/* ═══════════════════════════════════════════════════════════
   RNSpectraX™ — design tokens
   Palette note: the identity is drawn from the instrument world
   this app serves. Plum-violet is the dark field of a Raman map;
   gold is the plasmonic metal that makes SERS work. The Stokes /
   anti-Stokes pair (warm red / cool cyan) marks the two directions
   a scattered photon can shift.
═══════════════════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  color-scheme: light;

  /* Surfaces */
  --bg: #f4f2f8;
  --surface: #ffffff;
  --surface-2: #f7f5fb;
  --surface-3: #efeaf7;

  /* Borders */
  --border: #e6e1ef;
  --border-strong: #d4cce3;

  /* Text */
  --text: #16101f;
  --muted: #6a6180;
  --faint: #6f6685;   /* was #9a92ac — only 2.67:1 on white, below AA */

  /* Accent — plum violet (kept high-contrast for controls) */
  --accent: #6127a8;
  --accent-hover: #4e1f88;
  --accent-soft: #f3ecfc;
  --accent-soft-border: #ddccf5;

  /* Brand metal — plasmonic gold, used on dark chrome and badges */
  --gold: #c0870f;
  --gold-bright: #e0a82e;
  --gold-soft: #fdf5e2;

  /* Spectral signal pair */
  --stokes: #d1435f;
  --anti-stokes: #1f8fa8;

  /* Text that sits on top of a filled accent, and the "solid" button pair.
     Both flip with the theme — a hardcoded #fff turns invisible on a light
     accent once the workspace goes dark. */
  --on-accent: #ffffff;
  --solid-bg: #16101f;
  --solid-fg: #ffffff;

  /* Inline sub-headers, helper text and inset cards inside the panels. */
  --label: #5a5170;
  --hint: #6a6180;
  --inset: #fbfaff;

  --success: #0b7a54;
  --success-soft: #e8f8f1;
  --danger: #c62a2a;
  --danger-soft: #fdf0f0;
  --warning: #b5760a;

  /* Chrome (topbar) */
  --chrome: #16101f;
  --chrome-2: #221930;
  --chrome-text: #f4f1f9;
  --chrome-muted: #9d93b0;
  --chrome-border: rgba(255,255,255,.10);

  /* Radii / shadow / motion */
  --radius-sm: 7px;
  --radius: 11px;
  --radius-lg: 16px;
  --shadow-xs: 0 1px 2px rgba(22,16,31,.05);
  --shadow-sm: 0 2px 8px rgba(22,16,31,.07);
  --shadow-md: 0 10px 30px rgba(22,16,31,.13);
  --ease: cubic-bezier(.4,0,.2,1);
}

/* Dark workspace. The figure canvas deliberately stays white so what
   you see on screen is what lands in the exported image. */
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #100c18;
  --surface: #1a1426;
  --surface-2: #201830;
  --surface-3: #2a2040;
  --border: #2f2743;
  --border-strong: #453a5e;
  --text: #efeaf7;
  --muted: #a99dbf;   /* 5.99:1 on the darkest panel */
  --faint: #9a8fb2;   /* was #7d7292 — only reached 3.40:1, below AA */

  --on-accent: #150f20;
  --solid-bg: #2a2040;
  --solid-fg: #efeaf7;

  --label: #b3a8c8;
  --hint: #a99dbf;
  --inset: #201830;
  --accent: #a78bfa;
  --accent-hover: #b9a2ff;
  --accent-soft: #2b2142;
  --accent-soft-border: #453a68;
  --gold-soft: #2e2413;
  --success-soft: #122b22;
  --danger-soft: #2e1618;
  --chrome: #0b0812;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.4);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.45);
  --shadow-md: 0 10px 30px rgba(0,0,0,.55);
}


* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.45;
}
input, select, textarea, button { font-family: inherit; }
input[type="number"], input[type="text"] { font-variant-numeric: tabular-nums; }

/* ═══════════════════════════════════════════════════════════
   Topbar
═══════════════════════════════════════════════════════════ */
.app-topbar {
  position: sticky; top: 0; z-index: 200;
  background: var(--chrome);
  border-bottom: 1px solid var(--chrome-border);
  padding: 0 28px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}
.app-topbar-inner { max-width: 1500px; margin: auto; padding: 0; display: flex; justify-content: space-between; align-items: center; width: 100%; }
.app-logo { font-size: 19px; font-weight: 700; letter-spacing: -0.02em; color: var(--chrome-text); text-decoration: none; }
.app-logo span { color: var(--gold-bright); }
.app-tag { font-size: 10.5px; color: var(--chrome-muted); font-weight: 600; letter-spacing: 0.07em; text-transform: uppercase; }
.app-shell { max-width: 1500px; margin: auto; padding: 20px 28px 40px 28px; }

header.app-header { display: flex; justify-content: center; align-items: baseline; gap: 14px; margin-bottom: 24px; padding-bottom: 18px; }
header.app-header h1 { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; color: var(--text); }
header.app-header span { font-size: 13px; color: var(--muted); }

/* ═══════════════════════════════════════════════════════════
   Mode selector (sits on the dark topbar)
═══════════════════════════════════════════════════════════ */
.mode-selector { display: flex; gap: 0; border: 1px solid var(--chrome-border); border-radius: 8px; overflow: hidden; }
.mode-btn { padding: 8px 18px; font-size: 12.5px; font-weight: 600; border: none; cursor: pointer; background: transparent; color: var(--chrome-muted); transition: background .15s var(--ease), color .15s var(--ease); border-right: 1px solid rgba(255,255,255,.1); white-space: nowrap; }
.mode-btn:last-child { border-right: none; }
.mode-btn.active { background: var(--gold); color: #14100a; }
.mode-btn:hover:not(.active) { background: rgba(255,255,255,.07); color: var(--chrome-text); }

/* ═══════════════════════════════════════════════════════════
   Section cards / titles / fields
═══════════════════════════════════════════════════════════ */
.panel { background: var(--surface); padding: 0 0 22px 0; margin-bottom: 18px; }

.section-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; background: var(--surface); }
.section-card .section-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 12px; }

/* Numbered group headers (① Data Input, ② Preprocessing Pipeline, …) */
.control-panel .section-title:not(.collapsible-header .section-title) {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
  padding: 4px 0 10px;
  margin-top: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }

.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 11px; font-weight: 600; color: var(--muted); letter-spacing: 0.02em; }
.field input, .field select, .field textarea {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 13.5px; padding: 8px 10px;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease); outline: none; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.field input[type="file"] { padding: 6px 10px; cursor: pointer; }
.field input[type="color"] { padding: 3px 5px; height: 34px; cursor: pointer; }
.field textarea { resize: vertical; min-height: 78px; font-size: 12.5px; }

.slider-container { display: flex; align-items: center; gap: 10px; width: 100%; }
.slider-container input[type="range"] { -webkit-appearance: none; width: 100%; background: var(--surface-3); height: 5px; border-radius: 3px; outline: none; }
.slider-container input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%; background: var(--accent); cursor: pointer; box-shadow: var(--shadow-xs); }
.slider-container span { font-size: 11.5px; font-weight: 700; min-width: 32px; text-align: right; color: var(--muted); }

.toggles { display: flex; gap: 18px; margin-top: 10px; flex-wrap: wrap; }
.toggle-item { display: flex; align-items: center; gap: 7px; cursor: pointer; font-size: 12.5px; font-weight: 600; color: var(--text); user-select: none; }
.toggle-item input[type="checkbox"] { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }

/* ═══════════════════════════════════════════════════════════
   Buttons
═══════════════════════════════════════════════════════════ */
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; align-items: center; }
.download-group { display: flex; background: var(--solid-bg); border-radius: var(--radius-sm); overflow: hidden; }
.download-group .btn { border-radius: 0; }
.download-group select { background: var(--solid-bg); color: var(--solid-fg); border: none; font-size: 13px; font-weight: 600; padding: 0 10px; outline: none; cursor: pointer; border-left: 1px solid rgba(255,255,255,.12); }

.btn { font-size: 13px; font-weight: 600; padding: 10px 20px; border: none; border-radius: var(--radius-sm); cursor: pointer; transition: filter .15s var(--ease), transform .08s var(--ease), background .15s var(--ease); letter-spacing: 0.01em; }
.btn:active { transform: scale(0.97); }
.btn:hover { filter: brightness(1.08); }
.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: var(--shadow-xs); }
.btn-primary:hover { filter: none; background: var(--accent-hover); }
.btn-secondary { background: var(--solid-bg); color: var(--solid-fg); }
.btn-outline { background: var(--surface); color: var(--text); border: 1px solid var(--border-strong); }
.btn-outline:hover { filter: none; background: var(--surface-2); }
.btn-accent-blue { background: var(--accent); color: var(--on-accent); border: 1px solid var(--accent); padding: 10px 18px; }
.btn-accent-blue:hover { filter: none; background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-green { background: var(--success); color: #fff; border: 1px solid var(--success); padding: 10px 18px; }
.btn-green:hover { filter: none; background: #047857; border-color: #047857; }
.btn-danger-action { background: var(--danger); color: #ffffff; padding: 5px 10px; font-size: 11.5px; border-radius: 6px; }
.btn-danger-action:hover { filter: none; background: #b91c1c; }
.btn-sm { padding: 7px 14px; font-size: 12px; }

#status, #xyFileStatus { font-size: 13px; color: var(--text); margin-top: 0px; min-height: auto; display: inline-block; vertical-align: middle; }
#status.ok { color: var(--success); }
#status.err { color: var(--danger); }

/* ═══════════════════════════════════════════════════════════
   Spec cards / chips / badges
═══════════════════════════════════════════════════════════ */
#spectrumControls { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 12px; }
.spec-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.spec-card b { font-size: 13px; font-weight: 700; display: block; margin-bottom: 10px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.spec-card .field { margin-bottom: 9px; }
.spec-meta { font-size: 10.5px; color: var(--muted); margin-bottom: 9px; line-height: 1.5; background: var(--surface-2); border-radius: 6px; padding: 7px 9px; word-break: break-word; }
.spec-meta b { display: inline; font-size: 10.5px; color: var(--accent); }

.peak-table-wrap { margin-top: 22px; padding: 18px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.peak-table-wrap h3 { font-size: 14.5px; font-weight: 700; margin-bottom: 10px; }
table.peak-table { width: 100%; border-collapse: collapse; font-size: 12.5px; margin-top: 8px; }
table.peak-table th { background: var(--surface-2); color: var(--muted); padding: 9px 12px; text-align: left; font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 1px solid var(--border); }
table.peak-table td { padding: 7px 12px; border-bottom: 1px solid var(--border); }
table.peak-table tr:hover td { background: var(--surface-2); }
table.peak-table td input { border: 1px solid var(--border); background: var(--surface); width: 100%; font-size: 12.5px; outline: none; padding: 5px 7px; border-radius: 6px; }
table.peak-table td input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.peak-dl-group { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; align-items: center; }

.comp-tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.comp-btn { padding: 7px 16px; border-radius: var(--radius-sm); font-size: 12.5px; font-weight: 600; border: 1px solid var(--border); background: var(--surface); cursor: pointer; color: var(--muted); transition: all .15s var(--ease); }
.comp-btn.active { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }

.xy-tabs { display: flex; gap: 0; margin-bottom: 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; width: fit-content; }
.xy-tab { padding: 7px 18px; font-size: 12.5px; font-weight: 600; cursor: pointer; background: var(--surface); color: var(--muted); border: none; border-right: 1px solid var(--border); }
.xy-tab:last-child { border-right: none; }
.xy-tab.active { background: var(--solid-bg); color: var(--solid-fg); }

.data-type-badge { display: inline-block; background: var(--accent-soft); color: var(--accent); border-radius: 20px; padding: 2px 11px; font-size: 11px; font-weight: 700; margin-left: 10px; vertical-align: middle; }

/* ═══════════════════════════════════════════════════════════
   Collapsibles
═══════════════════════════════════════════════════════════ */
.collapsible-header {
  display: flex; justify-content: space-between; align-items: center; cursor: pointer; user-select: none;
  padding: 9px 4px; border-radius: 8px; transition: background .12s var(--ease);
}
.collapsible-header:hover { background: var(--surface-2); }
.collapsible-header .section-title { font-size: 12.5px; font-weight: 700; color: var(--text); text-transform: none; letter-spacing: 0; }
.collapsible-header .chevron { transition: transform 0.2s var(--ease); font-size: 11px; color: var(--faint); }
.collapsible-header.open .chevron { transform: rotate(180deg); color: var(--accent); }
.collapsible-body { overflow: hidden; transition: max-height 0.3s var(--ease); }
.hidden { display: none !important; }

.file-chip { display: inline-flex; align-items: center; gap: 6px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 20px; padding: 5px 12px; font-size: 12px; font-weight: 600; color: var(--text); max-width: 280px; }
.file-chip span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-chip .chip-remove { cursor: pointer; color: var(--faint); font-size: 14px; flex-shrink: 0; line-height: 1; transition: color 0.15s; background: none; border: none; padding: 0; font-family: inherit; }
.file-chip .chip-remove:hover { color: var(--danger); }
.fmt-tag { display:inline-block; background: var(--success-soft); color: var(--success); border:1px solid #a7f3d0; border-radius:5px; padding:1px 7px; font-size:10px; font-weight:700; margin-left:6px; }
.info-box { font-size: 12px; color: var(--muted); background: var(--surface-2); border-left: 3px solid var(--accent); padding: 8px 12px; border-radius: 4px; margin-bottom: 12px; line-height: 1.5; }
.fit-result { margin-top: 14px; background: var(--surface); border:1px solid var(--border); border-radius: var(--radius); padding:14px; font-size:13px; }
.fit-result table { width:100%; border-collapse:collapse; margin-top:8px; }
.fit-result td { padding:5px 10px; border-bottom:1px solid var(--border); }
.fit-result td:first-child { font-weight:700; color: var(--text); width:45%; }
.group-badge { display:inline-block; border-radius:5px; padding:1px 7px; font-size:10px; font-weight:700; color:#fff; margin-left:6px; }
.app-footer { text-align: center; padding: 28px 20px; color: var(--faint); font-size: 12px; border-top: 1px solid var(--border); margin-top: 28px; }

#fitResultBox { max-height: 250px; overflow-y: auto; padding-right: 5px; }

/* ═══════════════════════════════════════════════════════════
   Sticky actions bar
═══════════════════════════════════════════════════════════ */
.panel-actions {
  position: sticky; bottom: 0; z-index: 50;
  background: var(--surface);
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  box-shadow: 0 -8px 20px rgba(20,22,31,.05);
  display: flex; gap: 8px; flex-wrap: wrap;
}

/* ═══════════════════════════════════════════════════════════
   Workspace layout
═══════════════════════════════════════════════════════════ */
.workspace { display: flex; gap: 0; align-items: stretch; width: 100%; position: relative; min-height: 480px; }
.workspace.layout-left  { flex-direction: row; }
.workspace.layout-right { flex-direction: row-reverse; }
.workspace.layout-top    { flex-direction: column; }
.workspace.layout-bottom { flex-direction: column-reverse; }

.control-panel {
  flex: none; width: 360px; min-width: 240px; max-width: 600px;
  overflow-y: auto; overflow-x: hidden;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: width 0.25s var(--ease), min-width 0.25s var(--ease), opacity 0.2s var(--ease), height 0.25s var(--ease);
  scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent;
  position: relative;
}
.control-panel::-webkit-scrollbar { width: 5px; }
.control-panel::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }

.workspace.layout-top    .control-panel,
.workspace.layout-bottom .control-panel {
  width: 100% !important; max-width: 100% !important; min-width: 0 !important;
  height: 320px; max-height: 520px;
}
.control-panel.panel-collapsed { width: 0 !important; min-width: 0 !important; opacity: 0; pointer-events: none; overflow: hidden; }
.workspace.layout-top    .control-panel.panel-collapsed,
.workspace.layout-bottom .control-panel.panel-collapsed { height: 0 !important; max-height: 0 !important; }

/* ═══════════════════════════════════════════════════════════
   Plot panel / annotation toolbar
═══════════════════════════════════════════════════════════ */
.annot-toolbar {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); flex: none;
}
.annot-toolbar { flex-direction: column; align-items: stretch; }
.annot-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; width: 100%; }
.annot-row select, .annot-row input[type="number"], .annot-row input[type="text"] { font-size: 12px; padding: 4px 6px; border-radius: 6px; border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.annot-sep { width: 1px; height: 20px; background: var(--border); margin: 0 2px; }
.annot-status { font-size: 11px; color: var(--accent, #7c3aed); font-weight: 600; margin-left: auto; }
.annot-more { display: flex; flex-direction: column; gap: 6px; width: 100%; padding-top: 6px; border-top: 1px dashed var(--border); }
.annot-more[hidden] { display: none; }
.annot-hint { font-size: 11px; color: var(--hint); width: 100%; }
.btn.is-armed { background: #2563eb !important; color: #fff !important; border-color: #2563eb !important; }
g.annotation.rx-ann-selected rect.bg { stroke: #2563eb !important; stroke-width: 2px !important; stroke-dasharray: 4 3; }
g.annotation.rx-ann-selected { filter: drop-shadow(0 0 2px #2563eb); }
.annot-toolbar input[type="color"] { width: 28px; height: 26px; padding: 2px; border-radius: 6px; border: 1px solid var(--border); cursor: pointer; }

.plot-panel {
  flex: 1; min-width: 0; min-height: 0;
  display: flex; flex-direction: column; gap: 14px; padding: 16px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: auto;
}
.plot-panel #plot-wrapper,
.plot-panel #xy-plot-wrapper {
  min-width: 260px; min-height: 200px; flex: none; margin: 0 auto;
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border);
  background: #fff; box-shadow: var(--shadow-sm);
}

/* ═══════════════════════════════════════════════════════════
   Resize handles
═══════════════════════════════════════════════════════════ */
.workspace-resizer { flex: none; display: flex; align-items: center; justify-content: center; background: transparent; transition: background 0.15s; z-index: 10; position: relative; }
.workspace-resizer:hover, .workspace-resizer:active { background: var(--accent-soft); }
.resizer-vertical { width: 10px; cursor: ew-resize; min-height: 60px; }
.resizer-vertical::before { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 3px; height: 44px; background: var(--border-strong); border-radius: 3px; transition: background 0.15s, height 0.15s; }
.resizer-vertical:hover::before { background: var(--accent); height: 60px; }
.resizer-horizontal { height: 10px; width: 100%; cursor: ns-resize; min-width: 60px; }
.resizer-horizontal::before { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); height: 3px; width: 44px; background: var(--border-strong); border-radius: 3px; transition: background 0.15s, width 0.15s; }
.resizer-horizontal:hover::before { background: var(--accent); width: 60px; }
.resizer-dots { display: none; }

/* ═══════════════════════════════════════════════════════════
   Layout toolbar
═══════════════════════════════════════════════════════════ */
.layout-toolbar {
  display: flex; align-items: center; gap: 8px; margin: 0 0 16px 0; padding: 8px 12px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); flex-wrap: wrap;
  box-shadow: var(--shadow-xs);
}
.layout-toolbar-label { font-size: 11px; font-weight: 700; color: var(--faint); text-transform: uppercase; letter-spacing: 0.07em; white-space: nowrap; margin-right: 2px; }
.layout-btn-group { display: flex; gap: 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); }
.layout-btn { display: flex; align-items: center; gap: 6px; padding: 6px 13px; font-size: 12px; font-weight: 600; border: none; border-right: 1px solid var(--border); background: var(--surface); color: var(--muted); cursor: pointer; transition: background 0.13s, color 0.13s; white-space: nowrap; }
.layout-btn:last-child { border-right: none; }
.layout-btn:hover:not(.active) { background: var(--accent-soft); color: var(--accent); }
.layout-btn.active { background: var(--accent); color: var(--on-accent); }
.layout-btn svg { flex-shrink: 0; }
.layout-divider { width: 1px; height: 26px; background: var(--border); margin: 0 4px; }
.layout-collapse-btn { display: flex; align-items: center; gap: 6px; padding: 6px 13px; font-size: 12px; font-weight: 600; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--muted); cursor: pointer; transition: all 0.13s; }
.layout-collapse-btn:hover { background: var(--gold-soft); border-color: var(--warning); color: var(--warning); }
.layout-collapse-btn.collapsed { background: var(--accent-soft); border-color: var(--accent-soft-border); color: var(--accent); }
.layout-reset-btn { display: flex; align-items: center; gap: 5px; padding: 6px 11px; font-size: 12px; font-weight: 600; border: 1px solid var(--border); border-radius: 8px; background: transparent; color: var(--faint); cursor: pointer; margin-left: auto; transition: all 0.13s; }
.layout-reset-btn:hover { color: var(--danger); border-color: #fca5a5; background: var(--danger-soft); }
.layout-toolbar::after { content: 'Ctrl+1/2/3/4 \00b7 Ctrl+\\ to collapse'; font-size: 10px; color: var(--faint); margin-left: auto; white-space: nowrap; }
@media (max-width: 700px) { .layout-toolbar::after { display: none; } }

/* ═══════════════════════════════════════════════════════════
   Panel header
═══════════════════════════════════════════════════════════ */
.control-panel-header {
  position: sticky; top: 0; z-index: 5; background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 10px 16px; display: flex; align-items: center; justify-content: space-between;
  font-size: 11px; font-weight: 700; color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em;
}
.control-panel-header .panel-mode-label { display: flex; align-items: center; gap: 6px; }
.control-panel-header .panel-collapse-x {
  width: 22px; height: 22px; display: flex; align-items: center; justify-content: center;
  border: none; background: none; cursor: pointer; color: var(--faint); border-radius: 5px; font-size: 13px; transition: all 0.13s;
}
.control-panel-header .panel-collapse-x:hover { background: var(--danger-soft); color: var(--danger); }

/* ═══════════════════════════════════════════════════════════
   Section cards inside the panel
═══════════════════════════════════════════════════════════ */
.control-panel .section-card { border-left: none; border-right: none; border-radius: 0; border-top: none; border-bottom: 1px solid var(--border); margin-bottom: 0; padding: 16px; }
.control-panel .section-card:last-child { border-bottom: none; }
.control-panel .section-card:first-child { border-top: none; }

/* Quick-nav pills */
.quick-nav {
  display: flex; gap: 6px; flex-wrap: wrap; padding: 10px 16px; border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}
.quick-nav-pill {
  font-size: 11px; font-weight: 700; padding: 5px 11px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--surface); color: var(--muted); cursor: pointer; transition: all .13s var(--ease); white-space: nowrap;
}
.quick-nav-pill:hover { border-color: var(--accent-soft-border); color: var(--accent); background: var(--accent-soft); }

@media (max-width: 900px) {
  .workspace.layout-left, .workspace.layout-right { flex-direction: column !important; }
  .workspace.layout-left .control-panel, .workspace.layout-right .control-panel {
    width: 100% !important; max-width: 100% !important; min-width: 0 !important; height: 300px; max-height: 300px;
  }
  .resizer-vertical { display: none; }
  .layout-toolbar::after { display: none; }
}

body.resizing-h { cursor: ew-resize !important; user-select: none !important; }
body.resizing-v { cursor: ns-resize !important; user-select: none !important; }

.field input[type="color"] { padding: 0; height: 34px; width: 100%; cursor: pointer; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.field input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.field input[type="color"]::-webkit-color-swatch { border: none; }

/* Action bar placement follows dock side */
.layout-left .panel-actions, .layout-right .panel-actions { order: -1; border-top: none; border-bottom: 1px solid var(--border); box-shadow: 0 4px 10px rgba(20,22,31,.05); z-index: 10; }
.layout-top .panel-actions, .layout-bottom .panel-actions { order: 10; border-bottom: none; border-top: 1px solid var(--border); box-shadow: 0 -4px 10px rgba(20,22,31,.05); }

.fixed-logo { position: fixed; bottom: 20px; right: 20px; width: 120px; height: auto; z-index: 9999; opacity: 0.55; pointer-events: none; transition: opacity 0.3s; }
.fixed-logo:hover { opacity: 1; }

@keyframes rnspxFlash {
  0% { background: var(--accent-soft); }
  100% { background: transparent; }
}
.rnspx-flash { animation: rnspxFlash 0.9s var(--ease); border-radius: var(--radius); }

/* ═══════════════════════════════════════════════════════════
   Topbar utility cluster — home link, theme, shortcuts
═══════════════════════════════════════════════════════════ */
.app-topbar-inner { gap: 18px; }
.topbar-brand { display: flex; align-items: baseline; gap: 12px; min-width: 0; }
.topbar-utils { display: flex; align-items: center; gap: 6px; }

.chrome-link {
  display: inline-flex; align-items: center; gap: 7px;
  height: 32px; padding: 0 12px;
  border: 1px solid var(--chrome-border); border-radius: 8px;
  background: rgba(255,255,255,.04);
  color: var(--chrome-muted); font-size: 12.5px; font-weight: 600;
  text-decoration: none; white-space: nowrap;
  transition: background .15s var(--ease), color .15s var(--ease), border-color .15s var(--ease);
}
.chrome-link:hover { background: rgba(255,255,255,.10); color: var(--chrome-text); border-color: rgba(255,255,255,.22); }
.chrome-link.is-home { color: #f0e2bd; border-color: rgba(224,168,46,.35); background: rgba(224,168,46,.10); }
.chrome-link.is-home:hover { background: rgba(224,168,46,.20); color: #fff4dc; border-color: rgba(224,168,46,.6); }
.chrome-link svg { flex-shrink: 0; }

.chrome-icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; padding: 0;
  border: 1px solid var(--chrome-border); border-radius: 8px;
  background: rgba(255,255,255,.04); color: var(--chrome-muted);
  cursor: pointer; transition: background .15s var(--ease), color .15s var(--ease);
}
.chrome-icon-btn:hover { background: rgba(255,255,255,.10); color: var(--chrome-text); }
.chrome-icon-btn:focus-visible, .chrome-link:focus-visible { outline: 2px solid var(--gold-bright); outline-offset: 2px; }

/* Icon swap driven by the active theme */
[data-theme="dark"] .icon-when-light { display: none; }
:root:not([data-theme="dark"]) .icon-when-dark { display: none; }

@media (max-width: 1100px) {
  .app-tag { display: none; }
  .chrome-link .chrome-link-text { display: none; }
  .chrome-link { padding: 0 9px; }
}
@media (max-width: 820px) {
  .app-topbar { height: auto; padding: 8px 14px; }
  .app-topbar-inner { flex-wrap: wrap; gap: 10px; }
  .mode-btn { padding: 7px 11px; font-size: 11.5px; }
}

/* ═══════════════════════════════════════════════════════════
   Drop zone — drag spectra anywhere onto the workspace
═══════════════════════════════════════════════════════════ */
.drop-veil {
  position: fixed; inset: 0; z-index: 900;
  display: none; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--chrome) 72%, transparent);
  backdrop-filter: blur(3px);
}
.drop-veil.is-active { display: flex; }
.drop-veil-card {
  border: 2px dashed var(--gold-bright); border-radius: var(--radius-lg);
  padding: 38px 54px; text-align: center; color: #fff;
  background: rgba(0,0,0,.25);
}
.drop-veil-card strong { display: block; font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.drop-veil-card span { font-size: 13px; color: #d8cfe6; font-family: 'IBM Plex Mono', monospace; }

/* ═══════════════════════════════════════════════════════════
   Modal — keyboard reference
═══════════════════════════════════════════════════════════ */
.rx-modal {
  position: fixed; inset: 0; z-index: 950;
  display: none; align-items: center; justify-content: center;
  background: rgba(11,8,18,.55); padding: 20px;
}
.rx-modal.is-open { display: flex; }
.rx-modal-card {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  width: min(560px, 100%); max-height: 84vh; overflow: auto;
}
.rx-modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.rx-modal-head h2 { font-size: 15px; font-weight: 700; letter-spacing: -0.01em; }
.rx-modal-close {
  border: 1px solid var(--border); background: var(--surface-2); color: var(--muted);
  width: 28px; height: 28px; border-radius: 7px; cursor: pointer; font-size: 14px;
}
.rx-modal-close:hover { background: var(--danger-soft); color: var(--danger); }
.rx-modal-body { padding: 8px 20px 20px; }
.rx-kbd-group { margin-top: 14px; }
.rx-kbd-group h3 {
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .09em;
  color: var(--muted); margin-bottom: 8px;
}
.rx-kbd-row {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 7px 0; border-bottom: 1px dashed var(--border); font-size: 13px;
}
.rx-kbd-row:last-child { border-bottom: none; }
kbd {
  font-family: 'IBM Plex Mono', monospace; font-size: 11px; font-weight: 600;
  background: var(--surface-3); border: 1px solid var(--border-strong);
  border-bottom-width: 2px; border-radius: 5px; padding: 2px 7px; color: var(--text);
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════
   Toast — quiet confirmations
═══════════════════════════════════════════════════════════ */
.rx-toast {
  position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 14px);
  z-index: 980; opacity: 0; pointer-events: none;
  background: var(--chrome); color: #fff;
  border: 1px solid var(--chrome-border); border-radius: 10px;
  padding: 10px 16px; font-size: 12.5px; font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.rx-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ═══════════════════════════════════════════════════════════
   Skip link + footer
═══════════════════════════════════════════════════════════ */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 1000;
  background: var(--gold-bright); color: #14100a;
  padding: 10px 16px; font-weight: 700; font-size: 13px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.app-footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
.app-footer a:hover { text-decoration: underline; }

/* The product name is the page's h1; the topbar styling already sets its size. */
h1.app-logo { font-size: 19px; line-height: 1; margin: 0; }

/* header buttons that are <button> rather than <a> */
button.chrome-link { cursor: pointer; font-family: inherit; }

/* Advanced folds inside a settings section */
details.adv-fold { margin-top: 10px; border: 1px dashed var(--border); border-radius: 8px; padding: 0 10px; }
details.adv-fold > summary { cursor: pointer; list-style: none; padding: 7px 0; font-size: 11.5px; font-weight: 700; color: var(--muted); user-select: none; }
details.adv-fold > summary::-webkit-details-marker { display: none; }
details.adv-fold > summary::before { content: "▸"; display: inline-block; width: 14px; transition: transform .15s; }
details.adv-fold[open] > summary::before { transform: rotate(90deg); }
details.adv-fold[open] { padding-bottom: 10px; }
details.adv-fold > summary:hover { color: var(--accent); }

/* Drop-down menus (Export, File) */
details.rx-menu { position: relative; }
details.rx-menu > summary { list-style: none; cursor: pointer; user-select: none; }
details.rx-menu > summary::-webkit-details-marker { display: none; }
.rx-menu-pop {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 900; min-width: 220px;
  display: flex; flex-direction: column; gap: 6px; padding: 8px;
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,.18);
}
.rx-menu-pop .btn, .rx-menu-pop .download-group { width: 100%; }
.rx-menu-pop .download-group .btn { flex: 1; }
.rx-menu-item {
  text-align: left; background: none; border: none; border-radius: 7px; padding: 8px 10px;
  font: inherit; font-size: 13px; color: var(--text); cursor: pointer; white-space: nowrap;
}
.rx-menu-item:hover, .rx-menu-item:focus-visible { background: var(--accent-soft); color: var(--accent); }

/* Result tabs under the plot */
.rx-result-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: -6px; }
.rx-tab {
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  border-radius: 8px; padding: 6px 12px; font: inherit; font-size: 12.5px; font-weight: 600; cursor: pointer;
}
.rx-tab:hover { color: var(--accent); border-color: var(--accent-soft-border); }
.rx-tab.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }
.rx-tab-hidden { display: none !important; }
/* when the action bar sits at the bottom of the panel, menus open upwards */
.layout-top .panel-actions .rx-menu-pop, .layout-bottom .panel-actions .rx-menu-pop { top: auto; bottom: calc(100% + 6px); }

/* Step guide: ✓ on quick-nav steps already used, a pulse on the next one */
.quick-nav-pill.is-done { border-color: rgba(22,163,74,.45); color: #15803d; background: rgba(22,163,74,.08); }
.quick-nav-pill.is-done::after { content: " ✓"; font-weight: 800; }
:root[data-theme="dark"] .quick-nav-pill.is-done { color: #4ade80; border-color: rgba(74,222,128,.4); background: rgba(74,222,128,.08); }
.quick-nav-pill.is-next, .btn.is-next { animation: rx-next-pulse 1.8s ease-in-out infinite; }
@keyframes rx-next-pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(124,58,237,0); } 50% { box-shadow: 0 0 0 4px rgba(124,58,237,.35); } }
@media (prefers-reduced-motion: reduce) { .quick-nav-pill.is-next, .btn.is-next { animation: none; outline: 2px solid var(--accent); outline-offset: 2px; } }

/* Undo / Redo in the layout bar */
.rx-hist-btn { display: flex; align-items: center; gap: 5px; padding: 6px 11px; font-size: 12px; font-weight: 600; border: 1px solid var(--border); border-radius: 8px; background: transparent; color: var(--muted); cursor: pointer; transition: all 0.13s; }
.rx-hist-btn:hover:not(:disabled) { color: var(--accent); border-color: var(--accent-soft-border); background: var(--accent-soft); }
.rx-hist-btn:disabled { opacity: .45; cursor: default; }
#rxUndoBtn { margin-left: auto; }
#rxRedoBtn { margin-left: 6px; }
#rxRedoBtn + .layout-reset-btn { margin-left: 6px; }

/* ⓘ links from section titles to the methods guide */
.rx-guide-link { margin-left: 6px; font-size: 13px; font-weight: 700; text-decoration: none; color: var(--hint); border-radius: 50%; padding: 0 3px; }
.rx-guide-link:hover, .rx-guide-link:focus-visible { color: var(--accent); background: var(--accent-soft); }
.live-count .live-dot { vertical-align: 0; animation: rnsxlive 2s ease-in-out infinite; }
@keyframes rnsxlive { 50% { opacity: .35; } }
@media (prefers-reduced-motion: reduce) { .live-count .live-dot { animation: none; } }