:root {
  --bg: #f2f2f7;
  --window: #ffffff;
  --sidebar: #f7f7f8;
  --border: #dddddf;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --muted2: #9a9aa0;
  --active: #ffe8a3;
  --hover: #eeeeef;
  --primary: #ffcc00;
  --primary-dark: #bf8f00;
  --danger: #ff3b30;
  --success: #34c759;
  --shadow: rgba(0, 0, 0, 0.10);
  --shadow-strong: rgba(0, 0, 0, 0.25);
  --input: #ffffff;
  --overlay: rgba(0, 0, 0, 0.35);
}

body.dark {
  --bg: #1c1c1e;
  --window: #2c2c2e;
  --sidebar: #242426;
  --border: #3a3a3c;
  --text: #f5f5f7;
  --muted: #c7c7cc;
  --muted2: #8e8e93;
  --active: #5a4515;
  --hover: #363638;
  --primary: #ffd60a;
  --primary-dark: #c9a20a;
  --danger: #ff453a;
  --success: #30d158;
  --shadow: rgba(0, 0, 0, 0.35);
  --shadow-strong: rgba(0, 0, 0, 0.6);
  --input: #2c2c2e;
  --overlay: rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  padding: 24px;
  transition: background .2s ease, color .2s ease;
}

.app {
  display: grid;
  grid-template-columns: 290px 330px 1fr;
  width: min(1420px, 100%);
  height: calc(100vh - 48px);
  margin: 0 auto;
  background: var(--window);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: 0 12px 38px var(--shadow);
  overflow: hidden;
}

.folders, .notes-panel {
  background: var(--sidebar);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.toolbar {
  padding: 16px;
  display: flex;
  gap: 8px;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.toolbar h2 {
  font-size: 20px;
  margin: 0;
  flex: 1;
}

button, .file-label {
  border: 0;
  border-radius: 11px;
  background: var(--primary);
  color: #241b00;
  cursor: pointer;
  padding: 9px 12px;
  font-weight: 700;
  font-size: 14px;
  transition: transform .12s ease, opacity .12s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover:not(:disabled), .file-label:hover { opacity: .86; }
button:active:not(:disabled), .file-label:active { transform: scale(.98); }
button:disabled { opacity: .5; cursor: not-allowed; }

button.secondary, .file-label.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
button.danger { background: transparent; color: var(--danger); border: 1px solid var(--border); }
button.icon-btn {
  padding: 6px 8px;
  font-size: 13px;
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
}
button.icon-btn:hover { background: var(--hover); color: var(--text); }

.search-box {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 8px;
}

input, textarea, select {
  font: inherit;
  color: var(--text);
  background: var(--input);
}

.search-box input, .folder-input, .tag-input, .note-title, .filter-select {
  width: 100%;
  border: 1px solid var(--border);
  outline: 0;
  border-radius: 12px;
  padding: 11px 13px;
}

.filter-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.filter-chip {
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 500;
}
.filter-chip.active {
  background: var(--primary);
  color: #241b00;
  border-color: var(--primary-dark);
}

.folder-list, .note-list {
  overflow: auto;
  padding: 10px;
  flex: 1;
}

.folder-item, .note-card {
  border-radius: 14px;
  padding: 12px;
  cursor: pointer;
  margin-bottom: 6px;
  position: relative;
}

.folder-item {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
}

.folder-item.active, .note-card.active { background: var(--active); }
.folder-item:hover, .note-card:hover { background: var(--hover); }

.folder-item .folder-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 700;
}

.folder-count {
  color: var(--muted2);
  font-size: 12px;
  margin-left: 4px;
}

.folder-controls {
  display: none;
  gap: 4px;
  margin-left: 4px;
}
.folder-item:hover .folder-controls,
.folder-item:focus-within .folder-controls,
.folder-item.active .folder-controls { display: inline-flex; }

.folder-item.system .folder-controls { display: none !important; }

.folder-actions {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  display: grid;
  gap: 8px;
}

.folder-actions .row {
  display: flex;
  gap: 6px;
}
.folder-actions .row .folder-input { flex: 1; }

.note-card h3 {
  font-size: 16px;
  margin: 0 0 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-card p {
  font-size: 13px;
  margin: 0 0 6px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-card small {
  color: var(--muted2);
  font-size: 11px;
}

.pin {
  position: absolute;
  left: 12px;
  top: 12px;
  color: var(--primary-dark);
}

.editor {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--window);
}

.editor-top {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.editor-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
  min-height: 0;
}

.editorBody {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
}

.ai-summary {
  margin: 0 22px 22px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--sidebar);
  color: var(--text);
  line-height: 1.7;
  white-space: pre-wrap;
}

.ai-summary[hidden] { display: none; }

.ai-summary strong {
  display: block;
  margin-bottom: 6px;
}

.note-title {
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  font-size: 30px;
  font-weight: 800;
  padding: 10px 0 12px;
}

.note-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-input, .folder-select {
  max-width: 220px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
}

.note-body {
  flex: 1;
  min-height: 260px;
  border: 0;
  outline: 0;
  resize: none;
  line-height: 1.8;
  font-size: 17px;
  background: transparent;
  color: var(--text);
}

.empty {
  height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  padding: 24px;
  font-size: 18px;
}

input[type=file] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.file-label:focus-within {
  outline: 3px solid var(--primary-dark);
  outline-offset: 2px;
}

.sync-panel {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  font-size: 12px;
  color: var(--muted);
}

.sync-panel code {
  direction: ltr;
  unicode-bidi: plaintext;
}

/* Backup banner */
.backup-banner {
  padding: 10px 14px;
  background: #fff4c2;
  color: #6b4d00;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
}
body.dark .backup-banner { background: #4d3f10; color: #ffe58a; }
.backup-banner button { padding: 4px 10px; font-size: 12px; }
.backup-banner .close { margin-left: auto; background: transparent; color: inherit; border: 0; }

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: var(--text);
  color: var(--window);
  padding: 12px 18px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 8px 24px var(--shadow-strong);
  pointer-events: auto;
  max-width: 90vw;
  animation: toast-in .2s ease;
  font-size: 14px;
}

@keyframes toast-in {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.toast.leaving { animation: toast-out .18s ease forwards; }
@keyframes toast-out {
  to { transform: translateY(20px); opacity: 0; }
}

.toast .toast-action {
  background: var(--primary);
  color: #241b00;
  padding: 6px 12px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  border: 0;
  font-size: 13px;
}
.toast.success { border-right: 4px solid var(--success); }
.toast.error { border-right: 4px solid var(--danger); }

/* Modal dialog */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: grid;
  place-items: center;
  z-index: 10000;
  padding: 20px;
  animation: fade-in .15s ease;
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--window);
  color: var(--text);
  border-radius: 16px;
  padding: 22px;
  width: min(420px, 100%);
  box-shadow: 0 20px 60px var(--shadow-strong);
  border: 1px solid var(--border);
}

.modal h3 { margin: 0 0 12px; font-size: 18px; }
.modal p { margin: 0 0 16px; color: var(--muted); font-size: 14px; line-height: 1.6; }
.modal input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 11px 13px;
  outline: 0;
  margin-bottom: 16px;
}
.modal input:focus { border-color: var(--primary-dark); }
.modal .modal-buttons {
  display: flex;
  gap: 8px;
  justify-content: flex-start;
  flex-direction: row-reverse;
}
.modal .modal-buttons button { min-width: 90px; justify-content: center; }

/* Trash panel */
.trash-panel {
  border-top: 1px solid var(--border);
  padding: 10px 16px;
}
.trash-panel button {
  width: 100%;
  background: transparent;
  color: var(--muted);
  border: 1px dashed var(--border);
  padding: 8px;
  font-size: 12px;
  justify-content: center;
}
.trash-panel button:hover { color: var(--text); background: var(--hover); }
.trash-panel .count { color: var(--primary-dark); font-weight: 700; }

.trash-list .note-card {
  opacity: .8;
  border: 1px dashed var(--border);
}
.trash-list .trash-controls {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}
.trash-list .trash-controls button {
  padding: 4px 8px;
  font-size: 12px;
}

@media (max-width: 980px) {
  body { padding: 0; }
  .app {
    height: 100vh;
    border-radius: 0;
    grid-template-columns: 1fr;
  }
  .folders, .notes-panel, .editor {
    display: none;
    border-left: 0;
  }
  .app[data-mobile-view="folders"] .folders,
  .app[data-mobile-view="notes"] .notes-panel,
  .app[data-mobile-view="editor"] .editor {
    display: flex;
  }
  .mobile-only { display: inline-flex !important; }
  .folder-controls { display: inline-flex !important; }
}

@media (min-width: 981px) {
  .mobile-only { display: none !important; }
}