:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f4f4f4;
  --text-primary: #000000;
  --text-secondary: #555555;
  --accent-color: #000000;
  --border-color: #e0e0e0;
  --font-main: 'Inter', sans-serif;
  --base-font-size: 16px;
}

[data-theme="dark"] {
  --bg-primary: #050505;
  --bg-secondary: #111111;
  --text-primary: #ffffff;
  --text-secondary: #aaaaaa;
  --accent-color: #ffffff;
  --border-color: #333333;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-size: var(--base-font-size);
}

/* APP CONTAINER */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.02);
}

/* HEADER / TOP NAV */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  border-bottom: 2px solid var(--text-primary);
  background-color: var(--bg-primary);
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-mark {
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -2px;
  color: var(--text-primary);
}

.brand h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-btn {
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem 0;
  position: relative;
  text-transform: uppercase;
  transition: color 0.3s ease;
}

.nav-btn:hover {
  color: var(--text-primary);
}

.nav-btn.active {
  color: var(--text-primary);
}

.nav-btn.active::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.dot {
  width: 8px;
  height: 8px;
  background-color: #000000;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* CHAT INTERFACE */
.chat-interface {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.chat-feed {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  scroll-behavior: smooth;
}

.message {
  max-width: 80%;
  animation: fadeIn 0.4s ease forwards;
}

.message.ai-message {
  align-self: flex-start;
}

.message.user-message {
  align-self: flex-end;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.message.user-message .message-header {
  flex-direction: row-reverse;
}

.sender {
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.timestamp {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.message-body {
  padding: 1rem 1.5rem;
  font-size: 1rem;
  line-height: 1.6;
  border-radius: 2px;
}

.ai-message .message-body {
  background-color: var(--bg-primary);
  border-left: 4px solid var(--text-primary);
  color: var(--text-primary);
}

.user-message .message-body {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* INPUT SECTION */
.input-section {
  padding: 2rem;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.input-wrapper {
  display: flex;
  border: 2px solid var(--text-primary);
  background-color: var(--bg-primary);
  transition: box-shadow 0.3s ease;
}

.input-wrapper:focus-within {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

#prompt-input {
  flex: 1;
  padding: 1.25rem 1.5rem;
  border: none;
  background: transparent;
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--text-primary);
  resize: none;
  outline: none;
  line-height: 1.5;
}

#prompt-input::placeholder {
  color: #999;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.transmit-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 2rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.transmit-btn:hover {
  background-color: #333333;
}

.transmit-btn svg {
  transition: transform 0.3s ease;
}

.transmit-btn:hover svg {
  transform: translateX(4px) translateY(-4px);
}

.system-metrics {
  display: flex;
  justify-content: space-between;
  margin-top: 0.75rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .app-container {
    border: none;
  }
  .input-section {
    padding: 1rem;
  }
  .transmit-btn {
    padding: 0 1rem;
  }
  .transmit-btn span {
    display: none;
  }
}

/* MARKDOWN & CODE PREVIEW STYLES */
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 800;
}

.markdown-body p {
  margin-bottom: 1rem;
}

.markdown-body ul, .markdown-body ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.markdown-body a {
  color: var(--text-primary);
  text-decoration: underline;
  font-weight: 600;
}

.markdown-body strong {
  font-weight: 800;
}

.code-block-wrapper {
  margin: 1.5rem 0;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.code-block-header {
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.25rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.markdown-body pre {
  padding: 1rem;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
}

.markdown-body code {
  font-family: 'Courier New', monospace;
  background: var(--border-color);
  padding: 0.1rem 0.3rem;
  font-size: 0.85em;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
}

.code-preview-container {
  margin: 1.5rem 0 -1.5rem 0;
  border: 2px solid var(--text-primary);
  border-bottom: none;
  background: var(--bg-primary);
  position: relative;
  z-index: 10;
}

.code-preview-header {
  background: var(--text-primary);
  color: #00ff00;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.code-preview-header::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: #00ff00;
  border-radius: 50%;
  box-shadow: 0 0 4px #00ff00;
}

.code-preview-content {
  padding: 1rem;
  min-height: 100px;
  overflow: hidden;
  border-bottom: 2px solid var(--text-primary);
}

/* Transmitting Pulse Text */
.pulse-text {
  animation: textPulse 1s infinite alternate;
  font-weight: 800;
  letter-spacing: 0.1em;
}

@keyframes textPulse {
  from { opacity: 1; }
  to { opacity: 0.3; }
}

/* TERMINATE BUTTON */
.terminate-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 2rem;
  background-color: #ff3333;
  color: var(--bg-primary);
  border: none;
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  transition: background-color 0.3s ease;
}

.terminate-btn:hover {
  background-color: #cc0000;
}

/* MODALS */
.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease forwards;
}

.modal-content {
  background: var(--bg-primary);
  border: 2px solid var(--text-primary);
  width: 90%;
  max-width: 500px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.modal-header {
  background: var(--text-primary);
  color: var(--bg-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
}

.modal-header h2 {
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.close-btn {
  background: none;
  border: none;
  color: var(--bg-primary);
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
}

.modal-body {
  padding: 2rem 1.5rem;
  font-family: 'Space Mono', 'Courier New', monospace;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.modal-body p {
  margin-bottom: 0.75rem;
}

/* SETTINGS FORM */
.setting-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.setting-group label {
  font-weight: 800;
  letter-spacing: 0.1em;
  font-size: 0.85rem;
  font-family: var(--font-main);
}

.setting-group select {
  padding: 0.75rem;
  font-family: var(--font-main);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  outline: none;
  font-size: 1rem;
}

.save-settings-btn {
  width: 100%;
  padding: 1rem;
  margin-top: 1rem;
  background: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  font-family: var(--font-main);
  font-weight: 800;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.save-settings-btn:hover {
  opacity: 0.8;
}