/* ── Serial monitor tool ── */

.serial-tool {
  max-width: 780px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.serial-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.serial-toolbar-secondary {
  justify-content: space-between;
}

.serial-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.serial-field select,
.line-ending-select {
  background: var(--bg-card);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  font-size: 0.9rem;
}

.serial-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-left: auto;
}

.serial-status-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--muted);
  flex-shrink: 0;
}

.serial-status-dot.connected {
  background: var(--green);
  box-shadow: 0 0 8px var(--green-dim);
}

.serial-status-dot.error {
  background: #e0453d;
}

.terminal-output {
  background: #0b0b0b;
  color: #d6f5d6;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  height: 420px;
  overflow-y: auto;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: var(--shadow-sm);
}

.terminal-line-error {
  color: #ff8a80;
}

.terminal-line-system {
  color: #8ab4ff;
}

.serial-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.tool-btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.tool-btn-secondary:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.tool-btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.tool-btn-secondary:disabled:hover {
  border-color: var(--border);
  color: var(--muted);
}

.serial-quick-commands {
  display: flex;
  gap: 0.75rem;
}

.serial-connect-btn,
.serial-send-btn {
  width: auto;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.serial-connect-btn.connected {
  background: #e0453d;
  box-shadow: 0 2px 8px rgba(224, 69, 61, 0.3);
}

.serial-send-row {
  display: flex;
  gap: 0.75rem;
}

.serial-send-row input[type="text"] {
  flex: 1;
  min-width: 0;
  background: var(--bg-card);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  font-size: 0.95rem;
}

.serial-send-row input[type="text"]:disabled,
.serial-field select:disabled,
.line-ending-select:disabled,
.serial-send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.serial-notes {
  margin-top: 2.5rem;
}

/* ── Calculator tools ── */

.calc-tool {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.calc-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1.1rem;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.calc-field label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--muted);
}

.calc-input-row {
  display: flex;
  gap: 0.5rem;
}

.calc-input-row input,
.calc-input-row select,
.calc-field > select {
  background: var(--bg);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  width: 100%;
  font-family: inherit;
}

.calc-input-row input {
  flex: 1;
  min-width: 0;
}

.calc-input-row select {
  flex: 0 0 auto;
  width: auto;
}

.calc-submit-btn {
  width: auto;
  align-self: flex-start;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.calc-button-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.calc-results {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.calc-result-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-left: 4px solid var(--orange);
  border-radius: 12px;
  padding: 0.9rem 1.25rem;
}

.calc-result-label {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
}

.calc-result-value {
  font-size: 1.25rem;
  font-weight: 800;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  text-align: right;
}

.calc-error {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-left: 4px solid #e0453d;
  border-radius: 12px;
  padding: 0.9rem 1.25rem;
  color: #e0453d;
  font-size: 0.9rem;
  font-weight: 600;
}

.calc-hint {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Resistor color code visual ── */

.resistor-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 1.5rem 0 2rem;
}

.resistor-lead {
  width: 13rem;
  max-width: 18vw;
  height: 4px;
  background: #9a9a9a;
}

.resistor-body {
  display: flex;
  align-items: stretch;
  justify-content: space-evenly;
  width: 15rem;
  height: 3.6rem;
  background: linear-gradient(180deg, #e3c891 0%, #d3ad6e 55%, #c39c5c 100%);
  border-radius: 18px;
  padding: 0.4rem 1.1rem;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.resistor-band {
  width: 0.95rem;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.15);
}

.resistor-band-empty {
  background: transparent;
  box-shadow: none;
}

/* ── Capacitor reference table ── */

.calc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.calc-table th,
.calc-table td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border);
}

.calc-table th {
  color: var(--muted);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}