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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #e4e4e7;
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

.back {
  display: inline-block;
  color: #818cf8;
  text-decoration: none;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.back:hover {
  text-decoration: underline;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #fff;
}

.subtitle {
  color: #a1a1aa;
  font-size: 1rem;
}

.editor-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  min-height: 500px;
}

.pane {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  font-weight: 500;
  color: #a1a1aa;
}

.small-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  color: #d4d4d8;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}

.small-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

textarea {
  flex: 1;
  padding: 1rem;
  font-size: 0.9rem;
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  background: transparent;
  border: none;
  color: #fff;
  resize: none;
}

textarea:focus {
  outline: none;
}

.preview {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.02);
}

/* Markdown rendered styles */
.preview h1 { font-size: 1.75rem; margin: 0 0 1rem 0; color: #fff; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 0.5rem; }
.preview h2 { font-size: 1.4rem; margin: 1.5rem 0 0.75rem 0; color: #fff; }
.preview h3 { font-size: 1.15rem; margin: 1.25rem 0 0.5rem 0; color: #fff; }
.preview h4, .preview h5, .preview h6 { font-size: 1rem; margin: 1rem 0 0.5rem 0; color: #d4d4d8; }
.preview p { margin: 0 0 1rem 0; color: #d4d4d8; }
.preview strong { color: #fff; }
.preview em { color: #a1a1aa; }
.preview a { color: #818cf8; text-decoration: underline; }
.preview ul, .preview ol { margin: 0 0 1rem 1.5rem; color: #d4d4d8; }
.preview li { margin: 0.25rem 0; }
.preview blockquote { margin: 1rem 0; padding: 0.5rem 1rem; border-left: 3px solid #818cf8; background: rgba(129, 140, 248, 0.1); color: #a1a1aa; }
.preview code { font-family: 'SF Mono', Monaco, 'Courier New', monospace; background: rgba(0,0,0,0.3); padding: 0.125rem 0.375rem; border-radius: 4px; font-size: 0.85em; color: #f87171; }
.preview pre { margin: 1rem 0; padding: 1rem; background: rgba(0,0,0,0.4); border-radius: 8px; overflow-x: auto; }
.preview pre code { background: none; padding: 0; color: #4ade80; }
.preview hr { border: none; border-top: 1px solid rgba(255,255,255,0.1); margin: 1.5rem 0; }
.preview img { max-width: 100%; border-radius: 8px; }
.preview table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.preview th, .preview td { padding: 0.5rem; border: 1px solid rgba(255,255,255,0.1); text-align: left; }
.preview th { background: rgba(0,0,0,0.2); color: #fff; }

.status {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  text-align: center;
}

.status.hidden {
  display: none;
}

.status.success {
  background: rgba(34, 197, 94, 0.2);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #71717a;
  font-size: 0.875rem;
}

footer a {
  color: #818cf8;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .editor-container {
    grid-template-columns: 1fr;
  }
  
  .pane {
    min-height: 300px;
  }
}