/* ============================================================
   TR Config Generator — Design Tokens
   ============================================================ */

:root {
  /* accents */
  --accent: #7c5cff;
  --accent-hover: #6a48f5;
  --accent-soft: rgba(124, 92, 255, 0.10);
  --accent-soft-strong: rgba(124, 92, 255, 0.18);
  --accent-border: rgba(124, 92, 255, 0.35);
  --accent-fg: #ffffff;

  /* status */
  --ok: #22c55e;
  --ok-soft: rgba(34, 197, 94, 0.14);
  --warn: #eab308;
  --warn-soft: rgba(234, 179, 8, 0.14);
  --err: #ef4444;
  --err-soft: rgba(239, 68, 68, 0.14);

  /* fonts */
  --font-sans: "Inter", "Inter Placeholder", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* radii */
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 18px;
}

/* ---------- Light theme ---------- */
[data-theme="light"] {
  --bg: #f5f5f7;
  --bg-elev: #ffffff;
  --bg-elev-2: #ffffff;
  --bg-inset: #fafafb;
  --bg-hover: #f4f4f6;
  --bg-rail: #ffffff;
  --bg-nav: #ffffff;

  --fg: #18181b;
  --fg-muted: #6b6b73;
  --fg-faint: #a0a0a8;
  --fg-on-accent: #ffffff;

  --border: #e7e7eb;
  --border-strong: #d4d4d8;
  --border-faint: #efeff2;

  --shadow-sm: 0 1px 2px rgba(20, 20, 30, 0.04);
  --shadow-md: 0 4px 12px rgba(20, 20, 30, 0.06);
  --shadow-lg: 0 12px 32px rgba(20, 20, 30, 0.08);

  --code-bg: #fafafa;
}

/* ---------- Dark theme ---------- */
[data-theme="dark"] {
  --bg: #0c0c10;
  --bg-elev: #16161d;
  --bg-elev-2: #1c1c25;
  --bg-inset: #111118;
  --bg-hover: #20202a;
  --bg-rail: #131319;
  --bg-nav: #131319;

  --fg: #f1f1f3;
  --fg-muted: #9c9caa;
  --fg-faint: #5e5e6b;
  --fg-on-accent: #ffffff;

  --border: #26262f;
  --border-strong: #34343f;
  --border-faint: #1d1d25;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);

  --code-bg: #0f0f15;
}

/* ============================================================
   Base
   ============================================================ */

* { box-sizing: border-box; }
html, body, #app { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.45;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }
/* Links inherit color and aren't underlined by default — components opt into
   emphasis (color / hover underline) intentionally, so nothing reads as a raw
   browser hyperlink. */
a { color: inherit; text-decoration: none; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 8px;
  border: 2px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--fg-faint); }

/* ============================================================
   Shell layout
   ============================================================ */

.shell {
  display: grid;
  grid-template-columns: 56px 240px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* --- Left rail --- */
.rail {
  background: var(--bg-rail);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 0;
  gap: 4px;
  position: relative;
  z-index: 70;
}
.rail-brand {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  display: grid; place-items: center;
  margin-bottom: 12px;
  box-shadow: 0 4px 14px var(--accent-soft-strong);
  overflow: hidden;
  transition: transform 120ms;
}
.rail-brand:hover { transform: translateY(-1px); }
.rail-brand img { width: 36px; height: 36px; display: block; }

/* ── App footer ── */
.app-footer {
  border-top: 1px solid var(--border-faint);
  background: var(--bg-elev);
  padding: 14px 24px;
  flex-shrink: 0;
}
.app-footer-inner {
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--fg-muted);
}
.app-footer-brand { display: inline-flex; align-items: center; gap: 8px; color: var(--fg-muted); }
.app-footer-brand:hover { color: var(--fg); }
.app-footer-brand img { border-radius: 5px; display: block; }
.app-footer-brand strong { color: var(--fg); font-weight: 600; }
.app-footer-priv { display: inline-flex; align-items: center; gap: 6px; color: var(--fg-faint); }
.app-footer-priv svg { color: var(--ok); }
.app-footer-links { display: inline-flex; align-items: center; gap: 16px; margin-left: auto; }
.app-footer-ver { color: var(--fg-faint); }
.app-footer-links a { color: var(--fg-muted); }
.app-footer-links a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.rail-btn {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: transparent;
  border: 0;
  color: var(--fg-muted);
  display: grid; place-items: center;
  transition: background 120ms, color 120ms;
}
.rail-btn:hover { background: var(--bg-hover); color: var(--fg); }
.rail-btn.active { background: var(--accent-soft); color: var(--accent); }
a.rail-btn { text-decoration: none; }
.rail-divider {
  width: 22px;
  height: 1px;
  background: var(--border);
  margin: 6px 0;
  flex-shrink: 0;
}
.rail-spacer { flex: 1; }

/* --- Step nav --- */
.stepnav {
  background: var(--bg-nav);
  border-right: 1px solid var(--border);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.stepnav-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 2px 2px 20px;
  padding: 6px;
  border-radius: var(--r-md);
  color: var(--fg);
  transition: background 120ms;
}
.stepnav-brand:hover { background: var(--bg-hover); }
.stepnav-brand img {
  width: 28px; height: 28px;
  border-radius: 8px; display: block; flex-shrink: 0;
  box-shadow: 0 2px 10px var(--accent-soft-strong);
}
.stepnav-brand-text { display: flex; flex-direction: column; gap: 1px; line-height: 1.12; min-width: 0; }
.stepnav-eyebrow {
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  font-weight: 700;
  white-space: nowrap;
}
.stepnav-product {
  font-size: 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--fg);
  white-space: nowrap;
}
.step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  background: transparent;
  border: 0;
  width: 100%;
  text-align: left;
  color: var(--fg-muted);
  cursor: pointer;
  font-size: 13.5px;
  transition: background 120ms, color 120ms;
}
.step-item:hover { background: var(--bg-hover); color: var(--fg); }
.step-item.current { background: var(--accent-soft); color: var(--fg); font-weight: 500; }
.step-item.locked { cursor: not-allowed; opacity: 0.55; }
.step-item.locked:hover { background: transparent; color: var(--fg-muted); }
.step-circle {
  width: 22px; height: 22px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}
.step-circle.upcoming {
  border: 1.5px solid var(--border-strong);
  color: var(--fg-faint);
  background: transparent;
}
.step-circle.current {
  background: var(--accent);
  color: var(--fg-on-accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.step-circle.done {
  background: var(--ok);
  color: white;
}
.step-substep {
  font-size: 12.5px;
  padding: 6px 10px 6px 42px;
  color: var(--fg-faint);
  border-radius: var(--r-xs);
  cursor: pointer;
  border: 0;
  background: transparent;
  width: 100%;
  text-align: left;
  display: flex;
  gap: 8px;
  align-items: center;
}
.step-substep:hover { color: var(--fg); }
.step-substep.current { color: var(--accent); font-weight: 500; }
.step-substep::before {
  content: "";
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--fg-faint);
  display: inline-block;
}
.step-substep.current::before { background: var(--accent); }
.step-substep.done::before { background: var(--ok); }

/* --- Top bar --- */
.topbar {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  flex-shrink: 0;
  white-space: nowrap;
}
.topbar .btn { white-space: nowrap; }
.crumbs { white-space: nowrap; }
.crumb-brand { white-space: nowrap; }
.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--fg-muted);
}
.crumb-brand { color: var(--accent); font-weight: 600; }
.crumb-sep { color: var(--fg-faint); }
.crumb-current { color: var(--fg); font-weight: 500; }
.crumb-tail { color: var(--fg-faint); font-size: 12px; margin-left: 4px; }

.topbar-actions { display: flex; align-items: center; gap: 10px; }

/* --- Main content --- */
.main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}
.canvas {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px 80px;
}
.canvas-inner {
  max-width: 920px;
  margin: 0 auto;
}
.canvas-wide .canvas-inner { max-width: 1200px; }

/* Responsive 2-col layouts inside main */
@media (max-width: 1180px) {
  .systems-grid {
    grid-template-columns: 1fr !important;
  }
}
@media (max-width: 1024px) {
  .topbar { padding: 0 16px; }
  .topbar-actions .btn:not(.primary) { padding: 6px 10px; font-size: 12.5px; }
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg);
  font-size: 13.5px;
  font-weight: 500;
  transition: background 120ms, border-color 120ms, color 120ms, transform 60ms;
}
.btn:hover { background: var(--bg-hover); }
.btn:active { transform: translateY(0.5px); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--fg-muted); }
.btn.ghost:hover { background: var(--bg-hover); color: var(--fg); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--fg-on-accent);
}
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.primary:disabled, .btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn.danger { color: var(--err); border-color: var(--border); }
.btn.danger:hover { background: var(--err-soft); border-color: var(--err); }
.btn.sm { padding: 5px 10px; font-size: 12.5px; }
.btn.lg { padding: 12px 20px; font-size: 14.5px; }
.btn.icon-only { padding: 7px; }

/* ============================================================
   Cards / sections
   ============================================================ */

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}

.section { margin-bottom: 36px; }
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.section-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 4px;
  color: var(--fg);
}
.section-sub {
  font-size: 13.5px;
  color: var(--fg-muted);
  margin: 0;
  max-width: 580px;
}
.h1 {
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0 0 6px;
}
.h2 {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 4px;
  letter-spacing: -0.005em;
}
.h3 {
  font-size: 14px;
  font-weight: 600;
  margin: 0;
  color: var(--fg);
}
.muted { color: var(--fg-muted); }
.faint { color: var(--fg-faint); }
.mono { font-family: var(--font-mono); font-size: 12.5px; }

.field-group {
  padding: 22px 24px;
  border-bottom: 1px solid var(--border-faint);
}
.field-group:last-child { border-bottom: 0; }
.field-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

/* ============================================================
   Radio cards
   ============================================================ */

.rc-grid {
  display: grid;
  gap: 10px;
}
.rc-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.rc-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.rc-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.rc-grid.cols-6 { grid-template-columns: repeat(6, 1fr); }

.rcard {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  padding: 14px 14px 14px 36px;
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms, background 120ms, box-shadow 120ms;
  min-height: 56px;
}
.rcard:hover { border-color: var(--border-strong); }
.rcard.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 2px var(--accent) inset;
}
.rcard.compact { padding: 12px 12px 12px 34px; min-height: 0; }

.rcard-dot {
  position: absolute;
  left: 12px;
  top: 16px;
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: var(--bg-elev);
  transition: border-color 120ms, background 120ms;
}
.rcard.selected .rcard-dot {
  border-color: var(--accent);
  background:
    radial-gradient(circle at center, var(--accent) 0 4px, var(--bg-elev) 5px 100%);
}
.rcard-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
}
.rcard.selected .rcard-title { color: var(--fg); }
.rcard-desc {
  font-size: 12.5px;
  color: var(--fg-muted);
  margin-top: 4px;
  line-height: 1.4;
}
.rcard-icon { color: var(--fg-muted); flex-shrink: 0; }
.rcard.selected .rcard-icon { color: var(--accent); }

/* Centered radio card variant (icon on top) */
.rcard-center {
  padding: 22px 16px 18px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  min-height: 140px;
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  cursor: pointer;
  transition: border-color 120ms, background 120ms;
}
.rcard-center:hover { border-color: var(--border-strong); }
.rcard-center.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 2px var(--accent) inset;
}
.rcard-center .rcard-dot { display: none; }
/* Checkmark badge in the top-right when a centered card is selected */
.rcard-center::after {
  content: "";
  position: absolute;
  top: 10px; right: 10px;
  width: 18px; height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background: var(--bg-elev);
  transition: all 120ms;
}
.rcard-center.selected::after {
  border-color: var(--accent);
  background: var(--accent)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E")
    center / 11px no-repeat;
}
.rcard-center-icon {
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  background: var(--bg-inset);
  display: grid; place-items: center;
  color: var(--fg-muted);
}
.rcard-center.selected .rcard-center-icon {
  background: var(--bg-elev);
  color: var(--accent);
}
.rcard-center .rcard-title { font-size: 15px; }
.rcard-center .rcard-desc { font-size: 12.5px; }

/* Chip-style radio (preset pills) */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  font-size: 12.5px;
  color: var(--fg-muted);
  cursor: pointer;
  transition: all 120ms;
}
.chip:hover { color: var(--fg); border-color: var(--border-strong); }
.chip.selected {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 500;
}

/* ============================================================
   Toggle row
   ============================================================ */

.trow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-faint);
}
.trow:last-child { border-bottom: 0; }
.trow-info { flex: 1; }
.trow-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  font-family: var(--font-mono);
}
.trow-label.plain { font-family: var(--font-sans); }
.trow-desc {
  font-size: 12.5px;
  color: var(--fg-muted);
  margin-top: 3px;
  line-height: 1.45;
}

.toggle {
  flex-shrink: 0;
  width: 38px;
  height: 22px;
  border-radius: 999px;
  background: var(--border-strong);
  border: 0;
  padding: 0;
  position: relative;
  cursor: pointer;
  transition: background 160ms;
}
.toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  transition: transform 160ms;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.toggle.on { background: var(--accent); }
.toggle.on::after { transform: translateX(16px); }

/* ============================================================
   Form controls
   ============================================================ */

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.field-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}
.field-row > .field { flex: 1; margin-bottom: 0; min-width: 160px; }
.label {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--fg);
  font-family: var(--font-mono);
}
.label.plain { font-family: var(--font-sans); }
.helper {
  font-size: 12px;
  color: var(--fg-muted);
}

/* ── Hover info tooltip ───────────────────────────────────── */
.info-tip {
  display: inline-flex;
  align-items: center;
  margin-left: 6px;
  color: var(--fg-faint);
  cursor: help;
  vertical-align: middle;
  outline: none;
}
.info-tip:hover, .info-tip:focus-visible { color: var(--accent); }
/* Rendered through a portal on <body>, so no ancestor overflow can clip it. */
.info-tip-pop {
  position: fixed;
  z-index: 1000;
  width: max-content;
  max-width: 280px;
  white-space: normal;
  line-height: 1.45;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  padding: 8px 10px;
  border-radius: 6px;
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  transform: translateX(-50%) translateY(-100%);
}
.info-tip-pop.below { transform: translateX(-50%) translateY(0); }

.input, .textarea, .select {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px 12px;
  color: var(--fg);
  font-size: 13.5px;
  transition: border-color 120ms, box-shadow 120ms;
}
.input.mono, .textarea.mono { font-family: var(--font-mono); font-size: 12.5px; }
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input-with-suffix {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--bg-elev);
}
.input-with-suffix:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.input-with-suffix .input {
  border: 0;
  background: transparent;
}
.input-with-suffix .input:focus { box-shadow: none; }
.input-suffix {
  background: var(--bg-inset);
  border: 0;
  border-left: 1px solid var(--border);
  padding: 0 10px;
  font-size: 12.5px;
  color: var(--fg-muted);
  display: grid;
  place-items: center;
  cursor: pointer;
  font-family: var(--font-mono);
}

/* Slider */
.slider-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
}
.slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 999px;
  outline: none;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 4px var(--accent-soft);
  border: 2px solid var(--bg-elev);
}
.slider::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-elev);
}
.slider-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg);
  min-width: 56px;
  text-align: right;
}

/* Tabs */
.tabs {
  display: inline-flex;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 3px;
  gap: 2px;
}
.tab {
  padding: 5px 12px;
  border-radius: 6px;
  border: 0;
  background: transparent;
  color: var(--fg-muted);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
}
.tab:hover { color: var(--fg); }
.tab.active {
  background: var(--bg-elev);
  color: var(--fg);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   CSV Drop Zone
   ============================================================ */

.dropzone {
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--r-md);
  padding: 26px 24px;
  text-align: center;
  background: var(--bg-inset);
  transition: all 160ms;
  cursor: pointer;
}
.dropzone:hover, .dropzone.over {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone-icon {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: var(--bg-elev);
  display: inline-grid; place-items: center;
  color: var(--fg-muted);
  margin-bottom: 8px;
}
.dropzone:hover .dropzone-icon, .dropzone.over .dropzone-icon { color: var(--accent); }
.dropzone-title { font-size: 13.5px; font-weight: 500; color: var(--fg); margin-bottom: 2px; }
.dropzone-sub { font-size: 12px; color: var(--fg-muted); }

.dropzone-loaded {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-inset);
}
.dropzone-file-icon {
  width: 32px; height: 32px;
  border-radius: var(--r-xs);
  background: var(--accent-soft);
  color: var(--accent);
  display: grid; place-items: center;
}
.dropzone-file-info { flex: 1; }
.dropzone-file-name { font-size: 13px; font-weight: 500; color: var(--fg); }
.dropzone-file-meta { font-size: 12px; color: var(--fg-muted); margin-top: 2px; font-family: var(--font-mono); }

.col-detection {
  display: flex; flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.col-pill {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.col-pill.ok { background: var(--ok-soft); color: var(--ok); }
.col-pill.warn { background: var(--warn-soft); color: var(--warn); }

/* ============================================================
   Validation badge
   ============================================================ */

.vbadge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
}
.vbadge.ok { background: var(--ok-soft); color: var(--ok); }
.vbadge.warn { background: var(--warn-soft); color: #ca8a04; }
.vbadge.err { background: var(--err-soft); color: var(--err); }
.vbadge.neutral { background: var(--bg-inset); color: var(--fg-muted); }

/* ============================================================
   Spectrum coverage
   ============================================================ */

.spectrum-card {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  padding: 18px;
}
.spectrum-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.spec-head-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Status pill */
.spec-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
}
.spec-pill.ok  { color: var(--ok);  background: var(--ok-soft);  border-color: transparent; }
.spec-pill.err { color: var(--err); background: var(--err-soft); border-color: transparent; }
.spec-pill.muted { color: var(--fg-muted); background: var(--bg-inset); }

/* View toggle */
.spec-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-inset);
}
.spec-toggle button {
  border: none;
  background: transparent;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-muted);
  cursor: pointer;
}
.spec-toggle button + button { border-left: 1px solid var(--border); }
.spec-toggle button.active { background: var(--accent); color: #fff; }

/* Shared ticks */
.spec-tick {
  position: absolute;
  top: 0; bottom: 0;
  width: 1.5px;
  background: var(--fg);
  z-index: 2;
}
.spec-tick.control { background: var(--accent); }
.spec-tick-dot {
  position: absolute;
  top: -3px; left: -3px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: inherit;
  box-shadow: 0 0 0 2px var(--bg);
}
.spec-axis {
  display: flex;
  justify-content: space-between;
  padding: 6px 2px 0;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--fg-faint);
}

/* ── Per-source bands view ── */
.spec-bands { display: flex; flex-direction: column; gap: 18px; }
.spec-band-row.disabled { opacity: 0.5; }
.spec-band-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.spec-band-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
}
.spec-track-wrap { position: relative; margin-top: 24px; }
.spec-track {
  position: relative;
  height: 34px;
  border-radius: 7px;
  overflow: hidden;
  border: 1px solid var(--border);
  background:
    linear-gradient(90deg,
      var(--err-soft) 0%, var(--warn-soft) 12%,
      rgba(34,197,94,0.10) 40%, rgba(34,197,94,0.10) 60%,
      var(--warn-soft) 88%, var(--err-soft) 100%);
}
.spec-track-guard {
  position: absolute;
  top: 0; bottom: 0;
  background: repeating-linear-gradient(45deg,
    rgba(239,68,68,0.16) 0 5px, rgba(239,68,68,0.04) 5px 10px);
}
.spec-track-usable {
  position: absolute;
  top: 0; bottom: 0;
  border-left: 1px dashed var(--ok);
  border-right: 1px dashed var(--ok);
  background: rgba(34,197,94,0.06);
}
.spec-band-edges {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--fg-faint);
}

/* ── Single axis view ── */
.spec-canvas {
  position: relative;
  height: 110px;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(to right, var(--border-faint) 1px, transparent 1px) 0 0 / 10% 100%,
    var(--bg-inset);
  border-radius: var(--r-xs) var(--r-xs) 0 0;
  /* overflow visible so tick dots at the top aren't sliced; the background is
     still clipped to the rounded corners, and bands are inset so they can't
     poke out. */
}
.spec-canvas-band {
  position: absolute;
  top: 8%; bottom: 8%;
  background: var(--accent-soft);
  border-left: 1.5px solid var(--accent);
  border-right: 1.5px solid var(--accent);
  border-radius: 3px;
}
.spec-canvas-band.disabled { opacity: 0.4; }
.spec-canvas-band-label {
  position: absolute;
  top: 4px; left: 6px;
  font-size: 10.5px;
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 500;
}
.spec-overflow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: #fff;
  background: var(--err);
  z-index: 4;
}
.spec-overflow.left  { left: 6px; }
.spec-overflow.right { right: 6px; }

.spec-empty {
  padding: 28px;
  text-align: center;
  font-size: 13px;
  color: var(--fg-faint);
  border: 1px dashed var(--border);
  border-radius: var(--r-sm);
}

/* Legend */
.spectrum-legend {
  display: flex;
  gap: 14px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.spectrum-legend-item {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--fg-muted);
}
.spectrum-legend-swatch {
  width: 10px; height: 10px;
  border-radius: 2px;
}

/* Uncovered callout */
.spec-uncovered {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--err);
  background: var(--err-soft);
  border-radius: var(--r-sm);
}
.spec-uncovered-head {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--err);
  margin-bottom: 8px;
}
.spec-uncovered-freqs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.spec-chip {
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 11.5px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--fg-muted);
}
.spec-chip.control { color: var(--accent); border-color: var(--accent); }
.spec-chip.more { color: var(--fg-faint); }
.spec-uncovered-note {
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--fg-muted);
}

/* ============================================================
   Center Frequency Calculator
   ============================================================ */
/* Source ↔ System assignment */
.assign-row { margin: 12px 0 4px; }
.assign-row .label { margin-bottom: 6px; }

.center-calc-wrap { margin-top: 14px; }

.center-calc-toggle {
  font-size: 12px;
  gap: 6px;
}

.autocenter-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--fg-muted);
  cursor: pointer;
  user-select: none;
}
.autocenter-check input {
  width: 14px; height: 14px;
  accent-color: var(--accent);
  cursor: pointer;
}

.center-calc {
  margin-top: 12px;
  padding: 18px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}
.center-calc-intro {
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg-muted);
  margin: 0 0 14px;
}
.center-calc-inputs {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.center-calc-paste { flex: 1; min-width: 240px; }
.center-calc-paste .textarea {
  font-size: 12px;
  resize: vertical;
  width: 100%;
}
.center-calc-knobs {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.center-calc-knobs .input { width: 110px; }
.center-calc-knobs .helper { margin-top: 4px; font-size: 11px; }
.center-calc .label { margin-bottom: 5px; }

.center-calc-summary {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 16px 0 12px;
  font-size: 12.5px;
  color: var(--fg-muted);
}
.center-calc-summary strong { color: var(--fg); }

.center-calc-foot {
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--fg-faint);
  margin: 10px 0 0;
}

/* ── Per-dongle result card ── */
.dongle-card {
  margin-bottom: 12px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.dongle-card:last-of-type { margin-bottom: 0; }
.dongle-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.dongle-card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
}
.dongle-card-badge {
  display: grid;
  place-items: center;
  width: 20px; height: 20px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
}

/* Multicolor coverage band */
.dongle-band-wrap {
  position: relative;
  margin-top: 22px;
}
.dongle-band {
  position: relative;
  height: 34px;
  border-radius: 7px;
  overflow: hidden;
  background:
    linear-gradient(90deg,
      var(--err-soft) 0%,
      var(--warn-soft) 14%,
      rgba(34,197,94,0.10) 42%,
      rgba(34,197,94,0.10) 58%,
      var(--warn-soft) 86%,
      var(--err-soft) 100%);
  border: 1px solid var(--border);
}
.dongle-band-guard {
  position: absolute;
  top: 0; bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    rgba(239,68,68,0.16) 0 5px,
    rgba(239,68,68,0.04) 5px 10px);
}
.dongle-band-usable {
  position: absolute;
  top: 0; bottom: 0;
  border-left: 1px dashed var(--ok);
  border-right: 1px dashed var(--ok);
  background: rgba(34,197,94,0.06);
}
.dongle-band-tick {
  position: absolute;
  top: 50%;
  width: 6px; height: 6px;
  margin: -3px 0 0 -3px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--bg);
  z-index: 2;
}
.dongle-band-center {
  position: absolute;
  top: -9px; bottom: -9px;          /* extends above & below the band to stand out */
  width: 4px;
  margin-left: -2px;
  border-radius: 3px;
  background: linear-gradient(180deg, #fde047 0%, #f59e0b 52%, #ea580c 100%);
  box-shadow: 0 0 9px rgba(245, 158, 11, 0.9), 0 0 2px rgba(0, 0, 0, 0.35);
  z-index: 5;
}
.dongle-band-center-flag {
  position: absolute;
  top: -19px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 20px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(180deg, #fde047, #f59e0b);
  color: #7c2d12;
  font-size: 12px;
  line-height: 1;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
}

.dongle-band-edges {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 8px;
  font-size: 11.5px;
}
.dongle-edge { color: var(--fg-faint); white-space: nowrap; }
.dongle-center-val {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}
.dongle-center-val.adj { color: var(--warn); }

.dongle-note {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--warn);
}
.dongle-note svg { flex-shrink: 0; }

.dongle-apply {
  margin-top: 12px;
  gap: 6px;
}

/* ============================================================
   Tables
   ============================================================ */

.tbl-wrap {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--bg-elev);
}
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.tbl thead {
  background: var(--bg-inset);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1;
}
.tbl th {
  text-align: left;
  font-weight: 500;
  padding: 9px 12px;
  color: var(--fg-muted);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.tbl td {
  padding: 10px 12px;
  border-top: 1px solid var(--border-faint);
  color: var(--fg);
  vertical-align: middle;
}
.tbl tr:hover td { background: var(--bg-inset); }
.tbl-mono { font-family: var(--font-mono); font-size: 12.5px; }
.tbl-scroll { max-height: 360px; overflow-y: auto; }

/* ============================================================
   System list (Screen 4 left pane)
   ============================================================ */

.syslist {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  overflow: hidden;
}
.sysitem {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-faint);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 120ms;
}
.sysitem:last-child { border-bottom: 0; }
.sysitem:hover { background: var(--bg-inset); }
.sysitem.active {
  background: var(--accent-soft);
}
.sysitem-color {
  width: 8px; height: 36px;
  border-radius: 4px;
  flex-shrink: 0;
}
.sysitem-body { flex: 1; min-width: 0; }
.sysitem-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  color: var(--fg);
}
.sysitem-meta {
  font-size: 11.5px;
  color: var(--fg-muted);
  margin-top: 2px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.sysitem-meta span { display: inline-flex; align-items: center; gap: 3px; }

/* Substep nav for screen 4 */
.substep-nav {
  display: flex;
  gap: 4px;
  padding: 6px;
  background: var(--bg-inset);
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  margin-bottom: 24px;
  overflow-x: auto;
}
.substep-pill {
  flex: 1;
  padding: 8px 12px;
  border-radius: var(--r-xs);
  border: 0;
  background: transparent;
  color: var(--fg-muted);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
}
.substep-pill:hover { color: var(--fg); }
.substep-pill.active {
  background: var(--bg-elev);
  color: var(--fg);
  box-shadow: var(--shadow-sm);
}
.substep-pill .substep-num {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--border-strong);
  color: var(--bg-elev);
  font-size: 10.5px;
  display: grid; place-items: center;
  font-weight: 700;
}
.substep-pill.active .substep-num { background: var(--accent); color: white; }
.substep-pill.done .substep-num { background: var(--ok); color: white; }

/* ============================================================
   Source card (Screen 3)
   ============================================================ */

.srccard {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-elev);
  margin-bottom: 14px;
  overflow: hidden;
}
.srccard-head {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  background: var(--bg-elev);
}
.srccard-head:hover { background: var(--bg-inset); }
.srccard.expanded .srccard-head { border-bottom: 1px solid var(--border); }
.srccard-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: 12px;
  display: grid; place-items: center;
}
.srccard-info { flex: 1; }
.srccard-title { font-size: 13.5px; font-weight: 500; }
.srccard-stats {
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: 2px;
  font-family: var(--font-mono);
  display: flex;
  gap: 12px;
}
.srccard-body { padding: 20px 22px; }

/* ============================================================
   Empty state
   ============================================================ */

.empty {
  text-align: center;
  padding: 56px 30px;
  background: var(--bg-elev);
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-md);
}
.empty-icon {
  width: 56px; height: 56px;
  margin: 0 auto 14px;
  border-radius: var(--r-md);
  background: var(--bg-inset);
  display: grid; place-items: center;
  color: var(--fg-muted);
}
.empty-title { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.empty-desc {
  font-size: 13px;
  color: var(--fg-muted);
  margin: 0 0 18px;
  max-width: 380px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   JSON preview
   ============================================================ */

.json-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  overflow: auto;
  max-height: 600px;
  white-space: pre;
}
.tk-key { color: #7c5cff; }
[data-theme="dark"] .tk-key { color: #a78bfa; }
.tk-str { color: #16a34a; }
[data-theme="dark"] .tk-str { color: #4ade80; }
.tk-num { color: #d97706; }
[data-theme="dark"] .tk-num { color: #fbbf24; }
.tk-bool { color: #dc2626; }
[data-theme="dark"] .tk-bool { color: #f87171; }
.tk-punct { color: var(--fg-muted); }

/* Validation summary */
.vrow {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  margin-bottom: 4px;
  font-size: 13px;
}
.vrow.ok { color: var(--fg); }
.vrow.warn { background: var(--warn-soft); }
.vrow.err { background: var(--err-soft); }
.vrow-icon { flex-shrink: 0; margin-top: 1px; }
.vrow-icon.ok { color: var(--ok); }
.vrow-icon.warn { color: #ca8a04; }
.vrow-icon.err { color: var(--err); }

/* Plugins */
.plugin-card { margin-bottom: 14px; }
.plugin-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
}
.plugin-icon {
  width: 36px; height: 36px;
  border-radius: var(--r-sm);
  background: var(--bg-inset);
  display: grid; place-items: center;
  color: var(--fg-muted);
}
.plugin-card.enabled .plugin-icon { background: var(--accent-soft); color: var(--accent); }
.plugin-body {
  padding: 0 20px 20px;
  border-top: 1px solid var(--border-faint);
}

/* Stat box */
.statgrid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--bg-inset);
}
.stat-val {
  font-size: 22px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.stat-lbl {
  font-size: 11.5px;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* Filters bar */
.filterbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.search {
  flex: 1;
  min-width: 200px;
  position: relative;
}
.search-input {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 7px 12px 7px 32px;
  font-size: 13px;
  color: var(--fg);
}
.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--fg-muted);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--fg);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 100;
  animation: toast-in 200ms ease;
}
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Drawer */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 50;
  animation: fade 160ms ease;
}
.drawer {
  position: fixed;
  top: 0; bottom: 0; right: 0;
  width: 420px;
  max-width: 90vw;
  background: var(--bg-elev);
  border-left: 1px solid var(--border);
  z-index: 51;
  padding: 22px 24px;
  overflow-y: auto;
  animation: drawer-in 200ms ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes drawer-in {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  background: var(--bg-inset);
  color: var(--fg-muted);
  border: 1px solid var(--border);
}
.tag.purple { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-border); }
.tag.green { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.tag.yellow { background: var(--warn-soft); color: #ca8a04; border-color: transparent; }
.tag.red { background: var(--err-soft); color: var(--err); border-color: transparent; }

/* Disclosure */
.disclosure {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.disclosure-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  cursor: pointer;
  background: var(--bg-elev);
}
.disclosure-head:hover { background: var(--bg-inset); }
.disclosure-body { padding: 4px 16px 16px; border-top: 1px solid var(--border-faint); }

/* Mini bar chart */
.minibar {
  height: 8px;
  background: var(--bg-inset);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.minibar-fill {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  background: var(--accent);
  border-radius: 999px;
}

/* Misc */
.row { display: flex; align-items: center; gap: 10px; }
.col { display: flex; flex-direction: column; gap: 10px; }
.between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: 6px; }
.gap-md { gap: 12px; }
.gap-lg { gap: 20px; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.mt-sm { margin-top: 8px; }
.mt-md { margin-top: 16px; }
.mt-lg { margin-top: 24px; }
.mb-sm { margin-bottom: 8px; }
.mb-md { margin-bottom: 16px; }
.mb-lg { margin-bottom: 24px; }
.text-sm { font-size: 12.5px; }
.text-xs { font-size: 11.5px; }
  
/* ============================================================
   Side panels (Library, Settings)
   ============================================================ */
.side-panel {
  width: 340px;
  height: 100%;
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 24px 20px;
  flex-shrink: 0;
}

.side-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.draft-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-faint);
}

.draft-card-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
}

.draft-card-meta {
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: 2px;
}

/* ============================================================
   Standalone tool pages (Center-Frequency / Error calculators)
   ============================================================ */
.toolpage {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}
.toolpage-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}
.toolpage-brand { display: flex; align-items: center; gap: 11px; padding: 4px; border-radius: var(--r-md); transition: background 120ms; }
.toolpage-brand:hover { background: var(--bg-hover); }
.toolpage-brand img { width: 28px; height: 28px; border-radius: 8px; display: block; box-shadow: 0 2px 10px var(--accent-soft-strong); }
.toolpage-brand-text { display: flex; flex-direction: column; gap: 1px; line-height: 1.12; }
.toolpage-eyebrow {
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg-faint); font-weight: 700;
}
.toolpage-product { font-size: 14px; font-weight: 650; letter-spacing: -0.01em; color: var(--fg); }
.toolpage-bar-actions { display: flex; align-items: center; gap: 8px; }
.toolpage-main { flex: 1; padding: 40px 24px 64px; }
.toolpage-inner { max-width: 760px; margin: 0 auto; }
.toolpage-head { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 22px; }
.toolpage-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; flex-shrink: 0;
}
.toolpage-title { font-size: 24px; font-weight: 700; margin: 0 0 5px; letter-spacing: -0.01em; }
.toolpage-sub { font-size: 14px; color: var(--fg-muted); margin: 0; line-height: 1.6; }
.toolpage-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 24px; border-top: 1px solid var(--border);
  font-size: 12.5px; color: var(--fg-muted); flex-wrap: wrap;
}
.toolpage-footer svg { color: var(--ok); vertical-align: -2px; margin-right: 4px; }
.toolpage-footer-links { display: flex; gap: 16px; }
.toolpage-footer-links a { color: var(--fg-muted); }
.toolpage-footer-links a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.tool-toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--fg); color: var(--bg); border-radius: 8px;
  padding: 9px 16px; font-size: 13px; font-weight: 500;
  z-index: 200; box-shadow: 0 4px 12px rgba(0,0,0,0.18);
}

/* Error calculator inputs (shared in-app + standalone) */
.errorcalc-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.errorcalc-standalone {
  padding: 18px 20px; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-sm);
}

/* ============================================================
   Responsive — tablet + mobile
   ============================================================ */
.topbar-menu { display: none; }
.nav-backdrop { display: none; }

@media (max-width: 1024px) {
  /* Drop the persistent step-nav column; it becomes an off-canvas drawer. */
  .shell { grid-template-columns: 56px 1fr; }
  .topbar-menu {
    display: grid; place-items: center;
    width: 38px; height: 38px; margin-right: 6px; flex-shrink: 0;
    border: 0; background: transparent; color: var(--fg-muted);
    border-radius: var(--r-sm); cursor: pointer;
  }
  .topbar-menu:hover { background: var(--bg-hover); color: var(--fg); }
  .stepnav {
    position: fixed; top: 0; bottom: 0; left: 56px;
    width: 264px; z-index: 80;
    /* full width + the 56px left offset, so it's entirely off-screen when closed
       and never intercepts taps on the topbar hamburger */
    transform: translateX(calc(-100% - 60px));
    transition: transform 200ms ease;
    box-shadow: var(--shadow-lg);
  }
  .shell.nav-open .stepnav { transform: translateX(0); }
  .nav-backdrop {
    display: block; position: fixed; inset: 0; left: 56px;
    background: rgba(0,0,0,0.38); z-index: 75;
    opacity: 0; pointer-events: none; transition: opacity 200ms;
  }
  .shell.nav-open .nav-backdrop { opacity: 1; pointer-events: auto; }
  .rc-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
  .rc-grid.cols-4, .rc-grid.cols-6 { grid-template-columns: repeat(3, 1fr); }
  .canvas { padding: 24px 22px 80px; }
}

@media (max-width: 640px) {
  /* Content goes full width; the rail joins the off-canvas drawer so it no
     longer crowds the page or sits under the bottom action bar. */
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: fixed; top: 0; bottom: 0; left: 0; width: 56px; z-index: 85;
    transform: translateX(-120%);
    transition: transform 200ms ease;
    box-shadow: var(--shadow-lg);
  }
  .shell.nav-open .rail { transform: translateX(0); }
  .nav-backdrop { left: 0; }

  .topbar { height: 54px; padding: 0 10px; }
  .crumb-tail, .crumb-sep + .crumb-sep { display: none; }
  .crumbs { font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; }
  .canvas { padding: 16px 14px 104px; }
  .canvas-inner, .canvas-wide .canvas-inner { max-width: 100%; }
  .app-footer { display: none; }

  /* Action buttons → sticky bottom bar (thumb-reachable). */
  .topbar-actions {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
    background: var(--bg-elev); border-top: 1px solid var(--border);
    padding: 8px 12px; padding-bottom: max(8px, env(safe-area-inset-bottom));
    gap: 8px; flex-wrap: wrap; justify-content: flex-end;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
  }
  .topbar-actions .btn { padding: 9px 12px; }
  .topbar-actions .btn.primary { flex: 1 1 100%; justify-content: center; order: 9; }

  /* Single-column forms + grids. */
  .field-row { flex-direction: column; }
  .rc-grid.cols-2, .rc-grid.cols-3, .rc-grid.cols-4, .rc-grid.cols-6 { grid-template-columns: 1fr; }
  .systems-grid { grid-template-columns: 1fr !important; }
  .errorcalc-inputs { grid-template-columns: 1fr; }

  /* No iOS zoom on focus; bigger touch targets. */
  .input, .textarea, textarea, select { font-size: 16px; }
  .rail-btn { width: 40px; height: 40px; }

  /* Tool pages. */
  .toolpage-bar { padding: 12px 14px; }
  .toolpage-main { padding: 24px 14px 56px; }
  .toolpage-head { gap: 12px; margin-bottom: 18px; }
  .toolpage-title { font-size: 20px; }
}