:root {
  --bg-primary: #0b0f19;
  --bg-card: rgba(18, 24, 38, 0.85);
  --border-color: rgba(255, 255, 255, 0.1);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --cyan: #00f2fe;
  --blue: #2563eb;
  --green: #10b981;
  --amber: #f59e0b;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  padding: 30px 16px;
  display: flex;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 640px;
}

.header {
  margin-bottom: 24px;
  text-align: center;
}

.brand {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(135deg, #00f2fe, #4facfe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
}

.card-title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--cyan);
  margin-bottom: 14px;
}

.control-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.control-label {
  font-size: 13px;
  color: var(--text-muted);
}

select {
  background: #1e293b;
  border: 1px solid var(--border-color);
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  outline: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 600;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.badge-synchronized {
  background: rgba(16, 185, 129, 0.15);
  color: var(--green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}
.badge-synchronized .badge-dot { background: var(--green); box-shadow: 0 0 8px var(--green); }

.badge-buffered {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}
.badge-buffered .badge-dot { background: var(--amber); }

.badge-syncing {
  background: rgba(0, 242, 254, 0.15);
  color: var(--cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}
.badge-syncing .badge-dot { background: var(--cyan); }

.meta-stats {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 10px;
  margin-top: 10px;
}

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

input[type="text"] {
  flex: 1;
  background: #1e293b;
  border: 1px solid var(--border-color);
  color: white;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
}
input[type="text"]:focus {
  outline: none;
  border-color: var(--cyan);
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe, #2563eb);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.9; }

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

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
}

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

.task-actions {
  display: flex;
  gap: 8px;
}

.btn-toggle, .btn-delete {
  background: #334155;
  color: white;
  border: none;
  padding: 5px 10px;
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
}
.btn-delete { background: #ef4444; }

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
  font-size: 13px;
}