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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #222531;
  --border: #2a2d3a;
  --text: #e4e4e7;
  --text-muted: #8b8d98;
  --primary: #7c5cfc;
  --primary-hover: #6a4ae8;
  --error: #ef4444;
  --success: #22c55e;
  --radius: 8px;
}

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

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

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

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 0.25rem;
  font-size: 0.95rem;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--surface);
  padding: 4px;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.tab {
  flex: 1;
  padding: 0.6rem 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  background: var(--primary);
  color: #fff;
}

/* Tab Content */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Form */
.form-group {
  margin-bottom: 1rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

input[type="text"],
input[type="url"],
textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

/* Buttons */
.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  width: 100%;
  justify-content: center;
  margin-top: 0.5rem;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
}

.btn-small {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem 0.5rem;
}

.btn-small:hover {
  color: var(--error);
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 1rem;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(124, 92, 252, 0.05);
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.upload-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 0.3rem;
}

.file-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.9rem;
  background: var(--surface);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1.5rem;
  color: var(--text-muted);
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Error */
.error {
  padding: 0.8rem 1rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius);
  color: var(--error);
  font-size: 0.9rem;
  margin-top: 1rem;
}

/* Result */
.result {
  margin-top: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.result-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
}

.result-tabs {
  display: flex;
  gap: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.result-tab {
  padding: 0.5rem 1.2rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.result-tab:hover {
  color: var(--text);
}

.result-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.preview {
  padding: 1.2rem;
  max-height: 500px;
  overflow-y: auto;
}

.preview pre {
  margin: 0;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text);
}

.rendered {
  font-size: 0.9rem;
  line-height: 1.7;
}

.rendered h1, .rendered h2, .rendered h3 {
  margin-top: 1.2rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.rendered h1 { font-size: 1.5rem; }
.rendered h2 { font-size: 1.25rem; }
.rendered h3 { font-size: 1.1rem; }

.rendered p {
  margin-bottom: 0.8rem;
}

.rendered ul, .rendered ol {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
}

.rendered li {
  margin-bottom: 0.3rem;
}

.rendered a {
  color: var(--primary);
}

.rendered code {
  background: var(--surface);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.rendered pre code {
  display: block;
  padding: 0.8rem;
  border-radius: var(--radius);
  overflow-x: auto;
}

.rendered blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  .result-header {
    flex-direction: column;
    gap: 0.8rem;
    align-items: flex-start;
  }

  .result-actions {
    width: 100%;
  }

  .result-actions .btn {
    flex: 1;
    justify-content: center;
  }
}