:root {
  --bg-1: #ffecd2;
  --bg-2: #fcb69f;
  --card: rgba(255, 255, 255, 0.9);
  --accent: #ff6b6b;
  --muted: #6b6b6b;
  --glass: rgba(255, 255, 255, 0.7);
  --shadow: 0 8px 24px rgba(15, 15, 15, 0.12);
  /* responsive helpers */
  --container-max: 1100px;
  --app-padding: 28px;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  /* Use Nunito from Google Fonts (loaded in index.html) for a friendly tone */
  font-family: "Nunito", Inter, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
}
.app {
  width: 100%;
  max-width: var(--container-max);
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.85),
    rgba(255, 255, 255, 0.8)
  );
  border-radius: 18px;
  padding: var(--app-padding);
  box-shadow: var(--shadow);
  position: relative;
  /* layout: fix header/input/footer and make only the list scroll */
  display: flex;
  flex-direction: column;
  align-items: stretch;
  max-height: 90vh;
  overflow: hidden; /* keep scrolling inside .task-list */
}
.app::before {
  content: "";
  position: absolute;
  right: -120px;
  top: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255, 107, 107, 0.18),
    transparent 40%
  );
  transform: rotate(18deg);
  /* decorative layer must not intercept pointer events */
  pointer-events: none;
}
.app-header {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
  flex: 0 0 auto;
}
.logo {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  /* gentle float animation */
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px) rotate(-1deg);
  }
  100% {
    transform: translateY(0);
  }
}

/* add button temporary pop state (applied by JS) */
.btn.pop {
  transform: scale(0.96);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}
.app-header h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  letter-spacing: 0.6px;
}
.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}
.new-task {
  display: flex;
  gap: 10px;
  margin: 18px 0;
  align-items: center;
  flex: 0 0 auto;
}
#task-input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  background: var(--glass);
  font-size: 1rem;
  outline: none;
  transition: box-shadow 150ms ease;
}
#task-input:focus {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}
.btn {
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  position: relative;
  z-index: 2;
}
.btn.primary {
  /* Match delete button style, but use red for positive action */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 40px;
  padding: 8px 14px;
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(90deg, #ff3b30, #e02424);
  border: 0;
  box-shadow: 0 10px 24px rgba(255, 59, 59, 0.18), 0 2px 6px rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  transition: transform 160ms cubic-bezier(0.2, 0.9, 0.3, 1),
    box-shadow 160ms ease;
}
.btn.primary:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 16px 34px rgba(255, 59, 59, 0.22);
}
.btn.primary:active {
  transform: translateY(0) scale(0.98);
}
.btn.primary:focus {
  outline: 3px solid rgba(255, 59, 59, 0.22);
  outline-offset: 3px;
}
/* subtle clear-completed button */
.btn.clear {
  padding: 8px 12px;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: background 140ms ease, color 140ms ease, transform 140ms ease;
}
.btn.clear:hover {
  background: rgba(255, 90, 90, 0.08);
  color: #d64545;
  transform: translateY(-2px);
}
.btn.clear:focus {
  outline: 3px solid rgba(214, 69, 69, 0.12);
  outline-offset: 3px;
}
.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex: 0 0 auto;
}
.filters {
  display: flex;
  gap: 8px;
}
.filter {
  padding: 8px 10px;
  border-radius: 10px;
  background: transparent;
}
.filter.active {
  background: rgba(0, 0, 0, 0.06);
}
.filter .count {
  margin-left: 6px;
  color: var(--muted);
  font-weight: 700;
}
.stats {
  color: var(--muted);
  font-weight: 600;
}
.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
  /* allow the list to scroll when it grows so header remains visible */
  flex: 1 1 auto;
  min-height: 0; /* allow proper flex child scrolling */
  overflow: auto;
  padding-right: 8px; /* space for scrollbar */
}

/* nicer small scrollbars (optional) */
.task-list::-webkit-scrollbar {
  width: 10px;
}
.task-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 6px;
}
.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.95),
    rgba(255, 255, 255, 0.92)
  );
  border-radius: 12px;
  box-shadow: 0 6px 12px rgba(12, 12, 12, 0.04);
  transition: transform 180ms ease, opacity 180ms ease;
}
.task-item .text {
  flex: 1;
}
.task-item.done {
  /* Completed tasks: muted, subtle tint and clear strike-through */
  opacity: 1;
  background: linear-gradient(
    180deg,
    rgba(230, 245, 235, 0.8),
    rgba(245, 250, 245, 0.6)
  );
  border-left: 4px solid rgba(36, 176, 36, 0.16);
}
.task-item.done .text {
  text-decoration: line-through;
  color: var(--muted);
  font-weight: 600;
}
.task-actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}
.icon-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
}
.icon-btn.delete {
  /* Bold, highly-visible delete button for clarity and accessibility */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 40px;
  padding: 8px 14px;
  font-size: 26px;
  font-weight: 800;
  color: #fff;
  /* strong red gradient for clear delete affordance */
  background: linear-gradient(90deg, #ff3b30, #e02424);
  border: 0;
  box-shadow: 0 10px 24px rgba(255, 59, 59, 0.18), 0 2px 6px rgba(0, 0, 0, 0.06);
  border-radius: 12px;
  transition: transform 160ms cubic-bezier(0.2, 0.9, 0.3, 1),
    box-shadow 160ms ease;
}
.icon-btn.delete:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 16px 34px rgba(255, 59, 59, 0.22);
}
.icon-btn.delete:active {
  transform: translateY(0) scale(0.98);
}
.icon-btn.delete:focus {
  outline: 3px solid rgba(255, 107, 107, 0.22);
  outline-offset: 3px;
}
.check {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid rgba(0, 0, 0, 0.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.new-pulse {
  animation: pop 260ms cubic-bezier(0.2, 0.9, 0.3, 1);
}
@keyframes pop {
  0% {
    transform: scale(0.96);
    opacity: 0;
  }
  80% {
    transform: scale(1.02);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
.app-footer {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  flex: 0 0 auto;
}

/* responsive rules */
@media (max-width: 900px) {
  :root {
    --app-padding: 20px;
  }
  .app {
    padding: var(--app-padding);
  }
  .logo {
    width: 56px;
    height: 56px;
  }
  .task-item {
    padding: 10px;
  }
  #task-input {
    padding: 10px;
  }
  .btn.primary,
  .icon-btn.delete {
    height: 36px;
    min-width: 40px;
    font-size: 16px;
  }
}

@media (max-width: 520px) {
  .app {
    padding: 14px;
  }
  .logo {
    width: 48px;
    height: 48px;
  }
  /* stack add controls on narrow screens */
  .new-task {
    flex-direction: column;
    align-items: stretch;
  }
  #task-input {
    width: 100%;
  }
  #add-btn {
    width: 100%;
    margin-top: 8px;
  }
  .filters {
    overflow-x: auto;
    gap: 6px;
  }
  .task-actions {
    margin-left: 0;
    gap: 10px;
  }
  .task-item {
    flex-direction: row;
    align-items: center;
  }
}

@media (max-width: 380px) {
  :root {
    --app-padding: 12px;
  }
  .app {
    padding: 12px;
  }
  .app-header h1 {
    font-size: 1.1rem;
  }
  .task-item {
    padding: 10px;
  }
  .btn.primary,
  .icon-btn.delete {
    font-size: 15px;
    height: 36px;
  }
}