.leg-colpop.open { display: flex; }
.leg-col-opt {
  all: unset;
  cursor: pointer;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid transparent;
  box-shadow: 0 0 4px rgba(0,0,0,.5);
  transition: border-color .15s, transform .1s;
}
.leg-col-opt:hover { transform: scale(1.2); }
.leg-col-opt.sel   { border-color: #fff; }

.leg-pal-pop {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--panel, #0d1428);
  border: 1px solid var(--border, #1e2f58);
  border-radius: 8px;
  min-width: 170px;
  z-index: 310;
  box-shadow: 0 4px 20px rgba(0,0,0,.65);
  overflow: hidden;
}
.leg-pal-pop.open { display: block; }


/* ── Sidebar resize handle ───────────────────────────────────── */
.sidebar-resize {
  width: 5px;
  flex-shrink: 0;
  cursor: col-resize;
  background: var(--border);
  transition: background .15s;
  z-index: 10;
}
.sidebar-resize:hover,
.sidebar-resize.dragging { background: rgba(0,229,255,.45); }

/* ── Palette picker button ───────────────────────────────────── */
.pal-row { display: flex; flex-direction: column; gap: 0; }

.pal-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  width: 100%;
  background: #060b16;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  cursor: pointer;
  border-radius: 2px;
  text-align: left;
  transition: border-color .12s;
  white-space: nowrap;
}
.pal-btn:hover { border-color: var(--accent); }

.pal-arrow { margin-left: auto; opacity: .5; font-size: 9px; }

.pal-swatch {
  width: 52px;
  height: 11px;
  border-radius: 2px;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,.12);
}

/* ── Palette popup ───────────────────────────────────────────── */
.pal-popup {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 3px);
  min-width: 140px;
  background: #0c1428;
  border: 1px solid var(--border);
  border-radius: 3px;
  z-index: 200;
  box-shadow: 0 8px 28px rgba(0,0,0,.7);
  overflow: hidden;
}
.pal-popup.open { display: block; }

.pal-opt {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  cursor: pointer;
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text);
  transition: background .1s;
}
.pal-opt:hover   { background: rgba(0,229,255,.08); color: var(--accent); }
.pal-opt.selected { background: rgba(0,229,255,.05); color: var(--accent); font-weight: 600; }

/* ── Light theme ─────────────────────────────────────────────── */
body.light {
  --bg:      #f0f4ff;
  --panel:   #eef1f9;
  --border:  #c8d0e8;
  --accent:  #0066cc;
  --accent2: #8800bb;
  --accent3: #007744;
  --text:    #1a2540;
  --muted:   #6070a0;
}
body.light .stat        { background: #e2e8f8; }
body.light select,
body.light .pal-btn     { background: #f0f4ff; color: #1a2540; border-color: #c8d0e8; }
body.light .pal-popup   { background: #eef1f9; border-color: #c8d0e8; }
body.light .pal-opt     { color: #1a2540; }
body.light .pal-opt:hover    { background: rgba(0,102,204,.10); color: #0066cc; }
body.light .pal-opt.selected { background: rgba(0,102,204,.07); color: #0066cc; }
body.light .info,
body.light .legend,
body.light .hint        { background: rgba(238,241,249,0.96); color: #1a2540; border-color: #c8d0e8; }
body.light .vtab        { background: #e2e8f8; color: #1a2540; border-color: #c8d0e8; }
body.light .vtab.active { background: #0066cc; color: #fff; }
body.light .lrow-btn    { color: #3a4d70; }
body.light .lrow-btn:hover { background: rgba(0,102,204,.08); color: #0066cc; }
body.light .leg-colpop  { background: #eef1f9; border-color: #c8d0e8; }
body.light .leg-pal-pop { background: #eef1f9; border-color: #c8d0e8; }
body.light .btn         { background: #e2e8f8; color: #1a2540; border-color: #c8d0e8; }
body.light .btn.active  { background: rgba(0,102,204,.12); border-color: #0066cc; color: #0066cc; }
body.light .btn.danger  { background: #fce8e8; color: #cc2200; border-color: #e8b0a8; }
body.light .slabel      { color: #0066cc; border-color: #c8d0e8; }
body.light input[type=range] { accent-color: #0066cc; }

/* ════════════════════════════════════════════════════════════════
   Spin (Pauli–Bohm) Section
   ════════════════════════════════════════════════════════════════ */
#spinSection {
  border-top: 1px solid var(--border);
  padding-top: 4px;
}

.spin-slabel {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.spin-slabel span {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent);
}

#spinSubSection {
  margin-top: 4px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

#spinModeRow {
  gap: 8px;
  align-items: center;
  font-size: 10px;
}
#spinModeRow label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

/* Keep the φ/θ sliders hidden until product mode is active —
   visibility is controlled from JS via _syncSpinUI() */

/* Spin legend rows */
.spin-lrow {
  position: relative;         /* needed for the hidden colour-input sibling */
}
.spin-lrow .lrow-btn {
  width: 100%;
}

/* Light-mode override for spin label */
body.light .spin-slabel span { color: #0066cc; }

/* Spin diagnostics in expert panel */
.spin-diag {
  grid-column: 1 / -1;          /* full-width row (like expert-stat) */
}
.spin-diag .stat-label {
  font-size: 9px;
  color: var(--accent);
  opacity: 0.85;
}
.spin-diag .stat-val {
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}
.spin-diag .stat-val.ok   { color: #00e5a0; }
.spin-diag .stat-val.warn { color: #ff9040; }