/* -------------------------------------------------------------
 * MUJI-Style & Sticky Note Design System
 * ------------------------------------------------------------- */

/* Google Fonts & Base Variables */
:root {
  --font-primary: 'Plus Jakarta Sans', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Color Palette - Muji Inspired Warm Neutrals */
  --bg-primary: #FAF8F5;       /* Muji off-white background */
  --bg-secondary: #F3EFE9;     /* Slightly darker warm gray/beige */
  --bg-card: #FFFFFF;
  --text-main: #3C3A36;        /* Warm dark charcoal */
  --text-muted: #8E8A82;       /* Mid gray for captions */
  --border-color: #E2DDD5;     /* Warm neutral border */
  --border-focus: #B5A895;     /* Muji accent beige-brown */
  --shadow-sm: 0 2px 8px rgba(60, 58, 54, 0.04);
  --shadow-md: 0 8px 16px rgba(60, 58, 54, 0.06);
  --shadow-lg: 0 16px 32px rgba(60, 58, 54, 0.08);
  --shadow-sticky: 2px 10px 20px rgba(60, 58, 54, 0.07);
  
  /* Sticky Note Pastel Palette */
  --sticky-high-bg: #FFF0F0;
  --sticky-high-border: #FBC2C2;
  --sticky-high-text: #B23B3B;
  --sticky-high-accent: #E85A5A;

  --sticky-medium-bg: #FFFBEA;
  --sticky-medium-border: #F8E3A9;
  --sticky-medium-text: #8A6815;
  --sticky-medium-accent: #E0A922;

  --sticky-low-bg: #F0F9F4;
  --sticky-low-border: #C8EBD4;
  --sticky-low-text: #236940;
  --sticky-low-accent: #37A263;

  --transition-speed: 0.3s;
  --elastic-transition: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* CSS Reset & Defaults */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  /* Soft warm grid pattern overlay representing Japanese craft paper or cork */
  background-image: 
    linear-gradient(rgba(226, 221, 213, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226, 221, 213, 0.3) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* Wrapper Layout */
.muji-app-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* -------------------------------------------------------------
 * HEADER & STATS
 * ------------------------------------------------------------- */
.app-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.logo-area h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.logo-area h1 span {
  font-weight: 300;
  color: var(--text-muted);
}

.logo-area .subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Stats Group */
.stats-container {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-speed) ease;
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-card.pending .stat-icon {
  color: var(--text-muted);
}

.stat-card.completed .stat-icon {
  color: var(--sticky-low-accent);
}

.stat-icon svg {
  display: block;
}

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-number {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.1;
}

/* Progress bar style */
.progress-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 140px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.progress-bar-bg {
  height: 6px;
  background-color: var(--bg-secondary);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(222, 218, 210, 0.5);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background-color: var(--text-main);
  border-radius: 10px;
  transition: width 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

/* -------------------------------------------------------------
 * WORKSPACE LAYOUT
 * ------------------------------------------------------------- */
.app-main {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2.5rem;
  align-items: start;
}

/* Sidebar Styling */
.sidebar-panel {
  position: sticky;
  top: 1.5rem;
}

.panel-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
}

.panel-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: 0.05em;
}

.panel-card h2 svg {
  color: var(--text-muted);
}

/* Forms styling */
.todo-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.input-wrapper {
  position: relative;
  width: 100%;
}

.todo-form input[type="text"],
.todo-form input[type="date"] {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  outline: none;
  font-family: var(--font-primary);
  transition: all var(--transition-speed) ease;
}

.todo-form input[type="text"]:focus,
.todo-form input[type="date"]:focus {
  border-color: var(--border-focus);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(181, 168, 149, 0.15);
}

/* Date picker calendar icon overlay */
.date-picker-wrapper {
  display: flex;
  align-items: center;
}

.date-picker-wrapper input[type="date"] {
  padding-right: 2.5rem;
}

.calendar-icon {
  position: absolute;
  right: 1rem;
  pointer-events: none;
  color: var(--text-muted);
}

/* Priority Option Selectors (Pills) */
.priority-selector {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.priority-option {
  position: relative;
  cursor: pointer;
}

.priority-option input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.priority-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-main);
  transition: all 0.25s ease;
  user-select: none;
}

.priority-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
  background-color: var(--text-muted);
  transition: transform 0.2s ease;
}

/* High Priority radio states */
.priority-option.high input[type="radio"]:checked + .priority-pill {
  background-color: var(--sticky-high-bg);
  border-color: var(--sticky-high-border);
  color: var(--sticky-high-text);
  font-weight: 600;
}
.priority-option.high input[type="radio"]:checked + .priority-pill .dot {
  background-color: var(--sticky-high-accent);
  transform: scale(1.3);
}

/* Medium Priority radio states */
.priority-option.medium input[type="radio"]:checked + .priority-pill {
  background-color: var(--sticky-medium-bg);
  border-color: var(--sticky-medium-border);
  color: var(--sticky-medium-text);
  font-weight: 600;
}
.priority-option.medium input[type="radio"]:checked + .priority-pill .dot {
  background-color: var(--sticky-medium-accent);
  transform: scale(1.3);
}

/* Low Priority radio states */
.priority-option.low input[type="radio"]:checked + .priority-pill {
  background-color: var(--sticky-low-bg);
  border-color: var(--sticky-low-border);
  color: var(--sticky-low-text);
  font-weight: 600;
}
.priority-option.low input[type="radio"]:checked + .priority-pill .dot {
  background-color: var(--sticky-low-accent);
  transform: scale(1.3);
}

/* Submit button design */
.submit-btn {
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem;
  background-color: var(--text-main);
  color: #FFFFFF;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed) ease;
}

.submit-btn:hover {
  background-color: #55514B;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.submit-btn:active {
  transform: translateY(0);
}

/* -------------------------------------------------------------
 * BOARD & STICKY NOTE GRID
 * ------------------------------------------------------------- */
.board-panel {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.board-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.title-with-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.title-with-badge h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.badge {
  background-color: var(--text-main);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: 12px;
  min-width: 24px;
  text-align: center;
  display: inline-block;
  line-height: 1.4;
}

.badge.secondary {
  background-color: var(--text-muted);
}

/* Select sorting */
.select-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.select-wrapper select {
  appearance: none;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.45rem 2rem 0.45rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 6px;
  color: var(--text-main);
  font-family: var(--font-primary);
  outline: none;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed) ease;
}

.select-wrapper select:focus {
  border-color: var(--border-focus);
}

.select-arrow {
  position: absolute;
  right: 0.75rem;
  pointer-events: none;
  color: var(--text-muted);
}

/* Sticky notes display grid */
.sticky-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
  min-height: 200px;
}

/* Sticky Note Card Design */
.sticky-note {
  position: relative;
  padding: 1.5rem 1.25rem 1.25rem 1.25rem;
  border-radius: 2px 2px 2px 20px; /* Peel effect at bottom-left */
  aspect-ratio: 1 / 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sticky);
  border: 1px solid rgba(0, 0, 0, 0.03);
  transition: transform 0.3s var(--elastic-transition), box-shadow 0.3s ease;
  overflow: hidden;
  cursor: default;
  /* Top accent strip like tape or glue area */
  background-image: linear-gradient(to bottom, rgba(0,0,0,0.02) 0%, rgba(0,0,0,0.02) 20px, transparent 20px);
}

/* Random rotations via JS or static pattern */
.sticky-note:nth-child(2n) {
  transform: rotate(0.8deg);
}
.sticky-note:nth-child(2n+1) {
  transform: rotate(-1.2deg);
}
.sticky-note:nth-child(3n) {
  transform: rotate(0.5deg);
}
.sticky-note:nth-child(3n+1) {
  transform: rotate(-0.7deg);
}

.sticky-note:hover {
  transform: translateY(-6px) scale(1.03) rotate(0deg) !important;
  box-shadow: 0 12px 24px rgba(60, 58, 54, 0.15);
  z-index: 10;
}

/* Priority styling colors mapping */
.sticky-note.priority-high {
  background-color: var(--sticky-high-bg);
  border-left: 4px solid var(--sticky-high-accent);
  color: var(--sticky-high-text);
}
.sticky-note.priority-medium {
  background-color: var(--sticky-medium-bg);
  border-left: 4px solid var(--sticky-medium-accent);
  color: var(--sticky-medium-text);
}
.sticky-note.priority-low {
  background-color: var(--sticky-low-bg);
  border-left: 4px solid var(--sticky-low-accent);
  color: var(--sticky-low-text);
}

/* Pushpin/Tape illusion at top center */
.sticky-note::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 12px;
  background-color: rgba(255, 255, 255, 0.4);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  backdrop-filter: blur(1px);
}

/* Sticky note content layout */
.sticky-content {
  margin-top: 0.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Title text */
.sticky-title {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.45;
  word-break: break-word;
  white-space: pre-wrap;
  margin-bottom: 1rem;
}

/* Date info card */
.sticky-due {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.85;
}

.sticky-due svg {
  display: block;
}

.sticky-due.overdue {
  color: #D9534F;
  animation: pulse-alert 2s infinite ease-in-out;
}

.sticky-due.due-today {
  color: var(--sticky-medium-text);
}

/* Hover actions menu inside note */
.sticky-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.5rem;
  border-top: 1px dashed rgba(60, 58, 54, 0.1);
  padding-top: 0.65rem;
  margin-top: 0.5rem;
}

/* Sticky action buttons */
.btn-action {
  background: none;
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: currentColor;
  opacity: 0.7;
  transition: all 0.2s ease;
}

.btn-action:hover {
  opacity: 1;
  background-color: rgba(0, 0, 0, 0.05);
}

.btn-action.btn-complete:hover {
  color: var(--sticky-low-accent);
  background-color: rgba(35, 105, 64, 0.1);
}

.btn-action.btn-delete:hover {
  color: var(--sticky-high-accent);
  background-color: rgba(178, 59, 59, 0.1);
}

/* -------------------------------------------------------------
 * COMPLETED LIST SECTION
 * ------------------------------------------------------------- */
.completed-section {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.text-btn {
  background: none;
  border: none;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  transition: all var(--transition-speed) ease;
}

.text-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-secondary);
}

/* Completed items container */
.completed-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Completed list item row style */
.completed-item {
  background-color: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  animation: slide-in 0.3s ease-out;
}

.completed-item:hover {
  background-color: #FFFFFF;
  box-shadow: var(--shadow-md);
}

.completed-item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-grow: 1;
}

/* Custom checkbox inside completed list */
.custom-checkbox {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--sticky-low-accent);
  background-color: rgba(35, 105, 64, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--sticky-low-accent);
  transition: all 0.2s ease;
}

.custom-checkbox svg {
  display: block;
  stroke-width: 3px;
}

.completed-item-text {
  text-decoration: line-through;
  color: var(--text-muted);
  font-size: 0.95rem;
  word-break: break-all;
}

.completed-item-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.completed-priority-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.completed-priority-tag.high {
  background-color: var(--sticky-high-bg);
  color: var(--sticky-high-text);
  border: 1px solid var(--sticky-high-border);
}

.completed-priority-tag.medium {
  background-color: var(--sticky-medium-bg);
  color: var(--sticky-medium-text);
  border: 1px solid var(--sticky-medium-border);
}

.completed-priority-tag.low {
  background-color: var(--sticky-low-bg);
  color: var(--sticky-low-text);
  border: 1px solid var(--sticky-low-border);
}

/* Delete icon inside completed list */
.btn-delete-completed {
  color: var(--text-muted);
}

.btn-delete-completed:hover {
  color: var(--sticky-high-accent) !important;
  background-color: rgba(178, 59, 59, 0.08) !important;
}

/* -------------------------------------------------------------
 * STATE EMPTY / NO DATA
 * ------------------------------------------------------------- */
.empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1.5rem;
  background-color: rgba(255, 255, 255, 0.4);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  color: var(--text-muted);
}

.empty-icon {
  margin-bottom: 1rem;
  color: var(--text-muted);
  opacity: 0.6;
}

.empty-state p {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.empty-state span {
  font-size: 0.8rem;
  opacity: 0.8;
}

.completed-list .empty-state {
  padding: 1.5rem;
  border-style: solid;
}

.completed-list .empty-state p {
  font-size: 0.85rem;
  font-weight: 500;
  margin: 0;
}

/* Screen reader only utility class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* -------------------------------------------------------------
 * ANIMATIONS & TRANSITIONS
 * ------------------------------------------------------------- */

/* Scale-in for new items */
.animate-add {
  animation: pop-in 0.4s var(--elastic-transition) forwards;
}

/* Fade-out for deleted items */
.animate-remove {
  animation: fade-out-down 0.3s ease-out forwards;
  pointer-events: none;
}

/* Toast message alerts */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--text-main);
  color: #FFFFFF;
  padding: 0.75rem 1.5rem;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  letter-spacing: 0.05em;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

@keyframes pop-in {
  0% {
    opacity: 0;
    transform: scale(0.7) rotate(-3deg);
  }
  100% {
    opacity: 1;
    transform: scale(1) rotate(var(--rot, 0deg));
  }
}

@keyframes fade-out-down {
  0% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  100% {
    opacity: 0;
    transform: scale(0.85) translateY(20px);
  }
}

@keyframes slide-in {
  0% {
    opacity: 0;
    transform: translateY(-10px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse-alert {
  0% { opacity: 0.8; }
  50% { opacity: 0.4; }
  100% { opacity: 0.8; }
}

/* -------------------------------------------------------------
 * COVER SCREEN OVERLAY
 * ------------------------------------------------------------- */
.app-cover-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-primary);
  /* Use same warm grid pattern overlay for continuity */
  background-image: 
    linear-gradient(rgba(226, 221, 213, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(226, 221, 213, 0.3) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease, transform 0.5s ease, visibility 0.5s;
  opacity: 1;
  visibility: visible;
}

.app-cover-screen.fade-out {
  opacity: 0;
  transform: scale(1.04);
  visibility: hidden;
  pointer-events: none;
}

.cover-content {
  text-align: center;
  max-width: 420px;
  width: 90%;
  padding: 2.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  animation: pop-in 0.6s var(--elastic-transition) forwards;
}

.logo-container {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  background-color: #FFFFFF;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-speed) ease;
}

.logo-container:hover {
  transform: rotate(5deg) scale(1.05);
}

.cover-logo {
  width: 90%;
  height: 90%;
  object-fit: contain;
}

.cover-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.1em;
}

.cover-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-top: -0.5rem;
  line-height: 1.5;
}

.cover-enter-btn {
  margin-top: 0.5rem;
  padding: 0.8rem 2.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--text-main);
  border: none;
  border-radius: 30px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s var(--elastic-transition);
}

.cover-enter-btn:hover {
  background-color: #55514B;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cover-enter-btn:active {
  transform: translateY(0);
}

/* -------------------------------------------------------------
 * RESPONSIVE RULES
 * ------------------------------------------------------------- */
@media (max-width: 900px) {
  .app-main {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .sidebar-panel {
    position: static;
  }
}

@media (max-width: 600px) {
  .muji-app-wrapper {
    padding: 1.5rem 1rem;
    gap: 1.5rem;
  }
  
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 1.25rem;
    padding-bottom: 1.5rem;
  }
  
  .stats-container {
    justify-content: space-between;
  }
  
  .progress-wrapper {
    flex-grow: 1;
    min-width: 100%;
    margin-top: 0.25rem;
  }
  
  .sticky-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
  }
  
  .sticky-note {
    padding: 1.25rem 1rem 1rem 1rem;
  }
  
  .sticky-title {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
  }
  
  .completed-item {
    padding: 0.75rem 1rem;
  }
}