:root {
  --bg-main: #101318;
  --bg-card: #181c24;
  --bg-card-header: #1f242e;
  --bg-input: #0d1015;
  --border-color: #2a303c;
  --border-focus: #388bfd;
  
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --text-highlight: #ffffff;
  
  --accent-blue: #1f6feb;
  --accent-blue-hover: #388bfd;
  --accent-blue-light: #58a6ff;
  --accent-danger: #cf222e;
  --accent-success: #2da44e;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Clean White Topbar Header */
.topbar {
  background-color: #ffffff;
  border-bottom: 1px solid #d0d7de;
  padding: 8px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  height: 42px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Topbar specific buttons */
.topbar .btn-secondary {
  background-color: #f6f8fa;
  color: #24292f;
  border: 1px solid #d0d7de;
}

.topbar .btn-secondary:hover:not(:disabled) {
  background-color: #f3f4f6;
  border-color: #1f2328;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  user-select: none;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #ffffff;
  border: 1px solid #1158c7;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-blue-hover);
  border-color: #388bfd;
}

.btn-secondary {
  background-color: #21262d;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #30363d;
  border-color: #8b949e;
}

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

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 11px 18px;
  font-size: 0.95rem;
}

.btn-sm {
  padding: 3px 8px;
  font-size: 0.75rem;
}

.btn-icon {
  padding: 7px 12px;
}

/* Indicators and Badges */
.indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.indicator-off {
  background-color: #8c959f;
}

.indicator-on {
  background-color: var(--accent-success);
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 3px;
  background-color: #162032;
  color: var(--accent-blue-light);
  border: 1px solid #1f3a60;
}

.badge-secondary {
  color: var(--text-muted);
}

/* Layout Grid */
.container {
  max-width: 1200px;
  margin: 18px auto;
  padding: 0 16px;
  flex: 1;
  width: 100%;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

@media (max-width: 850px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
}

.card-header {
  background-color: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.3px;
}

.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

/* Segmented Control / Tabs */
.segmented-control {
  display: flex;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 2px;
  gap: 2px;
}

.tab-btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 0.8125rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: 2px;
  cursor: pointer;
}

.tab-btn.active {
  background-color: #21262d;
  color: var(--text-highlight);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Forms and Inputs */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 7px 10px;
  border-radius: 3px;
  font-size: 0.85rem;
  outline: none;
  width: 100%;
}

.form-control:focus {
  border-color: var(--border-focus);
}

.input-with-button {
  display: flex;
  gap: 6px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-main);
  cursor: pointer;
}

/* Info Box */
.info-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-row {
  display: flex;
  font-size: 0.775rem;
}

.info-label {
  width: 85px;
  color: var(--text-muted);
  font-weight: 600;
}

.info-value {
  color: var(--text-highlight);
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Dropzone */
.dropzone {
  border: 1px dashed var(--border-color);
  border-radius: 4px;
  padding: 20px 14px;
  text-align: center;
  background-color: var(--bg-input);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-blue-light);
}

.file-input {
  display: none;
}

/* Advanced Box */
.advanced-box {
  background-color: #14171d;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 8px 10px;
  font-size: 0.8125rem;
}

.advanced-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-muted);
  outline: none;
}

.advanced-box summary:hover {
  color: var(--text-highlight);
}

/* Device Stat Grid */
.device-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.stat-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.stat-value {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-highlight);
  font-family: var(--font-mono);
}

/* Guide Box */
.guide-box {
  background-color: #14171d;
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 3px 3px 0;
  padding: 8px 12px;
  font-size: 0.8rem;
}

.guide-box h4 {
  color: var(--accent-blue-light);
  margin-bottom: 4px;
  font-size: 0.8125rem;
}

.guide-box ol {
  padding-left: 16px;
  color: #c9d1d9;
}

.guide-box li {
  margin-bottom: 2px;
}

/* Progress Bar */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.775rem;
  font-family: var(--font-mono);
}

.progress-track {
  height: 10px;
  background-color: var(--bg-input);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-bar {
  height: 100%;
  background-color: var(--accent-blue);
  transition: width 0.1s ease;
}

/* Terminal Console */
.console-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.console {
  background-color: #080a0d;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #3fb950;
  height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.4;
}

/* Alerts */
.alert {
  padding: 8px 16px;
  font-size: 0.8125rem;
  border-bottom: 1px solid transparent;
}

.alert-danger {
  background-color: #cf222e;
  color: #ffffff;
  border-color: #a40e26;
}

/* Footer */
.footer {
  text-align: center;
  padding: 14px;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
}