@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Pretendard:wght@300;400;500;600;700&display=swap');

:root {
  --bg-base: #080b11;
  --bg-surface: #101622;
  --bg-card: rgba(18, 26, 41, 0.75);
  --bg-card-hover: rgba(26, 37, 58, 0.9);
  --bg-input: #0c121d;

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-glow: rgba(99, 102, 241, 0.35);

  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);

  --accent-cyan: #06b6d4;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 24px -4px var(--primary-glow);

  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Pretendard', 'Outfit', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(6, 182, 212, 0.08) 0%, transparent 45%);
  background-attachment: fixed;
}

/* Container */
.app-container {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 20px 80px 20px;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
  border-radius: var(--radius-full);
  font-weight: 600;
  -webkit-text-fill-color: #a5b4fc;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cloud-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.cloud-status-badge:hover {
  background: rgba(16, 185, 129, 0.2);
}

.cloud-status-badge.offline {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
  color: #fbbf24;
}

.cloud-status-badge.syncing {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

.btn-pwa-install {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #6366f1, #7c3aed);
  color: white;
  border: none;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-pwa-install:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.5);
}

/* Stats Dashboard */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

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

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.stat-card.progress-card {
  grid-column: span 2;
}

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

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 6px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #6366f1, #06b6d4);
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
}

/* Quick Add Box */
.add-box {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}

.add-box-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-group-main {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.todo-input-title {
  flex: 1;
  min-width: 0;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.todo-input-title:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.btn-add {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 20px;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-add:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.add-box-options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.option-select, .option-date {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 7px 10px;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.option-select:focus, .option-date:focus {
  border-color: var(--primary);
  color: var(--text-main);
}

.todo-input-desc {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.85rem;
  padding: 8px 12px;
  margin-top: 10px;
  outline: none;
}

.todo-input-desc:focus {
  border-color: var(--primary);
}

/* Filter & Controls Bar */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.search-and-sort {
  display: flex;
  gap: 10px;
}

.search-box {
  flex: 1;
  position: relative;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 16px 10px 38px;
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: var(--text-dim);
}

.sort-select {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0 14px;
  outline: none;
  cursor: pointer;
}

.status-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.status-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

/* Category Filters */
.category-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 4px 10px;
  cursor: pointer;
  transition: var(--transition);
}

.pill-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.15);
}

.pill-btn.active {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
}

/* Todo List */
.todo-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.todo-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  position: relative;
}

.todo-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.todo-item.completed {
  opacity: 0.6;
  background: rgba(13, 20, 32, 0.5);
}

.todo-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--border-subtle);
  background: var(--bg-input);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
  transition: var(--transition);
  flex-shrink: 0;
}

.todo-checkbox:hover {
  border-color: var(--primary);
}

.todo-checkbox:checked {
  background: var(--accent-emerald);
  border-color: var(--accent-emerald);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.todo-checkbox:checked::after {
  content: '✓';
  color: white;
  font-size: 13px;
  font-weight: 800;
}

.todo-content {
  flex: 1;
  min-width: 0;
}

.todo-header-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.todo-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  word-break: break-word;
  transition: var(--transition);
}

.todo-item.completed .todo-title {
  text-decoration: line-through;
  color: var(--text-dim);
}

.todo-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 3px;
  line-height: 1.4;
  word-break: break-word;
}

/* Badges */
.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-cat-business { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.badge-cat-dev { background: rgba(168, 85, 247, 0.15); color: #c084fc; border: 1px solid rgba(168, 85, 247, 0.3); }
.badge-cat-finance { background: rgba(16, 185, 129, 0.15); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.3); }
.badge-cat-personal { background: rgba(245, 158, 11, 0.15); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.3); }

.badge-prio-high { background: rgba(244, 63, 94, 0.15); color: #fb7185; border: 1px solid rgba(244, 63, 94, 0.3); }
.badge-prio-medium { background: rgba(99, 102, 241, 0.15); color: #818cf8; border: 1px solid rgba(99, 102, 241, 0.3); }
.badge-prio-low { background: rgba(148, 163, 184, 0.15); color: #cbd5e1; border: 1px solid rgba(148, 163, 184, 0.2); }

.badge-overdue {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.badge-due {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.todo-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.85;
}

.btn-icon {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  transition: var(--transition);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-icon.delete:hover {
  background: rgba(244, 63, 94, 0.2);
  color: #fb7185;
  border-color: rgba(244, 63, 94, 0.3);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
  color: var(--text-dim);
}

.empty-icon {
  font-size: 38px;
  margin-bottom: 12px;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  padding: 20px;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(10px);
  transition: transform 0.2s ease;
}

.modal-backdrop.active .modal-content {
  transform: translateY(0);
}

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

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal-field label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.modal-field input, .modal-field textarea, .modal-field select {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 10px;
  font-size: 0.9rem;
  outline: none;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  box-shadow: var(--shadow-card);
  color: white;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Category Manager Modal & Swatches */
.category-manager-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 220px;
  overflow-y: auto;
  padding-right: 4px;
}

.category-row-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.category-row-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.category-row-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 500;
}

.cat-color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}

.cat-default-badge {
  font-size: 0.65rem;
  color: var(--text-dim);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
}

.category-add-card {
  background: rgba(0, 0, 0, 0.25);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-top: 14px;
}

.emoji-palette, .color-palette {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.emoji-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 1.1rem;
  transition: var(--transition);
}

.emoji-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.emoji-btn.selected {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.25);
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.4);
}

.color-swatch-btn {
  width: 26px;
  height: 26px;
  padding: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.color-swatch-btn.selected {
  border-color: #ffffff;
  transform: scale(1.15);
  box-shadow: 0 0 10px currentColor;
}

/* Footer & Kodari note */
.app-footer {
  text-align: center;
  margin-top: 40px;
  color: var(--text-dim);
  font-size: 0.75rem;
  line-height: 1.6;
}

.app-footer a {
  color: var(--primary);
  text-decoration: none;
}

/* View Switcher */
.view-switcher-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.view-mode-toggle {
  display: inline-flex;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 4px;
  gap: 4px;
}

.view-mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.view-mode-btn:hover {
  color: var(--text-main);
}

.view-mode-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.4);
}

/* Calendar View */
.calendar-view-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.calendar-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.calendar-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.calendar-month-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.calendar-nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  width: 100%;
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 8px;
  width: 100%;
}

.calendar-weekday {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  padding: 6px 0;
}

.calendar-weekday.sun { color: #f87171; }
.calendar-weekday.sat { color: #38bdf8; }

.calendar-day-cell {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  min-height: 96px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  min-width: 0;
  overflow: hidden;
}

.calendar-day-cell:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.calendar-day-cell.other-month {
  opacity: 0.28;
  background: rgba(10, 14, 23, 0.3);
}

.calendar-day-cell.today {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 14px -2px rgba(6, 182, 212, 0.4);
}

.calendar-day-cell.selected {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.12);
  box-shadow: 0 0 16px -2px rgba(99, 102, 241, 0.5);
}

.calendar-day-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.cal-day-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.calendar-day-cell.today .cal-day-num {
  background: var(--accent-cyan);
  color: #080b11;
  box-shadow: 0 0 8px rgba(6, 182, 212, 0.6);
}

.calendar-day-cell.is-sun .cal-day-num { color: #f87171; }
.calendar-day-cell.is-sat .cal-day-num { color: #38bdf8; }
.calendar-day-cell.today.is-sun .cal-day-num,
.calendar-day-cell.today.is-sat .cal-day-num { color: #080b11; }

.cal-task-count-dot {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
}

.cal-tasks-container {
  display: flex;
  flex-direction: column;
  gap: 3px;
  overflow: hidden;
  max-height: 56px;
  min-width: 0;
  width: 100%;
}

.cal-task-mini {
  font-size: 0.68rem;
  padding: 2px 5px;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
  border-left: 2.5px solid var(--primary);
  min-width: 0;
  max-width: 100%;
  display: block;
}

.cal-task-mini.completed {
  opacity: 0.5;
  text-decoration: line-through;
}

.cal-task-mini.cat-business { border-left-color: #3b82f6; }
.cal-task-mini.cat-dev { border-left-color: #a855f7; }
.cal-task-mini.cat-finance { border-left-color: #10b981; }
.cal-task-mini.cat-personal { border-left-color: #f59e0b; }

.cal-more-indicator {
  font-size: 0.62rem;
  color: var(--text-dim);
  text-align: right;
  margin-top: 2px;
}

/* Selected Date Panel */
.selected-date-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.selected-date-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.selected-date-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
}

.btn-add-for-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-add-for-date:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  .app-container {
    padding: 14px 10px 60px 10px;
  }

  /* Header mobile layout */
  .app-header {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 16px;
  }

  .brand-section {
    width: 100%;
    align-items: center;
  }

  .brand-text h1 {
    font-size: 1.15rem;
    flex-wrap: wrap;
    gap: 6px;
  }

  .header-actions {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
  }

  .cloud-status-badge {
    font-size: 0.75rem;
    padding: 6px 12px;
  }

  .btn-pwa-install {
    font-size: 0.75rem;
    padding: 6px 12px;
  }

  /* Dashboard Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .stat-card {
    padding: 12px;
  }

  .stat-card.progress-card {
    grid-column: span 2;
  }

  /* Add Box */
  .add-box {
    padding: 16px;
  }

  .input-group-main {
    flex-direction: column;
    gap: 10px;
  }

  .todo-input-title {
    width: 100%;
    padding: 12px 14px;
    font-size: 0.92rem;
  }

  .btn-add {
    width: 100%;
    height: 44px;
    justify-content: center;
    font-size: 0.95rem;
  }

  .add-box-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .option-select {
    width: 100%;
    font-size: 0.82rem;
    padding: 9px 10px;
  }

  .option-date {
    grid-column: span 2;
    width: 100%;
    font-size: 0.82rem;
    padding: 9px 12px;
  }

  /* Filter & Controls */
  .search-and-sort {
    flex-direction: column;
    gap: 8px;
  }

  .sort-select {
    height: 38px;
    width: 100%;
  }

  /* View Switcher */
  .view-switcher-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .view-mode-toggle {
    display: flex;
    width: 100%;
  }

  .view-mode-btn {
    flex: 1;
    justify-content: center;
  }

  /* Calendar */
  .calendar-card {
    padding: 14px;
  }

  .calendar-nav-bar {
    margin-bottom: 14px;
  }

  .calendar-month-title {
    font-size: 1.1rem;
  }

  .calendar-day-cell {
    min-height: 56px;
    padding: 4px;
  }

  .cal-day-num {
    font-size: 0.75rem;
    width: 20px;
    height: 20px;
  }

  .cal-tasks-container {
    display: none; /* In mobile viewport, show task count dots only */
  }

  .selected-date-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .btn-add-for-date {
    width: 100%;
    justify-content: center;
  }
}