/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --border-color: #30363d;
  --accent-color: #58a6ff;
  --accent-hover: #1f6feb;
  --success-color: #3fb950;
  --error-color: #f85149;
  --warning-color: #d29922;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --border-color: #d0d7de;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Header */
header {
  background: var(--bg-secondary);
  padding: 2rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Info Box */
.info-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.info-box h2 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.info-box ul {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.info-box code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

.tab-button.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

.tab-content {
  display: none;
}

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

/* Fieldsets */
fieldset {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

legend {
  font-weight: 600;
  font-size: 1.1rem;
  padding: 0 0.5rem;
}

/* Form Elements */
.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-group {
  margin-bottom: 1rem;
  flex: 1;
  min-width: 250px;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
}

.form-group textarea {
  font-family: 'Courier New', monospace;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.form-group small {
  display: block;
  margin-top: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.hint {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Radio Buttons */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.radio-group input[type="radio"],
.form-group input[type="checkbox"] {
  cursor: pointer;
}

/* Buttons */
button,
.btn-primary,
.btn-secondary {
  padding: 0.65rem 1.2rem;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

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

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* File Tree */
.toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.file-tree {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
}

.file-tree-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.25rem;
  cursor: pointer;
  transition: background 0.2s;
}

.file-tree-item:hover {
  background: var(--bg-tertiary);
}

.file-tree-item.folder {
  font-weight: 500;
}

.file-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
}

.file-icon {
  font-size: 1.2rem;
}

.file-actions {
  display: flex;
  gap: 0.5rem;
  opacity: 0.7;
}

.file-actions button {
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
}

.file-actions button:hover {
  color: var(--accent-color);
}

.empty-tree {
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem;
}

/* File Editor */
#file-editor {
  width: 100%;
  min-height: 400px;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  overflow: auto;
}

.modal.active {
  display: block;
}

.modal-content {
  background: var(--bg-secondary);
  margin: 5% auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  width: 90%;
  max-width: 900px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 2rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
  max-height: 70vh;
  overflow-y: auto;
}

.modal-body pre {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Messages */
#message-area {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 2000;
  max-width: 400px;
}

.message {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 0.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.message.success {
  border-left: 4px solid var(--success-color);
}

.message.error {
  border-left: 4px solid var(--error-color);
}

.message.warning {
  border-left: 4px solid var(--warning-color);
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.message-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.5rem;
  padding: 0;
  line-height: 1;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  margin-top: 3rem;
}

footer a {
  color: var(--accent-color);
  text-decoration: none;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  header {
    padding: 1.5rem 1rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  main {
    padding: 1rem;
  }

  .form-row {
    flex-direction: column;
  }

  .modal-content {
    width: 95%;
    margin: 10% auto;
  }
}