:root {
  --ink: #0b1020;
  --accent: #6d7cff;
  --accent-2: #3ecfc0;
  --danger: #ff6b8a;
  --success: #3ecfc0;

  --glass-bg: rgba(16, 20, 38, 0.62);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-shadow: rgba(4, 8, 24, 0.55);

  --text-main: #f4f6ff;
  --text-muted: rgba(244, 246, 255, 0.68);
  --text-faint: rgba(244, 246, 255, 0.42);

  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  font-size: 16px;
}

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

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "IBM Plex Sans Arabic", "Segoe UI", Tahoma, Arial, sans-serif;
  color: var(--text-main);
  background: var(--ink);
  overflow-x: hidden;
  min-height: 100vh;
  letter-spacing: 0.01em;
}

button,
input {
  font-family: inherit;
}

.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;
}

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 18% 12%, #1b2450 0%, transparent 48%),
    radial-gradient(circle at 88% 82%, #12283d 0%, transparent 50%),
    linear-gradient(165deg, #080c18 0%, #10182c 48%, #0c1426 100%);
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.38;
  will-change: transform;
}

.blob--one {
  width: 42vw;
  height: 42vw;
  top: -14%;
  left: -12%;
  background: radial-gradient(circle, #5b6cff, transparent 70%);
  animation: drift-one 24s ease-in-out infinite;
}

.blob--two {
  width: 36vw;
  height: 36vw;
  bottom: -16%;
  right: -10%;
  background: radial-gradient(circle, #2bb8b0, transparent 70%);
  animation: drift-two 28s ease-in-out infinite;
}

.blob--three {
  width: 28vw;
  height: 28vw;
  top: 42%;
  left: 58%;
  background: radial-gradient(circle, #7a5cff, transparent 70%);
  animation: drift-three 32s ease-in-out infinite;
}

.grain {
  position: absolute;
  inset: 0;
  opacity: 0.08;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@keyframes drift-one {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(5vw, 7vh) scale(1.1); }
}
@keyframes drift-two {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-6vw, -5vh) scale(1.06); }
}
@keyframes drift-three {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-46%, -54%) scale(1.12); }
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 48px 20px 36px;
}

.app__header {
  width: 100%;
  max-width: 540px;
  margin-bottom: 22px;
}

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

.brand__mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(145deg, #6d7cff, #4f63ff);
  box-shadow: 0 10px 24px -10px rgba(93, 110, 255, 0.8);
  flex-shrink: 0;
}

.app__title {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.app__subtitle {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 400;
}

.app__footer {
  margin-top: 22px;
  color: var(--text-faint);
  font-size: 0.8rem;
  text-align: center;
}

.card {
  width: 100%;
  max-width: 540px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  backdrop-filter: blur(26px) saturate(140%);
  -webkit-backdrop-filter: blur(26px) saturate(140%);
  box-shadow:
    0 28px 60px -24px var(--glass-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.add-form {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}

.add-form__input {
  flex: 1;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  outline: none;
  transition: border-color .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease);
}

.add-form__input::placeholder {
  color: var(--text-faint);
}

.add-form__input:focus {
  border-color: rgba(109, 124, 255, 0.7);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 0 4px rgba(109, 124, 255, 0.16);
}

.add-form__btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 48px;
  padding: 0 16px;
  border: none;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #6d7cff, #5163f5);
  color: #fff;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), filter .18s var(--ease);
  box-shadow: 0 10px 22px -10px rgba(93, 110, 255, 0.75);
}

.add-form__btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.add-form__btn:active {
  transform: translateY(0) scale(0.98);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.metric {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
}

.metric__value {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
}

.metric__label {
  display: block;
  margin-top: 2px;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.stats {
  margin-bottom: 14px;
}

.stats__progress-track {
  width: 100%;
  height: 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
  margin-bottom: 10px;
}

.stats__progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width .4s var(--ease);
}

.stats__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.clear-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--danger);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 5px 8px;
  border-radius: 8px;
  transition: background .15s var(--ease), opacity .15s var(--ease);
}

.clear-btn:hover:not(:disabled) {
  background: rgba(255, 107, 138, 0.12);
}

.clear-btn:disabled {
  opacity: 0.32;
  cursor: not-allowed;
}

.filters {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  padding: 4px;
  background: rgba(0, 0, 0, 0.22);
  border-radius: 12px;
}

.filter-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 9px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease);
}

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

.filter-btn.is-active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08);
}

.filter-btn__count {
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  font-size: 0.68rem;
  line-height: 18px;
  font-weight: 600;
}

.filter-btn.is-active .filter-btn__count {
  background: rgba(109, 124, 255, 0.35);
}

.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 44vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.task-list::-webkit-scrollbar { width: 6px; }
.task-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
}

.task {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  animation: task-in .3s var(--ease);
  transition: background .18s var(--ease), border-color .18s var(--ease), opacity .18s var(--ease);
  user-select: none;
}

.task.is-dragging {
  opacity: 0.42;
  animation: none;
  pointer-events: none;
}

.task-list.is-sorting .task {
  animation: none;
}

.task__grip {
  flex-shrink: 0;
  width: 22px;
  height: 32px;
  border: none;
  padding: 0;
  background: transparent;
  color: var(--text-faint);
  cursor: grab;
  display: grid;
  place-items: center;
  border-radius: 6px;
  touch-action: none;
}

.task__grip:active {
  cursor: grabbing;
}

.task__grip:hover,
.task__grip:focus-visible {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.06);
}

.task:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.12);
}

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

.task.is-removing {
  animation: task-out .26s var(--ease) forwards;
}

@keyframes task-out {
  to {
    opacity: 0;
    transform: translateX(18px) scale(0.96);
    margin-top: -52px;
    padding-top: 0;
    padding-bottom: 0;
  }
}

.task__checkbox {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  border: 1.8px solid rgba(62, 207, 192, 0.85);
  background: transparent;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s var(--ease), transform .15s var(--ease), border-color .2s var(--ease);
}

.task__checkbox svg {
  width: 12px;
  height: 12px;
  opacity: 0;
  transform: scale(0.5);
  transition: opacity .18s var(--ease), transform .18s var(--ease);
  color: #0b1020;
}

.task__checkbox:hover { transform: scale(1.06); }

.task.is-done .task__checkbox {
  background: linear-gradient(135deg, var(--accent-2), #5b8dff);
  border-color: transparent;
}

.task.is-done .task__checkbox svg {
  opacity: 1;
  transform: scale(1);
}

.task__body {
  flex: 1;
  min-width: 0;
}

.task__text {
  display: block;
  font-size: 0.94rem;
  line-height: 1.45;
  word-break: break-word;
  cursor: text;
  transition: color .2s var(--ease), opacity .2s var(--ease);
}

.task.is-done .task__text {
  color: var(--text-faint);
  text-decoration: line-through;
  text-decoration-color: rgba(255, 107, 138, 0.55);
}

.task__meta {
  display: block;
  margin-top: 2px;
  font-size: 0.7rem;
  color: var(--text-faint);
}

.task__edit {
  width: 100%;
  border: 1px solid rgba(109, 124, 255, 0.55);
  background: rgba(8, 12, 24, 0.45);
  color: var(--text-main);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 0.94rem;
  outline: none;
}

.task__delete {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-faint);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.55;
  transition: color .18s var(--ease), background .18s var(--ease), opacity .18s var(--ease);
}

.task:hover .task__delete,
.task__delete:focus-visible {
  opacity: 1;
}

.task__delete:hover {
  color: var(--danger);
  background: rgba(255, 107, 138, 0.12);
}

.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 34px 10px 16px;
  color: var(--text-faint);
  text-align: center;
}

.empty-state__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(62, 207, 192, 0.1);
  color: var(--accent-2);
}

.empty-state p {
  margin: 0;
  font-size: 0.88rem;
  max-width: 260px;
  line-height: 1.6;
}

.card.is-empty .task-list { display: none; }
.empty-state[hidden] { display: none !important; }
.card.is-empty .empty-state { display: flex; }

@media (max-width: 480px) {
  .app { padding: 28px 14px 24px; }
  .card { padding: 16px; border-radius: 18px; }
  .add-form { flex-direction: column; }
  .add-form__btn { width: 100%; justify-content: center; height: 44px; }
  .filter-btn { font-size: 0.74rem; }
  .brand__mark { width: 42px; height: 42px; }
}