:root {
  --primary: #7c3aed;
  --primary-dark: #6d28d9;
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #252525;
  --bg-elevated: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #9ca3af;
  --border: #333333;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
.app-header {
  height: 60px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
}

.back-btn, .menu-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 20px;
  padding: 8px;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
}

.back-btn:active, .menu-btn:active {
  background: var(--bg-elevated);
}

.page-title {
  flex: 1;
  text-align: center;
  font-size: 20px;
  font-weight: 600;
}

/* Content Area */
.content-area {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.page {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  flex-direction: column;
  overflow-y: auto;
  padding-bottom: 80px;
}

.page.active {
  display: flex;
}

.page-header {
  padding: 20px 16px 12px;
}

.page-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Projects List */
.projects-list {
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.project-card:active {
  transform: scale(0.98);
  background: var(--bg-tertiary);
}

.project-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.project-icon {
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.project-info {
  flex: 1;
}

.project-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.project-meta {
  font-size: 13px;
  color: var(--text-secondary);
}

.project-stats {
  display: flex;
  gap: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.stat-item i {
  font-size: 12px;
}

/* Files List */
.files-list {
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.file-item:active {
  transform: scale(0.98);
  background: var(--bg-tertiary);
}

.file-icon {
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.file-icon.html { color: #e34c26; }
.file-icon.css { color: #264de4; }
.file-icon.js { color: #f0db4f; }
.file-icon.py { color: #3776ab; }
.file-icon.json { color: #10b981; }

.file-details {
  flex: 1;
}

.file-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 2px;
}

.file-size {
  font-size: 12px;
  color: var(--text-secondary);
}

.file-actions {
  display: flex;
  gap: 4px;
}

.file-action-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px;
  cursor: pointer;
  border-radius: 6px;
  font-size: 16px;
}

.file-action-btn:active {
  background: var(--bg-elevated);
}

/* Editor */
.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.editor-header .file-name {
  font-size: 15px;
  font-weight: 500;
}

.save-btn {
  background: var(--primary);
  border: none;
  color: white;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.save-btn:active {
  background: var(--primary-dark);
}

.editor-wrapper {
  flex: 1;
  position: relative;
}

/* Settings */
.settings-list {
  padding: 0 16px;
}

.settings-group {
  margin-bottom: 24px;
}

.settings-group h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.setting-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 8px;
}

.setting-item label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 15px;
}

.setting-item input[type="number"] {
  width: 70px;
  padding: 6px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
  text-align: center;
}

.switch-label {
  width: 100%;
}

.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
  background: var(--bg-elevated);
  border-radius: 14px;
  transition: background 0.3s;
}

.switch::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--text-secondary);
  top: 3px;
  left: 3px;
  transition: all 0.3s;
}

.setting-item input[type="checkbox"] {
  display: none;
}

.setting-item input[type="checkbox"]:checked + .switch {
  background: var(--primary);
}

.setting-item input[type="checkbox"]:checked + .switch::before {
  left: 23px;
  background: white;
}

/* FAB Button */
.fab-button {
  position: fixed;
  bottom: 90px;
  right: 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.4);
  transition: all 0.2s;
  z-index: 10;
}

.fab-button:active {
  transform: scale(0.95);
  background: var(--primary-dark);
}

.fab-button i {
  font-size: 16px;
}

/* Bottom Navigation */
.bottom-nav {
  height: 70px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  padding: 8px 0;
}

.nav-item {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.2s;
  font-size: 11px;
}

.nav-item i {
  font-size: 20px;
}

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

.nav-item:active {
  background: var(--bg-elevated);
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.modal-content h3 {
  font-size: 18px;
  margin-bottom: 16px;
}

.modal-content input[type="text"] {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  margin-bottom: 16px;
}

.file-type-hints {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.hint-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

.hint-btn:active {
  background: var(--primary);
  border-color: var(--primary);
}

.modal-actions {
  display: flex;
  gap: 12px;
}

.btn-primary, .btn-secondary {
  flex: 1;
  padding: 14px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

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

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

.btn-secondary:active {
  background: var(--bg-tertiary);
}

.action-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.action-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 14px 16px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  transition: all 0.2s;
}

.action-item:active {
  background: var(--bg-elevated);
}

.action-item i {
  width: 20px;
  text-align: center;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-state i {
  font-size: 64px;
  opacity: 0.3;
  margin-bottom: 16px;
}

.empty-state p {
  font-size: 15px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: 3px;
}

/* Prevent text selection on buttons */
button {
  -webkit-user-select: none;
  user-select: none;
}

/* Input focus styles */
input:focus {
  outline: none;
  border-color: var(--primary);
}