:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --panel: #ffffff;
  --border: #dcdce0;
  --text: #1b1f24;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --chip-bg: #e8edf7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --panel: #1f232a;
    --border: #33373f;
    --text: #f2f2f3;
    --muted: #9aa0aa;
    --chip-bg: #2a3040;
  }
}

:root[data-theme="dark"] {
  --bg: #16181d;
  --panel: #1f232a;
  --border: #33373f;
  --text: #f2f2f3;
  --muted: #9aa0aa;
  --chip-bg: #2a3040;
}

:root[data-theme="light"] {
  --bg: #f5f5f7;
  --panel: #ffffff;
  --border: #dcdce0;
  --text: #1b1f24;
  --muted: #6b7280;
  --chip-bg: #e8edf7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

.muted { color: var(--muted); }

.screen { height: 100vh; }

#signin-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}

.signin-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem 3rem;
  text-align: center;
}

.signin-card h1 { margin-top: 0; }

.error { color: var(--danger); font-size: 0.9rem; }

#app-screen {
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: calc(0.75rem + env(safe-area-inset-top)) 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.topbar h1 { font-size: 1.1rem; margin: 0; flex-shrink: 0; }

.search-input {
  flex: 1;
  max-width: 320px;
  font: inherit;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.sync-status {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
}

.sync-status.offline { color: var(--danger); }

.topbar-actions { display: flex; gap: 0.5rem; margin-left: auto; }

button {
  font: inherit;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

button:hover { border-color: var(--accent); }

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

button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.icon-btn { padding: 0.5rem 0.6rem; }

.layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow-y: auto;
}

.tag-filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.tag-filter-item {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--text);
  cursor: pointer;
}

.tag-filter-item.active { background: var(--accent); color: #fff; }

.note-list { flex: 1; }

.note-item {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

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

.note-item.active { background: var(--bg); border-left: 3px solid var(--accent); }

.note-item .title { font-weight: 600; margin-bottom: 0.2rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.note-item .snippet { font-size: 0.85rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.note-item .empty-title { color: var(--muted); font-style: italic; }

.editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 1.5rem;
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
}

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

#note-title {
  flex: 1;
  font: inherit;
  font-size: 1.3rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text);
  padding: 0.4rem 0;
  outline: none;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.5rem;
}

.toolbar button {
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
}

.note-body {
  flex: 1;
  overflow-y: auto;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.5;
  outline: none;
  padding: 0.4rem 0;
}

.note-body:empty::before {
  content: attr(data-placeholder);
  color: var(--muted);
}

.note-body h1 { font-size: 1.5rem; margin: 0.5rem 0; }
.note-body h2 { font-size: 1.2rem; margin: 0.5rem 0; }
.note-body ul, .note-body ol { padding-left: 1.5rem; }
.note-body a { color: var(--accent); }

.tags-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--border);
}

.tag-chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--chip-bg);
}

.tag-chip button {
  border: none;
  background: none;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1;
  color: var(--muted);
}

.tag-input {
  font: inherit;
  font-size: 0.85rem;
  border: none;
  background: transparent;
  color: var(--text);
  outline: none;
  width: 80px;
}

.editor-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
}

.save-status { color: var(--muted); font-size: 0.85rem; }

.trash-view {
  flex: 1;
  padding: 1rem 1.5rem;
  overflow-y: auto;
}

.trash-header h2 { margin: 0 0 0.2rem; }

.trash-list { margin-top: 1rem; display: flex; flex-direction: column; gap: 0.6rem; }

.trash-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
}

.trash-item-info { min-width: 0; }

.trash-item-info .title { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.trash-item-info .snippet { font-size: 0.85rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.trash-item-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

@media (max-width: 700px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; max-height: 40vh; border-right: none; border-bottom: 1px solid var(--border); }
  .topbar { flex-wrap: wrap; }
  .search-input { max-width: none; order: 3; flex-basis: 100%; }
}