:root {
  --bg: #0f1419;
  --bg-elev: #171e26;
  --bg-panel: #1b2430;
  --border: #2a3644;
  --text: #e7eef7;
  --muted: #8b9bb0;
  --accent: #3db8a8;
  --accent-dim: #2a8f83;
  --warn: #e0a45a;
  --danger: #e06c75;
  --ok: #7dce82;
  --chip: #222c38;
  --selected: #2f5d56;
  --linked: #3a6b3f;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2836 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font);
}

button, input, select {
  font: inherit;
  color: inherit;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}

.brand-mark {
  width: 14px;
  height: 36px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), #1e6d8a);
}

.brand h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0.1rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.status-block {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.conn-pill {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-family: var(--mono);
  border: 1px solid var(--border);
}

.conn-pill.online {
  color: var(--ok);
  border-color: #3d6a42;
  background: #16301c;
}

.conn-pill.offline {
  color: var(--danger);
  border-color: #6a3a42;
  background: #30161c;
}

.conn-pill.busy {
  color: var(--warn);
  border-color: #6a5530;
  background: #2c2414;
}

.access-pill {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-family: var(--mono);
  border: 1px solid var(--border);
  color: var(--muted);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.access-pill.holder {
  color: var(--ok);
  border-color: #3d6a42;
}

.access-pill.waiting {
  color: var(--warn);
  border-color: #6a5530;
}

.access-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 12, 16, 0.72);
  backdrop-filter: blur(2px);
}

.access-overlay.hidden {
  display: none;
}

.access-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  max-width: 420px;
  text-align: center;
}

.access-card h2 {
  margin: 0 0 0.6rem;
  font-size: 1.2rem;
}

.access-wait-msg {
  margin: 0 0 0.75rem;
  font-family: var(--mono);
  font-size: 1rem;
}

.layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1rem;
  padding: 1rem;
  max-width: 1600px;
  margin: 0 auto;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.mode, .tab, .btn {
  border: 1px solid var(--border);
  background: var(--chip);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.mode:hover, .tab:hover, .btn:hover {
  border-color: #3e4f63;
  background: #273242;
}

.mode.active, .tab.active {
  background: var(--selected);
  border-color: var(--accent-dim);
  color: #dffaf5;
}

.btn.primary {
  background: linear-gradient(180deg, #3db8a8, #2a8f83);
  border-color: #2f9a8c;
  color: #061412;
  font-weight: 600;
}

.btn.primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.ghost {
  background: transparent;
}

.btn-row, .inline {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

.panel.hidden, .hidden { display: none !important; }

.panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.panel h3 {
  margin: 1rem 0 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.hint, .muted {
  color: var(--muted);
  font-size: 0.82rem;
}

.field {
  margin: 0.75rem 0;
}

.field label {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field input, .field select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
}

.inline input {
  width: auto;
  flex: 1;
  min-width: 100px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
}

.chip-value {
  font-family: var(--mono);
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  min-height: 2.4rem;
}

.conn-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 180px;
  overflow: auto;
}

.conn-list li {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--ok);
}

.result-box {
  margin-top: 0.8rem;
  padding: 0.65rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
}

.tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
}

.channel-grid label {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0.45rem;
  font-size: 0.8rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
  cursor: pointer;
}

.dropzone {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
  background: var(--bg);
  margin-bottom: 0.75rem;
}

.dropzone.drag {
  border-color: var(--accent);
  background: #13262a;
}

.file-name {
  margin: 0.6rem 0 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

.file-label {
  display: inline-block;
  margin-top: 0.4rem;
}

.workspace {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.board-card, .wave-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

.board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.board-header h2 {
  margin: 0;
  font-size: 1rem;
}

.board-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.board-row h3 {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.board-row-chip .ssop {
  max-width: 420px;
}

.net-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.net-row .net-btn {
  width: auto;
  min-width: 3.4rem;
  text-align: center;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
}

.net-btn .net-label {
  pointer-events: none;
}

.io-mark {
  display: none;
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  pointer-events: none;
}

.io-mark.square,
.io-mark.circle {
  display: inline-block;
}

.io-mark.square {
  border-radius: 1px;
}

.io-mark.circle {
  border-radius: 50%;
}

.io-mark.high {
  background: #e06c75;
}

.io-mark.low {
  background: #61afef;
}

.ssop {
  display: grid;
  grid-template-columns: 1fr 28px 1fr;
  gap: 0.25rem 0.4rem;
  background: #121820;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem;
}

.ssop-body {
  grid-column: 2;
  grid-row: 1 / span 10;
  background: linear-gradient(180deg, #2a3544, #1a222c);
  border-radius: 4px;
  border: 1px solid #3a4656;
  position: relative;
}

.ssop-body::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: #0d1117;
  border: 1px solid #4a5565;
}

.pin-btn, .net-btn {
  width: 100%;
  text-align: left;
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--chip);
  cursor: pointer;
}

.pin-btn.right { text-align: right; }

.pin-btn.selected, .net-btn.selected {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.pin-btn.linked, .net-btn.linked {
  /* border/tint set inline from network component color */
}

.pin-btn.power {
  cursor: not-allowed;
  opacity: 0.9;
  font-weight: 600;
}

.pin-btn.power:disabled {
  cursor: not-allowed;
  opacity: 0.9;
}

.pin-btn.power-vss {
  background: #1a2433;
  border-color: #5b7a9e;
  color: #a8c0d8;
}

.pin-btn.power-vdd {
  background: #2a1e14;
  border-color: #c4894a;
  color: #e8c49a;
}

.pin-btn.power-vss.selected,
.pin-btn.power-vdd.selected {
  outline-color: var(--accent);
}


.wave-tools {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

#wave-canvas {
  width: 100%;
  height: 420px;
  display: block;
  background: #0c1015;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: crosshair;
}

.wave-empty {
  margin-top: 0.6rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.wave-empty.hidden { display: none; }

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  max-width: 360px;
  padding: 0.8rem 1rem;
  background: #243041;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  z-index: 50;
}

.toast.error {
  border-color: #6a3a42;
  background: #2a171c;
}

.toast.ok {
  border-color: #3d6a42;
  background: #16231a;
}

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
}