:root {
  --bg: #ffffff;
  --fg: #212529;
  --section-bg: #ffffff;
  --border: #e1e4e8;
  --console-bg: #f8f9fa;
  --console-fg: #212529;
  --input-bg: #ffffff;
  --input-fg: #212529;
  --input-border: #ced4da;
  --input-focus: #86b7fe;
  --muted: #6c757d;
  --progress-track: #e9ecef;
  --progress-text: #ffffff;

  /* Tooltip */
  --tooltip-bg: #212529;
  --tooltip-fg: #ffffff;

}

html.dark {
  --bg: #20242b;
  --fg: #c9d1d9;
  --section-bg: #1a1f26;
  --border: #22303c;
  /* keep console as dark */
  --console-bg: #0d1117;
  --console-fg: #c9d1d9;
  --input-bg: #1a1f26;
  --input-fg: #e6edf3;
  --input-border: #2b3a48;
  --input-focus: #3b82f6;
  --muted: #8b949e;
  --progress-track: #1f2a33;
  --progress-text: #c9d1d9;

  .bg-warning-subtle {
    background-color: #ffc10773 !important;
  }
  .form-check-input:not(:checked) {
    background-color: #ffffff;
  }

  /* Tooltip */
  --tooltip-bg: #e6edf3;
  --tooltip-fg: #0f141a;

}

/* Gradient text animation */
.gradient-text {
  background: linear-gradient(
    90deg,
    #667eea 0%,
    #764ba2 20%,
    #f093fb 40%,
    #4facfe 60%,
    #00f2fe 80%,
    #667eea 100%
  );
  background-size: 200% auto;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 5s ease-in-out infinite;
  font-weight: 500;
}

@keyframes gradient-shift {
  0% {
    background-position: 0% center;
  }
  100% {
    background-position: 200% center;
  }
}

/* Fallback for non-Bootstrap tooltip implementations */
.tooltip .tooltip-inner { background-color: var(--tooltip-bg); color: var(--tooltip-fg); }

/* Bootstrap tooltip theming override: ensure arrow matches background */
.tooltip {
  --bs-tooltip-bg: var(--tooltip-bg);
  --bs-tooltip-color: var(--tooltip-fg);
  --bs-tooltip-opacity: 1;
  --bs-tooltip-arrow-color: var(--tooltip-bg);
}

body {
  padding: 16px;
  background: var(--bg);
  color: var(--fg);
}

/* Custom Dropdown */
.custom-dropdown {
  position: relative;
  width: 250px;
}

.custom-dropdown-toggle {
  width: 100%;
  padding: 8px 12px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 10px;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.custom-dropdown-toggle:hover {
  border-color: var(--input-focus);
}

.custom-dropdown-toggle:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.custom-dropdown.open .custom-dropdown-toggle {
  border-color: var(--input-focus);
}

.dropdown-icon {
  height: 2em;
  width: auto;
  vertical-align: middle;
}

.dropdown-text {
  flex: 1;
}

.custom-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  display: none;
  overflow: hidden;
}

.custom-dropdown.open .custom-dropdown-menu {
  display: block;
}

.custom-dropdown-item {
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: background-color 0.15s;
}

.custom-dropdown-item:hover {
  background-color: rgba(13, 110, 253, 0.1);
}

.custom-dropdown-item.selected {
  background-color: rgba(13, 110, 253, 0.15);
  font-weight: 500;
}

.section {
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: 6px;
  margin-bottom: 12px;
  background: var(--section-bg);
}

.console-wrap {
  resize: vertical;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--console-bg);
  height: 220px;
}

/* Hide RX/TX lines when toggles are off */
.console-wrap.hide-rx .log-rx { display: none; }
.console-wrap.hide-tx .log-tx { display: none; }

#log {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  color: var(--console-fg);
  padding: 8px;
}

.log-line { white-space: pre; }

/* Log colors - light default */
.log-app { color: #0d6efd; }
.log-rx  { color: #198754; }
.log-tx  { color: #b8860b; }

/* Log colors - dark overrides */
html.dark .log-app { color: #9cdcfe; }
html.dark .log-rx  { color: #7ee787; }
html.dark .log-tx  { color: #e3b341; }

.form-readonly input { background: var(--input-bg); color: var(--input-fg); }

.btn { display: inline-flex; align-items: center; white-space: nowrap; }
.btn .bi { line-height: 1; }

/* Lightweight modal */
.modal-backdrop-lite {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5);
  display: flex; align-items: center; justify-content: center; z-index: 1050;
}

.modal-card-lite {
  background: var(--section-bg);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .2);
  width: min(640px, calc(100vw - 32px));
  max-width: 70vw;
  max-height: 70vh;
  width: 100%;
  height: auto;
  overflow: hidden;
}

.modal-card-lite .modal-header { padding: .75rem 1rem; border-bottom: 1px solid var(--border); }
.modal-card-lite .modal-body   { padding: 1rem; }
.modal-card-lite .modal-footer { padding: .75rem 1rem; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: .5rem; }

/* Theme toggle icons */
.theme-icon-moon { display: none; }
html.dark .theme-icon-sun { display: none; }
html.dark .theme-icon-moon { display: inline; }

/* Inputs/selects in themes */
.form-control, .form-select {
  background-color: var(--input-bg);
  color: var(--input-fg);
  border-color: var(--input-border);
}

.form-control:focus, .form-select:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 .2rem rgba(13, 110, 253, 0.25);
  background-color: var(--input-bg);
  color: var(--input-fg);
  caret-color: var(--input-fg);
}
.form-control:active { background-color: var(--input-bg); color: var(--input-fg); }

.form-control::placeholder { color: color-mix(in srgb, var(--input-fg) 50%, transparent); opacity: .7; }

.form-control:disabled, .form-control[readonly] {
  background-color: color-mix(in srgb, var(--input-bg) 90%, transparent);
  color: color-mix(in srgb, var(--input-fg) 70%, transparent);
  border-color: var(--input-border);
  opacity: 1;
}

.form-select:disabled {
  background-color: color-mix(in srgb, var(--input-bg) 90%, transparent);
  color: color-mix(in srgb, var(--input-fg) 70%, transparent);
  border-color: var(--input-border);
}

/* Checkbox/switch theming */
.form-check-input { background-color: var(--input-bg); border-color: var(--input-border); }
.form-check-input:checked { background-color: #0d6efd; border-color: #0d6efd; }
.form-check-input:disabled { background-color: color-mix(in srgb, var(--input-bg) 90%, transparent); }

/* Light theme: keep disabled switches visible with subtle primary tint */
html:not(.dark) .form-check-input:disabled { background-color: #cfe2ff; border-color: #cfe2ff; opacity: 1; }
html:not(.dark) .form-check-input:checked:disabled { background-color: #9ec5fe; border-color: #9ec5fe; }

/* Muted text in dark */
.text-muted { color: var(--muted) !important; }

/* Make dark buttons readable in dark theme */
html.dark .btn-dark { background-color: #f8f9fa; color: #212529; border-color: #f8f9fa; }
html.dark .btn-dark:hover { background-color: #e9ecef; border-color: #e9ecef; }
html.dark .btn-outline-dark { color: #f8f9fa; border-color: #f8f9fa; }
html.dark .btn-outline-dark:hover { background-color: #f8f9fa; color: #212529; border-color: #f8f9fa; }

/* Large slider toggle with sun/moon */
.theme-toggle { position: relative; width: 64px; height: 32px; }
.theme-toggle input { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; z-index: 2; }
.theme-toggle-label { display: flex; align-items: center; justify-content: space-between; width: 100%; height: 100%; padding: 2px 8px 0 6px; border: 1px solid var(--border); border-radius: 999px; background: var(--section-bg); position: relative; user-select: none; }
.theme-toggle-label .bi { font-size: 1.1rem; line-height: 1; }
.theme-toggle .handle { position: absolute; top: 2px; left: 2px; width: 26px; height: 26px; border-radius: 50%; background: var(--bg); border: 1px solid var(--border); transition: transform .2s ease-in-out; }
.theme-toggle input:checked + .theme-toggle-label .handle { transform: translateX(32px); }

/* Hide native file button; keep only the field */
input[type="file"].form-control::file-selector-button { display: none; }
input[type="file"].form-control::-webkit-file-upload-button { visibility: hidden; }
input[type="file"].form-control { color: var(--input-fg); background-color: var(--input-bg); }
input[type="file"].form-control:focus { background-color: var(--input-bg); color: var(--input-fg); }

/* Autofill theming to avoid white background */
input:-webkit-autofill, textarea:-webkit-autofill, select:-webkit-autofill {
  -webkit-text-fill-color: var(--input-fg);
  -webkit-box-shadow: 0 0 0px 1000px var(--input-bg) inset;
  box-shadow: 0 0 0px 1000px var(--input-bg) inset;
  transition: background-color 9999s ease-out 0s;
}

/* Buttons disabled state readable in dark */
.btn:disabled, .btn.disabled { opacity: .6; }

/* Progress bars track and text */
.progress { background-color: var(--progress-track); }
.progress .progress-bar { color: var(--progress-text); }

/* Footer */
.app-footer { border-top: 1px solid var(--border); color: var(--muted); }
.app-footer a { color: inherit; }
.app-footer a:hover { color: var(--fg); }
.app-footer .bi { font-size: 1.1rem; }

/* Actions spacing when wrapped */
.actions-grid > .btn { margin-bottom: 1rem;}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.radio-group > .d-flex {
  justify-content: center;
  min-width: 180px;
}

@media (max-width: 640px) {
  .radio-group {
    flex-direction: column;
    align-items: stretch;
  }
  .radio-group > .d-flex {
    width: 100%;
  }
}


/* Mobile tweaks */
@media (max-width: 576px) {
  /* 1. NVRAM buttons centered in column with auto width */
  .nv-actions { 
    flex-direction: column;
    align-items: center;
  }
  .nv-actions > .btn { 
    width: auto;
    margin-bottom: 0.5rem; 
  }

  /* 2. Actions buttons spacing already handled via margin */

  /* 3. Modal fits screen */
  .modal-card-lite { 
    width: calc(100vw - 16px); 
    margin: 0 8px; 
    max-width: 98vw;
    max-height: 98vh;
  }

  /* 4. Serial: hide controls, show note */
  /* .serial-controls { display: none; }  */
  .serial-note { display: block !important; } 

  /* 5. Mobile: show TCP panel by default; user can hide it by adding .tcp-hidden on <html> or <body> */
  /* #tcpSettingsPanel { display: block; }
  html.tcp-hidden #tcpSettingsPanel,
  body.tcp-hidden #tcpSettingsPanel { display: none !important; } */
}