@import "tailwindcss";

/* ===== CSS Variables / Theme ===== */
:root,
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f0f1f3;
  --bg-hover: #e9ecef;
  --bg-active: #dbeafe;
  --bg-sidebar: #f8f9fa;
  --text-primary: #1a1a2e;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border-color: #e5e7eb;
  --border-light: #f0f1f3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #dbeafe;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fee2e2;
  --pin-color: #f59e0b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1);
  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --transition: 150ms ease;
  --font-sans: var(--font-geist-sans), system-ui, -apple-system, sans-serif;
  --font-mono: var(--font-geist-mono), "Fira Code", "JetBrains Mono", monospace;
}

[data-theme="dark"] {
  --bg-primary: #0f0f17;
  --bg-secondary: #16161f;
  --bg-tertiary: #1e1e2a;
  --bg-hover: #262636;
  --bg-active: #1e3a5f;
  --bg-sidebar: #12121a;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --border-color: #2a2a3a;
  --border-light: #1e1e2a;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: #1e3a5f;
  --danger: #f87171;
  --danger-hover: #ef4444;
  --danger-light: #3b1111;
  --pin-color: #fbbf24;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.5);
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background var(--transition), color var(--transition);
}

/* ===== Layout ===== */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== Loading ===== */
.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--bg-primary);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===== Sidebar ===== */
.sidebar {
  width: 300px;
  min-width: 300px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  transition: all var(--transition);
  overflow: hidden;
}

.sidebar-collapsed {
  width: 52px;
  min-width: 52px;
  align-items: center;
  padding-top: 12px;
  gap: 8px;
}

.sidebar-header {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* ===== Search ===== */
.search-bar {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 34px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

/* ===== Sidebar Actions ===== */
.sidebar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-buttons {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.btn-sort {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-sort:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-sort.active {
  background: var(--accent-light);
  color: var(--accent);
}

/* ===== Buttons ===== */
.btn-primary {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-sm);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon-sm {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-icon-sm:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon-sm.pinned {
  color: var(--pin-color);
}

.btn-icon-sm.btn-danger:hover {
  background: var(--danger-light);
  color: var(--danger);
}

.btn-new-note {
  background: var(--accent);
  color: #fff !important;
  border-radius: var(--radius-sm);
}

.btn-new-note:hover {
  background: var(--accent-hover);
}

/* ===== Notes List ===== */
.notes-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.notes-list::-webkit-scrollbar {
  width: 4px;
}

.notes-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
  color: var(--text-tertiary);
  font-size: 14px;
}

.note-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 2px;
  position: relative;
}

.note-item:hover {
  background: var(--bg-hover);
}

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

.note-item-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.note-item-title {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pin-indicator {
  color: var(--pin-color);
  flex-shrink: 0;
}

.note-item-preview {
  font-size: 12px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.note-item-date {
  font-size: 11px;
  color: var(--text-tertiary);
}

.note-item-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(4px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ===== Sidebar Footer ===== */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
}

.btn-delete-all {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 7px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-delete-all:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-light);
}

.confirm-delete-all {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}

.btn-confirm-yes {
  padding: 4px 12px;
  border: none;
  border-radius: 4px;
  background: var(--danger);
  color: #fff;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-confirm-yes:hover {
  background: var(--danger-hover);
}

.btn-confirm-no {
  padding: 4px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-confirm-no:hover {
  background: var(--bg-hover);
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  position: relative;
  background: var(--bg-primary);
}

.theme-toggle-wrapper {
  position: absolute;
  top: 12px;
  right: 16px;
  z-index: 10;
}

.btn-theme {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

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

/* ===== Empty Editor ===== */
.empty-editor {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 12px;
  color: var(--text-tertiary);
}

.empty-editor h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.empty-editor p {
  font-size: 15px;
  color: var(--text-secondary);
}

.shortcut-hint {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.shortcut-hint kbd {
  padding: 2px 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ===== Editor ===== */
.editor-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.editor-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
}

.editor-title-input {
  flex: 1;
  padding: 6px 0;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 20px;
  font-weight: 700;
  outline: none;
  letter-spacing: -0.3px;
}

.editor-title-input::placeholder {
  color: var(--text-tertiary);
}

.view-mode-buttons {
  display: flex;
  gap: 2px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--border-color);
}

.btn-view {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 28px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-view:hover {
  color: var(--text-primary);
}

.btn-view.active {
  background: var(--bg-primary);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* ===== Toolbar ===== */
.toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-wrap: wrap;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 30px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.toolbar-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.toolbar-btn:active {
  background: var(--accent-light);
  color: var(--accent);
}

/* ===== Editor Body ===== */
.editor-body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.editor-body.split .editor-pane,
.editor-body.split .preview-pane {
  width: 50%;
}

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

.editor-body.edit .editor-pane {
  width: 100%;
}

.editor-body.preview .preview-pane {
  width: 100%;
}

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

.editor-textarea {
  flex: 1;
  width: 100%;
  padding: 20px 24px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  resize: none;
  outline: none;
  overflow-y: auto;
  tab-size: 2;
}

.editor-textarea::placeholder {
  color: var(--text-tertiary);
}

.editor-textarea::-webkit-scrollbar {
  width: 6px;
}

.editor-textarea::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.preview-pane {
  overflow-y: auto;
  padding: 20px 28px;
}

.preview-pane::-webkit-scrollbar {
  width: 6px;
}

.preview-pane::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* ===== Markdown Preview (Prose) ===== */
.markdown-preview {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-primary);
}

.markdown-preview .preview-empty {
  color: var(--text-tertiary);
  font-style: italic;
}

.markdown-preview h1 {
  font-size: 2em;
  font-weight: 800;
  margin: 1em 0 0.5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.5px;
}

.markdown-preview h2 {
  font-size: 1.5em;
  font-weight: 700;
  margin: 0.8em 0 0.4em;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--border-light);
  letter-spacing: -0.3px;
}

.markdown-preview h3 {
  font-size: 1.25em;
  font-weight: 600;
  margin: 0.7em 0 0.3em;
}

.markdown-preview p {
  margin: 0.6em 0;
}

.markdown-preview strong {
  font-weight: 700;
  color: var(--text-primary);
}

.markdown-preview em {
  font-style: italic;
}

.markdown-preview del {
  text-decoration: line-through;
  color: var(--text-secondary);
}

.markdown-preview ul, .markdown-preview ol {
  margin: 0.5em 0;
  padding-left: 1.8em;
}

.markdown-preview li {
  margin: 0.25em 0;
}

.markdown-preview code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--accent);
}

.markdown-preview pre {
  margin: 1em 0;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

.markdown-preview pre code {
  padding: 0;
  background: transparent;
  color: var(--text-primary);
  font-size: 13px;
  line-height: 1.6;
}

.markdown-preview blockquote {
  margin: 0.8em 0;
  padding: 8px 16px;
  border-left: 4px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.markdown-preview blockquote p {
  margin: 0.2em 0;
}

.markdown-preview hr {
  margin: 1.5em 0;
  border: none;
  border-top: 2px solid var(--border-color);
}

.markdown-preview a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.markdown-preview a:hover {
  border-bottom-color: var(--accent);
}

.markdown-preview img {
  max-width: 100%;
  border-radius: var(--radius);
}

.markdown-preview table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}

.markdown-preview th, .markdown-preview td {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.markdown-preview th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    width: 260px;
    min-width: 260px;
  }

  .sidebar-collapsed {
    width: 48px;
    min-width: 48px;
  }

  .editor-body.split {
    flex-direction: column;
  }

  .editor-body.split .editor-pane,
  .editor-body.split .preview-pane {
    width: 100%;
  }

  .editor-body.split .editor-pane {
    height: 50%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .editor-body.split .preview-pane {
    height: 50%;
  }

  .editor-header {
    padding: 10px 14px;
  }

  .editor-title-input {
    font-size: 17px;
  }

  .editor-textarea {
    padding: 14px 16px;
  }

  .preview-pane {
    padding: 14px 16px;
  }
}

@media (max-width: 480px) {
  .sidebar {
    position: fixed;
    z-index: 100;
    width: 100%;
    min-width: 100%;
    box-shadow: var(--shadow-lg);
  }

  .sidebar-collapsed {
    width: 48px;
    min-width: 48px;
  }
}

/* ===== Accessibility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip to content for a11y */
.skip-to-content {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-to-content:focus {
  top: 16px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  .sidebar, .toolbar, .theme-toggle-wrapper, .view-mode-buttons {
    display: none !important;
  }
  .main-content {
    margin: 0;
    padding: 0;
  }
  .editor-body {
    display: block;
  }
  .preview-pane {
    width: 100% !important;
    padding: 0 !important;
  }
}