* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --accent: #5b4db8;
  --accent-light: #e8e5f5;
  --bg: #fafbfc;
  --surface: #fff;
  --border: #e0e3e8;
  --text: #1a1a1a;
  --text-secondary: #667085;
  --success: #16a34a;
  --danger: #dc2626;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.08);
}

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  margin-bottom: 32px;
}

.title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.stats {
  display: flex;
  gap: 24px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.stat-count {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}

.create-section {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.create-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form-row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.form-row:first-child {
  align-items: center;
}

.input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.input-title {
  flex: 1;
  font-size: 16px;
}

.input-notes {
  flex: 1;
  resize: vertical;
  min-height: 60px;
  font-family: inherit;
}

.input-notes:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-controls {
  gap: 12px;
}

.form-controls .input {
  flex: 1;
  min-width: 120px;
}

.btn {
  padding: 10px 16px;
  border: none;
  border-radius: calc(var(--radius) - 2px);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: white;
  padding: 10px 20px;
}

.btn-primary:hover {
  background: #4a3fa3;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 12px;
  font-size: 13px;
}

.btn-secondary:hover {
  background: #f5f5f5;
}

.btn-danger {
  background: #fee2e2;
  color: var(--danger);
  padding: 8px 12px;
  font-size: 13px;
}

.btn-danger:hover {
  background: #fecaca;
}

.controls-section {
  background: var(--surface);
  padding: 16px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.search-input {
  width: 100%;
}

.filters {
  display: flex;
  gap: 12px;
}

.filters .input {
  flex: 1;
  min-width: 0;
}

.tasks-section {
  flex: 1;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.task-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.task-item:focus-within {
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.task-item.completed {
  opacity: 0.6;
}

.task-checkbox {
  width: 20px;
  height: 20px;
  min-width: 20px;
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--accent);
}

.task-checkbox:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

.task-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}

.task-title {
  font-size: 15px;
  font-weight: 600;
  word-break: break-word;
  flex: 1;
}

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

.task-priority {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--accent-light);
  color: var(--accent);
  white-space: nowrap;
  flex-shrink: 0;
}

.task-priority.high {
  background: #fee2e2;
  color: var(--danger);
}

.task-priority.low {
  background: #e8f5e9;
  color: #2e7d32;
}

.task-notes {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  word-break: break-word;
  line-height: 1.4;
}

.task-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.task-due {
  display: flex;
  align-items: center;
  gap: 4px;
}

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

.btn-edit,
.btn-delete {
  padding: 6px 10px;
  font-size: 12px;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-secondary);
  font-size: 15px;
}

@media (max-width: 480px) {
  .app {
    padding: 16px;
  }

  .title {
    font-size: 24px;
    margin-bottom: 12px;
  }

  .stats {
    gap: 16px;
  }

  .stat-count {
    font-size: 20px;
  }

  .create-section {
    padding: 16px;
    margin-bottom: 16px;
  }

  .form-row {
    flex-direction: column;
    align-items: stretch;
  }

  .form-row:first-child {
    align-items: stretch;
  }

  .btn-primary {
    width: 100%;
  }

  .filters {
    flex-direction: column;
  }

  .filters .input {
    width: 100%;
  }

  .task-item {
    padding: 12px;
    gap: 10px;
  }

  .task-actions {
    width: 100%;
    gap: 8px;
  }

  .btn-edit,
  .btn-delete {
    flex: 1;
  }
}

@media (max-width: 390px) {
  .app {
    padding: 12px;
  }

  .title {
    font-size: 20px;
    margin-bottom: 10px;
  }

  .stat-label {
    font-size: 10px;
  }

  .stat-count {
    font-size: 18px;
  }

  .input {
    font-size: 16px;
  }

  .create-section {
    padding: 12px;
  }
}