:root {
  --bg-page: #010409;
  --bg-surface: #0d1117;
  --bg-card: #161b22;
  --bg-hover: #21262d;
  --border-color: #30363d;
  --border-subtle: #21262d;
  --text-primary: #c9d1d9;
  --text-bright: #f0f6fc;
  --text-muted: #8b949e;
  --accent-green: #3fb950;
  --accent-green-hover: #2ea043;
  --accent-blue: #58a6ff;
  --accent-blue-hover: #79c0ff;
  --danger: #f85149;
  --danger-hover: #da3633;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Prompt and Brand */
.prompt {
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-weight: bold;
}

/* Login View */
#login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

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

.login-header h2 {
  color: var(--text-bright);
  font-size: 1.3rem;
  font-family: var(--font-mono);
  margin: 0.5rem 0;
}

.login-header p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.input-group {
  margin-bottom: 1.5rem;
}

.input-group label,
.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="password"],
input[type="date"] {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-bright);
  padding: 0.65rem 0.85rem;
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  text-decoration: none;
  font-family: inherit;
}

.btn-block { width: 100%; }

.btn-primary {
  background-color: #238636;
  color: #fff;
  border-color: rgba(240, 246, 252, 0.1);
}
.btn-primary:hover { background-color: #2ea043; }

.btn-success {
  background-color: var(--accent-green);
  color: #010409;
  font-weight: 600;
}
.btn-success:hover { background-color: var(--accent-green-hover); }

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-outline:hover {
  background-color: var(--bg-hover);
  color: var(--text-bright);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover {
  color: var(--text-bright);
  background-color: var(--bg-hover);
}

.btn-danger {
  background-color: rgba(248, 81, 73, 0.1);
  color: var(--danger);
  border-color: rgba(248, 81, 73, 0.3);
}
.btn-danger:hover {
  background-color: var(--danger);
  color: #fff;
}

.error-msg {
  margin-top: 1rem;
  padding: 0.75rem;
  background-color: rgba(248, 81, 73, 0.1);
  border: 1px solid rgba(248, 81, 73, 0.4);
  color: var(--danger);
  border-radius: 6px;
  font-size: 0.85rem;
  text-align: center;
}

/* App View Layout */
#app-view {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.navbar {
  height: 56px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  flex-shrink: 0;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-title {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-bright);
  font-size: 1.05rem;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--bg-card);
  color: var(--accent-green);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.45rem;
  border-radius: 12px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 320px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-header h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pill {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-bright);
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.posts-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.post-card {
  padding: 0.85rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.post-card:hover {
  border-color: var(--accent-blue);
  background-color: var(--bg-hover);
}

.post-card.active {
  border-color: var(--accent-green);
  background-color: rgba(63, 185, 80, 0.08);
}

.post-card-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.post-card-title {
  color: var(--text-bright);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.post-card-desc {
  color: var(--text-muted);
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.loading-state,
.empty-sidebar {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

/* Editor Panel */
.editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-page);
  overflow: hidden;
}

.meta-section {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.meta-row {
  display: flex;
  gap: 1rem;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

/* Toolbar */
.toolbar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0.4rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
  margin: 0 0.4rem;
}

.push-right {
  margin-left: auto;
}

.tool-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-primary);
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.tool-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-bright);
  border-color: var(--border-color);
}

.stats-text {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Split View Editor */
.split-editor {
  flex: 1;
  display: flex;
  overflow: hidden;
}

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

.editor-pane {
  border-right: 1px solid var(--border-color);
}

.pane-header {
  padding: 0.4rem 1rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
}

#markdown-input {
  flex: 1;
  width: 100%;
  background-color: var(--bg-page);
  color: var(--text-bright);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.7;
  padding: 1.25rem;
  border: none;
  outline: none;
  resize: none;
  overflow-y: auto;
}

.preview-pane {
  background-color: var(--bg-surface);
}

.preview-content {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 1rem;
}

/* Markdown preview styling */
.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4 {
  color: var(--text-bright);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}
.preview-content h1:first-child { margin-top: 0; }
.preview-content p { margin-bottom: 1.2rem; }
.preview-content strong { color: var(--text-bright); }
.preview-content a { color: var(--accent-blue); text-decoration: none; }
.preview-content a:hover { text-decoration: underline; }
.preview-content ul,
.preview-content ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
}
.preview-content li { margin-bottom: 0.4rem; }
.preview-content blockquote {
  border-left: 3px solid var(--accent-green);
  padding: 0.5rem 0 0.5rem 1rem;
  margin: 1.2rem 0;
  color: var(--text-muted);
  background-color: rgba(22, 27, 34, 0.4);
}
.preview-content code {
  font-family: var(--font-mono);
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  color: #79c0ff;
}
.preview-content pre {
  margin: 1.2rem 0;
  background-color: #0d1117 !important;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
}
.preview-content pre code {
  all: unset;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.preview-content img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

/* Action Bar */
.action-bar {
  height: 60px;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  flex-shrink: 0;
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.action-buttons {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.85rem 1.25rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-bright);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  font-size: 0.9rem;
  z-index: 1000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: var(--font-mono);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--accent-green);
  color: #3fb950;
}

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

@media (max-width: 900px) {
  .sidebar { display: none; }
  .split-editor { flex-direction: column; }
  .editor-pane { border-right: none; border-bottom: 1px solid var(--border-color); }
}