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

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, #6a11cb 0%, #fc5c7d 50%, #f7971e 100%);
  background-size: 300% 300%;
  animation: bg-shift 12s ease infinite;
  color: #1a1a2e;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2.5rem 1rem 4rem;
}

@keyframes bg-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ── Glassmorphism card ── */
main {
  width: 100%;
  max-width: 600px;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 24px;
  padding: 2rem 2rem 2.5rem;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.22), 0 1px 0 rgba(255, 255, 255, 0.4) inset;
}

/* ── Header ── */
.app-header {
  margin-bottom: 1.75rem;
}

h1 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: #fff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
  line-height: 1.15;
}

h1 span { color: #ffe066; }

.app-subtitle {
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.65);
  margin-top: 0.3rem;
  letter-spacing: 0.2px;
}

/* ── Section card ── */
.section {
  background: rgba(255, 255, 255, 0.92);
  border-radius: 16px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
}

/* ── Add-task form ── */
form#add-form {
  display: flex;
  gap: 0.6rem;
}

#task-input {
  flex: 1;
  padding: 0.72rem 1rem;
  border: 1.5px solid #e5e7eb;
  border-radius: 10px;
  font-size: 0.93rem;
  font-family: inherit;
  font-weight: 500;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: #fff;
  color: #111827;
}

#task-input::placeholder { color: #b0b7c3; font-weight: 400; }

#task-input:focus {
  outline: none;
  border-color: #818cf8;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.18);
}

#task-input.error {
  border-color: #f87171;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.18);
  animation: shake 0.3s;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-6px); }
  75%       { transform: translateX(6px); }
}

/* ── Buttons base ── */
button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.72rem 1.15rem;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  letter-spacing: 0.1px;
}

button:active { transform: scale(0.96); }

#add-btn {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  color: #fff;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

#add-btn:hover {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.5);
}

/* ── Priority selector ── */
#priority-select {
  padding: 0.72rem 0.65rem;
  border: 1.5px solid #e5e7eb;
  border-radius: 10px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  background: #fff;
  color: #374151;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

#priority-select:focus {
  outline: none;
  border-color: #818cf8;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.18);
}

/* ── Filter + reset bar ── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-bar label {
  font-size: 0.78rem;
  font-weight: 700;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-right: 0.2rem;
}

.filter-btn {
  background: #f3f4f6;
  color: #6b7280;
  padding: 0.38rem 0.9rem;
  font-size: 0.8rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1.5px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.filter-btn:hover {
  background: #e5e7eb;
  color: #374151;
}

.filter-btn.active {
  background: #ede9fe;
  color: #4f46e5;
  border-color: #c4b5fd;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.15);
}

#reset-btn {
  margin-left: auto;
  background: #fff1f2;
  color: #e11d48;
  padding: 0.38rem 0.9rem;
  font-size: 0.8rem;
  border-radius: 999px;
  border: 1.5px solid #fecdd3;
  font-weight: 600;
}

#reset-btn:hover {
  background: #ffe4e6;
  border-color: #fca5a5;
}

/* ── Stats strip ── */
.stats {
  font-size: 0.8rem;
  font-weight: 500;
  color: #9ca3af;
  padding: 0.5rem 0 0.25rem;
  display: flex;
  gap: 1.25rem;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.stat-chip strong {
  font-size: 1rem;
  font-weight: 700;
  color: #374151;
}

/* ── Task list ── */
#task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ── Empty state ── */
#empty-state {
  text-align: center;
  padding: 2.75rem 1rem;
  color: #9ca3af;
  font-size: 0.9rem;
  font-weight: 500;
}

#empty-state .icon {
  font-size: 2.75rem;
  display: block;
  margin-bottom: 0.65rem;
}

/* ── Task item ── */
.task-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #fff;
  border: 1.5px solid #f3f4f6;
  border-radius: 12px;
  padding: 0.85rem 1rem;
  transition: box-shadow 0.18s, border-color 0.18s, opacity 0.2s;
  animation: slide-in 0.22s ease;
}

.task-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  border-color: #e5e7eb;
}

@keyframes slide-in {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.task-item.completed {
  opacity: 0.5;
  background: #f9fafb;
  border-color: #f3f4f6;
}

/* ── Completion celebration ── */
.celebration-burst {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 250;
}

.celebration-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  opacity: 0;
  animation: confetti-burst 850ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

@keyframes confetti-burst {
  0% {
    transform: translate(0, 0) scale(0.5) rotate(0deg);
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  100% {
    transform: translate(var(--x), var(--y)) scale(1.05) rotate(var(--rotate));
    opacity: 0;
  }
}

/* ── Custom checkbox ── */
.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 1.2rem;
  height: 1.2rem;
  min-width: 1.2rem;
  border: 2px solid #d1d5db;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  position: relative;
}

.task-checkbox:hover {
  border-color: #818cf8;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15);
}

.task-checkbox:checked {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  border-color: #6366f1;
}

.task-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 0px;
  width: 5px;
  height: 9px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

/* ── Task text ── */
.task-text {
  flex: 1;
  font-size: 0.92rem;
  font-weight: 500;
  word-break: break-word;
  line-height: 1.45;
  cursor: pointer;
  color: #111827;
}

.task-text:hover .task-title-text {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-color: #818cf8;
}

.task-item.completed .task-text {
  text-decoration: line-through;
  color: #9ca3af;
}

/* ── Priority badge ── */
.priority-badge {
  font-size: 0.67rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  white-space: nowrap;
}

.priority-high   { background: #fee2e2; color: #dc2626; }
.priority-medium { background: #fef3c7; color: #d97706; }
.priority-low    { background: #dcfce7; color: #16a34a; }

/* ── Icon action buttons ── */
.edit-btn,
.delete-btn {
  background: transparent;
  color: #d1d5db;
  padding: 0.3rem 0.45rem;
  font-size: 0.9rem;
  border-radius: 8px;
  line-height: 1;
  transition: background 0.15s, color 0.15s;
}

.edit-btn:hover   { background: #ede9fe; color: #6366f1; }
.delete-btn:hover { background: #fee2e2; color: #dc2626; }

/* ── Inline edit ── */
.edit-input {
  flex: 1;
  padding: 0.4rem 0.65rem;
  border: 1.5px solid #818cf8;
  border-radius: 8px;
  font-size: 0.92rem;
  font-family: inherit;
  font-weight: 500;
  outline: none;
  background: #f5f3ff;
  color: #1e1b4b;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15);
}

.save-btn {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  color: #fff;
  padding: 0.38rem 0.85rem;
  font-size: 0.8rem;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.save-btn:hover { background: linear-gradient(135deg, #6366f1, #4f46e5); }

.cancel-btn {
  background: #f3f4f6;
  color: #6b7280;
  padding: 0.38rem 0.85rem;
  font-size: 0.8rem;
}

.cancel-btn:hover { background: #e5e7eb; }

/* ── Detail dot ── */
.detail-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #818cf8;
  margin-left: 5px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* ── Modal overlay ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 10, 40, 0.6);
  backdrop-filter: blur(6px);
  z-index: 100;
  justify-content: center;
  align-items: center;
  padding: 1rem;
}

.modal-overlay.open {
  display: flex;
  animation: fade-in 0.18s ease;
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── Modal box ── */
.modal {
  background: #fff;
  border-radius: 20px;
  width: 100%;
  max-width: 460px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.3);
  animation: pop-in 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

@keyframes pop-in {
  from { transform: scale(0.88); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.4rem 1.5rem 1rem;
  background: linear-gradient(135deg, #f5f3ff, #ede9fe);
  border-bottom: 1px solid #e9d5ff;
  gap: 0.75rem;
}

.modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: #1e1b4b;
  line-height: 1.4;
  flex: 1;
}

.modal-title span {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: #818cf8;
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.modal-close {
  background: rgba(255, 255, 255, 0.7);
  color: #6b7280;
  border-radius: 8px;
  padding: 0.3rem 0.55rem;
  font-size: 0.95rem;
  line-height: 1;
  flex-shrink: 0;
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.modal-close:hover { background: #fee2e2; color: #dc2626; border-color: #fca5a5; }

.modal-body {
  padding: 1.25rem 1.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-row {
  display: flex;
  gap: 0.85rem;
}

.modal-field {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 0.35rem;
}

.modal-field label {
  font-size: 0.72rem;
  font-weight: 700;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.modal-field input,
.modal-field textarea {
  padding: 0.6rem 0.8rem;
  border: 1.5px solid #e5e7eb;
  border-radius: 10px;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 500;
  background: #f9fafb;
  transition: border-color 0.18s, box-shadow 0.18s;
  resize: vertical;
  color: #111827;
}

.modal-field input:focus,
.modal-field textarea:focus {
  outline: none;
  border-color: #818cf8;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem 1.25rem;
  border-top: 1px solid #f3f4f6;
}

.modal-save-btn {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  color: #fff;
  padding: 0.6rem 1.35rem;
  font-size: 0.88rem;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.modal-save-btn:hover {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.45);
}

.modal-cancel-btn {
  background: #f3f4f6;
  color: #6b7280;
  padding: 0.6rem 1.1rem;
  font-size: 0.88rem;
  border: 1.5px solid #e5e7eb;
}

.modal-cancel-btn:hover { background: #e5e7eb; }