/* ==================== RESET & BASE ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: #2d3748;
  background: #f7fafc;
  line-height: 1.5;
}

/* ==================== LOADER ==================== */
#loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: none;
  justify-content: center; 
  align-items: center;     
  background-color: rgba(255, 255, 255, 0.8);
  z-index: 9999; 
  display: none; 
}

#loader video {
  width: 200px;
  height: 200px;
  object-fit: contain;
}

#error-msg {
  display: none;
  color: #7f1d1d;
  font-size: 0.9rem;
  margin-top: 8px;
  padding: 6px 0;
  border-top: 2px solid #fca5a5;
  font-weight: 500;
  animation: slideDown 0.3s ease-out;
}

#simplify-hint {
  display: none;
  color: #3912c5;
  font-size: 0.9rem;
  margin-top: 8px;
  padding: 6px 0;
  border-top: 2px solid #fca5a5;
  font-weight: 500;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Simplify Graph Popup */
.simplify-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  text-align: center;
  animation: slideUp 0.3s ease-out;
  max-width: 90%;
}

/* ==================== HEADER ==================== */
.app-header {
  height: 64px;
  background: #1a202c;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-bottom: 1px solid #0f1419;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.app-header .brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-logo {
  width: auto;
  height: 60px;
  object-fit: contain;
}

.app-header h1 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* ==================== LAYOUT ==================== */
#app-container {
  display: flex;
  height: calc(100vh - 64px);
  gap: 0;
}

#notes-panel {
  width: 45%;
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
  overflow: hidden;
}


.placeholder-logo {
  width: 350px;;
  height: auto;
  margin-bottom: 16px;
  opacity: 0.5;
}

#flow-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #edf2f7;
  position: relative;
  overflow: hidden;
}

/* ==================== TOOLBAR ==================== */
#editor-toolbar {
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  background: #f7fafc;
  border-bottom: 1px solid #e2e8f0;
  flex-wrap: wrap;
}

#editor-toolbar button {
  padding: 6px 10px;
  border: 1px solid #cbd5e0;
  background: #ffffff;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  font-size: 12px;
  transition: all 0.2s ease;
}

#editor-toolbar button:hover {
  background: #edf2f7;
  border-color: #a0aec0;
}

#editor-toolbar button:active {
  background: #e2e8f0;
}

/* ==================== EDITOR ==================== */
#editor {
  flex: 1;
  padding: 20px 24px;
  background: #ffffff;
  margin: 12px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  overflow-y: auto;
  font-size: 15px;
  line-height: 1.6;
}

#editor:focus {
  outline: none;
  border-color: #4299e1;
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

#editor h1 {
  font-size: 24px;
  font-weight: 700;
  margin: 16px 0 8px;
}

#editor h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 14px 0 6px;
  color: #1a202c;
}

#editor h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 12px 0 4px;
  color: #2d3748;
}

#editor h4 {
  font-size: 16px;
  font-weight: 500;
  margin: 10px 0 2px;
  color: #4a5568;
}

#editor p {
  margin-bottom: 10px;
}

#editor ul, #editor ol {
  margin-left: 20px;
  margin-bottom: 10px;
}

#editor li {
  margin-bottom: 4px;
}

/* ==================== EDITOR CONTROLS ==================== */
#editor-controls {
  display: flex;
  gap: 8px;
  padding: 12px;
  background: #f7fafc;
  border-top: 1px solid #e2e8f0;
  align-items: center;
  flex-wrap: wrap;
}

#format-generate-flow {
  flex: 1;
  min-width: 140px;
}

#generate-flow {
  flex: 1;
  min-width: 120px;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid #cbd5e0;
  border-radius: 10px;
  background: #f8fafc;
  color: #334155;
  font-size: 14px;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  cursor: pointer;
}

.checkbox-label:hover {
  background: #edf2f7;
  border-color: #94a3b8;
  transform: translateY(-1px);
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  accent-color: #2563eb;
  cursor: pointer;
}

/* ==================== BUTTONS ==================== */
.btn {
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-primary {
  background: #2563eb;
  color: white;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-primary:active {
  background: #1e40af;
}

.btn-secondary {
  background: #e2e8f0;
  color: #2d3748;
  border: 1px solid #cbd5e0;
}

.btn-secondary:hover {
  background: #cbd5e0;
}

.btn-secondary:active {
  background: #a0aec0;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  background: #ffffff;
  color: #2d3748;
  border: 1px solid #cbd5e0;
  border-radius: 6px;
}

.btn-icon:hover {
  background: #edf2f7;
  border-color: #a0aec0;
}

.btn-icon:active {
  background: #e2e8f0;
}

/* ==================== GRAPH PANEL ==================== */
#flow-panel {
  flex: 1;
  width: 100%;
  background: #edf2f7;
  position: relative;
  overflow: hidden;
}

#placeholder {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: #a0aec0;
  pointer-events: none;
}

#placeholder p {
  margin: 4px 0;
  font-size: 15px;
}

#placeholder .hint {
  font-size: 13px;
  color: #cbd5e0;
}

/* ==================== GRAPH CONTROLS ==================== */
#graph-controls {
  position: absolute;
  bottom: 16px;
  left: 16px;
  display: flex;
  gap: 8px;
  background: rgba(255, 255, 255, 0.95);
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.control-group {
  display: flex;
  gap: 4px;
  border-right: 1px solid #e2e8f0;
  padding-right: 8px;
}

.control-group:last-child {
  border-right: none;
  padding-right: 0;
}

/* ==================== MOBILE RESPONSIVE ==================== */
@media (max-width: 1024px) {
  #notes-panel {
    width: 50%;
  }
}

@media (max-width: 768px) {
  #app-container {
    flex-direction: column;
  }

  #notes-panel {
    width: 100%;
    height: 50%;
    border-right: none;
    border-bottom: 1px solid #e2e8f0;
  }

  #flow-container {
    width: 100%;
    height: 50%;
  }

  #editor-toolbar {
    flex-direction: row;
    padding: 6px 8px;
  }

  #editor-toolbar button {
    padding: 4px 8px;
    font-size: 11px;
  }

  #editor {
    padding: 16px;
    margin: 8px;
    font-size: 14px;
  }

  #editor-controls {
    padding: 8px;
    gap: 6px;
  }

  #format-generate-flow,
  #generate-flow {
    flex: 1;
    min-width: 80px;
    padding: 6px 10px;
    font-size: 12px;
  }

  #graph-controls {
    bottom: 12px;
    left: 12px;
    padding: 6px;
    gap: 4px;
  }

  .control-group {
    gap: 2px;
    padding-right: 6px;
  }

  .btn-icon {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .app-header h1 {
    font-size: 16px;
  }

  #notes-panel {
    height: 45%;
  }

  #flow-container {
    height: 55%;
  }

  #editor {
    padding: 12px;
    margin: 6px;
    font-size: 13px;
  }

  #editor-controls {
    flex-direction: column;
  }

  #format-generate-flow,
  #generate-flow {
    width: 100%;
  }

  .checkbox-label {
    width: 100%;
  }

  #graph-controls {
    flex-direction: column;
    gap: 2px;
    bottom: 8px;
    left: 8px;
  }

  .control-group {
    flex-direction: column;
    gap: 2px;
    padding-right: 0;
    border-right: none;
  }

  .btn-icon {
    width: 28px;
    height: 28px;
    font-size: 11px;
  }
}

/* ==================== SCROLLBARS ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e0;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a0aec0;
}