:root {
  --bg: #ffffff;
  --panel: #f5f5f5;
  --border: #d0d0d0;
  --text: #000000;
  --muted: #666666;
  --accent: #0066cc;
  --accent-2: #6b21a8;
  --danger: #cc0000;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.app-header, .app-footer {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: #ffffff;
}
.app-footer {
  border-top: 1px solid var(--border);
  border-bottom: none;
  color: var(--muted);
}
.app-header h1 {
  margin: 0 0 8px 0;
  font-size: 20px;
}
.controls { display: flex; gap: 8px; }

button {
  background: #e8e8e8;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto 1fr;
  gap: 12px;
  padding: 12px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}
.panel h2 { margin: 0 0 8px 0; font-size: 16px; }

.row { margin: 6px 0; display: flex; gap: 8px; align-items: center; }
.row .label { color: var(--muted); width: 180px; }

.device-list { margin-top: 8px; display: flex; flex-direction: column; gap: 6px; }
.device-item { padding: 8px; border: 1px solid var(--border); border-radius: 8px; display: flex; justify-content: space-between; align-items: center; }
.device-meta { color: var(--muted); font-size: 12px; }

#services { display: flex; flex-direction: column; gap: 8px; }
.service { border: 1px dashed var(--border); border-radius: 10px; padding: 8px; }
.service-title { color: var(--accent); font-weight: 600; margin-bottom: 6px; }
.char { display: grid; grid-template-columns: 1fr auto; gap: 6px; padding: 6px; border-radius: 8px; }
.char + .char { border-top: 1px solid var(--border); padding-top: 8px; }
.char-actions { display: flex; gap: 6px; }
.char-value { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 12px; margin-top: 4px; }
.char-value-hex { color: #0066cc; font-weight: 500; background: #f0f4ff; padding: 2px 6px; border-radius: 4px; }
.char-value-text { color: #008000; font-weight: 400; margin-left: 8px; background: #f0fff0; padding: 2px 6px; border-radius: 4px; }
.char-note { color: var(--muted); font-size: 12px; }

.write-row { display: flex; gap: 8px; }
input[type="text"] { flex: 1; background: #ffffff; color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }

.commands { margin-top: 10px; }
.add-cmd { display: flex; gap: 8px; }
.cmd-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.cmd-btn { background: #e8e8e8; border-color: #d0d0d0; }
.cmd-remove { background: #ffe8e8; border-color: #ffcccc; color: #990000; }

.log { margin-top: 8px; background: #fafafa; border: 1px solid var(--border); border-radius: 8px; padding: 8px; height: 260px; overflow: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size: 12px; }
.log-entry { display: grid; grid-template-columns: 120px 60px 1fr; gap: 8px; padding: 4px 0; border-bottom: 1px dotted var(--border); }
.log-entry:last-child { border-bottom: none; }
.log-time { color: var(--muted); }
.log-dir-send { color: #008000; }
.log-dir-recv { color: #ff8c00; }
.log-hex { color: #0066cc; }
.log-text { color: #008000; }

/* Modal Styles */
.modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.5); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.modal-content { background: var(--bg); border-radius: 8px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); max-width: 500px; width: 90%; max-height: 80vh; overflow: auto; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); padding: 0; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { color: var(--danger); }
.modal-body { padding: 16px; }
.char-info { background: var(--panel); padding: 12px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.char-info div { margin: 6px 0; }
.write-section { margin-bottom: 16px; }
.write-section h4 { margin: 0 0 8px 0; font-size: 14px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: auto; }
}

/* Toggle Button Styles */
.toggle-btn {
  padding: 10px 16px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.toggle-btn.start-btn {
  background: #667eea;
  color: white;
}

.toggle-btn.start-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.toggle-btn.start-btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.toggle-btn.start-btn:disabled {
  background: #b0b8e6;
  cursor: not-allowed;
  opacity: 0.6;
}

.toggle-btn.stop-btn {
  background:  #f5576c;
  color: white;
}

.toggle-btn.stop-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(245, 87, 108, 0.4);
}

.toggle-btn.stop-btn:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(245, 87, 108, 0.3);
}

.toggle-btn.stop-btn:disabled {
  background: #f5a9b3;
  cursor: not-allowed;
  opacity: 0.6;
}

.toggle-btn.stop-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(245, 87, 108, 0.4);
}