:root {
  --bg: #1e1e1e;
  --surface: #252526;
  --border: #3c3c3c;
  --text: #d4d4d4;
  --muted: #858585;
  --accent: #569cd6;
  --danger: #f14c4c;
  --font: "Segoe UI", system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  display: grid;
  min-height: calc(100vh - 1px);
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .app {
    grid-template-columns: 260px 1fr;
  }
}

.sidebar {
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  max-height: 40vh;
}

@media (min-width: 720px) {
  .sidebar {
    border-bottom: none;
    border-right: 1px solid var(--border);
    max-height: none;
    min-height: 100vh;
  }
}

.sidebar-head {
  padding: 1rem 1rem 0.75rem;
  flex-shrink: 0;
}

.sidebar-head h1 {
  margin: 0 0 0.65rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.note-list {
  list-style: none;
  margin: 0;
  padding: 0 0.5rem;
  overflow-y: auto;
  flex: 1;
}

.note-row {
  width: 100%;
  text-align: left;
  padding: 0.55rem 0.65rem;
  margin-bottom: 0.25rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font: inherit;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.note-row:hover {
  background: rgba(255, 255, 255, 0.05);
}

.note-row.active {
  border-color: var(--accent);
  background: rgba(86, 156, 214, 0.08);
}

.note-row-title {
  font-weight: 600;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.note-row-date {
  font-size: 0.75rem;
  color: var(--muted);
}

.sidebar-foot {
  padding: 0.5rem;
  flex-shrink: 0;
  border-top: 1px solid var(--border);
}

.editor-panel {
  display: flex;
  flex-direction: column;
  min-height: 50vh;
}

@media (min-width: 720px) {
  .editor-panel {
    min-height: 100vh;
  }
}

.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  padding: 2rem;
}

.editor-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.toolbar {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.title-input {
  flex: 1;
  min-width: 10rem;
  padding: 0.45rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 1.05rem;
  font-weight: 600;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.tabs {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.tab {
  padding: 0.35rem 0.65rem;
  border: none;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  cursor: pointer;
}

.tab.active {
  color: var(--accent);
  background: rgba(86, 156, 214, 0.12);
}

.note-body {
  flex: 1;
  min-height: 12rem;
  margin: 0;
  padding: 1rem;
  border: none;
  resize: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.55;
  background: var(--bg);
  color: var(--text);
}

.note-body:focus {
  outline: none;
  box-shadow: inset 0 0 0 1px var(--accent);
}

.note-preview {
  flex: 1;
  min-height: 12rem;
  padding: 1rem 1.25rem;
  overflow-y: auto;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.note-preview h1,
.note-preview h2,
.note-preview h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.note-preview h1:first-child,
.note-preview h2:first-child,
.note-preview h3:first-child {
  margin-top: 0;
}

.note-preview pre {
  padding: 0.75rem;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  overflow-x: auto;
  font-size: 0.85rem;
}

.note-preview code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.note-preview p {
  margin: 0.65rem 0;
}

.note-preview ul,
.note-preview ol {
  margin: 0.5rem 0;
  padding-left: 1.35rem;
}

.note-preview a {
  color: var(--accent);
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 4px;
}

.btn-primary {
  width: 100%;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--accent);
  background: rgba(86, 156, 214, 0.15);
  color: var(--accent);
}

.btn-primary:hover {
  background: rgba(86, 156, 214, 0.25);
}

.btn-ghost {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.65rem;
}

.btn-ghost:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.btn-ghost.danger:hover {
  color: var(--danger);
  border-color: rgba(241, 76, 76, 0.45);
}

.btn-sm {
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
}

.full-width {
  width: 100%;
}

.footer {
  padding: 1rem 1.25rem max(1.25rem, env(safe-area-inset-bottom));
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.footer p {
  margin: 0 0 0.5rem;
  max-width: 52rem;
}

.footer-donate {
  padding-top: 0.5rem;
  margin-top: 0.35rem;
  border-top: 1px solid var(--border);
  text-align: center;
  max-width: none;
}

.donate-link {
  display: inline-block;
  padding: 0.45rem 1rem;
  border-radius: 4px;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.donate-link:hover {
  background: rgba(86, 156, 214, 0.12);
}