@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Fira+Code:wght@400;500&display=swap');

:root {
  --bg-dark: #0f1117;
  --surface-dark: #1a1b26;
  --surface-hover: #24283b;
  --accent: #7aa2f7;
  --accent-muted: rgba(122, 162, 247, 0.2);
  --text-primary: #a9b1d6;
  --text-muted: #565f89;
  --text-bright: #c0caf5;
  --border: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(255, 255, 255, 0.02);
  --glass-border: rgba(255, 255, 255, 0.1);
  --sidebar-width: 280px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background: var(--surface-dark);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition);
  z-index: 100;
  flex-shrink: 0;
}

.sidebar.collapsed {
  transform: translateX(-100%);
  margin-right: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-bright);
}

.search-container {
  padding: 1rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-bright);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
}

.note-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.note-item {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

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

.note-item.active {
  background: var(--accent-muted);
  border-color: var(--accent);
}

.note-item h3 {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-bright);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.note-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Workspace */
.workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.workspace-header {
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(15, 17, 23, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.workspace-header input#note-title-input {
  background: transparent;
  border: none;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-bright);
  outline: none;
  width: 100%;
  letter-spacing: -0.5px;
}

.metadata {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.tag-container {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--glass-bg);
  padding: 0.1rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--glass-border);
}

.tag-container i {
  width: 10px;
  height: 10px;
}

.tag-container input {
  background: transparent;
  border: none;
  font-size: 0.7rem;
  color: var(--accent);
  outline: none;
  width: 100px;
  font-weight: 500;
}

.tag-container input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.tag-container:focus-within {
  border-color: var(--accent);
  background: rgba(122, 162, 247, 0.05);
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-bright);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: 0.2s;
  white-space: nowrap;
}

.btn:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
  font-weight: 600;
}

.pane-container {
  flex: 1;
  display: flex;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.pane {
  height: 100%;
  position: relative;
  overflow: hidden;
}

.pane-header {
  padding: 0.5rem 1rem;
  background: var(--glass-bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
  font-weight: 600;
  color: #309100;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.editor-pane {
  flex: 50;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.style-ribbon {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: var(--glass-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(5px);
}

.ribbon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.15rem;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ribbon-btn:hover {
  color: var(--accent);
  background: var(--accent-muted);
  border-color: var(--glass-border);
}

.ribbon-btn i {
  width: 14px;
  height: 14px;
}

.ribbon-divider {
  width: 1px;
  height: 14px;
  background: var(--border);
  margin: 0 0.15rem;
}

.preview-pane {
  flex: 50;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
}

#preview-container {
  flex: 1;
  padding: 3rem;
  overflow-y: auto;
  padding-top: 28px;
}

.gutter {
  width: 4px;
  background: transparent;
  cursor: col-resize;
  transition: background 0.3s;
  z-index: 10;
}

.gutter:hover {
  background: var(--accent);
}

/* Markdown Styling */
#preview-container h1,
#preview-container h2,
#preview-container h3 {
  color: var(--text-bright);
  margin: 1.5rem 0 1rem;
}

#preview-container pre {
  background: #16161e;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 1rem 0;
  position: relative;
  overflow-x: auto;
}

#preview-container code {
  font-family: 'Fira Code', monospace;
}

#preview-container p {
  margin-bottom: 1rem;
  line-height: 1.7;
}

#preview-container a {
  color: var(--accent);
  text-decoration: none;
  transition: all 0.2s ease;
  border-bottom: 1px solid transparent;
}

#preview-container a:hover {
  color: var(--text-bright);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal {
  background: var(--surface-dark);
  padding: 2.5rem;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  max-width: 400px;
  text-align: center;
}

.modal h2 {
  margin-bottom: 1rem;
}

.modal p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.modal-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--surface-hover);
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
  z-index: 10;
}

.copy-btn:hover {
  background: var(--accent);
  color: var(--bg-dark);
}

#note-font-size-picker {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--surface-dark);
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  color: var(--text-bright);
  padding: 0.25rem;
  font-size: 0.8rem;
  z-index: 500;
  margin-top: 0.5rem;
  outline: none;
}

#note-font-size-picker option {
  background: var(--surface-dark);
  color: var(--text-bright);
}

::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}