.serial-tester-page {
  margin: 0;
  min-height: 100%;
  height: auto;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.55;
  background: #e8ecf1;
  background-image:
    radial-gradient(ellipse 100% 60% at 50% -10%, rgba(0, 154, 70, 0.08), transparent),
    radial-gradient(ellipse 55% 40% at 100% 0%, rgba(48, 107, 151, 0.06), transparent);
  color: #1a2332;
}

.serial-tester-page .serial-main {
  flex: 1;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.serial-scope {
  --bg: #f4f6f9;
  --surface: #fff;
  --border: rgba(0, 0, 0, 0.1);
  --text: #1a2332;
  --muted: #5a6b7d;
  --accent: #009a46;
  --accent-hover: #007a38;
  --accent-muted: rgba(0, 154, 70, 0.14);
  --accent-blue: #306b97;
  --warn-bg: #fff8eb;
  --warn-border: #e8c878;
  --error: #c62828;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 10px 36px rgba(22, 28, 38, 0.08);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.serial-tester-page .serial-scope.serial-app {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* Hero — use div.serial-hero, not <header>, to avoid global site header styles */
.serial-tester-page .serial-scope .serial-hero {
  padding: 1.5rem 1.35rem 1.25rem;
  background: linear-gradient(165deg, #dcefe4 0%, #eef6f1 45%, #e8eef5 100%);
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.serial-tester-page .serial-scope .serial-hero-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.serial-tester-page .serial-scope .serial-hero-text {
  flex: 1 1 16rem;
  min-width: 0;
}


.serial-tester-page .serial-scope .serial-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

.serial-tester-page .serial-scope .serial-hero h2 {
  margin: 0 0 0.3rem;
  font-size: clamp(1.35rem, 3.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.serial-tester-page .serial-scope .serial-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 34rem;
}

.serial-tester-page .serial-scope .serial-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.serial-tester-page .serial-scope .pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
}

.serial-tester-page .serial-scope .pill--ok {
  border-color: rgba(0, 154, 70, 0.35);
  background: #f0faf4;
  color: #1a5c36;
}

.serial-tester-page .serial-scope .pill--bad {
  border-color: rgba(198, 40, 40, 0.35);
  background: #fef5f5;
  color: var(--error);
}

.serial-tester-page .serial-scope .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #94a3b8;
  flex-shrink: 0;
}

.serial-tester-page .serial-scope .dot.connected { background: var(--accent); }
.serial-tester-page .serial-scope .dot.error { background: var(--error); }

/* Workspace — single column (port settings live in modal) */
.serial-tester-page .serial-scope .serial-workspace {
  display: block;
}

.serial-tester-page .serial-scope .serial-connection-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.serial-tester-page .serial-scope .connection-config {
  font-size: 0.82rem;
  color: var(--muted);
}

.serial-tester-page .serial-scope .connection-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.serial-tester-page .serial-scope .connection-actions button {
  width: auto;
}

.serial-tester-page .serial-scope .serial-panel {
  padding: 1.15rem 1.25rem;
  min-width: 0;
}

.serial-tester-page .serial-scope .serial-panel + .serial-panel {
  border-top: 1px solid var(--border);
}

.serial-tester-page .serial-scope .panel-title {
  margin: 0 0 0.85rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
}

/* Form */
.serial-tester-page .serial-scope .field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem 0.75rem;
}

.serial-tester-page .serial-scope .field--full {
  grid-column: 1 / -1;
}

.serial-tester-page .serial-scope .mono {
  font-family: var(--mono);
}

.serial-tester-page .serial-scope .field {
  min-width: 0;
}

.serial-tester-page .serial-scope .field label {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.serial-tester-page .serial-scope input,
.serial-tester-page .serial-scope select,
.serial-tester-page .serial-scope textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.65rem;
  outline: none;
}

.serial-tester-page .serial-scope input:focus,
.serial-tester-page .serial-scope select:focus,
.serial-tester-page .serial-scope textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.serial-tester-page .serial-scope input:disabled,
.serial-tester-page .serial-scope select:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  background: #eef1f5;
}

.serial-tester-page .serial-scope .baud-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.serial-tester-page .serial-scope .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.serial-tester-page .serial-scope button {
  font: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

.serial-tester-page .serial-scope button:active:not(:disabled) {
  transform: scale(0.98);
}

.serial-tester-page .serial-scope button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.serial-tester-page .serial-scope .btn-primary {
  background: var(--accent);
  color: #fff;
  flex: 1 1 auto;
}

.serial-tester-page .serial-scope .btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.serial-tester-page .serial-scope .btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.serial-tester-page .serial-scope .btn-secondary:hover:not(:disabled) {
  background: var(--accent-muted);
}

.serial-tester-page .serial-scope .btn-accent {
  background: var(--accent-blue);
  color: #fff;
}

.serial-tester-page .serial-scope .btn-accent:hover:not(:disabled) {
  filter: brightness(1.05);
}

.serial-tester-page .serial-scope .btn-ghost {
  background: transparent;
  color: var(--accent-blue);
  border: 1px solid transparent;
  padding: 0.4rem 0.55rem;
  font-size: 0.82rem;
  font-weight: 500;
}

.serial-tester-page .serial-scope .btn-ghost:hover:not(:disabled) {
  background: rgba(48, 107, 151, 0.08);
}

/* Modal */
.serial-tester-page .serial-scope .serial-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(22, 28, 38, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.serial-tester-page .serial-scope .serial-modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.serial-tester-page .serial-scope .serial-modal {
  width: min(100%, 28rem);
  max-height: min(90vh, 40rem);
  overflow: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(22, 28, 38, 0.2);
}

.serial-tester-page .serial-scope .serial-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.15rem 0.85rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.serial-tester-page .serial-scope .serial-modal-header h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.serial-tester-page .serial-scope .serial-modal-header p {
  margin: 0.2rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.serial-tester-page .serial-scope .serial-modal-close {
  width: auto;
  padding: 0.35rem 0.55rem;
  font-size: 1.25rem;
  line-height: 1;
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 6px;
}

.serial-tester-page .serial-scope .serial-modal-close:hover {
  background: var(--accent-muted);
  color: var(--text);
}

.serial-tester-page .serial-scope .serial-modal-body {
  padding: 1rem 1.15rem;
}

.serial-tester-page .serial-scope .serial-modal-section {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.serial-tester-page .serial-scope .serial-modal-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.serial-tester-page .serial-scope .serial-modal-section-title {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.serial-tester-page .serial-scope .serial-modal-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.85rem 1.15rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.serial-tester-page .serial-scope .serial-modal-footer .btn-primary,
.serial-tester-page .serial-scope .serial-modal-footer .btn-secondary {
  flex: 1 1 auto;
}

.serial-tester-page .serial-scope .serial-modal-footer .btn-close-modal {
  flex: 0 0 auto;
}

.serial-tester-page .serial-scope .signals-readout {
  margin: 0.65rem 0 0;
  padding: 0.45rem 0.55rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 6px;
  word-break: break-word;
}

.serial-tester-page .serial-scope .modal-note {
  margin: 0.85rem 0 0;
  font-size: 0.78rem;
  line-height: 1.45;
  color: var(--muted);
}

/* TX area */
.serial-tester-page .serial-scope .tx-area textarea {
  min-height: 5.5rem;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.45;
}

.serial-tester-page .serial-scope .tx-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: 0.65rem;
}

.serial-tester-page .serial-scope .tx-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.serial-tester-page .serial-scope .tx-actions .btn-accent {
  min-width: 5.5rem;
}

.serial-tester-page .serial-scope .tx-hint {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--muted);
}

.serial-tester-page .serial-scope .check {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.serial-tester-page .serial-scope .check input {
  width: auto;
  accent-color: var(--accent);
}

/* Log */
.serial-tester-page .serial-scope .log-panel {
  display: flex;
  flex-direction: column;
  min-height: 22rem;
}

@media (min-width: 960px) {
  .serial-tester-page .serial-scope .log-panel {
    min-height: calc(100vh - 16rem);
  }
}

.serial-tester-page .serial-scope .log-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
  margin-bottom: 0.65rem;
}

.serial-tester-page .serial-scope .log-toolbar .spacer {
  flex: 1 1 auto;
}

.serial-tester-page .serial-scope .log-stats {
  font-size: 0.75rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.serial-tester-page .serial-scope .log-view {
  flex: 1;
  min-height: 14rem;
  margin: 0;
  padding: 0.75rem;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: #1e3a2f;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  white-space: pre-wrap;
  word-break: break-word;
}

.serial-tester-page .serial-scope .log-line--rx { color: #1a5c36; }
.serial-tester-page .serial-scope .log-line--tx { color: #1e4a6e; }
.serial-tester-page .serial-scope .log-line--info { color: var(--muted); }
.serial-tester-page .serial-scope .log-line--warn { color: #9a6700; }
.serial-tester-page .serial-scope .log-line--error { color: var(--error); }

@media (max-width: 640px) {
  .serial-tester-page .serial-scope .field-grid,
  .serial-tester-page .serial-scope .tx-options,
  .serial-tester-page .serial-scope .baud-row {
    grid-template-columns: 1fr;
  }

  .serial-tester-page .serial-scope .tx-hint {
    width: 100%;
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .serial-tester-page .serial-scope button {
    transition: none;
  }
}

.shell-main.serial-tester-page-shell {
  margin: 0;
  padding: 0;
  border: none;
  box-shadow: none;
  border-radius: 0;
  background: transparent;
}

body[data-shell-active] .shell-main.serial-tester-page-shell {
  padding: 0;
}

.shell-main.serial-tester-page-shell .tool-page-header,
.shell-main.serial-tester-page-shell .tool-lead {
  display: none;
}