/* ===========================================================
   Simulasi Osiloskop — Style
   Tema: panel instrumen makmal (bezel gelap, skrin phosphor hijau)
   =========================================================== */

:root {
  --bezel-dark: #1c1f22;
  --bezel-darker: #121416;
  --bezel-light: #2b2f33;
  --panel-accent: #3a4046;
  --screen-bg: #04170a;
  --amber: #ffb84d;
  --ch1-color: #ffe066;
  --ch2-color: #66d9ff;
  --text-light: #e9edf1;
  --text-muted: #9aa4ad;
  --radius-md: 10px;
  --radius-lg: 16px;
  /* Nota: nombor2 readout guna fon SAMA dgn UI (sans-serif), BUKAN monospace —
     fon monospace (cth. DejaVu/Liberation Mono) nampak "kembang"/tebal berbanding
     fon UI sekeliling walaupun lebar aksara hampir sama. tabular-nums kekalkan
     lebar aksara tetap supaya nombor x "goyang" bila nilai berubah. */
  --font-mono: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Elak nombor "kembang"/goyang bila nilai berubah (readout dikemaskini setiap bingkai) —
   paksa lebar aksara tetap (tabular) & elak fon monospace yang nampak lebih tebal/lebar. */
.status-strip, .status-readout, .measure-row, .control-row output,
.lcd-readout, .cal-status, .hint-text, #ampQPointReadout, #psuRippleReadout {
  font-variant-numeric: tabular-nums;
  font-stretch: normal;
  font-weight: 500;
  letter-spacing: 0.1px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 50% -10%, #2a2e33, #0c0d0f 65%);
  color: var(--text-light);
  min-height: 100vh;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  background: linear-gradient(180deg, #23262a, #17191c);
  border-bottom: 2px solid #000;
  box-shadow: 0 2px 12px rgba(0,0,0,0.5);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-icon { font-size: 20px; filter: drop-shadow(0 0 6px rgba(102,217,255,0.6)); }
.brand h1 { margin: 0; font-size: 15px; letter-spacing: 0.4px; }
.brand p { display: none; }
.brand-credit {
  display: block !important;
  margin: 2px 0 0 !important;
  font-size: 10.5px !important;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: #ffcf66;
}
.header-actions { display: flex; gap: 8px; align-items: center; }

.btn {
  display: inline-block;
  background: linear-gradient(180deg, #3a3f45, #26292c);
  color: var(--text-light);
  border: 1px solid #000;
  border-top-color: #4a4f55;
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 12px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 2px 0 #000, inset 0 1px 0 rgba(255,255,255,0.05);
  transition: transform 0.05s ease, filter 0.15s ease;
}
.btn:hover { filter: brightness(1.15); }
.btn:active { transform: translateY(1px); box-shadow: 0 1px 0 #000; }
.btn-accent {
  background: linear-gradient(180deg, #ffb84d, #e0982e);
  color: #211500;
  border-top-color: #ffd28a;
  font-weight: 600;
}
.btn-toggle { width: 100%; font-weight: 700; letter-spacing: 1px; }
.btn-toggle.btn-stopped { background: linear-gradient(180deg, #ff6b6b, #c23a3a); color: #fff; }

#modeSelect {
  background: var(--bezel-light);
  color: var(--text-light);
  border: 1px solid #000;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
}

/* ---------- Layout ---------- */
.stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  max-width: 1400px;
  margin: 0 auto;
}

/* ---------- Instrument Unit (shared shell for Scope & Generator) ---------- */
.instrument-unit {
  background: linear-gradient(180deg, #23262a, #17191a);
  border: 1px solid #000;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 22px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
  overflow: hidden;
}

.unit-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 14px;
  background: linear-gradient(180deg, #2c3034, #1d2023);
  border-bottom: 2px solid #000;
}
.unit-header h2 { margin: 0; font-size: 13px; letter-spacing: 0.3px; }
.unit-sub { font-size: 11px; color: var(--text-muted); margin-left: auto; }
.unit-badge {
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 20px;
}
.btn-power {
  font-size: 10.5px;
  font-weight: 800;
  padding: 4px 9px;
  letter-spacing: 0.5px;
}
.btn-power.on { background: linear-gradient(180deg, #2f8f52, #1c5c33); border-top-color: #4fce7f; color: #eaffef; }
.btn-power.off { background: linear-gradient(180deg, #4a2020, #2a1010); border-top-color: #6a3030; color: #ffb3b3; }

.btn-autoset {
  font-size: 10.5px;
  font-weight: 800;
  padding: 4px 9px;
  letter-spacing: 0.3px;
  background: linear-gradient(180deg, #2e5c8f, #1a3a5c);
  border-top-color: #5fa8f5;
  color: #eaf4ff;
}
.btn-autoset:hover { background: linear-gradient(180deg, #3a6ea8, #234a72); }
.btn-autoset:active { transform: translateY(1px); }

.header-btn-group { display: flex; align-items: center; gap: 6px; }
/* Semasa AR, kumpulan butang ni terapung sekali dgn panel kawalan kiri (bukan lagi
   di dalam header yg disembunyikan), jadi letak susunan lebih lapang & jelas ditekan. */
.ar-floating-panel > .header-btn-group,
#unit1FloatWrapper > .header-btn-group {
  justify-content: center;
  padding: 6px 4px 10px;
}
.ar-floating-panel > .header-btn-group .btn,
#unit1FloatWrapper > .header-btn-group .btn {
  font-size: 12px;
  padding: 7px 14px;
}

.scope-unit.powered-off .scope-body .control-grid,
.scope-unit.powered-off .status-strip {
  opacity: 0.32;
  pointer-events: none;
  filter: grayscale(0.6);
}

.unit-badge-scope { background: rgba(102, 217, 255, 0.18); color: #7fe3ff; border: 1px solid rgba(102,217,255,0.35); }
.unit-badge-gen { background: rgba(255, 184, 77, 0.18); color: #ffcf8a; border: 1px solid rgba(255,184,77,0.35); }
.unit-badge-psu { background: rgba(140, 255, 174, 0.18); color: #8cffae; border: 1px solid rgba(140,255,174,0.35); }

.scope-body {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 8px;
  padding: 8px;
  align-items: stretch;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 7px;
  align-content: start;
}
.measure-card { grid-column: span 2; }

@media (max-width: 1200px) {
  .scope-body { grid-template-columns: 1fr; }
  .control-grid { grid-template-columns: repeat(4, 1fr); }
  .measure-card { grid-column: span 4; }
}
@media (max-width: 800px) {
  .control-grid { grid-template-columns: repeat(2, 1fr); }
  .measure-card { grid-column: span 2; }
  .gen-body { grid-template-columns: 1fr !important; }
}

.hint-text {
  margin: 5px 0 0;
  font-size: 10px;
  color: var(--text-muted);
  line-height: 1.35;
  padding-top: 5px;
  border-top: 1px dashed rgba(255,255,255,0.08);
}

.ch-circuit-note {
  display: none;
  color: #8cffae;
  border-top-color: rgba(140,255,174,0.25);
}
.ch-circuit-note.show { display: block; }

/* ---------- Unit 2 header: suis tab Penjana Isyarat / Litar ---------- */
.source-tabs { display: flex; gap: 6px; margin-left: auto; }
.tab-btn {
  background: #1a1c1f;
  color: var(--text-muted);
  border: 1px solid #000;
  border-radius: 7px;
  padding: 5px 11px;
  font-size: 11.5px;
  cursor: pointer;
  transition: filter 0.15s ease;
}
.tab-btn:hover { filter: brightness(1.2); }
.tab-btn.active {
  background: linear-gradient(180deg, #ffb84d, #e0982e);
  color: #211500;
  font-weight: 700;
  border-color: #000;
}

/* ---------- Litar Bekalan Kuasa (tab dalam Unit 2) ---------- */
.psu-body { padding: 14px; display: flex; flex-direction: column; gap: 12px; }

.psu-probe-select {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.probe-pick {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #0d0f11;
  border: 1px solid #000;
  border-radius: 8px;
  padding: 7px 10px;
}
.probe-pick label { font-size: 11.5px; color: var(--text-muted); }
.probe-pick select {
  background: var(--bezel-light);
  color: var(--text-light);
  border: 1px solid #000;
  border-radius: 6px;
  padding: 5px 7px;
  font-size: 11.5px;
}
.probe-pick-ch1 { border-left: 3px solid var(--ch1-color); }
.probe-pick-ch2 { border-left: 3px solid var(--ch2-color); }

.psu-schematic-frame {
  background: #04170a;
  border: 1px solid #000;
  border-radius: 10px;
  padding: 8px;
  box-shadow: inset 0 0 30px rgba(0,0,0,0.7);
}
#psuSchematic, #ampSchematic { width: 100%; height: auto; display: block; }

/* Titik probe pada skematik: tidak aktif = kelabu kecil */
#psuSchematic .probe-dot, #ampSchematic .probe-dot { fill: #3a4046; stroke: #5b6a70; stroke-width: 1.5; transition: fill 0.15s ease; }
#psuSchematic .badge, #ampSchematic .badge { display: none; }
#psuSchematic .badge-text, #ampSchematic .badge-text { display: none; font-size: 9px; font-weight: 800; text-anchor: middle; fill: #1a1c1f; }
#psuSchematic .probe-node.active-ch1 .probe-dot, #ampSchematic .probe-node.active-ch1 .probe-dot { fill: var(--ch1-color); stroke: var(--ch1-color); }
#psuSchematic .probe-node.active-ch2 .probe-dot, #ampSchematic .probe-node.active-ch2 .probe-dot { fill: var(--ch2-color); stroke: var(--ch2-color); }
#psuSchematic .probe-node.active-ch1 .badge.badge-ch1,
#psuSchematic .probe-node.active-ch1 .badge-text.badge-ch1,
#ampSchematic .probe-node.active-ch1 .badge.badge-ch1,
#ampSchematic .probe-node.active-ch1 .badge-text.badge-ch1 { display: block; fill: var(--ch1-color); }
#psuSchematic .probe-node.active-ch1 .badge-text.badge-ch1,
#ampSchematic .probe-node.active-ch1 .badge-text.badge-ch1 { fill: #4a3b00; }
#psuSchematic .probe-node.active-ch2 .badge.badge-ch2,
#psuSchematic .probe-node.active-ch2 .badge-text.badge-ch2,
#ampSchematic .probe-node.active-ch2 .badge.badge-ch2,
#ampSchematic .probe-node.active-ch2 .badge-text.badge-ch2 { display: block; fill: var(--ch2-color); }
#psuSchematic .probe-node.active-ch2 .badge-text.badge-ch2,
#ampSchematic .probe-node.active-ch2 .badge-text.badge-ch2 { fill: #003a4a; }

.psu-controls {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}
@media (max-width: 1200px) {
  .psu-controls { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 800px) {
  .psu-controls { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Cable Rack (between the two units) ---------- */
.cable-rack {
  background: #0d0f11;
  border: 1px dashed rgba(255,255,255,0.15);
  border-radius: var(--radius-md);
  padding: 6px 14px 7px;
}
.cable-rack-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.cable-rack-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
@media (max-width: 900px) {
  .cable-rack-row { grid-template-columns: 1fr; }
}

/* ---------- Generator Unit ---------- */
.gen-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 10px;
}

.gen-channel {
  background: linear-gradient(180deg, #24272b, #1a1c1f);
  border: 1px solid #000;
  border-radius: var(--radius-md);
  padding: 8px 12px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.04);
}
.gen-ch1 { border-left: 3px solid var(--ch1-color); }
.gen-ch2 { border-left: 3px solid var(--ch2-color); }

.gen-lcd {
  display: flex;
  flex-direction: column;
  gap: 3px;
  background: #04170a;
  border: 1px solid #000;
  border-radius: 8px;
  padding: 5px 8px;
  margin-bottom: 5px;
  box-shadow: inset 0 0 18px rgba(0,0,0,0.7);
}
.lcd-chip {
  align-self: flex-start;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 2px 7px;
  border-radius: 4px;
}
.lcd-chip.chip-ch1 { background: var(--ch1-color); color: #4a3b00; }
.lcd-chip.chip-ch2 { background: var(--ch2-color); color: #003a4a; }
.lcd-readout {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #8CFFAE;
  text-shadow: 0 0 6px rgba(140,255,174,0.6);
  letter-spacing: 0.2px;
}

/* ---------- Scope Panel (CRT body) ---------- */
.scope-panel {
  background: linear-gradient(180deg, var(--bezel-light), var(--bezel-dark) 40%, var(--bezel-darker));
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow:
    0 14px 28px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.06),
    inset 0 -2px 6px rgba(0,0,0,0.6);
  border: 1px solid #000;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.crt-frame {
  position: relative;
  background: #000;
  border-radius: var(--radius-md);
  padding: 8px;
  box-shadow:
    inset 0 0 0 3px #05060a,
    inset 0 0 40px rgba(0,0,0,0.9),
    0 0 0 6px #26292d,
    0 0 0 8px #000;
  flex: 1;
  min-height: 260px;
  max-height: 340px;
  display: flex;
}

#scopeCanvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 4px;
  background: var(--screen-bg);
  box-shadow: inset 0 0 60px rgba(0,0,0,0.85);
}

.crt-overlay {
  position: absolute;
  inset: 10px;
  pointer-events: none;
  border-radius: 4px;
  box-shadow: inset 0 0 90px rgba(0,0,0,0.65);
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(0,0,0,0.06) 0px,
      rgba(0,0,0,0.06) 1px,
      transparent 2px,
      transparent 3px
    );
  mix-blend-mode: multiply;
}

.status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
  align-items: center;
  padding: 5px 12px;
  background: #0d0f11;
  border-radius: 8px;
  border: 1px solid #000;
  font-family: var(--font-mono);
  font-size: 11px;
}

.status-pill {
  padding: 3px 10px;
  border-radius: 20px;
  background: #2b2f33;
  color: var(--text-muted);
  font-weight: 700;
  letter-spacing: 0.5px;
}
.status-run { background: #1c4d2e; color: #7CFC9A; box-shadow: 0 0 8px rgba(124,252,154,0.5); }
.status-stop { background: #5a1c1c; color: #ff9a9a; }
.status-trig-ok { background: #1c4d2e; color: #7CFC9A; }

.status-readout { color: var(--text-muted); }
.status-readout::before { content: "•"; margin-right: 8px; color: #444; }

/* ---------- Control Deck ---------- */
.control-deck {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-card {
  background: linear-gradient(180deg, #24272b, #1a1c1f);
  border: 1px solid #000;
  border-top-color: #35393e;
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.04);
}

.control-card h2 {
  margin: 0 0 12px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Kad padat digunakan dalam .control-grid supaya Osiloskop muat dalam satu skrin */
.control-card.compact {
  padding: 7px 10px;
}
.control-card.compact h2 {
  font-size: 10.5px;
  margin: 0 0 5px;
  gap: 5px;
  letter-spacing: 0.5px;
}
.control-card.compact .control-row {
  grid-template-columns: 62px 1fr 42px;
  gap: 5px;
  margin-bottom: 4px;
}
.control-card.compact .control-row label { font-size: 10.5px; }
.control-card.compact .control-row select,
.control-card.compact .control-row output { font-size: 10.5px; padding: 4px 5px; }
.control-card.compact .probe-warning { font-size: 9.5px; padding: 5px 7px; margin: -2px 0 6px; }
.control-card.compact .chip { font-size: 9.5px; padding: 1px 6px; }

.chip {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.chip-ch1 { background: var(--ch1-color); color: #4a3b00; }
.chip-ch2 { background: var(--ch2-color); color: #003a4a; }

.channel-card.ch1 { border-left: 3px solid var(--ch1-color); }
.channel-card.ch2 { border-left: 3px solid var(--ch2-color); }

.control-row {
  display: grid;
  grid-template-columns: 100px 1fr 52px;
  align-items: center;
  gap: 8px;
  margin-bottom: 7px;
}
.control-row:last-child { margin-bottom: 0; }

.control-row label {
  font-size: 11.5px;
  color: var(--text-muted);
}

.control-row select {
  grid-column: 2 / 4;
  background: var(--bezel-light);
  color: var(--text-light);
  border: 1px solid #000;
  border-radius: 6px;
  padding: 5px 7px;
  font-size: 11.5px;
}

.control-row input[type="checkbox"] {
  grid-column: 2 / 4;
  justify-self: start;
  width: 18px;
  height: 18px;
  accent-color: var(--amber);
}

.control-row input[type="range"] {
  grid-column: 2 / 3;
  -webkit-appearance: none;
  appearance: none;
  height: 5px;
  border-radius: 4px;
  background: linear-gradient(180deg, #0c0d0f, #26292c);
  border: 1px solid #000;
  outline: none;
}
.control-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff, var(--amber) 60%, #a8650a);
  border: 1px solid #402700;
  cursor: pointer;
  box-shadow: 0 0 4px rgba(255,184,77,0.6);
}
.control-row input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff, var(--amber) 60%, #a8650a);
  border: 1px solid #402700;
  cursor: pointer;
}

.control-row output {
  grid-column: 3 / 4;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-light);
  text-align: right;
  background: #0d0f11;
  border-radius: 4px;
  padding: 3px 6px;
  border: 1px solid #000;
}

/* ---------- Penjana Isyarat & Probe (kabel) ---------- */
.gen-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--amber);
  margin: 14px 0 8px;
  padding-top: 10px;
  border-top: 1px dashed rgba(255,255,255,0.08);
}
.control-card h2 + .gen-label { margin-top: 0; padding-top: 0; border-top: none; }

.probe-cable {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: #14171a;
  border: 1px solid #000;
  border-radius: 8px;
  flex-wrap: wrap;
}
.cable-jack {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: #cfd6dc;
  background: linear-gradient(180deg, #3a3f45, #26292c);
  border: 1px solid #000;
  border-radius: 4px;
  padding: 5px 7px;
  white-space: nowrap;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
}
.touch-jack {
  border: 1px solid var(--amber);
  color: #ffd9a0;
  background: linear-gradient(180deg, #4a3a1f, #2c2210);
  cursor: help;
}
.cable-wire {
  flex: 1;
  min-width: 90px;
  height: 34px;
  position: relative;
}
.cable-wire-svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}
/* Kabel probe bergaya sebenar: badan kelabu logam + hujung BNC/pen,
   jalur/hujung berwarna ikut status sambungan (hijau=tersambung, merah=tidak). */
.wire-path {
  stroke: #5a5d60;
  transition: stroke 0.2s, opacity 0.2s;
}
.wire-body { fill: #8f9295; }
.wire-body-shade { fill: #64676a; }
.wire-nose { fill: #3a3c3e; }
.status-fill {
  fill: #2fbf5f;
  filter: drop-shadow(0 0 3px rgba(60,220,130,0.85));
  transition: fill 0.2s;
}
.status-tip { filter: drop-shadow(0 0 4px rgba(60,220,130,0.9)); }

.probe-cable.unplugged .wire-path {
  stroke: #4a3030;
  stroke-dasharray: 3 5;
  opacity: 0.6;
}
.probe-cable.unplugged .status-fill {
  fill: #c23a3a;
  filter: drop-shadow(0 0 3px rgba(255,90,90,0.75));
}
.probe-cable.unplugged .status-tip { filter: drop-shadow(0 0 4px rgba(255,90,90,0.8)); }

/* ---------- Seret & lepas hujung probe (drag-and-drop) ---------- */
.probe-tip-handle {
  fill: transparent;
  cursor: grab;
  touch-action: none;
}
.probe-tip-handle:hover ~ .status-tip,
.wire-end-right:has(.probe-tip-handle:hover) .status-tip {
  filter: drop-shadow(0 0 8px rgba(255,255,255,0.9));
}
body.probe-dragging { cursor: grabbing !important; }
body.probe-dragging * { cursor: grabbing !important; }

.probe-drop-pad {
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.15s, filter 0.15s;
}
.probe-drop-pad.probe-drop-hover {
  box-shadow: 0 0 0 2px #fff, 0 0 14px rgba(255,255,255,0.8);
  transform: scale(1.08);
}
.gen-out-pad {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  align-self: flex-start;
  font-size: 8.5px;
  font-weight: 800;
  letter-spacing: 0.4px;
  padding: 2px 6px;
  border-radius: 10px;
  background: #1c4d2e;
  color: #9CFFB8;
  border: 1px solid #2fbf5f;
}

/* Titik nod litar/penguat & pad GEN/CAL — bagi isyarat visual yg jelas mereka
   boleh "disentuh" oleh probe semasa mengheret. */
.probe-node .probe-dot { cursor: pointer; transition: r 0.15s; }
.probe-node.probe-drop-hover .probe-dot {
  r: 8;
  filter: drop-shadow(0 0 8px rgba(255,255,255,0.9));
}

/* Ghost hujung probe yg ikut kursor semasa diheret + garis panduan putus-putus */
#probeDragGhost {
  position: fixed;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff, #ffd76b 60%, #b9862a);
  box-shadow: 0 0 10px rgba(255, 215, 107, 0.9);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  display: none;
}
#probeDragOverlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  display: none;
}
#probeDragOverlay path {
  fill: none;
  stroke: #ffd76b;
  stroke-width: 2;
  stroke-dasharray: 6 5;
  opacity: 0.85;
}

.btn-plug {
  font-size: 12px;
  padding: 7px 12px;
  white-space: nowrap;
}
.control-row .btn-plug { grid-column: 2 / 4; justify-self: start; }
.btn-plug.plugged { background: linear-gradient(180deg, #2f8f52, #1c5c33); border-top-color: #4fce7f; }
.btn-plug.unplugged { background: linear-gradient(180deg, #8f2f2f, #5c1c1c); border-top-color: #ce4f4f; }

.probe-warning {
  display: none;
  font-size: 11.5px;
  color: #ffd27a;
  background: rgba(255, 184, 77, 0.12);
  border: 1px solid rgba(255, 184, 77, 0.35);
  border-radius: 6px;
  padding: 7px 10px;
  margin: -2px 0 10px;
  line-height: 1.4;
}
.probe-warning.show { display: block; }

/* ---------- Kalibrasi Probe (CAL) ---------- */
.cal-block {
  margin-top: 2px;
  padding-top: 5px;
  border-top: 1px dashed rgba(255,255,255,0.12);
}
.cal-trim-row { display: none; }
.cal-trim-row.show { display: grid; }
.cal-status {
  font-size: 10.5px;
  line-height: 1.4;
  padding: 5px 8px;
  border-radius: 6px;
  margin-top: 2px;
  min-height: 0;
}
.cal-status:empty { padding: 0; margin-top: 0; }
.cal-status.cal-ok {
  color: #8dffb0;
  background: rgba(80, 240, 150, 0.1);
  border: 1px solid rgba(80, 240, 150, 0.3);
}
.cal-status.cal-bad {
  color: #ffd27a;
  background: rgba(255, 184, 77, 0.12);
  border: 1px solid rgba(255, 184, 77, 0.35);
}
.cal-terminal-badge {
  display: inline-block;
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 5px;
  background: rgba(120, 255, 180, 0.12);
  border: 1px solid rgba(120, 255, 180, 0.35);
  color: #a8ffc6;
}
.cable-rack-title { font-size: 11.5px; }

/* ---------- Measurements ---------- */
.measure-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px 8px;
  margin-bottom: 8px;
}
@media (max-width: 800px) {
  .measure-grid { grid-template-columns: repeat(2, 1fr); }
}
.measure-row {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  background: #0d0f11;
  border: 1px solid #000;
  border-radius: 6px;
  padding: 5px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
}
.measure-row span { color: var(--text-muted); }
.measure-row b { color: var(--text-light); }
.measure-row.ch1-color b { color: var(--ch1-color); }
.measure-row.ch2-color b { color: var(--ch2-color); }
.measure-row.muted { grid-column: 1 / -1; justify-content: center; color: var(--text-muted); }
.measure-row.measure-warn {
  grid-column: 1 / -1;
  background: rgba(255, 184, 77, 0.12);
  border-color: rgba(255, 184, 77, 0.4);
}
.measure-row.measure-warn b { color: #ffd27a !important; }
.measure-row.measure-suspect {
  border: 1px dashed rgba(255, 184, 77, 0.6);
  background: rgba(255, 184, 77, 0.06);
}
.measure-row.measure-suspect b::after {
  content: ' ⚠️';
}

/* ---------- Modals ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal-backdrop.open { display: flex; }

.modal {
  background: linear-gradient(180deg, #24272b, #1a1c1f);
  border: 1px solid #000;
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 82vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 60px rgba(0,0,0,0.6);
}
.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid #000;
  background: #17191c;
}
.modal-head h2 { margin: 0; font-size: 16px; }
.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
}
.btn-close:hover { color: var(--text-light); }
.modal-body {
  padding: 18px 22px;
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-light);
}
.modal-body h3 { color: var(--amber); margin: 18px 0 6px; font-size: 14px; }
.modal-body h3:first-child { margin-top: 0; }
.modal-body p { margin: 4px 0; color: #cfd6dc; }

.exercise-card {
  background: #0d0f11;
  border: 1px solid #000;
  border-left: 3px solid var(--amber);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.exercise-card h3 { margin: 0 0 8px; color: var(--amber); font-size: 14px; }
.exercise-card .ex-brief { color: #cfd6dc; margin: 0 0 8px; }
.exercise-card .ex-task { margin: 0 0 8px; }
.exercise-card details { font-size: 13px; color: var(--text-muted); }
.exercise-card summary { cursor: pointer; color: #66d9ff; }
.exercise-card details p { margin: 6px 0 0; color: #cfd6dc; }

/* ---------- Footer ---------- */
.app-footer {
  text-align: center;
  padding: 22px;
  color: var(--text-muted);
  font-size: 12px;
}
.footer-credit {
  margin-top: 6px !important;
  font-size: 12px;
  color: #ffcf66;
  letter-spacing: 0.3px;
}
.footer-credit strong { color: #ffe9b3; }

/* =====================================================
   Mod AR (WebXR) — panel kawalan terapung di kiri/kanan skrin + butang keluar
   ===================================================== */

/* Sembunyi secara default (mod 2D biasa) — hanya nampak selepas
   body dapat class "ar-mode" (dipasang oleh js/ar-session.js bila sesi AR
   berjaya dimulakan). */
#arExitBtn, #arHint { display: none; }

/* WAJIB ada rule ni — tanpanya butang keluar AR kekal tersembunyi
   selama-lamanya walaupun ar-mode aktif. */
body.ar-mode #arExitBtn { display: block; }

#arExitBtn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 60;
  background: rgba(140, 30, 30, 0.9);
  color: #fff;
  border: 1px solid #000;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

#arHint {
  position: fixed;
  top: 56px;
  left: 12px;
  right: 12px;
  z-index: 55;
  text-align: center;
  color: #cfe9ff;
  font-size: 13px;
  text-shadow: 0 1px 3px rgba(0,0,0,0.9);
}

/* Bila mod AR aktif: latar telus (kamera passthrough kelihatan), dan
   #appRoot disembunyikan terus — SEMUA bahagian interaktifnya (kawalan Unit 1,
   rak kabel, Unit 2) sudah dialihkan (reparent) jadi panel terapung 3D
   berasingan oleh js/ar-session.js, jadi tiada apa lagi tertinggal dlm
   #appRoot yg perlu dipaparkan sbg "laci". */
body.ar-mode {
  background: transparent !important;
}
body.ar-mode #appRoot {
  display: none;
}

/* Panel terapung generik (kawalan Unit 1 + rak kabel di KIRI skrin osiloskop,
   Unit 2/Penjana-Litar-Penguat di KANAN) — kedudukan skrin setiap satu
   dikemaskini setiap bingkai oleh ar-session.js ikut unjuran titik jangkar
   3D masing2, supaya ia "terpaku" di tempat yg sama dlm bilik sebenar walau
   kamera digerakkan. Muncul terus, TIADA butang/laci diperlukan. */
.ar-floating-panel {
  position: fixed;
  z-index: 55;
  width: min(340px, 80vw);
  max-height: 74vh;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  background: #101214;
  box-shadow: 0 10px 32px rgba(0,0,0,0.65);
  border-radius: 14px;
  padding: 8px;
  transition: opacity 0.15s ease;
}
/* Panel jauh lebih sempit terapung dlm AR drpd susun atur biasa (yg direka
   utk skrin penuh) — paksa satu lajur & lipat (wrap) SECARA TETAP (bukan
   bergantung pada media query lebar viewport, sbb lebar viewport peranti
   semasa sesi immersive-ar tak semestinya sepadan lebar panel terapung yg
   sempit ni — kalau tak dipaksa, kandungan melimpah & separuh je nampak). */
.ar-floating-panel .unit-header { flex-wrap: wrap; row-gap: 6px; }
.ar-floating-panel .source-tabs { flex-wrap: wrap; margin-left: 0; width: 100%; }
.ar-floating-panel .unit-sub { margin-left: 0; }
.ar-floating-panel .control-grid,
.ar-floating-panel .gen-body,
.ar-floating-panel .psu-controls { grid-template-columns: 1fr !important; }
.ar-floating-panel .measure-card { grid-column: span 1 !important; }
.ar-floating-panel .psu-probe-select { flex-direction: column; align-items: stretch; }
.ar-floating-panel .cable-rack-row { grid-template-columns: 1fr !important; }