/* ===== DESIGN TOKENS ===== */
:root {
  --safe-top: max(env(safe-area-inset-top), 54px);
  --safe-bottom: max(env(safe-area-inset-bottom), 16px);
  --safe-left: env(safe-area-inset-left);
  --safe-right: env(safe-area-inset-right);

  /* Light mode */
  --bg: #fafaf9;
  --bg-2: #f0ede8;
  --bg-3: #e4e0da;
  --fg: #1a1814;
  --fg-2: #4a4640;
  --fg-3: #8a8480;
  --accent: #2a2420;
  --accent-soft: rgba(42,36,32,0.08);
  --blue: #4a90d9;
  --blue-soft: rgba(74,144,217,0.15);
  --red: #c0392b;
  --green: #27ae60;
  --border: rgba(0,0,0,0.08);
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.15);
  --radius: 18px;
  --radius-sm: 10px;
  --font-body: 'Georgia', 'Times New Roman', serif;
  --font-ui: -apple-system, 'SF Pro Display', 'Helvetica Neue', sans-serif;
  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

[data-theme="dark"] {
  --bg: #0f0e0d;
  --bg-2: #1a1918;
  --bg-3: #252320;
  --fg: #f0ede8;
  --fg-2: #c0bdb8;
  --fg-3: #706d68;
  --accent: #f0ede8;
  --accent-soft: rgba(240,237,232,0.08);
  --border: rgba(255,255,255,0.07);
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.6);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

button { cursor: pointer; border: none; background: none; color: inherit; font-family: inherit; }
input, textarea, select { font-family: inherit; color: inherit; }

/* ===== PWA OVERLAY ===== */
.pwa-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  animation: fadeIn 0.5s ease;
}

.pwa-overlay.hidden { display: none; }

.pwa-overlay-card {
  max-width: 360px; width: 100%;
  background: var(--bg-2);
  border-radius: 28px;
  padding: 40px 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  text-align: center;
  animation: slideUp 0.5s var(--spring);
}

.pwa-icon { font-size: 48px; margin-bottom: 16px; animation: bounce 2s infinite; }

@keyframes bounce {
  0%,100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.pwa-overlay-card h2 {
  font-size: 22px; font-weight: 600; margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.pwa-overlay-card > p {
  color: var(--fg-3); font-size: 14px; margin-bottom: 28px;
}

.pwa-steps { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }

.step {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-3); border-radius: var(--radius-sm);
  padding: 12px 14px; text-align: left;
  font-size: 14px; color: var(--fg-2);
}

.step-num {
  width: 24px; height: 24px;
  background: var(--accent); color: var(--bg);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}

.share-icon { font-size: 16px; }
.pwa-note { font-size: 12px; color: var(--fg-3); }

/* ===== APP SHELL ===== */
.app {
  position: fixed; inset: 0;
  overflow: hidden;
}

/* ===== SCREENS ===== */
.screen {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  background: var(--bg);
  transform: translateX(100%);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
  pointer-events: none;
  overflow: hidden;
}

.screen.active {
  transform: translateX(0);
  opacity: 1;
  pointer-events: all;
}

.screen.slide-out {
  transform: translateX(-30%);
  opacity: 0;
}

/* ===== TOP BAR (HOME) ===== */
.top-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--safe-top) 20px 8px;
  position: relative; z-index: 10;
}

.top-bar-spacer { width: 44px; }

.theme-btn {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  transition: background var(--transition), transform var(--transition);
  font-size: 18px;
}

.theme-btn:active { transform: scale(0.9); }

/* ===== HOME MAIN ===== */
.home-main {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 0 24px;
  gap: 8px;
}

.logo {
  font-family: var(--font-body);
  font-size: 52px; font-weight: 400;
  letter-spacing: -2px;
  color: var(--fg);
  animation: fadeSlideDown 0.8s var(--spring);
}

.tagline {
  color: var(--fg-3); font-size: 13px;
  letter-spacing: 0.5px;
  margin-bottom: 32px;
  animation: fadeSlideDown 0.8s var(--spring) 0.1s both;
}

.menu-stack {
  width: 100%; max-width: 320px;
  display: flex; flex-direction: column; gap: 10px;
  animation: fadeSlideUp 0.8s var(--spring) 0.2s both;
}

.menu-item { width: 100%; }

.menu-btn {
  width: 100%;
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px; font-weight: 500;
  color: var(--fg);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.menu-btn::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--accent-soft);
  opacity: 0;
  transition: opacity var(--transition);
}

.menu-btn:active::before { opacity: 1; }
.menu-btn:active { transform: scale(0.98); }

.menu-btn-icon { font-size: 16px; color: var(--fg-3); }
.menu-btn span:nth-child(2) { flex: 1; text-align: left; }

.menu-btn-arrow {
  font-size: 18px; color: var(--fg-3);
  transition: transform var(--transition);
}

.menu-btn.expanded .menu-btn-arrow { transform: rotate(90deg); }

/* ===== PINNED EXPAND ===== */
.pinned-expand, .create-expand {
  max-height: 0; overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  margin-top: -4px;
}

.pinned-expand.open, .create-expand.open {
  max-height: 300px;
}

.pinned-label {
  padding: 10px 20px 6px;
  font-size: 11px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 1px;
}

.pinned-list { padding: 0 12px 12px; display: flex; flex-direction: column; gap: 4px; }

.pinned-cat-btn {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: var(--bg-3); border-radius: var(--radius-sm);
  font-size: 14px; color: var(--fg-2);
  transition: background var(--transition), transform var(--transition);
  text-align: left; width: 100%;
}

.pinned-cat-btn:active { transform: scale(0.97); background: var(--accent-soft); }

.empty-pinned {
  padding: 10px 12px;
  font-size: 13px; color: var(--fg-3);
  font-style: italic;
}

.create-expand { padding: 8px 12px 12px; display: flex; gap: 8px; }

.create-opt {
  flex: 1; padding: 14px 8px;
  background: var(--bg-3); border-radius: var(--radius-sm);
  font-size: 14px; color: var(--fg);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  transition: background var(--transition), transform var(--transition);
  border: 1px solid var(--border);
}

.create-opt span { font-size: 22px; }
.create-opt:active { transform: scale(0.95); background: var(--accent-soft); }

/* ===== FOOTER ===== */
.home-footer {
  padding: 16px 24px var(--safe-bottom);
  text-align: center;
  font-size: 12px; color: var(--fg-3);
  animation: fadeIn 1s ease 0.5s both;
}

.credit { color: var(--fg-2); font-style: italic; }

/* ===== SCREEN HEADER ===== */
.screen-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--safe-top) 16px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.screen-header h2 {
  font-size: 17px; font-weight: 600; letter-spacing: -0.3px;
}

.back-btn {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: var(--blue);
  border-radius: 50%;
  transition: background var(--transition), transform var(--transition);
}

.back-btn:active { background: var(--accent-soft); transform: scale(0.9); }

.icon-btn {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: var(--blue);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.icon-btn:active { background: var(--accent-soft); }

/* ===== LIST VIEWS ===== */
.list-view {
  flex: 1; overflow-y: auto;
  padding: 12px 16px;
  display: flex; flex-direction: column; gap: 8px;
  -webkit-overflow-scrolling: touch;
}

.list-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition);
  animation: fadeSlideUp 0.3s var(--spring) both;
}

.list-card:active { transform: scale(0.98); background: var(--bg-3); }

.list-card h3 { font-size: 16px; font-weight: 500; margin-bottom: 4px; }
.list-card p { font-size: 13px; color: var(--fg-3); }
.list-card .card-meta {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--fg-3); margin-top: 8px;
}

/* ===== TEXT EDITOR ===== */
.editor-header { gap: 8px; }

.note-title-input {
  flex: 1; background: none; border: none; outline: none;
  font-size: 17px; font-weight: 600; letter-spacing: -0.3px;
  color: var(--fg);
}

.note-title-input::placeholder { color: var(--fg-3); }

.editor-actions { display: flex; align-items: center; gap: 4px; }

.autosave-indicator {
  font-size: 10px; color: var(--green);
  animation: pulse 2s infinite;
}

.autosave-indicator.saving { color: var(--blue); }
.autosave-indicator.off { color: var(--fg-3); animation: none; }

@keyframes pulse {
  0%,100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.toolbar {
  display: flex; align-items: center; gap: 2px;
  padding: 8px 12px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-wrap: nowrap;
}

.toolbar::-webkit-scrollbar { display: none; }

.tb-btn {
  min-width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  font-size: 14px; color: var(--fg-2);
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
  padding: 0 6px;
}

.tb-btn:active, .tb-btn.active { background: var(--accent-soft); color: var(--fg); }

.tb-divider {
  width: 1px; height: 24px;
  background: var(--border);
  margin: 0 4px; flex-shrink: 0;
}

.tb-select {
  height: 32px; padding: 0 6px;
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: 8px; font-size: 12px;
  color: var(--fg); outline: none;
  flex-shrink: 0;
}

.tb-color {
  width: 32px; height: 32px;
  border: none; border-radius: 8px;
  padding: 2px; cursor: pointer;
  background: var(--bg-3);
  flex-shrink: 0;
}

.text-editor {
  flex: 1; overflow-y: auto;
  padding: 20px 24px;
  font-family: var(--font-body);
  font-size: 17px; line-height: 1.7;
  color: var(--fg);
  outline: none;
  -webkit-overflow-scrolling: touch;
  user-select: text;
  -webkit-user-select: text;
}

.text-editor:empty::before {
  content: 'start writing...';
  color: var(--fg-3);
  pointer-events: none;
}

.autosave-bar {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px calc(var(--safe-bottom) + 10px);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  font-size: 12px; color: var(--fg-3);
}

.autosave-toggle { display: flex; align-items: center; gap: 6px; }
.autosave-toggle input[type="checkbox"] { accent-color: var(--accent); }

.autosave-interval-select {
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: 6px; padding: 2px 6px; font-size: 12px;
  color: var(--fg); outline: none;
}

.last-saved { margin-left: auto; color: var(--fg-3); font-size: 11px; }

/* ===== NOTE SETTINGS PANEL ===== */
.side-panel {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex; justify-content: flex-end;
  animation: fadeIn 0.2s ease;
}

.side-panel.hidden { display: none; }

.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--safe-top) 16px 12px;
  border-bottom: 1px solid var(--border);
}

.panel-header h3 { font-size: 15px; font-weight: 600; }

.panel-body {
  padding: 20px 16px;
  display: flex; flex-direction: column; gap: 12px;
  flex: 1;
}

.panel-body label { font-size: 12px; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.5px; }

.panel-input {
  width: 100%; padding: 12px 14px;
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 15px; outline: none;
  color: var(--fg);
}

.panel-danger { margin-top: auto; }

.danger-btn {
  width: 100%; padding: 14px;
  background: rgba(192,57,43,0.1); color: var(--red);
  border: 1px solid rgba(192,57,43,0.2);
  border-radius: var(--radius-sm); font-size: 15px;
  transition: background var(--transition);
}

.danger-btn:active { background: rgba(192,57,43,0.2); }

.side-panel > div:last-child {
  width: 85%; max-width: 320px;
  background: var(--bg);
  display: flex; flex-direction: column;
  animation: slideFromRight 0.3s var(--spring);
}

@keyframes slideFromRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* ===== CANVAS EDITOR ===== */
.canvas-toolbar {
  display: flex; align-items: center; gap: 2px;
  padding: 8px 12px;
  background: var(--bg-2); border-bottom: 1px solid var(--border);
  overflow-x: auto; flex-shrink: 0;
  -webkit-overflow-scrolling: touch;
}

.canvas-toolbar::-webkit-scrollbar { display: none; }

.canvas-wrapper {
  flex: 1; position: relative; overflow: hidden;
  background: #fff;
  touch-action: none;
}

[data-theme="dark"] .canvas-wrapper { background: #1a1a1a; }

#drawing-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  cursor: crosshair;
  touch-action: none;
}

.text-overlay {
  position: absolute; inset: 0;
  pointer-events: none;
}

.canvas-textbox {
  position: absolute;
  background: transparent;
  border: 1.5px dashed var(--blue);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 16px;
  outline: none;
  min-width: 80px; min-height: 32px;
  resize: both;
  pointer-events: all;
  color: var(--fg);
  cursor: text;
}

/* ===== CALENDAR ===== */
.calendar-container {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.cal-nav {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}

.cal-month-label {
  font-size: 17px; font-weight: 600; letter-spacing: -0.3px;
}

.cal-nav-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-size: 20px; color: var(--blue);
  background: var(--accent-soft);
  transition: background var(--transition), transform var(--transition);
}

.cal-nav-btn:active { transform: scale(0.9); }

.cal-grid-header {
  display: grid; grid-template-columns: repeat(7, 1fr);
  gap: 4px; margin-bottom: 8px;
  text-align: center;
}

.cal-grid-header span {
  font-size: 11px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.5px;
  padding: 4px 0;
}

.cal-grid {
  display: grid; grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.cal-day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-size: 14px;
  cursor: pointer; position: relative;
  transition: background var(--transition), transform var(--transition);
}

.cal-day:active { transform: scale(0.9); }
.cal-day.empty { pointer-events: none; }
.cal-day.other-month { color: var(--fg-3); }
.cal-day.today { background: var(--blue-soft); color: var(--blue); font-weight: 700; }
.cal-day.has-reminder::after {
  content: '';
  position: absolute; bottom: 4px;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--blue);
}
.cal-day.selected { background: var(--accent); color: var(--bg); }
.cal-day.selected.today { background: var(--blue); }

.day-reminders {
  flex: 1; overflow-y: auto;
  padding: 16px;
  -webkit-overflow-scrolling: touch;
}

.day-reminders.hidden { display: none; }

.day-reminders-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}

.day-reminders-header h3 { font-size: 15px; font-weight: 600; }

.add-btn {
  padding: 8px 14px;
  background: var(--blue); color: #fff;
  border-radius: var(--radius-sm); font-size: 13px;
  transition: opacity var(--transition), transform var(--transition);
}

.add-btn:active { opacity: 0.8; transform: scale(0.96); }

.reminders-list { display: flex; flex-direction: column; gap: 8px; }

.reminder-item {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--bg-2); border-radius: var(--radius-sm);
  padding: 12px 14px;
  border: 1px solid var(--border);
  animation: fadeSlideUp 0.3s var(--spring);
}

.reminder-time {
  font-size: 12px; color: var(--blue); font-weight: 600;
  min-width: 40px;
}

.reminder-text-content { flex: 1; font-size: 14px; color: var(--fg-2); }

.reminder-delete {
  color: var(--fg-3); font-size: 16px;
  padding: 0 4px;
  transition: color var(--transition);
}

.reminder-delete:active { color: var(--red); }

/* ===== REMINDER MODAL ===== */
.modal {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  animation: fadeIn 0.2s ease;
}

.modal.hidden { display: none; }

.modal-card {
  width: 100%; max-width: 340px;
  background: var(--bg);
  border-radius: 24px;
  padding: 28px 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s var(--spring);
  display: flex; flex-direction: column; gap: 14px;
}

.modal-card h3 { font-size: 18px; font-weight: 600; }

.modal-textarea {
  width: 100%; height: 100px;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 12px 14px;
  font-size: 15px; resize: none; outline: none;
  color: var(--fg);
}

.modal-input {
  width: 100%; padding: 12px 14px;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); font-size: 15px; outline: none;
  color: var(--fg);
}

.modal-actions { display: flex; gap: 8px; }

.modal-btn {
  flex: 1; padding: 14px;
  border-radius: var(--radius-sm); font-size: 15px; font-weight: 500;
  transition: opacity var(--transition), transform var(--transition);
}

.modal-btn:active { opacity: 0.8; transform: scale(0.97); }
.modal-btn.primary { background: var(--fg); color: var(--bg); }
.modal-btn.secondary { background: var(--bg-2); color: var(--fg-2); border: 1px solid var(--border); }

/* ===== NOTE VIEW ===== */
.note-view-content {
  flex: 1; overflow-y: auto;
  padding: 20px 24px;
  font-family: var(--font-body);
  font-size: 17px; line-height: 1.7;
  color: var(--fg);
  -webkit-overflow-scrolling: touch;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(40px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== RIPPLE EFFECT ===== */
.ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  animation: ripple-anim 0.5s linear;
  background: rgba(255,255,255,0.15);
  pointer-events: none;
}

@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 3px; height: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--fg-3); border-radius: 2px; }

/* ===== EMPTY STATES ===== */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 200px; gap: 12px;
  color: var(--fg-3); font-size: 14px;
}

.empty-state-icon { font-size: 36px; opacity: 0.5; }