/* ============================================================
   AM Demodulation Demo — style.css
   Dark-mode, glassmorphic, premium educational UI
   Extends the modulation demo design system
   ============================================================ */

/* ── Tokens ── */
:root {
  --bg: #0b0d14;
  --surface: #12151f;
  --surface2: #1a1e2e;
  --surface3: #222740;
  --border: rgba(255,255,255,0.07);
  --border-glow: rgba(99,102,241,0.35);

  /* Pipeline step colors */
  --pipe-in:  #a78bfa;   /* violet  — input s(t) */
  --pipe-s1:  #f59e0b;   /* amber   — after diode / after re-mod */
  --pipe-s2:  #38bdf8;   /* sky     — after LPF */
  --pipe-s3:  #34d399;   /* emerald — after HPF / output */

  --pipe-in-glow:  rgba(167,139,250,0.25);
  --pipe-s1-glow:  rgba(245,158,11,0.25);
  --pipe-s2-glow:  rgba(56,189,248,0.25);
  --pipe-s3-glow:  rgba(52,211,153,0.25);

  /* FDM channel colors (sync mode) */
  --ch1: #38bdf8;
  --ch1-glow: rgba(56,189,248,0.3);
  --ch2: #4ade80;
  --ch2-glow: rgba(74,222,128,0.3);
  --ch3: #fb923c;
  --ch3-glow: rgba(251,146,60,0.3);

  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99,102,241,0.3);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #475569;

  --green: #22c55e;
  --amber: #f59e0b;
  --red:   #ef4444;

  --radius: 14px;
  --radius-sm: 8px;
  --radius-xs: 5px;

  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;

  --sidebar-w: 360px;
  --header-h: 54px;
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface3); border-radius: 99px; }

/* ════════════════════════════════════════════
   HEADER
   ════════════════════════════════════════════ */
.app-header {
  height: var(--header-h);
  background: linear-gradient(180deg, #142233, #0d1620);
  border-bottom: 1px solid #22303f;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 20px;
  gap: 16px;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-right {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.header-badge {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 1.5px;
  padding: 5px 10px;
  border-radius: var(--radius-xs);
  text-transform: uppercase;
  box-shadow: 0 0 20px var(--accent-glow);
  flex-shrink: 0;
}

.header-title h1 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: 0;
}

.header-subtitle {
  font-size: 11px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
  display: block;
}

/* ── Mode Toggle ── */
.mode-toggle-wrap {
  display: flex;
  justify-content: center;
}

.mode-toggle {
  display: flex;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 3px;
  gap: 2px;
}

.mode-btn {
  background: transparent;
  border: none;
  border-radius: 99px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 18px;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.mode-btn:hover { color: var(--text-secondary); }
.mode-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 14px var(--accent-glow);
}

/* ── Status pills ── */
.mod-status-strip {
  display: flex;
  gap: 8px;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 5px 13px 5px 8px;
  font-size: 12px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.status-pill .status-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--surface3);
  transition: var(--transition);
}

.status-pill.pill-ok   .status-dot { background: var(--green); box-shadow: 0 0 8px var(--green); }
.status-pill.pill-ok   { color: var(--green); border-color: rgba(34,197,94,0.3); }

.status-pill.pill-over .status-dot { background: var(--red); box-shadow: 0 0 8px var(--red); }
.status-pill.pill-over { color: var(--red); border-color: rgba(239,68,68,0.3); animation: overmodPulse 1.4s infinite; }

/* ── Back button ── */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 11px 0 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color .15s, border-color .15s, background .15s;
}
.back-btn:hover {
  color: var(--text-primary);
  border-color: var(--border);
  background: var(--surface2);
}
.back-btn svg { flex-shrink: 0; opacity: 0.7; }

/* ════════════════════════════════════════════
   MAIN LAYOUT
   ════════════════════════════════════════════ */
.app-main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 13px;
  overflow-y: auto;
  animation: fadeInUp 0.4s ease both;
}

/* ── Plot panel ── */
.plot-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  animation: fadeInUp 0.4s 0.1s ease both;
}

/* ════════════════════════════════════════════
   PIPELINE CARD
   ════════════════════════════════════════════ */
.pipeline-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.pipeline-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.pipeline-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pipe-step {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 5px 8px;
  border-radius: var(--radius-xs);
  font-size: 11.5px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.pipe-step.pipe-active {
  background: var(--surface3);
  color: var(--text-primary);
}

.pipe-arrow {
  text-align: center;
  padding-left: 10px;
  color: var(--text-muted);
  font-size: 11px;
  line-height: 1;
}

.pipe-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pipe-in { background: var(--pipe-in); box-shadow: 0 0 6px var(--pipe-in-glow); }
.pipe-s1 { background: var(--pipe-s1); box-shadow: 0 0 6px var(--pipe-s1-glow); }
.pipe-s2 { background: var(--pipe-s2); box-shadow: 0 0 6px var(--pipe-s2-glow); }
.pipe-s3 { background: var(--pipe-s3); box-shadow: 0 0 6px var(--pipe-s3-glow); }

.eq-label-inline {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--mono);
}

.alpha-pill-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  gap: 8px;
}

/* α pill — always visible, color reacts to modulation index */
.alpha-pill {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 11px;
  border-radius: 99px;
  letter-spacing: 0.3px;
  transition: background 0.25s, color 0.25s, border-color 0.25s, box-shadow 0.25s;
  /* default: normal (α ≤ 1) */
  background: rgba(34,197,94,0.12);
  color: var(--green);
  border: 1px solid rgba(34,197,94,0.3);
}

.alpha-pill.pill-overmod {
  background: rgba(239,68,68,0.12);
  color: var(--red);
  border-color: rgba(239,68,68,0.4);
  animation: overmodPulse 1.4s infinite;
}

/* ── fc/fm separation ratio pill ── */
.ratio-pill {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  letter-spacing: 0.3px;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
  white-space: nowrap;
}
.ratio-pill.ratio-ok {
  background: rgba(34,197,94,0.12);
  color: var(--green);
  border: 1px solid rgba(34,197,94,0.3);
}
.ratio-pill.ratio-caution {
  background: rgba(245,158,11,0.12);
  color: var(--amber);
  border: 1px solid rgba(245,158,11,0.35);
}
.ratio-pill.ratio-bad {
  background: rgba(239,68,68,0.12);
  color: var(--red);
  border: 1px solid rgba(239,68,68,0.4);
  animation: overmodPulse 1.4s infinite;
}

/* ── Separation warning banner ── */
.env-sep-warn {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: 11px;
  line-height: 1.45;
  border: 1px solid;
  flex-shrink: 0;
}
.env-sep-warn svg { flex-shrink: 0; margin-top: 1px; }

.env-sep-warn.warn-caution {
  background: rgba(245,158,11,0.08);
  border-color: rgba(245,158,11,0.3);
  color: var(--amber);
}
.env-sep-warn.warn-bad {
  background: rgba(239,68,68,0.08);
  border-color: rgba(239,68,68,0.35);
  color: var(--red);
}

.equation-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.eq-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.eq-text {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--surface3);
  border-radius: var(--radius-xs);
  padding: 7px 10px;
  line-height: 1.6;
}


/* ════════════════════════════════════════════
   CONTROLS SECTION
   ════════════════════════════════════════════ */
.controls-section {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.section-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.input-dot  { background: var(--pipe-in); box-shadow: 0 0 6px var(--pipe-in-glow); }
.step1-dot  { background: var(--pipe-s1); box-shadow: 0 0 6px var(--pipe-s1-glow); }
.step2-dot  { background: var(--pipe-s2); box-shadow: 0 0 6px var(--pipe-s2-glow); }
.step3-dot  { background: var(--pipe-s3); box-shadow: 0 0 6px var(--pipe-s3-glow); }

/* ── Sliders ── */
.slider-group { display: flex; flex-direction: column; gap: 5px; }

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slider-header label {
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
}

.slider-header label sub { font-size: 9px; vertical-align: sub; }

.slider-val {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-light);
  font-weight: 500;
  min-width: 68px;
  text-align: right;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 99px;
  background: var(--surface3);
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid rgba(255,255,255,0.2);
  box-shadow: 0 0 10px var(--accent-glow);
  cursor: pointer;
  transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 16px var(--accent);
}

/* Per-slider thumb accent colors */
#env-am::-webkit-slider-thumb  { background: var(--pipe-in); box-shadow: 0 0 10px var(--pipe-in-glow); }
#env-fm::-webkit-slider-thumb  { background: var(--pipe-in); box-shadow: 0 0 10px var(--pipe-in-glow); }
#env-bias::-webkit-slider-thumb{ background: var(--pipe-s3); box-shadow: 0 0 10px var(--pipe-s3-glow); }
#env-ac::-webkit-slider-thumb  { background: var(--pipe-s1); box-shadow: 0 0 10px var(--pipe-s1-glow); }
#env-fc::-webkit-slider-thumb  { background: var(--pipe-s1); box-shadow: 0 0 10px var(--pipe-s1-glow); }
#sync-fc-slider::-webkit-slider-thumb { background: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }

.slider-ticks {
  position: relative;
  display: flex;
  justify-content: space-between;
  font-size: 9.5px;
  color: var(--text-muted);
  padding: 0 1px;
}

/* Continuous fc slider — extra top margin + hint text */
.sync-fc-slider-group {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.sync-fc-hint {
  font-size: 9.5px;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  opacity: 0.75;
  margin-top: 2px;
}

/* Reset button */
.reset-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 12px;
  padding: 9px 16px;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  letter-spacing: 0.3px;
}

.reset-btn:hover {
  background: var(--surface3);
  color: var(--text-primary);
  border-color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
}

/* ════════════════════════════════════════════
   STEP TOGGLE PILLS
   ════════════════════════════════════════════ */
.step-toggle-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-toggle-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  background: var(--surface3);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.step-toggle-pill:hover { border-color: rgba(255,255,255,0.12); }

.step-toggle-pill input[type="checkbox"] { display: none; }

.step-num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
  width: 18px;
  text-align: center;
}

.step1-pill .step-num { color: var(--pipe-s1); }
.step2-pill .step-num { color: var(--pipe-s2); }
.step3-pill .step-num { color: var(--pipe-s3); }

.step-name {
  flex: 1;
  font-size: 11.5px;
  color: var(--text-secondary);
  line-height: 1.3;
}

.step-name sub { font-size: 8.5px; }

/* Toggle track at the trailing edge */
.toggle-track {
  width: 30px;
  height: 16px;
  border-radius: 99px;
  background: var(--surface2);
  border: 1px solid var(--border);
  position: relative;
  flex-shrink: 0;
  transition: var(--transition);
}

.toggle-track::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: var(--transition);
}

.step-toggle-pill input:checked + .step-num + .step-name + .toggle-track,
.step-toggle-pill input:checked ~ .toggle-track {
  border-color: currentColor;
}

/* Step 1 on */
.step1-pill input:checked ~ .toggle-track {
  background: var(--pipe-s1);
  border-color: var(--pipe-s1);
  box-shadow: 0 0 8px var(--pipe-s1-glow);
}
/* Step 2 on */
.step2-pill input:checked ~ .toggle-track {
  background: var(--pipe-s2);
  border-color: var(--pipe-s2);
  box-shadow: 0 0 8px var(--pipe-s2-glow);
}
/* Step 3 on */
.step3-pill input:checked ~ .toggle-track {
  background: var(--pipe-s3);
  border-color: var(--pipe-s3);
  box-shadow: 0 0 8px var(--pipe-s3-glow);
}

.step-toggle-pill input:checked ~ .toggle-track::after {
  left: calc(100% - 13px);
  background: #fff;
}

/* Pill glow when active */
.step1-pill:has(input:checked) { border-color: rgba(245,158,11,0.3); background: rgba(245,158,11,0.07); }
.step2-pill:has(input:checked) { border-color: rgba(56,189,248,0.3); background: rgba(56,189,248,0.07); }
.step3-pill:has(input:checked) { border-color: rgba(52,211,153,0.3); background: rgba(52,211,153,0.07); }

/* LPF cutoff expandable row */
.lpf-cutoff-row {
  display: grid;
  grid-template-columns: 42px 1fr 62px;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  background: rgba(56,189,248,0.07);
  border: 1px solid rgba(56,189,248,0.2);
  border-radius: var(--radius-xs);
  margin-top: 2px;
}

.lpf-cutoff-row label {
  font-size: 10.5px;
  color: var(--pipe-s2);
  white-space: nowrap;
}

.lpf-cutoff-row label sub { font-size: 8px; vertical-align: sub; }

.fdm-val {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--accent-light);
  font-weight: 500;
  text-align: right;
  white-space: nowrap;
}

/* ════════════════════════════════════════════
   STEP STATUS BADGES (on chart cards)
   ════════════════════════════════════════════ */
.step-badge {
  margin-left: auto;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.8px;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
}

.step1-badge { background: rgba(245,158,11,0.15);  color: var(--pipe-s1); border: 1px solid rgba(245,158,11,0.3); }
.step2-badge { background: rgba(56,189,248,0.12);  color: var(--pipe-s2); border: 1px solid rgba(56,189,248,0.3); }
.step3-badge { background: rgba(52,211,153,0.12);  color: var(--pipe-s3); border: 1px solid rgba(52,211,153,0.3); }

/* Dimmed when step is off */
.step-off .chart-wrap { opacity: 0.35; }
.step-off .step-badge { opacity: 0.5; }
.step-off { border-color: var(--border) !important; }

/* ════════════════════════════════════════════
   CHANNEL TOGGLE (Sync: Tune to channel)
   ════════════════════════════════════════════ */
.type-toggle {
  display: flex;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.type-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 500;
  padding: 7px 4px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  text-align: center;
  line-height: 1.3;
}

.type-btn:hover { color: var(--text-secondary); background: var(--surface3); }
.type-btn.active { background: var(--surface3); color: var(--text-primary); font-weight: 600; }

.ch-sub {
  font-size: 9.5px;
  color: var(--text-muted);
  font-weight: 400;
}

.type-btn.active .ch-sub { color: var(--accent-light); }

/* ════════════════════════════════════════════
   FDM INFO CARD (sync mode, read-only)
   ════════════════════════════════════════════ */
.fdm-info-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 13px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.fdm-info-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.fdm-info-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.fdm-ch-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 3px;
}

.ch1-dot { background: var(--ch1); box-shadow: 0 0 5px var(--ch1-glow); }
.ch2-dot { background: var(--ch2); box-shadow: 0 0 5px var(--ch2-glow); }
.ch3-dot { background: var(--ch3); box-shadow: 0 0 5px var(--ch3-glow); }

.fdm-info-note {
  font-size: 10px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 6px;
  margin-top: 2px;
}

/* ════════════════════════════════════════════
   TAB BAR
   ════════════════════════════════════════════ */
.tab-bar {
  display: flex;
  gap: 4px;
  padding: 12px 20px 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 9px 18px 10px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  bottom: -1px;
}

.tab-btn svg { flex-shrink: 0; }
.tab-btn:hover { color: var(--text-secondary); background: var(--surface2); }
.tab-btn.active {
  color: var(--accent-light);
  background: var(--bg);
  border-color: var(--border);
  border-bottom-color: var(--bg);
}

/* ════════════════════════════════════════════
   TAB CONTENT & CHART GRIDS
   ════════════════════════════════════════════ */
.tab-content {
  display: none;
  flex: 1;
  overflow: hidden;
}

.tab-content.active { display: flex; flex-direction: column; }

/* Envelope: 4-row time grid */
.env-grid {
  flex: 1;
  display: grid;
  grid-template-rows: 1fr 1fr 1fr 1fr;
  gap: 0;
  padding: 10px 14px;
  overflow: hidden;
  height: 100%;
}

/* Envelope: 2-row freq grid */
.env-grid-freq {
  flex: 1;
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 0;
  padding: 10px 14px;
  overflow: hidden;
  height: 100%;
}

/* Sync: 4-row freq grid */
.sync-grid {
  flex: 1;
  display: grid;
  grid-template-rows: 1fr 1fr 1fr 1fr;
  gap: 0;
  padding: 10px 14px;
  overflow: hidden;
  height: 100%;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 13px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 0;
  transition: border-color 0.2s;
}

.chart-card:hover { border-color: var(--border-glow); }

.chart-label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
  text-transform: uppercase;
  flex-shrink: 0;
}



.chart-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chart-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
}

.chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}

/* ════════════════════════════════════════════
   SYNC SIDEBAR (slightly wider)
   ════════════════════════════════════════════ */
.sync-sidebar {
  width: var(--sidebar-w);
}

/* ════════════════════════════════════════════
   ANIMATIONS
   ════════════════════════════════════════════ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes overmodPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239,68,68,0.3); }
  50%       { box-shadow: 0 0 14px 3px rgba(239,68,68,0.35); }
}