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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: rgba(255, 255, 255, 0.04);
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-input: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(139, 92, 246, 0.5);
  --text-primary: #f1f1f4;
  --text-secondary: #8b8b9e;
  --text-muted: #55556a;
  --accent: #8b5cf6;
  --accent-glow: rgba(139, 92, 246, 0.25);
  --high: #f43f5e;
  --high-bg: rgba(244, 63, 94, 0.12);
  --medium: #f59e0b;
  --medium-bg: rgba(245, 158, 11, 0.12);
  --low: #10b981;
  --low-bg: rgba(16, 185, 129, 0.12);
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 14px;
  --radius-sm: 10px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 60px 20px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Ambient background glow ── */
.ambient-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── Container ── */
.container {
  position: relative;
  z-index: 1;
  background: var(--bg-card);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  border: 1px solid var(--border);
  padding: 36px;
  border-radius: 20px;
  width: 100%;
  max-width: 480px;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.03),
    0 20px 60px rgba(0, 0, 0, 0.4),
    0 0 80px rgba(139, 92, 246, 0.05);
}

/* ── Header ── */
.header {
  text-align: center;
  margin-bottom: 32px;
}

.header-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  color: white;
  margin-bottom: 16px;
  box-shadow: 0 8px 24px var(--accent-glow);
}

h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 400;
}

/* ── Form ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

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

#task-input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 15px;
  outline: none;
  transition: var(--transition);
}

#task-input::placeholder {
  color: var(--text-muted);
}

#task-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: rgba(255, 255, 255, 0.08);
}

#priority-select {
  flex: 1;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%238b8b9e' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

#priority-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

#priority-select option {
  background: #1a1a2e;
  color: var(--text-primary);
}

#submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: var(--transition);
  box-shadow: 0 4px 16px var(--accent-glow);
}

#submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(139, 92, 246, 0.35);
}

#submit-btn:active {
  transform: translateY(0);
}

.btn-icon {
  flex-shrink: 0;
}

/* ── Task Stats ── */
.task-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.task-stats:empty {
  display: none;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

/* ── Task List ── */
ul {
  list-style: none;
  padding: 0;
}

li {
  background: var(--bg-secondary);
  margin-bottom: 8px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  animation: slideIn 0.3s ease-out;
  position: relative;
  overflow: hidden;
}

li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  transition: var(--transition);
}

li:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

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

@keyframes slideOut {
  to {
    opacity: 0;
    transform: translateX(20px);
    height: 0;
    padding: 0;
    margin: 0;
    border-width: 0;
  }
}

/* Priority-based accent bars */
li[data-priority="high"]::before { background: var(--high); }
li[data-priority="medium"]::before { background: var(--medium); }
li[data-priority="low"]::before { background: var(--low); }

li[data-priority="high"] { background: var(--high-bg); border-color: rgba(244, 63, 94, 0.15); }
li[data-priority="medium"] { background: var(--medium-bg); border-color: rgba(245, 158, 11, 0.15); }
li[data-priority="low"] { background: var(--low-bg); border-color: rgba(16, 185, 129, 0.15); }

/* ── Task Layout ── */
.task-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 12px;
}

.task-info {
  display: flex;
  align-items: center;
  flex: 1;
  overflow: hidden;
  gap: 10px;
}

.task-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  font-size: 14px;
  font-weight: 450;
  color: var(--text-primary);
}

/* ── Priority Label ── */
.priority-label {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}

li[data-priority="high"] .priority-label {
  background: rgba(244, 63, 94, 0.2);
  color: #fb7185;
}

li[data-priority="medium"] .priority-label {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}

li[data-priority="low"] .priority-label {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

/* ── Task Buttons ── */
.task-buttons {
  display: flex;
  gap: 4px;
  opacity: 0.5;
  transition: var(--transition);
}

li:hover .task-buttons {
  opacity: 1;
}

.task-buttons button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
  background: transparent;
  color: var(--text-secondary);
}

.complete-btn:hover {
  background: rgba(34, 197, 94, 0.15) !important;
  border-color: rgba(34, 197, 94, 0.3) !important;
  color: var(--success) !important;
}

.edit-btn:hover {
  background: rgba(245, 158, 11, 0.15) !important;
  border-color: rgba(245, 158, 11, 0.3) !important;
  color: var(--medium) !important;
}

.delete-btn:hover {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
  color: var(--danger) !important;
}

/* ── Completed State ── */
li.completed {
  opacity: 0.5;
}

li.completed .task-text {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* ── Empty State ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
  color: var(--text-muted);
  text-align: center;
}

.empty-state p {
  font-size: 15px;
  font-weight: 500;
  margin-top: 16px;
  color: var(--text-secondary);
}

.empty-state span {
  font-size: 13px;
  margin-top: 4px;
}

.empty-state.hidden {
  display: none;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ── Responsive ── */
@media (max-width: 520px) {
  .container {
    padding: 24px 20px;
    border-radius: 16px;
  }

  .form-row {
    flex-direction: column;
  }

  #submit-btn {
    justify-content: center;
  }
}