:root {
  --primary: #3B82F6;
  --secondary: #60A5FA;
  --accent: #F59E0B;
  --bg-color: #0A0F1A;
  --panel-bg: rgba(255, 255, 255, 0.05);
  --border-color: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: #9ca3af;
  --error: #ef4444;
  --border-radius: 12px;
  --transition: 0.2s ease;
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

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

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  background-color: rgba(10, 15, 26, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

h1 {
  font-size: 1.2rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--text-primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Buttons */
button {
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 20px;
  transition: all var(--transition);
  border: none;
}

.primary-btn {
  background-color: var(--primary);
  color: white;
}
.primary-btn:hover {
  background-color: #2563eb;
}

.secondary-btn {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.secondary-btn:hover {
  background-color: var(--panel-bg);
}

.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: rgba(10, 15, 26, 0.6);
  border-right: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  overflow-y: auto;
}

.settings-group h3, .stats-panel h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.toggle-control {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.template-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.template-list li {
  padding: 10px 12px;
  background-color: var(--panel-bg);
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
}

.template-list li:hover {
  border-color: var(--primary);
  background-color: rgba(59, 130, 246, 0.1);
}

.stats-panel p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}

.stats-panel span {
  color: var(--text-primary);
  font-weight: 600;
}

/* Editor Pane */
.editor-pane {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
  border-right: 1px solid var(--border-color);
  scrollbar-width: thin;
}

.thread-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 24px;
}

.add-tweet-btn {
  width: 100%;
  padding: 16px;
  background-color: transparent;
  border: 2px dashed var(--border-color);
  color: var(--secondary);
  border-radius: var(--border-radius);
  font-size: 1rem;
}
.add-tweet-btn:hover {
  border-color: var(--secondary);
  background-color: rgba(59, 130, 246, 0.05);
}

/* Tweet Editor Box */
.tweet-editor-box {
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  transition: all var(--transition);
}

.tweet-editor-box.focused {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.tweet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tweet-number {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.tweet-actions button {
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 4px 8px;
}
.tweet-actions button:hover {
  color: var(--error);
}

textarea.tweet-textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
  min-height: 80px;
}
textarea.tweet-textarea:focus {
  outline: none;
}

.tweet-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  margin-top: 4px;
}

.tools {
  display: flex;
  gap: 12px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--secondary);
  cursor: pointer;
  padding: 4px;
}
.icon-btn:hover {
  color: var(--primary);
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.char-count.warning {
  color: var(--accent);
}
.char-count.error {
  color: var(--error);
}

/* Preview Pane */
.preview-pane {
  width: 400px;
  background-color: #05080f;
  border-left: 1px solid var(--border-color);
  padding: 32px;
  overflow-y: auto;
}

.preview-pane h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.preview-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

/* Connecting line for thread */
.preview-list::before {
  content: '';
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: 23px;
  width: 2px;
  background-color: var(--border-color);
  z-index: 0;
}

.tweet-preview {
  display: flex;
  gap: 12px;
  background-color: transparent;
  padding-bottom: 16px;
  position: relative;
  z-index: 1;
}

.preview-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--panel-bg);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-weight: bold;
}

.preview-content {
  flex: 1;
}

.preview-header {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 4px;
}

.preview-name {
  font-weight: 700;
  font-size: 0.875rem;
}

.preview-handle {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.preview-text {
  font-size: 0.875rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}