/* ========================================================================
   Taskora — Premium Todo List
   Design tokens, layout & components
   ======================================================================== */

:root {
  /* Background palette */
  --bg-0: #07050f;
  --bg-1: #0f0a1e;
  --bg-2: #1a1130;
  --bg-3: #2a1a4a;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);

  /* Foreground */
  --fg-1: #f5f3ff;
  --fg-2: #d6d0ee;
  --fg-3: #948cb8;
  --fg-4: #6e6691;

  /* Accent */
  --accent-1: #a78bfa;     /* violet-400 */
  --accent-2: #c4b5fd;     /* violet-300 */
  --accent-3: #7c3aed;     /* violet-600 */
  --accent-4: #f472b6;     /* pink-400 */

  --success: #34d399;
  --danger: #f87171;

  /* Borders & shadows */
  --border-1: rgba(255, 255, 255, 0.06);
  --border-2: rgba(255, 255, 255, 0.10);
  --shadow-1: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-2: 0 10px 40px rgba(124, 58, 237, 0.18);
  --shadow-3: 0 30px 80px rgba(124, 58, 237, 0.25);

  /* Geometry */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --duration-fast: 0.18s;
  --duration-normal: 0.32s;
  --easing: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--fg-1);
  background: var(--bg-0);
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(20px, 5vw, 60px) 20px;
  position: relative;
}

/* Aurora gradient background */
.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 50% at 15% 10%, rgba(167, 139, 250, 0.35), transparent 70%),
    radial-gradient(50% 45% at 85% 20%, rgba(244, 114, 182, 0.22), transparent 70%),
    radial-gradient(50% 50% at 50% 100%, rgba(124, 58, 237, 0.30), transparent 70%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
  filter: saturate(110%);
  animation: aurora-drift 22s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-2%, 1.5%, 0) scale(1.04); }
}

/* App shell */
.app-shell {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* Header */
.app-header { text-align: center; padding-top: 8px; }
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  margin-bottom: 8px;
}
.brand-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  color: white;
}
.brand-mark svg { width: 22px; height: 22px; }

#app-title {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--fg-1) 30%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle {
  color: var(--fg-3);
  font-size: 15px;
  font-weight: 500;
}

/* Composer */
.composer { width: 100%; }
.composer-row {
  display: flex;
  gap: 10px;
  padding: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: border-color var(--duration-fast) var(--easing);
}
.composer-row:focus-within {
  border-color: rgba(167, 139, 250, 0.5);
  box-shadow: 0 0 0 4px rgba(167, 139, 250, 0.12);
}
#todo-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--fg-1);
  font: inherit;
  font-size: 16px;
  padding: 12px 14px;
}
#todo-input::placeholder { color: var(--fg-4); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform var(--duration-fast) var(--easing),
    background var(--duration-fast) var(--easing),
    box-shadow var(--duration-fast) var(--easing);
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
  box-shadow: var(--shadow-2);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-3); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  color: var(--fg-3);
  background: transparent;
  border-color: var(--border-2);
  font-size: 13px;
  padding: 8px 14px;
}
.btn-ghost:hover {
  color: var(--fg-1);
  background: var(--bg-card-hover);
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.filters {
  display: inline-flex;
  padding: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-full);
}
.filter {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--fg-3);
  cursor: pointer;
  transition: color var(--duration-fast) var(--easing), background var(--duration-fast) var(--easing);
}
.filter:hover { color: var(--fg-1); }
.filter.is-active {
  color: white;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.35);
}
.counts {
  font-size: 13px;
  color: var(--fg-3);
  font-weight: 500;
}

/* List */
.list-wrapper { position: relative; min-height: 120px; }
.todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.todo-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  animation: pop-in var(--duration-normal) var(--easing);
  transition: background var(--duration-fast) var(--easing), border-color var(--duration-fast) var(--easing);
}
.todo-item:hover { background: var(--bg-card-hover); border-color: var(--border-2); }
.todo-item.is-leaving {
  animation: fade-out 0.25s var(--easing) forwards;
}

@keyframes pop-in {
  from { opacity: 0; transform: translateY(-6px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes fade-out {
  to { opacity: 0; transform: translateX(20px) scale(0.95); max-height: 0; padding-top: 0; padding-bottom: 0; margin: 0; }
}

.check {
  flex-shrink: 0;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  background: transparent;
  border: 2px solid var(--border-2);
  border-radius: 50%;
  color: transparent;
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing);
}
.check svg { width: 14px; height: 14px; }
.check:hover {
  border-color: var(--accent-1);
  background: rgba(167, 139, 250, 0.12);
}
.todo-item.is-done .check {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
  border-color: transparent;
  color: white;
}

.todo-content { flex: 1; min-width: 0; }
.todo-text {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg-1);
  word-wrap: break-word;
  transition: color var(--duration-fast) var(--easing), text-decoration var(--duration-fast) var(--easing);
}
.todo-item.is-done .todo-text {
  color: var(--fg-4);
  text-decoration: line-through;
  text-decoration-color: rgba(167, 139, 250, 0.5);
}
.todo-meta {
  display: block;
  font-size: 11px;
  color: var(--fg-4);
  margin-top: 3px;
  letter-spacing: 0.02em;
}

.delete {
  flex-shrink: 0;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--fg-4);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--duration-fast) var(--easing), color var(--duration-fast) var(--easing), background var(--duration-fast) var(--easing);
}
.todo-item:hover .delete { opacity: 1; }
.delete:hover { color: var(--danger); background: rgba(248, 113, 113, 0.12); }
.delete svg { width: 16px; height: 16px; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--fg-3);
  animation: pop-in var(--duration-normal) var(--easing);
}
.empty-mark {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  color: var(--accent-1);
}
.empty-mark svg { width: 28px; height: 28px; }
.empty-state h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg-1);
  margin-bottom: 6px;
}
.empty-state p { font-size: 14px; max-width: 320px; margin: 0 auto; }

/* Footer */
.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 8px;
  border-top: 1px solid var(--border-1);
}
.hint {
  font-size: 12px;
  color: var(--fg-4);
}

/* Responsive tweaks */
@media (max-width: 480px) {
  body { padding: 16px 14px; }
  .composer-row { flex-direction: column; }
  .btn-primary { justify-content: center; }
  .filter { padding: 8px 12px; }
}

/* Reduce motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .bg-aurora { animation: none; }
}