/* CSS Variables for theming */
:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --pane-bg: #f9f9f9;
  --border: #ddd;
  --header-bg: #f0f0f0;
  --chat-user-bg: #007bff;
  --chat-user-text: #ffffff;
  --chat-assistant-bg: #e9ecef;
}

/* Dark mode variables */
.dark {
  --bg: #121212;
  --text: #e0e0e0;
  --pane-bg: #1e1e1e;
  --border: #333;
  --header-bg: #1a1a1a;
  --chat-user-bg: #0d6efd;
  --chat-user-text: #ffffff;
  --chat-assistant-bg: #2d2d2d;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
}

/* Header styles */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1.2rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.5rem;
  height: 50px;
}

header h1 {
  font-size: 1.3rem;
  font-weight: 600;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.85rem;
}

/* Button styles */
button {
  background: var(--pane-bg);
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
  transition: opacity 0.2s;
}

button:hover {
  opacity: 0.8;
}

/* Main grid layout */
.grid-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  height: calc(100vh - 50px);
  gap: 1px;
  background: var(--border);
}

/* Pane styles */
.pane {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pane h2 {
  padding: 0.6rem 1rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  font-weight: 500;
  flex-shrink: 0;
}

/* Scrollable content */
.scrollable {
  flex: 1;
  overflow: auto;
  padding: 1rem;
}

/* Diagram container */
.diagram-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 90%;
}

.diagram-container svg {
  max-width: 100%;
  height: auto;
}

/* Chat messages */
#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.message {
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  max-width: 85%;
  word-wrap: break-word;
}

.message.user {
  background: var(--chat-user-bg);
  color: var(--chat-user-text);
  align-self: flex-end;
}

.message.assistant {
  background: var(--chat-assistant-bg);
  border: 1px solid var(--border);
  align-self: flex-start;
}

.message.system {
  background: transparent;
  color: var(--text);
  opacity: 0.7;
  font-size: 0.85rem;
  align-self: center;
  max-width: 100%;
  text-align: center;
}

/* Chat form */
#chat-form {
  display: flex;
  padding: 0.8rem;
  border-top: 1px solid var(--border);
  gap: 0.5rem;
  flex-shrink: 0;
}

#chat-form input {
  flex: 1;
  padding: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}

#chat-form input:focus {
  outline: none;
  border-color: #007bff;
}

#chat-form button {
  padding: 0.6rem 1.2rem;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.95rem;
}

/* Responsive: stack panes on mobile */
@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    height: auto;
    overflow-y: auto;
  }

  .pane {
    min-height: 300px;
    border-bottom: 1px solid var(--border);
  }

  body {
    overflow: auto;
  }
}