/* =============================================================================
   GitHub Document Manager - Styles
   ============================================================================= */

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #2ea44f;
  --color-primary-hover: #22863a;
  --color-danger: #d73a49;
  --color-danger-hover: #cb2431;
  --color-secondary: #6a737d;
  --color-secondary-hover: #586069;

  --color-bg: #ffffff;
  --color-bg-secondary: #f6f8fa;
  --color-bg-tertiary: #e1e4e8;

  --color-text: #24292e;
  --color-text-secondary: #586069;
  --color-text-muted: #6a737d;

  --color-border: #e1e4e8;
  --color-border-dark: #d1d5da;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --sidebar-width: 300px;
  --header-height: 60px;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
}

#app {
  height: 100%;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.view {
  height: 100%;
}

/* =============================================================================
   Buttons
   ============================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  color: #ffffff;
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-bg-tertiary);
}

.btn-danger {
  color: #ffffff;
  background-color: var(--color-danger);
  border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 16px;
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 12px;
}

.btn-block {
  width: 100%;
}

.icon {
  flex-shrink: 0;
}

/* =============================================================================
   Form Elements
   ============================================================================= */

.label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.select-wrapper {
  position: relative;
}

.select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23586069' d='M6 8.5l-4-4h8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(46, 164, 79, 0.2);
}

.input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(46, 164, 79, 0.2);
}

/* =============================================================================
   Login View
   ============================================================================= */

#login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
  max-width: 400px;
  padding: var(--spacing-xl);
  text-align: center;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.login-container h1 {
  margin-bottom: var(--spacing-sm);
  font-size: 24px;
  color: var(--color-text);
}

.login-container .subtitle {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.login-container .info-text {
  margin-top: var(--spacing-lg);
  font-size: 12px;
  color: var(--color-text-muted);
}

/* =============================================================================
   Dashboard View
   ============================================================================= */

#dashboard-view {
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--spacing-lg);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-title {
  font-size: 18px;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 14px;
  color: var(--color-text-secondary);
}

.user-info img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
}

/* Main Content Layout */
.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  width: var(--sidebar-width);
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
}

.sidebar-section {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-section:last-child {
  border-bottom: none;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.sidebar-section .btn {
  margin-top: var(--spacing-sm);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 12px;
}

.breadcrumb-item {
  color: var(--color-text-secondary);
}

.breadcrumb-item.clickable {
  color: var(--color-primary);
  cursor: pointer;
}

.breadcrumb-item.clickable:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--color-text-muted);
}

/* File List */
.file-list-section {
  min-height: 200px;
}

.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.file-list-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.file-list {
  flex: 1;
  list-style: none;
  overflow-y: auto;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.file-list-empty {
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 12px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.file-item:last-child {
  border-bottom: none;
}

.file-item:hover {
  background-color: var(--color-bg-secondary);
}

.file-item.active {
  background-color: rgba(46, 164, 79, 0.1);
}

.file-item-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
}

.file-item-name {
  flex: 1;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-item-delete {
  opacity: 0;
  padding: var(--spacing-xs);
  color: var(--color-danger);
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.file-item:hover .file-item-delete {
  opacity: 1;
}

/* =============================================================================
   Editor Panel
   ============================================================================= */

.editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  color: var(--color-text-muted);
}

.editor-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.editor-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.editor-filename {
  font-weight: 600;
}

.editor-status {
  font-size: 12px;
  color: var(--color-text-muted);
}

.editor-status.modified {
  color: var(--color-danger);
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.editor {
  flex: 1;
  padding: var(--spacing-lg);
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: none;
  resize: none;
}

.editor:focus {
  outline: none;
}

/* Version Dropdown */
.version-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 100;
  min-width: 300px;
  max-height: 400px;
  margin-top: var(--spacing-xs);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.dropdown-header {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.version-list {
  list-style: none;
  max-height: 350px;
  overflow-y: auto;
}

.version-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.version-item:last-child {
  border-bottom: none;
}

.version-item:hover {
  background-color: var(--color-bg-secondary);
}

.version-item.active {
  background-color: rgba(46, 164, 79, 0.1);
}

.version-message {
  font-size: 13px;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.version-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 11px;
  color: var(--color-text-muted);
}

/* =============================================================================
   Loading Overlay
   ============================================================================= */

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background-color: rgba(255, 255, 255, 0.9);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-message {
  color: var(--color-text-secondary);
}

/* =============================================================================
   Modal
   ============================================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal {
  width: 90%;
  max-width: 500px;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-close {
  padding: var(--spacing-xs);
  font-size: 24px;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
}

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

.modal-content {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

/* Form Group in Modal */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

/* =============================================================================
   Toast Notifications
   ============================================================================= */

.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 600;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  min-width: 300px;
  max-width: 400px;
  background-color: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
}

.toast.success {
  background-color: var(--color-primary);
}

.toast.error {
  background-color: var(--color-danger);
}

.toast-message {
  flex: 1;
}

.toast-close {
  padding: var(--spacing-xs);
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.7;
}

.toast-close:hover {
  opacity: 1;
}

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

/* =============================================================================
   Responsive Design
   ============================================================================= */

@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
  }

  .main-content {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .editor-panel {
    min-height: 50vh;
  }

  .header {
    padding: 0 var(--spacing-md);
  }

  .header-title {
    font-size: 14px;
  }

  .dropdown-menu {
    min-width: 250px;
  }
}