:root {
  --primary-color: #2563eb;
  --primary-hover: #1e40af;
  --success-color: #16a34a;
  --success-hover: #15803d;
  --danger-color: #dc2626;
  --border-color: #e5e7eb;
  --bg-color: #f3f4f6;
  --text-color: #111827;
  --panel-bg: #fff;
  --secondary-bg: #f9fafb;
  --muted-bg: #f0f0f0;
  --info-bg: #e0e7ff;
  --info-text: #1e3a8a;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 30px;
  background: var(--bg-color);
  color: var(--text-color);
}

textarea, input, select {
  font-family: inherit;
  font-size: 14px;
}

label {
  display: inline-block;
  margin-bottom: 5px;
}

.field {
  margin-bottom: 12px;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toggle-group {
  display: flex;
  gap: 10px;
  font-size: 14px;
}

.toggle-group input {
  margin-right: 4px;
}

pre {
  background: var(--bg-color);
  padding: 10px;
  white-space: pre-wrap;
  width: 100%;
}

#mainContainer {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

#leftPanel,
#rightPanel,
.panel-box {
  flex: 1;
  padding: 20px;
  max-width: 50%;
  min-width: 300px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

h2 {
  margin-top: 0;
  font-size: 18px;
}

h3 {
  font-size: 16px;
  margin: 10px 0;
}

#logContainer {
  margin-top: 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#log {
  width: 100%;
  font-family: "Fira Code", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.4;
}

#blockContent {
  font-family: "Fira Code", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.4;
}

#clearLogBtn {
  width: 100%;
  height: 60px;
}

#passwordContainer {
  margin-bottom: 20px;
  padding: 20px;
  border: 1px solid var(--border-color);
  background: #fff;
}

h1 {
  margin: 10px 0;
}

.tab-button {
  background: var(--muted-bg);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  cursor: pointer;
  margin-right: 4px;
  color: var(--text-color);
  border-radius: 4px;
  transition: background 0.2s;
}
.tab-button:hover {
  background: var(--primary-hover);
  color: #fff;
  border-color: var(--primary-hover);
}

.tab-button.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #fff;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

textarea {
  width: 100%;
  border: 1px solid var(--border-color);
  padding: 6px;
}

.key-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.key-row #loadKeyBtn {
  margin-left: auto;
}

#registerBtn {
  background: var(--success-color);
}

#registerBtn:hover {
  background: var(--success-hover);
}

.connection-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.connection-controls input {
  flex: 1;
}

#status {
  margin-left: auto;
}

.status {
  padding: 8px;
  font-size: 12px;
  border-radius: 4px;
}

.status.connected {
  background: var(--success-color);
  color: #fff;
}

.status.disconnected {
  background: var(--danger-color);
  color: #fff;
}

input[type="text"],
input[type="password"],
select {
  width: 100%;
  padding: 6px;
  border: 1px solid var(--border-color);
  background: #fff;
  box-sizing: border-box;
  border-radius: 4px;
}

button {
  background: var(--primary-color);
  color: #fff;
  border: none;
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.2s;
}

button:hover {
  background: var(--primary-hover);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 10px;
  margin-bottom: 10px;
}

.checkbox-grid strong {
  grid-column: span 3;
}

#bottomPanelContainer {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

#loadKeyInput {
  display: none;
}

.no-top-margin {
  margin-top: 0;
}

.divider {
  margin: 15px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th,
table td {
  padding: 4px 8px;
  border: 1px solid var(--border-color);
  font-size: 14px;
}

#schemeSplit {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

#schemeContainer,
#schemeInfo {
  flex: 1;
  max-width: 50%;
  min-width: 300px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

#schemeContainer {
  position: relative;
  height: 500px;
  overflow: auto;
  padding: 20px;
}

#schemeInfo {
  padding: 20px;
}

.block-info-row {
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
}

.block-info-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 14px;
}

.block-info-item .info-label {
  font-weight: 600;
}

.block-info-item .info-value {
  background: var(--info-bg);
  color: var(--info-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Fira Code", "Courier New", monospace;
}

.block-info-row .primary-btn {
  margin-left: auto;
  background: var(--primary-color);
  color: #fff;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s;
}

.block-info-row .primary-btn:hover {
  background: var(--primary-hover);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.action-row select {
  flex: 1;
}

.action-row button {
  margin-left: auto;
}

.block-node {
  position: absolute;
  padding: 6px 10px;
  background: var(--info-bg);
  color: var(--info-text);
  border: 1px solid var(--primary-color);
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  white-space: pre-line;
  font-size: 12px;
}

.block-node.selected {
  background: var(--success-color);
  color: #fff;
  border-color: var(--success-color);
}

#appendStatus {
  margin-top: 8px;
  color: var(--success-color);
}

.svg-edges {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.tab-content {
        margin: 10px 0px;
}

.tabs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.theme-switch {
  margin-left: auto;
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.theme-switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--border-color);
  transition: 0.4s;
  border-radius: 20px;
}

.theme-switch .slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 2px;
  bottom: 2px;
  background: #fff;
  transition: 0.4s;
  border-radius: 50%;
}

.theme-switch input:checked + .slider {
  background: var(--primary-color);
}

.theme-switch input:checked + .slider:before {
  transform: translateX(20px);
}

#logInfo {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  font-size: 14px;
  align-items: center;
}

.highlight {
  color: var(--primary-color);
  font-weight: bold;
}

a.highlight {
  color: var(--primary-color);
  font-weight: bold;
  text-decoration: none;
  transition: opacity 0.2s;
}

a.highlight:hover {
  opacity: 0.8;
  text-decoration: underline;
}

body.dark-theme {
  --bg-color: #1f2937;
  --text-color: #f3f4f6;
  --border-color: #374151;
  --panel-bg: #111827;
  --secondary-bg: #1f2937;
  --muted-bg: #374151;
  --info-bg: #374151;
  --info-text: #f3f4f6;
}

@media (max-width: 600px) {
  body { padding: 15px; }
  #leftPanel, #rightPanel, .panel-box, #schemeContainer, #schemeInfo { max-width: 100%; }
  .tabs { flex-wrap: wrap; }
  .theme-switch { margin-left: 0; }
}