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

:root {
  --indigo-50:  #eef2ff;
  --indigo-100: #e0e7ff;
  --indigo-200: #c7d2fe;
  --indigo-500: #6366f1;
  --indigo-600: #4f46e5;
  --indigo-700: #4338ca;
  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --red-100: #fee2e2;
  --red-600: #dc2626;
  --amber-100: #fef3c7;
  --amber-600: #d97706;
  --green-100: #d1fae5;
  --green-600: #059669;

  --font: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.05);
  --transition: 150ms ease;
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.5;
  min-height: 100vh;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.app { display: flex; flex-direction: column; min-height: 100vh; }

.app-header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky; top: 0; z-index: 10;
  box-shadow: var(--shadow);
}
.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand { display: flex; align-items: center; gap: .5rem; }
.brand-icon {
  font-size: 1.4rem;
  color: var(--indigo-600);
  line-height: 1;
}
.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: -.02em;
}

.stats {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-shrink: 0;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 44px;
}
.stat-label {
  font-size: .65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--gray-400);
  line-height: 1;
}
.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.2;
}
.stat-divider {
  width: 1px;
  height: 28px;
  background: var(--gray-200);
}

.app-main {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.create-section,
.tasks-section {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 1rem;
  letter-spacing: -.01em;
}

.create-form { display: flex; flex-direction: column; gap: .75rem; }

.form-row {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  align-items: flex-start;
}

.field {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  min-width: 120px;
}
.field--grow { flex: 1 1 200px; }

.field label {
  font-size: .8rem;
  font-weight: 500;
  color: var(--gray-600);
  line-height: 1;
}
.required { color: var(--indigo-600); margin-left: 1px; }

input[type="text"],
input[type="search"],
input[type="date"],
select,
textarea {
  width: 100%;
  font-family: var(--font);
  font-size: .9rem;
  color: var(--gray-800);
  background: var(--gray-50);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius);
  padding: .45rem .65rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .55rem center;
  padding-right: 1.8rem;
}
textarea { resize: vertical; min-height: 56px; line-height: 1.5; }

input:focus, select:focus, textarea:focus {
  border-color: var(--indigo-500);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
  background: #fff;
}
input:focus-visible, select:focus-visible, textarea:focus-visible,
button:focus-visible {
  outline: 2px solid var(--indigo-500);
  outline-offset: 2px;
}

.form-actions { display: flex; justify-content: flex-end; gap: .5rem; }

.form-error {
  font-size: .8rem;
  color: var(--red-600);
  min-height: 1em;
  margin-top: -.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  font-family: var(--font);
  font-size: .875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  padding: .5rem 1.1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  text-decoration: none;
  outline: none;
}
.btn--primary {
  background: var(--indigo-600);
  color: #fff;
}
.btn--primary:hover { background: var(--indigo-700); box-shadow: var(--shadow-md); }
.btn--primary:active { background: var(--indigo-700); transform: translateY(1px); }

.btn--ghost {
  background: transparent;
  color: var(--gray-600);
  border: 1.5px solid var(--gray-300);
}
.btn--ghost:hover { background: var(--gray-100); color: var(--gray-800); }

.btn--icon {
  padding: .35rem .5rem;
  background: transparent;
  color: var(--gray-400);
  border-radius: var(--radius);
  font-size: .85rem;
  border: 1.5px solid transparent;
}
.btn--icon:hover { background: var(--gray-100); color: var(--gray-700); border-color: var(--gray-200); }
.btn--icon.delete:hover { background: var(--red-100); color: var(--red-600); border-color: var(--red-100); }

.toolbar {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.toolbar-search { flex: 1 1 180px; }
.toolbar-search input {
  width: 100%;
  padding-left: 2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: .65rem center;
}
.toolbar-filters { display: flex; gap: .5rem; flex-wrap: wrap; }
.toolbar-filters select { min-width: 110px; }

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  padding: .85rem 1rem;
  background: #fff;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.task-item:hover { border-color: var(--gray-300); box-shadow: var(--shadow); }
.task-item.completed { background: var(--gray-50); }

.task-toggle {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--indigo-600);
  cursor: pointer;
}
.task-toggle:focus-visible {
  outline: 2px solid var(--indigo-500);
  outline-offset: 2px;
}

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

.task-title-text {
  font-size: .95rem;
  font-weight: 500;
  color: var(--gray-900);
  word-break: break-word;
  line-height: 1.4;
}
.completed .task-title-text {
  text-decoration: line-through;
  color: var(--gray-400);
}

.task-notes-text {
  font-size: .8rem;
  color: var(--gray-500);
  margin-top: .2rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: .4rem;
  margin-top: .4rem;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 600;
  padding: .1rem .45rem;
  border-radius: 999px;
  letter-spacing: .03em;
  text-transform: capitalize;
}
.badge--low    { background: var(--green-100); color: var(--green-600); }
.badge--medium { background: var(--amber-100); color: var(--amber-600); }
.badge--high   { background: var(--red-100);   color: var(--red-600); }

.task-due-text {
  font-size: .72rem;
  color: var(--gray-400);
}
.task-due-text.overdue { color: var(--red-600); font-weight: 600; }

.task-actions {
  display: flex;
  align-items: center;
  gap: .25rem;
  flex-shrink: 0;
  margin-top: 0;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--gray-400);
}
.empty-icon {
  font-size: 2.5rem;
  margin-bottom: .75rem;
  color: var(--gray-300);
}
.empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-500);
  margin-bottom: .3rem;
}
.empty-sub { font-size: .875rem; }

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal[hidden] { display: none; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.35);
  backdrop-filter: blur(2px);
}
.modal-box {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1.75rem;
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
}

@media (max-width: 480px) {
  .header-inner { height: 56px; }
  .brand-name { font-size: 1.1rem; }
  .stat-label { display: none; }
  .stat-value { font-size: .95rem; }

  .app-main { padding: 1rem .75rem 2rem; gap: 1rem; }
  .create-section, .tasks-section { padding: 1rem; }

  .form-row { flex-direction: column; }
  .field { min-width: 0; }

  .toolbar { flex-direction: column; }
  .toolbar-filters { width: 100%; }
  .toolbar-filters select { flex: 1; }

  .task-item { padding: .7rem .75rem; gap: .5rem; }
  .task-actions { gap: .15rem; }
  .btn--icon { padding: .3rem .4rem; }

  .modal-box { padding: 1.25rem; }
}