:root {
  --bg0: #00251a;
  --bg1: #004d40;
  --ink: #e6eeeb;
  --muted: #8aa39a;
  --line: rgba(230, 238, 235, 0.1);
  --card: #1a1a1a;
  --card-border: #00695c;
  --teal: #00897b;
  --teal-deep: #00695c;
  --warn: #c4a35a;
  --bad: #c45a5a;
  --ok: #4caf50;
  --font-display: "Sora", sans-serif;
  --font-body: "DM Sans", sans-serif;

  --charging-glow-color: 0, 215, 145;
  --charging-dots-color: 0, 255, 95;
  --balancing-snake-color: 0, 255, 199;
  --charging-dots-opacity: 0.7;
  --charging-pulse-opacity: 0.7;
  --charging-dot-size: 10px;

  --glow-size-1: 6px;
  --glow-width-1: 1px;
  --glow-opacity-1: 0.3;
  --glow-size-2: 12px;
  --glow-width-2: 2px;
  --glow-opacity-2: 0.2;
  --glow-size-3: 10px;
  --glow-width-3: 2px;
  --glow-opacity-3: 0.4;
  --glow-size-4: 18px;
  --glow-width-4: 3px;
  --glow-opacity-4: 0.3;
  --glow-opacity-inset-1: 0.1;
  --glow-opacity-inset-2: 0.15;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  height: 100dvh;
  max-height: 100dvh;
  color: var(--ink);
  font-family: var(--font-body);
  background: linear-gradient(135deg, var(--bg1) 0%, var(--bg0) 100%);
}

body {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding:
    max(0.35rem, env(safe-area-inset-top, 0px))
    max(0.5rem, env(safe-area-inset-right, 0px))
    max(0.35rem, env(safe-area-inset-bottom, 0px))
    max(0.5rem, env(safe-area-inset-left, 0px));
}

main.studio-main {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

button,
input,
select {
  font-family: inherit;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(0.4rem, 1vh, 1rem);
  padding: clamp(0.45rem, 1.4vh, 1.5rem) clamp(0.75rem, 2vw, 1.5rem) clamp(0.35rem, 1vh, 1rem);
  flex-shrink: 0;
}

.brand-mark {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.8vh + 0.4vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1;
}

.brand-sub {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: clamp(0.7rem, 1.4vh, 0.85rem);
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(0.35rem, 0.8vh, 0.55rem);
}

.btn {
  appearance: none;
  border: none;
  border-radius: 8px;
  padding: clamp(0.35rem, 0.9vh, 0.55rem) clamp(0.65rem, 1.2vw, 1rem);
  font-weight: 600;
  font-size: clamp(0.75rem, 1.5vh, 0.9rem);
  cursor: pointer;
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-deep) 100%);
  color: #fff;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
}

.btn.danger {
  background: linear-gradient(135deg, #c45a5a 0%, #8e2f2f 100%);
}

.threshold-wrap {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: clamp(0.7rem, 1.3vh, 0.8rem);
}

.threshold-wrap input[type="range"] {
  width: 120px;
  accent-color: var(--teal);
}

.demo-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.2rem 0.35rem 0.2rem 0.55rem;
  border: 1px solid rgba(106, 143, 191, 0.45);
  border-radius: 8px;
  background: rgba(106, 143, 191, 0.12);
  flex-shrink: 0;
}

.demo-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: clamp(0.75rem, 1.4vh, 0.88rem);
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.demo-toggle input {
  accent-color: var(--teal);
  width: 1rem;
  height: 1rem;
}

.demo-toggle:has(input:checked) {
  color: #9fe0cb;
}

.demo-stepper {
  display: inline-flex;
  align-items: center;
  gap: 0.15rem;
}

.demo-step {
  appearance: none;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(61, 155, 132, 0.18);
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.demo-step:hover {
  border-color: var(--teal);
}

.demo-step:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.demo-count {
  min-width: 1.5rem;
  text-align: center;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(0.85rem, 1.6vh, 1rem);
}

.nav-links {
  display: flex;
  gap: 0.4rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.nav-links a:hover {
  color: var(--ink);
  border-color: var(--teal);
}

#boardGrid {
  --grid-gap: clamp(0.55rem, 1.3vh, 1.1rem);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--grid-gap);
  padding: 0 clamp(0.75rem, 2vw, 1.5rem) clamp(0.35rem, 1vh, 0.75rem);
  flex: 1 1 auto;
  min-height: 0;
  align-content: stretch;
  overflow: hidden;
  overscroll-behavior: contain;
}

/* Default: reserve 6 wall slots (2×3). One pack only fills one slot. */
#boardGrid.layout-6 {
  grid-template-rows: repeat(2, minmax(0, 1fr));
  grid-auto-rows: minmax(0, 1fr);
  overflow: hidden;
}

/* 7–9 packs: grow to 3×3 within the viewport. */
#boardGrid.layout-9 {
  grid-template-rows: repeat(3, minmax(0, 1fr));
  grid-auto-rows: minmax(0, 1fr);
  overflow: hidden;
}

/* 10+: keep 3-wide rows at ~1/3 viewport height and scroll. */
#boardGrid.layout-scroll {
  grid-template-rows: none;
  grid-auto-rows: calc((100% - (2 * var(--grid-gap))) / 3);
  overflow-y: auto;
  overflow-x: hidden;
  scroll-snap-type: y proximity;
}

#boardGrid.layout-scroll .board-card {
  scroll-snap-align: start;
}

.scroll-more-hint {
  position: absolute;
  left: 50%;
  bottom: max(0.65rem, env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 5;
  pointer-events: none;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(61, 155, 132, 0.4);
  background: rgba(8, 22, 18, 0.88);
  color: #b7e6d6;
  font-size: clamp(0.8rem, 1.5vh, 0.95rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  animation: scrollHintBob 1.8s ease-in-out infinite;
}

.scroll-more-hint[hidden] {
  display: none !important;
}

@keyframes scrollHintBob {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
    opacity: 0.85;
  }
  50% {
    transform: translateX(-50%) translateY(-4px);
    opacity: 1;
  }
}

.empty-state {
  margin: clamp(0.75rem, 2vh, 2rem) clamp(0.75rem, 2vw, 1.5rem);
  padding: clamp(1rem, 2vh, 2rem);
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 12px;
}

.board-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: clamp(0.55rem, 1.4vh, 1.15rem);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, outline 0.2s, background 0.25s;
  min-width: 0;
  min-height: 0;
  height: 100%;
  max-height: 100%;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.board-card.has-accent {
  --board-accent: #26a69a;
  background: color-mix(in srgb, var(--board-accent) 10%, #080c0b);
  border-color: color-mix(in srgb, var(--board-accent) 38%, rgba(230, 238, 235, 0.06));
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.45),
    inset 0 0 0 1px color-mix(in srgb, var(--board-accent) 16%, transparent);
}

.board-card.has-accent:hover {
  border-color: color-mix(in srgb, var(--board-accent) 58%, var(--teal));
  box-shadow:
    0 14px 36px rgba(0, 0, 0, 0.55),
    inset 0 0 0 1px color-mix(in srgb, var(--board-accent) 22%, transparent);
}

.board-card.expanded {
  height: auto;
  max-height: min(92dvh, 100%);
  overflow: auto;
  z-index: 2;
}

.board-card:hover {
  transform: translateY(-3px);
  border-color: var(--teal);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.55);
}

.board-card.dragging {
  opacity: 0.55;
  cursor: grabbing;
}

.board-card.drag-over {
  outline: 2px dashed var(--teal);
}

.board-card.priority {
  outline: 2px solid rgba(0, 200, 150, 0.55);
}

.board-card.offline {
  opacity: 0.72;
}

.board-card.data-stale {
  opacity: 0.82;
  filter: grayscale(0.35);
}

.board-card.data-offline {
  opacity: 0.62;
  filter: grayscale(0.75);
  border-color: #555;
}

.board-card.is-demo {
  border-style: dashed;
}

.health-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
  margin-bottom: clamp(0.35rem, 1vh, 0.7rem);
  padding: clamp(0.35rem, 0.9vh, 0.55rem) clamp(0.45rem, 1vw, 0.65rem);
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  flex-shrink: 0;
}

.health-pill {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(0.78rem, 1.7vh, 0.95rem);
  letter-spacing: 0.04em;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  color: #04110d;
  background: #6b7c76;
}

.health-mode {
  font-weight: 700;
  font-size: clamp(0.92rem, 1.9vh, 1.1rem);
}

.health-detail {
  color: var(--muted);
  font-size: clamp(0.78rem, 1.5vh, 0.92rem);
  margin-left: auto;
}

.health-demo-tag {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(0.62rem, 1.25vh, 0.72rem);
  letter-spacing: 0.06em;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  color: #d7e6f5;
  background: rgba(106, 143, 191, 0.35);
  border: 1px solid rgba(106, 143, 191, 0.45);
}

.health-demo-tag[hidden] {
  display: none !important;
}

.health-ok {
  border-color: rgba(76, 175, 80, 0.35);
  background: rgba(76, 175, 80, 0.1);
}
.health-ok .health-pill {
  background: #4caf50;
}
.health-ok .health-mode {
  color: #9ccc65;
}

.health-warn {
  border-color: rgba(196, 163, 90, 0.55);
  background: linear-gradient(
    105deg,
    rgba(196, 163, 90, 0.2),
    rgba(196, 163, 90, 0.08)
  );
  box-shadow: inset 0 0 0 1px rgba(196, 163, 90, 0.12);
}
.health-warn .health-pill {
  background: #c4a35a;
  color: #1a1408;
}
.health-warn .health-mode,
.health-warn .health-detail {
  color: #e0c988;
}

.health-fault {
  border-color: rgba(196, 90, 90, 0.65);
  background: linear-gradient(
    105deg,
    rgba(196, 90, 90, 0.24),
    rgba(196, 90, 90, 0.08)
  );
  animation: healthAlertPulse 2.4s ease-in-out infinite;
}
.health-fault .health-pill {
  background: #c45a5a;
  color: #fff;
}
.health-fault .health-mode,
.health-fault .health-detail {
  color: #ef9a9a;
}

@keyframes healthAlertPulse {
  0%,
  100% {
    box-shadow: inset 0 0 0 1px rgba(196, 90, 90, 0.15);
  }
  50% {
    box-shadow:
      inset 0 0 0 1px rgba(220, 100, 100, 0.35),
      0 0 18px rgba(180, 50, 50, 0.22);
  }
}

.health-demo {
  border-color: rgba(106, 143, 191, 0.4);
  background: rgba(106, 143, 191, 0.12);
}
.health-demo .health-pill {
  background: #4caf50;
}
.health-demo .health-mode {
  color: #a8c0df;
}

.board-card.health-tone-warn {
  border-color: rgba(196, 163, 90, 0.45);
}

.board-card.health-tone-fault {
  border-color: rgba(196, 90, 90, 0.55);
}

.cell-extremes.delta-warn {
  color: #e0c988;
}

.cell-extremes.delta-alert {
  color: #ef9a9a;
  font-weight: 700;
}

.tone-ok {
  color: #4caf50 !important;
}
.tone-warn {
  color: #c4a35a !important;
}
.tone-bad {
  color: #c45a5a !important;
}
.tone-muted {
  color: #8a9a94 !important;
}
.tone-charge {
  color: #4aad7f !important;
  font-weight: 700;
}
.tone-discharge {
  color: #6a8fbf !important;
  font-weight: 700;
}

.stats-grid-pack {
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(0.25rem, 0.7vh, 0.45rem);
  flex-shrink: 0;
}

.pack-glance {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 0.4rem;
  margin: 0 0 clamp(0.35rem, 0.9vh, 0.55rem);
  font-size: clamp(0.9rem, 1.9vh, 1.12rem);
  font-weight: 600;
  line-height: 1.25;
  flex-shrink: 0;
}

.pack-glance .sep {
  opacity: 0.4;
  font-weight: 500;
}

.board-card.expanded .pack-glance {
  display: none;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: clamp(0.35rem, 1vh, 0.75rem);
  flex-shrink: 0;
}

.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.6vh, 1.65rem);
  line-height: 1.15;
  cursor: pointer;
  margin: 0;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.18em;
  transition: text-decoration-color 0.15s;
}

.card-title:hover {
  filter: brightness(1.15);
  text-decoration-color: currentColor;
}

.card-meta {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.edit-toggle {
  appearance: none;
  border: 1px solid rgba(61, 155, 132, 0.45);
  background: rgba(61, 155, 132, 0.15);
  color: #9fe0cb;
  border-radius: 6px;
  min-width: 2rem;
  min-height: 2rem;
  font-size: 0.95rem;
  cursor: pointer;
  line-height: 1;
}

.edit-toggle:hover {
  background: rgba(61, 155, 132, 0.28);
}

.live-toggle {
  background: linear-gradient(135deg, #607d8b 0%, #455a64 100%);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.expand-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  border-radius: 6px;
  min-width: 2rem;
  min-height: 2rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.expand-toggle:focus {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.board-card .card-title,
.board-card button {
  cursor: pointer;
}

.board-card:not(.expanded) .detail-only {
  display: none !important;
}

.board-card:not(.expanded) .cell-number,
.board-card:not(.expanded) .cell-voltage {
  display: none;
}

.board-card:not(.expanded) .cell {
  padding: 0;
  min-height: 0;
  aspect-ratio: 1;
  border-width: 1px;
  border-radius: 2px;
}

.board-card:not(.expanded) .cell-rail {
  flex: 0 0 auto;
}

.board-card:not(.expanded) .cell-grid {
  grid-template-columns: repeat(42, minmax(0, 1fr));
  gap: 1px;
  flex: 0 0 auto;
  overflow: visible;
}

.board-card:not(.expanded) .cell-axis {
  gap: 1px;
}

.board-card:not(.expanded) .health-detail:empty {
  display: none;
}

.cell-extremes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.45rem;
  margin-top: clamp(0.25rem, 0.7vh, 0.45rem);
  color: var(--muted);
  font-size: clamp(0.8rem, 1.55vh, 0.95rem);
  flex-shrink: 0;
}

.cell-extremes .sep {
  opacity: 0.45;
}

.board-card.expanded .cell-extremes {
  display: none;
}

.board-card.expanded {
  cursor: default;
}

.detail-block {
  flex-shrink: 0;
}

.live-toggle.on {
  background: linear-gradient(135deg, #00c853 0%, #64dd17 100%);
  color: #04110d;
}

.fresh-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: clamp(0.68rem, 1.3vh, 0.78rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.22rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
  max-width: 9.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fresh-live {
  background: rgba(76, 175, 80, 0.28);
  color: #81c784;
}

.fresh-stale {
  background: rgba(196, 163, 90, 0.28);
  color: #e0c988;
}

.fresh-offline {
  background: rgba(120, 120, 120, 0.35);
  color: #b0b0b0;
}

.fresh-unknown {
  background: rgba(120, 120, 120, 0.25);
  color: #aaa;
}

.signal-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
}

.signal-excellent {
  background: rgba(76, 175, 80, 0.28);
  color: #4caf50;
}
.signal-good {
  background: rgba(139, 195, 74, 0.28);
  color: #8bc34a;
}
.signal-fair {
  background: rgba(255, 152, 0, 0.28);
  color: #ff9800;
}
.signal-weak {
  background: rgba(244, 67, 54, 0.28);
  color: #f44336;
}
.signal-unknown {
  background: rgba(120, 120, 120, 0.25);
  color: #aaa;
}

.soc-track {
  position: relative;
  height: clamp(32px, 5vh, 48px);
  border-radius: 12px;
  background: #2a2a2a;
  border: 2px solid #3a3a3a;
  /* Keep fill clipped via .soc-fill; leave track visible so charging glow can bloom. */
  overflow: visible;
  margin-bottom: clamp(0.35rem, 1vh, 0.9rem);
  flex-shrink: 0;
}

.soc-fill {
  height: 100%;
  border-radius: 10px;
  transition: width 0.5s ease, background 0.5s ease;
  position: relative;
  overflow: hidden;
}

.soc-fill.charging-animation,
.soc-track.charging-animation {
  animation: chargingPulse 2s ease-in-out infinite;
}

.soc-track.charging-animation {
  border-color: rgba(var(--charging-glow-color), 0.55);
}

.soc-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: clamp(1.05rem, 2.4vh, 1.4rem);
  color: #fff;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
  z-index: 2;
  pointer-events: none;
}

.charging-dots {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.charging-dot {
  position: absolute;
  width: var(--charging-dot-size, 10px);
  height: var(--charging-dot-size, 10px);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    #fff 0%,
    rgba(var(--charging-dots-color), 1) 35%,
    rgba(var(--charging-dots-color), calc(0.55 * var(--charging-dots-opacity, 1))) 70%,
    transparent 100%
  );
  box-shadow:
    0 0 6px 2px rgba(var(--charging-dots-color), 0.85),
    0 0 14px 4px rgba(255, 255, 255, 0.35);
  animation: chargingDotMove linear infinite;
  pointer-events: none;
  will-change: left;
}

.soc-track.charging-animation::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 10px;
  pointer-events: none;
  z-index: 1;
  background: linear-gradient(
    105deg,
    transparent 0%,
    transparent 40%,
    rgba(255, 255, 255, 0.28) 50%,
    transparent 60%,
    transparent 100%
  );
  background-size: 220% 100%;
  animation: chargingShimmer 1.8s ease-in-out infinite;
  mix-blend-mode: soft-light;
}

@keyframes chargingShimmer {
  0% {
    background-position: 120% 0;
  }
  100% {
    background-position: -120% 0;
  }
}

@keyframes chargingPulse {
  0%,
  100% {
    box-shadow:
      0 0 var(--glow-size-1) var(--glow-width-1)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-1) * var(--charging-pulse-opacity, 1))),
      0 0 var(--glow-size-2) var(--glow-width-2)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-2) * var(--charging-pulse-opacity, 1))),
      inset 0 0 var(--glow-size-1)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-inset-1) * var(--charging-pulse-opacity, 1)));
  }
  50% {
    box-shadow:
      0 0 var(--glow-size-3) var(--glow-width-3)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-3) * var(--charging-pulse-opacity, 1))),
      0 0 var(--glow-size-4) var(--glow-width-4)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-4) * var(--charging-pulse-opacity, 1))),
      inset 0 0 var(--glow-size-3)
        rgba(var(--charging-glow-color), calc(var(--glow-opacity-inset-2) * var(--charging-pulse-opacity, 1)));
  }
}

@keyframes chargingDotMove {
  0% {
    left: -8px;
  }
  100% {
    left: 100%;
  }
}

@keyframes balancingBleed {
  0%,
  100% {
    box-shadow:
      0 0 0 1px rgba(200, 70, 70, 0.35),
      0 0 10px rgba(180, 40, 40, 0.25),
      inset 0 0 14px rgba(160, 30, 30, 0.18);
    border-color: rgba(210, 80, 80, 0.85) !important;
  }
  50% {
    box-shadow:
      0 0 0 1px rgba(230, 90, 90, 0.55),
      0 0 18px rgba(200, 50, 50, 0.45),
      inset 0 0 22px rgba(180, 35, 35, 0.32);
    border-color: rgba(240, 100, 100, 0.95) !important;
  }
}

@keyframes balancingHeatGlow {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 0.7;
  }
}

.section-label {
  font-size: clamp(0.65rem, 1.3vh, 0.8rem);
  font-weight: 700;
  color: var(--teal);
  margin: clamp(0.3rem, 0.8vh, 0.65rem) 0 clamp(0.25rem, 0.6vh, 0.45rem);
  flex-shrink: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(0.25rem, 0.7vh, 0.45rem);
  flex-shrink: 0;
}

.stat-box {
  background: #2a2a2a;
  padding: clamp(0.3rem, 0.8vh, 0.5rem) clamp(0.35rem, 0.8vw, 0.55rem);
  border-radius: 8px;
  border-left: 3px solid #26a69a;
  min-width: 0;
}

.stat-label {
  font-size: clamp(0.58rem, 1.15vh, 0.7rem);
  color: #b0b0b0;
  margin-bottom: 0.15rem;
}

.stat-value {
  font-size: clamp(0.72rem, 1.6vh, 0.9rem);
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
}

.stat-unit {
  font-size: clamp(0.55rem, 1.1vh, 0.65rem);
  color: #999;
  font-weight: 400;
}

.pack-glance .s-count {
  font-size: clamp(0.7rem, 1.4vh, 0.85rem);
}

.cell-rail {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
}

.cell-grid {
  position: relative;
  display: grid;
  /* Always one row of 42 slots — cell size stays constant regardless of pack S */
  grid-template-columns: repeat(42, minmax(0, 1fr));
  gap: clamp(1px, 0.25vh, 3px);
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  align-content: start;
  overflow: visible;
}

.cell-axis {
  display: grid;
  grid-template-columns: repeat(42, minmax(0, 1fr));
  gap: clamp(1px, 0.25vh, 3px);
  width: 100%;
  min-height: 0.85em;
  pointer-events: none;
}

.cell-axis-slot {
  min-width: 0;
  text-align: center;
  font-size: clamp(0.38rem, 0.85vh, 0.55rem);
  line-height: 1.1;
  color: #8a9590;
  font-variant-numeric: tabular-nums;
}

.cell-axis-slot.is-end {
  text-align: right;
}

.cell-axis-slot .s-count {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(0.45rem, 1vh, 0.65rem);
  color: #9fe0cb;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.cell {
  background: #2a2a2a;
  padding: clamp(0.08rem, 0.35vh, 0.22rem) 1px;
  border-radius: 3px;
  text-align: center;
  border: 1px solid #3a3a3a;
  transition: border-color 0.2s, background-color 0.2s;
  position: relative;
  min-width: 0;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.cell.unused {
  opacity: 0.22;
  border-color: #444;
  background: #1c1c1c;
  border-style: dashed;
}

.s-count {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(0.7rem, 1.6vh, 0.95rem);
  color: #9fe0cb;
  letter-spacing: 0.02em;
}

.cell-number {
  font-size: clamp(0.35rem, 0.7vh, 0.5rem);
  color: #aaa;
  position: relative;
  z-index: 2;
  line-height: 1.05;
}

.cell-voltage {
  font-size: clamp(0.38rem, 0.8vh, 0.55rem);
  font-weight: 700;
  margin-top: 0.02rem;
  position: relative;
  z-index: 2;
  line-height: 1.05;
}

.p-stepper {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.25rem;
}
.p-stepper .btn {
  min-width: 2.2rem;
  padding: 0.35rem 0.55rem;
  font-size: 1.1rem;
  line-height: 1;
}
.p-stepper-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  min-width: 1.5rem;
  text-align: center;
  color: var(--ink);
}

.cell.bleeding {
  animation: balancingBleed 2.4s ease-in-out infinite;
  z-index: 2;
}

.cell.bleeding::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  pointer-events: none;
  z-index: 1;
  background: radial-gradient(
    ellipse at 50% 40%,
    rgba(190, 45, 45, 0.45) 0%,
    rgba(140, 25, 25, 0.18) 55%,
    transparent 75%
  );
  animation: balancingHeatGlow 2.4s ease-in-out infinite;
}

.balancing-snake {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(var(--balancing-snake-color), 1) 0%,
    rgba(var(--balancing-snake-color), 0.7) 50%,
    transparent 100%
  );
  box-shadow:
    0 0 4px rgba(var(--balancing-snake-color), 0.9),
    0 0 8px rgba(var(--balancing-snake-color), 0.6);
  pointer-events: none;
  z-index: 10;
  left: 0;
  top: 0;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal,
.side-panel {
  position: fixed;
  z-index: 210;
  background: #151515;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
  color: var(--ink);
}

.modal {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.96);
  width: min(560px, calc(100vw - 2rem));
  max-height: min(86vh, 820px);
  overflow: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}

.modal.open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.side-panel {
  top: 0;
  right: 0;
  width: min(420px, 100vw);
  height: 100vh;
  border-radius: 0;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  display: flex;
  flex-direction: column;
}

.side-panel.open {
  transform: translateX(0);
}

.modal-head,
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
}

.modal-head h2,
.panel-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.modal-body,
.panel-body {
  padding: 1rem 1.1rem 1.25rem;
  overflow: auto;
}

.panel-body {
  flex: 1;
}

.settings-category {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 0.7rem;
  overflow: hidden;
}

.settings-category-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  font-weight: 700;
  background: #1c1c1c;
}

.settings-category-title .arrow {
  transition: transform 0.2s;
  color: var(--muted);
}

.settings-category.collapsed .arrow {
  transform: rotate(-90deg);
}

.settings-category-content {
  padding: 0.4rem 0.85rem 0.75rem;
}

.settings-category.collapsed .settings-category-content {
  display: none;
}

.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.settings-row:last-child {
  border-bottom: none;
}

.settings-label {
  font-weight: 600;
  font-size: 0.88rem;
}

.settings-description {
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 0.15rem;
  max-width: 240px;
}

.settings-row input[type="number"],
.settings-row input[type="text"],
.settings-row input[type="color"],
.modal-body input,
.modal-body select,
.panel-body input {
  background: #2a2a2a;
  color: var(--ink);
  border: 2px solid var(--teal);
  border-radius: 6px;
  padding: 0.4rem 0.55rem;
  font-weight: 600;
}

.settings-row input[type="number"] {
  width: 88px;
  text-align: right;
}

.color-picker-field {
  position: relative;
  display: inline-flex;
  align-items: stretch;
  width: 3.4rem;
  height: 2.5rem;
  border-radius: 8px;
  overflow: hidden;
  border: 2px solid color-mix(in srgb, var(--picker-color, var(--teal)) 55%, var(--line));
  background: var(--picker-color, #26a69a);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.35);
  cursor: pointer;
}
.color-picker-field input[type="color"] {
  position: absolute;
  inset: -6px;
  width: calc(100% + 12px);
  height: calc(100% + 12px);
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}
.modal-body .color-picker-field input[type="color"],
.settings-row .color-picker-field input[type="color"] {
  background: transparent;
  border: none;
  box-shadow: none;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.form-field label {
  font-size: 0.8rem;
  color: var(--muted);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}

.cell-type-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 0.75rem;
  background: #1a1a1a;
  overflow: hidden;
}

.cell-type-card.dragging {
  opacity: 0.5;
}

.cell-type-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  font-weight: 700;
}

.cell-type-body {
  padding: 0 0.85rem 0.9rem;
  display: none;
}

.cell-type-card.open .cell-type-body {
  display: block;
}

.curve-svg {
  width: 100%;
  height: 180px;
  background: #111;
  border-radius: 8px;
  border: 1px solid #333;
  touch-action: none;
}

.curve-point {
  cursor: grab;
  fill: #9c27b0;
  stroke: #fff;
  stroke-width: 1.5;
}

@media (max-width: 720px) {
  .topbar {
    padding: clamp(0.5rem, 1.2vh, 1rem);
  }

  #boardGrid,
  #boardGrid.layout-6,
  #boardGrid.layout-9,
  #boardGrid.layout-scroll {
    padding: 0 1rem clamp(0.35rem, 1vh, 0.75rem);
    grid-template-columns: 1fr;
    grid-template-rows: none;
    grid-auto-rows: auto;
    overflow-y: auto;
    align-content: start;
  }

  #boardGrid.layout-scroll {
    grid-auto-rows: auto;
  }

  .board-card {
    height: auto;
    max-height: none;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid-pack {
    grid-template-columns: repeat(2, 1fr);
  }

  .settings-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 721px) and (max-width: 1100px) {
  #boardGrid,
  #boardGrid.layout-6,
  #boardGrid.layout-9,
  #boardGrid.layout-scroll {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #boardGrid.layout-6 {
    grid-template-rows: repeat(3, minmax(0, 1fr));
  }

  #boardGrid.layout-9 {
    grid-template-rows: repeat(5, minmax(0, 1fr));
  }

  #boardGrid.layout-scroll {
    grid-auto-rows: calc((100% - (2 * var(--grid-gap))) / 3);
  }
}

/* Short displays (TV browser chrome, landscape tablets, laptops) */
@media (max-height: 820px) {
  .board-card:hover {
    transform: none;
  }

  .nav-links a {
    padding: 0.3rem 0.55rem;
  }
}

@media (max-height: 700px) {
  .threshold-wrap span:last-child {
    display: none;
  }

  .nav-links {
    display: none;
  }

  .card-meta {
    display: none;
  }

  .live-toggle {
    display: none;
  }
}

@media (max-height: 560px) {
  .brand-sub {
    display: none;
  }

  .section-label {
    margin: 0.2rem 0 0.15rem;
  }

  .section-label:has(+ [data-role="balanceStats"]),
  [data-role="balanceStats"] {
    display: none;
  }

  .health-detail {
    width: 100%;
    margin-left: 0;
  }
}