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

:root {
  --bg:           #0d0d0f;
  --surface:      #17171b;
  --surface-2:    #1f1f25;
  --border:       #2a2a33;
  --border-light: #35353f;

  --accent:       #f5c842;
  --accent-dim:   #f5c84222;
  --accent-glow:  #f5c84233;

  --text-1:  #ebebeb;
  --text-2:  #9898aa;
  --text-3:  #55555f;

  --done-color:   #44d9a0;
  --done-bg:      #44d9a011;
  --danger:       #ff5f5f;
  --danger-dim:   #ff5f5f18;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.3);

  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;

  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px 48px;
  overflow-x: hidden;
  position: relative;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #f5c842, transparent 70%);
  top: -150px; left: -150px;
  animation: orbFloat1 18s ease-in-out infinite;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #6c63ff, transparent 70%);
  bottom: -100px; right: -100px;
  animation: orbFloat2 22s ease-in-out infinite;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #44d9a0, transparent 70%);
  top: 50%; left: 60%;
  animation: orbFloat3 26s ease-in-out infinite;
  opacity: 0.10;
}

@keyframes orbFloat1 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.1); }
}
@keyframes orbFloat2 {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-30px, -40px) scale(1.08); }
}
@keyframes orbFloat3 {
  0%,100% { transform: translate(-50%,-50%) scale(1); }
  50% { transform: translate(-50%,-50%) scale(1.2); }
}

.container {
  width: 100%;
  max-width: 500px;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  animation: fadeDown 0.6s ease both;
}

.logo {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 8vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-1);
  line-height: 1;
  animation: fadeDown 0.7s ease both;
}
.logo span { color: var(--accent); }

.tagline {
  font-size: 14px;
  color: var(--text-2);
  font-weight: 300;
  max-width: 340px;
  animation: fadeDown 0.8s ease both;
}

/* ─── About Project Section ─── */
.about-project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: fadeUp 0.75s ease both;
  position: relative;
  overflow: hidden;
}

/* Subtle accent line on the left */
.about-project::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  border-radius: 0 2px 2px 0;
}

.about-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.about-badge {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  padding: 3px 10px;
  border-radius: 100px;
}

.about-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.01em;
}

.about-desc {
  font-size: 13.5px;
  font-weight: 300;
  color: var(--text-2);
  line-height: 1.65;
}

.about-desc strong {
  color: var(--text-1);
  font-weight: 500;
}

.about-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
  padding-top: 4px;
  border-top: 1px solid var(--border);
}

.about-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.about-meta-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-3);
}

.about-meta-value {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-1);
  line-height: 1.4;
}
/* ──────────────────────────────── */

.card {
  
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 35px 28px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 25px;
  animation: fadeUp 0.7s ease both;
}

.stats-bar {
  display: flex;
  gap: 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 8px;
  gap: 2px;
  position: relative;
}
.stat + .stat::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 1px;
  background: var(--border);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1;
  transition: color var(--transition);
}
.stat:first-child .stat-number { color: var(--accent); }
.stat:nth-child(2) .stat-number { color: var(--done-color); }

.stat-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}

.task-form {
  display: flex;
  gap: 10px;
}

.input-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-3);
  font-size: 14px;
  pointer-events: none;
  transition: color var(--transition);
}

.task-input {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-1);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 13px 14px 13px 38px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.task-input::placeholder { color: var(--text-3); }
.task-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.task-input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
  color: var(--accent);
}

.btn-add {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--accent);
  color: #0d0d0f;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 13px 18px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-add:hover {
  background: #ffd35a;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-add:active { transform: translateY(0); }

.btn-icon {
  font-size: 16px;
  line-height: 1;
}

.filters {
  display: flex;
  gap: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 5px;
}

.filter-btn {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 10px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.filter-btn:hover { color: var(--text-1); }
.filter-btn.active {
  background: var(--surface);
  color: var(--text-1);
  box-shadow: var(--shadow-sm);
}

.divider {
  height: 1px;
  background: var(--border);
  margin: -4px 0;
}

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: default;
  transition: border-color var(--transition), background var(--transition);
  animation: taskIn 0.3s cubic-bezier(0.34,1.56,0.64,1) both;
}
.task-item:hover {
  border-color: var(--border-light);
}
.task-item.removing {
  animation: taskOut 0.28s ease forwards;
}

.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  min-width: 20px;
  border: 2px solid var(--border-light);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.task-checkbox:hover { border-color: var(--accent); }
.task-checkbox:checked {
  background: var(--done-color);
  border-color: var(--done-color);
}
.task-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 5px; top: 2px;
  width: 6px; height: 10px;
  border: 2px solid #0d0d0f;
  border-top: none;
  border-left: none;
  transform: rotate(42deg);
}

.task-text {
  flex: 1;
  font-size: 14px;
  font-weight: 400;
  color: var(--text-1);
  word-break: break-word;
  transition: color var(--transition), text-decoration var(--transition);
}

.task-item.done {
  background: var(--done-bg);
  border-color: #44d9a022;
}
.task-item.done .task-text {
  color: var(--text-3);
  text-decoration: line-through;
  text-decoration-color: var(--text-3);
}

.task-remove {
  background: none;
  border: none;
  color: var(--text-3);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  line-height: 1;
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--transition), color var(--transition), background var(--transition);
}
.task-item:hover .task-remove { opacity: 1; }
.task-remove:hover {
  color: var(--danger);
  background: var(--danger-dim);
}

.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 32px 0 16px;
  text-align: center;
}
.empty-state.visible { display: flex; }

.empty-icon {
  font-size: 2.4rem;
  color: var(--text-3);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%,100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.08); }
}

.empty-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-2);
}
.empty-sub {
  font-size: 13px;
  color: var(--text-3);
}

.card-footer {
  display: none;
  justify-content: flex-end;
}
.card-footer.visible { display: flex; }

.btn-clear {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-3);
  font-family: var(--font-body);
  font-size: 12px;
  padding: 7px 14px;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.btn-clear:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-dim);
}

.page-footer {
  text-align: center;
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes taskIn {
  from { opacity: 0; transform: translateY(-10px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes taskOut {
  from { opacity: 1; transform: scale(1); max-height: 80px; margin-bottom: 8px; }
  to   { opacity: 0; transform: scale(0.95); max-height: 0; margin-bottom: 0; padding: 0; overflow: hidden; }
}

@media (max-width: 480px) {
  body { padding: 16px 12px 40px; }
  .card { padding: 20px 16px; gap: 16px; }

  .task-form { flex-direction: column; }
  .btn-add { justify-content: center; }

  .stat-number { font-size: 1.35rem; }

  .task-remove { opacity: 1; }

  /* About section: stack meta to single column on mobile */
  .about-project { padding: 18px 18px 18px 22px; }
  .about-meta { grid-template-columns: 1fr; gap: 8px; }
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

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